JP2000022780A - Speech line test device and speech line test method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To specify a fault point of a speech line for digital mobile communication to which a high efficiency code CODEC is inserted. SOLUTION: A test section 1 stores a μ-law voice data and high efficiency code data as test data. In addition to a 1st loop back point that loops back the test data as they are at a remote end of a speech line, a 2nd loop back point and a 3rd loop back point are provided in a high efficiency code CODEC 4. The μ-law voice data are inputted to a coding section 5 at the 2nd loop back point to loop back converted high efficiency code data directly to an incoming highway 8. Furthermore, the high efficiency code data are inputted to a decoding section 6 at the 3rd loop back point. As a result, the decoded μ-law voice data are sent to the incoming highway 8. Which test data are in use and at which loopback point the data are looped back are instructed by a control section 3 to the test section 1, a time division switch 2 and the high efficiency code CODEC 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a channel test apparatus and a channel test method in a digital mobile communication switching system.

[0002]

2. Description of the Related Art As a conventional communication path test apparatus of this kind,
For example, a communication line test circuit described in JP-A-5-110632 is known. FIG. 4 shows FIG.
2 and reprinted with some reference numbers changed.

[0003] The system shown in FIG. 4 includes a high-efficiency CODEC 24 capable of encoding and decoding low-bit-rate high-efficiency data on a digital communication line 21.
A communication path 22 capable of connecting each line in a time slot unit,
This is a digital mobile communication system including a radio base station 23 communicating with a mobile device 27 and a test circuit 28 provided at an end of a communication path 22.

The test circuit 28 includes a test pattern storage section 81 capable of storing a digital audio signal as test data, a transmission circuit 82 capable of transmitting data to the communication path 22, and data from the communication path 22. Sending data is instructed to a receiving circuit 83 capable of receiving, a received signal accumulating section 84 capable of accumulating received received data, and a test pattern storing section 81, and also calculates received data and test data. And a control circuit 85 for evaluating the state of the line.

[0005] In a test pattern storage section 81, test data constituted by a bit pattern is stored, and in accordance with an instruction from a control circuit section 85, the test data is transmitted from a transmission circuit 82 to the digital communication line 21. The transmitted test data is connected to the communication line to be tested by the communication path 22 and received by the high-efficiency CODEC device 24, and the received test data is once converted into a high-efficiency code in the high-efficiency CODEC 24 and returned. The signal is looped back at the point, and is again decoded from the high-efficiency code into a μ-law digital voice by the high-efficiency CODEC 24.

The decoded μ-law audio data is received by the receiving circuit unit 83 of the test circuit 28 via the communication path 22 and is stored in the received signal storing unit 84. Control circuit 85
Calculates an S / N ratio, which is a noise ratio, based on the signal strength of the received data stored in the received signal storage unit 84 and the signal strength of the transmitted test pattern. Then, the quality of the digital communication line 21 is determined by comparing the calculated S / N ratio with a threshold value according to the state up to the turning point.

[0007]

In the above-described conventional communication line test circuit, the test pattern sent from the test circuit 28 is once encoded by the encoding circuit of the high efficiency CODEC 24, and the converted high efficiency code data is looped back. At the point, and this is further decoded by a decoding circuit and μ-law
Since the digital audio signal is decoded into a digital audio signal and returned to the test circuit 28, it is not possible to specify the point of the error, whether the error has occurred in the downstream encoding circuit or the error in the upstream decoding circuit. There is.

An object of the present invention is to provide a channel test apparatus and a channel test method for improving maintainability of a digital mobile communication channel into which a high-efficiency code CODEC is inserted by specifying a failure point of the channel. To provide.

[0009]

SUMMARY OF THE INVENTION A channel test apparatus according to the present invention is an apparatus for testing a channel in a digital mobile communication switching system.
A plurality of return points provided in the DEC, a plurality of test data can be transmitted to the communication path, and a test section for testing the communication path by comparing with test data returned from the return point; Code COD
An EC and a control unit for instructing the test unit to specify a test type and selecting the return point and test data.

According to a preferred embodiment of the present invention, the test data is μ-law audio data and high-efficiency code data, and at the first turning point, the μ-law audio data is used. Wraps the high-efficiency code data converted by the encoding unit, and at the second turning point, converts the high-efficiency code data to μ-l
aw audio data is input to a decoding unit.

In a preferred embodiment of the present invention, the test section includes a test data buffer section storing the test data in advance, and a transmitting section transmitting the test data to the call path. A receiving unit for receiving the returned test data, a receiving buffer for storing the received test data, the test data buffer, the receiving buffer, the transmitting unit, and the receiving unit. A highway interface unit for drawing a test time slot from the communication path and inserting the test data into the test time slot; selecting the test data according to an instruction from the control unit; controlling the highway interface unit And a calculation unit for comparing the test data, and the highway interface unit And a selector provided on each of the way and the down highway for temporarily holding the test data, and a selector which normally selects a silent signal but selects the register under the control of the arithmetic unit. The test data buffer unit is characterized by comprising a read-only memory.

[0012] The present invention also provides a method for testing a channel in a switching system for digital mobile communication, comprising the steps of: providing a plurality of return points in a high-efficiency code CODEC inserted into the channel. A procedure for storing a plurality of types of test data, a procedure for specifying each of the return point and the test data, and a step of transmitting the specified test data to the communication path and returning at the specified return point. And comparing the received test data with the test data.

According to a preferred embodiment of the present invention, in the communication channel test method, the test data is μ-law audio data and high-efficiency code data, and at the first turning point, the μ-law audio data is used. Wraps the high-efficiency code data converted by the encoding unit, and at the second turning point, converts the high-efficiency code data to μ-l
aw audio data is input to a decoding unit.

In short, according to the present invention, μ-law audio data and high-efficiency code data of a low bit rate corresponding to the μ-law audio data are stored in advance, and the test data from the test apparatus is transmitted by a control signal of a test execution instruction / test type instruction. Is selected, and by setting a plurality of loopback points of the test channel, a detailed test of the channel is performed by judging the normality of the upstream and downstream sides of the channel. is there.

[0015]

Next, an embodiment of the present invention will be described.

A communication path test apparatus according to the present invention is a communication path test apparatus in a digital mobile communication switching system, wherein a plurality of return points are provided in a high-efficiency code CODEC inserted into the communication path, and a plurality of return points are provided in the communication path. A test section that can send out test data of different types and tests the communication path by comparing the test data returned from the return point; a high-efficiency code CODEC; And a control unit for selecting test data.

Further, according to the present invention, there is provided a method for testing a channel in a switching system for digital mobile communication, wherein a plurality of return points are provided in a high-efficiency code CODEC inserted into the channel. A procedure for storing a plurality of types of test data, a procedure for specifying each of the return point and the test data, and a step of transmitting the specified test data to the communication path and returning at the specified return point. And comparing the received test data with the test data.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing one embodiment of a communication path test apparatus of the present invention in a digital mobile communication switching system. This embodiment comprises a test section 1 for comparing the transmitted test data with the test data looped back at the loopback point to test the communication path, and a high efficiency coding / decoding of high efficiency voice data. Code COD
Sending a control order, such as a test execution instruction and a test type instruction, to the EC4, the time division switch 2 that can be switched in units of time slots, the high efficiency code CODEC4, the time division switch 2, and the test unit 1. And a control unit 3 that can perform the operation.

The high-efficiency codec CODEC 4 includes an encoding unit 5 that can convert μ-law audio data into high-efficiency code audio data and a decoding unit that can convert high-efficiency audio data into μ-law audio data. A section 6 is provided.
Further, the first return point, the second return point, and the third return point can be set according to the control order from the control unit 3. At the first return point, the test data is directly returned at the far end of the communication path, and at the second return point, the μ-law audio data is input to the encoding unit 5 and the converted high-efficiency code data is directly sent to the upstream highway 8. At the third turning point, high-efficiency code data is input to the decoding unit 6. As a result, the decoded μ-law audio data is returned to the uplink highway 8.

FIG. 2 is a block diagram showing details of the test section 1. As shown in FIG. The test section 1 includes a transmission section 11 connected to the time division switch 2 for transmitting test data, a data reception section 12 for receiving data from the time division switch 2, pulling in necessary line data from the highway, and A highway interface unit 13 for inserting test data to be transmitted,
A test data buffer 14 having μ-law audio data and test data of high-efficiency code data of a low bit rate corresponding to the data for a speech path test, and reception data pulled in by the highway interface unit 13 can be stored. The reception data buffer 15 receives the test execution instruction / test type instruction from the control unit 3 and receives the test data buffer 1
4 instructs test data, and calculates S / S from expected value data for transmitted test data and received data.
It comprises an arithmetic unit 16 for calculating the N ratio, checking bits in bit units, and determining the quality of the communication path.

At the time of performing the test, first, the control unit 3 sends out the test type and the control order 9 for performing the test to start the test.
According to the control order 9, the time-division switch 2 uses the high-efficiency code CODE for the ascending highway 8 and the descending highway 7.
The switch path between the C4 and the test unit 1 is set, and the test unit 1 is set.
And the line to be tested are connected.

At the time of a normal test, in accordance with an instruction from the control unit 3, the high-efficiency CODEC 4 performs a normal return setting at a first return point, and the arithmetic unit 16 controls the μ-law audio data stored in the test data buffer unit 14. The transmission unit 11
The receiving unit 12 receives the data sent out of the high efficiency code CODEC4 and returned. The arithmetic unit 16 calculates the S / N ratio of the received data and the test data and compares the S / N ratio with a set threshold value to confirm the normality of the communication path.

When it is desired to detect a detailed failure detection point, the test type is set to the second return point in the control order 9. The test data buffer unit 14 of the test unit 1 sends μ-law audio data, and outputs the high-efficiency code CO
When received by the DEC 4, the data is converted into high-efficiency audio data by the encoding unit 5 and returned to the test unit 1 via the second turning point. The received data is accumulated in the received data buffer unit 14 of the test unit 1, the high efficiency code data of the expected value data for the transmitted test data is read out from the test data buffer 14, and a bit check is performed on a bit-by-bit basis. Check health.

When the test data is high efficiency code data, the test data buffer 14 sends the high efficiency code data to the target high efficiency code CODEC4. The third return point in the high-efficiency code CODEC 4 is set by the return control, and the μ-law audio data converted by the decoding unit 6 is returned to the test unit 1 as return data.
The test unit 1 accumulates the folded reception data in the reception data buffer unit 15 and calculates an S / N ratio, which is a noise ratio, from the received data and μ-law audio data of expected value data for the test data, The normality of the communication path is detected by comparing the value with a set threshold value.

FIG. 3 is a more specific version of the test section 1 of FIG. 2. The transmitting section 11 of FIG. 2 is a driver 31, the receiving section 12 is a receiver 32, and the highway interface 13 is two selectors 33 and 34. Two registers 35, 3
6. Test data buffer 14 is read only memory 3.
7. The reception data buffer 15 corresponds to the random access memory 38, and the operation unit 16 corresponds to the processor 39.

In the read-only memory 37, μ-law
The voice data and high-efficiency code data obtained by converting the data into low bit rate voice data are stored. When a test instruction / test type instruction is given by the control order 9, the μ-law audio is given by the test type instruction. Data is sent or high-efficiency code data is written into the register 35. Selector 33
Then, the test data is read from the register 35 based on a predetermined timing from the processor 39, inserted into a time slot on the highway, and transmitted by the driver 31.

When the receiver 32 receives the transmitted test data from the time division switch 2, the corresponding time slot on the highway is pulled in by the selector 34 and temporarily written into the register 36. The processor 39 writes the value of the register into the random access memory 38 and stores it. An S / N ratio, which is a noise ratio, is calculated from the stored received data and the transmitted test data, and a bit check is performed on a bit-by-bit basis to confirm the normality of the line of the communication path.

The operation at each return point will be described below. In the high-efficiency code CODEC4, it is possible to control the return point based on the test type instruction at the time of executing the test. In FIG. 3, normally, the test data for performing the channel test at the first return point is converted to μ-law audio data. In this case, the test unit 1 sets μ-law as received data.
The processor 39 calculates the S / N ratio, which is a noise ratio, based on the test data and the received data that have been received and transmitted, and compares the S / N ratio with a set threshold to confirm the normality of the communication line. I do. When the test data is high-efficiency code data, the test section 1 receives the high-efficiency code data as reception data, checks the transmission data and the reception data in bit units, and compares the number of bit errors with a set threshold. To check the normality of the communication line.

When the test type is specified at the second turning point, the read only memory
The voice data is read out as test data and the high efficiency code CO
The high-efficiency code data encoded by the encoding unit 5 of the DEC 4 becomes the reception data. The high-efficiency code data corresponding to the transmitted test data is read from the read-only memory 37, and checked in bit units to check the normality of the communication line. Check.

When a test type instruction is issued at the third return point, high-efficiency code data is sent out as test data, and the μ-law audio data decoded by the decoding unit 6 of the high-efficiency code CODEC 4 is received. And Μ-law audio data corresponding to the test data is read out from the read-only memory 37 and the S / N ratio between the received data is calculated to check the normality of the communication path.

A fault in the encoding unit 5 or the decoding unit 6 can be specified by the loopback test using the second loopback point and the third loopback point. That is, if an error is detected as a result of the test at the first turning point and normal as a result of the test at the second turning point, it is determined that the encoding unit 5 has a fault. Also, the first
The result of the test at the turning point is normal,
If an error is detected as a result of the test at the third turning point, it is determined that the decoding unit 6 has a failure.

[0032]

As described above, according to the present invention, high-efficiency code data corresponding to μ-law audio data is stored in a test section as test data.
By providing a plurality of return points in the DEC such as uplink data return, downlink data return, and uplink / return data return, it is possible to execute a test on only the up side or a test on only the down side. In a switching system, it is possible to easily confirm the normality of a communication path when testing a communication path including a high-efficiency code CODEC, and to detect a failure point in detail when a failure occurs in the communication path. Have.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention.

FIG. 2 is a detailed block diagram of a test unit 1 in the embodiment of FIG.

FIG. 3 is a diagram showing a specific example of a test unit 1 in FIG.

FIG. 4 is a diagram showing an example of the related art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Test part 2 Time division switch 3 Control part 4 High efficiency code CODEC 5 Encoding part 6 Decoding part 11 Receiving part 12 Transmitting part 13 Highway interface part 14 Test data buffer part 15 Receive data buffer part 16 Operation part 21 Digital communication line Reference Signs List 22 communication path 23 radio base station 24 high efficiency CODEC 27 mobile station 28 test circuit 31 driver 32 receiver 33 selector 34 selector 35 register 36 register 37 read-only memory 38 random access memory 39 processor 81 test pattern storage unit 82 transmission circuit 83 reception circuit 84 Received signal storage unit 85 Control circuit

Claims (7)

[Claims] 1. A communication path test apparatus in a digital mobile communication switching system, wherein a plurality of return points are provided in a high-efficiency code CODEC inserted into the communication path, and a plurality of types of test data can be transmitted to the communication path. A test unit for testing the communication path by comparing the test data returned from the return point, a control for instructing the high-efficiency code CODEC and a test type to the test unit to select the return point and test data; And a communication path test device. 2. The test data is μ-law audio data and high-efficiency code data, and at the first turning point, the high-efficiency code data obtained by converting the μ-law audio data by an encoding unit is used. At the turn-back point and at the second turn-back point, the high-efficiency code data is
The speech path test apparatus according to claim 1, wherein the speech data is input to a decoding unit that converts the speech data into w audio data. 3. The test section includes a test data buffer section that stores the test data in advance, a transmission section that transmits the test data to the communication path, and a reception section that receives the folded test data. Unit, a reception buffer unit for storing received test data, and a test time slot from the communication path between the test data buffer unit, the reception buffer unit, the transmission unit, and the reception unit. A highway interface unit for inserting the test data into the test time slot, and an operation unit for selecting the test data, controlling the highway interface unit, and comparing the test data according to an instruction from the control unit. The communication path test apparatus according to claim 1 or 2, wherein: 4. The highway interface unit includes a register provided on each of an ascending highway and a descending highway, for temporarily storing the test data, and a silence signal which is always selected but controlled by the arithmetic unit. 4. The apparatus according to claim 3, further comprising a selector for selecting a register. 5. The apparatus according to claim 3, wherein said test data buffer section comprises a read-only memory. 6. A method for testing a communication path in a digital mobile communication switching system, comprising the steps of providing a plurality of return points in a high-efficiency code CODEC inserted into the communication path, and storing a plurality of types of test data. And a procedure for designating each one of the loopback point and the test data, and a procedure of transmitting the specified test data to the communication path and comparing with the test data looped back at the specified loopback point. A communication path test method comprising: 7. The test data is μ-law audio data and high-efficiency code data, and at the first turning point, the high-efficiency code data obtained by converting the μ-law audio data by an encoding unit is used. At the turn-back point and at the second turn-back point, the high-efficiency code data is
7. The communication path test method according to claim 6, wherein the data is input to a decoding unit for converting into w audio data.