KR100364330B1 - Mobile voice quality test system and testing method thereof - Google Patents

Abstract

According to the present invention, a voice quality measurement apparatus is mounted inside a mobile switch center (MSC) in a mobile communication exchange system to facilitate testing of the entire path to be measured according to the support of the exchange software. It relates to a measuring device and a measuring method.

To this end, the present invention provides an apparatus for measuring voice quality of a mobile communication system including a mobile communication controller, a base station controller, a base station, and a test mobile phone. A general-purpose asynchronous transceiver for transmitting and receiving through a 232 interface; When the power is supplied, the program is executed by receiving the execution program code from the flash memory, and the voice sample is read from the SDRAM during tone and voice quality measurement. After PCM A-law encoding, PCM sample data is transmitted through the first programmable logic device (EPLD) and the data bus. A digital signal processor configured to control transmission and reception of the digital signal, and to store the received voice sample in the SDRAM after A-law decoding; After receiving the A-law PCM sample data from the digital signal processor through a data bus and performing parallel-to-serial conversion, the A-law PCM sample data is transferred to a PCM sub highway via a first transmit / receive chip supporting RS485 through the serial slot, and the PCM sub highway A first programmable logic device that receives a PCM sample from a slot selected from and passes the serial-to-parallel conversion to a digital signal processor via a data bus; A DP-RAM having a dual port for communicating between the processor PP in the exchange and the voice quality measuring device; A SDRAM for storing various tables required for calculating PCM sample data, a voice original sound, and a voice quality test value (PMOS) received for each channel, and a flash memory for storing a boot coded voice original sound for booting the digital signal processor; A second programmable logic device that performs standard TD-BUS matching in matching between the voice quality measurement device and the processor (PP) in the exchange, and is a logic for register and TD-BUS matching to be provided in the TD-BUS standard; Voice quality measuring device transmits and receives a test PCM sample to the PCM subhighway, or the first and second consisting of LTC487, LTC489 chips which are RS485 standard transceiver chips required for TD-BUS communication with the processor (PP) in the exchange. A voice quality measuring device including a transmission / reception chip is installed in the mobile communication controller and built-in type, and the test speed is measured by independently measuring the number of test channels per board at the same time. It can be improved more than four times compared to 45782. In addition, by measuring the tone strength and frequency deviation test using three tones (404Hz, 1004Hz, 2804Hz), it is possible to diagnose the quality of the mobile network, select the PCM channel for the test, and upload the voice from the voice received from the PMOS test. And TD-BUS provides the effect of easy F / W download.

Description

Apparatus and method for measuring voice quality of mobile communication system

The present invention relates to a voice quality measuring apparatus and a measuring method of a mobile communication system. In particular, the voice quality measuring apparatus is mounted in a mobile switch center (MSC) in a mobile communication switching system and measured according to the support of the switching software. The present invention relates to a voice quality measuring apparatus and a measuring method of a mobile communication system for facilitating a test of an entire path.

In recent years, in response to the rapid development of technology in the field of information and communication, the demand for mobile communication services regardless of time and place is rapidly increasing.

Such a mobile communication system uses a code division multiple access (CDMA) system, which has a much larger capacity than an analog system. As the number of service users increases rapidly, there are cases where the call quality such as noise and silence during the call is impaired. It is happening frequently.

One of the most important customer complaints, but one of the most important considerations for service providers, is maintaining clean call quality, which requires thorough and accurate call quality testing.

There are a number of factors that degrade the call quality, but it is directly affected by the vocoder (Vocoder) in the base station controller (BSC) of the exchange.

In the related art, a method of measuring vocoder call quality has been a method of using a person's repetitive direct call through opening a call path in a base station controller (BSC).

However, such a call quality measurement method has a problem that it is difficult to make an objective evaluation because a person must make a direct call and evaluate, and test time and cost are high due to an unautomated test process.

Patent application No. 2000-45782 proposed by the present applicant to solve the above problems is to automatically perform the vocoder call quality measurement in accordance with the objective call quality evaluation criteria, but the call quality measuring apparatus is a base station controller ( Since it is a so-called external type installed outside of BSC), it is impossible to test the entire path to be measured under the support of the exchange software, and the test channel is limited to one channel. .

Accordingly, the present invention has been proposed to solve the above-mentioned problems of the prior art, and is provided with a so-called built-in replacement software for mounting a voice quality measuring device mounted inside a mobile communication center (MSC) in a mobile communication switching system. It is easy to test the entire path to be measured with the support of the tester, and the test speed can be improved by more than four times compared to the previously applied patent application No. 2000-45782 by measuring the number of test channels per board independently at the same time. For that purpose.

An apparatus for measuring voice quality of a mobile communication system according to the present invention for achieving the above object is a device for measuring the voice quality of a mobile communication system including a mobile communication controller, a base station controller, a base station and a test mobile phone. A general-purpose asynchronous transceiver for transmitting and receiving via a PC and an RS-232 interface; When the power is supplied, the program is executed by receiving the execution program code from the flash memory, and the voice sample is read from the SDRAM during tone and voice quality measurement. After PCM A-law encoding, PCM sample data is transmitted through the first programmable logic device (EPLD) and the data bus. A digital signal processor configured to control transmission and reception of the digital signal, and to store the received voice sample in the SDRAM after A-law decoding; After receiving the A-law PCM sample data from the digital signal processor through a data bus and performing parallel-to-serial conversion, the A-law PCM sample data is transferred to a PCM sub highway via a first transmit / receive chip supporting RS485 through the serial slot, and the PCM sub highway A first programmable logic device that receives a PCM sample from a slot selected from and passes the serial-to-parallel conversion to a digital signal processor via a data bus; A DP-RAM having a dual port for communicating between the processor PP in the exchange and the voice quality measuring device; An SDRAM for storing various tables necessary for calculating PCM sample data, a voice original sound, and a voice quality test value (PMOS) received for each channel, and a flash memory for storing a boot coded voice original sound for booting the digital signal processor; A second programmable logic device that performs standard TD-BUS matching in matching between the voice quality measurement device and the processor (PP) in the exchange, and is a logic for register and TD-BUS matching to be provided in the TD-BUS standard; Voice quality measuring apparatus transmits and receives a test PCM sample to the PCM subhighway, or the first and second consisting of LTC487, LTC489 chips which are RS485 standard transmission and reception chips required for TD-BUS communication with the processor (PP) in the exchange. It is characterized in that the voice quality measurement device including a transmission and reception chip installed in the mobile communication controller built in a built-in type.

In addition, the voice quality measurement method of the mobile communication system to achieve the above object is a first step of checking the presence or absence of a command to be executed from the processor (PP) in the exchange by checking the reception master flag of the DPRAM in the initial state of the system, If there is a command to be performed, analyzing a received command to determine which command and sequentially performing a routine according to the command; and analyzing the received command to test a voice source sound and a voice quality A third step of calculating a MOS value by performing a voice quality measurement algorithm (SKQM), and a time to calculate the voice source sound and a voice quality test (PMOS) value, when the PMOS value is calculated. If not, check the time to calculate the tone quality, and when it is time to calculate the tone quality, perform the tone algorithm to determine the tone intensity and frequency. A fourth step of calculating the deviation, and if there is data to be transmitted to the processor (PP) in the exchange if it is not time to calculate the tone quality, storing the result at the corresponding address of the DPRAM and setting the transmission master flag. A fifth step of checking whether there is a voice upload to be delivered to the processor PP in the exchange, and if so, storing a voice sample at a corresponding address of the DPRAM and setting a transmission master flag; And a seventh step of returning to the first step if there is no voice upload to be delivered to the processor PP in the exchange.

In addition, performing a routine according to the corresponding command in the second step includes reading plan set information received from the DPRAM when the received command is a plan set and setting a test type, a test number, a test PCM slot, and the like. .

In addition, performing the routine according to the corresponding command in the second step includes starting a test according to the plan set information when the received command is a test start.

In addition, the execution of the routine according to the corresponding command in the second step includes stopping the current test if the received command is a test stop.

In addition, performing the routine according to the corresponding command in the second step includes performing a self test by forming a loop in the voice quality measuring apparatus when the received command is a self-loop test.

In addition, performing the routine according to the corresponding command in the second step includes diagnosing its own board and transmitting the diagnosis result to the processor PP in the exchange when the received command is a diagnostic test.

In addition, in the second step, the execution of the routine according to the corresponding instruction is to download a new F / W code from the processor (PP) in the exchange and upgrade to a new code when the received instruction is firmware (F / W) downloading. Steps.

1 is a block diagram of a mobile communication system according to the present invention;

2 is a block diagram of an apparatus for measuring voice quality of a mobile communication system according to the present invention;

3 is a flowchart illustrating a method for measuring voice quality of a mobile communication system according to the present invention;

* Description of the symbols for the main parts of the drawings *

10: Mobile communication controller (MSC) 11: Voice quality measuring device (MVQTA)

20: base station controller (BSC) 23: vocoder control processor (TCP)

30: base station (BTS) 40: test mobile phone (TM)

110: general purpose asynchronous transmitter and receiver (UART) 113: digital signal processor (DSP)

114,118: First and second programmable logic devices (EPLD)

117: DP-RAM 121: SDRAM

122: flash memory

Hereinafter, the present invention will be described with reference to FIGS. 1 to 3.

1 is a block diagram of a mobile communication system according to the present invention, which is intended to describe the call test path according to the present invention in more detail.

First, the switch switch structure of the mobile communication controller 10 is a simple T (T_SW)-S (S_SW)-T (T_SW, as shown by the sign 12, 13, 14 to handle a large amount of traffic (traffic) ) Is designed. In this case, a loop is applied to the T_SW side of the rear end of the T-S-T switch, and a voice sample is transmitted and received to measure the abnormality of the T-S-T switch. In this path, if the switch works properly, the voice samples cannot be distorted, so the voice quality test (MOS) value should be 5, and if it is not 5, there is a problem with the switch.

Next, the base station controller 20 matches a plurality of base stations 30 to perform functions such as cell-to-cell handoff processing, call control, operation and maintenance control of the base station, and a vocoder is embedded therein. have.

The test here forms a loop in the T_SW 21 at the front end before passing through the vocoder, so that the TST switch of the mobile communication controller 10, the relay section between the mobile communication controller 10 and the base station controller 20, and the base station controller 20 The abnormality of the path (②) to the front end T_SW21 of () is measured.

In this path, if the switch works properly, the voice sample cannot be distorted, so the MOS value should be 5. If the value is not 5, there is a problem with the switch or the relay section.

The base station controller 20 is equipped with a plurality of vocoder cards and one card also includes a plurality of vocoder.

In this example, a loop is formed at the encoder 22 output terminal and the decoder 24 input terminal of the selected vocoder to send and receive a voice or tone sample through the set path ③, and measure the voice and tone quality. At this time, the voice is distorted when passing through the vocoder, so the voice quality test (MOS) value is evaluated according to the performance of the vocoder.

On the other hand, the area that the power of the base station 30 is called a cell (cell), the base station 30 provides a mobile communication service to the subscriber by wirelessly communicating with the MS in the cell.

To this end, the base station 30 transmits and receives a radio signal with the MS by encoding and decoding the radio channel. In addition, in order to provide a better quality wireless call, the transmission and reception signal strength control, uplink quality measurement, spatial diversity function, radio resource management and self-maintenance function are performed.

The communication between the base station controller 20 and the base station 30 uses an asynchronous transmission (ATM) scheme, which adds an addressed overhead bit to each message to efficiently use a limited link.

In this case, loops are made on the assigned channel elements to send and receive voice or tone samples along the established path and measure voice and tone quality.

By testing this path (4), it is possible to determine whether there is an abnormality in ATM communication and channel elements.

The test mobile phone 40 is controllable in the system and is a wireless section between the test mobile phone 40 and the base station 30.

In this case, a test mobile phone 40 forms a loop to send a voice or tone sample in a set path and measure voice and tone quality.

By testing this path (5), the quality of the radio link can be measured.

As shown in FIG. 1, the apparatus 11 for measuring voice quality according to the present invention is constructed in the mobile communication controller 10. As shown in FIG.

Figure 2 shows a detailed block diagram of this, as shown, a general-purpose asynchronous receiver 110 for transmitting and receiving through the PC (PC) and the RS-232 interface unit 111; When the power is applied, the program is executed by receiving the execution program code from the flash memory 122, and when the tone and voice quality is measured, the voice sample is read from the SDRAM 121 and the first programmable logic device (EPLD) 114 after PCM A-law encoding is encoded. A digital signal processor 113 for controlling transmission and reception of PCM sample data through a data bus and storing the received voice sample in the SDRAM 121 after A-law decoding; After receiving the A-law PCM sample data from the digital signal processor 113 through the data bus and performing parallel-to-serial conversion, the A-law PCM sample data is loaded into a set slot and then passed through a first transmit / receive chip 115 supporting RS485. To the PCM sub highway 116, receive PCM samples from the selected slot from the PCM sub highway 116, undergo serial-to-parallel conversion, and then to the digital signal processor 113 via the data bus. A first programmable logic device 114 for communicating; A DP-RAM 117 having dual ports for communicating between the processor PP in the exchange and the voice quality measuring apparatus; SDRAM 121 for storing various tables necessary for calculating PCM sample data, audio original sound and voice quality test value (PMOS) received for each channel, and boot coded audio original sound for booting the digital signal processor 113. A flash memory 122; A second programmable logic device 118 that executes a standard TD-BUS match in matching between the voice quality measurement device and a processor (PP) in the exchange, and is a logic for register and TD-BUS matching to be provided in the TD-BUS standard. )Wow; A voice PCM sample transmits and receives a test PCM sample to the PCM subhighway 116, or a LTC487 and LTC489 chip, which is a RS485 standard transmission / reception chip required for TD-BUS communication with a processor (PP) in the exchange. And a second transmit / receive chip 115 and 120.

Referring to the operation of the speech quality measuring apparatus according to the present invention configured as described above are as follows.

First, the digital signal processor 113 receives an execution program code from a flash memory 122 when a power is applied to a system, executes a program, and initializes operations of peripheral hardware. In addition, during tone and voice quality measurement, the digital signal processor 113 reads a voice sample from the SDRAM 121 and transmits the PCM A-law to the first programmable logic device (EPLD) 114 after encoding it. The logic device 114 transmits through the selected slot of the 32 PCM slots provided in the PCM sub highway 116 via the RS485 (115).

In this case, the first programmable logic device 114 receives the A-law PCM sample of the selected slot from the PCM highway 116 and transmits the received A-law PCM sample to the digital signal processor 113, and the digital signal processor 113 transmits the received voice sample. After A-law decoding, it is stored in the SDRAM 121.

When the voice and tone samples are stored as long as the sample length, the sample is read from the SDRAM 121 and the voice original sound and voice quality test value (PMOS) and the tone measurement value are calculated.

At this time, the processor PP in the exchange communicates with the DP-RAM 117, and the processor 117 in the exchange transmits the command data through the TD-BUS 119 when there is a command to be transmitted to the voice quality measuring apparatus. .

The second programmable logic device 118 decodes it and stores the instruction in the area of the DP-RAM 117. If the voice quality measuring apparatus has a result value to transmit to the processor PP in the exchange, the allocated DP-RAM 121 is allocated. Data is stored in the Tx-BUS 119 via the TD-BUS 119.

The voice quality measuring device receives the command line or transmits the result through the RS-232C serial port for debugging. When the PC sends a command through the serial port, the RS232 interface unit 111 and the asynchronous transceiver 110 are transmitted. ) Is transmitted to the digital signal processor 113, and accordingly, the digital signal processor 111 transmits the result value to the PC through the asynchronous transceiver 110 and the RS232 interface 111.

Meanwhile, the first programmable logic device 114 receives the 8-bit A-law PCM sample data, passes it through a parallel-to-serial conversion process, and transfers the same to the PCM sub highway 116. PCM samples are received from the selected slots from the PCM sub highway 116 and passed through the data bus to the digital signal processor 113 after serial-to-parallel conversion.

The second programmable logic device 118 is mounted on the voice quality measuring device and performs the register and TD-BUS matching to be provided in the standard TD-BUS 119 upon matching between the voice quality measuring device and the processor (PP) in the exchange. do.

The DP-RAM 117 has a size of 2K × 16 and is used for communication between the processor PP and the voice quality measurement apparatus in the exchange.

The SDRAM 121 stores PCM samples received for each channel, and also stores various tables necessary for calculating the audio original sound and the PMOS value.

The flash memory 122 stores a boot coded voice original sound for booting the digital signal processor 113.

The first transmission / reception chip 115 and the second transmission / reception chip 120 are transmission / reception chips that support the RS485 standard, and transmit / receive a test PCM sample from the voice quality measurement device to the PCM subhighway 116 in the voice quality measurement device. It consists of LTC487 and LTC489 chips, which are RS485 standard transmission / reception chips required for communication between the processor PP and the TD-BUS 119 in the exchange.

Debug port 112 is a port provided for diagnosing a voice quality measuring device in the PC (PC) is connected to the PC (PC) and the RS-232C cable.

The PCM sub highway 116 is interfaced with a voice quality measurement device to transmit and receive PCM voice samples.

In other words, the voice quality measuring device is connected to the cable of the PCM sub highway 116, through which a maximum of four slots per voice quality measuring device board can be selected from 0 to 31 PCM slots to test the A-law PCM voice. Send and receive samples. In this case, the PCMs loaded in the slots to be tested are received by the voice quality measuring apparatus board and four channels are independently processed by multitasking in the digital signal processor 113. Therefore, the test speed is improved by four times or more compared to the external type (Patent Application No. 2000-45782) previously filed by the applicant.

The TD-BUS 119 is a Telephony Device Control Bus. The voice quality measurement device is interfaced with the processor (PP) in the exchange with the TD-BUS, and the TD-BUS is composed of the RS-485 standard. do.

3 is a flowchart illustrating a method for measuring voice quality of a mobile communication system according to the present invention. As shown in FIG. A first step of checking whether there is a command to be executed from the second step, and a second step of checking which command is received by analyzing the received command if there is the command to be executed and sequentially performing a routine according to the command, and the received command If the time is to determine whether to calculate the voice source and voice quality test (PMOS) value if the corresponding command is not analyzed, and performing the voice quality measurement algorithm (SKQM) to calculate the MOS value, and the voice When calculating tone quality, check when to calculate the tone quality, unless it is time to calculate the original sound and voice quality test (PMOS) values. The fourth step of calculating the tone intensity and frequency deviation by performing the tone algorithm and checking whether there is any data to be transmitted to the processor (PP) in the exchange when the tone sound quality is not calculated. A fifth step of storing the resultant value and setting a transmission master flag, and checking whether there is a voice upload to be delivered to the processor (PP) in the exchange, and if there is a voice at the corresponding address of the DP-RAM, A sixth step of storing a sample and setting a transmission master flag, and a seventh step of returning to the first step if there is no voice upload to be delivered to the processor PP in the exchange.

In addition, in the second step, the execution of the routine according to the corresponding instruction reads the plan set information received from the DP-RAM when the received instruction is a plan set, and then checks the test type, the number of tests, and the test PCM slot. This includes the step of setting.

In addition, performing the routine according to the corresponding command in the second step includes starting a test according to the plan set information when the received command is TEST START.

In addition, the execution of the routine according to the corresponding command in the second step includes stopping the current test if the received command is a test stop.

In addition, performing the routine according to the corresponding command in the second step includes performing a self test by forming a loop in the voice quality measuring apparatus when the received command is a self loop test.

In addition, performing the routine according to the corresponding command in the second step includes diagnosing its own board and transmitting the diagnosis result to the processor PP in the exchange when the received command is a DIAGNOSTIC test. will be.

In the second step, the routine execution according to the corresponding instruction is performed by downloading a new F / W code from the processor PP in the exchange when the received instruction is F / W DOWNLOAD. This includes upgrading to.

When the voice quality measurement method of the mobile communication system according to the present invention made as described above in more detail.

First, the reception master flag of the DP-RAM 117 is checked while the hardware and software of the voice quality measuring apparatus are initialized to check whether there is a command to be executed from the processor PP in the exchange (S1).

As a result of the check, if there is a received instruction, the processor (PP) in the exchange analyzes the received instruction to determine which instruction and performs a routine according to the instruction (S2).

Here, the step of sequentially performing the routine according to the instruction will be described later.

If there is no command received as a result of the check, when it is time to calculate (S3) whether to calculate the voice source sound and the PMOS value, the voice quality test algorithm (SKQM) is performed to perform the voice quality test (MOS) value. Calculate (S4).

In this case, the voice quality test (MOS) value is a method of arbitrarily speaking the distorted voice, and is evaluated according to CCITT Res 56-2.

In this case, the voice quality measurement algorithm (SKQM) simultaneously supports four channels, calculates the distortion degree of the received voice sample, and maps it between 1 to 5 points.

In the step S3, if it is time to calculate the tone quality or the voice quality test (PMOS) value or not, it is time to calculate the tone quality (S5). In the case of a test, the tone strength and the frequency deviation are calculated if the number of received tone samples is greater than the required number (S6).

If it is not time to calculate the tone quality in step S5, check whether there is data to be transmitted to the processor (PP) in the exchange (S7), and if there is data to be transmitted to the PP, the result value is written to the corresponding address of the DP-RAM 117. Save and set the transmit master flag to have the PP take it (S8).

In step S7, if there is no data to be transmitted to the PP, it is checked whether there is a voice upload (UPLOAD) to be transmitted to the PP (S9). If there is, the voice sample is stored at a corresponding address of the DP-RAM 117, and a transmission master flag Set to take the PP (S10).

If there is no voice upload in step S9, the process returns to step S1.

Next, a step of sequentially executing the routine according to the above-described instruction will be described in detail.

Analyzes the command received from the PP (S2), checks whether the received command is a plan set (S11), and if it is a plan set, reads the plan set information received from the DP-RAM 117 (MOS TEST, 404 Hz, 1004 Hz). , 2804 Hz) and the number of tests, test PCM slots, etc. are set (S12).

The reason why the tone intensity and frequency deviation test is divided into three tones of 404Hz, 1004Hz, and 2804Hz is that the frequency components of the voice are mostly in the 300 to 3400Hz band, which is difficult to test for all components in the voice quality measuring device. Three tones are used to test the components of the band.

As shown above, this test is to measure the tone strength and frequency deviation of looped back by sending three types of 404Hz, 1004Hz, and 2804Hz, and it is possible to selectively use three types of output tone such as 0dBm, -5dBm, -10dBm. have. That is, the power of the distorted tone is calculated and expressed in dBm unit. The frequency deviation of the distorted tone is calculated by using a Goezel algorithm that determines whether a desired tone frequency component exists.

In step S11, if the received instruction is not a plan set, it is checked whether the test is started (S13), and if the test is started, the test is started according to the plan set information (S14).

If it is not the test start, check whether the test is stopped (S15) and if the test is stopped, the current test is stopped (S16).

Subsequently, if it is not the test interruption, it is checked whether the received command is a self-loop test (S17). If the self-loop test is performed, a loop is formed in the voice quality measuring apparatus to perform a self test (S18).

If it is not the self-loop test, it is checked whether it is a diagnostic test (S19), and if it is a diagnostic test, the self board is diagnosed and the diagnostic result is transmitted to the processor (PP) in the exchange (S20).

If it is not a diagnostic test, check whether the firmware (F / W) is downloaded (S21), and if it is F / W download, download a new F / W code from the processor (PP) in the exchange and upgrade to a new code (S22). If the command is not an F / W download, the process returns to step S3.

As described above, the present invention installs a voice quality measurement apparatus in a so-called embedded type mounted inside a mobile switch center (MSC) in a mobile communication switching system, and tests the entire path to be measured in accordance with the support of the exchange software. In addition, the test speed can be improved by more than four times as compared to the previously filed patent application No. 2000-45782 by measuring the number of test channels per board independently at the same time. In addition, by measuring the tone strength and frequency deviation test using three tones (404Hz, 1004Hz, 2804Hz), it is possible to diagnose the quality of the mobile network, select the PCM channel for the test, and upload the voice from the voice received from the PMOS test. And TD-BUS provides the effect of easy F / W download.

Claims (12)

An apparatus for measuring voice quality of a mobile communication system is a device for measuring voice quality of a mobile communication system including a mobile communication controller, a base station controller, a base station, and a test mobile phone. A general-purpose asynchronous transceiver for transmitting and receiving via a PC and an RS-232 interface; Receive program code from flash memory at power-up to execute programs, read and encode voice samples from SDRAM during tone and voice quality measurements, and send and receive PCM sample data through the first programmable logic device (EPLD) and data bus A digital signal processor for controlling and decoding the received voice sample and storing the received voice sample in the SDRAM; After receiving the sample data from the digital signal processor through a data bus and performing parallel-to-serial conversion, the sample data is transferred to a PCM sub highway via a first transmit / receive chip supporting RS485 through a serial-slot conversion from a slot selected from the PCM sub highway. A first programmable logic device that receives the PCM sample and passes it through a serial-to-parallel conversion to a digital signal processor via a data bus; A DP-RAM having a dual port for communicating between the processor PP in the exchange and the voice quality measuring device; SDRAM for storing various tables necessary for calculating PCM sample data, original sound and voice quality test value (PMOS) received for each channel; A flash memory for storing a boot coded speech original sound for booting the digital signal processor; A second programmable logic device that performs standard TD-BUS matching in matching between the voice quality measurement device and the processor (PP) in the exchange, and is a logic for register and TD-BUS matching to be provided in the TD-BUS standard; Voice quality measuring apparatus transmits and receives a test PCM sample to the PCM subhighway, or the first and second consisting of LTC487, LTC489 chips which are RS485 standard transmission and reception chips required for TD-BUS communication with the processor (PP) in the exchange. An apparatus for measuring a speech quality of a mobile communication system, comprising: a speech quality measuring apparatus including a transmission / reception chip installed inside the mobile communication controller. The method of claim 1, The voice sample from the digital signal processor is A-law PCM, the voice quality measuring apparatus of the mobile communication system. The method of claim 1, The digital signal processor is an audio quality measurement apparatus of a mobile communication system, characterized in that to independently process four test channels by multitasking (Multitasking). In the method for measuring the voice quality of a mobile communication system, A first step of checking whether a command to be executed from a processor (PP) in the exchange is checked by checking a reception master flag of the DP-RAM in the initial state of the system; A second step of identifying a command by analyzing the received command if there is a command to be performed and sequentially performing a routine according to the command; A third step of calculating a MOS value by performing a speech quality measurement algorithm (SKQM) when analyzing the received command to determine whether it is time to calculate a voice source sound and a PMOS value if it is not the command; Wow, A fourth step of calculating a tone intensity and a frequency deviation by performing a tone algorithm when the tone quality is calculated by checking a timing when tone quality is calculated, when it is not time to calculate the voice source sound and PMOS value; A fifth step of storing a result value at a corresponding address of the DP-RAM and setting a transmission master flag if it is determined whether there is data to be transmitted to the processor (PP) in the exchange when it is not time to calculate the tone sound quality; A sixth step of checking whether or not a voice upload to be delivered to the processor PP in the exchange exists and storing the voice sample at a corresponding address of the DP-RAM and setting a transmission master flag; And a seventh step of returning to the first step if there is no voice upload to be delivered to the processor (PP) in the switch. The method of claim 4, wherein In the second step, when the received command is a plan set, reading the plan set information received from the DP-RAM and setting a test type, a test number, a test PCM slot, and the like, and measuring voice quality of the mobile communication system Way. The method of claim 5, The test type is divided into three types of tone 404Hz, 1004Hz, 2804Hz tone quality measurement method of a mobile communication system. The method of claim 4, wherein And starting a test according to plan set information when the received command is a test start in the second step. The method of claim 4, wherein And stopping the current test if the received command is a test interruption in the second step. The method of claim 4, wherein And performing a self test by forming a loop in the voice quality measuring apparatus when the received command is a self-loop test in the second step. The method of claim 4, wherein And diagnosing its own board and transmitting a diagnosis result to a processor (PP) in the switch when the received command is a diagnostic test in the second step. The method of claim 4, wherein In the second step, when the command is firmware (F / W) downloading, the voice quality measurement of the mobile communication system including downloading a new F / W code from the processor (PP) in the exchange and upgrading to a new code. Way. The method of claim 4, wherein In the third step, the voice quality measurement algorithm (SKQM) simultaneously supports four channels, and calculates the distortion degree of the received voice sample and maps it between 1 to 5 points. Voice quality measurement method.