CN104009818B - Method, system and node device for establishing wavelength cross connection - Google Patents

Abstract

The present invention relates to the field of network communication, and specifically discloses a method for establishing a wavelength cross-connection, including: a first node determines the spectral bandwidth of each segment connection on the wavelength connection, and obtains the second spectral bandwidth according to the spectral bandwidth of the segment connection where the first node is located. The fifth available central frequency set of five links; sending a request message carrying the fifth available central frequency set information and the spectrum bandwidth information to the adjacent node in the direction from the first node to the second node; The first node receives the response message, extracts the first center frequency information carried in the response message, obtains the center frequency of the segment connection where the first node is located, and based on the center frequency and frequency spectrum of the segment connection where the first node is located A wavelength cross-connect is established for a spectrum range determined by bandwidth. The embodiment of the invention also discloses a node device and system for establishing wavelength cross-connection.

Description

Method and system for establishing wavelength cross-connection, and node device

technical field

The invention relates to network communication technology, in particular to a method, system and node equipment for establishing wavelength cross-connection.

Background technique

The wavelength connections in the WDM network are carried by optical fiber links, and each wavelength connection needs to occupy a certain amount of optical fiber spectrum resources. Usually, available spectrum resources in an optical fiber are divided into fixed spectrum intervals, each spectrum interval is used as a wavelength channel to carry a wavelength connection, and the bandwidth of the wavelength connections carried in the same optical fiber is the same. As a result, when services with different bandwidth requirements are transmitted using mixed wavelength connections, it is necessary to divide the spectrum resources of the optical fiber into wavelength channels according to the services with the largest bandwidth requirements, while other services with smaller bandwidth requirements do not require such large bandwidth wavelengths. The channel wastes the spectrum resource of the optical fiber and reduces the utilization rate of the spectrum resource of the optical fiber.

In order to improve the utilization of spectrum resources in the WDM network, spectrum intervals can be flexibly divided according to service requirements, that is, the spectrum bandwidths occupied by wavelength connections carried in the same optical fiber can be different.

At present, the establishment of wavelength cross-connection with variable spectral bandwidth needs to be completed manually through the network management on the node, which is complex and has low reliability.

Contents of the invention

Embodiments of the present invention provide a method, system and node device for establishing wavelength cross-connection, which solve the problems of complex implementation and low reliability in the prior art.

Embodiments of the invention adopt the following technical solutions:

One aspect of the present invention provides a method for establishing a wavelength cross-connect, including:

The first node determines the spectral bandwidth of each segment connection on the wavelength connection, and obtains the fifth available center frequency set of the fifth link according to the spectral bandwidth of the segment connection where the first node is located; the fifth link is the first node. a link between a node and an adjacent node in the direction from the first node to the second node;

Obtain the fifth available central frequency set information corresponding to the fifth available central frequency set and the spectral bandwidth information corresponding to the spectral bandwidth of each segment connection on the wavelength connection, and send the direction from the first node to the second node sending a request message carrying the information about the fifth set of available central frequencies and the information about the spectrum bandwidth;

The first node receives the response message, extracts the first center frequency information carried in the response message, obtains the center frequency of the segment connection where the first node is located, and based on the center frequency of the segment connection where the first node is located and Establish wavelength cross-connection in the spectrum range determined by the spectrum bandwidth;

The center frequency is an available center frequency obtained by the fourth node between the first node and the second node in the sixth available center frequency set; the sixth available center frequency set is the first node The intersection of the set of available center frequencies of all links through which the segment is connected.

Another aspect of the present invention provides a method for establishing a wavelength cross-connect, including:

The second node receives the request message, extracts the ninth available central frequency set information and spectrum bandwidth information carried in the request message, and obtains the ninth available central frequency set and the segment connection information of the second node determined by the first node Spectrum bandwidth; the ninth available central frequency set is the intersection of available central frequency sets of all links through which the segment where the second node is located is connected;

The second node acquires an available center frequency from the ninth set of available center frequencies as the center frequency of the segment connection where the second node is located, determined based on the center frequency and spectrum bandwidth of the segment connection where the second node is located spectrum range to establish wavelength cross-connects.

Another aspect of the present invention provides a method for establishing a wavelength cross-connect, including:

The fourth node receives the request message, extracts the sixth available central frequency set information and the first spectrum bandwidth information carried in the request message, obtains the sixth available central frequency set, and obtains the location of the fourth node determined by the first node. The first node side segment connection and the spectrum bandwidth of each segment connection between the fourth node and the second node; the sixth available center frequency set is the first node side segment connection where the fourth node is located the intersection of the sets of available center frequencies of all links traversed;

The fourth node acquires an available center frequency from the sixth set of available center frequencies as the center frequency of the side section connection of the first node where the fourth node is located;

The fourth node obtains the seventh available center frequency set of the sixth link according to the spectral bandwidth of the side section connection of the second node where the fourth node is located; the sixth link is the fourth node and Links between adjacent nodes in the direction from the first node to the second node;

Obtain the seventh available central frequency set information corresponding to the seventh available central frequency set, obtain the second spectral bandwidth information corresponding to the spectral bandwidth of each segment connection between the fourth node and the second node, and send to the sending a request message carrying information about the seventh available central frequency set and information about the second spectrum bandwidth from the first node to the adjacent node in the direction of the second node;

The fourth node receives the response message, extracts the second center frequency information carried in the response message, and obtains the center frequency of the side section connection of the second node where the fourth node is located, based on the fourth node determining the first spectrum range based on the center frequency and spectrum bandwidth of the side-section connection of the first node where the fourth node is located, and determining the second spectrum range based on the center frequency and spectrum bandwidth of the side-section connection of the second node where the fourth node is located, establishing a wavelength cross-connection between the first spectral range and the second spectral range;

The center frequency of the side section connection of the second node where the fourth node is located is an available center frequency in the eighth available center frequency set; the eighth available center frequency set is the The intersection of the set of available center frequencies of all the links through which the side section of the second node is connected.

Another aspect of the present invention provides a method for establishing a wavelength cross-connect, including:

The third node receives the request message, extracts the tenth available central frequency set information and spectrum bandwidth information carried in the request message, obtains the tenth available central frequency set, and obtains the segment connection of the third node determined by the first node Spectrum bandwidth connected to each segment between the third node and the second node; the tenth available center frequency set is the first node or the fourth node connected to the segment where the third node is connected to the intersection of the sets of available center frequencies of all links between the third nodes;

The third node obtains the set of available center frequencies of the seventh link according to the spectrum bandwidth of the segment connection where the third node is located; and the set of available center frequencies of the seventh link and the set of available center frequencies of the tenth link Intersection, obtaining the eleventh available center frequency set, obtaining the eleventh available center frequency set information corresponding to the eleventh available center frequency set; the seventh link is the third node and the first node Links between adjacent nodes in the direction to the second node;

The third node sends a request message carrying the eleventh available central frequency set information and the spectrum bandwidth information to adjacent nodes in the direction from the first node to the second node;

The third node receives the response message, extracts the third center frequency information carried in the response message, and obtains the center frequency of the segment connection where the third node is located, based on the center frequency of the segment connection where the third node is located and Establish wavelength cross-connection in the spectrum range determined by the spectrum bandwidth;

The center frequency is an available center frequency acquired by the fourth node between the third node and the second node or the second node in the eleventh available center frequency set; the eleventh available center frequency The frequency set is an intersection set of available center frequency sets of all links through which the segment connection of the third node is located.

Another aspect of the present invention provides a method for establishing a wavelength cross-connect, including:

The first node determines the spectral bandwidth of each segment connection on the wavelength connection, obtains the fifth idle center frequency set information corresponding to the fifth idle center frequency set of the eighth link and corresponds to the spectrum bandwidth of each segment connection on the wavelength connection spectrum bandwidth information, and send a request message carrying the fifth free center frequency set information and the spectrum bandwidth information to the adjacent nodes in the direction from the first node to the second node; the eighth link is the Links between the first node and adjacent nodes in the direction from the first node to the second node;

The first node receives the response message, extracts the fifth center frequency information carried in the response message, and obtains the center frequency of the segment connection where the first node is located, based on the center frequency of the segment connection where the first node is located and Establish wavelength cross-connection in the spectrum range determined by the spectrum bandwidth;

The center frequency is an available center frequency obtained from the sixth free center frequency set by the fourth node between the first node and the second node according to the spectral bandwidth of the segment connection where the first node is located; The six free center frequency sets are the intersection of the free center frequency sets of all the links through which the segment connection of the first node is located.

Another aspect of the present invention provides a method for establishing a wavelength cross-connect, including:

The second node receives the request message, extracts the ninth idle central frequency set information and spectrum bandwidth information carried in the request message, obtains the ninth idle central frequency set, and obtains the segment connection of the second node determined by the first node Spectrum bandwidth; the ninth free central frequency set is the intersection of free central frequency sets of all links through which the second node is connected;

The second node obtains an available center frequency from the ninth free center frequency set according to the spectrum bandwidth of the segment connection where the second node is located, as the center frequency of the segment connection where the second node is located, based on the first The wavelength cross-connection is established in the spectral range determined by the central frequency and the spectral bandwidth of the segment connection where the two nodes are located.

Another aspect of the present invention provides a method for establishing a wavelength cross-connect, including:

The fourth node receives the request message, extracts the sixth idle center frequency set information and the third spectrum bandwidth information carried in the request message, obtains the sixth idle center frequency set, and obtains the first node side where the fourth node is located The segment connection and the spectrum bandwidth of each segment connection between the fourth node and the second node; the sixth idle central frequency set is all links through which the segment connection on the side of the first node where the fourth node is located The intersection of the free center frequency sets of ;

The fourth node obtains an available center frequency from the sixth free center frequency set according to the spectrum bandwidth of the side section connection of the first node where the fourth node is located, as the the center frequency of the side section connection of the first node;

The fourth node obtains the seventh free center frequency set information corresponding to the seventh free center frequency set of the ninth link; obtains the information corresponding to the spectrum bandwidth of each segment connection between the fourth node and the second node. Four spectral bandwidth information, sending a request message carrying information about the seventh free center frequency set and the fourth spectral bandwidth information to adjacent nodes in the direction from the first node to the second node; the ninth link is the a link between the fourth node and the adjacent node in the direction from the first node to the second node;

The fourth node receives the response message, extracts the sixth center frequency information carried in the response message, and obtains the center frequency of the side connection of the second node where the fourth node is located, based on the fourth node The center frequency and spectrum bandwidth of the side section connection of the first node where the location is located determine a third spectrum range, and the fourth spectrum range is determined based on the center frequency and spectrum bandwidth of the side section connection of the second node where the fourth node is located , establishing a wavelength cross-connection between the third spectrum range and the fourth spectrum range;

The center frequency of the side section connection of the second node where the fourth node is located is an available center frequency in the eighth free center frequency set; the eighth free center frequency set is the center frequency of the second node where the fourth node is located The intersection of the free center frequency sets of all the links through which the side section of the second node is connected.

Another aspect of the present invention provides a method for establishing a wavelength cross-connect, including:

The third node receives the request message, extracts the tenth idle center frequency set information and spectrum bandwidth information carried in the request message, obtains the tenth idle center frequency set, and obtains the segment connection where the third node is determined by the first node Spectrum bandwidth connected to each segment between the third node and the second node; the tenth idle central frequency set is the first node or the fourth node connected to the segment connected by the third node to the an intersection of sets of free center frequencies of all links between the third nodes;

The third node intersects the idle center frequency set of the tenth link with the tenth idle center frequency set to obtain an eleventh idle center frequency set, and obtains the tenth idle center frequency set corresponding to the eleventh idle center frequency set. A free central frequency set information; the tenth link is a link between the third node and the adjacent node in the direction from the first node to the second node;

The third node sends to the adjacent nodes in the direction from the first node to the second node, carrying the eleventh free center frequency set information and the segment connection where the third node is located and the link between the third node and the second node. A request message for spectrum bandwidth information of each segment connection between nodes;

The third node receives the response message, extracts the center frequency information carried in the response message, and obtains the center frequency of the segment connection where the third node is located, based on the center frequency and spectrum bandwidth of the segment connection where the third node is located Establish wavelength cross-connection in the determined spectrum range;

The center frequency is obtained by the fourth node between the third node and the second node or by the second node in the eleventh free center frequency set according to the spectrum bandwidth of the connection in the segment where the third node is located An available center frequency; the eleventh idle center frequency set is an intersection set of idle center frequency sets of all links through which the segment connection of the third node is located.

One aspect of the present invention provides a node device, including:

The first processing module is configured to determine the spectral bandwidth of each segment connection on the wavelength connection, and obtain the fifth available center frequency set of the fifth link according to the spectral bandwidth of the segment connection where the node is located; the fifth link is the node The link between the adjacent nodes in the direction from the current node to the second node; it is also used to obtain the fifth available central frequency set information corresponding to the fifth available central frequency set and the spectrum of each segment connection on the wavelength connection Spectrum bandwidth information corresponding to the bandwidth;

The first sending module is configured to send a request message carrying the fifth available central frequency set information and the spectrum bandwidth information to the adjacent node in the direction from the current node to the second node; and is also used to obtain the segment where the current node is located The center frequency of the connection; the center frequency is an available center frequency obtained by the fourth node between the node and the second node in the sixth set of available center frequencies; the sixth set of available center frequencies is where the node is located the intersection of the set of available center frequencies of all links via which the segment is connected;

A first receiving module, configured to receive a response message, and extract the first center frequency information carried in the response message;

The first cross-connection establishment module is configured to establish a wavelength cross-connection based on a spectrum range determined by the center frequency of the section connection where the node is located and the spectrum bandwidth.

Another aspect of the present invention provides a node device, including:

The second receiving module is configured to receive the request message, and extract the ninth available central frequency set information and spectrum bandwidth information carried in the request message;

The second processing module is used to obtain the ninth set of available center frequencies and the spectrum bandwidth of the section connection where the node is located determined by the first node; the ninth set of available center frequencies is available for all links via which the section connection of the node is located The intersection of the center frequency sets; it is also used to obtain an available center frequency in the ninth available center frequency set as the center frequency of the segment connection where the node is located;

The second cross-connection establishment module is configured to establish a wavelength cross-connection based on a spectrum range determined by the center frequency of the segment connection where the node is located and the spectrum bandwidth.

Another aspect of the present invention provides a node device, including:

The fourth receiving module is configured to receive a request message, and extract the sixth available center frequency set information and the first spectrum bandwidth information carried in the request message; it is also used to receive a response message, and extract the second spectrum bandwidth information carried in the response message. center frequency information;

The fourth processing module is used to obtain the sixth set of available center frequencies, to obtain the side segment connection of the first node where the current node is located and the spectrum bandwidth of each segment connection between the current node and the second node determined by the first node; The set of six available center frequencies is the intersection of the sets of available center frequencies of all the links through which the side section of the first node where the node is located; it is also used to obtain an available center frequency in the sixth set of available center frequencies, As the center frequency of the side-section connection of the first node where the node is located; it is also used to obtain the seventh available center frequency set of the sixth link according to the spectrum bandwidth of the side-section connection of the second node where the node is located; The sixth link is a link between the node and the adjacent node in the direction from the first node to the second node; obtain the seventh available center frequency set information corresponding to the seventh available center frequency set, and obtain the node To the second spectrum bandwidth information corresponding to the spectrum bandwidth of each segment connection between the second nodes; it is also used to obtain the center frequency of the side segment connection of the second node where the node is located; the second node where the node is located The center frequency of the node side section connection is an available center frequency in the eighth available center frequency set; the eighth available center frequency set is the available center of all links through which the second node side section connection of the node is located intersection of frequency sets;

A fourth sending module, configured to send a request message carrying the seventh available central frequency set information and the second spectrum bandwidth information to adjacent nodes in the direction from the first node to the second node;

The fourth cross establishment module is configured to determine the first spectrum range based on the center frequency and spectrum bandwidth of the side-section connection of the first node where the node is located, and determine the first spectrum range based on the center frequency and the spectrum bandwidth of the side-section connection of the second node where the node is located. The spectrum bandwidth determines a second spectrum range, and a wavelength cross-connection is established between the first spectrum range and the second spectrum range.

Another aspect of the present invention provides a node device, including:

The third receiving module is configured to receive a request message, and extract the tenth available center frequency set information and spectrum bandwidth information carried in the request message; it is also used to receive a response message, and extract the third center frequency carried in the response message information;

The third processing module is used to obtain the tenth available central frequency set, and obtain the segment connection where the node is located and the spectrum bandwidth of each segment connection between the current node and the second node determined by the first node; the tenth available central frequency set It is the intersection of the available central frequency sets of all the links between the first node or the fourth node and the node through which the segment of the node is connected; it is also used to obtain the seventh link according to the spectrum bandwidth of the connection of the segment where the node is located The available center frequency set of the seventh link is intersected with the tenth available center frequency set to obtain the eleventh available center frequency set, and the corresponding eleventh available center frequency set is obtained. The eleventh available center frequency set information; the seventh link is the link between the node and the adjacent node in the direction from the first node to the second node; it is also used to obtain the center of the segment connection where the node is located frequency; the center frequency is an available center frequency obtained by the fourth node between the node and the second node or the second node in the eleventh available center frequency set; the eleventh available center frequency The set is the intersection of the available center frequency sets of all links connected to the segment where the node is located;

A third sending module, configured to send a request message carrying the eleventh available central frequency set information and the spectrum bandwidth information to adjacent nodes in the direction from the first node to the second node;

The third cross-connection establishment module is configured to establish a wavelength cross-connection based on a spectrum range determined by the center frequency of the section connection where the node is located and the spectrum bandwidth.

Another aspect of the present invention provides a node device, including:

The first processing module is configured to determine the spectral bandwidth of each segment connection on the wavelength connection, and obtain the fifth idle center frequency set information corresponding to the fifth idle center frequency set of the eighth link and each segment connection on the wavelength connection Spectrum bandwidth information corresponding to the spectrum bandwidth; the eighth link is the link between the node and the adjacent node in the direction from the node to the second node; it is also used to obtain the center frequency of the segment connection where the node is located; the The center frequency is an available center frequency obtained by the fourth node between the node and the second node in the sixth set of free center frequencies according to the spectral bandwidth of the section where the node is connected; the set of sixth idle center frequencies is the node The intersection of the free center frequency sets of all the links through which the segment is connected;

The first sending module is configured to send a request message carrying the fifth free central frequency set information and the spectrum bandwidth information to the adjacent node in the direction from the current node to the second node;

A first receiving module, configured to receive a response message, and extract the fifth center frequency information carried in the response message;

The first cross-connection establishment module is configured to establish a wavelength cross-connection based on a spectrum range determined by the center frequency of the section connection where the node is located and the spectrum bandwidth.

Another aspect of the present invention provides a node device, including:

The second receiving module is configured to receive a request message, and extract the ninth idle center frequency set information and spectrum bandwidth information carried in the request message;

The second processing module is configured to obtain the ninth set of free central frequencies, and obtain the spectrum bandwidth of the section connection where the node is located as determined by the first node; the ninth set of free central frequencies is all the links through which the section connection where the node is located passes. The intersection of free center frequency sets; it is also used to obtain an available center frequency in the ninth free center frequency set according to the spectral bandwidth of the segment connection where the node is located, as the center frequency of the segment connection where the node is located;

The second cross-connection establishment module is configured to establish a wavelength cross-connection based on a spectrum range determined by the center frequency of the segment connection where the node is located and the spectrum bandwidth.

Another aspect of the present invention provides a node device, including:

The fourth receiving module is configured to receive a request message, and extract the sixth idle center frequency set information and the third spectrum bandwidth information carried in the request message; it is also used to receive a response message, and extract the sixth frequency information carried in the response message. center frequency information;

The fourth processing module is configured to obtain a sixth free central frequency set, and obtain the spectral bandwidth of the side segment connection of the first node where the node is located and each segment connection between the current node and the second node; the sixth free central frequency set It is the intersection of the free center frequency sets of all links through which the side section connection of the first node where the node is located; it is also used in the sixth Obtain an available center frequency from the free center frequency set as the center frequency of the side section connection of the first node where the node is located; and also obtain the seventh free center frequency corresponding to the seventh free center frequency set of the ninth link Aggregate information to obtain fourth spectrum bandwidth information corresponding to the spectrum bandwidth of each segment connection between the node and the second node; the ninth link is the connection between the node and the direction from the first node to the second node A link between adjacent nodes; it is also used to obtain the center frequency of the side section connection of the second node where the node is located; the center frequency of the side section connection of the second node where the node is located is the eighth free center frequency set An available center frequency; the eighth free center frequency set is the intersection of the free center frequency sets of all links through which the second node side section connection of the node is located;

A fourth sending module, configured to send a request message carrying information about the seventh free center frequency set and the fourth spectrum bandwidth information to adjacent nodes in the direction from the first node to the second node;

The fourth cross establishment module is configured to determine the third spectrum range based on the center frequency and spectrum bandwidth of the side section connection of the first node where the node is located, and determine the third spectrum range based on the center frequency and the frequency spectrum bandwidth of the side section connection of the second node where the node is located. A fourth spectrum range determined by a spectrum bandwidth, and a wavelength cross-connection is established between the third spectrum range and the fourth spectrum range.

Another aspect of the present invention provides a node device, including:

The third receiving module is configured to receive a request message, and extract the tenth free center frequency set information and spectrum bandwidth information carried in the request message; it is also used to receive a response message, and extract the center frequency information carried in the response message;

The third processing module is used to obtain the tenth idle central frequency set, and obtain the segment connection where the node is located and the spectrum bandwidth of each segment connection between the own node and the second node determined by the first node; the tenth idle central frequency set It is the intersection of the idle center frequency sets of all links between the first node or the fourth node and the node through which the node is located; it is also used to combine the idle center frequency set of the tenth link with the first node Take the intersection of the ten idle center frequency sets to obtain the eleventh idle center frequency set, and obtain the eleventh idle center frequency set information corresponding to the eleventh idle center frequency set; the tenth link is the connection between the node and the The link between the adjacent nodes in the direction from the first node to the second node; it is also used to obtain the center frequency of the section connection where the node is located; the center frequency is the fourth node between the node and the second node or the An available center frequency obtained by the second node from the eleventh free center frequency set according to the spectrum bandwidth of the node’s segment connection; the eleventh idle center frequency set is all the links passed by the node’s segment connection the intersection of sets of free center frequencies;

The third sending module is configured to send the eleventh free center frequency set information and the segment connection where the node is located and each link between the node and the second node to the adjacent node in the direction from the first node to the second node. A request message for spectrum bandwidth information of a segment connection;

The third cross-connection establishment module is configured to establish a wavelength cross-connection based on a spectrum range determined by the center frequency of the section connection where the node is located and the spectrum bandwidth.

One aspect of the present invention provides a system for establishing a wavelength cross-connection, the system includes at least a first node, a second node and a fourth node:

The first node is configured to determine the spectral bandwidth of each segment connection on the wavelength connection, and obtain the fifth available center frequency set of the fifth link according to the spectral bandwidth of the segment connection where the first node is located; the fifth link is The link between the first node and the adjacent nodes in the direction from the first node to the second node; it is also used to obtain the fifth available center frequency set information and the wavelength corresponding to the fifth available center frequency set Connect the spectrum bandwidth information corresponding to the spectrum bandwidth of each segment connection, and send a message carrying the fifth available center frequency set information and the spectrum bandwidth information to the adjacent node in the direction from the first node to the second node request message; it is also used to receive a response message, extract the first center frequency information carried in the response message, and obtain the center frequency of the segment connection where the first node is located, based on the center frequency of the segment connection where the first node is located and Establish wavelength cross-connection in the spectrum range determined by the spectrum bandwidth;

The fourth node is configured to receive the request message, extract the sixth available central frequency set information and the first spectrum bandwidth information carried in the request message, obtain the sixth available central frequency set, and obtain the fourth available central frequency set determined by the first node. The first node side segment connection where the node is located and the spectrum bandwidth of each segment connection between the fourth node and the second node; the sixth available center frequency set is the first node side where the fourth node is located The intersection of the available center frequency sets of all the links through which the segment connection passes; it is also used to obtain an available center frequency in the sixth available center frequency set as the segment connection on the side of the first node where the fourth node is located center frequency; also used to obtain the fourth center frequency information corresponding to the center frequency of the side section connection of the first node; also used to obtain according to the spectrum bandwidth of the side section connection of the second node where the fourth node is located The seventh available central frequency set of the sixth link; the sixth link is a link between the fourth node and the adjacent node in the direction from the first node to the second node; it is also used to obtain the The seventh available central frequency set information corresponding to the seventh available central frequency set obtains the second spectral bandwidth information corresponding to the spectral bandwidth of each segment connection between the fourth node and the second node, and sends the information to the first node The adjacent node in the direction of the second node sends a request message carrying the seventh available center frequency set information and the second spectrum bandwidth information; it is also used to receive a response message, and extract the first response message carried in the response message. Two center frequency information, obtaining the center frequency of the side connection of the second node where the fourth node is located, and determining the first based on the center frequency and spectrum bandwidth of the side connection of the first node where the fourth node is located a spectrum range, determining a second spectrum range based on the center frequency and spectrum bandwidth of the side-section connection of the second node where the fourth node is located, and establishing a wavelength cross-connection between the first spectrum range and the second spectrum range; The center frequency of the side section connection of the second node where the fourth node is located is an available center frequency in the eighth available center frequency set; the eighth available center frequency set is the The intersection of the set of available central frequencies of all the links through which the second node side section is connected; it is also used to send a response carrying the fourth central frequency information to the adjacent node in the direction from the second node to the first node information;

The second node is configured to receive the request message, extract the ninth available central frequency set information and spectrum bandwidth information carried in the request message, and obtain the ninth available central frequency set and the segment where the second node is determined by the first node Spectrum bandwidth of the connection; the ninth set of available center frequencies is the intersection of the set of available center frequencies of all links through which the second node is connected; it is also used to obtain one of the ninth set of available center frequencies The center frequency can be used as the center frequency of the section connection where the second node is located, and a wavelength cross-connection is established based on the center frequency and the spectral bandwidth of the section connection where the second node is located; it is also used to obtain the The fifth center frequency information corresponding to the center frequency of the segment connection, and sending a response message carrying the fifth center frequency information to the adjacent node in the direction from the second node to the first node.

Another aspect of the present invention provides a system for establishing a wavelength cross-connection, the system at least includes a first node, a second node and a fourth node:

The first node is configured to determine the spectral bandwidth of each segment connection on the wavelength connection, and obtain the fifth idle center frequency set information corresponding to the fifth idle center frequency set of the eighth link and the information of each segment connection on the wavelength connection Spectrum bandwidth information corresponding to the spectrum bandwidth, sending a request message carrying the fifth idle central frequency set information and the spectrum bandwidth information to the adjacent node in the direction from the first node to the second node; the eighth link It is the link between the first node and the adjacent node in the direction from the first node to the second node; it is also used to receive a response message, extract the fifth center frequency information carried in the response message, and obtain the The center frequency of the segment connection where the first node is located, and the wavelength cross-connection is established based on the center frequency of the segment connection where the first node is located and the spectral range determined by the spectral bandwidth;

The fourth node is configured to receive the request message, extract the sixth idle central frequency set information and the third spectrum bandwidth information carried in the request message, obtain the sixth idle central frequency set, and obtain the first idle central frequency set where the fourth node is located. The spectrum bandwidth of the node-side segment connection and each segment connection between the fourth node and the second node; the sixth idle central frequency set is all the first node-side segment connections where the fourth node is located. The intersection of the free center frequency sets of links; it is also used to obtain an available center frequency in the sixth free center frequency set according to the spectrum bandwidth of the side section connection of the first node where the fourth node is located, as the The center frequency of the side section connection of the first node where the fourth node is located; is also used to obtain the eighth center frequency information corresponding to the center frequency of the side section connection of the first node where the fourth node is located; Obtaining the seventh idle center frequency set information corresponding to the seventh idle center frequency set of the ninth link; obtaining the fourth spectrum bandwidth information corresponding to the spectrum bandwidth of each segment connection between the fourth node and the second node , sending a request message carrying the seventh free center frequency set information and the fourth spectrum bandwidth information to an adjacent node in the direction from the first node to the second node; the ninth link is between the fourth node and the The link between the adjacent nodes in the direction from the first node to the second node; it is also used to receive the response message, extract the sixth center frequency information carried in the response message, and obtain the location where the fourth node is located. The center frequency of the side section connection of the second node is determined based on the center frequency and spectrum bandwidth of the side section connection of the first node where the fourth node is located, and the third spectrum range is determined based on the side section connection of the fourth node. The fourth spectrum range determined by the center frequency and spectrum bandwidth of the side section connection of the two nodes, a wavelength cross-connection is established between the third spectrum range and the fourth spectrum range; the second node side where the fourth node is located The center frequency of the segment connection is an available center frequency in the eighth idle center frequency set; the eighth idle center frequency set is the idle frequency of all links through which the segment connection on the side of the second node where the fourth node is located The intersection of the center frequency sets; it is also used to send a response message carrying the eighth center frequency information to the adjacent node in the direction from the second node to the first node;

The second node is configured to receive the request message, extract the ninth idle center frequency set information and spectrum bandwidth information carried in the request message, obtain the ninth idle center frequency set, and obtain the location of the second node determined by the first node Spectrum bandwidth of the segment connection; the ninth free center frequency set is the intersection of the idle center frequency sets of all links through which the segment connection of the second node is located; Obtain an available center frequency in the ninth set of free center frequencies as the center frequency of the segment connection where the second node is located, and establish a spectrum range determined based on the center frequency and the spectrum bandwidth of the segment connection where the second node is located wavelength cross-connect; it is also used to obtain the ninth center frequency information corresponding to the center frequency of the section connection where the second node is located, and send the information carrying the ninth center frequency to the adjacent node in the direction from the second node to the first node Reply message for center frequency information.

The embodiments of the present invention provide a method and system for establishing a wavelength cross-connection, and a node device, which can automatically establish a wavelength cross-connection with a variable spectral bandwidth on a node, and is simple to implement and highly reliable.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. Those of ordinary skill in the art can also obtain other drawings based on these drawings without paying creative labor.

FIG. 1a is a flowchart of a method for establishing a wavelength cross-connect provided by an embodiment of the present invention;

FIG. 1b is a flow chart of a method for establishing a wavelength cross-connection provided by another embodiment of the present invention;

FIG. 1c is a flow chart of a method for establishing a wavelength cross-connection provided by another embodiment of the present invention;

FIG. 1d is a flow chart of a method for establishing a wavelength cross-connection provided by another embodiment of the present invention;

FIG. 1e is a flow chart of a method for establishing a wavelength cross-connection provided by another embodiment of the present invention;

Fig. 1f is a flowchart of a method for establishing a wavelength cross-connect provided by another embodiment of the present invention;

FIG. 1g is a flow chart of a method for establishing a wavelength cross-connection provided by another embodiment of the present invention;

FIG. 1h is a flow chart of a method for establishing a wavelength cross-connection provided by another embodiment of the present invention;

Fig. 1i is a flow chart of a method for establishing a wavelength cross-connect provided by another embodiment of the present invention;

FIG. 1j is a flow chart of a method for establishing a wavelength cross-connection provided by another embodiment of the present invention;

FIG. 1k is a flowchart of a method for establishing a wavelength cross-connection provided by another embodiment of the present invention;

FIG. 11 is a flow chart of a method for establishing a wavelength cross-connection provided by another embodiment of the present invention;

FIG. 1m is a flow chart of a method for establishing a wavelength cross-connection provided by another embodiment of the present invention;

FIG. 1n is a flow chart of a method for establishing a wavelength cross-connect provided by another embodiment of the present invention;

FIG. 2 is a schematic diagram of spectrum resources of an optical fiber link provided by an embodiment of the present invention;

FIG. 3 is a schematic diagram of a wavelength division network topology provided by an embodiment of the present invention;

FIG. 4a is a schematic diagram of optical fiber spectrum resources of link A-B in a wavelength division network provided by an embodiment of the present invention;

Fig. 4b is a schematic diagram of optical fiber spectrum resources of link B-C in a wavelength division network provided by an embodiment of the present invention;

FIG. 5 is a schematic diagram of another WDM network topology provided by an embodiment of the present invention;

FIG. 6a is a schematic diagram of optical fiber spectrum resources of link A-D in another wavelength division network provided by an embodiment of the present invention;

Fig. 6b is a schematic diagram of optical fiber spectrum resources of link D-E in another wavelength division network provided by an embodiment of the present invention;

Fig. 6c is a schematic diagram of optical fiber spectrum resources of link E-C in another wavelength division network provided by an embodiment of the present invention;

Fig. 7a is the encapsulation format of the traffic parameter object payload provided by the embodiment of the present invention;

Figure 7b is the encapsulation format of the label request object payload provided by the embodiment of the present invention;

Fig. 7c is the encapsulation format of the label object payload provided by the embodiment of the present invention;

FIG. 8 is a structural block diagram of a node device provided by an embodiment of the present invention;

FIG. 9 is a structural block diagram of another node device provided by an embodiment of the present invention;

FIG. 10 is a structural block diagram of another node device provided by an embodiment of the present invention;

FIG. 11 is a structural block diagram of another node device provided by an embodiment of the present invention;

FIG. 12 is a schematic diagram of a system for establishing a wavelength cross-connect provided by an embodiment of the present invention;

FIG. 13 is a schematic diagram of another system for establishing a wavelength cross-connection provided by an embodiment of the present invention;

detailed description

Embodiments of the present invention provide a method and system for establishing a wavelength cross-connection, and a node device. In order to better understand the technical solutions of the present invention, the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

It should be clear that the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

In an embodiment of the present invention, a flow chart of a method for establishing a wavelength cross-connect is shown in FIG. 1a. The method includes the following steps:

Step S101a, the first node determines the spectral bandwidth of the wavelength connection, and obtains the first available center frequency set of the first link according to the spectral bandwidth; the first link is the first node and the adjacent nodes in the direction from the first node to the second node link between.

Step S102a, the first node obtains the first available center frequency set information corresponding to the first available center frequency set and the spectrum bandwidth information corresponding to the spectrum bandwidth, and sends a message carrying the first available center frequency information to adjacent nodes in the direction from the first node to the second node. A request message for frequency set information and spectrum bandwidth information.

Step S103a, the first node receives the response message, extracts the center frequency information carried in the response message, obtains the center frequency of the wavelength connection, and establishes a wavelength cross-connection based on the center frequency and the spectrum range determined by the spectrum bandwidth; the center frequency is the second node at An available center frequency obtained from the second set of available center frequencies; the second set of available center frequencies is an intersection of sets of available center frequencies of all links through which the wavelength connection passes.

In another embodiment of the present invention, a flow of a method for establishing a wavelength cross-connection is shown in FIG. 1b. The method includes the following steps:

Step S101b, the second node receives the request message, extracts the second available center frequency set information and spectrum bandwidth information carried in the request message, and obtains the second available center frequency set and the spectrum bandwidth of the wavelength connection determined by the first node; the second The set of available center frequencies is the intersection of the sets of available center frequencies of all links through which the wavelength connection passes.

In step S102b, the second node obtains an available center frequency from the second set of available center frequencies as the center frequency of the wavelength connection, and establishes a wavelength cross-connection based on the center frequency and the spectrum range determined by the spectrum bandwidth.

In yet another embodiment of the present invention, a flow of a method for establishing a wavelength cross-connection is shown in FIG. 1c. The method includes the following steps:

Step S101c, the third node receives the request message, extracts the third available central frequency set information and spectrum bandwidth information carried in the request message, and obtains the third available central frequency set and the spectral bandwidth of the wavelength connection determined by the first node; The set of available center frequencies is an intersection of sets of available center frequencies of all links between the first node and the third node through which the wavelength connection passes.

Step S102c, the third node obtains the set of available center frequencies of the second link according to the spectrum bandwidth, takes the intersection of the set of available center frequencies of the second link and the third set of available center frequencies, obtains the fourth set of available center frequencies, and obtains the set of available center frequencies of the second link. The fourth available center frequency set information corresponding to the four available center frequency sets; the second link is the link between the third node and the adjacent node in the direction from the first node to the second node; the third node sends the first node to the second node The second node sends a request message carrying the fourth available center frequency set information and the spectrum bandwidth information to the neighboring node.

Step S103c, the third node receives the response message, extracts the center frequency information carried in the response message, obtains the center frequency of the wavelength connection, and establishes a wavelength cross-connection based on the center frequency and the spectrum range determined by the spectrum bandwidth; the center frequency is the second node at An available center frequency obtained from the second set of available center frequencies; the second set of available center frequencies is an intersection of sets of available center frequencies of all links through which the wavelength connection passes.

In yet another embodiment of the present invention, a flow of a method for establishing a wavelength cross-connection is shown in FIG. 1d. The method includes the following steps:

Step S101d, the first node determines the spectral bandwidth of the wavelength connection, obtains the first idle central frequency set information corresponding to the first idle central frequency set of the third link and the spectral bandwidth information corresponding to the spectral bandwidth, and sends the information to the first node to the second The adjacent node in the direction of the node sends a request message carrying the first free center frequency set information and the spectrum bandwidth information; the third link is the link between the first node and the adjacent node in the direction from the first node to the second node.

Step S102d, the first node receives the response message, extracts the center frequency information carried in the response message, obtains the center frequency of the wavelength connection, and establishes a wavelength cross-connection based on the center frequency and the spectrum range determined by the spectrum bandwidth; the center frequency is the second node according to The spectrum bandwidth is obtained from an available center frequency in the second free center frequency set; the second free center frequency set is an intersection of free center frequency sets of all links through which the wavelength connection passes.

In yet another embodiment of the present invention, a flow of a method for establishing a wavelength cross-connection is shown in FIG. 1e. The method includes the following steps:

Step S101e, the second node receives the request message, extracts the second idle center frequency set information and spectrum bandwidth information carried in the request message, and obtains the second idle center frequency set and the spectrum bandwidth of the wavelength connection determined by the first node; the second The set of free center frequencies is the intersection of sets of free center frequencies of all links through which the wavelength connection passes.

In step S102e, the second node obtains an available center frequency from the second free center frequency set according to the spectrum bandwidth as the center frequency of the wavelength connection, and establishes a wavelength cross-connection based on the spectrum range determined by the center frequency and the spectrum bandwidth.

In yet another embodiment of the present invention, a flow of a method for establishing a wavelength cross-connection is shown in FIG. 1f, and the method includes the following steps:

Step S101f, the third node receives the request message, extracts the third idle center frequency set information and spectrum bandwidth information carried in the request message, and obtains the third idle center frequency set and the spectrum bandwidth of the wavelength connection determined by the first node; the third The free central frequency set is an intersection of free central frequency sets of all links between the first node and the third node through which the wavelength connection passes.

Step S102f, the third node intersects the idle center frequency set of the fourth link with the third idle center frequency set to obtain the fourth idle center frequency set, and obtain the fourth idle center frequency set information corresponding to the fourth idle center frequency set ; The fourth link is the link between the third node and the adjacent node in the direction from the first node to the second node; the third node sends the fourth idle center frequency to the adjacent node in the direction from the first node to the second node A request message for aggregate information and spectrum bandwidth information.

Step S103f, the third node receives the response message, extracts the center frequency information carried in the response message, obtains the center frequency of the wavelength connection, and establishes a wavelength cross-connection based on the center frequency and the spectrum range determined by the spectrum bandwidth; the center frequency is the second node according to The spectrum bandwidth is obtained from an available center frequency in the second free center frequency set; the second free center frequency set is an intersection of free center frequency sets of all links through which the wavelength connection passes.

In yet another embodiment of the present invention, a flow of a method for establishing a wavelength cross-connection is shown in FIG. 1g, and the method includes the following steps:

Step S101g, the first node determines the spectral bandwidth of each segment connection on the wavelength connection, and obtains the fifth available center frequency set of the fifth link according to the spectral bandwidth of the segment connection where the first node is located; the fifth link is the first node and Links between adjacent nodes in the direction from the first node to the second node.

Step S102g, obtain the fifth available central frequency set information corresponding to the fifth available central frequency set and the spectral bandwidth information corresponding to the spectral bandwidth of each segment connection on the wavelength connection, and send it to the adjacent node in the direction from the first node to the second node A request message carrying fifth available central frequency set information and spectrum bandwidth information.

Step S103g, the first node receives the response message, extracts the first center frequency information carried in the response message, obtains the center frequency of the segment connection where the first node is located, and determines the frequency spectrum based on the center frequency and spectrum bandwidth of the segment connection where the first node is located range to establish a wavelength cross-connection; the center frequency is an available center frequency obtained by the fourth node between the first node and the second node in the sixth available center frequency set; the sixth available center frequency set is the segment connection where the first node is located Intersection of the set of available center frequencies for all links.

In yet another embodiment of the present invention, a flow of a method for establishing a wavelength cross-connection is shown in FIG. 1h. The method includes the following steps:

Step S101h, the second node receives the request message, extracts the ninth available central frequency set information and spectrum bandwidth information carried in the request message, and obtains the ninth available central frequency set and the spectrum connected to the section where the second node is located determined by the first node Bandwidth; the ninth set of available center frequencies is the intersection of sets of available center frequencies of all links through which the segment where the second node is located is connected.

Step S102h, the second node obtains an available center frequency from the ninth set of available center frequencies as the center frequency of the segment connection where the second node is located, and establishes a wavelength crossover based on the center frequency and the spectral bandwidth of the segment connection where the second node is located. connect.

In yet another embodiment of the present invention, a flow of a method for establishing a wavelength cross-connection is shown in FIG. 1i. The method includes the following steps:

Step S101i, the fourth node receives the request message, extracts the sixth available central frequency set information and the first spectrum bandwidth information carried in the request message, obtains the sixth available central frequency set, and obtains the location of the fourth node determined by the first node. Spectrum bandwidth of the first node side segment connection and each segment connection between the fourth node and the second node; the sixth set of available center frequencies is the available center frequency of all links through which the first node side segment connection where the fourth node is located The intersection of sets.

In step S102i, the fourth node obtains an available center frequency from the sixth set of available center frequencies as the center frequency of the side-section connection of the first node where the fourth node is located.

Step S103i, the fourth node obtains the seventh available central frequency set of the sixth link according to the spectrum bandwidth of the side connection of the second node where the fourth node is located; the sixth link is the connection between the fourth node and the first node to the second node Links between adjacent nodes in the direction; obtain the seventh available central frequency set information corresponding to the seventh available central frequency set, and obtain the second spectral bandwidth information corresponding to the spectral bandwidth of each segment connection between the fourth node and the second node , sending a request message carrying the seventh available center frequency set information and the second spectrum bandwidth information to the adjacent nodes in the direction from the first node to the second node.

Step S104i, the fourth node receives the response message, extracts the second center frequency information carried in the response message, and obtains the center frequency of the side segment connection of the second node where the fourth node is located, based on the side segment of the first node where the fourth node is located The central frequency and spectral bandwidth of the connection determine the first spectral range, and the second spectral range is determined based on the central frequency and spectral bandwidth of the side connection of the second node where the fourth node is located, and wavelength crossing is established between the first spectral range and the second spectral range connection; the center frequency of the side section connection of the second node where the fourth node is located is an available center frequency in the eighth available center frequency set; the eighth available center frequency set is the side section connection of the second node where the fourth node is located Intersection of the set of available center frequencies for all links.

In yet another embodiment of the present invention, a flow of a method for establishing a wavelength cross-connection is shown in FIG. 1j. The method includes the following steps:

Step S101j, the third node receives the request message, extracts the tenth available central frequency set information and spectrum bandwidth information carried in the request message, obtains the ninth available central frequency set, obtains the segment connection and Spectrum bandwidth of each segment connection between the third node and the second node; the ninth available central frequency set is the available center of all links between the first node or the fourth node and the third node through which the segment connection of the third node passes Intersection of sets of frequencies.

Step S102j, the third node obtains the set of available center frequencies of the seventh link according to the spectrum bandwidth of the segment connection where the third node is located; the intersection of the set of available center frequencies of the seventh link and the set of tenth available center frequencies is obtained to obtain the set of tenth An available center frequency set, obtaining the eleventh available center frequency set information corresponding to the eleventh available center frequency set; the seventh link is the link between the third node and the adjacent node in the direction from the first node to the second node ; The third node sends a request message carrying the eleventh available center frequency set information and spectrum bandwidth information to the adjacent nodes in the direction from the first node to the second node.

Step S103j, the third node receives the response message, extracts the third center frequency information carried in the response message, obtains the center frequency of the segment connection where the third node is located, and determines the frequency spectrum based on the center frequency and spectrum bandwidth of the segment connection where the third node is located range to establish a wavelength cross-connection; the center frequency is an available center frequency obtained by the fourth node between the third node and the second node or the second node in the eleventh available center frequency set; the eleventh available center frequency set is the first The intersection of the available center frequency sets of all links connected by the segment where the three nodes are located.

In yet another embodiment of the present invention, a flow of a method for establishing a wavelength cross-connection is shown in FIG. 1k, and the method includes the following steps:

Step S101k, the first node determines the spectral bandwidth of each segment connection on the wavelength connection, and obtains the fifth idle central frequency set information corresponding to the fifth idle central frequency set of the eighth link and the spectral bandwidth of each segment connection on the wavelength connection For the corresponding spectrum bandwidth information, send a request message carrying the fifth free center frequency set information and spectrum bandwidth information to the adjacent nodes in the direction from the first node to the second node; the eighth link is the link between the first node and the first node to the second node Links between adjacent nodes in the two-node direction.

Step S102k, the first node receives the response message, extracts the fifth center frequency information carried in the response message, obtains the center frequency of the segment connection where the first node is located, and determines the spectrum based on the center frequency and spectrum bandwidth of the segment connection where the first node is located The range establishes a wavelength cross-connection; the center frequency is an available center frequency obtained from the sixth free center frequency set by the fourth node between the first node and the second node according to the spectral bandwidth of the segment connection where the first node is located; the sixth free center frequency The set is the intersection set of idle center frequencies of all links through which the segment connection of the first node is connected.

In yet another embodiment of the present invention, a flow of a method for establishing a wavelength cross-connection is shown in FIG. 11. The method includes the following steps:

Step S101l, the second node receives the request message, extracts the ninth free central frequency set information and spectrum bandwidth information carried in the request message, obtains the ninth free central frequency set, and obtains the segment connection information of the second node determined by the first node Spectrum bandwidth; the ninth free central frequency set is the intersection of free central frequency sets of all links through which the segment where the second node is located is connected.

Step S102l, the second node acquires an available center frequency in the ninth free center frequency set according to the spectrum bandwidth of the segment connection where the second node is located, as the center frequency of the segment connection where the second node is located, based on the center frequency of the segment connection where the second node is located A wavelength cross-connect is established for a spectrum range determined by frequency and spectrum bandwidth.

In yet another embodiment of the present invention, a flow of a method for establishing a wavelength cross-connection is shown in FIG. 1m, and the method includes the following steps:

Step S101m, the fourth node receives the request message, extracts the sixth idle center frequency set information and the third spectrum bandwidth information carried in the request message, obtains the sixth idle center frequency set, and obtains the side section of the first node where the fourth node is located The connection and the spectrum bandwidth of each segment connection between the fourth node and the second node; the sixth idle central frequency set is the intersection of idle central frequency sets of all links through which the segment connection on the side of the first node where the fourth node is located passes.

Step S102m, the fourth node obtains an available center frequency from the sixth free center frequency set according to the spectrum bandwidth of the side connection of the first node where the fourth node is located, as the center frequency of the side connection of the first node where the fourth node is located .

Step S103m, the fourth node obtains the information of the seventh free central frequency set corresponding to the seventh free central frequency set of the ninth link; obtains the fourth spectral bandwidth corresponding to the spectral bandwidth of each segment connection between the fourth node and the second node information, sending a request message carrying the seventh free center frequency set information and the fourth spectrum bandwidth information to the adjacent node in the direction from the first node to the second node; the ninth link is the connection between the fourth node and the first node to the second node Links between adjacent nodes in the direction.

Step S104m, the fourth node receives the response message, extracts the sixth center frequency information carried in the response message, and obtains the center frequency of the side segment connection of the second node where the fourth node is located, based on the side segment of the first node where the fourth node is located The central frequency and spectral bandwidth of the connection determine the third spectral range, and the fourth spectral range is determined based on the central frequency and spectral bandwidth of the side connection of the second node where the fourth node is located, and a wavelength is established between the third spectral range and the fourth spectral range Cross connection; the center frequency of the second node side section connection where the fourth node is located is an available center frequency in the eighth free center frequency set; the eighth free center frequency set is the second node side section connection where the fourth node is located via The intersection of the set of available center frequencies of all links in .

In yet another embodiment of the present invention, a flow of a method for establishing a wavelength cross-connection is shown in FIG. 1n. The method includes the following steps:

Step S101n, the third node receives the request message, extracts the tenth idle center frequency set information and spectrum bandwidth information carried in the request message, obtains the tenth idle center frequency set, and obtains the segment connection and the location of the third node determined by the first node Spectrum bandwidth of each segment connection between the third node and the second node; the tenth idle center frequency set is the idle center of all links between the first node or the fourth node to the third node through which the segment connection of the third node passes Intersection of sets of frequencies.

Step S102n, the third node intersects the idle center frequency set of the tenth link with the tenth idle center frequency set to obtain the eleventh idle center frequency set, and obtain the eleventh idle center corresponding to the eleventh idle center frequency set Frequency set information; the tenth link is the link between the third node and the adjacent node in the direction from the first node to the second node; the third node sends the adjacent node carrying the tenth link to the adjacent node in the direction from the first node to the second node A request message for free center frequency set information and segment connection and spectrum bandwidth information where the third node is located;

Step S103n, the third node receives the response message, extracts the center frequency information carried in the response message, obtains the center frequency of the segment connection where the third node is located, and establishes a spectrum range determined based on the center frequency and spectrum bandwidth of the segment connection where the third node is located Wavelength cross-connection; the center frequency is an available center frequency obtained by the fourth node between the third node and the second node or the second node in the eleventh free center frequency set according to the spectral bandwidth of the connection of the segment where the third node is located; The set of eleven idle center frequencies is the intersection of the idle center frequencies of all the links through which the segment where the third node is located is connected.

A method, system, and node device for establishing a wavelength cross-connection provided by embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

It should be clear that the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

In the following embodiments, the spectrum resources of the fiber link start from 194.1THz to divide the center frequency, and step to both sides with 6.25GHz as the center frequency, then the spectrum resources in the fiber link can be divided as shown in Figure 2, the center The frequency can be calculated according to the following formula:

f _n =193.1+(n×6.25/1000)(THz)

Where n is an integer, for example: when n=0, the center frequency _f0 is 193.1THz; when n= ₇ , the center frequency f7 is 193.14375THz; when n=-8, the center frequency f- ₈ is 193.05THz.

Embodiment 1. This embodiment of the present invention provides a method for establishing a wavelength cross-connect. In the WDM network shown in FIG. 3 , the lines between nodes A, B, C, and D represent optical fiber links.

The network management or client notifies node A to establish the wavelength connection between node A interface 1 and node C interface 6 in Figure 3, the spectrum bandwidth requirement is 50 GHz, and the center frequency is f _-8 =193.1+(-8×6.25/1000)= 193.05 THz. Node A calculates or obtains the route of the wavelength connection through the network management as (A, B, C), namely (interface 1, interface 2, interface 3, interface 4, interface 5, interface 6), then node A is the source node, node B is an intermediate node, and node C is a sink node. The method specifically includes the following steps:

In step S201, node A sends a request message carrying center frequency information and spectrum bandwidth information of a wavelength connection to node B.

Node A determines that the center frequency of the wavelength connection is f _-8 =193.05 THz, and the spectrum bandwidth of the wavelength connection is 50 GHz. Node A sends a request message to the downstream node B, and the request message carries spectrum bandwidth information and center frequency information, which in this embodiment are spectrum bandwidth 50 GHz and center frequency f _-8 =193.05 THz. In addition, the request message may also carry display routing information (interface 3, interface 4, interface 5, interface 6).

Step S202, Node B receives the request message, extracts the center frequency information and spectrum bandwidth information carried in the request message, obtains the center frequency and spectrum bandwidth of the wavelength connection, and sends a request message carrying the center frequency information and spectrum bandwidth information to Node C.

Node B receives the request message sent by node A, extracts the center frequency information and spectrum bandwidth information carried in the request message, and obtains a spectrum bandwidth of 50 GHz and a center frequency f _-8 .

Node B sends a request message to node C, and the request message carries center frequency information and spectrum bandwidth information, which in this embodiment are spectrum bandwidth 50 GHz and center frequency f _-8 . In addition, the request message may also carry display routing information (interface 5, interface 6).

Step S203, node C receives the request message, extracts the center frequency information and spectrum bandwidth information carried in the request message, obtains the center frequency and spectrum bandwidth of the wavelength connection, establishes a wavelength cross-connection based on the center frequency and spectrum bandwidth, and sends the carried Reply message for center frequency information.

Node C receives the request message sent by node B, extracts the center frequency information and spectrum bandwidth information carried in the request message, and obtains a spectrum bandwidth of 50 GHz and a center frequency f _-8 .

Node C sets the working frequency of interface 6 to the center frequency f- ₈ = 193.05THz, and determines the spectrum range occupied by the wavelength connection according to the center frequency f- ₈ and the spectrum bandwidth of 50 GHz:

Minimum frequency = center frequency - spectrum bandwidth/2;

Highest frequency = center frequency + spectrum bandwidth/2.

That is, the spectrum range occupied by the wavelength connection is 193.05625-193.10625 THz, and the above-mentioned spectrum ranges of interface 5 and interface 6 are used to establish wavelength crossing.

Node C sends a response message to Node B, and the response message carries center frequency information, which is the center frequency f _-8 in this embodiment.

Step S204, Node B receives the response message, extracts the center frequency information carried in the response message, establishes a wavelength cross-connection based on the center frequency and spectrum bandwidth, and sends a response message carrying the center frequency information to Node A.

Node B receives the response message sent by node C, extracts the center frequency information carried in the response message, and obtains the center frequency f _-8 . According to the center frequency f _-8 and the spectrum bandwidth of 50 GHz, it is determined that the spectrum range occupied by the wavelength connection is 193.025-193.075 THz, and the wavelength crossing is established between the above spectrum ranges of interface 3 and interface 4.

Node B sends a response message to node A, and the response message carries center frequency information, which is the center frequency f _-8 in this embodiment.

In step S205, node A receives the response message, extracts the center frequency information carried in the response message, and establishes a wavelength cross-connection based on the center frequency and spectrum bandwidth.

Node A receives the response message sent by the downstream node B, extracts the center frequency information carried in the response message, and obtains the center frequency f _-8 .

Node A sets the working frequency of interface 1 to the center frequency f _-8 = 193.05THz. According to the center frequency f _-8 and the spectrum bandwidth of 50GHz, it is determined that the frequency spectrum occupied by the wavelength connection is 193.025-193.075THz, and the interface 1 and interface 2 The above spectral range establishes wavelength crossing.

For the case where the spectral bandwidth and center frequency of the wavelength connection are known, in addition to the method in Embodiment 1, each node can also use other steps to establish a cross-connection, for example:

The source node directly establishes the cross-connection according to the spectrum bandwidth determined by the wavelength connection and the spectrum range determined by the center frequency, and the request message carrying the spectrum bandwidth information and the center frequency information can be sent to the downstream node before or after the cross-connection is established.

The intermediate node receives the request message carrying spectrum bandwidth information and center frequency information, and establishes a cross-connection according to the spectrum range determined by the spectrum bandwidth and center frequency of the wavelength connection, and the request message carrying spectrum bandwidth information and center frequency information can be used before establishing the cross-connection Or send it to the downstream node later;

The intermediate node receives the response message carrying the spectrum bandwidth and center frequency, first sends the response message carrying spectrum bandwidth information and center frequency information to the upstream node, and then establishes a cross-connection according to the spectrum range determined by the spectrum bandwidth and center frequency of the wavelength connection.

The sink node receives a request message carrying spectrum bandwidth information and center frequency information, first sends a response message carrying spectrum bandwidth information and center frequency information to the upstream node, and then establishes a cross-connection according to the spectrum range determined by the spectrum bandwidth and center frequency of the wavelength connection .

Each node can determine the sequence between message sending or message receiving and cross-connection establishment according to the configuration attributes, and the specific execution steps are similar to those in Embodiment 1, and will not be repeated here.

In Embodiment 1, the spectrum bandwidth and central frequency of the wavelength connection are known, and are notified to the nodes on the wavelength connection through a request message. It is also possible to automatically select the center frequency of the wavelength connection according to the spectrum resources of all the links through which the wavelength connection passes. The method will be described in detail in the following embodiments.

Embodiment 2. This embodiment of the present invention provides a method for establishing a wavelength cross-connect. In the WDM network shown in FIG. 3 , the lines between nodes A, B, C, and D represent optical fiber links.

The network management or client notifies node A to establish a wavelength connection between interface 1 of node A and interface 6 of node C in Figure 3, and the spectrum bandwidth requirement is 50 GHz. Node A calculates or obtains the route of the wavelength connection through the network management as (A, B, C), namely (interface 1, interface 2, interface 3, interface 4, interface 5, interface 6), then node A is the source node, node B is an intermediate node, and node C is a sink node. The method specifically includes the following steps:

In step S301, node A determines the spectral bandwidth of the wavelength connection, and obtains a set of available central frequencies of link A-B according to the spectral bandwidth; sends a request message to node B, and the request message carries information about the set of available central frequencies and spectral bandwidth information.

Node A determines that the spectral bandwidth of the wavelength connection is 50 GHz. The link between node A and the downstream adjacent node B (that is, the direction from source node A to sink node C) is link A-B, and node A obtains the set of available center frequencies of link A-B according to the spectrum bandwidth of 50 GHz.

As shown in Figure 4a, the idle spectrum resource of link AB is 193.04375~193.125THz, and the idle center frequency set is {f _-9 , f _-8 , f _-7 , f _-6 , f _-5 , f _-4 , f _-3 , f _-2 , f _-1 , f ₀ , f ₁ , f ₂ , f ₃ , f ₄ }.

According to the spectrum bandwidth of 50 GHz, determine the frequency range covered by each center frequency in the free center frequency set:

Lowest frequency = center frequency – spectral bandwidth/2;

Highest frequency = center frequency + spectrum bandwidth/2.

If the center frequencies included in the frequency range covered by an idle center frequency are all idle center frequencies, it is determined that the idle center frequency is an available center frequency.

For example: center frequency f _-7 = 193.05625THz covers a frequency range of 193.03125~193.08125THz, including center frequencies f _-11 , f _-10 , f _-9 , f _-8 , f _-7 , f _-6 , f _-5 , f _-4 , f _-3 , where f _-11 and f _-10 are not idle frequencies, then the center frequency f _-7 is not an available center frequency; the frequency range covered by the center frequency f _-3 = 193.08125THz is 193.05625～193.10625, including Center frequencies f _-7 , f _-6 , f _-5 , f _-4 , f _-3 , f _-2 , f _-1 , f ₀ , f ₁ are all free center frequencies, then center frequency f _-3 is available Center frequency. By analogy, node A obtains a set of available center frequencies of link AB as {f ₋₅ , f ₋₄ , f ₋₃ , f ₋₂ , f ₋₁ , f ₀ }.

Obtain the available center frequency set information corresponding to the available center frequency set of link A-B and the spectrum bandwidth information corresponding to the spectrum bandwidth of 50 GHz.

Node A sends a request message to the downstream (that is, the direction from source node A to sink node C) adjacent node B. The request message carries spectrum bandwidth information and available center frequency set information. In this embodiment, the spectrum bandwidth is 50 GHz and the available center frequency Set {f ₋₅ , f ₋₄ , f ₋₃ , f ₋₂ , f ₋₁ , f ₀ }. In addition, the request message may also carry display routing information (interface 3, interface 4, interface 5, interface 6).

Step S302, Node B receives the request message, extracts the available center frequency set information and spectrum bandwidth information carried in the request message, obtains the available center frequency set of link A-B and the spectrum bandwidth of the wavelength connection; obtains the link B-C according to the spectrum bandwidth The set of available center frequencies, intersect the set of available center frequencies of link B-C and the set of available center frequencies of link A-B to obtain an updated set of available center frequencies; send a request message to node C, and the request message carries the updated available center frequency Aggregation information and spectrum bandwidth information.

Node B receives the request message sent by node A, extracts the available central frequency set information and spectrum bandwidth information carried in the request message, and obtains the available central frequency set {f _-5 , f _-4 , f _-3 , f _-2 , f _-1 , f ₀ } and the spectrum bandwidth connected by this wavelength is 50GHz.

The link between node B and the downstream adjacent node C (from source node A to sink node C) is link BC. As shown in Figure 4b, the idle spectrum resource of link BC is 193.05625-193.11875THz, and the idle center The set of frequencies is {f ₋₇ , f ₋₆ , f ₋₅ , f ₋₄ , f ₋₃ , f ₋₂ , f ₋₁ , f ₀ , f ₁ , f ₂ , f ₃ }.

According to the spectral bandwidth of 50 GHz, the node B obtains the set of available center frequencies of the link BC as {f ₋₃ , f ₋₂ , f ₋₁ } in a manner similar to step 301 in this embodiment.

The set of available center frequencies {f _-5 , f _-4 , f _-3 , f _-2 , f _-1 , f ₀ } of link AB and the set of available center frequencies of link BC {f _-3 , f _-2 , f _-1 } take the intersection to obtain an updated set of available center frequencies {f _-3 , f _-2 , f _-1 }, and obtain the updated set of available center frequencies corresponding to the updated set of available center frequencies.

Node B sends a request message to the downstream (that is, the direction from source node A to sink node C) adjacent node C, and the request message carries updated available central frequency set information and spectrum bandwidth information, which in this embodiment is the available central frequency set{ f _-3 , f _-2 , f _-1 } and a spectrum bandwidth of 50GHz. In addition, the request message may also carry display routing information (interface 5, interface 6).

Step S303, node C receives the request message, extracts the available central frequency set information and spectral bandwidth information carried in the request message, and obtains the intersection of the available central frequency sets of all links through which the wavelength connection passes and the spectral bandwidth of the wavelength connection; An available center frequency is obtained from the intersection of available center frequency sets of all links as the center frequency of the wavelength connection, and a wavelength cross-connection is established based on the center frequency and spectrum bandwidth; a response message is sent to Node B, and the response message carries center frequency information.

Node C receives the request message sent by Node B, extracts the available center frequency set information and spectrum bandwidth information carried in the request message, and obtains the available center frequency set of all links (including links AB and BC) through which the wavelength connection passes. The spectrum bandwidth of intersection {f _-3 , f _-2 , f _-1 } and wavelength connection is 50GHz.

Node C obtains an available center frequency as the center frequency of the wavelength connection from the intersection of the available center frequency sets of all links: if there is only one available center frequency in the available center frequency set, then select the available center frequency as the wavelength connection Center frequency; if there are multiple available center frequencies in the set of available center frequencies, one of the available center frequencies may be randomly selected or selected by a certain rule as the center frequency of the wavelength connection, which is not limited in this embodiment.

In this embodiment, node C selects f _-3 as the center frequency from the set of available center frequencies {f _-3 , f _-2 , f _-1 }.

Node C sets the working frequency of interface 6 to the center frequency f _-3 = 193.1+(-3×6.25/1000) = 193.08125THz, and according to the center frequency f _-3 and the spectrum bandwidth of 50GHz, it is determined that the spectrum range occupied by the wavelength connection is From 193.05625 to 193.10625 THz, wavelength crossing is established for the above spectrum ranges of interface 5 and interface 6.

The center frequency information corresponding to the center frequency f _-3 =193.08125 THz of the wavelength connection is obtained.

Node C sends an acknowledgment message to the upstream adjacent node B (that is, the direction from sink node C to source node A), and the acknowledgment message carries center frequency information, which is the center frequency f _-3 in this embodiment.

Step S304, Node B receives the response message, extracts the center frequency information carried in the response message, obtains the center frequency of the wavelength connection, and establishes a wavelength cross-connection based on the center frequency and spectrum bandwidth; sends a response message to Node A, and the response message carries the center frequency information.

Node B receives the response message sent by node C, extracts the center frequency information carried in the response message, and obtains the center frequency f _-3 of the wavelength connection. According to the center frequency f _-3 and the spectrum bandwidth of 50 GHz, it is determined that the spectrum range occupied by the wavelength connection is 193.05625-193.10625 THz, and the wavelength crossing is established between the above spectrum ranges of interface 3 and interface 4.

The node B sends a response message to the upstream neighbor node A (ie the direction from the sink node C to the source node A), and the response message carries center frequency information, which is the center frequency f _-3 in this embodiment.

Step S305, node A receives the response message, extracts the center frequency information carried in the response message, obtains the center frequency of the wavelength connection, and establishes a wavelength cross-connection based on the center frequency and the spectrum range determined by the spectrum bandwidth.

Node A receives the response message sent by node B, extracts the center frequency information carried in the response message, and obtains the center frequency f _-3 .

Node A sets the working frequency of interface 1 as the center frequency f ₋₃ =193.1+(-3×6.25/1000)=193.08125 THz. According to the center frequency f _-3 and the spectrum bandwidth of 50 GHz, it is determined that the spectrum range occupied by the wavelength connection is 193.05625-193.10625 THz, and the wavelength crossing is established between the above spectrum ranges of interface 1 and interface 2.

In the second embodiment, the set of center frequencies available to all links passed by the wavelength connection is collected through the request message, that is, the intersection of the set of available center frequencies of all the links passed by the wavelength connection is collected. The sink node of the request message (that is, node C in the second embodiment) obtains an available center frequency from the intersection as the center frequency of the wavelength connection.

To determine the center frequency of the wavelength connection, the following method can also be used: collect the center frequency set that all the links passing through the wavelength connection are idle through the request message, that is, collect the intersection of the idle center frequency sets of all the links passing through the wavelength connection, and request The sink node of the message selects an available center frequency in the intersection as the center frequency of the wavelength connection. The method is described in detail below through Embodiment 3 of the present invention.

Embodiment 3, the embodiment of the present invention provides a method for establishing a wavelength cross-connect. In the WDM network shown in FIG. 3 , the lines between nodes A, B, C, and D represent optical fiber links.

The network management or client notifies node A to establish a wavelength connection between interface 1 of node A and interface 6 of node C in Figure 3, and the spectrum bandwidth requirement is 50 GHz. Node A calculates or obtains the route of the wavelength connection through the network management as (A, B, C), namely (interface 1, interface 2, interface 3, interface 4, interface 5, interface 6), then node A is the source node, node B is the intermediate node, and node C is the sink node. The method specifically includes the following steps:

In step S401, node A determines the spectrum bandwidth of the wavelength connection; sends a request message to node B, and the request message carries idle center frequency set information and spectrum bandwidth information.

Node A determines that the spectral bandwidth of the wavelength connection is 50 GHz. The link between node A and the downstream adjacent node B (that is, the direction from source node A to sink node C) is link AB. As shown in Figure 4a, the idle spectrum resource of link AB is 193.04375~193.125THz, and the idle center frequency set is {f _-9 , f _-8 , f _-7 , f _-6 , f _-5 , f _-4 , f _-3 , f _-2 , f _-1 , f ₀ , f ₁ , f ₂ , f ₃ , f ₄ }.

Obtain the free center frequency set information corresponding to the free center frequency set of link A-B and the spectrum bandwidth information corresponding to the spectrum bandwidth of 50 GHz.

Node A sends a request message to the downstream (that is, the direction from source node A to sink node C) adjacent node B, and the request message carries spectrum bandwidth information and free center frequency set information, in this embodiment, the spectrum bandwidth is 50 GHz and the free center frequency Set { f _-9 , f _-8 , f _-7 , f _-6 , f _-5 , f _-4 , f _-3 , f _-2 , f _-1 , f ₀ , f ₁ , f ₂ , f ₃ , f ₄ }. In addition, the request message may also carry display routing information (interface 3, interface 4, interface 5, interface 6).

Step S402, Node B receives the request message, extracts the idle center frequency set information and spectrum bandwidth information carried in the request message; obtains the idle center frequency set of link A-B and the spectrum bandwidth of the wavelength connection; links B-C idle center frequency The set is intersected with the free center frequency set of link A-B to obtain an updated free center frequency set; a request message is sent to node C, and the request message carries the updated free center frequency set information and spectrum bandwidth information.

Node B receives the request message sent by node A, extracts the free center frequency set information and spectrum bandwidth information carried in the request message, and obtains the free center frequency set {f _-9 , f _-8 , f _-7 , f _-6 , f _-5 , f _-4 , f _-3 , f _-2 , f _-1 , f ₀ , f ₁ , f ₂ , f ₃ , f ₄ } and the spectrum bandwidth connected to this wavelength is 50 GHz.

The link between node B and the downstream adjacent node C (from source node A to sink node C) is link BC. As shown in Figure 4b, the idle spectrum resource of link BC is 193.05625-193.11875THz, and the idle center The set of frequencies is {f ₋₇ , f ₋₆ , f ₋₅ , f ₋₄ , f ₋₃ , f ₋₂ , f ₋₁ , f ₀ , f ₁ , f ₂ , f ₃ }.

Set the free center frequencies of link AB {f _-9 , f _-8 , f _-7 , f _-6 , f _-5 , f _-4 , f _-3 , f _-2 , f _-1 , f ₀ , f ₁ , f ₂ , f ₃ , f ₄ } and the free center frequency set {f _-7 , f _-6 , f _-5 , f _-4 , f _-3 , f _-2 , f _-1 , f ₀ , f ₁ , f ₂ , f ₃ } take the intersection, and get the updated free center frequency set {f _-7 , f _-6 , f _-5 , f _-4 , f _-3 , f _-2 , f _-1 , f ₀ , f ₁ , f ₂ , f ₃ }, to obtain updated free center frequency set information corresponding to the updated free center frequency set.

Node B sends a request message to the downstream (that is, the direction from source node A to sink node C) adjacent node C, and the request message carries the updated free center frequency set information and spectrum bandwidth information, which in this embodiment is the free center frequency set{ f _-7 , f _-6 , f _-5 , f _-4 , f _-3 , f _-2 , f _-1 , f ₀ , f ₁ , f ₂ , f ₃ } and a spectral bandwidth of 50GHz. In addition, the request message may also carry display routing information (interface 5, interface 6).

Step S403, node C receives the request message, extracts the free center frequency set information and spectrum bandwidth information carried in the request message, and obtains the intersection of the free center frequency sets of all links through which the wavelength connection passes and the spectrum bandwidth of the wavelength connection; An available center frequency is obtained from the intersection of idle center frequency sets of all links as the center frequency of the wavelength connection, and a wavelength cross-connection is established based on the center frequency and spectrum bandwidth; a response message is sent to Node B, and the response message carries center frequency information.

Node C receives the request message sent by Node B, extracts the free center frequency set information and spectrum bandwidth information carried in the request message, and obtains the free center frequency set { f _-7 , f _-6 , f _-5 , f _-4 , f _-3 , f _-2 , f _-1 , f ₀ , f ₁ , f ₂ , f ₃ } and the spectrum bandwidth connected to this wavelength is 50GHz.

Node C obtains an available center frequency from the intersection of free center frequency sets of all links as the center frequency of the wavelength connection:

First, node C looks for a set of free center frequencies {f _-7 , f _-6 , f _-5 , f _-4 , f _-3 , f _-2 , f _-1 , f ₀ , f ₁ , f ₂ , f ₃ } Available center frequencies in . According to the spectrum bandwidth of 50 GHz, determine the frequency range covered by each free center frequency in the set of free center frequencies:

Lowest frequency = center frequency – spectral bandwidth/2;

Highest frequency = center frequency + spectrum bandwidth/2.

If the center frequencies included in the frequency range covered by an idle center frequency are all idle center frequencies, it is determined that the center frequency is an available center frequency.

For example: center frequency f _-7 = 193.05625THz covers a frequency range of 193.03125~193.08125THz, including center frequencies f _-11 , f _-10 , f _-9 , f _-8 , f _-7 , f _-6 , f _-5 , f _-4 , f _-3 , where f _-11 and f _-10 are not idle frequencies, then the center frequency f _-7 is not an available center frequency; the frequency range covered by the center frequency f _-3 = 193.08125THz is 193.05625～193.10625, including Center frequencies f _-7 , f _-6 , f _-5 , f _-4 , f _-3 , f _-2 , f _-1 , f ₀ , f ₁ are all free center frequencies, then center frequency f _-3 is available Center frequency. By analogy, node C obtains a set of available center frequencies, that is, all available center frequencies are {f ₋₃ , f ₋₂ , f ₋₁ }.

Node C obtains an available center frequency from all available center frequencies (that is, a set of available center frequencies) in a manner similar to step 303 in the second embodiment, and uses it as the center frequency of the wavelength connection. In this embodiment, node C selects f _-3 as the center frequency among all available center frequencies.

Node C sets the working frequency of the interface 6 as the center frequency f ₋₃ =193.1+(-3×6.25/1000)=193.08125 THz. According to the center frequency f _-3 and the spectrum bandwidth of 50 GHz, it is determined that the spectrum range occupied by the wavelength connection is 193.05625-193.10625 THz, and the wavelength crossing is established between the above spectrum ranges of interface 5 and interface 6.

The center frequency information corresponding to the center frequency f _-3 =193.08125 THz of the wavelength connection is obtained.

Node C sends an acknowledgment message to the upstream adjacent node B (that is, the direction from sink node C to source node A), and the acknowledgment message carries center frequency information, which is the center frequency f _-3 in this embodiment.

The implementation methods of steps S404 and S405 in this embodiment are similar to those of steps S304 and S305 in Embodiment 2, and will not be repeated here.

Embodiment 4: This embodiment of the present invention provides a method for establishing a wavelength cross-connect. In the WDM network shown in FIG. 5 , the connections between nodes A, B, C, D, and E represent optical fiber links, and node E has an OEO (Optical-Electrical-Optical, optical-electrical-optical conversion) function.

The network management or client notifies node A to establish the wavelength connection between node A interface 1 and node C interface 6 in Figure 5, the route of the wavelength connection is (A, D, E, C), that is (interface 1, interface 10, interface 9, interface 11, interface 12, interface 13, interface 14, interface 6), node A is the source node, node D is the intermediate node, and node C is the sink node. Node E is an OEO node and realizes the OEO function, that is, node E uses an electrical cross-connect to splice two wavelength segments A-E and E-C. The spectrum bandwidth requirement for segment connection A-E is 50 GHz, and the spectrum bandwidth requirement for segment connection E-C is 37.5 GHz. Segment connection A-E is a segment connection on the source node A side where node E is located, and segment connection E-C is a segment connection on the sink node C side where node E is located. The method specifically includes the following steps:

Step S501, node A determines the spectral bandwidth of each segment connection on the wavelength connection, obtains the set of available central frequencies of link A-D according to the spectral bandwidth of the segment connection A-E; sends a request message to node D, and the request message carries information about the set of available central frequencies and spectrum bandwidth information.

Node A determines that the spectrum bandwidth of the segment connection A-E on the wavelength connection is 50 GHz, and the spectrum bandwidth of the segment connection E-C is 37.5 GHz.

The link between node A and the downstream (that is, the direction from source node A to sink node C) adjacent node D is link AD. The set of frequencies is {f _-12 , f _-11 , f _-10 , f _-9 , f _-8 , f _-7 , f _-6 , f _-5 , f _-4 , f _-3 , f _-2 , f _{- 1} , f ₀ , f ₁ , f ₂ , f ₃ , f ₄ }.

Node A obtains the set of available center frequencies of the link AD as {f _-8 , f _-7 , f _-6 , f _-5 , f _-4 , f _-3 , f _-2 , f _-1 , f ₀ }.

The available center frequency set information corresponding to the available center frequency set of link A-D and the spectrum bandwidth information corresponding to the spectrum bandwidth of each segment connection (including segment connections A-E and E-C) in the wavelength connection are obtained.

Node A sends a request message to downstream node D, and the request message carries the spectrum bandwidth information of each section connection in the wavelength connection, in this embodiment, the spectrum bandwidth of section connection AE is 50 GHz and the spectrum bandwidth of section connection EC is 37.5 GHz. The request message also carries information about the set of available center frequencies, which in this embodiment is the set of available center frequencies {f _-8 , f _-7 , f _-6 , f _-5 , f _-4 , f _-3 , f _-2 , f _-1 , f ₀ }. In addition, the request message may also carry display routing information (interface 9, interface 11, interface 12, interface 13, interface 14, interface 6).

Step S502, node D receives the request message, extracts the available center frequency set information and spectrum bandwidth information carried in the request message; obtains the available center frequency set of link D-E according to the spectrum bandwidth of the segment connection A-E, and uses the available center frequency set of link D-E The frequency set is intersected with the available center frequency set of link A-D to obtain an updated available center frequency set; a request message is sent to node E, and the request message carries the spectrum bandwidth information of each segment connection and the updated available center frequency set information.

Node D receives the request message sent by node A, extracts the available central frequency set information and spectrum bandwidth information carried in the request message, and obtains the spectrum bandwidth of 50 GHz for the segment connection AE and 37.5 GHz for the segment connection EC, and the spectrum bandwidth of the segment connection AE A set of available center frequencies {f ₋₈ , f ₋₇ , f ₋₆ , f ₋₅ , f ₋₄ , f ₋₃ , f ₋₂ , f ₋₁ , f ₀ }.

The link between node D and the downstream (that is, the direction from source node A to sink node C) adjacent node E is link DE. As shown in Figure 6b, the idle spectrum resource of link DE is 193.0375-193.0625THz, and the idle center The set of frequencies is {f _-10 , f _-9 , f _-8 , f _-7 , f _-6 , f _-5 , f _-4 , f _-3 , f _-2 , f _-1 , f ₀ , f ₁ , f ₂ , f ₃ , f ₄ , f ₅ , f ₆ }.

Node D obtains the set of available center frequencies of link DE as {f- ₆ , f- ₅ , f _-4 , f _-3 , f _-2 , f _-1 , f ₀ , f ₁ , f ₂ }.

Combine the set of available center frequencies {f _-8 , f _-7 , f _-6 , f _-5 , f _-4 , f _-3 , f _-2 , f _-1 , f ₀ } of link AD with the Take the intersection of available center frequency sets {f _-6 , f _-5 , f _-4 , f _-3 , f _-2 , f _-1 , f ₀ , f ₁ , f ₂ } to get the updated available center of segment connection AE A set of frequencies {f ₋₆ , f ₋₅ , f ₋₄ , f ₋₃ , f ₋₂ , f ₋₁ , f ₀ }.

Node D sends a request message to downstream node E, and the request message carries the spectrum bandwidth information of the segment connection where node D is located and each segment connection downstream (that is, between node D and sink node C). In this embodiment, it is the segment connection AE The spectrum bandwidth is 50GHz and the spectrum bandwidth of the segment connection EC is 37.5GHz. The request message also carries the updated available central frequency set information of the segment connection AE, which in this embodiment is the updated available central frequency set {f _-6 , f _-5 , f _-4 , f _-3 , f _-2 , f _-1 , f ₀ }. In addition, the request message may also carry display routing information (interface 12, interface 13, interface 14, interface 6).

Step S503, node E receives the request message, extracts the available center frequency set information and spectrum bandwidth information carried in the request message, obtains the intersection of the available center frequency sets of all links passed by the segment connection A-E, and obtains the segment connection A-E and the segment connection The spectrum bandwidth of E-C; determine the center frequency of the segment connection A-E; obtain the available center frequency set of the link E-C according to the spectrum bandwidth of the segment connection E-C; send a request message to node C, and the request message carries the available center frequency set information and spectrum bandwidth information .

Node E receives the request message sent by node D, extracts the spectrum bandwidth information and available central frequency set information carried in the request message, and obtains the spectrum bandwidth of 50 GHz for the segment connection AE and 37.5 GHz for the segment connection EC, and the spectrum bandwidth of the segment connection AE A set of available center frequencies {f ₋₆ , f ₋₅ , f ₋₄ , f ₋₃ , f ₋₂ , f ₋₁ , f ₀ }.

The node E obtains an available center frequency from the set of available center frequencies as the center frequency of the segment connection AE in a manner similar to step 303 in the second embodiment. In _{this embodiment} , _{node E selects f -3 as} The segment connects to the center frequency of the AE.

The link between node E and the downstream (that is, the direction from source node A to sink node C) adjacent node C is link EC, as shown in Figure 6c, the idle spectrum resource of link EC is 193.075-193.15THz, and the idle center The frequencies are {f ₋₄ , f ₋₃ , f ₋₂ , f ₋₁ , f ₀ , f ₁ , f ₂ , f ₃ , f ₄ , f ₅ , f ₆ , f ₇ , f ₈ }.

Node E obtains the set of available center frequencies of the link EC as {f _-1 , f ₀ , f ₁ , f ₂ , f ₃ , f ₄ , f ₅ }.

The node E sends a request message to the downstream node C, and the request message carries the spectrum bandwidth information of each segment connection downstream of the node E, and in this embodiment, the spectrum bandwidth of the segment connection EC is 37.5 GHz. The request message also carries information about the set of available central frequencies of the downstream section connection where node E is located, which in this embodiment is the set of available central frequencies {f _-1 , f ₀ , f ₁ , f ₂ , f ₃ , f ₄ , f ₅ }. In addition, the request message may also carry display routing information (interface 14, interface 6).

Step S504, node C receives the request message, extracts the spectrum bandwidth information and available center frequency set information carried in the request message, and obtains the intersection of the spectrum bandwidth of the segment connection E-C and the available center frequency set of all links through which the segment connection E-C passes; Determine the center frequency of the segment connection E-C; establish a wavelength cross-connection based on the center frequency and spectrum bandwidth of the segment connection E-C; send a response message to node E, and the response message carries the center frequency information of the segment connection E-C.

Node C receives the request message sent by node E, extracts the spectrum bandwidth information and available center frequency set information carried in the request message, and obtains the spectrum bandwidth 37.5 GHz of the segment connection EC and the available center frequency set {f _-1 of the segment connection EC, f ₀ , f ₁ , f ₂ , f ₃ , f ₄ , f ₅ }.

Node C obtains an available center frequency from the set of available center frequencies as the center frequency of the segment connection EC in a manner similar to S303 in the second embodiment. In this embodiment, node C selects f _-2 from the set of available center frequencies as the center frequency of the segment connection EC.

Node C sets the working frequency of the interface 6 to the center frequency f _-2 of the EC segment connection =193.1+(-2×6.25/1000)=193.0875 THz. According to the center frequency f _-2 and the spectrum bandwidth of 37.5 GHz of the segment connection EC, it is determined that the spectrum range occupied by the segment connection is 193.06875 ~ 193.10625 THz, and the wavelength crossing is established between the above spectrum ranges of interface 14 and interface 6.

Node C sends a response message to the upstream node E, and the response message carries the center frequency information of the segment connection where node C is located, which is the center frequency f _-2 of the segment connection EC in this embodiment.

Step S505, node E receives the response message, extracts the center frequency information carried in the response message, and obtains the center frequency of the segment connection E-C; determines the spectrum range based on the center frequency and spectrum bandwidth of the segment connection A-E, and determines the spectrum range based on the center frequency and frequency of the segment connection E-C The spectrum bandwidth determines the spectrum range, and establishes a wavelength cross-connection between two segment connections; sends a response message to node D, and the response message carries center frequency information.

Node E receives the response message sent by node C, extracts the center frequency information carried in the response message, and obtains the center frequency f _-2 of the segment connection EC.

The node E sets the working frequency of the interface 13 to the center frequency f ₋₂ of the segment connection EC = 193.1 + (-2×6.25/1000) = 193.0625 THz. According to the center frequency f _-2 of the segment connection EC and the spectrum bandwidth of 37.5 GHz, it is determined that the spectrum occupied by the segment connection EC is in the range of 193.06875-193.10625 THz.

The node E sets the working frequency of the interface 12 to the center frequency f _-3 =193.1+(-3×6.25/1000)=193.08125 THz of the segment connection AE. According to the center frequency f _-3 of the section connection AE and the spectrum bandwidth of 50 GHz, it is determined that the spectrum occupied by the section connection AE is in the range of 193.05625-193.10625 THz.

Establish wavelength crossing between the spectrum range 193.05625-193.10625 THz occupied by the segment connection A-E and the spectrum range 193.06875-193.10625 THz occupied by the segment connection E-C.

The node E sends a response message to the upstream node D, and the response message carries the central frequency information of the upstream segment connection where the node E is located, which is the central frequency information f _-3 of the segment connection AE in this embodiment.

Step S506, node D receives the response message, extracts the spectrum bandwidth information carried in the response message, obtains the center frequency of the segment connection A-E, and establishes a wavelength cross-connection based on the center frequency of the segment connection A-E and the spectrum range determined by the spectrum bandwidth; A response message is sent, and the response message carries the center frequency information of the segment connection A-E.

Node D receives the response message sent by node E, extracts the center frequency information carried in the response message, and obtains the center frequency f _-3 of the segment connection AE. According to the center frequency f _-3 spectrum bandwidth of the segment connection AE is 50 GHz, determine that the spectrum range occupied by the segment connection AE is 193.05625-193.10625 THz, and establish wavelength crossing between the above spectrum ranges of interface 9 and interface 11.

Node D sends a response message to upstream node A, and the response message carries center frequency information, which is the center frequency information f _-3 of segment connection AE in this embodiment.

Step S507, node A receives the response message, extracts the center frequency information carried in the response message, obtains the center frequency of the segment connection A-E, and establishes a wavelength cross-connection based on the center frequency of the segment connection A-E and the spectrum range determined by the spectrum bandwidth.

Node A receives the response message sent by node D, extracts the center frequency information carried in the response message, and obtains the center frequency f _-3 of the segment connection AE.

Node A sets the working frequency of interface 1 to the center frequency f _-3 =193.1+(-3×6.25/1000)=193.08125 THz of the segment connection AE. According to the center frequency f _-3 of the segment connection and the spectrum bandwidth of 50 GHz, the spectrum range occupied by the segment connection AE is determined to be 193.05625-193.10625 THz, and the wavelength crossing is established between the above spectrum ranges of interface 1 and interface 10.

Embodiment 5: This embodiment of the present invention provides a method for establishing a wavelength cross-connect. In the WDM network shown in FIG. 5 , the connections between nodes A, B, C, D, and E represent optical fiber links, and node E has an OEO (optical-electrical-optical conversion) function.

The network management or client notifies node A to establish the wavelength connection between node A interface 1 and node C interface 6 in Figure 5, the route of the wavelength connection is (A, D, E, C), that is (interface 1, interface 10, interface 9, interface 11, interface 12, interface 13, interface 14, interface 6), node A is the source node, node D is the intermediate node, and node C is the sink node. Node E is an OEO node and realizes the OEO function, that is, node E uses an electrical cross-connect to splice two wavelength connections A-E and E-C. The spectrum bandwidth requirement for segment connection A-E is 50 GHz, and the spectrum bandwidth requirement for segment connection E-C is 37.5 GHz. Segment connection A-E is a segment connection on the source node A side where node E is located, and segment connection E-C is a segment connection on the sink node C side where node E is located. The method specifically includes the following steps:

In step S601, node A determines the spectrum bandwidth of each segment connection on the wavelength connection, and sends a request message to node D, where the request message carries spectrum bandwidth information and available central frequency set information.

Node A determines that the spectrum bandwidth of the segment connection A-E on the wavelength connection is 50 GHz, and the spectrum bandwidth of the segment connection E-C is 37.5 GHz.

The link between node A and the downstream (that is, the direction from source node A to sink node C) adjacent node D is link AD. The set of frequencies is {f _-12 , f _-11 , f _-10 , f _-9 , f _-8 , f _-7 , f _-6 , f _-5 , f _-4 , f _-3 , f _-2 , f _{- 1} , f ₀ , f ₁ , f ₂ , f ₃ , f ₄ }.

Node A sends a request message to downstream node D, and the request message carries the spectrum bandwidth information of each section connection in the wavelength connection, in this embodiment, the spectrum bandwidth of section connection AE is 50 GHz and the spectrum bandwidth of section connection EC is 37.5 GHz. The request message also carries the free central frequency set information of the segment connection where node A is located. In this embodiment, it is the free central frequency set {f _-12 , f _-11 , f _-10 , f _-9 , f _-8 of the segment connection AE , f _-7 , f _-6 , f _-5 , f _-4 , f _-3 , f _-2 , f _-1 , f ₀ , f ₁ , f ₂ , f ₃ , f ₄ }. In addition, the request message may also carry display routing information (interface 9, interface 11, interface 12, interface 13, interface 14, interface 6).

Step S602, node D receives the request message, extracts the spectrum bandwidth information and available center frequency set information carried in the request message; takes the intersection of the free center frequency set of link D-E and the free center frequency set of link A-D, and obtains the updated A set of available central frequencies; a request message is sent to the node E, and the request message carries spectrum bandwidth information and updated free central frequency set information.

Node D receives the request message sent by node A, extracts the spectrum bandwidth information and free center frequency set information carried in the request message, and obtains the spectrum bandwidth of 50 GHz for the segment connection AE and 37.5 GHz for the segment connection EC, and the spectrum bandwidth of the segment connection AE Set of free center frequencies {f _-12 , f _-11 , f _-10 , f _-9 , f _-8 , f _-7 , f _-6 , f _-5 , f _-4 , f _-3 , f _-2 , f _-1 , f ₀ , f ₁ , f ₂ , f ₃ , f ₄ }.

The link between node D and the downstream (that is, the direction from source node A to sink node C) adjacent node E is link DE. As shown in Figure 6b, the idle spectrum resource of link DE is 193.0375-193.0625THz, and the idle center The set of frequencies is {f _-10 , f _-9 , f _-8 , f _-7 , f _-6 , f _-5 , f _-4 , f _-3 , f _-2 , f _-1 , f ₀ , f ₁ , f ₂ , f ₃ , f ₄ , f ₅ , f ₆ }.

Set the free center frequencies of links AD {f _-12 , f _-11 , f _-10 , f _-9 , f _-8 , f _-7 , f _-6 , f _-5 , f _-4 , f _-3 , f _-2 , f _-1 , f ₀ , f ₁ , f ₂ , f ₃ , f ₄ } and the free center frequency set of link DE {f _-10 , f _-9 , f _-8 , f _-7 , f _-6 , f _-5 , f _-4 , f _-3 , f _-2 , f _-1 , f ₀ , f ₁ , f ₂ , f ₃ , f ₄ , f ₅ , f ₆ } take the intersection and get the updated The free center frequency set of segment connection AE {f _-10 , f _-9 , f _-8 , f _-7 , f _-6 , f _-5 , f _-4 , f _-3 , f _-2 , f _-1 , f ₀ , f ₁ , f ₂ , f ₃ , f ₄ }.

Node D sends a request message to downstream node E, and the request message carries the spectrum bandwidth information of the segment connection where node D is located and each segment connection downstream (that is, between node D and sink node C). In this embodiment, it is the segment connection AE The spectrum bandwidth is 50GHz and the spectrum bandwidth of the segment connection EC is 37.5GHz. The request message also carries the updated free center frequency set information of the segment connection AE, which in this embodiment is the free center frequency set {f _-10 , f _-9 , f _-8 , f _-7 , f _-6 , f _-5 , f _-4 , f _-3 , f _-2 , f _-1 , f ₀ , f ₁ , f ₂ , f ₃ , f ₄ }. In addition, the request message may also carry display routing information (interface 12, interface 13, interface 14, interface 6).

Step S603, node E receives the request message, extracts the spectrum bandwidth information and available center frequency set information carried in the request message, obtains the intersection of the free center frequency sets of all links through which segment connection A-E passes, and obtains segment connection A-E and segment connection Spectrum bandwidth of E-C; determine the central frequency of the first connection; send a request message to node C, and the request message carries idle central frequency set information and spectrum bandwidth information.

Node E receives the request message sent by node D, extracts the spectrum bandwidth information and available central frequency set information carried in the request message, and obtains the spectrum bandwidth of 50 GHz for the segment connection AE and 37.5 GHz for the segment connection EC, and the spectrum bandwidth of the segment connection AE Set of free center frequencies {f _-10 , f _-9 , f _-8 , f _-7 , f _-6 , f _-5 , f _-4 , f _-3 , f _-2 , f _-1 , f ₀ , f ₁ , f ₂ , f ₃ , f ₄ }.

Node E acquires an available center frequency in the free center frequency set as the center frequency of the segment connection AE in a manner similar to step 403 in the third embodiment. First find the available center frequencies in the set of free center frequencies, and then obtain an available center frequency among all available center frequencies {f _-6 , f _-5 , f _-4 , f _-3 , f _-2 , f _-1 , f ₀ } The center frequency is used as the center frequency of the segment connection AE. In this embodiment, the node E selects f _-3 as the center frequency of the segment connection AE from the free center frequency set of the segment connection AE.

The link between node E and the downstream (that is, the direction from source node A to sink node C) adjacent node C is link EC, as shown in Figure 6c, the idle spectrum resource of link EC is 193.075-193.15THz, and the idle center The frequencies are {f ₋₄ , f ₋₃ , f ₋₂ , f ₋₁ , f ₀ , f ₁ , f ₂ , f ₃ , f ₄ , f ₅ , f ₆ , f ₇ , f ₈ }.

The node E sends a request message to the downstream node C, and the request message carries the spectrum bandwidth information of each segment connection downstream of the node E, and in this embodiment, the spectrum bandwidth of the segment connection EC is 37.5 GHz. The request message also carries information about the free central frequency set of the downstream segment connection where the node E is located. In this embodiment, it is the free central frequency set {f _-4 , f _-3 , f _-2 , f _-1 , f ₀ of the segment connection EC , f ₁ , f ₂ , f ₃ , f ₄ , f ₅ , f ₆ , f ₇ , f ₈ }. In addition, the request message may also carry display routing information (interface 14, interface 6).

Step S604, node C receives the request message, extracts the spectrum bandwidth information and available center frequency set information carried in the request message, and obtains the intersection of the spectrum bandwidth of the segment connection E-C and the free center frequency set of all links through which the segment connection E-C passes; Determine the center frequency of the segment connection E-C, establish a wavelength cross-connection based on the center frequency and spectrum bandwidth of the segment connection E-C; send a response message to node E, and the response message carries the center frequency information of the segment connection E-C.

Node C receives the request message sent by node E, extracts the spectrum bandwidth information and idle center frequency set information carried in the request message, and obtains the spectrum bandwidth 37.5 GHz of the segment connection EC and the idle center frequency set {f _-4 of the segment connection EC, f ₋₃ , f ₋₂ , f ₋₁ , f ₀ , f ₁ , f ₂ , f ₃ , f ₄ , f ₅ , f ₆ , f ₇ , f ₈ }.

Node C obtains an available center frequency in the free center frequency set as the center frequency of the segment connection EC in a manner similar to S403 in the third embodiment. First find the available center frequency in the free center frequency set, and then obtain an available center frequency among all available center frequencies {f _-1 , f ₀ , f ₁ , f ₂ , f ₃ , f ₄ , f ₅ } as a segment connection EC center frequency. In this embodiment, node C selects f _-2 from the set of available center frequencies as the center frequency of the segment connection EC.

Node C sets the working frequency of the interface 6 to the center frequency f _-2 of the EC segment connection =193.1+(-2×6.25/1000)=193.0875 THz. According to the center frequency f _-2 and the spectrum bandwidth of 37.5 GHz of the segment connection EC, it is determined that the spectrum range occupied by the segment connection is 193.06875 ~ 193.10625 THz, and the wavelength crossing is established between the above spectrum ranges of interface 14 and interface 6.

Node C sends a response message to the upstream node E, and the response message carries the center frequency information of the segment connection where node C is located, which is the center frequency f _-2 of the segment connection EC in this embodiment.

Steps S605 , S606 , and S607 in this embodiment are similar to the implementation methods of steps S505 , S506 , and S507 in Embodiment 4, and will not be repeated here.

The route of the wavelength connection may contain one or more OEO nodes. Embodiments 4 and 5 describe the case where the route of the wavelength connection contains one OEO node. For the case where there are multiple OEO nodes between the source node and the sink node , the processing of each OEO node is similar to the processing of the OEO node described in Embodiment 4 and Embodiment 5, and will not be repeated here. Between the source node and the OEO node, between the OEO node and the sink node, and between the OEO nodes may not contain an intermediate node, or may contain one or more intermediate nodes, which are not limited in this embodiment of the present invention.

A method for establishing a wavelength cross-connection provided by an embodiment of the present invention can automatically establish a wavelength cross-connection with a variable spectrum bandwidth on a node, and is simple to implement and highly reliable.

Embodiment 6, the embodiment of the present invention provides a node device, as shown in FIG. 8, including:

The first processing module 801: used to determine the spectral bandwidth of the wavelength connection, and obtain the first available center frequency set of the first link according to the spectral bandwidth; the first link is the node and the adjacent node in the direction from the node to the second node. The link between; it is also used to obtain the first available central frequency set information corresponding to the first available central frequency set and the spectral bandwidth information corresponding to the spectral bandwidth; it is also used to obtain the central frequency of the wavelength connection; the central frequency is the second node at An available center frequency obtained from the second set of available center frequencies; the second set of available center frequencies is the intersection of the sets of available center frequencies of all links through which the wavelength connection passes;

The first sending module 802: used to send a request message carrying the first available center frequency set information and spectrum bandwidth information to the adjacent node in the direction from the current node to the second node;

The first receiving module 803: for receiving the response message, and extracting the center frequency information carried in the response message;

The first cross-connect establishing module 804: configured to establish a wavelength cross-connect in the spectrum range determined based on the center frequency and the spectrum bandwidth.

Embodiment 7, the embodiment of the present invention provides a node device, as shown in FIG. 9, including:

The second receiving module 901 is configured to receive the request message, and extract the second available central frequency set information and spectrum bandwidth information carried in the request message; the second available central frequency set is the available central frequency set of all links through which the wavelength connection passes intersection;

The second processing module 902 is configured to obtain the second set of available center frequencies and the spectral bandwidth of the wavelength connection determined by the first node; and is also used to obtain an available center frequency in the second set of available center frequencies as the center frequency of the wavelength connection;

The second cross-connection establishing module 903 is configured to establish a wavelength cross-connection based on the spectrum range determined by the center frequency and the spectrum bandwidth.

Embodiment 8. The embodiment of the present invention provides a node device, as shown in FIG. 10 , including:

The third receiving module 1001 is configured to receive the request message, and extract the third available center frequency set information and spectrum bandwidth information carried in the request message; it is also used to receive the response message, and extract the center frequency information carried in the response message;

The third processing module 1002 is configured to obtain the third available center frequency set and the spectral bandwidth of the wavelength connection determined by the first node; the third available center frequency set is all links between the first node and the current node through which the wavelength connection passes The intersection of the available center frequency sets; it is also used to obtain the available center frequency set of the second link according to the spectrum bandwidth, and the intersection of the available center frequency set of the second link and the third available center frequency set to obtain the fourth available center frequency Set, obtain the fourth available center frequency set information corresponding to the fourth available center frequency set; the second link is the link between the node and the adjacent node in the direction from the first node to the second node; it is also used to obtain the wavelength connection center frequency; the center frequency is an available center frequency obtained by the second node in the second set of available center frequencies; the second set of available center frequencies is the intersection of the set of available center frequencies of all links through which the wavelength connection passes;

The third sending module 1003 is configured to send a request message carrying fourth available center frequency set information and spectrum bandwidth information to adjacent nodes in the direction from the first node to the second node;

The third cross-connection establishment module 1004 is configured to establish a wavelength cross-connection based on the spectrum range determined by the central frequency and the spectrum bandwidth.

Embodiment 9, the embodiment of the present invention provides a node device, as shown in FIG. 8, including:

The first processing module 801 is configured to determine the spectral bandwidth of the wavelength connection, and obtain the first idle central frequency set information corresponding to the first idle central frequency set of the third link and the spectral bandwidth information corresponding to the spectral bandwidth; the third link is The link between the first node and the adjacent nodes in the direction from the first node to the second node; it is also used to obtain the center frequency of the wavelength connection; the center frequency is obtained by the second node in the second idle center frequency set according to the spectrum bandwidth An available center frequency; the second free center frequency set is the intersection of the free center frequency sets of all links through which the wavelength is connected;

The first sending module 802 is configured to send a request message carrying first free center frequency set information and spectrum bandwidth information to adjacent nodes in the direction from the first node to the second node;

The first receiving module 803 is configured to receive the response message, and extract the center frequency information carried in the response message;

The first cross-connection establishing module 804 is configured to establish a wavelength cross-connection based on the spectrum range determined by the center frequency and the spectrum bandwidth.

Embodiment 10. The embodiment of the present invention provides a node device, as shown in FIG. 9, including:

The second receiving module 901 is configured to receive the request message, and extract the second free center frequency set information and spectrum bandwidth information carried in the request message;

The second processing module 902 is configured to obtain a second idle center frequency set and the spectral bandwidth of the wavelength connection determined by the first node; the second idle center frequency set is an intersection set of idle center frequency sets of all links through which the wavelength connection passes; It is used to obtain an available center frequency in the second free center frequency set according to the spectrum bandwidth as the center frequency of the wavelength connection;

The second cross-connection establishing module 903 is configured to establish a wavelength cross-connection based on the spectrum range determined by the center frequency and the spectrum bandwidth.

Embodiment 11. The embodiment of the present invention provides a node device, as shown in FIG. 10 , including:

The third receiving module 1001 is configured to receive a request message, and extract the third free center frequency set information and spectrum bandwidth information carried in the request message; it is also used to receive a response message, and extract the center frequency information carried in the response message;

The third processing module 1002 is configured to obtain a third idle central frequency set and the spectral bandwidth of the wavelength connection determined by the first node; the third idle central frequency set is all links between the first node and the current node through which the wavelength connection passes The intersection of the idle central frequency set; it is also used to intersect the idle central frequency set of the fourth link with the third idle central frequency set to obtain the fourth idle central frequency set and obtain the fourth idle central frequency set corresponding to the fourth idle central frequency set. Center frequency collection information; the fourth link is the link between the node and the adjacent node in the direction from the first node to the second node; it is also used to obtain the center frequency of the wavelength connection; the center frequency is the second node according to the spectrum bandwidth in the An available center frequency obtained in the second free center frequency set; the second free center frequency set is the intersection of the free center frequency sets of all links through which the wavelength is connected;

The third sending module 1003 is configured to send a request message carrying fourth free central frequency set information and spectrum bandwidth information to adjacent nodes in the direction from the first node to the second node;

The third cross-connection establishment module 1004 is configured to establish a wavelength cross-connection based on the spectrum range determined by the central frequency and the spectrum bandwidth.

Embodiment 12. The embodiment of the present invention provides a node device, as shown in FIG. 8, including:

The first processing module 801 is configured to determine the spectral bandwidth of each segment connection on the wavelength connection, and obtain the fifth available center frequency set of the fifth link according to the spectral bandwidth of the segment connection where the first node is located; the fifth link is the first The link between the node and the adjacent node in the direction from the node to the second node; it is also used to obtain the fifth available central frequency set information corresponding to the fifth available central frequency set and the spectral bandwidth corresponding to each segment connection on the wavelength connection Spectrum bandwidth information;

The first sending module 802 is configured to send a request message carrying fifth available central frequency set information and spectrum bandwidth information to adjacent nodes in the direction from the current node to the second node; it is also used to obtain the central frequency of the segment connection where the current node is located; The center frequency is an available center frequency obtained by the fourth node between the node and the second node in the sixth available center frequency set; the sixth available center frequency set is the available center frequency set of all links connected to the section where the node is located the intersection of

The first receiving module 803 is configured to receive the response message, and extract the first center frequency information carried in the response message;

The first cross-connection establishment module 804 is configured to establish a wavelength cross-connection based on the spectrum range determined by the center frequency and the spectrum bandwidth of the section connection where the node is located.

Embodiment 13, the embodiment of the present invention provides a node device, as shown in FIG. 9, including:

The second receiving module 901 is configured to receive the request message, and extract the ninth available central frequency set information and spectrum bandwidth information carried in the request message;

The second processing module 902 is used to obtain the ninth set of available center frequencies and the spectrum bandwidth of the connection of the section where the node is located as determined by the first node; the ninth set of available center frequencies is the available center of all links through which the section connection of the node is located The intersection of the frequency sets; it is also used to obtain an available center frequency in the ninth available center frequency set as the center frequency of the segment connection where the node is located;

The second cross-connection establishment module 903 is configured to establish a wavelength cross-connection based on the spectrum range determined by the central frequency and the spectrum bandwidth of the section connection where the node is located.

Embodiment 14. The embodiment of the present invention provides a node device, as shown in FIG. 11 , including:

The fourth receiving module 1101 is configured to receive a request message, and extract the sixth available center frequency set information and the first spectrum bandwidth information carried in the request message; it is also used to receive a response message, and extract the second center frequency information carried in the response message ;

The fourth processing module 1102 is configured to obtain the sixth available center frequency set, obtain the side segment connection of the first node where the node is located and the spectrum bandwidth of each segment connection between the node and the second node determined by the first node; the sixth The set of available center frequencies is the intersection of the sets of available center frequencies of all the links through which the side section of the first node where the node is located; it is also used to obtain an available center frequency in the sixth set of available center frequencies as the node where the node is located. The center frequency of the side section connection of the first node; it is also used to obtain the seventh available center frequency set of the sixth link according to the spectrum bandwidth of the side section connection of the second node where the node is located; the sixth link is the connection between the node and the first node. The link between the adjacent nodes in the direction from the node to the second node; obtain the information of the seventh available center frequency set corresponding to the seventh available center frequency set, and obtain the information corresponding to the spectrum bandwidth of each segment connection between the node and the second node. Two spectrum bandwidth information; also used to obtain the center frequency of the side section connection of the second node where the node is located; the center frequency of the side section connection of the second node where the node is located is an available center frequency in the eighth available center frequency set; The eighth available central frequency set is the intersection of available central frequency sets of all links through which the second node side section connection where the fourth node is located;

The fourth sending module 1103 is configured to send a request message carrying the seventh available central frequency set information and the second spectrum bandwidth information to adjacent nodes in the direction from the first node to the second node;

The fourth cross establishment module 1104 is configured to determine the first spectrum range based on the center frequency and spectrum bandwidth of the side connection of the first node where the node is located, and determine the first spectrum range based on the center frequency and spectrum bandwidth of the side connection of the second node where the node is located In the second spectrum range, a wavelength cross-connection is established between the first spectrum range and the second spectrum range.

Embodiment 15. The embodiment of the present invention provides a node device, as shown in FIG. 10 , including:

The third receiving module 1001 is configured to receive the request message, and extract the tenth available center frequency set information and spectrum bandwidth information carried in the request message; it is also used to receive the response message, and extract the third center frequency information carried in the response message;

The third processing module 1002 is used to obtain the ninth set of available center frequencies, and obtain the segment connection where the third node is determined by the first node and the spectrum bandwidth of each segment connection between this node and the second node; the ninth set of available center frequencies It is the intersection of the available central frequency sets of all the links between the first node or the fourth node and the node where the node is connected to; it is also used to obtain the available frequency of the seventh link according to the spectrum bandwidth of the node where the node is connected. The central frequency set is the intersection of the available central frequency set of the seventh link and the tenth available central frequency set to obtain the eleventh available central frequency set, and the eleventh available central frequency set corresponding to the eleventh available central frequency set is obtained Information; the seventh link is the link between the third node and the adjacent node in the direction from the first node to the second node; it is also used to obtain the center frequency of the connection where the node is located; the center frequency is the link between the node and the second node An available center frequency obtained by the fourth node or the second node in the eleventh available center frequency set; the eleventh available center frequency set is the intersection of the available center frequency sets of all links connected to the segment where the third node is located ;

The third sending module 1003 is configured to send a request message carrying eleventh available central frequency set information and spectrum bandwidth information to adjacent nodes in the direction from the first node to the second node;

The third cross-connection establishment module 1004 is configured to establish a wavelength cross-connection based on the spectrum range determined by the central frequency and the spectrum bandwidth of the section connection where the node is located.

Embodiment 16. The embodiment of the present invention provides a node device, as shown in FIG. 8, including:

The first processing module 801 is configured to determine the spectral bandwidth of each segment connection on the wavelength connection, obtain the fifth idle center frequency set information corresponding to the fifth idle center frequency set of the eighth link and the information of each segment connection on the wavelength connection Spectrum bandwidth information corresponding to the spectrum bandwidth; the eighth link is the link between this node and the adjacent node in the direction from this node to the second node; it is also used to obtain the center frequency of the connection where the node is located; the center frequency is the node Between the second node and the second node, the fourth node obtains an available center frequency in the sixth free center frequency set according to the spectrum bandwidth connected to the segment where the first node is located; the sixth idle center frequency set is all links through which the node is located. The intersection of free center frequency combinations of ;

The first sending module 802 is configured to send a request message carrying fifth free central frequency set information and spectrum bandwidth information to adjacent nodes in the direction from the current node to the second node;

The first receiving module 803 is configured to receive the response message, and extract the fifth center frequency information carried in the response message;

The first cross-connection establishment module 804 is configured to establish a wavelength cross-connection based on the spectrum range determined by the center frequency and the spectrum bandwidth of the section connection where the node is located.

Embodiment 17. The embodiment of the present invention provides a node device, as shown in FIG. 9, including:

The second receiving module 901 is configured to receive the request message, and extract the ninth idle center frequency set information and spectrum bandwidth information carried in the request message;

The second processing module 902 is used to obtain the ninth set of idle central frequencies, and obtain the spectrum bandwidth of the connection of the section where the node is located as determined by the first node; the ninth set of idle central frequencies is the free space of all links through which the section of the node is connected. The intersection of the center frequency sets; it is also used to obtain an available center frequency in the ninth free center frequency set according to the spectral bandwidth of the segment connection where the node is located, as the center frequency of the segment connection where the node is located;

The second cross-connection establishment module 903 is configured to establish a wavelength cross-connection based on the spectrum range determined by the central frequency and the spectrum bandwidth of the section connection where the node is located.

Embodiment 18. The embodiment of the present invention provides a node device, as shown in FIG. 11 , including:

The fourth receiving module 1101 is configured to receive the request message, and extract the sixth idle center frequency set information and the third spectrum bandwidth information carried in the request message; it is also used to receive the response message, and extract the sixth center frequency information carried in the response message ;

The fourth processing module 1102 is used to obtain the sixth free central frequency set, and obtain the spectral bandwidth of the side segment connection of the first node where the node is located and each segment connection between the current node and the second node; the sixth free central frequency set is The intersection of the free center frequency sets of all links passed by the side section connection of the first node where the node is located; it is also used to obtain one of the sixth free center frequency sets according to the spectrum bandwidth of the side section connection of the first node where the node is located The center frequency can be used as the center frequency of the side section connection of the first node where the node is located; it is also used to obtain the information of the seventh idle center frequency set corresponding to the seventh idle center frequency set of the ninth link, and obtain the information from the node to the second node. The fourth spectral bandwidth information corresponding to the spectral bandwidth of each segment connection between nodes; the ninth link is the link between this point and the adjacent node in the direction from the first node to the second node; it is also used to obtain the location of the fourth node The center frequency of the side-section connection of the second node where this node is located; the center frequency of the side-section connection of the second node where this node is located is an available center frequency in the eighth free center frequency set; the eighth free center frequency set is the first free center frequency set where this node is located The intersection of the set of available center frequencies of all the links through which the two-node side section is connected;

The fourth sending module 1103 is configured to send a request message carrying information about the seventh free central frequency set and fourth spectrum bandwidth information to adjacent nodes in the direction from the first node to the second node;

The fourth cross establishment module 1104 is configured to determine the third spectrum range based on the center frequency and spectrum bandwidth of the side-section connection of the first node where the node is located, and determine the third spectrum range based on the center frequency and spectrum bandwidth of the side-section connection of the second node where the node is located The fourth spectrum range, and a wavelength cross-connection is established between the third spectrum range and the fourth spectrum range.

Embodiment 19. The embodiment of the present invention provides a node device, as shown in FIG. 10 , including:

The third receiving module 1001 is configured to receive a request message, and extract the tenth free center frequency set information and spectrum bandwidth information carried in the request message; it is also used to receive a response message, and extract the center frequency information carried in the response message;

The third processing module 1002 is used to obtain the tenth idle central frequency set, and obtain the segment connection where the node is located and the spectrum bandwidth of each segment connection between the own node and the second node determined by the first node; the tenth idle central frequency set is: The intersection of the free central frequency sets of all links between the first node or the fourth node and the current node through which the node is located; it is also used to combine the free central frequency set of the tenth link with the tenth free central frequency set Take the intersection to obtain the eleventh free center frequency set, and obtain the eleventh free center frequency set information corresponding to the eleventh free center frequency set; the tenth link is the adjacent node in the direction from the first node to the second node The link between nodes; it is also used to obtain the center frequency of the connection of the section where the node is located; the center frequency is the fourth node between the node and the second node or the second node is in the eleventh node according to the spectrum bandwidth of the section where the node is connected. An available center frequency obtained from the free center frequency set; the eleventh free center frequency set is the intersection of the free center frequencies of all links connected through the section where the node is located;

The third sending module 1003 is configured to send a request message carrying the eleventh free center frequency set information and the segment connection and spectrum bandwidth information of the node to the adjacent node in the direction from the first node to the second node;

The third cross-connection establishment module 1004 is configured to establish a wavelength cross-connection based on the spectrum range determined by the central frequency and the spectrum bandwidth of the section connection where the node is located.

The information interaction and execution process between the modules in the six to nineteenth embodiments above are based on the same idea as the method embodiment of the present invention, and the specific content can refer to the description in the method embodiment of the present invention. Here No longer.

A node device for establishing a wavelength cross-connection provided by an embodiment of the present invention can automatically establish a wavelength cross-connection with a variable spectral bandwidth on a node, and is simple to implement and has high reliability.

Embodiment 20. This embodiment of the present invention provides a system for establishing a wavelength cross-connection, as shown in FIG. 12 , at least including a first node 1201 and a second node 1202:

The first node 1201 includes: a first processing module, a first sending module, a first receiving module, and a first cross establishment module. For details, refer to the first processing module 801, the first sending module 802, and the first receiving module in Embodiment 6. The module 803 and the first cross establishment module 804 will not be repeated here.

The second node 1202 includes: a second receiving module, a second processing module, and a second cross establishment module. For details, refer to the second receiving module 901, the second processing module 902, and the second cross establishment module 903 in Embodiment 7. Here I won't repeat them here.

There may also be a third node 1203 between the first node 1201 and the second node 1202, specifically:

The third node 1203 includes: a third receiving module, a third processing module, a third sending module, and a third cross-connection establishment module. For details, refer to the third receiving module 1001, the third processing module 1002, and the third sending module in Embodiment 8. The module 1003 and the third cross establishment module 1004 will not be repeated here.

Embodiment 21. This embodiment of the present invention provides a system for establishing a wavelength cross-connection, as shown in FIG. 12 , including at least a first node 1201 and a second node 1202:

The first node 1201 includes: a first processing module, a first sending module, a first receiving module, and a first cross establishment module. For details, refer to the first processing module 801, the first sending module 802, and the first receiving module in Embodiment 9. The module 803 and the first cross establishment module 804 will not be repeated here.

The second node 1202 includes: a second receiving module, a second processing module, and a second cross-connection establishment module. For details, refer to the second reception module 901, the second processing module 902, and the second cross-connection establishment module 903 in Embodiment 10. Here I won't repeat them here.

There may also be a third node 1203 between the first node 1201 and the second node 1202, specifically:

The third node 1203 includes: a third receiving module, a third processing module, a third sending module, and a third cross connection establishment module. For details, refer to the third receiving module 1001, the third processing module 1002, the third The sending module 1003 and the third cross-connection establishing module 1004 are not repeated here.

Embodiment 22. This embodiment of the present invention provides a system for establishing a wavelength cross-connection, as shown in FIG. 13, at least including a first node 1301, a second node 1302, and a fourth node 1303:

The first node 1301 includes: a first processing module, a first sending module, a first receiving module, and a first cross establishment module. For details, refer to the first processing module 801, the first sending module 802, the first The receiving module 803 and the first cross establishing module 804 are not described in detail here.

The fourth node 1303 includes: a fourth receiving module, a fourth processing module, a fourth sending module, and a fourth cross-connection establishment module. For details, refer to the fourth receiving module 1101, the fourth processing module 1102, the fourth The sending module 1103 and the fourth cross-connection establishing module 1104 are not repeated here.

The second node 1302 includes: a second receiving module, a second processing module, and a second cross-connection establishment module. For details, refer to the second reception module 901, the second processing module 902, and the second cross-connection establishment module 903 in Embodiment 13. I won't repeat them here.

There may also be a third node 1304 between the first node 1301 and the second node 1302, specifically:

The third node 1304 includes: a third receiving module, a third processing module, a third sending module, and a third cross establishment module. For details, refer to the third receiving module 1001, the third processing module 1002, the third The sending module 1003 and the third cross-connection establishing module 1004 are not repeated here.

Embodiment 23, this embodiment of the present invention provides a system for establishing a wavelength cross-connection, as shown in FIG. 13 , at least including a first node 1301, a second node 1302, and a fourth node 1303:

The first node 1301 includes a first processing module, a first sending module, a first receiving module, and a first cross establishment module. For details, refer to the first processing module 801, the first sending module 802, and the first receiving module in Embodiment 16. The module 803 and the first cross establishment module 804 will not be repeated here.

The fourth node 1303 includes: a fourth receiving module, a fourth processing module, a fourth sending module, and a fourth cross establishment module. For details, refer to the fourth receiving module 1101, the fourth processing module 1102, the fourth The sending module 1103 and the fourth cross-connection establishing module 1104 are not repeated here.

The second node 1302 includes a second receiving module, a second processing module, and a second cross establishing module. For details, refer to the second receiving module 901, the second processing module 902, and the second cross establishing module 903 in Embodiment 17. Here I won't repeat them here.

There may also be a third node 1304 between the first node 1301 and the second node 1302, specifically:

The third node 1304, the third receiving module, the third processing module, the third sending module, and the third cross establishment module, for details, refer to the third receiving module 1001, the third processing module 1002, and the third sending module in Embodiment 19 1003. The third cross-connection establishment module 1004, which will not be repeated here.

By adopting the foregoing embodiments, automatic configuration of unidirectional wavelength crossing or bidirectional wavelength crossing can be realized. When configuring bidirectional wavelength crossing, the central frequency in the above embodiment is the bidirectional central frequency, and the spectral bandwidth is the bidirectional spectral bandwidth; when configuring unidirectional wavelength crossing, the central frequency in the above embodiment is the unidirectional central frequency, and the spectral bandwidth is unidirectional Spectrum bandwidth.

The response message in the foregoing embodiments may or may not carry spectrum bandwidth information. If the received response message carries spectrum bandwidth information, it needs to be checked against the spectrum bandwidth information carried in the request message, and only when the two are consistent will the subsequent steps be performed.

The route of the wavelength connection may only include the source node and the sink node, without including the intermediate node; or may include the source node, the sink node, and one or more intermediate nodes. The above embodiment describes the case where there is one intermediate node in the route of the wavelength connection. For the case where there are multiple intermediate nodes between the source node and the sink node, the processing of each intermediate node is similar to the processing of the intermediate node described in this embodiment. , which will not be repeated here.

The foregoing embodiment can be implemented by extending the GMPLS (Generalized Multiprotocol LabelSwitching, Generalized Multiprotocol Label Switching) RSVP-TE (Resource Reservation Protocol with TE, resource reservation protocol with traffic engineering) protocol, the Path message is used as a request message, and the Resv message is used as a response Messages, spectrum bandwidth information, center frequency information, and center frequency set information can be carried by adding or extending existing GMPLS RSVP-TE signaling.

When the spectrum bandwidth information is carried in the Path message, it can be carried by the newly added traffic parameter object or the extended label request object; when the spectrum bandwidth information is carried in the Resv message, it can be carried by the newly added traffic parameter object.

A traffic parameter object is newly added in the Path message and the Resv message, and the encapsulation format of the payload thereof is shown in FIG. 7a, and the spectrum bandwidth is represented by 32 bits. The meaning of each field is as follows:

S: bits 0-3, used to indicate the width of a single spectrum unit, and the spectrum interval Slot=6.25×S (GHz). For example, S=1 means Slot=6.25GHz; S=2 means Slot=12.5GHz;

m: bits 16 to 31, indicating the number of spectrum interval slots occupied by the spectrum bandwidth, that is, spectrum bandwidth = Slot×m;

Reserved: Bits 4 to 15 are reserved.

According to the above definition, when S=1 and m=8, it means that the spectrum bandwidth=Slot×m=6.25×S×m=50 GHz.

The payload encapsulation format of the extended label request object in the Path message is shown in Figure 7b. Add 32 bits to the tag request object to indicate the spectrum bandwidth, where the meanings of S and m are the same as those of the above-mentioned newly added traffic parameter object.

The meaning of the original fields in the tag request object:

LSP Encap.Type: bits 0 to 7, indicating the encoding type of the connection, such as LSP Encap.Type=8, indicating that the encoding type of the connection is a wavelength connection;

Switching Type: Bits 8 to 15 indicate the switching type of the connection.

When the encoding type is wavelength, that is, wavelength connection, assign a new value to Switching Type, such as Switching Type=151, to newly define a wavelength switching type with variable spectrum bandwidth.

For example, the spectral bandwidth of the wavelength connection is 50 GHz, which can be indicated by the following parameters in the label request object: LSP Encap.Type=8, Switching Type=151, S=1, m=8.

In addition to the two message formats shown in Figures 7a and 7b, the spectrum bandwidth value can also be directly carried in the newly added traffic parameter object or the extended label request object, which is used for carrying spectrum bandwidth information in Path messages or Resv messages.

For the situation where the spectral bandwidth information of a wavelength connection or the spectral bandwidth information of a segment connection needs to be carried, it is carried by the traffic parameter object or label request object in the Path message, or the traffic parameter object in the Resv message.

For the situation where it is necessary to carry the spectrum bandwidth information of multiple segment connections, it is as in steps 501 and 502 of the fourth embodiment above. The spectrum bandwidth information of one segment connection can be carried by the traffic parameter object or label request object in the Path message, or the traffic parameter object in the Resv message, and the spectrum bandwidth information of the other segment connections can be carried by the explicit route object: define an explicit route As a sub-object, one or more explicit routing sub-objects are inserted after the OEO wavelength conversion interface of the display routing object, and the encapsulation format of the payload of the explicit routing sub-object is the same as that of the payload of the traffic parameter object shown in Figure 7a.

When the center frequency information is carried by the Resv message, it can be carried by an extended label object. The encapsulation format of the tag in the tag object in the Resv message is shown in Figure 7c, and the parameter assignment of the extended tag. The meaning of each field is as follows:

Grid: bits 0-2, indicating the WDM type, for example, when Grid=1, indicating DWDM.

C.S.: Bits 3 to 6 indicate the spectrum interval, and assign a new value to C.S., for example, C.S.=5, indicating that the spectrum interval is 6.25 GHz.

n: bits 16-31, center frequency f _n =193.1+(n×CS×/1000) (THz).

According to the above definition, the center frequency is 193.05THz, which can be represented by the following parameters in the tag object in the Resv message: Grid=1, C.S.=5, n=-8; the center frequency is 193.1THz, which can be represented by the The following parameters of the label set object represent: Grid=1, C.S.=5, n=0.

When the central frequency set information (available central frequency set or idle central frequency set) is carried in the Path message, it can be carried by an extended tag set object. Each tag in the tag set object carries a center frequency information. The encapsulation format of each tag is shown in Figure 7c. The meanings of the fields in the tag are the same as those in the tag object above.

By adopting the technical solution provided by the embodiment of the present invention, the wavelength cross-connection with variable spectrum bandwidth on the node can be automatically established, and the realization is simple and the reliability is high.

One aspect of the present invention provides a method for establishing a wavelength cross-connect, including:

The first node determines the spectral bandwidth of the wavelength connection, and obtains a first available center frequency set of the first link according to the spectral bandwidth; the first link is the first node and the first node to the second node Links between adjacent nodes in the direction;

The first node obtains the first available center frequency set information corresponding to the first available center frequency set and the spectrum bandwidth information corresponding to the spectrum bandwidth, and sends a message to neighbors in the direction from the first node to the second node The node sends a request message carrying the first available center frequency set information and the spectrum bandwidth information;

The first node receives the response message, extracts the center frequency information carried in the response message, obtains the center frequency of the wavelength connection, and establishes a wavelength cross-connection based on the center frequency and the spectrum range determined by the spectrum bandwidth;

The center frequency is an available center frequency acquired by the second node in a second set of available center frequencies; the second set of available center frequencies is an intersection of sets of available center frequencies of all links through which the wavelength connection passes.

Another aspect of the present invention provides a method for establishing a wavelength cross-connect, including:

The second node receives the request message, extracts the second available center frequency set information and spectrum bandwidth information carried in the request message, and obtains the second available center frequency set and the spectrum bandwidth of the wavelength connection determined by the first node; the second node The two sets of available center frequencies are the intersection of the sets of available center frequencies of all links via which the wavelength connection passes;

The second node acquires an available center frequency from the second set of available center frequencies as the center frequency of the wavelength connection, and establishes a wavelength cross-connection based on the center frequency and a spectrum range determined by the spectrum bandwidth.

Another aspect of the invention provides a method for establishing a wavelength cross-connect, including:

The third node receives the request message, extracts the third available center frequency set information and spectrum bandwidth information carried in the request message, and obtains the third available center frequency set and the spectrum bandwidth of the wavelength connection determined by the first node; The three available central frequency sets are the intersection of the available central frequency sets of all links between the first node and the third node through which the wavelength connection passes;

The third node obtains a set of available center frequencies of the second link according to the spectrum bandwidth, and intersects the set of available center frequencies of the second link with the third set of available center frequencies to obtain a fourth available center frequency A frequency set, obtaining information about a fourth available center frequency set corresponding to the fourth available center frequency set; the second link is between the third node and an adjacent node in the direction from the first node to the second node the link;

The third node sends a request message carrying the fourth available center frequency set information and the spectrum bandwidth information to adjacent nodes in the direction from the first node to the second node;

The third node receives the response message, extracts the center frequency information carried in the response message, obtains the center frequency of the wavelength connection, and establishes a wavelength cross-connection based on the center frequency and the spectrum range determined by the spectrum bandwidth;

The center frequency is an available center frequency acquired by the second node in a second set of available center frequencies; the second set of available center frequencies is an intersection of sets of available center frequencies of all links through which the wavelength connection passes.

Another aspect of the present invention provides a method for establishing a wavelength cross-connect, including:

The first node determines the spectral bandwidth of the wavelength connection, obtains the first idle central frequency set information corresponding to the first idle central frequency set of the third link and the spectral bandwidth information corresponding to the spectral bandwidth, and sends the information to the first node to the second The adjacent node in the direction of the two nodes sends a request message carrying the first free central frequency set information and the spectrum bandwidth information; the third link is the first node and the first node to the second node Links between adjacent nodes in the direction;

The first node receives the response message, extracts the center frequency information carried in the response message, obtains the center frequency of the wavelength connection, and establishes a wavelength cross-connection based on the center frequency and the spectrum range determined by the spectrum bandwidth;

The center frequency is an available center frequency obtained by the second node in the second free center frequency set according to the spectral bandwidth; the second free center frequency set is the free center frequency of all links through which the wavelength connection passes The intersection of sets.

Another aspect of the present invention provides a method for establishing a wavelength cross-connect, including:

The second node receives the request message, extracts the second free center frequency set information and spectrum bandwidth information carried in the request message, and obtains the second free center frequency set and the spectrum bandwidth of the wavelength connection determined by the first node; the second node The two free center frequency sets are the intersection of the free center frequency sets of all links via which the wavelength connection passes;

The second node obtains an available center frequency from the second free center frequency set according to the spectrum bandwidth as the center frequency of the wavelength connection, and establishes a wavelength cross-connection based on the center frequency and the spectrum range determined by the spectrum bandwidth .

Another aspect of the present invention provides a method for establishing a wavelength cross-connect, including:

The third node receives the request message, extracts the third idle center frequency set information and spectrum bandwidth information carried in the request message, and obtains the third idle center frequency set and the spectrum bandwidth of the wavelength connection determined by the first node; the first node The three free center frequency sets are the intersection of the free center frequency sets of all links between the first node and the third node through which the wavelength connection passes;

The third node intersects the idle center frequency set of the fourth link with the third idle center frequency set to obtain a fourth idle center frequency set, and obtains a fourth idle center corresponding to the fourth idle center frequency set frequency set information; the fourth link is a link between the third node and an adjacent node in the direction from the first node to the second node;

The third node sends a request message carrying the fourth free center frequency set information and the spectrum bandwidth information to adjacent nodes in the direction from the first node to the second node;

The third node receives the response message, extracts the center frequency information carried in the response message, obtains the center frequency of the wavelength connection, and establishes a wavelength cross-connection based on the center frequency and the spectrum range determined by the spectrum bandwidth;

The center frequency is an available center frequency obtained by the second node from the second free center frequency set according to the spectral bandwidth; the second free center frequency set is the idle frequency of all links through which the wavelength connection passes. Intersection of sets of center frequencies.

One aspect of the present invention provides a node device, including:

The first processing module is configured to determine the spectral bandwidth of the wavelength connection, and obtain the first set of available center frequencies of the first link according to the spectral bandwidth; the first link is the connection between the current node and the current node to the second node. A link between adjacent nodes; it is also used to obtain the first available central frequency set information corresponding to the first available central frequency set and the spectral bandwidth information corresponding to the spectral bandwidth; it is also used to obtain the center of the wavelength connection frequency; the center frequency is an available center frequency obtained by the second node in the second set of available center frequencies; the second set of available center frequencies is the intersection of the set of available center frequencies of all links through which the wavelength connection passes ;

A first sending module, configured to send a request message carrying the first available center frequency set information and the spectrum bandwidth information to an adjacent node in the direction from the current node to the second node;

A first receiving module, configured to receive a response message, and extract center frequency information carried in the response message;

A first cross-connection establishment module, configured to establish a wavelength cross-connection in a spectrum range determined based on the center frequency and the spectrum bandwidth.

Another aspect of the present invention provides a node device, including:

The second receiving module is configured to receive a request message, and extract the second available central frequency set information and spectrum bandwidth information carried in the request message; the second available central frequency set is all links via which the wavelength connection passes the intersection of the sets of available center frequencies;

The second processing module is configured to obtain a second available center frequency set and the spectral bandwidth of the wavelength connection determined by the first node; and is also used to obtain an available center frequency in the second available center frequency set as the wavelength connection Center frequency;

The second cross-connection establishment module is configured to establish a wavelength cross-connection in a spectrum range determined based on the center frequency and the spectrum bandwidth.

Another aspect of the present invention provides a node device, including:

The third receiving module is configured to receive a request message, and extract the third available center frequency set information and spectrum bandwidth information carried in the request message; it is also used to receive a response message, and extract the center frequency information carried in the response message;

A third processing module, configured to obtain a third set of available central frequencies and the spectral bandwidth of the wavelength connection determined by the first node; the third set of available central frequencies is between the first node and the current node through which the wavelength connection passes The intersection of the set of available center frequencies of all links; it is also used to obtain the set of available center frequencies of the second link according to the spectrum bandwidth, and combine the set of available center frequencies of the second link with the set of available center frequencies of the third link The intersection of frequency sets is taken to obtain a fourth set of available center frequencies, and the information of the fourth set of available center frequencies corresponding to the fourth set of available center frequencies is obtained; the second link is between the node and the first node to the second link. A link between adjacent nodes in the node direction; it is also used to obtain the center frequency of the wavelength connection; the center frequency is an available center frequency obtained by the second node in the second set of available center frequencies; the second The set of available center frequencies is the intersection of the sets of available center frequencies of all links via which the wavelength connection passes;

A third sending module, configured to send a request message carrying the fourth available central frequency set information and the spectrum bandwidth information to adjacent nodes in the direction from the first node to the second node;

A third cross-connection establishment module, configured to establish a wavelength cross-connection in a spectrum range determined based on the center frequency and the spectrum bandwidth.

Another aspect of the present invention provides a node device, including:

The first processing module is configured to determine the spectral bandwidth of the wavelength connection, and obtain the first idle central frequency set information corresponding to the first idle central frequency set of the third link and the spectral bandwidth information corresponding to the spectral bandwidth; the third The link is the link between this node and the adjacent node in the direction from this node to the second node; it is also used to obtain the center frequency of the wavelength connection; the center frequency is the second node according to the spectrum bandwidth in the second An available center frequency obtained from a free center frequency set; the second free center frequency set is an intersection of free center frequency sets of all links via which the wavelength connection passes;

The first sending module is configured to send a request message carrying the first free central frequency set information and the spectrum bandwidth information to the adjacent node in the direction from the current node to the second node;

A first receiving module, configured to receive a response message, and extract center frequency information carried in the response message;

A first cross-connection establishment module, configured to establish a wavelength cross-connection in a spectrum range determined based on the center frequency and the spectrum bandwidth.

Another aspect of the present invention provides a node device, including:

The second receiving module is configured to receive a request message, and extract the second free center frequency set information and spectrum bandwidth information carried in the request message;

The second processing module is configured to obtain a second set of free center frequencies and the spectral bandwidth of the wavelength connection determined by the first node; the second set of free center frequencies is the set of free center frequencies of all links through which the wavelength connection passes Intersection; it is also used to obtain an available center frequency in the second idle center frequency set according to the spectrum bandwidth as the center frequency of the wavelength connection;

The second cross-connection establishment module is configured to establish a wavelength cross-connection in a spectrum range determined based on the center frequency and the spectrum bandwidth.

Another aspect of the present invention provides a node device, including:

The third receiving module is configured to receive a request message, and extract the third free center frequency set information and spectrum bandwidth information carried in the request message; it is also used to receive a response message, and extract the center frequency information carried in the response message;

The third processing module is configured to obtain a third idle central frequency set and the spectral bandwidth of the wavelength connection determined by the first node; the third idle central frequency set is between the first node and the current node through which the wavelength connection passes The intersection of the idle center frequency sets of all links; it is also used to take the intersection of the idle center frequency set of the fourth link and the third idle center frequency set to obtain the fourth idle center frequency set, and obtain the fourth Information about the fourth free central frequency set corresponding to the free central frequency set; the fourth link is a link between the node and the adjacent node in the direction from the first node to the second node; it is also used to obtain the wavelength The center frequency of the connection; the center frequency is an available center frequency obtained by the second node in the second free center frequency set according to the spectral bandwidth; the second free center frequency set is the wavelength connection via the intersection of the free center frequency sets of all links;

A third sending module, configured to send a request message carrying the fourth free center frequency set information and the spectrum bandwidth information to adjacent nodes in the direction from the first node to the second node;

A third cross-connection establishment module, configured to establish a wavelength cross-connection in a spectrum range determined based on the center frequency and the spectrum bandwidth.

One aspect of the present invention provides a system for establishing a wavelength cross-connection, the system includes at least a first node and a second node:

The first node is configured to determine the spectral bandwidth of the wavelength connection, and obtain a first set of available center frequencies of the first link according to the spectral bandwidth; the first link is the connection between the first node and the first node to The link between adjacent nodes in the direction of the second node; it is also used to obtain the first available center frequency set information corresponding to the first available center frequency set and the spectrum bandwidth information corresponding to the spectrum bandwidth, and send to the first The node sends a request message carrying the first available center frequency set information and the spectrum bandwidth information to the adjacent node in the direction of the second node; it is also used to receive a response message and extract the center frequency carried in the response message Information, obtaining the center frequency of the wavelength connection, and establishing a wavelength cross-connection based on the center frequency and the spectrum range determined by the spectrum bandwidth;

The second node is configured to receive the request message, extract the second available center frequency set information and spectrum bandwidth information carried in the request message, and obtain the second available center frequency set and the spectrum bandwidth of the wavelength connection determined by the first node; The second set of available center frequencies is the intersection of the sets of available center frequencies of all links passed by the wavelength connection; it is also used to obtain an available center frequency in the second set of available center frequencies as the center of the wavelength connection frequency, based on the center frequency and the spectrum range determined by the spectrum bandwidth to establish a wavelength cross-connection; it is also used to obtain the center frequency information corresponding to the center frequency, and to the corresponding direction from the second node to the first node The neighboring node sends a response message carrying the central frequency information.

Another aspect of the present invention provides a system for establishing a wavelength cross-connection, the system includes at least a first node and a second node:

The first node is configured to determine the spectral bandwidth of the wavelength connection, obtain the first idle central frequency set information corresponding to the first idle central frequency set of the third link and the spectral bandwidth information corresponding to the spectral bandwidth, and send the information to the first The adjacent node in the direction from the node to the second node sends a request message carrying the first free center frequency set information and the spectrum bandwidth information; the third link is the connection between the first node and the first node to A link between adjacent nodes in the direction of the second node; it is also used to receive a response message, extract the center frequency information carried in the response message, and obtain the center frequency of the wavelength connection, based on the center frequency and the spectrum Establish wavelength cross-connection in the spectrum range with determined bandwidth;

The second node is configured to receive the request message, extract the second idle center frequency set information and spectrum bandwidth information carried in the request message, and obtain the second idle center frequency set and the spectrum bandwidth of the wavelength connection determined by the first node ; The second free center frequency set is the intersection of the free center frequency sets of all links passed by the wavelength connection; it is also used to obtain an available center frequency in the second free center frequency set according to the spectral bandwidth As the center frequency of the wavelength connection, a wavelength cross-connection is established based on the center frequency and the spectrum range determined by the spectrum bandwidth; it is also used to obtain the center frequency information corresponding to the center frequency, and send the information from the second node to the second node. A node sends a response message carrying the central frequency information to an adjacent node.

Those of ordinary skill in the art can understand that all or part of the steps in the method of the above-mentioned embodiments can be completed by instructing related hardware through a computer program, and the program can be stored in a computer-readable storage medium, the program During execution, it may include the processes of the embodiments of the above-mentioned methods. Wherein, the storage medium may be a magnetic disk, an optical disk, a read-only memory (Read-Only Memory, ROM) or a random access memory (Random Access Memory, RAM) and the like.

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present invention. All should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims (18)

1. A method for setting up a wavelength cross-connect, characterized in that, comprising: The first node determines the spectral bandwidth of each segment connection on the wavelength connection, and obtains the fifth available center frequency set of the fifth link according to the spectral bandwidth of the segment connection where the first node is located; the fifth link is the first node. a link between a node and an adjacent node in the direction from the first node to the second node; Obtain the fifth available central frequency set information corresponding to the fifth available central frequency set and the spectral bandwidth information corresponding to the spectral bandwidth of each segment connection on the wavelength connection, and send the direction from the first node to the second node sending a request message carrying the information about the fifth set of available central frequencies and the information about the spectrum bandwidth; The first node receives the response message, extracts the first center frequency information carried in the response message, obtains the center frequency of the segment connection where the first node is located, and based on the center frequency of the segment connection where the first node is located and Establish wavelength cross-connection in the spectrum range determined by the spectrum bandwidth; The center frequency is an available center frequency obtained by the fourth node between the first node and the second node in the sixth available center frequency set; the sixth available center frequency set is the first node The intersection of the set of available center frequencies of all links through which the segment is connected; The obtaining the fifth available center frequency set of the fifth link according to the spectral bandwidth of the segment connection where the first node is located specifically includes: determining the frequency of the fifth link according to the spectral bandwidth of the segment connection where the first node is located The frequency range covered by each idle center frequency, if the center frequencies contained in the frequency range covered by an idle center frequency are all idle center frequencies, then determine that the idle center frequency is an available center frequency, and then obtain the fifth available center collection of frequencies. 2. A method for setting up a wavelength cross-connect, characterized in that, comprising: The fourth node receives the request message, extracts the sixth available central frequency set information and the first spectrum bandwidth information carried in the request message, obtains the sixth available central frequency set, and obtains the location of the fourth node determined by the first node. The first node side segment connection and the spectrum bandwidth of each segment connection between the fourth node and the second node; the sixth available center frequency set is the first node side segment connection where the fourth node is located the intersection of the sets of available center frequencies of all links traversed; The fourth node acquires an available center frequency from the sixth set of available center frequencies as the center frequency of the side section connection of the first node where the fourth node is located; The fourth node obtains the seventh available center frequency set of the sixth link according to the spectral bandwidth of the side section connection of the second node where the fourth node is located; the sixth link is the fourth node and Links between adjacent nodes in the direction from the first node to the second node; Obtain the seventh available central frequency set information corresponding to the seventh available central frequency set, obtain the second spectral bandwidth information corresponding to the spectral bandwidth of each segment connection between the fourth node and the second node, and send to the sending a request message carrying information about the seventh available central frequency set and information about the second spectrum bandwidth from the first node to the adjacent node in the direction of the second node; The fourth node receives the response message, extracts the second center frequency information carried in the response message, and obtains the center frequency of the side section connection of the second node where the fourth node is located, based on the fourth node determining the first spectrum range based on the center frequency and spectrum bandwidth of the side-section connection of the first node where the fourth node is located, and determining the second spectrum range based on the center frequency and spectrum bandwidth of the side-section connection of the second node where the fourth node is located, establishing a wavelength cross-connection between the first spectral range and the second spectral range; The center frequency of the side section connection of the second node where the fourth node is located is an available center frequency in the eighth available center frequency set; the eighth available center frequency set is the The intersection of the set of available center frequencies of all the links through which the side section of the second node is connected; The obtaining the seventh set of available central frequencies of the sixth link according to the spectrum bandwidth of the side-section connection of the second node where the fourth node is located specifically includes: Determine the frequency range covered by each idle center frequency of the sixth link according to the spectrum bandwidth of the side-section connection of the second node where the fourth node is located, if a center included in the frequency range covered by an idle center frequency If the frequencies are all idle center frequencies, it is determined that the idle center frequency is an available center frequency, and then the seventh set of available center frequencies is obtained. 3. A method for establishing a wavelength cross-connect, characterized in that, comprising: The third node receives the request message, extracts the tenth available central frequency set information and spectrum bandwidth information carried in the request message, obtains the tenth available central frequency set, and obtains the segment connection of the third node determined by the first node Spectrum bandwidth connected to each segment between the third node and the second node; the tenth available center frequency set is the first node or the fourth node connected to the segment where the third node is connected to the intersection of the sets of available center frequencies of all links between the third nodes; The third node obtains the set of available center frequencies of the seventh link according to the spectrum bandwidth of the segment connection where the third node is located; and the set of available center frequencies of the seventh link and the set of available center frequencies of the tenth link Intersection, obtaining the eleventh available center frequency set, obtaining the eleventh available center frequency set information corresponding to the eleventh available center frequency set; the seventh link is the third node and the first node Links between adjacent nodes in the direction to the second node; The third node sends a request message carrying the eleventh available central frequency set information and the spectrum bandwidth information to adjacent nodes in the direction from the first node to the second node; The third node receives the response message, extracts the third center frequency information carried in the response message, and obtains the center frequency of the segment connection where the third node is located, based on the center frequency of the segment connection where the third node is located and Establish wavelength cross-connection in the spectrum range determined by the spectrum bandwidth; The center frequency is an available center frequency acquired by the fourth node between the third node and the second node or the second node in the eleventh available center frequency set; the eleventh available center frequency The frequency set is the intersection of the available center frequency sets of all the links through which the segment connection of the third node is located; The third node obtains the set of available center frequencies of the seventh link according to the spectrum bandwidth of the segment connection where the third node is located, specifically including: The third node determines the frequency range covered by each idle center frequency of the seventh link according to the spectrum bandwidth of the segment connection where the third node is located, and if the center frequencies included in the frequency range covered by an idle center frequency are all is an idle center frequency, then determine that the idle center frequency is an available center frequency, and then obtain a set of available center frequencies of the seventh link. 4. A method for establishing a wavelength cross-connect, characterized in that, comprising: The first node determines the spectral bandwidth of each segment connection on the wavelength connection, obtains the fifth idle center frequency set information corresponding to the fifth idle center frequency set of the eighth link and corresponds to the spectrum bandwidth of each segment connection on the wavelength connection spectrum bandwidth information, and send a request message carrying the fifth free center frequency set information and the spectrum bandwidth information to the adjacent nodes in the direction from the first node to the second node; the eighth link is the Links between the first node and adjacent nodes in the direction from the first node to the second node; The first node receives the response message, extracts the fifth center frequency information carried in the response message, and obtains the center frequency of the segment connection where the first node is located, based on the center frequency of the segment connection where the first node is located and Establish wavelength cross-connection in the spectrum range determined by the spectrum bandwidth; The center frequency is an available center frequency obtained from the sixth free center frequency set by the fourth node between the first node and the second node according to the spectral bandwidth of the segment connection where the first node is located; The six free center frequency sets are the intersection of the free center frequency sets of all the links through which the first node is connected; The center frequency is an available center frequency obtained by the fourth node between the first node and the second node in the sixth free center frequency set according to the spectral bandwidth of the segment connection where the first node is located, specifically including: The center frequency is an available center frequency obtained by the fourth node from all available center frequencies in the sixth free center frequency set; the available center frequency is an idle center in the sixth idle center frequency set Frequency: the center frequencies included in the frequency range covered by the available center frequency determined according to the spectrum bandwidth of the segment connection where the first node is located are idle center frequencies. 5. A method for establishing a wavelength cross-connect, characterized in that, comprising: The second node receives the request message, extracts the ninth idle central frequency set information and spectrum bandwidth information carried in the request message, obtains the ninth idle central frequency set, and obtains the segment connection of the second node determined by the first node Spectrum bandwidth; the ninth free central frequency set is the intersection of free central frequency sets of all links through which the second node is connected; The second node obtains an available center frequency from the ninth free center frequency set according to the spectrum bandwidth of the segment connection where the second node is located, as the center frequency of the segment connection where the second node is located, based on the first Establish a wavelength cross-connection in the spectrum range determined by the central frequency and spectrum bandwidth of the segment where the two nodes are located; The second node acquires an available center frequency in the ninth idle center frequency set according to the spectrum bandwidth of the segment connection where the second node is located, specifically including: Determine the frequency range covered by each idle center frequency in the ninth idle center frequency set according to the spectral bandwidth of the segment connection where the second node is located, if the center frequencies contained in the frequency range covered by an idle center frequency are all idle centers frequency, then determine that the free center frequency is an available center frequency; obtain an available center frequency from all available center frequencies in the ninth set of free center frequencies. 6. A method for establishing a wavelength cross-connect, characterized in that, comprising: The fourth node receives the request message, extracts the sixth idle center frequency set information and the third spectrum bandwidth information carried in the request message, obtains the sixth idle center frequency set, and obtains the first node side where the fourth node is located The segment connection and the spectrum bandwidth of each segment connection between the fourth node and the second node; the sixth idle central frequency set is all links through which the segment connection on the side of the first node where the fourth node is located The intersection of the free center frequency sets of ; The fourth node obtains an available center frequency from the sixth free center frequency set according to the spectrum bandwidth of the side section connection of the first node where the fourth node is located, as the the center frequency of the side section connection of the first node; The fourth node obtains the seventh free center frequency set information corresponding to the seventh free center frequency set of the ninth link; obtains the information corresponding to the spectrum bandwidth of each segment connection between the fourth node and the second node. Four spectral bandwidth information, sending a request message carrying information about the seventh free center frequency set and the fourth spectral bandwidth information to adjacent nodes in the direction from the first node to the second node; the ninth link is the a link between the fourth node and the adjacent node in the direction from the first node to the second node; The fourth node receives the response message, extracts the sixth center frequency information carried in the response message, and obtains the center frequency of the side connection of the second node where the fourth node is located, based on the fourth node The center frequency and spectrum bandwidth of the side section connection of the first node where the location is located determine a third spectrum range, and the fourth spectrum range is determined based on the center frequency and spectrum bandwidth of the side section connection of the second node where the fourth node is located , establishing a wavelength cross-connection between the third spectrum range and the fourth spectrum range; The center frequency of the side section connection of the second node where the fourth node is located is an available center frequency in the eighth free center frequency set; the eighth free center frequency set is the center frequency of the second node where the fourth node is located The intersection of the free center frequency sets of all links through which the side section of the second node is connected; The acquiring an available center frequency in the sixth free center frequency set according to the spectrum bandwidth of the side-section connection of the first node where the fourth node is located specifically includes: Determine the frequency range covered by each idle center frequency in the sixth idle center frequency set according to the spectrum bandwidth of the side-section connection of the first node where the fourth node is located, if the frequency range covered by an idle center frequency includes If the center frequencies are all idle center frequencies, it is determined that the idle center frequency is an available center frequency; and an available center frequency is obtained from all available center frequencies in the sixth set of idle center frequencies. 7. A method for establishing a wavelength cross-connect, characterized in that, comprising: The third node receives the request message, extracts the tenth idle center frequency set information and spectrum bandwidth information carried in the request message, obtains the tenth idle center frequency set, and obtains the segment connection where the third node is determined by the first node Spectrum bandwidth connected to each segment between the third node and the second node; the tenth idle central frequency set is the first node or the fourth node connected to the segment connected by the third node to the an intersection of sets of free center frequencies of all links between the third nodes; The third node intersects the idle center frequency set of the tenth link with the tenth idle center frequency set to obtain an eleventh idle center frequency set, and obtains the tenth idle center frequency set corresponding to the eleventh idle center frequency set. A free central frequency set information; the tenth link is a link between the third node and the adjacent node in the direction from the first node to the second node; The third node sends to the adjacent nodes in the direction from the first node to the second node, carrying the eleventh free center frequency set information and the segment connection where the third node is located and the link between the third node and the second node. A request message for spectrum bandwidth information of each segment connection between nodes; The third node receives the response message, extracts the center frequency information carried in the response message, and obtains the center frequency of the segment connection where the third node is located, based on the center frequency and spectrum bandwidth of the segment connection where the third node is located Establish wavelength cross-connection in the determined spectrum range; The center frequency is obtained by the fourth node between the third node and the second node or by the second node in the eleventh free center frequency set according to the spectrum bandwidth of the connection in the segment where the third node is located An available center frequency; the eleventh idle center frequency set is the intersection of idle center frequency sets of all links through which the section where the third node is connected; The center frequency is obtained by the fourth node between the third node and the second node or by the second node in the eleventh free center frequency set according to the spectrum bandwidth of the connection in the segment where the third node is located An available center frequency, including: The center frequency is a fourth node between the third node and the second node or an available center frequency obtained by the second node from all available center frequencies in the eleventh free center frequency set The available center frequency is an idle center frequency in the eleventh set of idle center frequencies; the center frequencies included in the frequency range covered by the available center frequency determined according to the spectrum bandwidth are all idle center frequencies. 8. A node device, characterized in that it includes a first processing module, a first sending module, a first receiving module and a first cross-connection establishment module: The first processing module is configured to determine the spectral bandwidth of each segment connection on the wavelength connection, and obtain the fifth available center frequency set of the fifth link according to the spectral bandwidth of the segment connection where the node is located; the fifth link is the node The link between the adjacent nodes in the direction from the current node to the second node; it is also used to obtain the fifth available central frequency set information corresponding to the fifth available central frequency set and the spectrum of each segment connection on the wavelength connection Spectrum bandwidth information corresponding to the bandwidth; the obtaining of the fifth available center frequency set of the fifth link according to the spectrum bandwidth of the connection where the node is located specifically includes: determining the fifth link according to the spectrum bandwidth of the connection where the node is located The frequency range covered by each idle center frequency of the link, if the center frequencies contained in the frequency range covered by an idle center frequency are all idle center frequencies, then determine that the idle center frequency is an available center frequency, and then obtain the first Five sets of available center frequencies; The first sending module is configured to send a request message carrying the fifth available central frequency set information and the spectrum bandwidth information to the adjacent node in the direction from the current node to the second node; and is also used to obtain the segment where the current node is located The center frequency of the connection; the center frequency is an available center frequency obtained by the fourth node between the node and the second node in the sixth set of available center frequencies; the sixth set of available center frequencies is where the node is located the intersection of the set of available center frequencies of all links via which the segment is connected; A first receiving module, configured to receive a response message, and extract the first center frequency information carried in the response message; The first cross-connection establishment module is configured to establish a wavelength cross-connection based on a spectrum range determined by the center frequency of the section connection where the node is located and the spectrum bandwidth. 9. A node device, characterized in that it includes a fourth receiving module, a fourth processing module, a fourth sending module and a fourth cross-establishing module: The fourth receiving module is configured to receive a request message, and extract the sixth available center frequency set information and the first spectrum bandwidth information carried in the request message; it is also used to receive a response message, and extract the second spectrum bandwidth information carried in the response message. center frequency information; The fourth processing module is used to obtain the sixth set of available center frequencies, to obtain the side segment connection of the first node where the current node is located and the spectrum bandwidth of each segment connection between the current node and the second node determined by the first node; The set of six available center frequencies is the intersection of the sets of available center frequencies of all the links through which the side section of the first node where the node is located; it is also used to obtain an available center frequency in the sixth set of available center frequencies, As the center frequency of the side-section connection of the first node where the node is located; it is also used to obtain the seventh available center frequency set of the sixth link according to the spectrum bandwidth of the side-section connection of the second node where the node is located; The sixth link is a link between the node and the adjacent node in the direction from the first node to the second node; obtain the seventh available center frequency set information corresponding to the seventh available center frequency set, and obtain the node To the second spectrum bandwidth information corresponding to the spectrum bandwidth of each segment connection between the second nodes; it is also used to obtain the center frequency of the side segment connection of the second node where the node is located; the second node where the node is located The center frequency of the node side section connection is an available center frequency in the eighth available center frequency set; the eighth available center frequency set is the available center of all links through which the second node side section connection of the node is located The intersection of frequency sets; the obtaining of the seventh available center frequency set of the sixth link according to the spectrum bandwidth of the side section connection of the second node where the current node is located specifically includes: according to the said node where the current node is located The spectrum bandwidth of the second node side section connection determines the frequency range covered by each idle center frequency of the sixth link, if the center frequencies contained in the frequency range covered by an idle center frequency are all idle center frequencies, then determine the frequency range covered by each idle center frequency The idle center frequency is an available center frequency, and then the seventh set of available center frequencies is obtained; A fourth sending module, configured to send a request message carrying the seventh available central frequency set information and the second spectrum bandwidth information to adjacent nodes in the direction from the first node to the second node; The fourth cross establishment module is configured to determine the first spectrum range based on the center frequency and spectrum bandwidth of the side-section connection of the first node where the node is located, and determine the first spectrum range based on the center frequency and the spectrum bandwidth of the side-section connection of the second node where the node is located. The spectrum bandwidth determines a second spectrum range, and a wavelength cross-connection is established between the first spectrum range and the second spectrum range. 10. A node device, characterized in that it includes a third receiving module, a third processing module, a third sending module and a third cross setting module: The third receiving module is configured to receive a request message, and extract the tenth available center frequency set information and spectrum bandwidth information carried in the request message; it is also used to receive a response message, and extract the third center frequency carried in the response message information; The third processing module is used to obtain the tenth available central frequency set, and obtain the segment connection where the node is located and the spectrum bandwidth of each segment connection between the current node and the second node determined by the first node; the tenth available central frequency set It is the intersection of the available central frequency sets of all the links between the first node or the fourth node and the node through which the segment of the node is connected; it is also used to obtain the seventh link according to the spectrum bandwidth of the connection of the segment where the node is located The available center frequency set of the seventh link is intersected with the tenth available center frequency set to obtain the eleventh available center frequency set, and the corresponding eleventh available center frequency set is obtained. The eleventh available center frequency set information; the seventh link is the link between the node and the adjacent node in the direction from the first node to the second node; it is also used to obtain the center of the segment connection where the node is located frequency; the center frequency is an available center frequency obtained by the fourth node between the node and the second node or the second node in the eleventh available center frequency set; the eleventh available center frequency The set is the intersection of the available center frequency sets of all links connected to the section where the node is located; the obtaining of the available center frequency set of the seventh link according to the spectrum bandwidth of the section where the node is located specifically includes: according to the section where the node is located The spectrum bandwidth of the segment connection determines the frequency range covered by each idle center frequency of the seventh link, and if the center frequencies contained in the frequency range covered by an idle center frequency are all idle center frequencies, then determine the idle center frequency is an available center frequency, and then obtains a set of available center frequencies of the seventh link; A third sending module, configured to send a request message carrying the eleventh available central frequency set information and the spectrum bandwidth information to adjacent nodes in the direction from the first node to the second node; The third cross-connection establishment module is configured to establish a wavelength cross-connection based on a spectrum range determined by the center frequency of the section connection where the node is located and the spectrum bandwidth. 11. A node device, characterized in that it includes a first processing module, a first sending module, a first receiving module and a first cross-connection establishment module: The first processing module is configured to determine the spectral bandwidth of each segment connection on the wavelength connection, and obtain the fifth idle center frequency set information corresponding to the fifth idle center frequency set of the eighth link and each segment connection on the wavelength connection Spectrum bandwidth information corresponding to the spectrum bandwidth; the eighth link is the link between the node and the adjacent node in the direction from the node to the second node; it is also used to obtain the center frequency of the segment connection where the node is located; the The center frequency is an available center frequency obtained by the fourth node between the node and the second node in the sixth set of free center frequencies according to the spectral bandwidth of the section where the node is connected; the set of sixth idle center frequencies is the node The intersection of the free center frequency sets of all the links through which the segment is connected; the center frequency is the fourth node between the node and the second node in the sixth free center frequency set according to the spectral bandwidth of the segment where the node is connected Get one of the available center frequencies, including: The center frequency is an available center frequency obtained by the fourth node from all available center frequencies in the sixth free center frequency set; the available center frequency is an idle center in the sixth idle center frequency set Frequency; the center frequencies contained in the frequency range covered by the available center frequency determined according to the spectrum bandwidth of the segment connection where the node is located are idle center frequencies; The first sending module is configured to send a request message carrying the fifth free central frequency set information and the spectrum bandwidth information to the adjacent node in the direction from the current node to the second node; A first receiving module, configured to receive a response message, and extract the fifth center frequency information carried in the response message; The first cross-connection establishment module is configured to establish a wavelength cross-connection based on a spectrum range determined by the center frequency of the section connection where the node is located and the spectrum bandwidth. 12. A node device, characterized in that it comprises a second receiving module, a second processing module and a second cross-connection establishment module: The second receiving module is configured to receive a request message, and extract the ninth idle center frequency set information and spectrum bandwidth information carried in the request message; The second processing module is configured to obtain the ninth set of free central frequencies, and obtain the spectrum bandwidth of the section connection where the node is located as determined by the first node; the ninth set of free central frequencies is all the links through which the section connection where the node is located passes. The intersection of free center frequency sets; it is also used to obtain an available center frequency in the ninth free center frequency set according to the spectral bandwidth of the section connection where the node is located, as the center frequency of the section connection where the node is located; according to the node Obtaining an available center frequency in the ninth free center frequency set by the spectral bandwidth of the segment connection where the node is located specifically includes: determining each idle center in the ninth free center frequency set according to the spectral bandwidth of the segment connection where the node is located The frequency range covered by the frequency, if the center frequencies contained in the frequency range covered by an idle center frequency are all idle center frequencies, then it is determined that the idle center frequency is an available center frequency; all in the ninth set of idle center frequencies Obtain an available center frequency from the available center frequencies; The second cross-connection establishment module is configured to establish a wavelength cross-connection based on a spectrum range determined by the center frequency of the segment connection where the node is located and the spectrum bandwidth. 13. A node device, characterized in that it includes a fourth receiving module, a fourth processing module, a fourth sending module and a fourth cross setting module: The fourth receiving module is configured to receive a request message, and extract the sixth idle center frequency set information and the third spectrum bandwidth information carried in the request message; it is also used to receive a response message, and extract the sixth frequency information carried in the response message. center frequency information; The fourth processing module is configured to obtain a sixth free central frequency set, and obtain the spectral bandwidth of the side segment connection of the first node where the node is located and each segment connection between the current node and the second node; the sixth free central frequency set It is the intersection of the free center frequency sets of all links through which the side section connection of the first node where the node is located; it is also used in the sixth Obtain an available center frequency from the free center frequency set as the center frequency of the side section connection of the first node where the node is located; and also obtain the seventh free center frequency corresponding to the seventh free center frequency set of the ninth link Aggregate information to obtain fourth spectrum bandwidth information corresponding to the spectrum bandwidth of each segment connection between the node and the second node; the ninth link is the connection between the node and the direction from the first node to the second node A link between adjacent nodes; it is also used to obtain the center frequency of the side section connection of the second node where the node is located; the center frequency of the side section connection of the second node where the node is located is the eighth free center frequency set an available center frequency; the eighth free center frequency set is the intersection of the free center frequency sets of all the links through which the side section connection of the second node where the node is located; Obtaining an available center frequency from the sixth free center frequency set by the spectral bandwidth of the side-section connection of a node specifically includes: determining the sixth The frequency range covered by each idle center frequency in the set of idle center frequencies, if the center frequencies contained in the frequency range covered by an idle center frequency are all idle center frequencies, then it is determined that the idle center frequency is an available center frequency; Obtain an available center frequency from all available center frequencies in the sixth free center frequency set; A fourth sending module, configured to send a request message carrying information about the seventh free center frequency set and the fourth spectrum bandwidth information to adjacent nodes in the direction from the first node to the second node; The fourth cross establishment module is configured to determine the third spectrum range based on the center frequency and spectrum bandwidth of the side section connection of the first node where the node is located, and determine the third spectrum range based on the center frequency and the frequency spectrum bandwidth of the side section connection of the second node where the node is located. A fourth spectrum range determined by a spectrum bandwidth, and a wavelength cross-connection is established between the third spectrum range and the fourth spectrum range. 14. A node device, characterized in that it includes a third receiving module, a third processing module, a third sending module and a third cross setting module: The third receiving module is configured to receive a request message, and extract the tenth free center frequency set information and spectrum bandwidth information carried in the request message; it is also used to receive a response message, and extract the center frequency information carried in the response message; The third processing module is used to obtain the tenth idle central frequency set, and obtain the segment connection where the node is located and the spectrum bandwidth of each segment connection between the own node and the second node determined by the first node; the tenth idle central frequency set It is the intersection of the idle center frequency sets of all links between the first node or the fourth node and the node through which the node is located; it is also used to combine the idle center frequency set of the tenth link with the first node Take the intersection of the ten idle center frequency sets to obtain the eleventh idle center frequency set, and obtain the eleventh idle center frequency set information corresponding to the eleventh idle center frequency set; the tenth link is the connection between the node and the The link between the adjacent nodes in the direction from the first node to the second node; it is also used to obtain the center frequency of the section connection where the node is located; the center frequency is the fourth node between the node and the second node or the An available center frequency obtained by the second node from the eleventh free center frequency set according to the spectrum bandwidth of the node’s segment connection; the eleventh idle center frequency set is all the links passed by the node’s segment connection The intersection of free center frequency sets; the center frequency is obtained from the eleventh free center frequency set by the fourth node between the node and the second node or by the second node according to the spectrum bandwidth connected to the section where the node is located An available center frequency, specifically includes: the center frequency is the fourth node between the current node and the second node or all available centers of the second node in the eleventh free center frequency set An available center frequency obtained from the frequency; the available center frequency is an idle center frequency in the eleventh idle center frequency set; the center included in the frequency range covered by the available center frequency determined according to the spectrum bandwidth The frequencies are all free center frequencies; The third sending module is configured to send the eleventh free center frequency set information and the segment connection where the node is located and each link between the node and the second node to the adjacent node in the direction from the first node to the second node. A request message for spectrum bandwidth information of a segment connection; The third cross-connection establishment module is configured to establish a wavelength cross-connection based on a spectrum range determined by the center frequency of the section connection where the node is located and the spectrum bandwidth. 15. A system for establishing a wavelength cross-connect, characterized in that the system includes at least a first node, a second node and a fourth node: The first node is configured to determine the spectral bandwidth of each segment connection on the wavelength connection, and obtain the fifth available center frequency set of the fifth link according to the spectral bandwidth of the segment connection where the first node is located; the fifth link is The link between the first node and the adjacent nodes in the direction from the first node to the second node; it is also used to obtain the fifth available center frequency set information and the wavelength corresponding to the fifth available center frequency set Connect the spectrum bandwidth information corresponding to the spectrum bandwidth of each segment connection, and send a message carrying the fifth available center frequency set information and the spectrum bandwidth information to the adjacent node in the direction from the first node to the second node request message; it is also used to receive a response message, extract the first center frequency information carried in the response message, and obtain the center frequency of the segment connection where the first node is located, based on the center frequency of the segment connection where the first node is located and Establishing a wavelength cross-connection in the spectrum range determined by the spectrum bandwidth; said obtaining the fifth available center frequency set of the fifth link according to the spectrum bandwidth of the section connection where the first node is located, specifically includes: according to the section connection where the first node is located Determine the frequency range covered by each idle center frequency of the fifth link, if the center frequencies contained in the frequency range covered by an idle center frequency are all idle center frequencies, then determine that the idle center frequency is available center frequency, and then obtain the fifth set of available center frequencies; The fourth node is configured to receive the request message, extract the sixth available central frequency set information and the first spectrum bandwidth information carried in the request message, obtain the sixth available central frequency set, and obtain the fourth available central frequency set determined by the first node. The first node side segment connection where the node is located and the spectrum bandwidth of each segment connection between the fourth node and the second node; the sixth available center frequency set is the first node side where the fourth node is located The intersection of the available center frequency sets of all the links through which the segment connection passes; it is also used to obtain an available center frequency in the sixth available center frequency set as the segment connection on the side of the first node where the fourth node is located center frequency; also used to obtain the fourth center frequency information corresponding to the center frequency of the side section connection of the first node; also used to obtain according to the spectrum bandwidth of the side section connection of the second node where the fourth node is located The seventh available central frequency set of the sixth link; the sixth link is a link between the fourth node and the adjacent node in the direction from the first node to the second node; it is also used to obtain the The seventh available central frequency set information corresponding to the seventh available central frequency set obtains the second spectral bandwidth information corresponding to the spectral bandwidth of each segment connection between the fourth node and the second node, and sends the information to the first node The adjacent node in the direction of the second node sends a request message carrying the seventh available center frequency set information and the second spectrum bandwidth information; it is also used to receive a response message, and extract the first response message carried in the response message. Two center frequency information, obtaining the center frequency of the side connection of the second node where the fourth node is located, and determining the first based on the center frequency and spectrum bandwidth of the side connection of the first node where the fourth node is located a spectrum range, determining a second spectrum range based on the center frequency and spectrum bandwidth of the side-section connection of the second node where the fourth node is located, and establishing a wavelength cross-connection between the first spectrum range and the second spectrum range; The center frequency of the side section connection of the second node where the fourth node is located is an available center frequency in the eighth available center frequency set; the eighth available center frequency set is the The intersection of the set of available central frequencies of all the links through which the second node side section is connected; it is also used to send a response carrying the fourth central frequency information to the adjacent node in the direction from the second node to the first node information; The second node is configured to receive the request message, extract the ninth available central frequency set information and spectrum bandwidth information carried in the request message, and obtain the ninth available central frequency set and the segment where the second node is determined by the first node Spectrum bandwidth of the connection; the ninth set of available center frequencies is the intersection of the set of available center frequencies of all links through which the second node is connected; it is also used to obtain one of the ninth set of available center frequencies The center frequency can be used as the center frequency of the section connection where the second node is located, and a wavelength cross-connection is established based on the center frequency and the spectral bandwidth of the section connection where the second node is located; it is also used to obtain the The fifth center frequency information corresponding to the center frequency of the segment connection, and sending a response message carrying the fifth center frequency information to the adjacent node in the direction from the second node to the first node. 16. The system according to claim 15, wherein a third node is further included between the first node and the second node, specifically: The third node is configured to receive the request message, extract the tenth available central frequency set information and spectrum bandwidth information carried in the request message, obtain the tenth available central frequency set, and obtain the location of the third node determined by the first node The segment connection and the spectrum bandwidth of each segment connection between the third node and the second node; the tenth available center frequency set is the first node or the fourth node through which the segment connection of the third node passes The intersection of the available central frequency sets of all links between the node and the third node; it is also used to obtain the available central frequency set of the seventh link according to the spectral bandwidth of the segment connection where the third node is located; the first The set of available center frequencies of the seven links intersects with the set of tenth available center frequencies to obtain an eleventh set of available center frequencies, and obtain information about an eleventh set of available center frequencies corresponding to the set of eleventh available center frequencies; The seventh link is the link between the third node and the adjacent node in the direction from the first node to the second node; The adjacent node sends a request message carrying the eleventh available center frequency set information and the spectrum bandwidth information; it is also used to receive a response message, extract the third center frequency information carried in the response message, and obtain the third The center frequency of the section connection where the node is located is used to establish a wavelength cross-connection based on the center frequency of the section connection where the third node is located and the spectrum range determined by the spectrum bandwidth; it is also used to connect the second node to the first node The neighboring node sends a response message carrying the third center frequency information; The obtaining the set of available central frequencies of the seventh link according to the spectral bandwidth of the segment connection where the third node is located specifically includes: determining each of the seventh links according to the spectral bandwidth of the segment connection where the third node is located The frequency range covered by the idle center frequency, if the center frequencies contained in the frequency range covered by an idle center frequency are all idle center frequencies, then it is determined that the idle center frequency is an available center frequency, and then the availability of the seventh link is obtained A collection of center frequencies. 17. A system for establishing a wavelength cross-connect, characterized in that the system includes at least a first node, a second node and a fourth node: The first node is configured to determine the spectral bandwidth of each segment connection on the wavelength connection, and obtain the fifth idle center frequency set information corresponding to the fifth idle center frequency set of the eighth link and the information of each segment connection on the wavelength connection Spectrum bandwidth information corresponding to the spectrum bandwidth, sending a request message carrying the fifth idle central frequency set information and the spectrum bandwidth information to the adjacent node in the direction from the first node to the second node; the eighth link It is the link between the first node and the adjacent node in the direction from the first node to the second node; it is also used to receive a response message, extract the fifth center frequency information carried in the response message, and obtain the The center frequency of the segment connection where the first node is located, and the wavelength cross-connection is established based on the center frequency of the segment connection where the first node is located and the spectral range determined by the spectral bandwidth; The fourth node is configured to receive the request message, extract the sixth idle central frequency set information and the third spectrum bandwidth information carried in the request message, obtain the sixth idle central frequency set, and obtain the first idle central frequency set where the fourth node is located. The spectrum bandwidth of the node-side segment connection and each segment connection between the fourth node and the second node; the sixth idle central frequency set is all the first node-side segment connections where the fourth node is located. The intersection of the free center frequency sets of links; it is also used to obtain an available center frequency in the sixth free center frequency set according to the spectrum bandwidth of the side section connection of the first node where the fourth node is located, as the The center frequency of the side section connection of the first node where the fourth node is located; is also used to obtain the eighth center frequency information corresponding to the center frequency of the side section connection of the first node where the fourth node is located; Obtaining the seventh idle center frequency set information corresponding to the seventh idle center frequency set of the ninth link; obtaining the fourth spectrum bandwidth information corresponding to the spectrum bandwidth of each segment connection between the fourth node and the second node , sending a request message carrying the seventh free center frequency set information and the fourth spectrum bandwidth information to an adjacent node in the direction from the first node to the second node; the ninth link is between the fourth node and the The link between the adjacent nodes in the direction from the first node to the second node; it is also used to receive the response message, extract the sixth center frequency information carried in the response message, and obtain the location where the fourth node is located. The center frequency of the side section connection of the second node is determined based on the center frequency and spectrum bandwidth of the side section connection of the first node where the fourth node is located, and the third spectrum range is determined based on the side section connection of the fourth node. A fourth spectral range determined by the central frequency and spectral bandwidth of the side section connection of the two nodes, a wavelength cross-connection is established between the third spectral range and the fourth spectral range; the second node side where the fourth node is located The center frequency of the segment connection is an available center frequency in the eighth idle center frequency set; the eighth idle center frequency set is the idle frequency of all links through which the segment connection on the side of the second node where the fourth node is located The intersection of the center frequency sets; it is also used to send a response message carrying the eighth center frequency information to the adjacent node in the direction from the second node to the first node; The acquiring an available center frequency in the sixth free center frequency set according to the spectrum bandwidth of the side section connection of the first node where the fourth node is located specifically includes: according to the The spectral bandwidth of the side section connection of the first node determines the frequency range covered by each idle center frequency in the sixth idle center frequency set, if the center frequencies contained in the frequency range covered by an idle center frequency are all idle center frequencies, then determining that the free center frequency is an available center frequency; acquiring an available center frequency from all available center frequencies in the sixth set of free center frequencies; The second node is configured to receive the request message, extract the ninth idle center frequency set information and spectrum bandwidth information carried in the request message, obtain the ninth idle center frequency set, and obtain the location of the second node determined by the first node Spectrum bandwidth of the segment connection; the ninth free center frequency set is the intersection of the idle center frequency sets of all links through which the segment connection of the second node is located; Obtain an available center frequency in the ninth set of free center frequencies as the center frequency of the segment connection where the second node is located, and establish a spectrum range determined based on the center frequency and the spectrum bandwidth of the segment connection where the second node is located wavelength cross-connect; it is also used to obtain the ninth center frequency information corresponding to the center frequency of the section connection where the second node is located, and send the information carrying the ninth center frequency to the adjacent node in the direction from the second node to the first node Response message for center frequency information; The acquiring an available center frequency in the ninth free center frequency set according to the spectrum bandwidth of the segment connection where the second node is located specifically includes: Determine the frequency range covered by each idle center frequency in the ninth idle center frequency set according to the spectral bandwidth of the segment connection where the second node is located, if the center frequencies contained in the frequency range covered by an idle center frequency are all idle centers frequency, then determine that the free center frequency is an available center frequency; obtain an available center frequency from all available center frequencies in the ninth set of free center frequencies. 18. The system according to claim 17, further comprising a third node between the first node and the second node, specifically: The third node is configured to receive the request message, extract the tenth idle center frequency set information and spectrum bandwidth information carried in the request message, obtain the tenth idle center frequency set, and obtain the location of the third node determined by the first node The segment connection and the spectrum bandwidth of each segment connection between the third node and the second node; the tenth free center frequency set is the first node or the fourth node to which the segment connection of the third node passes through The intersection of the idle center frequency sets of all links between the third nodes; it is also used to intersect the idle center frequency set of the tenth link with the tenth idle center frequency set to obtain the eleventh idle center frequency set, and obtain the eleventh free center frequency set information corresponding to the eleventh free center frequency set; the tenth link is the third node and the adjacent node in the direction from the first node to the second node The link between; it is also used to send to the adjacent nodes in the direction from the first node to the second node, carrying the eleventh free center frequency set information and the segment connection where the third node is located and the third node A request message to the spectrum bandwidth information of each segment connection between the second nodes; it is also used to receive a response message, extract the center frequency information carried in the response message, and obtain the center frequency of the segment connection where the third node is located, based on Establishing a wavelength cross-connection within the spectrum range determined by the center frequency of the section connection where the third node is located and the spectrum bandwidth; and also used to obtain seventh center frequency information corresponding to the center frequency of the section connection where the third node is located, and send the information to the first The second node sends a response message carrying the seventh center frequency information to the adjacent node in the direction of the first node.