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CN100364293C - Method for handling IP network congestion by Layer 2 user adaptation in message transmission - Google Patents

Method for handling IP network congestion by Layer 2 user adaptation in message transmission Download PDF

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Publication number
CN100364293C
CN100364293C CNB021441138A CN02144113A CN100364293C CN 100364293 C CN100364293 C CN 100364293C CN B021441138 A CNB021441138 A CN B021441138A CN 02144113 A CN02144113 A CN 02144113A CN 100364293 C CN100364293 C CN 100364293C
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congestion
m2ua
message
sctp
signaling
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CN1486043A (en
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叶玲
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to CNB021441138A priority Critical patent/CN100364293C/en
Priority to PCT/CN2003/000787 priority patent/WO2004030274A1/en
Priority to AU2003271018A priority patent/AU2003271018A1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/12—Avoiding congestion; Recovering from congestion
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/26—Flow control; Congestion control using explicit feedback to the source, e.g. choke packets

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

The present invention relates to a message transmission part 2 (MTP2) user matching IP network congestion processing method which comprises the following steps: (1) a congestion indication primitive is defined when congestion of an SCTP happens; an SIB message which informs of the congestion of the local end is sent to the counter end; a congestion indication message which informs of the congestion of the local end and is sent from the local end to the counter end is defined; (2) a congestion indication message is generated, and when the congestion of the SCTP occurs, the flow of the signaling message which is sent to the IP network is controlled through the upper M2UA of the SCTP. When the IP congestion occurs, the congestion report message between the MTP2 and the MTP3 is slickly utilized, and the MTP2 or the MTP3 is informed through the upper user M2UA of the SCTP so as to reduce or stop sending signaling message to the counter party, so that the present invention can reliably control the flow of the signaling messages which are sent to the IP network, effectively relieve IP congestion and prevent signaling messages from losing.

Description

The adaptive processing method congested of 2 layers of user of message transfer part to IP network
Technical field
The present invention relates to broadband telecommunication network becomes particularly a kind of processing of next generation network to use the method for the congestion state of 2 layers of (the MTP2-MessageTransfer Part Layer 2) user message of message transfer part in 2 layers of user of message transfer part adaptive (M2UA-MTP2 (Message Transfer Part Layer 2) User Adaptation) transmission NO.7 signaling message on IP network.
Background technology
In conventional telecommunication network, there have been a series of standards and technology to guarantee the reliability of signaling system, as very ripe arrowband No.7 signaling system at present.Progressively maturation along with the IP packet network technologies, the IP packet network can be used for business such as voice-bearer, data, multimedia, traditional circuit-switched network and packet network are in fusing stage, be to realize the intercommunication of legacy circuit-switched networks network and IP packet network, the demand of circuit switching signaling protocol such as No.7 signaling occurred on IP network, transmitting.In order to satisfy the demand in IP network transmitting signaling agreement, IETF sets up a special signaling transmission group, and the signaling transfer protocol that they formulated will be used for the transmission of legacy circuit-switched signaling protocol on IP network.In the signaling transmission standard of IETF, signaling transfer protocol stack (Signaling Transport, SIGTRAN) form by three parts, as shown in Figure 1, SCTP (Stream ControlTransmission Protocol, SCTP) be a general signaling transfer protocol that is used for IP network, it has guaranteed reliable, the order-preserving transmission of signaling message; The adaptive sublayer of signaling is that the specific high-rise arrowband signaling of being carried is carried out adaptive level, and it upwards provides the special interface of original arrowband signaling to make high-rise arrowband signaling to remain unchanged and has been transmitted in pellucidly on the message of signaling transfer protocol.
M2UA is a MTP2-User Adaptation Layer in the signaling transfer protocol (SIGTRAN), adaptive is MTP2 and MTP3 interface boundary, it is asymmetric agreement, be divided into SG side and ASP side, SG is the SGW that receives and handle the arrowband signaling message at the IP network edge, ASP handles concrete professional application server process, and ASP may be on MGC (Media Gateway Controller).M2UA is responsible on IP network transmitting the user message of MTP2: the primitive of SG being gone up MTP2 and last interlayer is assembled into M2UA message, uses the SCTP connection to pass to MTP3 on the MGC by IP network; The M2UA of ASP side is assembled into M2UA message with the primitive that MTP3 sends to MTP2, uses SCTP to connect by IP network and passes to MTP2 on the SG.M2UA need guarantee that the interface of original MTP3/MTP2 is constant, makes it in the primitive message that transmits reliably on the IP network between MTP2 and MTP3.The networking application model of M2UA as shown in Figure 2.In communication network, the reliability transmission of control signaling required and require very high the propagation delay time of signaling message; And the data traffic on the IP network may be bigger, when IP network occurs when congested, may cause the signaling message time-delay to exceed the requirement of original No.7 net, thereby cause losing message.
When IP network occurs when congested, it is congested to cause SCTP to detect, by indication to the upper strata user report.SCTP sends congested and reception congestion congested being divided into.It is full to send congested finger SCTP transmission buffering area, can not accept upper-layer user's message again, and reception congestion refers to that the reception buffering area of SCTP is full, can not be in the message of accepting opposite end SCTP.Do not stipulate concrete processing method to IP is congested in the M2UA.It is congested that existing discussion to the congested processing scheme of IP is primarily aimed at transmission, and its concrete scheme is as follows:
When SCTP reports when congested, the M2UA of SG side issues native processor fault (LPO-Local Procell Outage) primitive to MTP2, and ASP side M2UA reports the native processor fault to MTP3.
This processing has big defective because in fact IP congested be unidirectional, for example, when SG side SCTP reported IP congested, expression SG should reduce to the message traffic of ASP direction, but ASP should not be affected to the message of SG.If issue LPO to MTP2 this moment,, also can lose the message that the upper strata issues simultaneously, thereby lose the message that ASP is dealt into SG though that MTP2 can not transmit message to the upper strata is congested to reduce.
Summary of the invention
Purpose of the present invention is at the problem of above-mentioned existence, provide a kind of between SG and ASP network take place when congested, effectively alleviate congestion, avoid losing signaling message, and can when congested in short-term, need not interrupt the MTP link traffic and keep original connection and keep the adaptive processing method congested of 2 layers of user of message transfer part of two ends state consistency IP network.
Technical scheme of the present invention is achieved in that the adaptive processing method congested to IP network of 2 layers of user of a kind of message transfer part, and it may further comprise the steps:
1), the congested congested indication of transmission and the SCTP congested elimination indication of transmission to the congested elimination of IP sending direction of M2UA report takes place to the IP sending direction of M2UA report in definition SCTP;
Definition SCTP eliminates indication to the M2UA report from the reception congestion of the congested elimination of IP receive direction from the generation of IP receive direction congested reception congestion indication and SCTP to the M2UA report;
The congested elimination indication of upper-layer user that congested indication of upper-layer user that definition SG side M2UA issues to MTP2 and M2UA issue to MTP2;
The congested elimination indication of signaling link that congested indication of signaling link that definition ASP side M2UA reports to MTP3 and ASP side M2UA report to MTP3;
Congested SIB message takes place in the notice local terminal that definition SG side MTP2 sends to the signaling link opposite end;
Congested congestion level takes place the notice local terminal that definition is mail to the opposite end from local terminal is zero congestion indicating message greater than zero congestion indicating message with from the congestion level that local terminal mails to the congested elimination of notice local terminal of opposite end;
2), produce congestion indicating message, and occurring as SCTP when congested, mail to the signaling message flow quantity of IP network by 2 layers of adaptive control of user of upper-layer user's message transfer part of SCTP.
Above-mentioned steps 2) in, when SCTP take place to send when congested in SGW SG side, the signaling message flow quantity that IP network is mail in M2UA control may further comprise the steps:
2a1), SG side SCTP reports to M2UA congested transmission indication takes place to send;
2a2), SG side M2UA issues the congested indication in upper strata and starts MTP2 to MTP2 and takes place congested to signaling link opposite end transmission SIB message informing MTP2 signaling link opposite end local terminal;
2a3), after the signaling link opposite end receives SIB message, will suspend to local terminal transmission signaling message.
Above-mentioned steps 2a3) finish after when the congested elimination of SCTP, its processing may further comprise the steps:
2a4), SG side SCTP reports to M2UA and sends congested elimination indication;
2a5), SG side M2UA issues the congested elimination indication of upper-layer user to MTP2, MTP2 stops to send SIB message to the signaling link opposite end;
2a6), the proper communication of signaling message is recovered to send to local terminal in the signaling link opposite end.
Above-mentioned steps 2) when controlling the signaling message flow quantity that mails to IP network, SCTP M2UA when application server AS P side generation transmission is congested may further comprise the steps in:
2b1), ASP side SCTP reports to M2UA and sends congested indication;
2b2), ASP side M2UA reports the congested indication of signaling link to MTP3;
2b3), ASP side MTP3 receives and reduces behind the congested indication or do not send signaling message to this signaling link.
Above-mentioned steps 2b2) finish after, when the congested elimination of SCTP, its processing may further comprise the steps:
2b4), M2UA reports the congested elimination indication of signaling link to MTP3, MTP3 recovers to send message to this signaling link.
As SCTP during at SG side generation reception congestion, the signaling message flow quantity that IP network is mail in M2UA control may further comprise the steps in the above-mentioned steps 2:
2c1), SG side SCTP reports the reception congestion indication to M2UA;
2c2), SG side M2UA sends congestion level greater than zero congestion indicating message to ASP side opposite end;
2c3), the M2UA of ASP side converts thereof into the congested indication notice of signaling link MTP3 after receiving congestion indicating message;
2c4), after ASP side MTP3 receives the congested indication of signaling link notice, reduce or do not send out message to this signaling link.
Above-mentioned steps 2c4) finish after, when the SCTP reception congestion was eliminated, its processing may further comprise the steps:
2c5), SG side SCTP reports reception congestion to eliminate indication to M2UA;
2c6), SG side M2UA is zero congested elimination Indication message to the congestion level that ASP side opposite end sends congested elimination;
2c7), M2UA is converted to the congested elimination indication notice of signaling link MTP3 with congested elimination indication;
2c8), after MTP3 receives the congested elimination indication of signaling link, recover to this signaling link issuing message.
Above-mentioned steps 2) as SCTP during at ASP side generation reception congestion, the signaling traffic that IP network is mail in M2UA control may further comprise the steps in:
2d1), ASP side SCTP reports the reception congestion indication to M2UA;
2d2), greater than zero congestion indicating message, SG side M2UA starts MTP2 to signaling link opposite end transmission SIB message after receiving congestion indicating message to ASP side M2UA to SG side opposite end transmission congestion level;
2d3), the transmission signaling message is suspended or reduced in the signaling link opposite end to local terminal after receiving SIB message.
Above-mentioned steps 2d3) finish after, when the congested elimination of SCTP, its processing may further comprise the steps:
2d4), ASP side SCTP reports the reception congestion indication to M2UA;
2d5), ASP side M2UA is zero congestion indicating message to SG side opposite end transmission congestion level;
2d6), SG side M2UA receives that indication MTP2 stops to send SIB message to the opposite end after the above-mentioned message, the signaling link opposite end will be recovered to local terminal transmission signaling message.
The present invention is owing to utilize congested report message between MTP2 and the MTP3 to take place at IP that the upper-layer user M2UA by SCTP notifies MTP2 or MTP3 to reduce or suspends the transmission signaling message to the other side when congested dexterously, thereby the signaling message flow quantity of IP network is mail in control reliably, effectively alleviate the IP congestion condition and avoid losing of signaling message, and when generation is congested in short-term, need not interrupt the business of MTP link, can keep original connection and keep the two ends state consistency, reach purpose of the present invention.
Describe the implementation procedure of invention in detail below in conjunction with accompanying drawing;
Description of drawings
Fig. 1 forms schematic diagram by the structure of signaling transfer protocol stack at present stage;
Fig. 2 is the networking application model schematic diagram of existing M2UA;
Fig. 3 is that M2UA of the present invention to SCTP congested process chart takes place to send;
Fig. 4 is the process chart that reception congestion takes place SG side SCTP of the present invention;
Fig. 5 is the process chart that reception congestion takes place ASP side SCTP of the present invention;
Embodiment
As Fig. 3--shown in Figure 5, the processing method that 2 layers of user adaptation of message transfer part of the present invention are congested to IP network may further comprise the steps:
1., congested congested indication and the congestion level of notifying the congested elimination of SCTP of definition notice SCTP (SCTP--Stream ControlTransfer Protocol) generation is zero congested indication; And congested busy condition indication (SIB-Status Indication of Busy) message takes place in a notice local terminal that sends to the opposite end;
Defining a notice local terminal that mails to the opposite end from local terminal, congestion level that congested congested indication (Congestion Indication) message and one mails to the congested elimination of notice local terminal of opposite end from local terminal takes place is zero congested indication (Congestion Leve1=0, CongestionIndication) message;
2., produce congestion indicating message, and occurring as SCTP when congested, mail to the signaling message flow quantity of IP network by 2 layers of user of upper-layer user's message transfer part of SCTP adaptive (M2UA--MTP2 (Message Transfer PartLayer2) User Adaptation) control.
Wherein M2UA control is mail to the congested kind of the treatment S CTP of signaling message flow quantity of IP network and the difference of position has different processing methods fully to reach purpose of the present invention with the needs that adapt to various congestion states in the above-mentioned steps 2, when SCTP take place to send when congested in the SG side, the signaling message flow quantity that IP network is mail in M2UA control may further comprise the steps:
2a1), M2UA issues the congested indication in upper strata and starts MTP2 to MTP2 and takes place congested by signalling system No.7 to signal link opposite end transmission SIB message informing MTP2 opposite end local terminal;
2a2), after the signaling link opposite end receives SIB message, will suspend to local terminal transmission signaling message;
This moment, its processing may further comprise the steps when the congested elimination of SCTP:
2a3), M2UA issues congested elimination indication to MTP2, MTP2 stops to send SIB message to the signaling link opposite end;
2a4), the proper communication of signaling message is recovered to send to local terminal in the signaling link opposite end.
The signaling message flow quantity that mails to IP network when SCTP M2UA control when ASP side generation transmission is congested may further comprise the steps:
2b1), M2UA is to the congested indication of MTP3 reporting links;
2b2), MTP3 receives and reduces behind the congested indication or do not send signaling message to this signaling link
This moment, its processing may further comprise the steps when the congested elimination of SCTP:
2b3), M2UA is to the congested elimination indication of MTP3 reporting links, MTP3 recovers to send message to this signaling link.
As SCTP during at SG side generation reception congestion, the signaling message flow quantity that IP network is mail in M2UA control may further comprise the steps:
2c1), M2UA sends congestion indicating message to the ASP side;
2c2), the M2UA of ASP side converts thereof into the congested indication notice of signaling link MTP3 after receiving congestion indicating message;
2c3), after MTP3 receives link congestion indication notice, reduce or do not send out message back SG side.
This moment, its processing may further comprise the steps when the congested elimination of SCTP:
2c4), M2UA is zero congestion indicating message notice MTP3 to the congestion level that the ASP side sends congested elimination;
2c5), after MTP3 receives above-mentioned message, recover to send message to the signaling link opposite end.
As SCTP during at ASP side generation reception congestion, the signaling traffic that IP network is mail in M2UA control may further comprise the steps:
2d1), M2UA sends congestion indicating message to the SG side, SG side M2UA receives that starting MTP2 behind the congestion indicating message sends SIB message to the signaling link opposite end;
2d2), the transmission signaling message is suspended or reduced in the signaling link opposite end to local terminal after receiving SIB message.
This moment when the congested elimination of SCTP, its processing may further comprise the steps:
2d3), M2UA is zero congestion indicating message to the congested congestion level that disappears of SG side transmission;
2d4), SG side M2UA receives that indication MTP2 stops to send SIB message to the opposite end after the above-mentioned message, the signaling link opposite end will be recovered to local terminal transmission signaling message.

Claims (9)

1.一种消息传输部分2层用户适配对IP网络拥塞的处理方法，其特征在于包括以下步骤：1. a kind of message transmission part 2 layers of users are adapted to the processing method of IP network congestion, it is characterized in that comprising the following steps: 1)、定义流控制传输协议SCTP向消息传输部分2层M2UA报告的IP发送方向发生拥塞的发送拥塞指示原语和SCTP向M2UA报告的工P发送方向拥塞消除的发送拥塞消除指示原语；1), define the flow control transmission protocol SCTP to the message transmission part 2 layers of M2UA report IP sending direction congestion sending congestion indication primitive and SCTP report to M2UA IP sending direction congestion elimination sending congestion elimination instruction primitive; 定义SCTP向M2UA报告从IP接收方向发生拥塞的接收拥塞指示原语和SCTP向M2UA报告从IP接收方向拥塞消除的接收拥塞消除指示原语；Define SCTP to report to M2UA the reception congestion indication primitive of congestion from IP reception direction and SCTP to report to M2UA the reception congestion elimination indication primitive of IP reception congestion elimination; 定义信令网关SG侧M2UA向MTP2下发的上层用户拥塞指示原语和M2UA向MTP2下发的上层用户拥塞消除指示原语；Define the upper-layer user congestion indication primitive issued by the signaling gateway SG side M2UA to MTP2 and the upper-layer user congestion elimination instruction primitive issued by M2UA to MTP2; 定义ASP侧M2UA向MTP3上报的信令链路拥塞指示原语和ASP侧M2UA向MTP3上报的信令链路拥塞消除指示原语；Define the signaling link congestion indication primitive reported by the ASP side M2UA to the MTP3 and the signaling link congestion elimination indication primitive reported by the ASP side M2UA to the MTP3; 定义SG侧MTP2发送给信令链路对端的通知本端发生拥塞的SIB消息；Define the SIB message sent by MTP2 on the SG side to the peer end of the signaling link to notify the local end of congestion; 定义从本端发往对端的通知本端发生拥塞的拥塞级别大于零的拥塞指示消息和从本端发往对端的通知本端拥塞消除的拥塞级别为零的拥塞指示消息；Define the congestion indication message sent from the local end to the peer end to notify the local end of congestion and the congestion level is greater than zero, and the congestion indication message sent from the local end to the peer end to notify the local end of congestion cancellation and the congestion level is zero; 2)、产生拥塞指示消息，并在当SCTP出现拥塞时，通过SCTP的上层用户消息传输部分2层用户适配控制发往IP网的信令消息流量。2) Generate a congestion indication message, and when the SCTP is congested, the upper layer user message transmission part of the SCTP layer 2 user adapts and controls the flow of signaling messages sent to the IP network. 2.根据权利要求1所述消息传输部分2层用户适配对IP网络拥塞的处理方法，其特征在于上述步骤2)中，当SCTP在信令网关SG侧发生发送拥塞时，M2UA控制发往IP网的信令消息流量包括以下步骤：2. according to claim 1, the processing method of layer 2 user adaptation of message transmission part to IP network congestion is characterized in that in the above-mentioned step 2), when SCTP sends congestion at the signaling gateway SG side, M2UA controls sending to The signaling message flow of the IP network includes the following steps: 2a1)、SG侧SCTP向M2UA上报发生发送拥塞的发送指示原语；2a1), the SCTP on the SG side reports to the M2UA the sending indication primitive of sending congestion; 2a2)、SG侧M2UA向MTP2下发上层拥塞指示原语并启动MTP2向信令链路对端发送SIB消息通知MTP2信令链路对端本端发生拥塞；2a2), the M2UA on the SG side sends an upper layer congestion indication primitive to MTP2 and starts MTP2 to send a SIB message to the peer end of the signaling link to notify the peer end of the MTP2 signaling link that congestion occurs at its own end; 2a3)、信令链路对端接收SIB消息后，将暂停向本端发送信令消息。2a3). After receiving the SIB message, the peer end of the signaling link will suspend sending the signaling message to the local end. 3.根据权利要求2所述消息传输部分2层用户适配对IP网络拥塞的处理方法，其特征在于上述步骤2a3)完成后当SCTP拥塞消除时，其处理包括以下步骤：3. according to the processing method of the user adaptation of the 2 layers of message transmission part of claim 2 to IP network congestion, it is characterized in that after above-mentioned steps 2a3) when SCTP congestion is eliminated, its processing comprises the following steps: 2a4)、SG侧SCTP向M2UA上报发送拥塞消除指示原语；2a4), the SG side SCTP reports to the M2UA to send the congestion elimination instruction primitive; 2a5)、SG侧M2UA向MTP2下发上层用户拥塞消除指示原语，MTP2停止向信令链路对端发送SIB消息；2a5), the M2UA on the SG side sends the upper-layer user congestion elimination instruction primitive to the MTP2, and the MTP2 stops sending the SIB message to the peer end of the signaling link; 2a6)、信令链路对端恢复向本端发送信令消息的正常通信。2a6), the peer end of the signaling link resumes the normal communication of sending signaling messages to the local end. 4.根据权利要求1所述消息传输部分2层用户适配对IP网络拥塞的处理方法，其特征在于上述步骤2)中当SCTP在应用服务器ASP侧发生发送拥塞时M2UA控制发往IP网的信令消息流量包括以下步骤：4. according to the described message transmission part 2 layers of user adaptation of the processing method of IP network congestion according to claim 1, it is characterized in that in above-mentioned step 2) when SCTP sends congestion when application server ASP side takes place, M2UA controls and sends to IP network Signaling message traffic consists of the following steps: 2b1)、ASP侧SCTP向M2UA上报发送拥塞指示原语；2b1), the SCTP on the ASP side reports and sends the congestion indication primitive to the M2UA; 2b2)、ASP侧M2UA向MTP3上报信令链路拥塞指示原语；2b2), the ASP side M2UA reports the signaling link congestion indication primitive to the MTP3; 2b3)、ASP侧MTP3接收到拥塞指示原语后减少或不向该信令链路发送信令消息。2b3), MTP3 on the ASP side reduces or does not send signaling messages to the signaling link after receiving the congestion indication primitive. 5.根据权利要求4所述消息传输部分2层用户适配对IP网络拥塞的处理方法，其特征在于上述步骤2b2)完成后，当SCTP拥塞消除时，其处理包括以下步骤：5. according to the described message transmission part 2 layers of user adaptation of the processing method of IP network congestion according to claim 4, it is characterized in that after above-mentioned step 2b2) finishes, when SCTP congestion eliminates, its processing comprises the following steps: 2b4)、M2UA向MTP3上报信令链路拥塞消除指示原语，MTP3恢复向该信令链路发送消息。2b4), M2UA reports signaling link congestion elimination instruction primitive to MTP3, and MTP3 resumes sending messages to the signaling link. 6.根据权利要求1所述消息传输部分2层用户适配对IP网络拥塞的处理方法，其特征在于上述步骤2中当SCTP在SG侧发生接收拥塞时，M2UA控制发往IP网的信令消息流量包括以下步骤：6. According to claim 1, the message transmission part layer 2 user adaptation method for processing IP network congestion is characterized in that in the above step 2, when SCTP receives congestion on the SG side, the M2UA controls the signaling sent to the IP network Message flow consists of the following steps: 2c1)、SG侧SCTP向M2UA上报接收拥塞指示原语；2c1), the SCTP on the SG side reports the received congestion indication primitive to the M2UA; 2c2)、SG侧M2UA向ASP侧对端发送拥塞级别大于零的拥塞指示消息；2c2), the M2UA on the SG side sends a congestion indication message with a congestion level greater than zero to the peer end on the ASP side; 2c3)、ASP侧的M2UA收到拥塞指示消息后将其转换成信令链路拥塞指示原语通知MTP3；2c3), after receiving the congestion indication message, the M2UA on the ASP side converts it into a signaling link congestion indication primitive and notifies MTP3; 2c4)、ASP侧MTP3收到信令链路拥塞指示原语通知后，减少或不发消息到该信令链路上。2c4). After receiving the signaling link congestion indication primitive notification, the MTP3 on the ASP side reduces or does not send messages to the signaling link. 7.根据权利要求6所述消息传输部分2层用户适配对IP网络拥塞的处理方法，其特征在于上述步骤2c4)完成后，当SCTP接收拥塞消除时，其处理包括以下步骤：7. according to the processing method of 2 layers of user adaptations of the message transmission part of claim 6 to IP network congestion, it is characterized in that after above-mentioned steps 2c4) finish, when SCTP receives congestion and eliminates, its processing comprises the following steps: 2c5)、SG侧SCTP向M2UA上报接收拥塞消除指示原语；2c5), the SG side SCTP reports to the M2UA the received congestion elimination instruction primitive; 2c6)、SG侧M2UA向ASP侧对端发送拥塞消除的拥塞级别为零的拥塞消除指示消息；2c6), the M2UA on the SG side sends a congestion elimination instruction message whose congestion level is zero to the peer end on the ASP side; 2c7)、M2UA将拥塞消除指示原语转换为信令链路拥塞消除指示原语通知MTP3；2c7), the M2UA converts the congestion elimination indication primitive into the signaling link congestion elimination indication primitive and notifies MTP3; 2c8)、MTP3收到信令链路拥塞消除指示原语后，恢复向该信令链路下发消息。2c8), MTP3 resumes sending messages to the signaling link after receiving the signaling link congestion elimination instruction primitive. 8.根据权利要求1所述消息传输部分2层用户适配对IP网络拥塞的处理方法，其特征在于上述步骤2)中当SCTP在ASP侧发生接收拥塞时，M2UA控制发往IP网的信令流量包括以下步骤：8. according to the described message transmission part 2 layers of user adaptation of the processing method of IP network congestion according to claim 1, it is characterized in that in above-mentioned step 2) when SCTP receives congestion at the ASP side, M2UA controls the message sent to IP network Ordering traffic involves the following steps: 2d1)、ASP侧SCTP向M2UA上报接收拥塞指示原语；2d1), the SCTP on the ASP side reports the received congestion indication primitive to the M2UA; 2d2)、ASP侧M2UA向SG侧对端发送拥塞级别大于零的拥塞指示消息，SG侧M2UA收到拥塞指示消息后启动MTP2向信令链路对端发送SIB消息；2d2), the M2UA on the ASP side sends a congestion indication message with a congestion level greater than zero to the peer end on the SG side, and the M2UA on the SG side starts MTP2 to send a SIB message to the peer end of the signaling link after receiving the congestion indication message; 2d3)、信令链路对端接收到SIB消息后暂停或减少发送信令消息给本端。2d3). After receiving the SIB message, the peer end of the signaling link suspends or reduces sending of signaling messages to the local end. 9.根据权利要求8所述消息传输部分2层用户适配对IP网络拥塞的处理方法，其特征在于上述步骤2d3)完成后，当SCTP拥塞消除时，其处理包括以下步骤：9. according to the processing method of 2 layers of user adaptations of the message transmission part of claim 8 to IP network congestion, it is characterized in that after above-mentioned steps 2d3) finish, when SCTP congestion eliminates, its processing comprises the following steps: 2d4)、ASP侧SCTP向M2UA上报接收拥塞指示原语；2d4), the SCTP on the ASP side reports the received congestion indication primitive to the M2UA; 2d5)、ASP侧M2UA向SG侧对端发送拥塞级别为零的拥塞指示消息；2d5), the M2UA on the ASP side sends a congestion indication message with a congestion level of zero to the peer end on the SG side; 2d6)、SG侧M2UA收到上述消息后指示MTP2停止向对端发送SIB消息，信令链路对端将恢复向本端发送信令消息。2d6). After receiving the above message, the M2UA on the SG side instructs MTP2 to stop sending SIB messages to the peer end, and the peer end of the signaling link will resume sending signaling messages to the local end.
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