CN1897590B - A message transmission method and device based on DUA protocol - Google Patents

Abstract

The present invention provides a message transmission method and device based on the DUA protocol. The core of the method is: setting protocol identification information corresponding to different signaling system protocols, and the sending end transmits the message to be transmitted and the protocol identification information corresponding to the message To the receiving end, the receiving end determines the signaling system protocol corresponding to the message it receives according to the protocol identification information it receives. The present invention enables messages of different signaling protocols to be transmitted through the same interface in the network device, avoiding the phenomenon that messages of different protocols must be transmitted through different interfaces; thereby saving network device interface resources and reducing system networking costs the goal of.

Description

A message transmission method and device based on DUA protocol

technical field

The invention relates to the technical field of network communication, in particular to a message transmission method and device based on the DUA protocol.

Background technique

NGN is the abbreviation of the next generation network system, and NGN is gradually replacing the current traditional PSTN (Public Switched Telephone Network). Compared with the traditional PSTN network, the biggest difference between NGN and traditional PSTN is the separation of control system/bearer network and IP-based voice.

In the next generation network, the concepts of "media gateway controller" and "media gateway" are proposed. When the original PSTN signaling is moved to NGN, the interlayer protocol will be separated and run in different network components. To achieve this For this purpose, SIGTRAN (Signaling Transport) signaling was introduced.

SIGTRAN signaling is formulated by a special SIGTRAN working group established by IETF. SIGTRAN signaling is composed of a group of protocol families with similar basic functions, and its purpose is to ensure the reliable transmission of traditional circuit switching signaling on the IP network. DUA (DPNSS/DASS User Adaptation Layer Protocol) is one of the SIGTRAN protocol suite.

DPNSS 1 (Digital Private Network Signaling System) and DASS 2 (Digital Access Signaling System) are currently widely used private network signaling systems on BT (British Telecom) networks. In order to migrate the interlayer signaling of DPNSS1/DASS 2 to NGN, its layer 2/3 protocols need to run separately on the "media gateway" and "media gateway controller" equipment, such as the DPNSS L3 or DASS 2 L3 protocol needs Running on the "Media Gateway Controller" device, DPNSS L2 or DASS 2 L2 protocol needs to run on the "Media Gateway" device. At this time, the DUA protocol needs to be introduced to realize the intercommunication of the DPNSS L3/L2 layer protocol.

The operation of the DPNSS 1 protocol on NGN is shown in Figure 1.

] In Fig. 1, PBX is the small exchange device in the private network, and its signaling accesses the NGN network through the SG (Signaling Gateway) device, and accepts the control of the MGC (Media Gateway Controller) device. The physical medium for communication between the PBX and the SG is the E1 or T1 interface. The operation of the DASS 2 protocol on NGN is similar to that of the above-mentioned DPNSS1 protocol on NGN.

In practical applications, the same set of equipment may need to run DPNSS 1 and DASS 2 protocols at the same time, and must be carried by the same DUA protocol. For example, in Figure 1 above, DPNSS 1 and DASS 2 protocols need to be carried on the SG at the same time On the same DUA protocol between the device and the MGC device.

At present, the method of running DPNSS 1 and DASS 2 protocols on the same set of equipment at the same time is: run DPNSS 1 and DASS 2 respectively through different E1/T1 interfaces, that is, one E1/T1 interface can only transmit messages of one protocol, so , if the DPNSS 1 and DASS 2 protocols need to be run simultaneously on the same set of equipment, two E1/T1 interfaces need to be occupied, which wastes precious E1/T1 resources and increases the networking cost of the system.

Contents of the invention

The object of the present invention is to provide a message transmission method and device based on the DUA protocol, by transmitting the protocol identification information corresponding to the message, so as to realize the purpose of saving network equipment interface resources and reducing the cost of system networking.

In order to achieve the above object, a kind of message transmission method based on DUA protocol provided by the present invention includes:

a. Set protocol identification information corresponding to different signaling system protocols; the protocol identification information is interface identification information,

Described step a specifically comprises:

Set the interface, the corresponding relationship between the interface identification information and the signaling system protocol; and one interface corresponds to at least two interface identification information, and one interface identification corresponds to one signaling system protocol.

b. The sending end transmits the message to be transmitted and the protocol identification information corresponding to the message to the receiving end;

c. The receiving end determines the signaling system protocol corresponding to the received message according to the received protocol identification information.

Described step b specifically comprises:

The sender determines the interface for transmitting the message and the signaling system protocol corresponding to the message;

The sending end determines the interface and the interface identification information corresponding to the signaling system protocol, carries the interface identification information in the interface identification field of the message, and transmits it to the receiving end.

Described step c specifically comprises:

The receiving end obtains the interface identification information in the message it receives;

The receiving end determines the signaling system protocol corresponding to the acquired interface identification information according to the interface, the corresponding relationship between the interface identification information and the signaling system protocol.

The signaling system protocol in the step a includes: digital private network signaling system protocol, digital access signaling system protocol;

In addition, the sending end and the receiving end are: a digital private network signaling system protocol entity, or a digital access signaling system protocol entity.

The digital private network signaling system protocol entity is: a digital private network signaling system layer 2 protocol entity, or a digital private network signaling system layer 3 protocol entity;

The digital access signaling system protocol entity is: a digital access signaling system layer 2 protocol entity, or a digital access signaling system layer 3 protocol entity.

The present invention also provides a message transmission device based on the DUA protocol, including:

Storage module: store protocol identification information corresponding to different signaling system protocols;

The protocol identification information is interface identification information, and the storage module is specifically used to store interfaces, correspondence between interface identification information and signaling system protocols, and one interface corresponds to at least two interface identification information, and one interface identification corresponds to one signaling system protocol. command system protocol;

Sending module: determine the protocol identification information corresponding to the message to be transmitted according to the information stored in the storage module, and transmit the protocol identification information and the message;

Receiving module: Determine the signaling system protocol corresponding to the message it receives according to the protocol identification information it receives and the information stored in the storage module.

From the description of the above technical solution, it can be seen that by transmitting the message to be transmitted and its corresponding protocol identification information to the receiving end, the receiving end can determine the signaling protocol of the message it receives according to the protocol identification information, so that different signaling Protocol messages can be transmitted through the same interface in the network device, avoiding the phenomenon that messages of different protocols must be transmitted through different interfaces; by carrying the protocol identification information in the message to be transmitted, the receiving end can easily determine The protocol identification information corresponding to the message it receives; the present invention can use the interface identifier in the message to realize the transmission of the protocol identification information without any change to the DUA protocol itself; the present invention can also realize the transmission of the protocol identification information without affecting the sending end and In the case of docking of the receiving end, the reserved bit or idle bit in the public message header of the DUA protocol is used to realize the transmission of the protocol identification information; thus, the technical solution provided by the present invention realizes the saving of network device interface resources and reduces the cost of system networking the goal of.

Description of drawings

Figure 1 is a schematic diagram of the operation of the DPNSS 1 protocol on NGN;

Fig. 2 is a schematic diagram of the message transmission method based on the DUA protocol of the present invention;

FIG. 3 is a schematic structural diagram of a DUA public message header;

FIG. 4 is a schematic structural diagram of a DLCI field;

FIG. 5 is a schematic diagram of a message transmission device based on the DUA protocol of the present invention.

Detailed ways

In actual networking applications, the DPNSS 1 and DASS 2 protocols will run on the same set of devices at the same time, and they need to be carried by the same DUA protocol. For example, the DPNSS 1 and DASS 2 protocols simultaneously carry the same DUA between the SG device and the MGC device Protocol first class. If both the DPNSS 1 protocol and the DASS 2 protocol can be carried on the same DUA protocol and the same E1 or T1 line, and the receiving end can accurately distinguish whether the message it receives is a message of the DPNSS 1 protocol or a message of the DASS 2 protocol , the receiving end can process the messages of different signaling protocols received from the same interface according to the corresponding protocol, so as to effectively save the interface resources of the network device and reduce the system networking cost.

Therefore, the core of the present invention is: set the protocol identification information corresponding to different signaling system protocols, the sending end transmits the message to be transmitted and the protocol identification information corresponding to the message to the receiving end, and the receiving end transmits the message according to the protocol it receives. The identification information determines the signaling system protocol corresponding to the message it receives.

The technical solution provided by the present invention will be further described below based on the core idea of the present invention.

When DUA needs to transparently transmit messages of DPNSS 1 and DASS 2 protocols through the same interface resource between the sender and receiver, such as transparently transmit messages of DPNSS 1 and DASS 2 protocols through the same interface resource between SG and MGC equipment, the receiver The terminal DUA protocol entity needs to identify whether the message it is currently receiving is a message of the DPNSS 1 protocol or a message of the DASS 2 protocol, and after determining the signaling protocol of the message, it needs to send the message to the corresponding signaling protocol for processing.

Since the DUA protocol itself does not have a corresponding "protocol identification bit", if the receiving end needs to identify whether the message it receives from the same interface resource is a message of the DPNSS 1 protocol or a message of the DASS 2 protocol, the sending end needs to correspond to the message it sends. The protocol identification information is transmitted to the receiving end.

The method of transmitting the protocol identification information at the sender is very flexible. For example, the method of transmitting the message and the protocol identification information corresponding to the message can be used separately, or the method of transmitting the message and the protocol identification information corresponding to the message together, that is, the protocol identification information The method by which information is carried in the message to be transmitted to the receiver.

The two specific implementation methods provided by the present invention will be described in detail below by taking the transmission of protocol identification information and messages together as an example.

Method 1: The receiving end uses the interface identifier to distinguish whether the message it receives is a message of the DPNSS 1 protocol or a message of the DASS 2 protocol. Its specific implementation method is:

First of all, it is necessary to set the corresponding relationship between the interface, the interface identifier and the DPNSS 1 protocol and the DASS2 protocol at the receiving end and the sending end. The interfaces here include: E1 interface and T1 interface. The corresponding relationship between the interface identifier and the DPNSS 1 protocol identification information and the DASS 2 protocol identification information is not saved by the DUA protocol, and the corresponding relationship needs to be saved in the specific application.

Since the protocol messages that need to be distinguished in the present invention are: messages of the DPNSS 1 protocol and messages of the DASS 2 protocol, an interface can be set to correspond to two interface identifiers, and an interface identifier corresponds to a signaling system protocol. The "interface identifier" is set by the DUA protocol itself. It is originally used to identify different E1/T1 lines. The present invention gives the interface identifier a new meaning, that is, the present invention defines different " Interface identifier", each interface identifier corresponds to the DPNSS 1 protocol and the DASS 2 protocol.

As in Figure 2, the definition "interface identifier" m corresponds to the DPNSS 1 protocol, and n corresponds to the DASS 2 protocol, but both m and n correspond to the same E1/T1 interface. In this way, when the DUA protocol entity receives messages reported by different "interface identifiers", it can identify whether the currently reported message is a message of the DPNSS 1 protocol or a message of the DASS 2 protocol according to the interface identifier. For example, when the DUA protocol entity receives When the message reported by the "interface identifier" m is received, the DUA protocol entity can identify the message as a DPNSS 1 message, and report the message to the DPNSS 1 protocol for corresponding processing; when the DUA protocol entity receives the "interface identifier" n reported message, the DUA protocol entity can identify the message as a DASS 2 message, and report the message to the DASS 2 protocol for corresponding processing.

Method 1 requires that the receiving end and the sending end connect to each other, such as the SG and the MGC, to negotiate in advance the corresponding relationship between the interface identifier and different signaling protocols, and the receiving end and the sending end device need to save the "interface identifier" and Correspondence between DPNSS 1 protocol and DASS 2 protocol. If the device at one end does not follow this method, it may cause problems for the connection.

Method 2: The DUA protocol adds protocol identification information in the DUA public message header, and the receiving end uses the protocol identification information to identify whether the message it receives is a message of the DPNSS 1 protocol or a message of the DASS 2 protocol. Its specific implementation method is:

Add the "protocol identification information" bit in the DUA protocol. The protocol identification information bit is used to identify whether the message currently sent or received by the DUA protocol is a message of the DPNSS 1 protocol or a message of the DASS 2 protocol. The "protocol identification" bit in the DUA protocol can use the original relevant reserved bits or idle bits in the DUA public message header.

The public message header of DUA is shown in Figure 3, and the structure definition of the DLCI field is shown in Figure 4. From Figure 4, it can be seen that the first 7 bits of the 0th byte in the DLCI field are reserved bits. Any one or more of these reserved bits may be used as "protocol identification information" bits.

For example, when the 0th bit in the DLCI field is set to "0", it indicates that the message currently carrying the DPNSS 1 protocol is identified; when the 0th bit in the DLCI field is "1", it indicates that the message currently carrying the DASS 2 protocol , then, when the DUA protocol entity receives the message reported by the same interface, it can identify whether the currently reported message is a message of the DPNSS 1 protocol or a message of the DASS 2 protocol according to the 0th bit in the DLCI field, that is, when the DUA protocol entity receives When the 0th bit in the DLCI field is "0", the DUA protocol entity can identify the message as a DPNSS 1 message, and report the message to the DPNSS 1 protocol for corresponding processing; when the DUA protocol entity receives the DLCI When the 0th bit in the field is "1", the DUA protocol entity can identify the message as a DASS 2 message, and report the message to the DASS 2 protocol for corresponding processing. In this example, the 0th bit is used as the protocol identification information to describe, and the method of realizing message transmission by using the other one or more reserved bits as the protocol identification information is basically the same as the above description, and will not be described in detail here.

The receiving end and the sending end in the present invention can be: the DPNSS 1L2 protocol entity or the DASS 2L2 protocol entity on the signaling gateway side or the DPNSS 1L3 protocol entity or the DASS 2L3 protocol entity on the media gateway controller side.

The message transmission device based on the DUA protocol provided by the present invention is shown in Fig. 5 .

In Fig. 5, the message transmission device based on the DUA protocol includes: a storage module, a receiving module and a sending module.

The storage module is mainly used to store the protocol identification information corresponding to different signaling system protocols. The stored information can be the corresponding relationship between the interface, the interface identifier and the DPNSS 1 protocol and the DASS 2 protocol, or it can be a protocol of at least one bit The corresponding relationship between the identification information and the DPNSS 1 protocol and the DASS 2 protocol.

The sending module is mainly used to determine the protocol identification information corresponding to the message to be transmitted according to the information stored in the storage module, and transmit the protocol identification information and the message to the opposite end. The method of transmitting the protocol identification information by the sending module is very flexible, such as The method of separately transmitting the message and the protocol identification information corresponding to the message may be used, or the method of transmitting the message and the protocol identification information corresponding to the message together, that is, the protocol identification information shall be carried in the message to be transmitted and transmitted to the receiving end. The method is specifically as described in the above embodiments, and will not be described in detail here.

The receiving module is mainly used to receive the protocol identification information and message transmitted from the opposite end, and determine the signaling system protocol corresponding to the received message according to the protocol identification information and the information stored in the storage module. When the information stored in the storage module is not At the same time, the method for the receiving module to determine the signaling system protocol corresponding to the message is also different, as described in the above embodiment, and will not be described in detail here.

Although the present invention has been described by way of example, those of ordinary skill in the art know that there are many variations and changes in the present invention without departing from the spirit of the invention, and the claims of the application document of the present invention include these variations and changes.

Claims (6)

1. A message transmission method based on DUA protocol, characterized in that, comprising: a. Set the protocol identification information corresponding to different signaling system protocols respectively, the protocol identification information is used to identify the signaling system protocol corresponding to the message; the protocol identification information is interface identification information, and the step a specifically includes: Set the corresponding relationship between interface, interface identification information and signaling system protocol; And one interface corresponds to at least two interface identification information, and one interface identification corresponds to one signaling system protocol; b. The sending end transmits the message based on the DUA protocol of the digital private network signaling system/digital access signaling system user adaptation layer and the protocol identification information corresponding to the message to the receiving end; c. The receiving end determines the signaling system protocol corresponding to the received message according to the received protocol identification information; The step b includes: the sending end carries the protocol identification information corresponding to the message to be transmitted in the message based on the DUA protocol, and transmits it to the receiving end. 2. A kind of message transmission method based on DUA protocol as claimed in claim 1, is characterized in that, described step b specifically comprises: The sending end determines the interface for transmitting the message and the signaling system protocol corresponding to the message; The sending end determines the interface and the interface identification information corresponding to the signaling system protocol, carries the interface identification information in the interface identification field of the message, and transmits it to the receiving end. 3. A kind of message transmission method based on DUA protocol as claimed in claim 2, is characterized in that, described step c specifically comprises: The receiving end obtains the interface identification information in the message it receives; The receiving end determines the signaling system protocol corresponding to the acquired interface identification information according to the interface, the corresponding relationship between the interface identification information and the signaling system protocol. 4. A kind of message transmission method based on DUA protocol as claimed in claim 1, is characterized in that, the signaling system protocol in the described step a comprises: digital private network signaling system protocol, digital access signaling system protocol ; and the sending end and the receiving end are: a digital private network signaling system protocol entity, or a digital access signaling system protocol entity. 5. A kind of message transmission method based on DUA protocol as claimed in claim 4, it is characterized in that, described digital private network signaling system protocol entity is: digital private network signaling system layer 2 protocol entity or digital private network Signaling system layer 3 protocol entity; the digital access signaling system protocol entity is: digital access signaling system layer 2 protocol entity, or digital access signaling system layer 3 protocol entity. 6. A message transmission device based on DUA protocol, characterized in that, comprising: Storage module: store protocol identification information corresponding to different signaling system protocols, the protocol identification information is used to identify the signaling system protocol corresponding to the message; the protocol identification information is interface identification information, and the storage module is specifically used to store Correspondence between interfaces, interface identification information and signaling system protocols, and one interface corresponds to at least two interface identification information, and one interface identification corresponds to one signaling system protocol; Sending module: Determine the protocol identification information corresponding to the message based on the digital private network signaling system/digital access signaling system user adaptation layer DUA protocol that needs to be transmitted according to the information stored in the storage module, and combine the protocol identification information with the The message transmission, the protocol identification information corresponding to the message to be transmitted is carried in the message based on the DUA protocol; Receiving module: Determine the signaling system protocol corresponding to the message it receives according to the protocol identification information it receives and the information stored in the storage module.

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