CN106303766B - Method and device for bandwidth adjustment - Google Patents

Abstract

The invention discloses a bandwidth adjustment method, which relates to the technical field of optical communication. The method is applied in an optical transmission network. The method includes: acquiring the bandwidth of the current service to be transmitted; if the bandwidth of the current service to be transmitted is the same as the If there is a bandwidth difference in the current bandwidth of the transmission unit, the number n of logical branch signals to be adjusted is determined according to the bandwidth difference; The number m of branch signals; adjust the current optical subcarrier, the current optical branch signal and the logical branch signal according to the determined number n of the logical branch signals to be adjusted and the number m of the optical branch signals to be adjusted quantity.

Description

Method and device for bandwidth adjustment

technical field

The invention relates to the technical field of optical communication, in particular to a bandwidth adjustment method and device.

Background technique

Optical transport network (English: Optical transport network, referred to as: OTN), as the core technology of the next generation transport network, is based on the wavelength division multiplexing technology and organizes the network transport network at the optical layer. The OTN includes the technical specifications of the electrical layer and the optical layer, uses optical fiber as the transmission medium, and can realize the transmission of large-capacity services, so it is widely used in the Metropolitan Area Network (English: Metropolitan Area Network, MAN for short). The OTN in the MAN, as shown in FIG. 1 , includes a plurality of network equipment (English: network equipment, NE for short) and switches, and signals are transmitted between different network equipments and between network equipment and switches through optical fibers.

Among them, the transmission process of the signal from the sending end device to the receiving end device specifically includes: the sending end device carries the service to be transmitted to the optical channel transmission unit (English: Optical Transport Unit-k order, OTUk for short) through encapsulation, and then transmits Photonic integrated circuit (English: Photonics Integration Circuit, referred to as PIC) performs photoelectric conversion to form multiple optical branch signals, and the multiple optical branch signals form an optical branch signal group, and then each of the optical branch signal groups included in the optical branch signal group The optical branch signal is carried by the optical sub-carrier and then transmitted to the receiving end device by the optical fiber. Opposite to the sending end, after receiving the optical tributary signal, the receiving end first performs photoelectric inverse conversion on the optical tributary signal by the PIC, and then bears it by the OTU and parses out the service to be transmitted. Wherein, the value of k in OTUk can be 1, 2, 3, 4, and the corresponding transmission bandwidths are 2.5Gbits/s, 10Gbits/s, 40Gbits/s and 100Gbits/s respectively. The bandwidth of the optical channel transmission unit to be selected is determined by the bandwidth of the Ethernet interface, and the total bandwidth of the selected photon carrier must match the bandwidth of the Ethernet interface. Figure 2-a shows that when the Ethernet interface is n channels of 40Gbit/s electrical signals, the corresponding optical channel transmission unit is n 40Gbit/s OTU3, and transmits optical signals through 4n 10Gbit/s optical subcarriers. Tributary signals; as shown in Figure 2-b, when the Ethernet interface bandwidth is n channels of 100Gbit/s, the corresponding optical channel transmission unit is n 100Gbit/s OTU4, and passes through 4n 25Gbit/s optical subcarriers Transmits optical tributary signals.

In the existing method of determining the optical channel transmission unit to be used according to the bandwidth of the Ethernet interface, once the bandwidth of the Ethernet interface is determined, the bandwidth of the optical channel transmission unit to be used is also determined accordingly. In this way, when the bandwidth of the data to be transmitted is smaller than the bandwidth of the Ethernet interface, it is easy to cause a waste of the bandwidth of the optical channel transmission unit and the photon subcarrier. When the actual bandwidth of the data to be transmitted is greater than the transmission bandwidth of the Ethernet interface, the existing Optical channel transmission units and optical subcarriers cannot carry data to be transmitted.

Contents of the invention

The present invention provides a method and device for bandwidth adjustment, in order to solve the problem in the prior art that the bandwidth of an optical channel transmission unit is determined by the bandwidth of an Ethernet interface, resulting in wasted bandwidth or inability to effectively carry data to be transmitted.

To achieve the above object, the present invention adopts the following technical solutions:

In a first aspect, the present invention provides a bandwidth adjustment method, the method is applied in an optical transport network, a transmission unit in the optical transport network includes at least one logical branch signal, and the number of the logical branch signals can be The bandwidth of each logical branch signal is equal to a preset value, the bandwidth of the transmission unit is equal to the sum of the bandwidths of all the logical branch signals, and the optical branch signal group in the optical transport network Including at least one optical branch signal, the number of the optical branch signals is adjustable, and the method includes:

Obtain the bandwidth of the current service to be transmitted;

If there is a bandwidth difference between the bandwidth of the current service to be transmitted and the current bandwidth of the transmission unit, then determine the number n of logical tributary signals to be adjusted according to the bandwidth difference;

Determine the number m of optical branch signals to be adjusted according to the preset quantity correspondence between logical branch signals and optical branch signals;

Adjust the number of the current optical subcarrier, the current optical branch signal, and the number of logical branch signals according to the determined number n of the logical branch signals to be adjusted and the number m of the optical branch signals to be adjusted.

With reference to the first aspect, in the first implementation manner of the first aspect, if there is a bandwidth difference between the bandwidth of the current service to be transmitted and the current bandwidth of the transmission unit, then determine the bandwidth to be adjusted according to the bandwidth difference The number n of logic branch signals, specifically including:

If the bandwidth of the current service to be transmitted is greater than the current bandwidth of the transmission unit, then determine the number n of logic tributary signals to be added according to the bandwidth difference;

Then, according to the preset quantity correspondence between logical branch signals and optical branch signals, determine the number m of optical branch signals to be adjusted, specifically including:

Determine the number m of optical branch signals to be added according to the preset quantity correspondence between logical branch signals and optical branch signals;

Then, according to the determined number n of logical branch signals to be adjusted and the number m of optical branch signals to be adjusted, the number of current optical subcarriers, current optical branch signals and logical branch signals is adjusted, specifically include:

activating m photocarriers and generating m optical branch signals corresponding to the m photocarriers;

adding the m optical tributary signals to the optical tributary signal group and modifying the overhead of the optical tributary signal group;

activating n logical tributary signals and adding the n logical tributary signals to the transmission unit.

With reference to the first aspect, in the second implementation manner of the first aspect, if there is a bandwidth difference between the bandwidth of the current service to be transmitted and the current bandwidth of the transmission unit, then determine the bandwidth to be adjusted according to the bandwidth difference The number of logic branch signals, including:

If the current service bandwidth to be transmitted is smaller than the current bandwidth of the transmission unit and the bandwidth difference is greater than the bandwidth of a single logical tributary signal, then determine the number n of logical tributary signals to be deleted according to the bandwidth difference;

Then, according to the preset quantity corresponding relationship between the logical branch signal and the optical branch signal, determine the quantity of the optical branch signal to be adjusted, specifically including:

Determine the number m of optical branch signals to be deleted according to the preset quantity correspondence between logical branch signals and optical branch signals;

Then, according to the determined number n of logical branch signals to be adjusted and the number m of optical branch signals to be adjusted, the number of current optical subcarriers, current optical branch signals and logical branch signals is adjusted, specifically including :

deleting the n logic tributary signals from the transmission unit;

Deleting the m optical branch signals corresponding to the n logical branch signals from the optical branch signal group and updating the overhead of the optical branch signal group;

Turn off the m optical sub-carriers corresponding to the m optical branch signals.

Combining the first aspect or any one of the first implementation manner and the second implementation manner of the first aspect, in the third implementation manner of the first aspect,

The frame structure of the transmission unit includes an overhead area and a payload area, the overhead area includes the overhead area of each logical tributary signal; the payload area includes the payload area of each logical tributary signal ;

The time slot division method of the payload area of the transmission unit specifically includes:

Determine the number of time slots included in the single logical tributary signal according to the bandwidth of the single logical tributary signal and the preset bandwidth of a single time slot;

determining the total number of time slots included in the transmission unit according to the number of logical tributary signals included in the transmission unit;

The time slots are divided according to the preset bytes, and the different logic branch signals are sequentially interleaved and multiplexed according to the preset bytes.

In combination with the first aspect, in the fourth implementation of the first aspect,

The current service to be transmitted is at least two mixed services including the optical channel data transmission unit service and the flexible optical channel data transmission unit service; or

The current service to be transmitted is a flexible optical channel data unit service carrying a 25Gbit/s Ethernet service.

With reference to the first aspect, in a fifth implementation manner of the first aspect, the transmission unit includes at least one of an optical channel payload unit, an optical channel data unit, and an optical channel transmission unit.

In the second aspect, the present invention also provides a bandwidth adjustment device, which is applied in an optical transport network, where a transmission unit in the optical transport network includes at least one logic branch signal, and the number of the logic branch signals is Adjustable, the bandwidth of each logical branch signal is equal and is a preset value, the bandwidth of the transmission unit is equal to the sum of the bandwidths of all the logical branch signals, and the optical branch signal in the optical transport network The group includes at least one optical branch signal, the number of the optical branch signals is adjustable, and the device includes:

An acquisition module, configured to acquire the bandwidth of the current service to be transmitted;

A processing module, configured to determine the number n of logical branch signals to be adjusted according to the bandwidth difference when there is a bandwidth difference between the bandwidth of the current service to be transmitted acquired by the acquisition module and the current bandwidth of the transmission unit;

Determine the number m of optical branch signals to be adjusted according to the preset quantity correspondence between logical branch signals and optical branch signals;

An adjustment module, configured to adjust the current optical subcarrier, the current optical branch signal and the logical branch signal according to the number n of the logical branch signals to be adjusted and the number m of the optical branch signals to be adjusted determined by the processing module. number of road signals.

With reference to the second aspect, in the first implementation manner of the second aspect, the processing module is specifically used for:

When the bandwidth of the current service to be transmitted is greater than the current bandwidth of the transmission unit, determine the number n of logic tributary signals to be added according to the bandwidth difference;

Determine the number m of optical branch signals to be added according to the preset quantity correspondence between logical branch signals and optical branch signals;

The adjustment module is specifically used for:

activating m photocarriers and generating m optical branch signals corresponding to the m photocarriers;

adding the m optical tributary signals to the optical tributary signal group and modifying the overhead of the optical tributary signal group;

activating n logical tributary signals and adding the n logical tributary signals to the transmission unit.

With reference to the second aspect, in the second implementation manner of the second aspect, the processing module is specifically further configured to:

When the current service bandwidth to be transmitted is smaller than the current bandwidth of the transmission unit and the bandwidth difference is greater than the bandwidth of a single logical tributary signal, determine the number n of logical tributary signals to be deleted according to the bandwidth difference;

Determine the number m of optical branch signals to be deleted according to the preset quantity correspondence between logical branch signals and optical branch signals;

The adjustment module is also specifically used for:

deleting the n logic tributary signals from the transmission unit;

Deleting the m optical branch signals corresponding to the n logical branch signals from the optical branch signal group and updating the overhead of the optical branch signal group;

Turn off the m optical sub-carriers corresponding to the m optical branch signals.

In combination with any one of the second aspect, the first implementation of the second aspect, and the second implementation, in the third implementation of the second aspect,

The frame structure of the transmission unit includes an overhead area and a payload area, and the overhead area is formed by sequentially interleaving and multiplexing the overhead area of each logical branch signal according to preset bytes; the payload area is formed by each The payload area of the logical branch signal is sequentially interleaved and multiplexed according to the preset bytes;

The device also includes a time slot division module for:

Determine the number of time slots included in the single logical tributary signal according to the bandwidth of the single logical tributary signal and the preset bandwidth of a single time slot;

determining the total number of time slots included in the transmission unit according to the number of logical tributary signals included in the transmission unit;

Time slot division is performed according to the preset bytes.

In combination with the second aspect, in the fourth implementation of the second aspect,

The current service to be transmitted acquired by the acquisition module is at least two mixed services including the optical channel data transmission unit service and the flexible optical channel data transmission unit service; or

The current service to be transmitted is a flexible optical channel data unit service carrying a 25Gbit/s Ethernet service.

The method and device for bandwidth adjustment provided by the present invention adjust the number of logical branch signals, optical branch signals and photon sub-carriers accordingly according to the bandwidth change of the current service, and then adjust the bandwidth of the optical transmission network to provide a suitable bandwidth to transmit the current service, Compared with the bandwidth in the optical transport network in the prior art, which is determined by the bandwidth of the Ethernet interface and cannot be adjusted, the bandwidth of the optical transport network in the present invention is adjustable, thus avoiding the gap between the service to be transmitted and the optical transport network. The problem of bandwidth waste or ineffective transmission caused by the current bandwidth mismatch can realize the effective transmission of data.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

FIG. 1 is a schematic structural diagram of an OTN network;

FIG. 2-a and FIG. 2-b are schematic structural diagrams of data transmission between a sending-end network device and a receiving-end network device in an OTN network in the prior art;

FIG. 3 is a schematic flowchart of a bandwidth adjustment method provided by an embodiment of the present invention;

FIG. 4 is a schematic flowchart of a method for adjusting bandwidth when the bandwidth increases according to an embodiment of the present invention;

FIG. 5 is a schematic flowchart of a specific implementation manner of bandwidth adjustment when bandwidth increases provided by an embodiment of the present invention;

FIG. 6 is a schematic flowchart of a method for bandwidth adjustment when the bandwidth is reduced according to an embodiment of the present invention;

FIG. 7 is a schematic flowchart of a specific implementation manner of bandwidth adjustment when the bandwidth is reduced according to an embodiment of the present invention;

FIG. 8 is a schematic flowchart of a method for dividing time slots in a payload area of a transmission unit according to an embodiment of the present invention;

FIG. 9 is a schematic diagram of a frame structure of an OTU including FEC provided by an embodiment of the present invention;

FIG. 10 is a schematic diagram of a frame structure of an OTU that does not include FEC provided by an embodiment of the present invention;

Figure 11-1 is a schematic diagram of the time slot division of the OPU payload area with 20 frames as a division period in the payload area of the single-channel OTULL provided by the embodiment of the present invention, with M=16 bytes as its time slot interleaving granularity;

Figure 11-2 is a schematic diagram of the OPU payload area of the frame structure of the OTU formed by interleaving and multiplexing the n-way OTULL provided by the embodiment of the present invention according to M=16 bytes;

FIG. 12 is a schematic flowchart of a method for carrying a mixed service using a frame structure of a transmission unit according to an embodiment of the present invention provided by an embodiment of the present invention;

FIG. 13 is a schematic flowchart of a method for carrying a dedicated service using the frame structure of the transmission unit in the embodiment of the present invention provided by the embodiment of the present invention;

FIG. 14 is a schematic structural diagram of a bandwidth adjustment device provided by an embodiment of the present invention;

FIG. 15 is a schematic structural diagram of another bandwidth adjustment device provided by an embodiment of the present invention;

FIG. 16 is a schematic structural diagram of another bandwidth adjustment device provided by an embodiment of the present invention.

Detailed ways

The following will clearly and completely describe the technical solution in this embodiment with reference to the drawings in this embodiment. Obviously, the described embodiment is only a part of the embodiments of the present invention, but 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.

An embodiment of the present invention provides a bandwidth adjustment method, and the method is applied in an optical transmission network. Wherein, the network architecture of the optical transport network is shown in FIG. 1 .

The transmission unit in the optical transport network in the embodiment of the present invention includes at least one logical branch signal, the number of the logical branch signals is adjustable, and the bandwidth of each logical branch signal is equal and is a preset value , the bandwidth of the transmission unit is equal to the sum of the bandwidths of all the logical tributary signals, the optical tributary signal group in the optical transport network includes at least one optical tributary signal, and the number of the optical tributary signals is adjustable .

Wherein, the logical branch, as a part of the transmission unit, is used to carry low-order/high-order ODU services or to carry ODUflex special services encapsulated with Ethernet services; then the transmission unit can be split into n logical branch signals; The optical branch is used to carry the corresponding logical branch signal and carry the corresponding optical layer monitoring and management overhead; after that, the optical signal is formed through photoelectric conversion and modulated to the corresponding optical sub-carrier, and transmitted through the optical fiber.

Wherein, the bandwidth of the single logical branch signal may be 40Gbit/s, 10Gbit/s, 12.5Gbit/s, 25Gbit/s, 50Gbit/s, 100Gbit/s and so on.

It should be noted that the bandwidth value provided in the embodiment of the present invention is an approximate bandwidth level value and does not represent a specific precise value.

The bandwidth of a single logic branch signal can be set according to the following aspects:

In the first aspect, since the bandwidth of the transmission unit is adjusted by adjusting the number of single logical branch signals in the embodiment of the present invention, the amount of bandwidth change for each adjustment is an integer multiple of the bandwidth of the single logical branch signal. The smaller the bandwidth of the single logic branch signal, the larger the range of adjustable bandwidth.

In the second aspect, since the bandwidth of the transmission unit in the optical transport network is consistent with the total bandwidth of the optical branch signal group composed of all optical branch signals, and the bandwidth of the transmission unit and the optical branch signal group are included in the The product of the bandwidth of a single-channel branch signal and the number of branch signals, so the bandwidth of a single-channel logical branch signal is generally set to an integer multiple of the bandwidth of a single-channel optical branch signal, so that the logic in the adjustment transmission unit For the number of branch signals, it is sufficient to adjust the optical branch signals that are a certain multiple of the number. Of course, this integer multiple can be 1. For example, the bandwidth of the optical branch signal is generally set to 10Gbit/s or 25Gbit/s, and the bandwidth of the corresponding logical branch signal is also set to 10Gbit/s or 25Gbit/s. In this way, the number of logical tributary signals and optical tributary signals that need to be adjusted is the same.

In the third aspect, considering the feasibility and low cost of the current 25Gbit/s technology, IEEE802.3 is stepping up efforts to formulate 25Gbit/s interface. With the popularization of 25Gbit/s services in the market, the subsequent 25Gbit/s and 50Gbit/s bandwidth may evolve into the main interface form of the metropolitan area network. Therefore, one way to realize the bandwidth of a single logical tributary signal is 25Gbit/s.

When actually setting the bandwidth of a single logic branch signal, the above aspects may be considered comprehensively, or only one or several of them or other aspects may be considered according to actual needs.

The number of logic tributary signals included in the transmission unit can be set at the maximum according to the estimated transmission service during initial setting.

In addition, the transmission unit referred to in the embodiment of the present invention includes an optical channel payload unit (English: Optical Channel Payload Unit, OPU for short), an optical channel data unit (English: Optical Channel Data Unit, short: ODU) and an optical channel transmission unit ( English: Optical Channel Transport Unit (OTU for short), at least one of these three transmission units are necessary transmission units in OTN. In general, OPU, ODU, and OTU have a certain hierarchical relationship. The business is mapped into the OPU payload area and the mapping overhead is added to form an OPU frame; the ODU overhead is added to the OPU frame (where the ODU overhead is used for end-to-end path monitoring) to form an ODU frame; the OTU overhead and preamble are added to the ODU frame To error correction (English: Forward Error Correction, referred to as: FEC) check information (wherein, OTU overhead is used for point-to-point link monitoring), form an OTU frame, and then send the service to be transmitted, so OPU, ODU and OTU The three are in one-to-one correspondence. Correspondingly, the logical branch corresponding to the OPU can be called the optical channel payload logical branch (English: Optical Channel Payload Unit Logic Lane, OPULL for short), and the logical branch corresponding to the ODU can be called the optical channel data logical branch (English: Optical Channel Data Unit Logic Lane, ODULL for short), the logical branch corresponding to the OTU may be called an optical channel transmission logical branch (English: Optical Channel Transport Unit Logic Lane, OTULL for short).

In addition, the embodiment of the present invention also provides a naming method for logical branches with different bandwidths of a single logical branch. When the bandwidth of a single logical branch is 10Gbit/s, the single logical branch can be respectively Named as OPUX, ODUX, OTUX, the corresponding transmission units composed of n 10Gbit/s single logical branches can be named OPUXn, ODUXn, OTUXn respectively; when the bandwidth of a single logical branch is 25Gbit/s, The single logical branch can be named as OPUXXV, ODUXXV, OTUXXV respectively, and the corresponding transmission unit composed of n 25Gbit/s single logical branches can be named OPUXXVn, ODUXXVn, OTUXXVn respectively; when the single logical branch When the bandwidth is 40Gbit/s, the single logical branch can be named OPUXL, ODUXL, OTUXL respectively, and the corresponding transmission unit composed of n 40Gbit/s single logical branches can be named OPUXLn, ODUXLn, OTUXLn respectively; When the bandwidth of a single logical branch is 50Gbit/s, the single logical branch can be named OPUL, ODUL, OTUL respectively, and the corresponding transmission unit composed of n 50Gbit/s single logical branches can be named respectively are OPULn, ODULn, and OTULn; when the bandwidth of a single logical branch is 100Gbit/s, the single logical branch can be named as OPUC, ODUC, and OTUC respectively, and correspondingly there are n single logical branches of 100Gbit/s The composed transmission units can be named OPUCn, ODUCn, and OTUCn respectively; among them, X, XXV, XL, L, and C are Roman letters, representing 10, 25, 40, 50, and 100, respectively.

On the basis of the above-mentioned transmission unit provided by the embodiment of the present invention, as shown in FIG. 3, the method includes:

101: Obtain the bandwidth of the current service to be transmitted.

102: If there is a bandwidth difference between the bandwidth of the current service to be transmitted and the current bandwidth of the transmission unit, determine the number n of logical tributary signals to be adjusted according to the bandwidth difference.

The bandwidth of the transmission unit adjusted through this step needs to be greater than or equal to the bandwidth of the current service to be transmitted to ensure effective bearing of the service to be transmitted.

For example: the transmission unit currently includes 10 logical branch signals of 25Gbit/s, that is, the current total bandwidth of the transmission unit is 250Gbit/s, if the bandwidth of the service to be transmitted is 100Gbit/s, the bandwidth reduction is 150Gbit/s s, the number of logical branch signals to be deleted is 6; if the bandwidth of the service to be transmitted is 120Gbit/s, the bandwidth reduction is 130Gbit/s, and the number of logical branch signals to be deleted is 5; if When the bandwidth of the service to be transmitted is 320Gbit/s, the bandwidth increase is 70Gbit/s, and the number of logical branch signals to be added is 3.

103: Determine the number m of optical branch signals to be adjusted according to the preset number correspondence between logical branch signals and optical branch signals.

Since the total bandwidth of the transmission unit needs to be consistent with the total bandwidth of the optical tributary signal group, after determining the bandwidth to be adjusted by the transmission unit, it is also necessary to determine the number of optical tributary signals to be adjusted.

According to the corresponding relationship between the bandwidth of a single logical branch signal and the bandwidth of a single optical branch signal, the quantitative correspondence between the two can be obtained, for example: the bandwidth of a single logical branch signal is 40Gbit/s, When the bandwidth of a single optical tributary signal is 10 Gbit/s, adjusting one logical tributary signal requires corresponding adjustment of four optical tributary signals.

Of course, in an implementation of this step, the bandwidth of the single logical tributary signal is equal to the bandwidth of the single optical tributary signal, and the quantitative relationship between the two is 1:1. This implementation is realized during adjustment. simpler.

104: Adjust the number of the current optical subcarrier, the current optical branch signal, and the number of logical branch signals according to the determined number n of logical branch signals to be adjusted and the number m of optical branch signals to be adjusted.

Wherein, each photon carrier is used to carry one optical branch signal, so the number of photon carriers to be adjusted is the same as the number of optical branch signals to be adjusted, both are m. The number of photon subcarriers can be adjusted by turning off or activating photon subcarriers, the number of optical tributary signals can be adjusted by generating or deleting optical tributary signals, and the number of logical tributary signals can be adjusted by generating or deleting the number of logical tributary signals.

The bandwidth adjustment method provided by the embodiment of the present invention adjusts the number of logical tributary signals, optical tributary signals, and optical subcarriers accordingly according to the bandwidth change of the current service, and then adjusts the bandwidth of the optical transport network to provide a suitable bandwidth for transmitting the current service. Compared with the bandwidth in the optical transport network in the prior art, which is determined by the bandwidth of the Ethernet interface and cannot be adjusted, the bandwidth of the optical transport network in the present invention is adjustable, thus avoiding the gap between the service to be transmitted and the optical transport network. The problem of bandwidth waste or ineffective transmission caused by the current bandwidth mismatch can realize the effective transmission of services.

As a specific implementation of the method shown in Figure 3, when the bandwidth of the current service to be transmitted is greater than the current bandwidth, as shown in Figure 4, if the bandwidth of the current service to be transmitted is different from the current bandwidth of the transmission unit If there is a bandwidth difference, then determine the number n of logic branch signals to be adjusted according to the bandwidth difference, specifically including:

201: If the bandwidth of the current service to be transmitted is greater than the current bandwidth of the transmission unit, determine the number n of logic tributary signals to be added according to the bandwidth difference.

Then, according to the preset quantity correspondence between logical branch signals and optical branch signals, determine the number m of optical branch signals to be adjusted, specifically including:

202: Determine the number m of optical tributary signals to be added according to the correspondence relationship between the preset numbers of logical tributary signals and optical tributary signals.

Then, according to the determined number n of logical branch signals to be adjusted and the number m of optical branch signals to be adjusted, the number of current optical subcarriers, current optical branch signals and logical branch signals is adjusted, specifically include:

203: Activate m optical subcarriers and generate m optical branch signals corresponding to the m optical subcarriers.

204: Add the m optical tributary signals to the optical tributary signal group and change overhead of the optical tributary signal group.

Among them, the overhead of the optical tributary signal group (English: Optical Tributary Signal Group Overhead, referred to as OTSiGO) is used to indicate the total number of OTSs included in the current OTSiG, as well as the center frequency, spectrum width, modulation pattern and other wavelengths of each OTSi information. Furthermore, the OTSiG-O may be delivered out-of-band, for example over a dedicated overhead wavelength.

205: Activate n logic branch signals and add the n logic branch signals to the transmission unit.

Due to the one-to-one correspondence between ODU, OPU and OTU, it is necessary to generate n channels, OPULL, ODULL and OTULL synchronously and add them to the current OPU, ODU or OTU.

As mentioned above, the bandwidth adjustment method provided by the embodiment of the present invention is mainly applied in the process of communicating between any two network devices in the OTN network. Adjustment. In order to explain the above steps 203 to 205 more clearly, taking network device 1 and network device 2 as two network devices that need bandwidth adjustment, this embodiment of the present invention also provides a method for adjusting optical subcarriers, optical branch signals and logical branch signals. The specific implementation process of the road signal, as shown in Figure 5, includes:

301: Activate m optical subcarriers and generate m optical branch signals corresponding to the m optical subcarriers, and add the generated m optical branch signals to an optical branch signal group.

302: Synchronously activate n channels of OPULL, ODULL and OTULL.

303: Losslessly add the activated n-way, OPULL, ODULL, and OTULL to the OPU, ODU, and OTU, respectively. In a specific implementation process, this step also includes the following steps 3031 to 3034.

3031: Network device 1 and network device 2 respectively initiate an add request for adding n logical branches.

Wherein, the add request carries the request type and the number of logical branches requested to be added, for example, when requesting to add n OPULLs, the request carries the mark [Req_Add, OPULLn].

3032: After receiving the corresponding increase request from the opposite end, send a response to the increase request to the opposite end.

For example: the acknowledgment carries the mark of [ACK, OPULLn].

3033: After receiving the response to the increase request from the opposite end, the local end will initiate an increase implementation indication, which is used to indicate that the end will carry services in the corresponding added n logical branches after sending the increase implementation indication.

For example: the implementation indication request carries the mark [do_Add, OPULLn].

3034: After receiving the corresponding additional implementation instruction from the opposite end, the local end extracts services from the corresponding added n logical branches; at the same time, sends a response to the additional implementation instruction to the opposite end.

For example: the acknowledgment carries the mark of [ACK, OPULLn].

After receiving the acknowledgment response of the additional implementation instruction from the opposite end, it means that the added n logical branches have been added into the transmission unit without loss, and at the same time, the lossless bearing of the service is realized.

It should be noted that after generating n channels of OPULL, ODULL and OTULL, the order of adding to the corresponding transmission unit is to first add n channels of OTULL to OTU, then add the corresponding n channels of ODULL to ODU, and finally add The corresponding n-way OPULL is added to the OPU.

As a specific implementation of the method shown in Figure 3, when the bandwidth of the current service to be transmitted is less than the current bandwidth, as shown in Figure 6, if the bandwidth of the current service to be transmitted is different from the current bandwidth of the transmission unit If there is a bandwidth difference, then determine the number of logical branch signals to be adjusted according to the bandwidth difference, specifically including:

401: If the current service bandwidth to be transmitted is smaller than the current bandwidth of the transmission unit and the bandwidth difference is greater than the bandwidth of a single logical tributary signal, determine the number n of logical tributary signals to be deleted according to the bandwidth difference .

Then, according to the preset quantity corresponding relationship between the logical branch signal and the optical branch signal, determine the quantity of the optical branch signal to be adjusted, specifically including:

402: Determine the number m of optical branch signals to be deleted according to the correspondence relationship between the preset numbers of logical branch signals and optical branch signals.

Then, according to the determined number n of logical branch signals to be adjusted and the number m of optical branch signals to be adjusted, the number of current optical subcarriers, current optical branch signals and logical branch signals is adjusted, specifically including :

403: Delete the n logical branch signals from the transmission unit.

404: Delete the m optical tributary signals corresponding to the n logic tributary signals from the optical tributary signal group and update the overhead of the optical tributary signal group.

405: Turn off the m optical sub-carriers corresponding to the m optical branch signals.

In order to explain the above step 403 to step 405 more clearly, the network device 1 and the network device 2 are still taken as the two network devices that need bandwidth adjustment. The specific implementation process of the logic branch signal, as shown in Figure 7, includes:

501: Delete the n logical branch signals from the transmission unit.

In the specific implementation process of step 501, this step includes the following steps 5011 to 5014.

5011: Network device 1 and network device 2 initiate deletion requests for deleting n logical branch signals respectively.

For example: when deleting n OPULLs, the deletion request carries the identifier of [Req_Remove, OPULLn] to indicate the type of the request and the number of OPULLs to be deleted.

5012: After receiving the delete request from the peer end, send a response to the delete request to the peer end.

For example: the response carries the identifier of [ACK, OPULLn].

5013: After receiving the response to the delete request from the opposite end, initiate a delete implementation instruction to indicate that the above n logical branch signals will no longer carry services after sending the deletion implementation instruction.

For example: the deletion implementation instruction carries the identifier of [do_Remove,OPULLn],

5014: After receiving the deletion implementation instruction from the opposite end, the local end no longer extracts services from the above-mentioned n logical branch signals; and at the same time, sends a reply response to the deletion implementation instruction to the opposite end.

For example: the acknowledgment may carry the indication of [ACK, OPULLn].

502: Delete the n logical branch signals after receiving the reply response of the delete implementation instruction from the opposite end.

503: Delete the m optical tributary signals corresponding to the n logic tributary signals from the optical tributary signal group and update the overhead of the optical tributary signal group.

504: Turn off the m optical sub-carriers corresponding to the m optical branch signals.

It should be noted that when it is determined to delete n logical branch signals, the deletion process is to first delete n OPULLs, then delete the corresponding n ODULLs, and finally delete the corresponding n OTULLs.

In addition, the reason why the bandwidth of the transmission unit in the present invention can be adjusted is related to the frame structure of the transmission unit. The frame structure of the transmission unit provided in the embodiment of the present invention can be adjusted according to the number of logical branch signals A frame structure for adjustments. The frame structure of the transmission unit includes an overhead area and a payload area, and the overhead area is formed by sequentially interleaving and multiplexing the overhead area of each logical branch signal according to preset bytes; the payload area is formed by each The payload area of the logical branch signal is sequentially interleaved and multiplexed according to the preset bytes. The time slot division method of the payload area of the transmission unit, as shown in Figure 8, specifically includes:

601: Determine the number of time slots included in the single logical tributary signal according to the bandwidth of the single logical tributary signal and the preset bandwidth of a single time slot.

Wherein, the preset bandwidth of the single time slot may be 1.25Gbit/s.

When the bandwidth of the single logic tributary signal is 25Gbit/s, and the preset bandwidth of a single time slot is 1.25Gbit/s, it can be obtained that the number of time slots included in the single logic gourd signal is 20.

602: Determine the total number of time slots included in the transmission unit according to the number of logical branch signals included in the transmission unit.

When a transmission unit includes n logical branch signals, the total number of time slots included in the transmission unit is 20n.

603: Perform time slot division according to preset bytes.

Wherein, the preset byte may be a single byte, that is, 1 byte, or M bytes, where M is a positive integer greater than 1. In an implementation manner of preset bytes, M is the transmission unit logic implementation circuit processing bus width, for example, 16 bytes, 64 bytes, 128 bytes, 256 bytes and so on.

In order to clearly introduce the frame structure of the transmission unit provided by the embodiment of the present invention, the OTU frame structure is used as an example for description below. When n logical branch signals are sequentially interleaved and multiplexed according to a single byte, the transmission unit is an OTU containing n OTULLs. In general, the frame structure of the OTU includes a frame structure of n OTULLs, and each OTULL includes Overhead area and payload area. The payload area of each OTULL can be divided into 20 time slots. Each OTULL can include or not include the FEC check area. All OTULL overhead areas constitute the OTU overhead area. , the payload areas of all OTULLs form the payload area of the OTU, and the FEC areas of all the OTULLs form the FEC area of the OTU.

The OTU frame structure is specifically:

When the OTU contains the FEC check area, the size of the OTU is 4 rows and 4080*n columns. As shown in Figure 9, the 1 to 7n columns in the first row and a total of 7n columns are frame header indication overhead, and the first row (7n+1)~14n columns in total 7n columns are the OTU overhead area, that is, the overhead area of n OTULLs, the overhead of each OTULL is 7 columns, and the 14n columns in the 2nd to 4th rows are ODUs The overhead area, that is, the overhead area of n-way ODULL, the (14n+1) to 16n columns of the 1st to 4th rows (14n+1) to 16n columns, a total of 2n columns are the OPU overhead area, that is, the overhead area of n-way OPULL, the ( A total of 3808n columns of 16n+1) to 3824n columns are the OPU payload area, and a total of 256n columns of (3824n+1) to 4080n columns in the first to fourth rows are the FEC check area of the OTU.

When the OTU does not contain the FEC check area, the size of the OTU is 4 rows and 3824*n columns, where, as shown in Figure 10, the 1 to 7n columns in the first row, a total of 7n columns, are frame header indication overhead, and the first A total of 7n columns (7n+1) to 14n columns of rows are the overhead area of n-way OTULL, and the overhead area of each OTULL is 7 columns, and a total of 14n columns of 1-14n columns in the 2nd to 4th rows are the overhead area of n-way OTULL area, 2n columns (14n+1) to 16n columns in the 1st to 4th rows are the overhead area of the n-way OPULL, and 3808n columns (16n+1) to 3824n columns in the 1st to 4th rows are the OPU payload area.

It should be noted that the OPU payload area includes two cases that contain padding columns and do not contain padding columns. The OTU frame structure shown in Figure 9 and Figure 10 is the case that includes padding columns, and the padding columns are the last of the OPU payload area. 8n columns.

In addition, the time slot division in the process of constructing the frame structure of the transmission unit is mainly to divide the OPU payload area into time slots according to preset bytes. Wherein, the preset byte can be a single byte, and the OTU includes n OTULLs, the bandwidth of each OTULL is 25Gbit/s, and the preset bandwidth of each time slot is 1.25Gbit/s, then in the payload area 16n+1～3824n columns, a total of 3808n columns are divided into 20n 1.25Gbit/s time slots according to the single-byte interval, and the time slot numbers are TS A.B; where A=1...n represents different numbers of logical branch signals , B=1...20; for example, 1.1, 2.1,..., n.1, 1.2, 2.2,..., until n.20.

However, when the frame structure shown in Fig. 9 and Fig. 10 is adopted, the related implementation of the logic circuit will face more buffer and selector requirements brought about by the mutual conversion between space division and time division. , these logic resource requirements will increase significantly non-linearly. Therefore, the embodiment of the present invention also provides a frame structure formed by interleaving and multiplexing n logical branch signals according to M bytes, where M is a positive integer greater than 1. As shown in Figure 11-1, the payload area of a single-channel OTULL uses M=16 bytes (the corresponding number of columns is 16 columns) as its time slot interleaving granularity, and 20 frames as a periodic OPU payload area Schematic diagram of time slot division, the payload area of single-channel OTULL is divided into 20 1.25Gbit/s time slots sequentially, and the time slot numbers are TS A.B (A=1...n represents the number of single-channel OTULL; B=1 ...20, the number of the time slot in this OTULL). Figure 11-2 is a schematic diagram of the OPU payload area of the OTU frame structure formed by interleaving multiplexing of n channels of OTULLs according to M=16 bytes, which includes 20n 1.25Gbit/s time slots.

It should be noted that the above Figures 11-1 and 11-2 only show the OPU payload area, and columns 15-16 show the time slot overhead (English: Tributary slot overhead, TSOH for short), payload structure An indication (English: payload structure identifier, PSI for short) and a multiframe indication.

It should be noted that the above frame structure is described by taking the OTU frame structure as an example. Since there is a layer-by-layer encapsulation relationship between the OPU, ODU, and OTU, the difference between the OPU frame structure and the OTU frame structure is that it does not require The overhead area of n-way OTULL and the overhead area of n-way ODULL, the frame structure of ODU is compared with the above-mentioned frame structure of OTU, and its difference is that the overhead area of n-way OTULL is not needed, so the frame structure of ODU and OPU can be according to the present invention The frame structure of the OTU provided in the embodiment is derived, and will not be described in detail in the embodiment of the present invention.

To sum up, compared with the existing transmission unit frame structure, the above-mentioned transmission unit frame structure composed of multi-byte interleaved multiplexing provided by the embodiment of the present invention has the following characteristics:

1) It consists of n logic branch signals interleaved and multiplexed by M bytes.

2) Each logical tributary signal corresponds to an overhead area and a payload area.

3) The time slot interleaving granularity included in the payload area of each logical tributary signal is M bytes, that is, the payload area is composed of multiple time slots interleaved and multiplexed with M bytes as the interleaving granularity.

The frame structure of the transmission unit provided by the embodiment of the present invention has a one-to-one correspondence with the n logical branch signals contained in it, and each logical branch signal corresponds to a part of the frame structure of the transmission unit, so it can be added or deleted The frame structure of a certain number of logical branch signals contained in the transmission unit further adjusts the frame structure of the transmission unit, thereby achieving the purpose of adjusting the bandwidth of the transmission unit.

In addition, the above-mentioned frame structure provided by the embodiment of the present invention can be used to carry mixed services and special services.

When carrying at least two mixed services including ODU service and flexible optical channel data transmission unit (ODUflex) service, the ODU service can be a low-order ODU service or a high-order ODU service, wherein the low-order ODU service To carry customer services other than ODU services, high-order ODU services are services that carry low-order ODU services. As shown in Figure 12, the process includes:

701: Map multiple services to an optical data tributary unit (English: Optical channel Data Tributary Unit, ODTU for short) composed of ts time slots.

Wherein, in an implementation manner of this step, a GMP mapping manner may be used.

702: Multiplex the optical data tributary unit consisting of ts time slots into the OPU and add OPU overhead, then multiplex the OPU into the ODU, then multiplex the ODU into the OTU, and add the OTU overhead.

In the specific implementation process of this step, since it is a point-to-point connection, the OTU can be regarded as a multiplex section interface, which can omit the ODU overhead and reduce processing complexity.

Of course, during the specific implementation of this step, the ODU overhead can also be added with reference to the prior art.

703: Map n channels of OTULLs to a corresponding number of optical tributary signals, add optical layer monitoring overhead, and transmit through PIC/PID optical subcarriers.

In addition, when the bandwidth of the single logical tributary signal in this embodiment is set to 25Gbit/s, the frame structure of the transmission unit provided by the embodiment of the present invention can also transmit the flexible optical channel data unit carrying 25Gbit/s Ethernet services This is a special service, but in the prior art, because the bandwidth of the transmission unit is 40Gbit/s or 100Gbit/s, which does not match the bandwidth of the special service, it is impossible to carry this kind of special service. The specific implementation process of this special service bearer is similar to the bearer of multiple mixed services, all of which have to go through the process of service mapping, multiplexing and adding management overhead. Optical channel data transmission unit (flexible optical channel data transmission unit). For example: when the dedicated service is n channels of 25Gbit/s Ethernet services, it is first necessary to bit-synchronously map the n channels of 25Gbit/s Ethernet services into n channels of ODUflex to form n channels of ODUflex (25G) services, and then adopt the steps Steps from step 701 to step 703 implement service bearer. Figure 13 is a schematic diagram of the implementation process of carrying n-channel ODUflex (25G) dedicated services.

As the implementation of the above methods, the embodiment of the present invention also provides a bandwidth adjustment device, the device is applied in the optical transport network, the transmission unit in the optical transport network includes at least one logic branch signal, the logic The number of branch signals is adjustable, the bandwidth of each logical branch signal is equal to a preset value, the bandwidth of the transmission unit is equal to the sum of the bandwidths of all the logical branch signals, and in the optical transport network The optical branch signal group includes at least one optical branch signal, the number of the optical branch signals is adjustable, as shown in Figure 14, the device includes:

An acquisition module 801, configured to acquire the bandwidth of the current service to be transmitted.

A processing module 802, configured to determine the number of logical tributary signals to be adjusted according to the bandwidth difference when there is a bandwidth difference between the bandwidth of the current service to be transmitted obtained by the obtaining module 801 and the current bandwidth of the transmission unit n;

The number m of the optical branch signals to be adjusted is determined according to the preset number corresponding relationship between the logical branch signals and the optical branch signals.

An adjustment module 803, configured to adjust the current optical subcarrier, current optical branch signal and Number of logical branch signals.

Further, the processing module 802 is specifically used for:

When the bandwidth of the current service to be transmitted is greater than the current bandwidth of the transmission unit, determine the number n of logic tributary signals to be added according to the bandwidth difference;

The number m of optical branch signals to be added is determined according to the preset quantity correspondence relationship between logical branch signals and optical branch signals.

The adjustment module 803 is specifically used for:

activating m photocarriers and generating m optical branch signals corresponding to the m photocarriers;

adding the m optical tributary signals to the optical tributary signal group and modifying the overhead of the optical tributary signal group;

activating n logical tributary signals and adding the n logical tributary signals to the transmission unit.

Further, the processing module 802 is also specifically configured to:

When the current service bandwidth to be transmitted is smaller than the current bandwidth of the transmission unit and the bandwidth difference is greater than the bandwidth of a single logical tributary signal, determine the number n of logical tributary signals to be deleted according to the bandwidth difference;

Determine the number m of optical branch signals to be deleted according to the preset quantity correspondence between logical branch signals and optical branch signals;

The adjustment module 803 is also specifically used for:

deleting the n logic tributary signals from the transmission unit;

Deleting the m optical branch signals corresponding to the n logical branch signals from the optical branch signal group and updating the overhead of the optical branch signal group;

Turn off the m optical sub-carriers corresponding to the m optical branch signals.

Further, the frame structure of the transmission unit includes an overhead area and a payload area, the overhead area includes an overhead area of each logical tributary signal; the payload area includes an overhead area of each logical tributary signal payload area;

As shown in Figure 15, the device also includes a time slot division module 901, configured to:

Determine the number of time slots included in the single logical tributary signal according to the bandwidth of the single logical tributary signal and the preset bandwidth of a single time slot;

determining the total number of time slots included in the transmission unit according to the number of logical tributary signals included in the transmission unit;

The time slots are divided according to the preset bytes, and the different logic branch signals are sequentially interleaved and multiplexed according to the preset bytes.

Further, the current service to be transmitted acquired by the obtaining module 801 is at least two mixed services including the optical channel data transmission unit service and the flexible optical channel data transmission unit service; or

The current service to be transmitted is a flexible optical channel data unit service carrying a 25Gbit/s Ethernet service.

The device for adjusting bandwidth provided by the embodiment of the present invention adjusts the number of logical tributary signals, optical tributary signals, and optical subcarriers accordingly according to the bandwidth change of the current service, and then adjusts the bandwidth of the optical transport network to provide a suitable bandwidth for transmitting the current service. Compared with the bandwidth in the optical transport network in the prior art, which is determined by the bandwidth of the Ethernet interface and cannot be adjusted, the bandwidth of the optical transport network in the present invention is adjustable, thus avoiding the gap between the service to be transmitted and the optical transport network. The problem of bandwidth waste or ineffective transmission caused by the current bandwidth mismatch can realize the effective transmission of data.

As the implementation of the above methods, the embodiment of the present invention also provides a bandwidth adjustment device, the device is applied in the optical transport network, the transmission unit in the optical transport network includes at least one logic branch signal, the logic The number of branch signals is adjustable, the bandwidth of each logical branch signal is equal to a preset value, the bandwidth of the transmission unit is equal to the sum of the bandwidths of all the logical branch signals, and in the optical transport network The optical branch signal group includes at least one optical branch signal, and the number of the optical branch signals is adjustable.

As shown in Figure 16, the device includes a processor 1001, a memory 1002 and a bus 1003, and the processor 1001 and the memory 1002 are connected through the bus 1003, wherein:

Processor 1001, configured to obtain the bandwidth of the current service to be transmitted;

When there is a bandwidth difference between the obtained bandwidth of the current service to be transmitted and the current bandwidth of the transmission unit, determine the number n of logical branch signals to be adjusted according to the bandwidth difference;

Determine the number m of optical branch signals to be adjusted according to the preset quantity correspondence between logical branch signals and optical branch signals;

Adjust the number of the current optical subcarrier, the current optical branch signal, and the number of logical branch signals according to the determined number n of the logical branch signals to be adjusted and the number m of the optical branch signals to be adjusted.

Further, the processor 1001 is specifically used for:

When the bandwidth of the current service to be transmitted is greater than the current bandwidth of the transmission unit, determine the number n of logic tributary signals to be added according to the bandwidth difference;

Determine the number m of optical branch signals to be added according to the preset quantity correspondence between logical branch signals and optical branch signals;

activating m photocarriers and generating m optical branch signals corresponding to the m photocarriers;

adding the m optical tributary signals to the optical tributary signal group and modifying the overhead of the optical tributary signal group;

activating n logical tributary signals and adding the n logical tributary signals to the transmission unit.

Further, the processor 1001 is specifically used for:

When the current service bandwidth to be transmitted is smaller than the current bandwidth of the transmission unit and the bandwidth difference is greater than the bandwidth of a single logical tributary signal, determine the number n of logical tributary signals to be deleted according to the bandwidth difference;

Determine the number m of optical branch signals to be deleted according to the preset quantity correspondence between logical branch signals and optical branch signals;

deleting the n logic tributary signals from the transmission unit;

Deleting the m optical branch signals corresponding to the n logical branch signals from the optical branch signal group and updating the overhead of the optical branch signal group;

Turn off the m optical sub-carriers corresponding to the m optical branch signals.

Further, the frame structure of the transmission unit includes an overhead area and a payload area, the overhead area includes an overhead area of each logical tributary signal; the payload area includes an overhead area of each logical tributary signal payload area;

The processor 1001 is further configured to:

Determine the number of time slots included in the single logical tributary signal according to the bandwidth of the single logical tributary signal and the preset bandwidth of a single time slot;

determining the total number of time slots included in the transmission unit according to the number of logical tributary signals included in the transmission unit;

The time slots are divided according to the preset bytes, and the different logic branch signals are sequentially interleaved and multiplexed according to the preset bytes.

Further, the current service to be transmitted acquired by the processor 1001 is at least two mixed services including the optical channel data transmission unit service and the flexible optical channel data transmission unit service; or

The current service to be transmitted is a flexible optical channel data unit service carrying a 25Gbit/s Ethernet service.

The device for adjusting bandwidth provided by the embodiment of the present invention adjusts the number of logical tributary signals, optical tributary signals, and optical subcarriers accordingly according to the bandwidth change of the current service, and then adjusts the bandwidth of the optical transport network to provide a suitable bandwidth for transmitting the current service. Compared with the bandwidth in the optical transport network in the prior art, which is determined by the bandwidth of the Ethernet interface and cannot be adjusted, the bandwidth of the optical transport network in the present invention is adjustable, thus avoiding the gap between the service to be transmitted and the optical transport network. The problem of bandwidth waste or ineffective transmission caused by the current bandwidth mismatch can realize the effective transmission of data.

It should be noted that the processor 1001 in this embodiment of the present invention may be one processor, or may be a general term for multiple processing elements. For example, the processor 1001 may be a central processing unit (Central Processing Unit, referred to as CPU), or a specific integrated circuit (Application Specific Integrated Circuit, referred to as ASIC), or be configured to implement one or more An integrated circuit, for example: one or more microprocessors (digital signal processor, DSP for short), or one or more field programmable gate arrays (Field Programmable Gate Array, FPGA for short).

The memory 1002 may be a storage device, or may be a general term for multiple storage elements, and is used to store executable program codes and the like. And the memory 1002 may include random access memory (RAM), and may also include non-volatile memory (non-volatile memory), such as disk memory, flash memory (Flash), and the like.

The bus 1003 may be an Industry Standard Architecture (Industry Standard Architecture, ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (Extended Industry Standard Architecture, EISA) bus, etc. The bus 1003 can be divided into address bus, data bus, control bus and so on. For ease of representation, only one thick line is used in FIG. 16 , but it does not mean that there is only one bus or one type of bus.

Through the description of the above embodiments, those skilled in the art can clearly understand that the present invention can be realized by means of software plus necessary general-purpose hardware, and of course also by hardware, but in many cases the former is a better embodiment . Based on this understanding, the essence of the technical solution of the present invention or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product is stored in a readable storage medium, such as a floppy disk of a computer , a hard disk or an optical disk, etc., including several instructions for enabling a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in various embodiments of the present invention.

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. Should be covered within the protection scope of the present invention.

Claims (9)

1. A bandwidth adjustment method, wherein the method is applied in an optical transport network, a transmission unit in the optical transport network includes at least one logical branch signal, and the number of the logical branch signals is adjustable, The bandwidth of each logical branch signal is equal and is a preset value, the bandwidth of the transmission unit is equal to the sum of the bandwidths of all the logical branch signals, and the optical branch signal group in the optical transport network includes at least One optical branch signal, the number of the optical branch signal is adjustable, and the method includes: Obtain the bandwidth of the current service to be transmitted; If there is a bandwidth difference between the bandwidth of the current service to be transmitted and the current bandwidth of the transmission unit, then determine the number n of logical tributary signals to be adjusted according to the bandwidth difference; Determine the number m of optical branch signals to be adjusted according to the preset quantity correspondence between logical branch signals and optical branch signals; Adjust the number of current optical subcarriers, current optical branch signals, and logical branch signals according to the determined number n of logical branch signals to be adjusted and the number m of optical branch signals to be adjusted; The frame structure of the transmission unit includes an overhead area and a payload area, and the overhead area is formed by sequentially interleaving and multiplexing the overhead area of each logical branch signal according to preset bytes; the payload area is formed by each The payload area of the logical branch signal is sequentially interleaved and multiplexed according to the preset bytes; The time slot division method of the payload area of the transmission unit specifically includes: Determine the number of time slots included in the single logical tributary signal according to the bandwidth of the single logical tributary signal and the preset bandwidth of a single time slot; determining the total number of time slots included in the transmission unit according to the number of logical tributary signals included in the transmission unit; Time slot division is performed according to the preset bytes. 2. The bandwidth adjustment method according to claim 1, wherein if there is a bandwidth difference between the bandwidth of the current service to be transmitted and the current bandwidth of the transmission unit, then determine the bandwidth to be adjusted according to the bandwidth difference The number n of logic branch signals, specifically including: If the bandwidth of the current service to be transmitted is greater than the current bandwidth of the transmission unit, then determine the number n of logic tributary signals to be added according to the bandwidth difference; Then, according to the preset quantity correspondence between logical branch signals and optical branch signals, determine the number m of optical branch signals to be adjusted, specifically including: Determine the number m of optical branch signals to be added according to the preset quantity correspondence between logical branch signals and optical branch signals; Then, according to the determined number n of logical branch signals to be adjusted and the number m of optical branch signals to be adjusted, the number of current optical subcarriers, current optical branch signals and logical branch signals is adjusted, specifically include: activating m photocarriers and generating m optical branch signals corresponding to the m photocarriers; adding the m optical tributary signals to the optical tributary signal group and modifying the overhead of the optical tributary signal group; activating n logical tributary signals and adding the n logical tributary signals to the transmission unit. 3. The bandwidth adjustment method according to claim 1, wherein if there is a bandwidth difference between the bandwidth of the current service to be transmitted and the current bandwidth of the transmission unit, then determine the bandwidth to be adjusted according to the bandwidth difference. The number of logic branch signals, including: If the current service bandwidth to be transmitted is smaller than the current bandwidth of the transmission unit and the bandwidth difference is greater than the bandwidth of a single logical tributary signal, then determine the number n of logical tributary signals to be deleted according to the bandwidth difference; Then, according to the preset quantity corresponding relationship between the logical branch signal and the optical branch signal, determine the quantity of the optical branch signal to be adjusted, specifically including: Determine the number m of optical branch signals to be deleted according to the preset quantity correspondence between logical branch signals and optical branch signals; Then, according to the determined number n of logical branch signals to be adjusted and the number m of optical branch signals to be adjusted, the number of current optical subcarriers, current optical branch signals and logical branch signals is adjusted, specifically including : deleting the n logic tributary signals from the transmission unit; Deleting the m optical branch signals corresponding to the n logical branch signals from the optical branch signal group and updating the overhead of the optical branch signal group; Turn off the m optical sub-carriers corresponding to the m optical branch signals. 4. The bandwidth adjustment method according to claim 1, wherein: The current service to be transmitted is at least two mixed services including optical channel data transmission unit services and flexible optical channel data transmission unit services; or The current service to be transmitted is a flexible optical channel data unit service carrying a 25Gbit/s Ethernet service. 5. The bandwidth adjustment method according to claim 1, wherein the transmission unit comprises at least one of an optical channel payload unit, an optical channel data unit, and an optical channel transmission unit. 6. A bandwidth adjustment device, characterized in that the device is applied in an optical transport network, and a transmission unit in the optical transport network includes at least one logical branch signal, and the number of the logical branch signals is adjustable, The bandwidth of each logical branch signal is equal and is a preset value, the bandwidth of the transmission unit is equal to the sum of the bandwidths of all the logical branch signals, and the optical branch signal group in the optical transport network includes at least One optical branch signal, the number of the optical branch signals is adjustable, and the device includes: An acquisition module, configured to acquire the bandwidth of the current service to be transmitted; A processing module, configured to determine the number n of logical branch signals to be adjusted according to the bandwidth difference when there is a bandwidth difference between the bandwidth of the current service to be transmitted acquired by the acquisition module and the current bandwidth of the transmission unit; Determine the number m of optical branch signals to be adjusted according to the preset quantity correspondence between logical branch signals and optical branch signals; An adjustment module, configured to adjust the current optical subcarrier, the current optical branch signal and the logical branch signal according to the number n of the logical branch signals to be adjusted and the number m of the optical branch signals to be adjusted determined by the processing module. the number of road signals; The frame structure of the transmission unit includes an overhead area and a payload area, and the overhead area is formed by sequentially interleaving and multiplexing the overhead area of each logical branch signal according to preset bytes; the payload area is formed by each The payload area of the logical branch signal is sequentially interleaved and multiplexed according to the preset bytes; The device also includes a time slot division module for: Determine the number of time slots included in the single logical tributary signal according to the bandwidth of the single logical tributary signal and the preset bandwidth of a single time slot; determining the total number of time slots included in the transmission unit according to the number of logical tributary signals included in the transmission unit; Time slot division is performed according to the preset bytes. 7. The bandwidth adjustment device according to claim 6, wherein the processing module is specifically used for: When the bandwidth of the current service to be transmitted is greater than the current bandwidth of the transmission unit, determine the number n of logic tributary signals to be added according to the bandwidth difference; Determine the number m of optical branch signals to be added according to the preset quantity correspondence between logical branch signals and optical branch signals; The adjustment module is specifically used for: activating m photocarriers and generating m optical branch signals corresponding to the m photocarriers; adding the m optical tributary signals to the optical tributary signal group and modifying the overhead of the optical tributary signal group; activating n logical tributary signals and adding the n logical tributary signals to the transmission unit. 8. The bandwidth adjustment device according to claim 6, wherein the processing module is further configured to: When the current service bandwidth to be transmitted is smaller than the current bandwidth of the transmission unit and the bandwidth difference is greater than the bandwidth of a single logical tributary signal, determine the number n of logical tributary signals to be deleted according to the bandwidth difference; Determine the number m of optical branch signals to be deleted according to the preset quantity correspondence between logical branch signals and optical branch signals; The adjustment module is also specifically used for: deleting the n logic tributary signals from the transmission unit; Deleting the m optical branch signals corresponding to the n logical branch signals from the optical branch signal group and updating the overhead of the optical branch signal group; Turn off the m optical sub-carriers corresponding to the m optical branch signals. 9. The bandwidth adjustment device according to claim 6, characterized in that, The current service to be transmitted acquired by the acquisition module is at least two mixed services including the optical channel data transmission unit service and the flexible optical channel data transmission unit service; or The current service to be transmitted is a flexible optical channel data unit service carrying a 25Gbit/s Ethernet service.