KR100367962B1 - Speech quality measurement method and apparatus of trunk in mobile communication system - Google Patents

Abstract

The present invention relates to an apparatus for measuring a trunk line line call quality of a mobile communication system, and an object thereof to automatically perform a call quality measurement of a relay line line according to an objective call quality evaluation standard. An apparatus and method for measuring a line call quality of a relay section of a mobile communication system according to the present invention has an object of automatically measuring the call quality of a relay section line according to an objective call quality evaluation standard. An apparatus for measuring a trunk line line call quality of a mobile communication system according to the present invention for such a purpose may include an outgoing subscriber line port and a called subscriber line port and a user matching means, an exchange matching means, a voice information analyzing means, a result analyzing and statistical processing means. It is made to include. The originating subscriber line port and the called subscriber line port are for matching with a local exchange. The user matching means has a connection information setting mode, a call quality measurement condition setting mode, a call quality measurement mode, and a measurement result output mode for matching with the local exchange. The exchange matching means sends a connection command according to the connection information to the local exchange, and analyzes the message output from the local exchange. When the reference voice signal transmitted through the calling subscriber line is returned through the relay section line and the called subscriber line, the voice information analyzing means compares and digitizes it with the reference voice signal. The result analysis and statistical processing means generate the bad line information and the call quality measurement result through the message and voice information analysis result generated in the local exchange, and then statistically process the result.

Description

Speech quality measurement method and apparatus of trunk in mobile communication system

The present invention relates to an apparatus and method for measuring a call quality of a mobile communication system, and more particularly, to an apparatus and method for measuring a call quality of a trunk line between a switch and a switch.

In recent years, as the proportion of ICT in society, culture, and life has increased greatly, the demand for mobile telecommunication services regardless of time and space is rapidly increasing. To this end, CDMA systems have a much larger capacity than analog systems, and as the number of service users increases exponentially, factors that hinder call quality, such as noise and silence, are increasing. One of the most important customer complaints and at the same time, one of the most important factors for service providers to consider is maintaining clean call quality, which requires efforts to evaluate call quality.

1 shows a network configuration of a general mobile communication system, in which a large number of mobile switching centers (MSCs) 104 are connected to one cellular gateway system (CGS) 102. The structure connecting the relay section line 106 to form a network is shown. Both the cellular gateway system 102 and the mobile service switching center 104 are types of exchanges, and one cellular gateway system 102 may be connected to a trunk line circuit not only with the mobile service switching center 104 but also with other cellular gateway systems. 106) to form a larger network.

One of the many reasons for the deterioration of the call quality of such a mobile communication system is the loss of the call quality in the relay line between the exchange and the exchange. The existing method of measuring the line call quality in the relay section has been made by using a person's repetitive direct call through opening a channel at the local exchange. This method of measuring call quality has a disadvantage in that an objective evaluation cannot be made in that a person needs to make a direct call, and a considerable test time and cost are required due to an unautomated test process.

An apparatus and method for measuring a line call quality of a relay section of a mobile communication system according to the present invention has an object of automatically measuring the call quality of a relay section line according to an objective call quality evaluation standard.

An apparatus for measuring a trunk line line call quality of a mobile communication system according to the present invention for such a purpose may include an outgoing subscriber line port and a called subscriber line port and a user matching means, an exchange matching means, a voice information analyzing means, a result analyzing and statistical processing means. It is made to include. The originating subscriber line port and the called subscriber line port are for matching with a local exchange. The user matching means has a connection information setting mode, a call quality measurement condition setting mode, a call quality measurement mode, and a measurement result output mode for matching with the local exchange. The exchange matching means sends a connection command according to the connection information to the local exchange, and analyzes the message output from the local exchange. When the reference voice signal transmitted through the calling subscriber line is returned through the relay section line and the called subscriber line, the voice information analyzing means compares and digitizes it with the reference voice signal. The result analysis and statistical processing means generate the bad line information and the call quality measurement result through the message and voice information analysis result generated in the local exchange, and then statistically process the result.

In addition, the method for measuring the call duration of a trunk line line in a mobile communication system according to the present invention includes a call setup request step of requesting call setup through a corresponding trunk line line by receiving relay line line information, connection information, and call quality measurement conditions from a user; And when the call is connected, comparing the voice signal returned through the relay line with the reference voice signal by transmitting a test reference voice signal and determining a call quality in the relay line.

1 is a diagram illustrating a network configuration of a general mobile communication system.

Figure 2 is a block diagram showing the measurement interval and the signal transmission path of the call quality measuring apparatus according to the present invention.

Figure 3 is a flow chart showing a measuring method of the call quality measuring apparatus according to the present invention.

Explanation of symbols on the main parts of the drawings

102, 202: local exchange 104, 204: international exchange

106, 210: Repeater line 206: Call quality measuring device

208: Call quality measurement section

A preferred embodiment of an apparatus for measuring a line call quality of a relay section of the mobile communication system according to the present invention will be described with reference to FIGS. 2 to 3 as follows. First, Figure 2 is a block diagram showing the measurement interval and the signal transmission path of the call quality measuring apparatus according to the present invention.

As shown in Fig. 2, the call quality measuring device 206 is directly connected to the local exchange 202 through an outgoing and incoming call line 212. The call quality measuring device 206 performs a user matching function, an exchange matching function, a voice analysis function, and a statistical processing function, among which the exchange matching function is a Man-Machine Command (query, prefix). Commands such as information change request and call setup request) and measurement result analysis functions. In other words, the local exchange 202 requests prefix information change and call setup according to the call quality measurement condition selected by the user. When the call is established, the reference voice signal is transmitted and received, and the stored reference voice signal and the received voice signal are compared with each other to determine the call quality state (good / bad) of the relay section line. After the measurement, the measurement data is analyzed to output specific call quality measurement results.

The local exchange 202 changes the prefix information according to the man-machine command from the call quality measuring device 206, performs routing to the selected route, and traces the number to which the call is set. Provide information. Since this process utilizes the functions already implemented in the existing exchange, there is no added or changed part, and it matches with the call quality measuring device 206 through Telnet.

The power exchange 204 is a target exchange that performs routing in the local exchange 202, and is in charge of rerouting a call setup request through a home location register (HLR) inquiry process. . Like the local exchange 202, the existing function is used as it is without any additional or changed function, and serves to return the call to the local exchange 202 in most cases.

Looking at the configuration and function of the above-mentioned call quality measuring device 206 in more detail. First, referring to the configuration, the call quality measuring apparatus 206 according to the present invention has a form of a computer system equipped with a call quality measuring board. The actual call quality is measured and evaluated on the measurement board, and the measurement results are analyzed, statistics and database are stored on the computer system. In addition, in the computer system, control signals and data signals are communicated between the local exchange 202. Functions performed in the call quality measuring device 206 include a user matching function and an exchange matching function, a security function when performing a command, a result message analysis function, a voice analysis function, a result analysis and statistics function, and the like.

In the user registration function, a graphical user interface is provided for the user to input or select necessary information. It consists of access information request for matching with the local exchange 202 when starting the measurement program, condition setting screen and measurement screen desired by the user, and acquires necessary information from the user, and provides the user with the quality measurement execution status and results. .

The access information screen for the user matching function is an interface for inputting access information for matching with the local exchange 20 after the start of the measurement program. The access information includes the IP address of the local exchange 202, a login ID, a password, and the like.

This section enters information about the calling and terminating subscriber line 212. After call setup, select sound quality measurement standard such as reference voice signal to select when transmitting standard voice signal. Predictive Mean Opinion Score (PMOS) value to be used as a criterion for judging bad / good during testing. Select the test type, such as group route test, individual route test, or individual relay section line test. Input routing information such as prefix and sequence to be used for measurement, that is, information to be changed when selecting a route to be measured.

Select and enter the number of repetitive measurements, the number of remeasurements in case of failure, the measurement method, and the countermeasure in case of failure.

The measurement method selection is to select whether to measure after blocking the selected relay section line when performing the measurement, or to measure when the relay section line is in an idle state.

As a countermeasure in case of a failure, if the measurement finds a bad relay line, stop the program, display a message, stop the program until the user confirms it, generate a beep and continue the program. There is something going on. In addition, if a bad relay line is found, a warning sound is generated, the relay line is blocked, the program continues, and the program is recorded in a database and the program continues.

The exchange matching function is a function of transmitting a corresponding command to the local exchange 202 according to the information input by the user, and analyzing the output message from the local exchange 202. The local exchange 202 using Telnet is used. Form an interface with.

When executing a command, the security function distinguishes between the commands that are available and the commands that cannot be used to prevent wrong commands or messages from affecting the system. It checks whether the command is executed and executes it only when it can be executed. Otherwise, the execution itself is prohibited.

The voice analysis function compares the result detected through the measurement with the reference PMOS value to determine good or bad. The voice analysis function includes a voice information transmission function for transmitting a reference voice signal through an outgoing subscriber line 212a, a voice information reception function for receiving voice over a receiving subscriber line 212b, and a state of received voice to be quantified. Voice information analysis function. The failure state of the relay line which can be known through the voice analysis may include silent sound quality of the relay line and one-way (no-way), noise, and poor voice quality.

The result analysis and statistical processing function analyzes the voice analysis result and the message from the local exchange 202 to transmit the bad line information and the call quality measurement result to the user, and statistically processes the corresponding content to help the analysis. The result analysis and statistical processing function outputs the measurement result for the route and relay section line after the measurement is completed, and statistically processes the measurement result for each exchange, the measurement result for each route, and the measurement result for each relay section. Performs database storage function to make statistics processing function and database the result after statistical processing by exchange, route, and relay line line.

3 is a flowchart illustrating a measuring method of an apparatus for measuring call quality according to the present invention.

When the user selects the relay section line section 210a to test the call quality and the test conditions (number of tests, bad criteria, caller's number, etc.), the call quality measuring device 206 transmits the contents through the telnet line. Notify local exchange 202. At this time, one of the plurality of exchanges connected to the local exchange 202 is selected, and the relay section between the selected exchange and the local exchange 202 becomes the path selected by the user. Measurement is made (S301).

When the call quality measurement target is determined, the local exchange 202 outputs information on the route selected by the user, and changes the routing information of the prefix according to the contents. Further, the call setup request is requested by transmitting a setup relay section line man-machine command (Setup-Trunk MMC) from the calling subscriber line 212a to the called subscriber line 212b (S302).

The power exchange 204 queries the state of the corresponding relay section line before establishing the call (S303). It is determined whether the corresponding relay section line is in use by the subscriber (S304), and if not in use, a call for measuring call quality is established.

The exchange exchange 204, which has been requested to set up the call, performs the calling number query, performs routing to the local switch 202 again through the relay section line section 210b, and then informs the local switch 202 that the call setup is completed. The local exchange 202 transmits a ring signal to the call quality measuring device 206 to hook off the called telephone. Thus, the call is connected through the calling subscriber line 212a, the first relay section line section 210a, the second relay section line section 210b, and the called subscriber line 212b (S305).

When the setup relay section line man-machine command is transmitted, the local exchange 202 transmits a ring back tone to the call quality measuring apparatus 206 so that the user hooks off the calling party (S306). ). When the calling telephone is hooked off, the local exchange 202 requests the call exchange 204 to establish a call (S307 to S308).

When the call is connected, the call quality measuring device 206 transmits a test reference voice signal stored in advance through the calling subscriber line 212a. The reference voice signal passes through the first relay section 210a, the power exchange 204, and the second relay section 210b, and then returns to the call quality measuring device 206 through the called subscriber line 212b ( S309).

The call quality measuring apparatus 206 compares and analyzes the transmitted reference voice signal and the received voice signal to determine the call quality in the corresponding relay section line, and then outputs the result and stores the result in a database (S310).

Upon completion of the measurement of the call quality, the local exchange 202 requests the call exchange 204 for a call release. The power exchange 204 releases the call setup and informs the local exchange 202 of this. The call quality measuring apparatus 206 repeats the steps S306 to S310 described above with respect to another relay section line which has not performed call quality measurement (S311), and when the measurement of the call quality is completed for all the relay section lines. The operation ends (S312).

Apparatus and method for measuring line segment call quality of a mobile communication system according to the present invention can automatically measure call quality of a line segment according to an objective call quality evaluation standard, thereby measuring call quality at an actual voice quality level. Provide the effect.

Claims (4)

In the relay section line call quality measurement device of a mobile communication system, each of which at least one local exchange and the exchange switch is interconnected by a relay section line, An originating subscriber line port and a called subscriber line port for matching with the local exchange; User matching means having a connection information setting mode, a call quality measurement condition setting mode, a call quality measurement mode, and a measurement result output mode for matching with the local exchange; Exchange matching means for transmitting a connection command according to the connection information to the local exchange, and analyzing a message output from the local exchange; Voice information analyzing means for comparing and quantifying the reference voice signal when the reference voice signal transmitted through the calling subscriber line is returned through the relay section line and the called subscriber line; Relay section line of a mobile communication system including a result analysis and statistical processing means for generating and processing statistically bad channel information and call quality measurement result through the message and voice information analysis result generated in the local exchange. Call quality measuring device. The apparatus of claim 1, wherein the relay line call quality measuring device is connected to the local area network through a telnet. In the method of measuring the call quality of a trunk line circuit in a mobile communication system in which a plurality of local exchanges and a large-sized exchange are interconnected by a trunk line circuit, A call establishment request step of receiving the relay line information, access information, and call quality measurement condition from a user and requesting call establishment through a corresponding relay section line; And transmitting a test reference voice signal when the call is connected, and then comparing and analyzing the voice signal returned through the relay section line with the reference voice signal to determine the call quality on the relay section line. Method for measuring line call quality in relay section of communication system. The method of claim 3, wherein the call establishment request step, Requesting call establishment from the local exchange by receiving the relay section line information, the access information, and the call quality measurement condition from a user; Causing the local exchange to request to set up a call to send a ring signal to the user to hook off the user's outgoing call; Querying a state of the relay section line and setting up a call through the relay section line if not in use; And transmitting a ring signal to the user after the call is set up so as to hook off the incoming call of the user.