WO2008128405A1

WO2008128405A1 - IP NETWORK SIGNALING TRANSPORT PROTOCOL BASED OPTIMIZED SYSTEM AND ACHIEVEMENT METHOD thereof

Info

Publication number: WO2008128405A1
Application number: PCT/CN2007/003732
Authority: WO
Inventors: Qingyong Liang; Ningjun Chen; Puran Chen; Tianwei Zhang
Original assignee: Zte Corporation
Priority date: 2007-04-24
Filing date: 2007-12-21
Publication date: 2008-10-30
Also published as: CN101296170A; CN101296170B

Abstract

An IP network signaling transport protocol based optimized system and achievement method thereof. The said system includes MTP2 entity (302), M2UA entity (304) and SCTP entity (307) in SG side and MTP3 entity (310), M2UA entity (312) and SCTP entity (315) in MGC side. Wherein, a transmitting unit (308, 316) is configured respectively in SCTP entity (307, 315) of two sides to send the IP link break message to M2UA entity (340,312) of two sides when IP link break. A receiving unit (305, 313) is configured in the M2UA entity (340, 312) of two sides for receiving the IP link break message sent by the respective transmitting unit (308, 316). A processing unit (306, 314) is configured in M2UA entity (304, 312) of two sides for transmitting separately the exit link service request message indicative of having MTP2 entity (302) of SG side stop message transport and exit link service indication message indicative of having MTP3 entity (310) of MGC side stop message transport based on the received IP link break message.

Description

Optimization system based on IP network signaling transmission protocol and implementation method thereof

Technical field

The invention belongs to the field of softswitch communication, and in particular relates to an optimization system based on an IP network signaling transmission protocol and an implementation method thereof.

Background technique

With the gradual maturity of IP network technology, there is a need to transmit circuit-switched signaling protocols such as SS7 on IP networks. In order to meet this demand, the IETF Network Working Group has set up a special signaling transmission group. The IP network signaling transmission protocol (SIGTRAN protocol) is developed to support the transmission of traditional over IP networks using the Stream Control Transmission Protocol (SCTP). Circuit switched signaling. In 2002, the IETF working group officially released the MTP2 User Adaption Layer (M2UA), which is used to implement message transmission between the Signaling Gateway (SG) and the Media Gateway Controller (MGC). Its main application purpose is to achieve transparent transmission of data messages between the second layer ( ΜΤΡ 2 ) of the messaging part and the third layer ( ΜΤΡ 3 ) of the messaging part. The basic application model of the protocol is shown in FIG. 1, and includes a signaling termination point/signaling transit point (SEP/STP) 101, an SG 105, and an MGC 111, where the SEP/STP 101 includes a 协议3 protocol entity 102 and a 协议2 protocol entity 103. And the MTP1 protocol entity 104, the SG 105 includes a 协议2 protocol entity 106, an MTP1 protocol entity 107, an M2UA protocol entity 108, an SCTP protocol entity 109, and an IP protocol entity 110, and the MTP1 protocol entity 104 and the MTP1 protocol entity 107 use time division multiplexing (TDM). To communicate, the MGC 111 includes an MTP3 protocol entity 112, an M2UA protocol entity 113, an SCTP protocol entity 114, and an IP protocol entity 115, wherein the IP protocol entity 110 and the IP protocol entity 115 communicate using an IP protocol.

At the MGC layer, the M2UA protocol entity provides an MTP3 interface, and converts the upper-layer user MTP3 data message into an M2UA message and sends it to the M2UA protocol entity on the SG side, and simultaneously converts the M2UA message from the SG side into a message delivery part (MTP) primitive. To the MTP3 protocol entity. On the SG side, the M2UA protocol entity provides an MTP3 interface, and converts the M2UA message from the MGC into an MTP primitive, and sends the MTP2 message to the M2UA protocol entity. Through the MGC side and The cooperation of the M2UA protocol entity on the SG side completes the interaction and forwarding of the MTP signaling message and the IP domain MTP signaling message in the traditional circuit domain. In actual commercial use, traditional circuit link interruption between SEP/STP and SG and IP link interruption between SG and MGC often occur. For the traditional circuit interruption between SEP/STP and SG, the MTP3 protocol entity on the SEP/STP and the MTP3 protocol entity on the MGC can use the link still serving to recover the message on the faulty interrupt link. The way RetrieveReq ) sends a message to the other party.

For the IP link interruption between the SG and the MGC, the prior art implementation workflow is as shown in Figure 2, as follows:

Step S201: The MTP3 protocol entity sends an user data message to the M2UA protocol entity.

Step S202, the MGC side M2UA protocol entity converts the user data message into a MAUP (DATA) message of the M2UA protocol entity, and sends the message to the M2UA protocol entity on the SG side. In step S203, the M2UA protocol entity on the SG side further MAUP (DATA) The message is converted into a user data message and sent to the MTP2 protocol entity on the SG side;

Step S204, the SG side MTP2 protocol entity sends a user data indication message to the M2UA protocol entity.

Step S205, the SG side M2UA protocol entity converts the user data indication message into a MAUP (DATA) message, and sends the message to the M2UA protocol entity on the MGC side;

Step S206, the M2UA protocol entity on the MGC side converts the MAUP (DATA) message into a user data indication message, and sends the message to the MTP3 protocol entity on the MGC side;

When the link state query is performed, the IP link is found to be interrupted. The query process includes the following steps:

Step S207, the MGC side MTP3 protocol entity sends a status query cancellation step S208 to the M2UA protocol entity, between the SG side M2UA protocol entity and the MGC side M2UA protocol entity.

The IP link is interrupted; (interruption is only a hypothetical situation)

Step S209, the SG-side MTP2 protocol entity continuously sends a user data indication message to the M2UA protocol entity, and the message is discarded by the M2UA protocol entity. Step S210,

According to the message and status query message, the message is discarded by the M2UA protocol entity;

Step S211: The status query message sent by the MTP3 protocol entity on the MGC side responds with a timeout, and the MTP3 protocol entity on the MGC side sets the link state to be unavailable, and starts the retrieval process.

The retrieving process is a process in which the protocol module MTP3 retrieves the undelivered user data message on the link that has been interrupted, and selects another good link to send the message again.

When the IP link between the SG and the MGC is interrupted, there is no effective notification mechanism in the technology to notify the MTP3 and the MTP2 protocol entity on the SG side in time. Therefore, the existing technology cannot guarantee the MTP3 protocol entity to retrieve the MTP3 protocol entity. The timely completion of the mechanism. Currently, the MTP3 protocol entity detects that the underlying IP link is interrupted only through a scheduled link state query. The interval of this query is usually in the second level. The messages in this time range will be discarded by the M2UA protocol entity. The MTP3 protocol entity will stop sending messages only after the timer expires. The message loss will be large, and also This has caused a waste of resources. When the IP link is interrupted on the SG, the M2UA protocol entity cannot notify the MTP2 protocol entity that the IP link is interrupted. Therefore, the MTP2 layer still sends the message to the M2UA protocol entity, causing packet loss and resource loss. waste. However, MTP2 will be notified of the link interruption only after MTP3 has passed the timed link state detection. Summary of the invention

The technical problem to be solved by the present invention is to provide an optimization system based on an IP network signaling transmission protocol and an implementation method thereof, which solves the problem that the IP link interruption in the prior art causes packet loss of the Layer 2 user adaptation layer of the transmission signaling. Maximum guarantee that no packet loss occurs when the IP link is interrupted.

In order to achieve the above object, the present invention provides an optimization system based on an IP network signaling transmission protocol, including an MTP2 protocol entity on the SG side of the signaling gateway, an M2UA protocol entity and an SCTP protocol entity, and an MTP3 protocol on the MGC side of the media gateway controller. Entity, M2UA protocol entity and SCTP protocol entity, characterized in that

A sending unit is configured in the SCTP protocol entity on the SG side, and is configured to send an IP chain to the M2UA protocol entity on the SG side when the IP link between the SG side and the MGC side is interrupted. Road interruption message

a receiving unit and a processing unit are disposed in the M2UA protocol entity on the SG side, where the receiving unit is configured to receive the IP link interruption message sent by the SG side SCTP protocol entity; the processing unit is configured to receive according to the receiving unit The IP link interruption message is sent to the MTP2 protocol entity on the SG side, and the quit link service request message is used to stop the SG side MTP2 protocol entity from sending the data message;

A sending unit is configured in the SCTP protocol entity on the MGC side, and is configured to send an IP link interruption message to the M2UA protocol entity on the MGC side when the IP link between the SG side and the MGC side is interrupted;

a receiving unit and a processing unit are disposed in the M2UA protocol entity on the MGC side, where the receiving unit is configured to receive the IP link interruption message sent by the MTC side SCTP protocol entity; the processing unit is configured to receive according to the receiving unit The IP link break message is sent to the MTP3 protocol entity on the MGC side to send an exit link service indication message, where the exit link service indication message is used to stop the MGC3 protocol entity from transmitting the data message.

Further, a stopping unit is further disposed in the SG side MTP2 protocol entity, and is configured to

The quit link service request message sent by the processing unit in the M2UA protocol entity of the SG side stops sending a data message to the M2UA protocol entity; and the stop unit is also set in the MTP3 protocol entity of the MGC side, according to the MGC side. The exit link service indication message sent by the processing unit in the M2UA protocol entity stops sending a data message to the M2UA protocol entity.

Further, a triggering unit is further configured in the MGC-side MTP3 protocol entity, and is configured to start a switching rewind data retrieval process according to the exit link service indication message sent by the processing unit.

Further, the exit link service request message and the exit link service indication message carry an exit service cause value, indicating that the exit service cause is an IP link break.

In order to better achieve the above object, the present invention further provides an optimized implementation method based on an IP network signaling transmission protocol, which is used for an MTP2 protocol entity, an M2UA protocol entity, an SCTP protocol entity, and a media gateway of the signaling gateway SG side. MTP3 protocol entity on the MGC side of the controller, A system consisting of an M2UA protocol entity and an SCTP protocol entity, including:

The SCTP protocol entity on the SG side sends an IP link interruption message when the IP link between the SG side and the MGC side is interrupted, and the M2UA protocol entity on the SG side receives the IP link interruption message. And sending an exit link service request message to the MTP2 protocol entity on the SG side according to the IP link interruption message, where the exit link service request message is used to stop the SG side MTP2 protocol entity from sending a data message; The SCTP protocol entity sends an IP link interruption message when the IP link between the SG side and the MGC side is interrupted, and the M2UA protocol entity on the MGC side receives the IP link interruption message according to the IP address. The link interruption message sends an exit link service indication message to the MTP3 protocol entity on the MGC side, where the exit link service indication message is used to stop the MGC side protocol entity from transmitting the data message.

Further, the SG-side MTP2 protocol entity stops transmitting the data message after receiving the exit link service request message; and the MGC-side MTP3 protocol entity stops transmitting the data message after receiving the exit link service indication message.

Further, the MGC-side MTP3 protocol entity starts a switch-back data back-fetching process according to the exit link service indication message.

The system and method provided by the present invention timely notifies the Layer 2 user adaptation layer of the transmission signaling when the IP link is interrupted, thereby stopping the transmission of the data message and starting the data retrieval process, thereby avoiding the occurrence of packet loss.

BRIEF abstract

1 is an application model for implementing transparent transmission of data messages between a second layer of a message passing part and a third layer of a message passing part in the prior art;

2 is a flow chart of a conventional circuit domain MTP signaling message and an IP domain MTP signaling message forwarding and IP link interruption processing in the prior art; 3 is an application model for implementing transparent transmission of data messages between the second layer of the message passing part and the third layer of the message passing part in the present invention;

4 is a flow chart of a conventional circuit domain MTP signaling message and an IP domain MTP signaling message forwarding and IP link interruption processing in the present invention. Preferred embodiment of the invention

The invention modifies the exit link service message (including the exit link service request message and the exit link service indication message) in the traditional No. 7 signaling network, and the modified exit link service message and the IP network SIGTRAN (letter) The IP link interrupt message in the signaling protocol is combined to implement a 4-link link state processing mechanism on the IP interrupt, which reduces packet loss and resource occupation caused by the interruption of the IP link, and quickly recovers the service.

FIG. 3 shows an application model for implementing transparent transmission of data messages between the second layer of the message passing part and the third layer of the message passing part, including SEP/STP 101, SG 301 and MGC 309, wherein SEP/STP 101 includes an MTP3 protocol entity 102, an MTP2 protocol entity 103, and an MTP1 protocol entity 104. The SG 301 includes an MTP2 protocol entity 302, an MTP1 protocol entity 107, an M2UA protocol entity 304, an SCTP protocol entity 307, and an IP protocol entity 110. The MTP2 protocol entity 302 includes a stop unit 303, and the M2UA protocol entity 304 includes a receiving unit 305 and a processing unit 306. The SCTP protocol entity 307 includes a transmitting unit 308. The MGC 309 includes an MTP3 protocol entity 310, an M2UA protocol entity 312, an SCTP protocol entity 315, and an IP protocol entity 115. The MTP3 protocol entity 310 includes a trigger unit 311 and a stop unit 317. The M2UA protocol entity 312 includes a receiving unit 313 and a processing unit 314, SCTP. The protocol entity 315 includes a transmitting unit 316.

The specific instructions are as follows:

The sending unit in the SG side SCTP protocol entity is configured to send an IP link interruption message to the SG side M2UA protocol entity when the IP link is interrupted;

The receiving unit of the M2UA protocol entity on the SG side is configured to receive an IP link interruption message sent by the sending unit of the SCTP protocol entity, and send the message to the processing unit of the M2UA protocol entity for processing;

The processing unit of the M2UA protocol entity on the SG side is mainly responsible for message construction, forwarding, and basic link state maintenance, and the message is an outgoing link service request sent by the MTP2 protocol entity. The message, the quit link service request message is used to notify the SG side MTP2 protocol entity to stop sending data, and the message carries the exit service cause value, indicating that the reason for exiting the service is the IP link is broken;

The stopping unit of the MTP2 protocol entity on the SG side is configured to stop sending data to the M2UA protocol entity after receiving the exit link service request message sent by the M2UA protocol entity;

The sending unit in the SCTP protocol entity of the MGC side is configured to send an IP link interruption message to the M2UA protocol entity on the MGC side when the IP link is interrupted;

The receiving unit of the M2UA protocol entity on the MGC side is configured to receive the IP link interruption message sent by the SCTP protocol entity and send it to the processing unit of the M2UA protocol entity for processing; the processing unit of the M2UA protocol entity on the MGC side is mainly responsible for the message. Constructing, forwarding, and basic link state maintenance, the message is directed to the MTP3 protocol entity sending an exit link service indication message, the exit link service request message is used to stop the MGC side MTP3 protocol entity from transmitting data and triggering it to The link state is set to be unavailable, and the exit link service request message carries an exit service cause value, indicating that the exit service cause is an IP link disconnection;

The stopping unit of the MTP3 protocol entity on the MGC side is configured to stop sending data to the M2UA protocol entity after receiving the exit link service indication message sent by the M2UA protocol entity;

The triggering unit of the MTP3 protocol entity on the MGC side is configured to: after receiving the exit link service indication message sent by the M2UA protocol entity, set the link state to unavailable, and start the switchover reversal and return process.

FIG. 4 is a flowchart of a conventional circuit domain MTP signaling message and an IP domain MTP signaling message forwarding and IP link interruption processing according to the present invention, as follows:

Step S401, the MTP side protocol entity sends an user data message to the M2UA protocol entity.

Step S402, the MGC side M2UA protocol entity converts the user data message into a MAUP (DATA) message of the M2UA protocol entity, and sends the message to the M2UA protocol entity on the SG side. In step S403, the M2UA protocol entity on the SG side further MAUP (DATA) The message is converted into a user data message and sent to the MTP2 protocol entity on the SG side; Step S404, the SG side MTP2 protocol entity sends a user data indication message to the M2UA protocol entity.

Step S405, the SG side M2UA protocol entity converts the user data indication message into a MAUP (DATA) message, and sends the message to the M2UA protocol entity on the MGC side;

Step S406, the M2UA protocol entity on the MGC side converts the MAUP (DATA) message into a user data indication message, and sends the message to the MTP3 protocol entity on the MGC side;

When the link state query is performed, it is found that: the IP link is interrupted, and the query process includes the following steps:

Step S407, the MGC side MTP3 protocol entity sends a status query message to the M2UA protocol entity.

The IP link is interrupted.

Step S409, the receiving unit of the M2UA protocol entity of the SG side receives the IP link interruption message sent by the SCTP protocol entity sending unit, and the processing unit of the M2UA protocol entity sends an exit link service request message to the MTP2 protocol entity;

Step S410, the receiving unit of the M2UA protocol entity of the MGC side receives the IP link interruption message sent by the sending unit of the SCTP protocol entity, and the processing unit of the M2UA protocol entity sends an exit link service indication message to the MTP3 protocol entity.

The above steps 407 and 408, the processing of steps 409 and 410 have no order.

Step S411, the stopping unit of the MTP2 protocol entity on the SG side stops sending data to the M2UA protocol entity.

Step S412, the stopping unit of the MTP3 protocol entity on the MGC side stops sending data to the M2UA protocol entity, and the triggering unit of the MTP3 protocol entity on the MGC side sets the link state to be unavailable, and starts the retrieval process.

Of course, the invention may have other various embodiments without departing from the spirit and spirit of the invention. In this case, those skilled in the art will be able to make various changes and modifications in accordance with the present invention, but the corresponding changes and modifications are intended to fall within the scope of the appended claims.

Industrial applicability

The system and the method provided by the present invention can notify the MGC side 3 protocol entity and the SG side MTP2 protocol entity, that is, the transmission signaling layer 2 user adaptation layer link, to stop sending data messages when the IP link is interrupted. Start the data retrieval process to minimize the loss of information and ensure that system resources are not wasted.

Claims

Claim

An optimization system based on an IP network signaling transmission protocol, comprising an MTP2 protocol entity on the SG side of the signaling gateway, an M2UA protocol entity and an SCTP protocol entity, and an MTP3 protocol entity on the MGC side of the media gateway controller, and an M2UA protocol entity and An SCTP protocol entity, characterized in that

A sending unit is configured in the SCTP protocol entity on the SG side, and is configured to send an IP link interruption message to the M2UA protocol entity on the SG side when the IP link between the SG side and the MGC side is interrupted;

a receiving unit and a processing unit are disposed in the M2UA protocol entity on the MGC side, where the receiving unit is configured to receive the IP link interruption message sent by the MTC side SCTP protocol entity; the processing unit is configured to receive according to the receiving unit The IP link interrupt message is sent to the MTP3 protocol entity on the MGC side to send an exit link service indication message, where the exit link service indication message is used to stop the MGC3 protocol entity from transmitting the data message.

2. The system of claim 1 wherein:

The SG-side MTP2 protocol entity further includes a stop unit, configured to stop sending a data message to the M2UA protocol entity according to the exit link service request message sent by the processing unit in the SG side M2UA protocol entity;

And the stopping unit service indication message sent by the processing unit in the M2UA protocol entity on the MGC side stops to be stopped in the MTC3 protocol entity. The M2UA protocol entity sends a data message

The system according to claim 1, wherein the MTC3 protocol entity further includes a triggering unit, configured to start a switchover according to the exit link service indication message sent by the processing unit. Data retrieval process.

The system according to any one of claims 1 to 3, wherein the exit link service request message and the exit link service indication message carry an exit service cause value, indicating that the reason for exiting the service is The IP link is broken.

5. An optimized implementation method based on the IP network signaling transmission protocol, which is used for the MTP2 protocol entity, the M2UA protocol entity and the SCTP protocol entity on the SG side of the signaling gateway, and the MTP3 protocol entity and the M2UA protocol on the MGC side of the media gateway controller. A system consisting of an entity and an SCTP protocol entity, characterized in that:

The SCTP protocol entity on the SG side sends an IP link interruption message when the IP link between the SG side and the MGC side is interrupted, and the M2UA protocol entity on the SG side receives the IP link interruption message. And sending an exit link service request message to the MTP2 protocol entity on the SG side according to the IP link interruption message, where the exit link service request message is used to stop the SG side MTP2 protocol entity from sending a data message;

When the path is interrupted, the IP link interruption message is sent, and after receiving the IP link interruption message, the M2UA protocol entity on the MGC side sends an exit link service indication to the MTP3 protocol entity on the MGC side according to the IP link interruption message. The message, the exit link service indication message is used to stop the MGC side MTP3 protocol entity from sending a data message.

6. The method of claim 5, wherein

The SG side MTP2 protocol entity stops transmitting the data message after receiving the exit link service request message;

The MGC side MTP3 protocol entity stops transmitting the data message after receiving the exit link service indication message.

7. The method of claim 5, wherein

The MGC-side MTP3 protocol entity starts a switch-back data back-fetching process according to the exit link service indication message.

The method according to any one of claims 5 to 7, wherein the exit link service request message and the exit link service indication message carry an exit service cause value, indicating that the reason for exiting the service is The IP link is broken.