CN1992650B - Method for detecting calling continuity of IP packet carrying network - Google Patents

Abstract

The invention discloses a call continuity detection method of an IP packet bearer network, which is used for judging the type of failure when a call fails, wherein a detection port is set in the network interface unit of the media gateway, and is connected continuously by the first media gateway sending a UDP detection packet to the detection port of the peer media gateway, the first media gateway obtains the UDP detection packet returned by the peer media gateway, calculates transmission parameters, and calculates transmission parameters according to the The transmission parameter of the user datagram protocol detection packet is used to determine the type of the fault. The call continuity detection method of the IP packet bearer network of the present invention detects the call failure in time when a call failure is detected, can accurately and effectively reflect the cause of the failure, and can monitor the IP bearer network and media gateway equipment when the system is abnormal The operation status of the network is convenient for operators to maintain the NGN system.

Description

A call continuity detection method for IP packet bearer network

technical field

The invention relates to the technical field of communication, in particular to a method for detecting call continuity test on an IP packet bearer network. the

Background technique

SoftSwitch (SoftSwitch) and Media Gateway (Media Gateway, MG for short) are core devices in Next Generation Network (NGN for short). Softswitch mainly completes call control, media gateway access control, resource allocation, protocol processing, routing, authentication, billing and other main functions, and provides users with basic voice services, multimedia services, mobile services and diversified third-party services; The media gateway implements the establishment, transmission and release of voice media streams under the control of the softswitch. the

Figure 1 shows the system network diagram of softswitches and media gateways in NGN. The softswitch controls the gateway to complete the call process through the MEGACO (Media Gateway Control, MEGACO) protocol or the MGCP (Media Gateway Control Protocol, MGCP for short) protocol. When user A on one media gateway and user B on another media gateway call to establish an incoming call, an RTP port will be established on the media gateway to encode user A's voice into RTP (RealTransport Protocol, real-time transport protocol) , referred to as RTP) media stream, which is sent to MG2 through the packet switching network; the RTP resource will decode and restore the RTP media stream from user B on another media gateway to voice and send it to user A. The two media gateways implement the call in the same way. In this way, user A and user B realize two-way voice communication. the

If the IP packet bearer network fails or is congested during the user’s call, the user’s call will be interrupted; if the codec of the media gateway and other aspects of the media gateway have problems during the call, the user’s call will also be interrupted . In these two cases, it is difficult to distinguish whether there is a problem with the gateway device itself or a problem with the bearer network. the

The traditional detection method for this kind of call disconnection and inability to connect is to test the IP bearer network after the call is found to be disconnected through post-mortem inspection, and to diagnose the gateway device to locate the fault; One approach is to continuously test the bearer network in some main routing directions. These methods have imperfections. On the one hand, re-testing after a fault occurs is an after-the-fact positioning, and it is difficult to accurately reflect the network and equipment operation at that time; The test cannot cover all IP packet bearer networks that all calls may reach, and a large number of test messages also increases the burden on the IP bearer network. the

Contents of the invention

In order to solve the problem that the network failure cannot be reflected in time in the prior art, and at the same time, it is impossible to completely cover all the IP packet bearer networks that all calls may reach and increase the burden on the IP bearer network, the purpose of the present invention is to provide an IP packet bearer network The call continuity detection method of the network, when the subscriber is interrupted or unable to connect during the call, conducts a continuity test on the IP bearer network in time to accurately and real-time detect the operation of the network. the

In order to achieve the above object, the present invention provides a call continuity detection method of an IP packet bearer network, which is used for judging the type of failure when a call fails, wherein a detection port is set at the network interface unit of the media gateway, and is controlled by The first media gateway continuously sends UDP detection packets to the detection port of the peer media gateway, and the first media gateway calculates transmission parameters after obtaining the UDP detection packets returned by the peer media gateway , wherein, the transmission parameters of the user datagram protocol detection packet include packet loss rate and/or jitter and/or delay; When the transmission parameter threshold is set, the first media gateway judges that the fault type is IP bearer network abnormality, otherwise judges that the fault type is media gateway abnormality. the

The above-mentioned call continuity detection method for an IP packet bearer network, wherein, before the first media gateway continuously sends user datagram protocol detection packets to the detection port of the peer media gateway, the method further includes: The first media gateway judges whether the call fails by comparing the transmission parameters of the media stream of the call with the preset transmission parameter threshold, wherein the transmission parameters of the media stream include packet loss rate and/or jitter and/or time delay. the

In the above call continuity detection method for an IP packet bearer network, when any one of the packet loss rate, jitter, and delay of the media stream is greater than its corresponding threshold value, the first media gateway determines that the call is faulty. the

The call continuity detection method of the IP packet bearer network of the present invention detects the call failure in time when a call failure is detected, can accurately and effectively reflect the cause of the failure, and can monitor the IP bearer network and media gateway equipment when the system is abnormal The operation status of the network is convenient for operators to maintain the NGN system. the

Description of drawings

Figure 1 is a schematic diagram of a network of softswitches and media gateways in an NGN network;

Fig. 2 is a schematic diagram of the direction of UDP packets between the IP bearer network and the media gateway in the call continuity detection process in the present invention;

Fig. 3 is a detailed flow diagram of the present invention. the

Detailed ways

The network interface unit of the media gateway is the interface between the media gateway and the IP bearer network, and is used to connect the media stream from the IP packet bearer network to the inside of the media gateway, and at the same time send the media stream generated by the media gateway to the IP bearer network. the

The network interface unit of the media gateway is provided with a detection port, and the first media gateway continuously sends the UDP detection packet to the detection port of the opposite media gateway, and the first media gateway obtains the UDP detection returned by the opposite media gateway The transmission parameter is calculated after the package is completed, and the fault type is judged according to the transmission parameter of the user datagram protocol detection package. the

The transmission parameters in the present invention include packet loss rate and/or jitter and/or time delay. In a preferred embodiment, the transmission parameters include packet loss rate, jitter and time delay. the

The call continuity detection method of the IP packet bearer network of the present invention is used to actively detect the continuity of the IP bearer network when the voice channel of the media gateway is interrupted or cannot be connected, so as to timely and accurately locate the current call failure. the

In the present invention, at first a detection port is set at the network interface unit of media gateway, is used for the continuous UDP (User Datagram Protocol, User Datagram Protocol) detection packet that receives is returned to the source IP and PORT that sends this UDP detection packet, And set the packet loss rate, delay, and jitter thresholds required for normal calls on the media gateway;

After a call on the media gateway is established and enters the call, the media gateway monitors the media stream on the RTP port of the call in real time through the RTCP (Real Time Control Protocol) protocol. The monitored data includes real-time packet loss rate, real-time jitter , real-time delay; compare the real-time packet loss rate, real-time jitter, and real-time delay with the thresholds of packet loss rate, jitter, and delay to judge the network status. When any of the real-time packet loss rate, real-time jitter, and real-time delay When one is greater than its corresponding threshold, it is judged that the network is faulty;

When it is judged that the network fails, the network interface unit of the media gateway that detects the network failure actively and continuously sends UDP detection packets to the detection port of the peer media gateway;

If the media gateway at the opposite end receives the UDP detection packet at the detection port, it sends the UDP detection packet back to the media gateway that sent the UDP detection packet;

The interface unit of the media gateway that detects a network failure calculates the packet loss rate of the UDP detection packet, the delay of the UDP detection packet, and the jitter of the UDP detection packet according to the received UDP detection packet, and compares the packet loss rate, jitter, and delay If any one of the calculated packet loss rate of UDP detection packets, delay of UDP detection packets, and jitter of UDP detection packets is greater than the corresponding threshold value, report the IP bearer network connectivity to the network management system If the alarm fails to be detected, record the call information corresponding to this detection, otherwise, report the alarm that the media gateway equipment calls abnormally to the network management system, and record the information of this call. the

The method of the present invention will be described in more detail below. the

The IP bearer network shown in Fig. 2 has a media gateway 1, a media gateway 2, and a media gateway 3 respectively, and the network interface units of these media gateways all have the IP bearer network detection function. the

The detection port used to receive the UDP detection packet is set in the network interface unit as PORTD, that is, when receiving the UDP detection packet sent to PORTD on the IP bearer network, the network interface unit uses the source IP address and source PORT number in the UDP detection packet Send the UDP detection packet back to the IP bearer network;

For example, when a UDP detection packet is received, the source IP is 202.202.111.1, the source PORT is 60001, the destination IP is 203.203.222.1, the destination PORT is 65000, and the data content of the UDP detection packet is 12345; then after processing by the network interface unit , change the source IP to 203.203.222.1, the source PORT to 65000, the destination IP to 202.202.111.1, the destination PORT to 60001, and the UDP data content to 12345, and resend it to the IP bearer network;

The network interface unit can actively and continuously send UDP detection packets, and calculate the packet loss rate of UDP detection packets, UDP Detect parameters such as packet delay. the

What Fig. 2 shows is that media gateway 1 discovers that the call to media gateway 2 and media gateway 3 is abnormal, and the UDP detection packet routing trend schematic diagram when media gateway 2 and media gateway 3 are being tested for call continuity. the

A complete process of implementing the call continuity test on the IP bearer network will be described below with reference to FIG. 3 . the

It is assumed that a call is established between media gateway 1 and media gateway 2, and the IP address of media gateway 1 used for this call RTP1 media stream is IP1, and the UDP port number is PORT1; media gateway 2 is used for this call RTP2 The IP address of the media stream is IP2, and the UDP port number is PORT2; assuming that the media gateway 1 first detects that the call is abnormal, the process of realizing the continuity detection of the call on the IP bearer network is shown in Figure 3, including Follow the steps below:

Step 31, setting the threshold values of parameters such as packet loss rate, delay, and jitter that the IP bearer network must have to ensure that the call process is carried out normally. Different values can be dynamically set after the call is established, and a unified value can also be set for all calls of the media gateway;

Step 32, this call is established, user 1 on media gateway 1 and user 2 on media gateway 2 enter into the conversation, and after entering the conversation, media gateway 1 and media gateway 2 perform RTP media flow for this call through the RTCP protocol Real-time monitoring, counting the real-time packet loss rate, real-time jitter and real-time delay of the media stream within 5 seconds every 5 seconds;

Step 33, the media gateway compares the statistical real-time packet loss rate, real-time jitter and real-time delay with the corresponding threshold, when any one of the real-time packet loss rate, real-time jitter, and real-time delay is greater than its corresponding threshold, If it is judged that the network is faulty, go to step 34, otherwise return to step 32;

Step 34, the media gateway 1 performs IP packet bearer network detection between the media gateway 1 and the media gateway 2, specifically including:

Step 341, media gateway 1 sends a command to actively detect the bearer network to its network interface unit, and the command includes the IP address IP1 of the RTP1 media stream used by media gateway 1 in this call and the peer media gateway 2 in this call The IP address IP2 corresponding to the RTP2 media stream;

Step 342, after the network interface unit of media gateway 1 receives the command, it actively and continuously sends UDP detection packets to the detection port PORTD of IP2. When the detection port PORTD receives the UDP detection packet sent to PORTD on the IP bearer network, The source IP address and source PORT number in the UDP return the UDP detection packet to the IP bearer network;

Step 343, the network interface unit of media gateway 1 calculates the packet loss rate of the UDP detection packet, the UDP detection packet according to the sending time of each UDP detection packet sent and whether the packet can be received, and the time of receiving the UDP detection packet again. Parameters such as the delay of the detection packet and the jitter of the UDP detection packet;

Step 35, when any one of the packet loss rate, delay, and jitter of the UDP detection packet is greater than the corresponding threshold, the media gateway 1 reports an abnormal alarm of the IP bearer network to its network management system, and records the information of the call in the alarm information. User 1, local IP1, remote IP2, real-time packet loss rate, real-time jitter, real-time delay, packet loss rate of UDP detection packets, delay of UDP detection packets, and jitter of UDP detection packets used for this call media stream , otherwise, media gateway 1 reports an alarm about the abnormality of media gateway 1 equipment to its network management system, and also records the user 1 of this call, the local IP1, peer IP2, and real-time packet loss rate used by the media stream of this call in the alarm information , Real-time jitter, real-time delay, packet loss rate of UDP detection packets, delay of UDP detection packets, jitter of UDP detection packets;

In step 36, the continuity detection of the IP packet bearer network for this call ends, and the entire call ends after the user hangs up. the

When an abnormality occurs in a call during a call, it is easy to determine the cause of the call failure based on the alarm information recorded in real time in the network management system. the

If the user ends the call at any time during the detection process in step 32, the current call ends, and the entire conduction detection process ends immediately. the

Certainly, the present invention also can have other multiple embodiments, without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and deformations according to the present invention, but these corresponding Changes and deformations should belong to the scope of protection of the appended claims of the present invention. the

Claims (7)

1. the method for detecting calling continuity of an IP packet carrying network is used for carrying out the judgement of fault type when calling is broken down, and it is characterized in that, described method comprises:

Network interface unit in media gateway is provided with detection port, and by the described detection port of first media gateway continuously transmitting user data newspaper protocol detection bag to the opposite end media gateway, described first media gateway is obtained the described User Datagram Protoco (UDP) detection bag back calculating transmission parameter that described opposite end media gateway is returned, wherein, the transmission parameter of described User Datagram Protoco (UDP) detection bag comprises packet loss and/or shake and/or time delay;

Described User Datagram Protoco (UDP) detect bag packet loss, shake, the time Yanzhong any one during greater than the transmission parameter threshold values that sets in advance, described first media gateway judges that described fault type is that the IP bearer network is unusual, otherwise judges that described fault type is a media gateway abnormal.

2. the method for detecting calling continuity of IP packet carrying network according to claim 1 is characterized in that, before described first media gateway continuously transmitting user data newspaper protocol detection bag arrived the described detection port of opposite end media gateway, described method also comprised:

Described first media gateway compares to judge to call out whether break down, wherein, the transmission parameter of described Media Stream comprises packet loss and/or shake and/or time delay by the transmission parameter of the Media Stream that will call out with the transmission parameter threshold values that sets in advance.

3. the method for detecting calling continuity of IP packet carrying network according to claim 2, it is characterized in that, the packet loss of described Media Stream, shake, the time Yanzhong any one during greater than the transmission parameter threshold values that sets in advance, described first media gateway is judged to call out and is broken down.

4. the method for detecting calling continuity of IP packet carrying network according to claim 3 is characterized in that, specifically comprises the steps:

Step 31, the threshold values of setting packet loss, time delay, shake;

Step 32, call conversation are set up, enter conversation after, described first media gateway and described opposite end media gateway are monitored the real-time packet loss of Media Stream, shake and real-time time delay in real time in real time;

Step 33, described first media gateway compares real-time packet loss, shake in real time and real-time time delay with corresponding threshold values, when real-time packet loss, shake in real time, in real time the time Yanzhong any one during greater than the threshold values of correspondence, be judged as to call out and break down, enter step 34, otherwise return step 32;

Step 34, first media gateway is by the detection port active continuously transmitting user data newspaper protocol detection bag of network interface unit to the opposite end media gateway, the opposite end media gateway is received when User Datagram Protoco (UDP) detects bag, it is returned first media gateway, and calculate packet loss, time delay, the shake that User Datagram Protoco (UDP) detects bag by first media gateway;

When step 35, User Datagram Protoco (UDP) detected in the packet loss, time delay, shake of bag any one greater than the threshold values of correspondence, the described first media gateway failure judgement type was that the IP bearer network is unusual, otherwise the failure judgement type is a media gateway abnormal;

Step 36, this conduction detection of calling out the IP packet carrying network finishes, whole end of calling after the wait user on-hook.

5. the method for detecting calling continuity of IP packet carrying network according to claim 4, it is characterized in that, in the described step 35, after first media gateway is judged fault type, also report described fault type and call information to affiliated network management system, described call information comprises user, this calling Media Stream of this conversation used local terminal IP, opposite end IP, packet loss, the time delay of User Datagram Protoco (UDP) detection bag and the shake that the User Datagram Protoco (UDP) detection is wrapped of packet loss, real-time shake, real-time time delay, User Datagram Protoco (UDP) detection bag in real time.

6. the method for detecting calling continuity of IP packet carrying network according to claim 4, it is characterized in that, in the described step 31, the threshold values of packet loss, time delay, shake dynamically arranges behind call setup according to the Media Stream that per call adopted or the all-calls of media gateway is unified to be provided with.

7. the method for detecting calling continuity of IP packet carrying network according to claim 4, it is characterized in that, in the described step 34, the opposite end media gateway detects bag with described User Datagram Protoco (UDP) and returns first media gateway by after received User Datagram Protoco (UDP) being detected the source IP and purpose IP transposing and source port and destination interface transposing that wraps.

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