CN104486359B - Test method and device, the monitoring method and system of the voice quality of IMS network - Google Patents

Test method and device, the monitoring method and system of the voice quality of IMS network Download PDF

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Publication number
CN104486359B
CN104486359B CN201410852988.4A CN201410852988A CN104486359B CN 104486359 B CN104486359 B CN 104486359B CN 201410852988 A CN201410852988 A CN 201410852988A CN 104486359 B CN104486359 B CN 104486359B
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China
Prior art keywords
ims terminal
testing device
ims
monitor supervision
supervision platform
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CN104486359A (en
Inventor
徐勇
陈彦文
张贤德
熊国辉
朱运川
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GAOKE COMMUNICATION TECHNOLOGY Co Ltd GUANGZHOU CITY
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GAOKE COMMUNICATION TECHNOLOGY Co Ltd GUANGZHOU CITY
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/60Network streaming of media packets
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/80Responding to QoS

Abstract

The present invention relates to the test method of the voice quality of IMS network and device, monitoring method and systems.The test method includes:The call request from monitor supervision platform is received, and establishes and calls with corresponding IMS terminal;Receive the sample voice data from the IMS terminal;When reaching the preset air time, terminate to converse with the IMS terminal;Voice quality is calculated according to the sample voice data, and result of calculation is sent to the monitor supervision platform.The present invention only needs to dispose a testing device in IMS network, it will be able to carry out the test of voice quality in real time, automatically to target IMS terminal and carry out the monitoring and tracking of voice quality to all IMS terminals in IMS network.

Description

Test method and device, the monitoring method and system of the voice quality of IMS network
Technical field
The present invention relates to the communication technologys.
Background technology
Existing IMS (IP Multimedia Subsystem) network, has deployed a variety of VOIP (Voice over Internet Protocol) access terminal equipment, these terminal devices provide the various voice industry based on VOIP to the user Business, but since the network quality of IP network itself (packet loss, time delay, shake etc.) fluctuates more frequent, the language of user speech business Sound quality can be also greatly affected.For at present, IMS network shortage effectively tracks the voice quality of VOIP business Means, existing voice quality test method, mainly use dedicated voice quality testing tool and software, in network into Row fixed test (affixes one's name to dedicated test probe equipment, tested with testing tool in network side) in access side, these sides Method or tool generally existing problems with and defect:
1, need the test terminal in user side deployment-specific, execute-in-place inconvenient.
2, the case where limited user access point can only being selected to be tested, being unable to overall monitor whole network.
3, normalization monitoring, analysis long-term trend etc. be cannot achieve.
4, long-range real-time testing can not be carried out, supports analysis traffic issues etc..
5, it needs to purchase dedicated voice quality testing tool.
Invention content
It is an object of the present invention to proposing a kind of test method of the voice quality of IMS network, can solve can not The problem of long-range real-time testing.
One of in order to achieve the above object, the technical solution adopted in the present invention is as follows:
The test method of the voice quality of IMS network is applied in testing device comprising following steps:
Step 1 receives the call request from monitor supervision platform, and establishes and call with corresponding IMS terminal;
Step 2 receives the sample voice data from the IMS terminal;
Step 3 when reaching the preset air time, terminates to converse with the IMS terminal;
Step 4 calculates voice quality according to the sample voice data, and result of calculation is sent to the monitoring and is put down Platform.
Preferably, there are following steps between step 2 and step 3:Receive the RTCP data from IMS terminal;In step 4 Also following steps:Network quality is calculated according to the RTCP data, and network quality is sent to the monitor supervision platform.
Preferably, the sample voice data are stored in advance in IMS terminal or testing device.
The present invention also proposes a kind of test device of the voice quality of IMS network corresponding with above-mentioned test method, answers For in testing device comprising with lower module:
Calling module for receiving the call request from monitor supervision platform, and is established with corresponding IMS terminal and is called;
First receiving module, for receiving the sample voice data from the IMS terminal;
Module being hung up, when for reaching the preset air time, terminating to converse with the IMS terminal;
Computing module for calculating voice quality according to the sample voice data, and result of calculation is sent to described Monitor supervision platform.
The second object of the present invention is to propose a kind of monitoring method of the voice quality of IMS network, can solution must not The case where overall monitor whole network and cannot achieve normalization monitoring, analyze long-term trend the problems such as
In order to achieve the above object two, the technical solution adopted in the present invention is as follows:
The monitoring method of the voice quality of IMS network, the IMS network include monitor supervision platform, testing device and IMS whole End comprising following steps:
Step 1, monitor supervision platform receive end-to-end voice quality detection request, and send test account information to IMS terminal;
Step 2, IMS terminal return to registering result information according to test account information to monitor supervision platform;
Step 3, testing device receive the call request from monitor supervision platform, and establish and call with corresponding IMS terminal;
Step 4, testing device receive the sample voice data from the IMS terminal;
Step 5, when reaching the preset air time, testing device terminates to converse with the IMS terminal;
Step 6, IMS terminal return to deregistration information to monitor supervision platform;
Step 7, testing device calculate voice quality according to the sample voice data, and result of calculation are sent to described Monitor supervision platform.
Preferably, there are following steps between step 4 and step 5:IMS terminal sends RTCP numbers to the testing device According to;There are following steps in step 7:Testing device calculates network quality according to the RTCP data, and network quality is sent To the monitor supervision platform.
Preferably, there are following steps after step 7:Monitor supervision platform shows the result of calculation.
The present invention also proposes a kind of monitoring system of the voice quality of IMS network corresponding with above-mentioned monitoring method, described IMS network includes monitor supervision platform, testing device and IMS terminal comprising with lower module:
Request module is set to monitor supervision platform, for receiving end-to-end voice quality detection request, and is sent out to IMS terminal Send test account information;
Registration module is set to IMS terminal, for according to test account information, registering result letter to be returned to monitor supervision platform Breath;
Calling module is set to testing device, for receiving the call request from monitor supervision platform, and with corresponding IMS Terminal establishes calling;
First receiving module is set to testing device, for receiving the sample voice data from the IMS terminal;
Module is hung up, testing device is set to, when for reaching the preset air time, terminating to lead to the IMS terminal Words;
Cancellation module is set to IMS terminal, for returning to deregistration information to monitor supervision platform;
Computing module is set to testing device, for calculating voice quality according to the sample voice data, and will calculate As a result it is sent to the monitor supervision platform.
Preferably, the first receiving module and hanging up between module also has with lower module:IMS terminal is sent out to the testing device Send RTCP data;Computing module is additionally operable to calculate network quality according to the RTCP data, and network quality is sent to described Monitor supervision platform.
Preferably, also have with lower module after computing module:Monitor supervision platform shows the result of calculation.
The present invention has the advantages that:
It only needs to dispose a testing device in IMS network, it will be able in real time, automatically carry out target IMS terminal The test of voice quality and the monitoring and tracking that voice quality is carried out to all IMS terminals in IMS network.
Description of the drawings
Fig. 1 is the flow chart of the test method of the voice quality of the IMS network of present pre-ferred embodiments;
Fig. 2 is the flow chart of the monitoring method of the voice quality of the IMS network of present pre-ferred embodiments.
Specific implementation mode
In the following, in conjunction with attached drawing and specific implementation mode, the present invention is described further.
Before describing the present invention, technical term of the present invention is explained first.
IMS (IPMultimedia Subsystem) is IP multimedia subsystem, is a kind of completely new multimedia service shape Formula, it disclosure satisfy that the demand of more novel, the more diversified multimedia service of present terminal client.
RTCP (RTP Control Protocol) provides data distribution quality feedback information, this is RTP (Real-time Transport Protocol) as transport protocol partial function and it be related to other transport protocols flow control and Congestion control.
The IMS terminal of the present embodiment refers to the IMS access devices such as IAD, IP PBX, AG, SIP GW.
As shown in Figure 1, a kind of test method of the voice quality of IMS network, is applied in testing device comprising with Lower step:
Step S11, the call request from monitor supervision platform is received, and establishes and calls with corresponding IMS terminal.
Step S12, the sample voice data from the IMS terminal are received, the sample voice data can prestore In IMS terminal or testing device.If sample voice data are stored in testing device, testing device is first to IMS ends End sends sample voice data, then returns to the sample voice data by IMS terminal again.This process simulation user passes through The voice data that IMS terminal generates during making a phone call.
Step S13, the RTCP data from IMS terminal are received.
When step S14, reaching preset air time (such as 60 seconds), terminate to converse with the IMS terminal.
Step S15, voice quality is calculated according to the sample voice data, network quality is calculated according to the RTCP data (such as time delay, packet loss, shake), and result of calculation (including voice quality and network quality) is sent to the monitor supervision platform.Institute Show that voice quality can be MOS (Mean Opinion Score) value.
The present embodiment also proposes a kind of test dress of the voice quality of IMS network corresponding with the test method of the present embodiment It sets, is applied in testing device comprising with lower module:
Calling module for receiving the call request from monitor supervision platform, and is established with corresponding IMS terminal and is called;
First receiving module, for receiving the sample voice data from the IMS terminal;
Second receiving module, for receiving the RTCP data from IMS terminal.
Module being hung up, when for reaching the preset air time, terminating to converse with the IMS terminal;
Computing module calculates net for calculating voice quality according to the sample voice data according to the RTCP data Network quality, and result of calculation is sent to the monitor supervision platform.
As shown in Fig. 2, the present embodiment also proposes a kind of monitoring method of the voice quality of IMS network, the IMS network packet Include monitor supervision platform, testing device and IMS terminal comprising following steps:
Step S21, monitor supervision platform receives end-to-end voice quality detection request, and sends test account letter to IMS terminal Breath;
Step S22, IMS terminal returns to registering result information, to prompt to monitor according to test account information to monitor supervision platform Platform IMS terminal has accessed test link;
Step S23, testing device receives the call request from monitor supervision platform, and establishes and call with corresponding IMS terminal, The IMS terminal that i.e. monitor supervision platform is specified in step S21;
Step S24, testing device receives the sample voice data from the IMS terminal;
Step S25, IMS terminal sends RTCP data to the testing device;
When step S26, reaching the preset air time, testing device terminates to converse with the IMS terminal;
Step S27, IMS terminal returns to deregistration information to monitor supervision platform, to notify monitor supervision platform test to terminate;
Step S28, testing device calculates voice quality according to the sample voice data, is calculated according to the RTCP data Network quality, and result of calculation is sent to the monitor supervision platform.
Step S29, monitor supervision platform shows the result of calculation, and the result of calculation can be with the side such as daily record, chart Voice quality, the variation tendency of network quality is presented in formula.
The present embodiment also proposes a kind of monitoring system of the voice quality of IMS network corresponding with the monitoring method of the present embodiment System, the IMS network includes monitor supervision platform, testing device and IMS terminal comprising with lower module:
Request module is set to monitor supervision platform, for receiving end-to-end voice quality detection request, and is sent out to IMS terminal Send test account information;
Registration module is set to IMS terminal, for according to test account information, registering result letter to be returned to monitor supervision platform Breath;
Calling module is set to testing device, for receiving the call request from monitor supervision platform, and with corresponding IMS Terminal establishes calling;
First receiving module is set to testing device, for receiving the sample voice data from the IMS terminal;
Second receiving module is set to IMS terminal, for sending RTCP data to the testing device;
Module is hung up, testing device is set to, when for reaching the preset air time, terminating to lead to the IMS terminal Words;
Cancellation module is set to IMS terminal, for returning to deregistration information to monitor supervision platform;
Computing module is set to testing device, for calculating voice quality according to the sample voice data, according to described RTCP data calculate network quality, and result of calculation is sent to the monitor supervision platform;
Display module, monitor supervision platform show the result of calculation.
The present invention has following features:
A testing device only need to be deployed in IMS network, testing device can receive the testing that monitor supervision platform is sent Account, testing instruction, are automatically performed the testing process to target UE, including calling is initiated/hung up, and sample voice is sent To opposite end, the loopback voice that opposite end is beamed back is received and preserved, calculates voice quality (MOS values) etc., and result of calculation is returned to Monitor supervision platform.
Monitor supervision platform completes the monitoring and management to terminal device in testing device, net, is manually or automatically set to IMS terminal Standby to carry out testing, the variation of network voice quality is presented with modes such as daily record, charts as a result, assessment voice quality for record testing Trend etc..
IMS terminal equipment need to only do a software upgrading, with the reception and processing for supporting testing to instruct.
The resources such as the IMS accounts that testing uses are provided by operator is unified, and centralized management and dynamic are carried out by monitor supervision platform Distribution uses, and the account and test process used in testing are all transparent to the service-user of terminal, do not influence the normal of terminal user Speech business and charging bill etc..
For those skilled in the art, technical solution that can be as described above and design are made other each Kind is corresponding to be changed and deforms, and all these change and deform the protection model that should all belong to the claims in the present invention Within enclosing.

Claims (6)

  1. The test method of the voice quality of 1.IMS networks, which is characterized in that it is applied in testing device comprising following step Suddenly:
    Step 1 receives the call request from monitor supervision platform, and establishes and call with corresponding IMS terminal;
    Step 2 receives the sample voice data from the IMS terminal;
    Step 3 when reaching the preset air time, terminates to converse with the IMS terminal;
    Step 4 calculates voice quality according to the sample voice data, and result of calculation is sent to the monitor supervision platform;
    There are following steps between step 2 and step 3:Receive the RTCP data from IMS terminal;There is following step in step 4 Suddenly:Network quality is calculated according to the RTCP data, and network quality is sent to the monitor supervision platform;The sample voice number According to being stored in advance in IMS terminal or testing device, if sample voice data are stored in testing device, testing device Sample voice data first are sent to IMS terminal, the sample voice data are then returned to by IMS terminal again.
  2. The test device of the voice quality of 2.IMS networks, which is characterized in that it is applied in testing device comprising with lower die Block:
    Calling module for receiving the call request from monitor supervision platform, and is established with corresponding IMS terminal and is called;
    First receiving module, for receiving the sample voice data from the IMS terminal;
    Second receiving module, for receiving the RTCP data from IMS terminal;
    Module being hung up, when for reaching the preset air time, terminating to converse with the IMS terminal;
    Result of calculation for calculating voice quality according to the sample voice data, and is sent to the monitoring by computing module Platform.
  3. The monitoring method of the voice quality of 3.IMS networks, which is characterized in that the IMS network includes monitor supervision platform, testing device And IMS terminal comprising following steps:
    Step 1, monitor supervision platform receive end-to-end voice quality detection request, and send test account information to IMS terminal;
    Step 2, IMS terminal return to registering result information according to test account information to monitor supervision platform;
    Step 3, testing device receive the call request from monitor supervision platform, and establish and call with corresponding IMS terminal;
    Step 4, testing device receive the sample voice data from the IMS terminal;
    Step 5, when reaching the preset air time, testing device terminates to converse with the IMS terminal;
    Step 6, IMS terminal return to deregistration information to monitor supervision platform;
    Step 7, testing device calculate voice quality according to the sample voice data, and result of calculation are sent to the monitoring Platform;
    There are following steps between step 4 and step 5:IMS terminal sends RTCP data to the testing device;In step 7 also There are following steps:Testing device calculates network quality according to the RTCP data, and network quality is sent to the monitoring and is put down Platform;There are following steps after step 7:Monitor supervision platform shows the result of calculation, the result of calculation can with daily record, Voice quality, the variation tendency of network quality is presented in the modes such as chart.
  4. The monitoring system of the voice quality of 4.IMS networks, which is characterized in that the IMS network includes monitor supervision platform, testing device And IMS terminal comprising with lower module:
    Request module is set to monitor supervision platform, for receiving end-to-end voice quality detection request, and sends and surveys to IMS terminal Try account information;
    Registration module is set to IMS terminal, for according to test account information, registering result information to be returned to monitor supervision platform;
    Calling module is set to testing device, for receiving the call request from monitor supervision platform, and with corresponding IMS terminal Establish calling;
    First receiving module is set to testing device, for receiving the sample voice data from the IMS terminal;
    Second receiving module is set to IMS terminal, for sending RTCP data to the testing device;
    Module is hung up, testing device is set to, when for reaching the preset air time, terminating to converse with the IMS terminal;
    Cancellation module is set to IMS terminal, for returning to deregistration information to monitor supervision platform;
    Computing module is set to testing device, for calculating voice quality according to the sample voice data, and by result of calculation It is sent to the monitor supervision platform.
  5. 5. the monitoring system of voice quality as claimed in claim 4, which is characterized in that the first receiving module and hang up module it Between also have with lower module:IMS terminal sends RTCP data to the testing device;Computing module is additionally operable to according to the RTCP numbers According to calculating network quality, and network quality is sent to the monitor supervision platform.
  6. 6. the monitoring system of voice quality as claimed in claim 4, which is characterized in that also have with lower die after computing module Block:Monitor supervision platform shows the result of calculation.
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Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016179812A1 (en) * 2015-05-13 2016-11-17 华为技术有限公司 Method, device and system for reflecting service continuity result and quality
CN107342877A (en) * 2016-04-29 2017-11-10 展讯通信(上海)有限公司 The method of testing and system of audio frequency of mobile terminal quality
CN108235299B (en) * 2016-12-21 2020-08-28 中国移动通信集团公司 VoLTE media surface quality testing method and device
CN107483293A (en) * 2017-09-14 2017-12-15 郑州云海信息技术有限公司 A kind of network virtualization business function verification method and system
CN110365548B (en) * 2018-04-10 2023-06-20 华为技术有限公司 Network performance measuring method and device
CN109639919B (en) * 2018-11-27 2021-06-01 中国移动通信集团江苏有限公司 Dial testing method, device, equipment and medium
CN114585011A (en) * 2020-11-18 2022-06-03 中移物联网有限公司 Network quality testing method and device

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101111041A (en) * 2007-08-09 2008-01-23 张科任 Mobile communications network remote control detecting system and speech quality remote detecting method
CN101119338A (en) * 2007-09-20 2008-02-06 腾讯科技(深圳)有限公司 Network voice communication method, system, device and instant communication terminal
CN101129773A (en) * 2007-08-15 2008-02-27 佛山德众药业有限公司 Granular formulation, tablet or capsule of black-bone chicken and white phoenix and method of preparing the same
CN101247616A (en) * 2008-03-20 2008-08-20 浙江三维通信股份有限公司 Mobile communications network overlapping effect remote dial testing method based on digital voice technology
CN103067217A (en) * 2012-12-14 2013-04-24 北京思特奇信息技术股份有限公司 Indicating system and method of communication network service quality

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101111041A (en) * 2007-08-09 2008-01-23 张科任 Mobile communications network remote control detecting system and speech quality remote detecting method
CN101129773A (en) * 2007-08-15 2008-02-27 佛山德众药业有限公司 Granular formulation, tablet or capsule of black-bone chicken and white phoenix and method of preparing the same
CN101119338A (en) * 2007-09-20 2008-02-06 腾讯科技(深圳)有限公司 Network voice communication method, system, device and instant communication terminal
CN101247616A (en) * 2008-03-20 2008-08-20 浙江三维通信股份有限公司 Mobile communications network overlapping effect remote dial testing method based on digital voice technology
CN103067217A (en) * 2012-12-14 2013-04-24 北京思特奇信息技术股份有限公司 Indicating system and method of communication network service quality

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