JP3196730B2 - Channel test apparatus and channel test method - Google Patents

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. It instructs the receiving circuit 83 that can receive, the received signal accumulating section 84 that can accumulate the received data that has been received, and the test pattern storage section 81 the transmission data, and calculates the received data and the 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 conventional communication line test circuit described above, the test pattern sent from the test circuit 28 is encoded once by the encoding circuit of the high efficiency CODEC 24, and the converted high efficiency code data is folded 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]

According to the present invention, a plurality of return points are provided in a high-efficiency code CODEC inserted into a communication path, and a plurality of types of test data can be transmitted to the communication path so that the return points can be transmitted from the return points. It is by comparison with the incoming test data marks in the high efficiency encoding CODEC
A digital mobile communication system comprising: a test section for checking a failure of an encoding section or a decoding section; and a control section for instructing the high-efficiency code CODEC and the test section to select a test type to select the return point and test data. A communication path test apparatus for an exchange system, wherein the control unit controls the first loopback.
If a point is selected, the test
Μ-law audio data as data,
Section converts the μ-law audio data into high-efficiency code data.
In other words, the high-efficiency code data is
And the decoding unit converts the high-efficiency code data to μ.
-Law sound data converted and converted μ-law sound
The voice data is received by the test unit, and the second
If the turning point is selected,
Sending μ-law audio data as the test data,
The μ-law audio data is efficiently encoded by the encoding unit.
Data is converted to high efficiency at the second turning point
The high-efficiency code data obtained by folding the code data
Data is received by the test section, and a third folder is received by the control section.
If a return point is selected, the test
High efficiency code data as test data,
The high efficiency code data is wrapped at the wrap point,
The decoding unit converts the high-efficiency code data into μ-law audio data.
Data and convert the converted μ-law audio data to the
It is characterized in that it is received by the testing unit .

[0010]

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.

The present invention also provides a procedure for providing a plurality of return points in a high-efficiency code CODEC inserted into a communication channel, a procedure for storing a plurality of types of test data, A procedure for designating each one of the test data, and comparing the designated test data with the test data returned at the designated return point by transmitting the designated test data to the communication path, thereby obtaining the high-efficiency code COD.
Examining a coding unit or a decoding unit in the EC for a fault. A method for testing a communication path of a digital mobile communication switching system, comprising:
If a point is specified, the test
Μ-law audio data as the data,
Converts the μ-law audio data into highly efficient code data
Then, high-efficiency code data is obtained at the first turning point.
The decoding unit converts the high-efficiency code data into μ-
converted to raw audio data and converted μ-law audio
The data is received by the test unit, and a second data is received by the control unit.
If a return point is specified, the
Μ-law audio data as the test data
The coding unit encodes the μ-law audio data into a highly efficient encoded data.
Data at the second turn-back point.
The high-efficiency code data obtained by folding and converting the code data
Is received by the test unit, and the control unit returns a third return
If points are specified, the test
The high efficiency code data is transmitted as data, and the third
The high-efficiency code data is looped back at the loop-back point, and
The high-efficiency code data is converted into μ-law audio data by an encoding unit.
And converts the converted μ-law audio data to the test
It is characterized in that it is received by a unit .

[0013]

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 operations.

The high-efficiency codec CODEC 4 includes an encoding unit 5 that can convert μ-law audio data into high-efficiency code data and a decoding unit that can convert high-efficiency code data into μ-law audio data. 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 turning point,
At the far end of the communication path, the test data is returned as it is, and at the second return point, the test data μ-law
The audio data is input to the encoding unit 5, and the converted high-efficiency encoded data is directly returned to the upstream highway 8,
At the loopback point, the high-efficiency code data
The data is turned back and input to the decoding unit 6, and the decoded μ
-Return the raw audio data to the upstream 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 the first return point, and the arithmetic unit 16 performs the μ-law audio data holding 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 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 μ-law audio data held in the test data buffer unit 14 of the test unit 1 is transmitted and, when received by the high-efficiency code CODEC4, is converted into high-efficiency audio data by the encoding unit 5 and passed through the second turning point for testing. Returned to unit 1. Received data buffer unit 14 of test unit 1
Then, 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 the normality on the downstream side is confirmed by performing a bit check in bit units.

[0024] If the test data is high-efficiency encoded data is high-efficiency encoded data with the test data buffer 14, and sends the high-efficiency coding CODEC4 of interest. The third return point in the high-efficiency code CODEC 4 is set by the return control, and the μ-law converted by the decoding unit 6 is set.
The voice data is returned to the test section 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. The data or the high efficiency code data is written into the register 35. The selector 33 reads the test data from the register 35 based on a predetermined timing from the processor 39, inserts the test data into a time slot on the highway, and sends it out by the driver 31.

When the transmitted test data is received by the receiver 32 from the time division switch 2, the corresponding time slot of the highway is pulled in by the selector 34, and is temporarily written in the register 36. Register 3 in processor 39
The value of 6 is written and stored in the random access memory 38. The accumulated or calculated S / N ratio from the received data and sends the test data is noise ratios performs bit check bits, to confirm the normality of the circuit 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 into 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, the 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 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.

The failure 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 and 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 one 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 (5)

(57) [Claims] 1. A high-efficiency code CODEC inserted into a communication channel.
A plurality of return points, and a plurality of types of test data can be transmitted to the communication path, and a coding unit or a decoding unit in the high-efficiency code CODEC is compared with test data returned from the return point. And a control unit for instructing the test unit to specify a test type and selecting the return point and test data. Wherein the first turning point is selected by the control unit.
In the case, μ-law is used as the test data from the test section.
The audio data is transmitted, and the μ-law sound is output by the encoding unit.
Voice data into high-efficiency code data,
Wraps the high-efficiency code data at the return point,
Conversion unit converts the high-efficiency code data into μ-law audio data.
Converting the converted μ-law audio data into the test unit
And a second return point is selected by the control unit.
In the case, μ-law is used as the test data from the test section.
The audio data is transmitted, and the μ-law sound is output by the encoding unit.
Voice data into high-efficiency code data,
The high efficiency code data is wrapped at the return point,
The high efficiency code data is received by the test unit, and the control unit selects a third turning point.
In the case, a high-efficiency code is used as the test data from the test section.
Data is sent out at the third turnaround point for high efficiency
The code data is folded back, and the high-efficiency code is decoded by the decoding unit.
The data is converted to μ-law audio data, and the converted μ
A speech path test apparatus , wherein the test section receives raw audio data . A test data buffer unit for storing the test data in advance; a transmitting unit for transmitting the test data to the communication path; and a receiving unit for receiving the returned 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 speech channel test device according to claim 1, wherein: 3. The highway interface unit includes a register provided on each of an ascending highway and a descending highway, for temporarily holding the test data, and a silence signal which is always selected but controlled by the arithmetic unit. 3. The apparatus according to claim 2, further comprising a selector for selecting a register. 4. The apparatus according to claim 2, wherein said test data buffer comprises a read-only memory. 5. A high-efficiency code CODEC inserted into a communication channel.
A procedure for providing a plurality of return points in the inside, a procedure for storing a plurality of types of test data, a procedure for specifying each of the return points and the test data,
By transmitting the specified test data to the communication path and comparing the test data with the test data returned at the specified return point, the failure of the coding unit or the decoding unit in the high-efficiency code CODEC can be solved. Checking a call path of the digital mobile communication switching system, wherein the first return point is designated by the control unit.
In the case, μ-law is used as the test data from the test section.
The audio data is transmitted, and the μ-law sound is output by the encoding unit.
Voice data into high-efficiency code data,
Wraps the high-efficiency code data at the return point,
Conversion unit converts the high-efficiency code data into μ-law audio data.
Converting the converted μ-law audio data into the test unit
And a second return point is designated by the control unit.
In the case, μ-law is used as the test data from the test section.
The audio data is transmitted, and the μ-law sound is output by the encoding unit.
Voice data into high-efficiency code data,
The high efficiency code data is wrapped at the return point,
The test section receives the high-efficiency code data and a third return point is designated by the control section.
In the case, a high-efficiency code is used as the test data from the test section.
Data is sent out at the third turnaround point for high efficiency
The code data is folded back, and the high-efficiency code is decoded by the decoding unit.
The data is converted to μ-law audio data, and the converted μ
A speech path test method , wherein the test section receives raw voice data .