CN101437247B

CN101437247B - Test method for evaluating voice quality

Info

Publication number: CN101437247B
Application number: CN200810163359.5A
Authority: CN
Inventors: 祝瑾华; 朱贤斌; 陈迪飞
Original assignee: China Mobile Group Zhejiang Co Ltd
Current assignee: China Mobile Group Zhejiang Co Ltd
Priority date: 2008-12-18
Filing date: 2008-12-18
Publication date: 2015-04-01
Anticipated expiration: 2028-12-18
Also published as: CN101437247A

Abstract

The invention discloses a test method for evaluating voice quality, and belongs to the technical field of wireless communication network monitoring. The test method for evaluating the voice quality is applied to wireless communication networks and comprises the following steps: a test center initiates a test through a tandem exchange and calls through a BICC signaling according to a specified route, a call returns to the test center and enters a communication state, simultaneously builds voice channels and bidirectionally sends a special numeric encoding voice signals, namely high frequency signals of common dual-tone multifrequency signals change and low frequency signals of the common dual tone multifrequency signals do not change; and single pass, crosstalk and voice quality of the route are statistically analyzed according to the sending and receiving special numeric encoding voice signals. The test method for evaluating the voice quality realizes testing function for the special numeric encoding voice signals out of band.

Description

A kind of method of testing for assessment of voice quality

Technical field

The invention belongs to cordless communication network monitoring technique field, be specifically related to a kind of method of testing for assessment of voice quality.

Background technology

Along with going deep into of China Mobile network IPization, except voice service, will there will be increasing IP-based multimedia service, also bring the problem of more network, business and customer experience, O&M faces new challenges simultaneously.But the non-telecom level characteristics of IP network itself, network IPization is faced with the problem of many O&M aspects: as fault location is difficult, alarm cannot link, quality of service cannot associate the problems such as each network quality.

In prior art, application number is disclose a kind of end-to-end speech automatic Quality Testing System and method thereof in the Chinese patent application file of " 200510048289.5 ".The phones that this end-to-end speech automatic Quality Testing System and method thereof utilize sound card to control two access NGN are conversed, and need configuration NGN phone, namely dispose probe, build and maintenance cost higher; The PESQ score representing voice quality can only be calculated, the phonetic problem such as single-pass, cross-talk can not be monitored.In addition, application number is disclose a kind of dialing monitoring system for communication network failure investigation and monitoring method thereof in the Chinese patent application file of " 200710067308.8 ".System and corresponding network element to be measured set up loop, and send, receive and comparison touch-tone signal, the phonetic problem such as single-pass, cross-talk can be monitored, but after the speech business of Softswitch starts to be carried on IP bearer network, because touch-tone signal is carried in in-band signalling, do not transmit in voice channel, common touch-tone signal can not reflect voice quality; This system can not calculate the PESQ score representing voice quality simultaneously.

Summary of the invention

For solving problems of the prior art, the present invention aims to provide a kind of method of testing for assessment of voice quality, realizes the outer special number encoding speech signal test function of band.

The described method of testing for assessment of voice quality, be applied to cordless communication network, comprise the following steps: test center initiates test by tandem exchange, according to the route of specifying, made a call by BICC signaling, and be looped back to test center, enter talking state, set up voice channel, two-way transmission special number encoding speech signal simultaneously, namely common touch-tone signal high-frequency signal part change and low frequency signal part is constant; According to the special number encoding speech signal of transmitting-receiving, single-pass, cross-talk and voice quality under this route of statistical analysis.

The described method of testing for assessment of voice quality, the heart is set up in loopback test passage in testing, according to specified circuit by network element code set synthesize called number, formed calling loopback.

The described method of testing for assessment of voice quality, realizes when not needing the whole network to dispose probe, can accomplish a bit to have accessed the whole network test, have nothing to do with Softswitch producer, is applicable to coordinating with all kinds of producer testing; The construction cost of reduction system and maintenance cost; Adopt the identifiable design audio digital signals of special establishment to encode, make this signal in different loading network, all transmit in voice channel.Thus realize the outer special number encoding speech signal test function of band, as voice metrics and MOS voice quality analysis such as single-pass, cross-talk, echoes.

Accompanying drawing explanation

Fig. 1 is the network implementation structure chart of method of testing one embodiment of the present invention.

Fig. 2 is the network implementation structure chart of mobile service monitoring system.

Fig. 3 is the schematic flow sheet of method of testing of the present invention.

Fig. 4 is digital speech testing schematic diagram.

Embodiment

Now in conjunction with Figure of description, describe a preferred embodiment of the present invention in detail.

Shown in Fig. 2, mobile service monitoring system (i.e. relay-type auto-dial testing system) is as test center, this mobile service monitoring system is by direct-connected with signaling in core net, voice network, simulation MSC/VLR function, realize the emulation testing of business, as switch and circuit test, virtual net operational trials, Familiarity Number test, Ring Back Tone service test, short message service test etc.Tester is after mobile service monitoring system assigns test assignment, and system adopts the IAM message in Signaling System Number 7 BICC to make a call, and concrete method of testing is as follows, see Fig. 1:

Pre-conditioned: assuming that business monitoring system switch is numbered 999, SSA3 be numbered 187, Hangzhou GS8 is numbered 108; Test caller: 17242001; Test called: 17240108187999.

Test route: mobile service monitoring system → soft switch A office (Hangzhou SSA3) → Hangzhou GS8 → soft switch A office (Hangzhou SSA3) → mobile service monitoring system (loopback).

Concrete steps: business monitoring system makes a call and gives soft switch A office (Hangzhou SSA3), and caller is 17242001, and called is 17240108187999; SSA3 analyzes rear 3 switches coding 108 of called prefix 17240, and inquiry acquisition 108 be Hangzhou GS8, then by after these 3 codings 108 removals, calling is given Hangzhou GS8 (caller: 17242001, called: 17240187999); After Hangzhou GS8 receives calling, rear 3 switches coding 187 of same analysis called prefix 17240, inquiry acquisition 187 is Hangzhou SSA3, after then being removed by these 3 codings 187, calling is given Hangzhou SSA3 (caller: 17242001, called: 17240999); SSA3 analyzes rear 3 switches coding 999 of called prefix 17240, inquiry acquisition 999 is mobile service monitoring system, then by these 3 coding 999 remove after, calling is given mobile service monitoring system (caller: 17242001, called: 17240); Calling forms loopback; BICC enters talking state, sets up voice channel simultaneously after calling out loopback, sends special number encoding speech signal; According to the special number encoding speech signal of transmitting-receiving, the situation such as single-pass, cross-talk and voice quality under this route of statistical analysis.

In voice call process, produce discernible audio digital signals coding, audio digital signals is transmitted in voice channel, detect audio digital signals waveform at receiver side, identify corresponding digital coding.Fundamental diagram as shown in Figure 4, when sending voice digital signal, produces the waveform signal of corresponding signal frequency by audio digital signals generator; The special establishment of audio digital signals, makes this signal in different loading network, all transmits in voice channel; Recipient, detected the digital speech comprised in voice signal by audio digital signals detector.

For ensureing audio digital signals transmission and identify reliable and accurately, audio digital signals adopts the high and low frequency sinusoidal signal combination of dual-tone multifrequency.Worked out 16 digital speech signal codings altogether at present, respective frequencies combination is as follows: low frequency signal is constant, only revises high-frequency signal part, see table 1, table 2.So just constitute special touch-tone signal, thus realize the outer special number encoding speech signal test function of band, guarantee that this signal is in different loading network, all transmits in voice channel.

Table 1: special touch-tone signal

Table 2: common touch-tone signal

	1209	1336	1477	1633
					697	1	2	3	A
770	4	5	6	B
					852	7	8	9	C
941	*	0	#	D

Shown in Fig. 3, evaluating voice quality testing procedure of the present invention is tested primarily of customization test assignment, initiation, set up tone testing passage transmission digitized voice signal, statistical analysis digitized voice signal, is formed the five steps compositions such as speech quality evaluation report.Five steps operation is independent to be connected each other again.1) test assignment is customized.Mainly undertaken by the mode of artificial interpolation task in mobile service monitoring system, selected different test mode, test number, executive mode and time etc., form test assignment; 2) test is initiated.System initiates test by tandem exchange, according to the route of specifying, automatically according to switch code set synthesis called number, is made a call, and be looped back to business distributed-network monitoring platform by BICC signaling; 3) set up tone testing passage and send digitized voice signal.System enters talking state, sets up tone testing passage simultaneously, two-way transmission digitized voice signal after calling out loopback by BICC; 4) statistical analysis digitized voice signal.According to the digitized voice signal of transmitting-receiving, the situation such as single-pass, cross-talk and voice quality under this route of statistical analysis; 5) speech quality evaluation report is formed.According to the situation that statistical analysis digitized voice signal obtains, gather the result of each test assignment, form report.

A large amount of testings is carried out to the hardware connection structure shown in Fig. 1, and " sending the time " and " time of receipt (T of R) " of record each test digitized voice signal, according to the digitized voice signal of transmitting-receiving, the situation such as single-pass, cross-talk and voice quality under this route of statistical analysis; Be applicable in different loading network, comprise pure TDM carrying, pure IP carries or TDM, IP mix the networks such as carrying; Can carry out traversal test to the whole network network element, for monitoring each network element, whether each node device there is catastrophe failure.

Method of testing of the present invention has following technological merit:

1, special touch-tone signal: revise common touch-tone signal---revise its high-frequency signal part and low frequency signal part is constant, thus realize the outer special number encoding speech signal test function of band, guarantee that this signal is in IP bearer network, transmits in voice channel.

2, the scope of application: be applicable in different loading network, comprises pure TDM carrying, pure IP carries or TDM, IP mix the networks such as carrying.

3, some access: utilize mobile service monitoring system, can accomplish a bit to access all webs' watch, only any point need dispose a probe, and by specific algorithm, can monitor the voice quality between the whole network any two points in net.

4, digitize voice quality fast detecting: by the digitized voice signal of transmitting-receiving, the situation such as single-pass, cross-talk under this route of statistical analysis, and in conjunction with voice document analytical calculation and quantify speech quality PESQ value.

Claims

1., for assessment of a method of testing for voice quality, comprise the following steps:

Test center initiates test by tandem exchange, according to the route of specifying, made a call by BICC signaling, and gain test center, enter talking state, set up voice channel, two-way initiation special number encoding speech signal simultaneously, namely common touch-tone signal high-frequency signal part change and low frequency signal part is constant;

According to the special number encoding speech signal of transmitting-receiving, single-pass, cross-talk and voice quality under statistical analysis route;

The described heart is in testing set up and is gained in test channel, according to specified circuit by network element code set synthesize called number, form calling loopback;

The identifiable design audio digital signals coding adopting special dual-tone multifrequency technology to work out, makes this signal in different loading network, all transmits in voice channel.