JPH11112445A - Transmission line characteristic test equipment - Google Patents

Abstract

(57) [Problem] To provide a transmission path characteristic test apparatus for detecting a transmission path failure at an early stage and performing a highly efficient transmission path characteristic test. SOLUTION: An information collecting means 11 collects communication control information 1 for performing communication control between a plurality of devices on a transmission path and failure information 2 for which communication control has failed. The transmission line characteristic value calculation means 12 calculates the transmission line characteristic value of the transmission line from the collected communication control information 1 and failure information 2. The test target determining means 13 determines the state of the transmission path based on the transmission path characteristic value, and sets the transmission path whose determination result is abnormal as the test target. The transmission path characteristic test execution unit 14 performs a transmission path characteristic test on the transmission path to be tested. The result notifying means 15 notifies the result of the transmission path characteristic test.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission path characteristic test apparatus, and more particularly to a transmission path characteristic test apparatus for determining a transmission path to be tested for transmission path characteristics and performing a transmission path characteristic test.

[0002]

2. Description of the Related Art At present, a variety of telecommunication services are required, and communication networks for providing these services are becoming more complicated and enormous.

In such a situation, in order to operate and maintain the transmission line of the communication network, alarm information and the like from transmission facilities installed in a wide area are aggregated in a maintenance center, and a failure point is quickly and accurately determined. It is necessary to notify the maintenance person in advance.

[0004] A transmission path characteristic test is generally performed to isolate a fault location and to monitor a fault. For example, in a mobile communication system, one MSC (Mobile Switching Center) can store hundreds of BSs.
(Base station) is monitored, and MS (mobile equipment) is monitored during monitoring.
Transmission path characteristics tests are performed on the transmission paths up to and to isolate and monitor failures.

FIG. 19 is a diagram showing an outline of a transmission path characteristic test in a mobile communication system. In the illustrated mobile communication system, the MSC 300 and the BS 310 are connected. Then, the MSC 300 measures the bit error rate B
ERT301 and BB302 which performs baseband processing
And

[0006] The BS 310 is an MDE (wireless transceiver).
311, AMP (wireless amplifier) 313, TTR
(Test transceiver) 314. Also, MDE31
1 includes a TRX (transmitter / receiver board) 311 a to 311 n and a control unit 312.

The TRXs 311a to 311n exist for each radio channel, and perform transmission / reception processing of TCH and CCH on the radio channel. (For example, the wireless channel 1ch is TR
The transmission / reception processing is performed in X311a, and the radio channel nch is T
The transmission and reception processing is performed by the RX 311n. ) The control unit 312
The entire control of the TRXs 311a to 311n is performed.

[0008] The AMP 313 includes TRXs 311a to 311.
n, and amplifies the communication data composed of the TCH and CCH received from n, and transmits the amplified data on the radio channel assigned by any of TRXs 311a to 311n.

On the contrary, the communication data is received and amplified,
It transmits to any of the TRXs 311a to 311n of the corresponding wireless channel. The TTR 314 is used as a pseudo MS for transmitting and receiving communication data.

In a transmission line characteristic test performed in such a mobile communication system, first, the MSC 300 transmits the BS 310
To send the standard coded test signal. And BS310
A test is performed to measure the bit error rate with the return signal returned from. After that, the test result is compared with a variable reference value to determine normal / abnormal. The judgment result is notified to the maintenance person.

In the transmission line characteristic test, a failure point is isolated by changing a return point or a transmission line. The loopback test includes a BB loopback test for the transmission path in the MSC 300 and an MDE311.
There is an MDE loopback test for the transmission path up to the MS, a TTR loopback test for the transmission path to the MS, and the like.

Next, a test procedure of the TTR loopback test for the transmission path to the MS will be described with reference to FIG. [S60] The BERT 301 transmits a standard encoded test signal. [S61] The BB 302 receives the standard coded test signal, converts it into a baseband, and transmits it to the BS 310. [S62] The BS 310 receives the standard encoded test signal after baseband conversion by the MDE 311. The control unit 312 receives an instruction as to which TRX to perform transmission processing on the received standard encoded test signal, and transmits the standard encoded test signal transmitted and processed by the corresponding TRX to the AMP 313. [S63] The AMP 313 amplifies the standard coded test signal and transmits it on the radio channel assigned by TRX. [S64] The TTR 314 used as the pseudo MS is
Receive a standard encoded test signal. [S65] The TTR 314 loops back and transmits the standard encoded test signal. [S66] The AMP 313 receives and amplifies the standard encoded test signal, and transmits the amplified signal to the MDE 311. [S67] The MDE 311 performs reception processing on the corresponding TRX, and transmits it to the BB 302. [S68] The BB 302 transmits the received standard encoded test signal to the BERT 301. [S69] The BERT 301 performs a bit error rate measurement test on the return signal, and compares the test result with a variable reference value to determine whether the signal is normal or abnormal. Then, the result of the determination is notified to the maintenance person.

Since the TCH path is established using the CCH as the radio channel used at the time of TTR return, both the CCH and TCH can be confirmed in the TTR return test.

In the fault monitoring in the transmission path characteristic test as described above, the TCH is used evenly within the CZ (wireless zone). For this reason, when confirming the normality of the transmission path to the MS for all the accommodated BSs (all transmission paths), conventionally, a transmission path characteristic test of TTR return is periodically performed to confirm the normality. Was.

In order to confirm the normality of the transmission path up to the MS after the addition or relocation of the BS, conventionally, a maintenance person performs a TTR return transmission path characteristic test on the target BS,
The normality of the transmission path in S was confirmed.

[0016]

However, in the conventional transmission line characteristic test as described above, a failure cannot be detected unless a characteristic test is performed on all transmission lines, so that the presence or absence of a transmission line failure cannot be detected at an early stage. There was such a problem.

Further, at the time of TTR loopback, a failure cannot be detected unless a characteristic test is performed on all transmission paths.
There is a problem that a failure of a CCH used for establishing a TCH path in a wireless channel at the time of TR return cannot be detected early.

Further, when performing a transmission path characteristic test corresponding to a channel, since the designation of the channel switching source and the switching destination is left to a maintenance person, a channel having a high failure rate cannot be recognized well, and an efficient test cannot be performed. There was such a problem.

In addition, since a failure is determined based on the results of a transmission line characteristic test that is periodically performed, there is a problem that even a temporary failure caused by a disturbance of a radio wave is recognized as a transmission line failure. .

Furthermore, since the operation of confirming the normality of the transmission line requires a complicated operation if performed manually, there is a problem that it takes a long time to confirm the normality of the added or relocated transmission line. The present invention has been made in view of such a point, and an object of the present invention is to provide a transmission path characteristic test apparatus that detects a transmission path failure at an early stage and performs a highly efficient transmission path characteristic test.

Another object of the present invention is to provide a transmission line characteristic test apparatus for performing a highly efficient transmission line characteristic test by shortening the work time for checking the normality and the like of the added or relocated transmission line. Is to provide.

[0022]

According to the present invention, in order to solve the above-mentioned problems, a transmission line for performing a transmission line characteristic test is determined as shown in FIG. An information collection unit 11 for collecting, in the characteristic test device 10, communication control information 1 for performing communication control between a plurality of devices on a transmission path and failure information 2 for which communication control has failed.
Transmission line characteristic value calculation means 1 for calculating a transmission line characteristic value of a transmission line from the collected communication control information 1 and failure information 2
2, a test object determining means 13 for judging the state of the transmission line based on the transmission line characteristic value, and testing the transmission line having an abnormal judgment result as a test object. A transmission path characteristic test apparatus 10 is provided, comprising: a transmission path characteristic test execution unit 14 for performing a test; and a result notification unit 15 for notifying a result of the transmission path characteristic test.

Here, the information collecting means 11 is provided with communication control information 1 for controlling communication between a plurality of devices on a transmission line.
And failure information 2 in which communication control has failed. The transmission path characteristic value calculating means 12 collects the communication control information 1
And the failure information 2 to calculate the transmission line characteristic value of the transmission line. The test target determining means 13 determines the state of the transmission path based on the transmission path characteristic value, and sets the transmission path whose determination result is abnormal as the test target. The transmission line characteristic test execution means 14
A transmission path characteristic test is performed on the transmission path to be tested. The result notifying means 15 notifies the result of the transmission path characteristic test.

Further, as shown in FIG. 15, in a transmission line characteristic test apparatus 20 for determining a transmission line to be tested for transmission line characteristics and performing a transmission line characteristic test, the transmission line of a newly laid transmission line is transmitted. Transmission path restoration confirmation means 2 for confirming path restoration
1, a transmission line characteristic test execution unit 22 for performing a transmission line characteristic test on the transmission line after confirming the restoration of the transmission line, and a result notifying unit 23 for notifying the result of the transmission line characteristic test. A transmission line characteristic test device 20 is provided.

Here, the transmission line restoration confirmation means 21 confirms the transmission line restoration of the newly laid transmission line. After confirming the restoration of the transmission path, the transmission path characteristic test execution unit 22 performs a transmission path characteristic test on the transmission path. The result notifying unit 23 notifies a result of the transmission path characteristic test.

[0026]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a principle diagram of a transmission line characteristic test apparatus 10 according to the present invention.

The information collection means 11 includes communication control information 1 for performing communication control between a plurality of devices (in the figure, between device A and device B) on a transmission path, and failure information 2 for which communication control has failed.
And collect.

The transmission line characteristic value calculating means 12 calculates the transmission line characteristic value of the transmission line between the device A and the device B from the collected communication control information 1 and failure information 2. The test target determining means 13 determines the state of the transmission path based on the transmission path characteristic value, and determines the transmission path whose determination result is abnormal as the test target.

The transmission path characteristic test execution means 14 automatically performs a transmission path characteristic test on the transmission path to be tested. Here, the transmission path characteristic test is, for example, a characteristic test for measuring a bit error rate using a folded signal as described with reference to FIG.

The result notifying means 15 notifies the result of the transmission path characteristic test to the maintenance person 31 through the maintenance terminal 30. Next, the operation will be described. FIG. 2 is a flowchart showing an operation procedure of the transmission line characteristic test apparatus 10 of the present invention. [S1] The information collection unit 11 collects communication control information 1 for performing communication control between a plurality of devices on a transmission path and failure information 2 for which communication control has failed. [S2] The transmission path characteristic value calculating means 12 calculates the transmission path characteristic value of the transmission path from the collected communication information 1 and failure information 2. [S3] The test target determination means 13 determines the state of the transmission path based on the transmission path characteristic value, and sets the transmission path whose determination result is abnormal as the test target. [S4] The transmission path characteristic test execution unit 14 performs a transmission path characteristic test on the transmission path to be tested. [S5] The result notifying unit 15 notifies the result of the transmission path characteristic test.

Next, a case where the transmission path characteristic testing apparatus 10 of the present invention is applied to a mobile communication system will be described. An MSC (Mobile Switching Center), a BS (Base Station), a BCE (Base Station Controller), and an MS (Mobile Station) are arranged on a transmission path of the mobile communication system.

The first embodiment of the present invention collects the total number of outgoing / incoming calls and the number of BS-factor-disconnected calls, obtains a call loss rate, determines a transmission path to be tested, and determines transmission path characteristics. The test is performed.

FIG. 3 is a diagram showing a flow of information collection according to the first embodiment. MSC 100 is the originating BS 120
Is connected to the BS 130 on the receiving side. MSC10
0 is connected to the BCE 110 that controls the BS 120 and the BS 130.

Then, the MSC 100 operates the information collecting means 1
1 includes a call setting / disconnection information table 11a, and collects, as communication control information 1, the total number of outgoing / incoming calls from MS1 to MS2, and as failure information 2, the number of BS-factor-disconnected calls caused by BS. I do.

The reasons for the failure caused by the BS are as follows: network failure, temporary failure, exchange congestion, request line / request channel available, invalid information element contents, call state and message inconsistency, and recovery due to timer expiration. There is (RCR
According to the provisions of STD-27E. ), The present invention also covers these BS factors.

The BS 120 includes the MDE 121 and the AMP 1
23 and the TTR 124. MDE121 is T
RX 121 a to 121 n and control unit 122.

The TRXs 121a to 121n exist for each radio channel, and perform transmission / reception processing of TCH and CCH on the radio channel. For example, the radio channel 1ch is TRX
The transmission / reception processing is performed in the communication channel 121a, and the radio channel nch is set to TR
The transmission and reception process is performed in X121n. Each channel is 2
It consists of TCH + CCH or 3TCH. Control unit 1
Reference numeral 22 performs overall control of the TRXs 121a to 121n.

The AMP 123 has TRXs 121a to 121
n, and amplifies the communication data composed of the TCH and CCH received from n, and transmits the amplified data on the radio channel allocated by one of the TRXs 121a to 121n.

Conversely, receiving and amplifying communication data,
It transmits to any of the TRXs 121a to 121n of the corresponding wireless channel. The TTR 124 is used as a pseudo MS for transmitting and receiving communication data.

Since the inside of the BS 130 is the same as that of the BS 120, the description of the configuration is omitted. Next, a flow of information collection of the first embodiment will be described. Here, it is assumed that the call is transmitted from MS1 to MS2. [S10] The AMP 123 receives and amplifies the communication data transmitted from the MS 1, and transmits it to any of the TRXs 121a to 121n (here, the TRX 121a) corresponding to the wireless channel used for the transmission by the MS 1. [S11] The TRX 121a performs communication data reception processing and transmits the communication data to the MSC 100 via the control unit 122. [S12] After receiving the communication data from the BS 120, the MSC 100 transmits the communication data to the BCE 110. [S13] The BCE 110 converts the communication data into the MSC format and transmits the data to the MSC 100 again. MSC
At 100, the communication data converted to the MSC format is received. [S14] The information collection unit 11 in the MSC 100
The number of outgoing calls is counted up with reference to the “outgoing wireless status report” in the communication data. If the call is disconnected due to the BS factor, the number of BS factor disconnected calls is counted up. These count values are recorded in the call setting / disconnection information table 11a. [S15] The MSC 100 transmits the communication data to the BCE 110, and the BCE 110 converts the communication data into the BS 130 format. [S16] The MSC 100 receives the communication data converted into the BS 130 format and transmits the communication data to the BS 130. [S17] One of the TRXs 131a to 131n in the BS 130 (here, the TRX 131a) performs transmission processing, and then transmits to the AMP 133. [S18] The AMP 133 amplifies the communication data after the transmission processing and transmits the amplified communication data to the MS 2. [S19] The information collection unit 11 in the MSC 100
After the second incoming call, the number of incoming calls is counted up with reference to the “incoming wireless status report”. If the incoming call is disconnected due to the BS factor, the number of BS factor disconnected calls is counted up. These count values are stored in the call setup / disconnection information table 1
1a.

Next, a first modification of the first embodiment will be described. In the first modification, the transmission line characteristic test apparatus 10 is an MSC.
It is the case where it is included in. FIG. 4 shows the MSC 10 of the first modification.
It is a figure which shows the internal structure of 0a.

The information collecting means 11 collects "transmission radio status report" and "reception radio status report" as communication control information 1 from the transmission / reception signal, and a call disconnection event due to BS as failure information 2, and performs call setting / call setting. CZ in the cutting information table 11a
Record for each + TRX.

The transmission line characteristic value calculating means 12 is started by the OS cycle component 16 in a cycle of 15 minutes. Then, CZ + TRX is sent from the call setup / disconnection information table 11a.
The data is read out every time, and the blocking rate is calculated by the following equation. After reading the data, the table is cleared to 0.

[0044]

## EQU1 ## Call loss rate (%) = (BS factor disconnected call number / total number of incoming / outgoing calls) × 100 (1) The test target determining means 13 determines that the call loss rate of the equation (1) is a reference value set in advance. If it exceeds, it will be judged as abnormal,
This transmission path is to be tested.

The transmission line characteristic test execution means 14 extracts all transmission lines accommodated in the corresponding CZ + TRX. Then, a transmission path characteristic test is performed on the transmission path subjected to the test.

The result notifying means 15 notifies the result of the transmission path characteristic test through the maintenance terminal 30 as an alarm. Next, a second modification of the first embodiment will be described. Modification 2
Is a case where the information collecting means 11 is included in the BCE and the other means of the transmission path characteristic test apparatus 10 are included in the MSC. FIG. 5 shows the MSC 100b and BCE1 of the second modification.
It is a figure which shows the internal structure of 10b.

The information collecting means 11 collects “transmission radio status report” and “reception radio status report” as communication control information 1 from the transmission / reception signal and a call disconnection event due to BS as failure information 2, and sets up a call. CZ in the cutting information table 11a
Record for each + TRX.

Call setup / disconnection information transfer component 17
a is started by the OS cycle component 16 at a cycle of 15 minutes. Then, data is read from the call setting / disconnection information table 11a for each CZ + TRX, and the MSC 100b
Transfer to After reading data, the table is set to 0.
clear.

The transmission line characteristic value calculation means 12 inside the MSC 100b calculates the call loss rate by the equation (1). Subsequent processing procedures are the same as those in FIG. Next, a third modification of the first embodiment will be described. Modification 3
The information collection means 11, the transmission path characteristic value calculation means 12, and the test object determination means 13 are included in the BCE, and the transmission path characteristic test execution means 14, and the result notification means 15 are included in the MSC. It is.

FIG. 6 shows the MSC 100c and the BCE of the third modification.
It is a figure showing an internal configuration of 110c. The operation of the third modification is the same as that of the first modification described with reference to FIG.

Here, when the processing of each means of the transmission path characteristic test apparatus 10 is performed in the MSC as in the first modification, the MSC
It needs to be converted to a format. However, when the processing is shared in the BCE as in Modifications 2 and 3, since processing such as format conversion is not required, the processing time from information collection to test object determination can be reduced.

As described above, in the first embodiment of the present invention, the occurrence rate of a call disconnection event is always monitored at the time of originating / terminating to determine a transmission path for which a characteristic test needs to be performed. The transmission line characteristic test is automatically performed. As a result, it is possible to detect a transmission path failure at an early stage, and it is possible to quickly isolate a failure location.

Next, a second embodiment of the present invention will be described. The second embodiment collects the total number of location registrations and the number of location registration failures as BS factors, obtains a location registration failure rate, determines a transmission path to be tested, and performs a transmission path characteristic test. Is what you do.

FIG. 7 is a diagram showing a flow of information collection according to the second embodiment. MSC 101 performs location registration MS 1
Is connected to the BS 120 having. Further MSC101
Is connected to the BCE 111 that controls the BS 120.

Then, the MSC 101 transmits the information
1 includes a location registration / failure information table 11b used by
The communication control information 1 collects the total number of location registrations of the MS 1 and the failure information 2 collects the number of location registration failures caused by the BS. Here, the reason for the failure caused by the BS is the same as the reason for the failure described with reference to FIG.

Next, the flow of information collection according to the second embodiment will be described. Here, it is assumed that the MS 1 performs location registration. [S20] The AMP 123 receives and amplifies the communication data transmitted from the MS 1, and transmits the data to one of the TRXs 121a to 121n (here, the TRX 121a) corresponding to the wireless channel used by the MS 1 for location registration. [S21] The TRX 121a performs communication data reception processing, and transmits the communication data to the MSC 101 via the control unit 122. [S22] After receiving the communication data from the BS 120, the MSC 101 transmits the communication data to the BCE 111. [S23] The BCE 111 converts the communication data into the MSC format and transmits the data to the MSC 101 again. MS
C101 receives the communication data converted to the MSC format. [S24] The information collecting means 11 in the MSC 101
The number of position registrations is counted with reference to the “position registration request” in the communication data. If the location registration fails due to the BS factor, the number of location registration failures is counted. These count values are recorded in the position registration / failure information table 11b.

Next, a first modification of the second embodiment will be described. In the first modification, the transmission line characteristic test apparatus 10 is an MSC.
It is the case where it is included in. FIG. 8 shows the MSC 10 of the first modification.
It is a figure which shows the internal structure of 1a.

The information collecting means 11 collects a "location registration request" as communication control information 1 and a location registration failure event due to a BS factor as failure information 2 from the location registration signal, and stores it in the location registration / failure information table 11b. Record for each CCH.

The transmission line characteristic value calculating means 12 is started by the OS cycle component 16 at a cycle of 15 minutes. Then, data is read from the location registration / failure information table 11b for each CCH, and the location registration failure rate is calculated by the following equation. After reading the data, the table is cleared to 0.

[0060]

## EQU00002 ## Location registration failure rate (%) = (Number of location registration failures / Total location registration number) .times.100 (2) The test object determination means 13 sets the location registration failure rate of the equation (2) in advance. If the reference value exceeds a certain reference value, it is determined to be abnormal, and this CCH is set as a test target.

The transmission path characteristic test execution means 14 performs a transmission path characteristic test using the corresponding CCH. The result notifying unit 15 notifies the result of the transmission path characteristic test by an alarm via the maintenance terminal 30.

Next, a second modification of the second embodiment will be described. In the second modification, the information collection unit 11 is included in the BCE, and the other units of the transmission path characteristic test apparatus 10 are M
This is the case where it is included in the SC. FIG. 9 shows the MSC of the second modification.
It is a figure which shows the internal structure of 101b and BCE111b.

The information collecting means 11 collects a "location registration request" as communication control information 1 as a communication control information and a location registration failure event due to a BS factor as failure information 2 from the location registration signal, and stores it in a location registration / failure information table 11b. Record for each CCH.

Location registration / failure information transfer component 1
7b is activated by the OS cycle component 16 at a cycle of 15 minutes. Then, the location registration / failure information table 11
b, the data is read out for each CCH and transferred to the MSC 101b. After reading the data, the table is cleared to 0.

The transmission path characteristic value calculation means 12 inside the MSC 101b calculates the location registration failure rate by the equation (2). Subsequent processing procedures are the same as those in FIG. Next, a third modification of the second embodiment will be described. In the third modification, the information collection unit 11, the transmission path characteristic value calculation unit 12, and the test target determination unit 13 are included in the BCE, and the transmission path characteristic test execution unit 14 and the result notification unit 15
And is the case where it is included in the MSC.

FIG. 10 shows the MSC 101c and BC of the third modification.
It is a figure showing the internal composition of E111c. Modification 3
Are the same as those of the first modification described with reference to FIG.

Here, when the processing of each unit of the transmission path characteristic test apparatus 10 is performed in the MSC as in the first modification, the MSC
It needs to be converted to a format. However, when the processing is shared in the BCE as in Modifications 2 and 3, since processing such as format conversion is not required, the processing time from information collection to test object determination can be reduced.

As described above, according to the second embodiment of the present invention, the location registration failure event occurrence rate is constantly monitored at the time of location registration, and the CCH for which a characteristic test needs to be performed is determined. The transmission channel characteristic test is automatically performed using this CCH. As a result, it is possible to quickly detect that a TCH path cannot be established due to a CCH failure, and to quickly isolate a failure location.

Next, a third embodiment of the present invention will be described. In the third embodiment, the total number of channel switching requests and the number of channel switching failures that are BS factors are collected to determine a channel switching failure rate, a transmission path to be tested is determined, and transmission path characteristics are determined. The test is performed.

FIG. 11 is a diagram showing a flow of information collection according to the third embodiment. The MSC 102 connects to the channel switching source BS 120 and the channel switching destination BS 130. Further, the MSC 102 is connected to the BCE 112 that controls the BS 120 and the BS 130.

Then, the MSC 102 transmits the information
1 includes a channel switching information table 11c used by
The total number of channel switching requests of the MS 1 is collected as the communication control information 1 and the number of channel switching failures caused by the BS as the failure information 2.

Here, the reason for the failure caused by the BS is the same as the reason for the failure described with reference to FIG. Next, a flow of information collection according to the third embodiment will be described.
Here, it is assumed that the channel of MS1 is switched from CZ1 to CZ2. [S30] In the MSC 102, the switch destination zone C
After confirming that there is a free channel on the Z2 side, a channel to be allocated is selected from the channels, and the number of channel switching requests is recorded in the channel switching information table 11c. [S31] The BS 130 transmits the corresponding channel. [S32] The BS 120 notifies the switching to the channel corresponding to the MS1. [S33] If the MS 1 fails to switch the corresponding channel, the MS 1 counts the number of channel switching failures.

Next, a modified example 1 of the third embodiment will be described. In the first modification, the transmission line characteristic test apparatus 10 is an MSC.
It is the case where it is included in. FIG. 12 shows MSC1 of the first modification.
FIG. 2B is a diagram showing the internal configuration of the device 02a.

The information collecting means 11 collects a "channel switching request" as communication control information 1 as a communication control information and a channel switching failure event due to a BS as failure information 2 from the channel switching signal, and stores the C in the channel switching information table 11c.
Record for each Z + TRX.

The transmission line characteristic value calculation means 12 is started by the OS cycle component 16 in a cycle of 15 minutes. Then, CZ + TR is obtained from the channel switching information table 11c.
Data is read for each X, and the channel switching failure rate is calculated by the following equation. After reading the data, the table is cleared to 0.

[0076]

## EQU00003 ## Channel switching failure rate (%) = (number of channel switching failures / total number of channel switchings) .times.100 (3) The test target determination means 13 sets the channel switching failure rate of equation (3) in advance. If the value exceeds a certain reference value, it is judged to be abnormal, and this transmission line is to be tested.

The transmission path characteristic test executing means 14 extracts all transmission paths accommodated in the corresponding CZ + TRX. Then, a transmission path characteristic test is performed on the transmission path subjected to the test.

The result notifying means 15 notifies the result of the transmission path characteristic test through the maintenance terminal 30 as an alarm. Next, a second modification of the third embodiment will be described. Modification 2
Is a case where the information collecting means 11 is included in the BCE and the other means of the transmission path characteristic test apparatus 10 are included in the MSC. FIG. 13 shows the MSC 102b and the BCE of the second modification.
It is a figure showing the internal configuration of 112b.

The information collecting means 11 collects a “channel switching request” as communication control information 1 from the channel switching signal and a channel switching failure event due to the BS as failure information 2 from the channel switching signal, and stores the C in the channel switching information table 11c.
Record for each Z + TRX.

Channel switching information transfer component 1
7c is activated by the OS cycle component 16 at a cycle of 15 minutes. Then, the channel switching information table 11
The data is read from C for each CZ + TRX, and MSC1
02b. After reading the data, the table is cleared to 0.

The transmission path characteristic value calculation means 12 inside the MSC 102b calculates the channel switching failure rate by using the equation (3). The subsequent processing procedure is the same as in FIG.

Next, a third modification of the third embodiment will be described. In the third modification, the information collection unit 11, the transmission line characteristic value calculation unit 12, and the test target determination unit 13 are included in the BCE, and the transmission line characteristic test execution unit 14 and the result notification unit 15 are included in the MSC. This is the case.

FIG. 14 shows MSC 103c and BC of Modification 3
It is a figure showing the internal configuration of E113c. Modification 3
Is the same as that of the first modification described with reference to FIG.

Here, when the processing of each means of the transmission line characteristic test apparatus 10 is performed in the MSC as in the first modification, the MSC
It needs to be converted to a format. However, when the processing is shared in the BCE as in Modifications 2 and 3, since processing such as format conversion is not required, the processing time from information collection to test object determination can be reduced.

As described above, according to the third embodiment of the present invention, the occurrence rate of a channel switching failure event is constantly monitored at the time of channel switching, and a transmission path for which a characteristic test needs to be performed is determined. Thereafter, the transmission line characteristic test is automatically performed. As a result, it is possible to detect the impossibility of channel switching at an early stage, and it is possible to quickly isolate a failure location.

The transmission line characteristic test apparatus 10 of the present invention
Has a configuration in which a call loss rate and various failure rates, which are used to determine whether to perform the transmission path characteristic test, are calculated at regular intervals using the OS cycle component 16. As a result, the average within a certain time is calculated, so that a temporary failure due to temporary disturbance of radio waves is not recognized as a transmission path failure, and a highly efficient transmission path characteristic test can be performed.

Further, the transmission line characteristic test apparatus 10 of the present invention
Has a configuration in which a transmission path or a CCH that may have a failure is determined based on a call loss rate, a location registration failure rate, and a channel switching failure rate, and a transmission path characteristic test is performed. As a result, it is not necessary to perform a useless characteristic test on a normal transmission path, so that it is possible to suppress the influence on the subscriber due to the transmission path (wireless channel) capture (occurrence of wireless channel capture NG).

Next, for the newly laid transmission line,
A transmission line characteristic test apparatus for performing a transmission line characteristic test will be described. FIG. 15 is a principle diagram of the transmission line characteristic test apparatus 20 of the present invention.

The transmission path restoration confirming means 21 confirms the restoration of the transmission path of the newly laid transmission path (between the apparatus A and the apparatus B in the figure). After confirming the restoration of the transmission line, the transmission line characteristic test execution unit 22 performs a transmission line characteristic test on the transmission line.

The result notifying means 23 notifies the result of the transmission path characteristic test to the maintenance person 31 through the maintenance terminal 30. Next, the operation will be described. FIG. 16 is a flowchart showing the operation procedure of the transmission line characteristic test apparatus 20 of the present invention. [S40] The transmission line restoration confirmation means 21 confirms transmission line restoration of the newly laid transmission line. [S41] After confirming the restoration of the transmission path, the transmission path characteristic test execution unit 22 performs a transmission path characteristic test on the transmission path. [S42] The result notifying unit 23 notifies the result of the transmission path characteristic test.

Next, a case where the transmission path characteristic test apparatus 20 of the present invention is applied to a mobile communication system will be described. FIG. 17 is a diagram showing a configuration in a case where the transmission path characteristic test device 20 is applied to a mobile communication system.

The MSC 200 connects to the BS 120. Further, the MSC 200 controls the BCE 21 that controls the BS 120.
Connect to 0. It is assumed that the BS 120 is a newly added / relocated BS.

Next, a description will be given of a processing procedure up to the confirmation of transmission line restoration. Here, BS120 is newly added.
Assume that it is a relocated BS. [S50] The BCE 210 constantly performs a health check for monitoring the transmission path. The health check is a check performed on a newly added / relocated BS, and mainly performs a check on transmission / reception of test data after synchronization is established. [S51] If the health check becomes normal, the BCE 210 sends a system failure level 2 report to the MSC 200.
Notify to The system failure level 2 report is a transmission line restoration event of a newly added / relocated BS.

Next, the internal configuration of MSC 200 and BCE 210 will be described. FIG. 18 shows MSC200 and BCE2.
FIG. 10 is a diagram showing an internal configuration of the apparatus 10. Transmission path restoration confirmation means 2
1 performs a health check and confirms the restoration of the transmission line of the newly laid transmission line. Then, after confirming the restoration of the transmission path, the MSC 200 is notified of the system failure level 2 report.

The transmission line characteristic test execution means 22 receives the report of the system failure level 2 and automatically performs a transmission line characteristic test on the newly laid transmission line. Result notification means 23
Notifies the result of the transmission path characteristic test through the maintenance terminal 30.

As described above, the transmission line characteristic test apparatus 20 of the present invention automatically sets the target BS when the BS is added or relocated.
And a transmission path characteristic test is performed. As a result, the time for checking the normality of the added or relocated transmission path can be reduced, and a highly efficient transmission path characteristic test can be performed.

[0097]

As described above, the transmission path characteristic test apparatus of the present invention calculates the transmission path characteristic value from the communication control information and the failure information that the communication control has failed, and based on this transmission path characteristic value. The configuration is such that a transmission line characteristic test is performed on the transmission line to be tested. As a result, the presence / absence of a transmission path failure can be detected at an early stage without performing a characteristic test on all transmission paths, and a highly efficient transmission path characteristic test can be performed.

Further, the transmission line characteristic test apparatus of the present invention is configured to perform a transmission line characteristic test on a newly laid transmission line after confirming the restoration of the transmission line. As a result, the transmission line characteristic test of the added or relocated transmission line can be automatically performed, so that the work time for normality check and the like can be shortened, and a highly efficient transmission line characteristic test can be performed.

[Brief description of the drawings]

FIG. 1 is a principle diagram of a transmission line characteristic testing apparatus according to the present invention.

FIG. 2 is a flowchart showing an operation procedure of the transmission path characteristic testing device of the present invention.

FIG. 3 is a diagram illustrating a flow of information collection according to the first embodiment.

FIG. 4 is a diagram showing an internal configuration of an MSC according to a first modification.

FIG. 5 is a diagram illustrating an internal configuration of an MSC and a BCE according to a second modification.

FIG. 6 is a diagram illustrating an internal configuration of an MSC and a BCE according to a third modification.

FIG. 7 is a diagram illustrating a flow of information collection according to the second embodiment.

FIG. 8 is a diagram illustrating an internal configuration of an MSC according to a first modification.

FIG. 9 is a diagram illustrating an internal configuration of an MSC and a BCE according to a second modification.

FIG. 10 is a diagram illustrating an internal configuration of an MSC and a BCE according to a third modification.

FIG. 11 is a diagram illustrating a flow of information collection according to the third embodiment.

FIG. 12 is a diagram illustrating an internal configuration of an MSC according to a first modification.

FIG. 13 is a diagram illustrating an internal configuration of an MSC and a BCE according to a second modification.

FIG. 14 is a diagram illustrating an internal configuration of an MSC and a BCE according to a third modification.

FIG. 15 is a diagram illustrating the principle of a transmission line characteristic test apparatus according to the present invention.

FIG. 16 is a flowchart showing an operation procedure of the transmission path characteristic testing device of the present invention.

FIG. 17 is a diagram showing a configuration in a case where a transmission path characteristic test apparatus is applied to a mobile communication system.

FIG. 18 is a diagram showing an internal configuration of MSC and BCE.

FIG. 19 is a diagram illustrating an outline of a transmission path characteristic test in a mobile communication system.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 communication control information 2 failure information 10 transmission line characteristic test device 11 information collection unit 12 transmission line characteristic value calculation unit 13 test target determination unit 14 transmission line characteristic test execution unit 15 result notification unit 30 maintenance terminal 31 maintainer

Claims (13)

[Claims] 1. A transmission line characteristic test device for determining a transmission line to be tested for transmission line characteristics and performing a transmission line characteristic test, comprising: a communication control unit for performing communication control between a plurality of devices on the transmission line. Information collecting means for collecting information and failure information that failed in the communication control; and a transmission line characteristic value for calculating a transmission line characteristic value of the transmission line from the collected communication control information and the failure information. Calculating means, determining the state of the transmission path based on the transmission path characteristic value, and determining the transmission path having an abnormal determination result as the test target; andtesting the transmission as the test target. A transmission line characteristic test device, comprising: a transmission line characteristic test execution unit that performs the transmission line characteristic test on a path; and a result notification unit that notifies a result of the transmission line characteristic test. 2. The transmission path characteristic test apparatus according to claim 1, wherein said transmission path characteristic value calculation means is activated at a constant period. 3. The transmission line characteristic test according to claim 1, wherein the plurality of devices on the transmission line are a mobile switching center, a base station, a base station control device, and a mobile station. apparatus. 4. The transmission path characteristic test apparatus according to claim 3, wherein said transmission path characteristic test apparatus is located inside said mobile switching center. 5. The information collection unit is located inside the base station control device, and the transmission line characteristic value calculation unit, the test target determination unit, the transmission line characteristic test execution unit, and the result notification unit, 4. The transmission path characteristic test apparatus according to claim 3, wherein the transmission path characteristic test apparatus is provided inside the mobile switching center. 6. The information collection unit, the transmission line characteristic value calculation unit, and the test target determination unit are inside the base station control device, and the transmission line characteristic test execution unit and the result notification unit are 4. The transmission path characteristic test apparatus according to claim 3, wherein said transmission path characteristic test apparatus is provided inside said mobile switching center. 7. The information collecting means includes: a total number of outgoing / incoming calls from the mobile device as the communication control information; a base station factor disconnection number of calls caused by the base station as the failure information;
4. The transmission path characteristic test apparatus according to claim 3, wherein the transmission path characteristic is collected. 8. The transmission path characteristic value calculating means calculates a blocking loss rate as the transmission path characteristic value from the total number of outgoing / incoming calls and the number of base station factor disconnected calls. The transmission line characteristic test apparatus according to the above. 9. The information collection means collects, as the communication control information, a total number of location registrations from the mobile station, and as the failure information, a base station factor location registration failure number caused by the base station. The transmission path characteristic testing apparatus according to claim 3, wherein: 10. The transmission path characteristic value calculation means calculates a position registration failure rate as the transmission path characteristic value from the total number of position registrations and the number of base station factor position registration failures. A transmission path characteristic test apparatus according to claim 9. 11. The information collection means includes: a total number of channel switching requests from the mobile device as the communication control information;
4. The transmission path characteristic test apparatus according to claim 3, wherein the failure information includes a base station-caused channel switching failure number caused by the base station. 12. The transmission path characteristic value calculating means calculates a channel switching failure rate as the transmission path characteristic value from the total number of channel switching requests and the number of base station-caused channel switching failures. The transmission line characteristic test apparatus according to claim 11, wherein 13. A transmission path characteristic test apparatus for determining a transmission path to be tested for transmission path characteristics and performing a transmission path characteristic test, wherein the transmission path for confirming the transmission path restoration of the newly laid transmission path. Restoration confirmation means, transmission path characteristic test execution means for performing the transmission path characteristic test on the transmission path after confirming the transmission path restoration, and result notification means for notifying a result of the transmission path characteristic test. A transmission line characteristic test apparatus characterized by the above-mentioned.