JPH08256120A - Fault search control method and fault search control system - Google Patents

Abstract

(57) [Abstract] [Purpose] Regarding a failure search control method and a failure search control system in a mobile communication system, it is automatically judged whether or not there is a failure. [Configuration] Mobile terminal (MS) 1 and base station (BTS) 2
In a system including a switching center 3 and a monitoring station 4, a call control alarm of the monitoring station 4 for a call processing alarm due to a squelch disconnection in wireless communication between the mobile terminal 1 and the base station 2 ( OMC) 11 and collects the call processing alarms in the storage unit 15 of the data management center (DMC) 13 and searches the collected call processing alarms by the failure determination unit 14 to determine the number of call processing alarms within a certain period. Is compared with a threshold value, and when the number of call processing alarms exceeds the threshold value, it is determined that a failure has occurred at the location causing the call processing alarm. Further, a bit error rate measurement test is carried out based on the failure judgment to confirm the occurrence of the failure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a failure search control method and a failure search control system for automatically searching for a failure in a mobile communication system using a mobile terminal such as a car phone or a mobile phone. 2. Description of the Related Art In a mobile communication system in which a mobile terminal such as a car phone or a mobile phone and a base station are wirelessly communicated, the line may be disconnected during communication. For example, when moving to a building or a tunnel, the squelch is cut off due to a decrease in reception level, or there is a case where a trouble occurs in a transmitting / receiving device of a mobile terminal or a base station. In the former case, it is not an obstacle, but in the latter case, it is an obstacle, so early detection is desired.

[0002]

2. Description of the Related Art FIG. 25 is an explanatory diagram of a mobile communication system, and 101 is a mobile terminal (M
S), 102 is a base station (BTS), and 103 is a switching center:
Reference numeral 04 is a monitoring station, 105 is a charge center, 106 is a transmission / reception device (TRX), 107 is a control unit, 108 is a test terminal (TTR), 109 is a base station control device (BCE), 11
0 is an exchange (MSC), 111 is a supervisory controller (OM)
C), 112 is a base station supervisory controller (BCWS), 11
3 is a data management center (DMC).

A plurality of distributed base stations 102 are connected to the exchange 103, and the base station controller 1 of the exchange 103 is connected.
The base station 102 is controlled via 09. Base station 102
Is provided with a plurality of transmission / reception devices 106 for frequency correspondence and the like, a test terminal 108, and a control unit 107 for controlling each unit. The switching center 103 also includes the monitoring station 104 and the charge center 1.
05 and other general subscribers not shown and the exchange 110
, And exchange control between mobile terminals and between mobile terminals and general subscribers is performed.

The monitor station 104 has a monitor controller 111, a base station monitor controller 112, and a data management center 113, and receives signal levels during wireless communication between the mobile terminal 101 and the base station 102. A call processing alarm such as a squelch disconnection due to a decrease in the communication rate is collected via the exchange 103. Further, the charge center 105 performs charging processing according to, for example, a call time and a call distance corresponding to the mobile terminal 101.

When the mobile terminal 101 originates or receives a call to the mobile terminal 101, the base station controller 109
The use frequency is specified by the base station 102, and the base station 102 controls the transmission / reception device 106 corresponding to the specified frequency to the control unit 10.
Wireless communication between the mobile terminal 101 and the base station 102. When the squelch disconnection occurs due to a decrease in the reception level or the like, the base station 102 sends a squelch disconnection signal to the base station control device 109. Base station control device 1
09 is converted into a signal processing call processing alarm according to the interface of the exchange 110 and transmitted.

This call processing alarm is transferred to the data management center 113 via the monitor control device 111 of the monitor station 104. Further, the monitor control device 111 has functions of monitoring the state of each part of the base station 102, control such as remote reset for initialization, and sending a test command such as a bit error rate measurement viewpoint of a wireless line system, and functions as a terminal part. The base station monitoring controller 112 has a function of inputting monitoring and control of the base station.

In this monitoring station 104, an operator is usually resident, and the mobile terminal number, base station number, transmission / reception device number, sector number, disconnection reason, etc. due to the collected call processing alarms are recorded. Can be displayed. In addition, when the operator inputs commands as necessary, performs statistical processing of the collected call processing alarms, etc., and the call processing alarms are concentrated on a specific mobile terminal or base station transceiver device. It is possible to determine that a failure has occurred in the particular mobile terminal or transceiver.

[0008]

In the conventional mobile communication system, the monitoring station 104 collects call processing alarms, but the operator performs statistical processing of the collected call processing alarms by command input. Therefore, when the failure occurrence can be identified, and if the squelch is often cut due to deterioration of parts of the mobile terminal, there is a problem that it takes a long time to recognize the failure occurrence unless the mobile terminal requests. In addition, even if a specific transmission / reception device among a plurality of transmission / reception devices 106 in the base station 102 is deteriorated, the squelch is cut off due to the decrease in the reception level, and the failure occurs unless the call processing alarm statistical processing is performed. Cannot be identified, so there is a problem of reduced service. It is an object of the present invention to search collected call processing alerts and automatically identify whether a failure has occurred.

[0009]

A fault search control method and a fault search control system of the present invention will be described with reference to FIG. 1. (1) The fault search control method is wirelessly communicated with a mobile terminal 1. A base station 2 that communicates with the exchange 3
In a mobile communication system having a monitoring station 4 connected via a switch, a call processing alarm in wireless communication between the mobile terminal 1 and the base station 2 is sent to the monitoring station 4 via the switching center 3. Collected at this time, searching for the collected call processing alerts and thresholds,
It includes a process of comparing the collected call processing alarms within a certain period with a threshold value, and determining that a failure has occurred at the occurrence point of the call processing alarms when the number of collected call processing alarms exceeds the threshold value.

(2) Further, the collected call processing alarms are searched for the transmitter / receiver of the base station 2, and the number of collected call processing alarms corresponding to the transmitter / receiver within a certain period is compared with a threshold value. The process may include a step of determining that the transmitting / receiving device has a failure when the value exceeds.

(3) Also, the number of collected call processing alarms is searched for the mobile terminal, and the number of collected processing alarms corresponding to the mobile terminal within a certain period is compared with a threshold, and the number of collected call processing alarms exceeds the threshold. Sometimes, a process of determining a failure of the mobile terminal can be included.

(4) Further, the number of collected call processing alarms is retrieved corresponding to the mobile terminal and the frequency, and the number of collected call processing alarms corresponding to the mobile terminal and the frequency within a certain period is compared with a threshold.
When the number of collected call processing alarms exceeds a threshold value, a process of determining a failure at a specific frequency of the mobile terminal may be included.

(5) In addition, a base station 2 that performs wireless communication with the mobile terminal 1, a monitoring station 4 that connects the base station 2 via a switching center 3, and a charge center that includes a billing computer 16. In the mobile communication system having the above-mentioned 5, the call processing alarm in the wireless communication between the mobile terminal 1 and the base station 2 is collected in the monitoring station 4 via the exchange 3 and A call frequency history is collected by the billing computer 16 at the time of occurrence of a processing alarm, the collected call processing alarm is searched for to obtain the probability of occurrence of the call processing alarm, and the probability of occurrence is compared with a predetermined threshold value, and the probability of occurrence is predetermined. When the threshold value is exceeded, the process includes the process of determining that the call processing alarm has failed.

(6) Also, based on the collected call processing alarm within a certain period and the call time by the billing computer 16, the number of times of call disconnection within a certain time is searched for and calculated, and this number is compared with a threshold value. When the number of times exceeds the threshold value, it is possible to include a process of determining that the call processing alarm has failed.

(7) It may also include a step of searching for other call processing alerts except the call processing alert accompanied by the battery exhaustion information of the mobile terminal 1 to determine whether or not a failure has occurred.

(8) Further, the call time from the billing computer 16 when the call processing alarm is issued is compared with a fixed time, and when the call time exceeds the fixed time, it is estimated that the battery of the mobile terminal 1 is dead. It is possible to include a process of searching for other call processing alarms other than the call processing alarm when it is estimated that the battery is dead and determining whether or not a failure has occurred.

(9) Further, when call processing alarms of the same frequency or adjacent frequencies are collected at the same time or almost at the same time, it is determined that the call processing alarms are caused by radio wave interference, and other call processings are excluded except for this call processing alarm. A step of searching for an alarm and determining whether a failure has occurred can be included.

(10) When the monitoring station 4 determines that a failure has occurred by the search and determination processing of the collected call processing alarm, the switching station 3
The transmission / reception device 6 of the base station 2 may be designated to perform a bit error rate measurement test via the, and a process of testing whether the transmission / reception device 6 is normal or abnormal can be included.

(11) The bit error rate measurement test can be performed by the transmitter / receiver 6 of the base station 2 and the loopback function of the test terminal 8 of the base station 2.

(12) Also, the bit error rate measurement test can be performed by the transmitting / receiving device 6 of the base station 2 and the loopback function of the designated mobile terminal 1.

(13) Further, the bit error rate measurement test can be performed by using the bit error rate measuring unit provided in the mobile terminal 1 designated by the base station 2.

(14) It also includes the step of canceling the bit error rate measurement test when the mobile terminal 1 performs an input operation including a call during the bit error rate measurement test and an incoming call is made to the mobile terminal 1. You can

(15) It may also include a step of stopping the bit error rate measurement test when the reception level from the mobile terminal 1 during the bit error rate measurement test falls below a threshold value.

(16) Further, the monitoring station 4 controls the base station 2 to send fault information to the mobile terminal which is determined to have a fault by the search for the collected call processing alarm and the bit error rate measurement test. You can

(17) Further, the monitoring station 4 notifies the mobile terminal 1 of the frequency determined to have a failure by the search for the collected call processing alarm and the bit error rate measurement test, and the failure occurs in the mobile terminal 1. The frequency is stored, and when the base station 2 assigns this fault occurrence frequency, the mobile terminal 1
Can send rejection information.

(18) Further, the monitoring station 4 uses the failure occurrence frequency as the subscriber information of the home location register in the switching center 3 with respect to the frequency determined as the failure occurrence by the search of the collected call processing alarm and the bit error rate measurement test. It is possible to control the allocation of frequency to the mobile terminal 1 by referring to the home location register by additionally storing the prohibition information.

(19) Further, the fault search control system has a base station 2 which performs wireless communication with the mobile terminal 1, and a monitoring station 4 which connects the base station 2 through the exchange 3. The monitoring station 4 includes a data management center 13 including a signal processing control unit 17, a failure determination unit 14, and a storage unit 15, and a monitoring control device 11 including a base station monitoring control device 12, and the failure determination unit 14 includes , The call control alarms collected by the monitoring control device 11 via the exchange 3 and accumulated in the storage unit 15 are searched, and when the number of call process alarms within a certain period exceeds a threshold value, the call process alarms are generated. It has a configuration for determining that a failure has occurred.

(20) Further, the fault search control system comprises a base station 2 which performs wireless communication with the mobile terminal 1, a monitoring station 4 which connects the base station 2 through an exchange 3, and a billing computer. And a charge center 5 including 16 and a monitoring station 4
Is a signal processing control unit 17, a failure determination unit 14, and a storage unit 15.
And a data management center 13 including a base station monitoring control unit 1
2 and a failure control unit 11
Is collected by the supervisory control device 11 via the exchange 3,
The call processing alarm accumulated in the storage unit 15 is searched, and the call information such as the number of calls and the call time from the billing computer 16 is collected, and it is determined whether a failure occurs based on the call processing alarm and the call information. It has a configuration.

(21) Further, the exchange 3 is instructed by the base station controller 9 for controlling the base station 2 and the monitor station 4
It is provided with a bit error rate measurement unit that performs a bit error rate measurement test via the base station 2.

(22) Also, the mobile terminal 1 may include a bit error rate measuring unit for performing a bit error rate measurement test according to a command from the base station 2.

[0031]

[Action]

(1) The fault search control method collects a call processing alarm due to disconnection of squelch in the wireless communication between the mobile terminal 1 and the base station 2 by the monitoring station 4 via the exchange 3, and collects this. Search for call processing alerts. Then, when the collected call processing alarms frequently occur within a certain period so as to exceed the threshold value, it is determined that the point generating the call processing alarm is a failure.
That is, the squelch disconnection in normal wireless communication occurs when moving to a location where the electric field strength is extremely reduced within the same base station 2 service area. Since there is almost no repeated movement from a place where the electric field strength is high, it is determined that a failure has occurred in the mobile terminal 1 or the base station 2 in which call processing alarms frequently occur.

(2) In the above (2) to (4),
The failure determination unit 14 of the monitoring station 4 searches for the collected call processing alarm corresponding to the transmission / reception device of the base station 2, the mobile terminal, or the mobile terminal and the frequency. If the number of collected call processing alarms within a certain period exceeds the threshold value, it is determined that a failure has occurred.

(3) In the above (5), the billing computer 16 of the charge center 5 holds the call history such as the call time and the number of calls, and the failure judging section 1 of the monitoring station 4
4 searches the storage unit 15 in which the collected call processing alarm is accumulated,
Further, the history of the number of calls when the call processing alarm is issued is collected from the billing computer 16 and the probability of occurrence of the call processing alarm per the number of calls is calculated. The high occurrence probability indicates that the failure probability is high. Therefore, when the occurrence probability exceeds a predetermined threshold value, it is determined that the place where the call processing alarm is generated is the failure.

(4) Further, in the above (6), the collected call processing alarm within a certain period is searched, and the billing computer 1
The call time when the call processing alarm is generated from 6 is collected, and the number of times the call processing alarm is generated when a certain time has elapsed from the start of the call is calculated. For example, the normal characteristics are maintained at the beginning of a call, but the characteristics may deteriorate due to deterioration of parts with the passage of time from the start of the call, and the call may be disconnected. Therefore, it is determined that a failure has occurred if the number of times the call is disconnected within a fixed time is large.

(5) In the above (7) and (8),
If the voltage drops due to the discharge of the battery, which is the power source of the mobile terminal 1, the call cannot be continued. In that case, the call is disconnected. When the mobile terminal 1 has a function of sending out the battery dead information in the case of the battery dead, the monitoring station 4 determines that the call processing alarm accompanied by the battery dead information is not due to the failure occurrence, and therefore the failure occurrence determination is made. Ignore when searching for. Also, there is a high possibility that the battery will run out even in the case of a call for a long time. Therefore, the call processing alarm when the call time is long is regarded as running out of battery, and as in the case described above, Ignore when searching to determine the failure.

(6) Further, in the above (9), depending on the propagation state of radio waves, radio waves of the same frequency may be received from other base stations. Therefore, when the monitoring station 4 collects the call processing alarms with the same frequency or the adjacent frequency at the same time or almost at the same time due to the processing speed delay or the like, the monitoring station 4 considers that they are not the call processing alarms due to the occurrence of a failure, and determines the failure occurrence. Ignore when searching for.

(7) Further, in the above (10) to (13), when it is determined that a failure has occurred by the search and determination processing of the collected call processing alarm of the monitoring station 4, the bit error rate measurement test is executed. In that case, the transceiver device 6 of the base station 2
Is specified and the return function of the test terminal 8 of the base station 2 is used to determine the presence / absence of a failure of the transceiver device 6,
Further, by designating the mobile terminal 1 and operating the loopback function of the mobile terminal 1, it is possible to determine the presence / absence of a failure including the transmission / reception device 6 of the base station 2 and the mobile terminal 1. Further, by activating the bit error rate measuring unit provided in the mobile terminal 1, the bit error rate between the mobile terminal 1 and the transceiver 6 of the base station 2 can be measured. If the bit error rate has deteriorated below a predetermined threshold value, it can be reliably determined that there is a failure.

(8) Also, in the above (14) and (15), while the bit error rate between the mobile terminal 1 and the transceiver 6 of the base station 2 is being measured, the mobile terminal 1 receives an incoming call. If so, the bit error rate measurement test is stopped and the incoming call process to the mobile terminal 1 is performed. Also, when a call is made by pressing various buttons of the mobile terminal 1 or other input operation is performed, the bit error rate measurement test is stopped to prevent service deterioration. If the reception level drops below the threshold, the bit error rate measurement will be inaccurate.
Also in this case, the bit error rate measurement is stopped.

(9) In the above (16) to (18), when the monitoring station 4 confirms the occurrence of a failure as a result of the collected call processing alarm search and the bit error rate measurement test, it moves to the failure occurrence. The terminal is called and the occurrence of a failure is notified by a message that can be displayed on the display unit or a voice from a talkie trunk. Further, in the case of a failure of a transmitting / receiving unit or the like of a specific frequency, the mobile terminal 1 is notified of the frequency of the failure and stored, and when the frequency of the failure is assigned from the base station 2, the rejection information is transmitted and the base station 2 Will perform the process of assigning another frequency. Further, by adding the prohibition frequency prohibition information to the home location register of the exchange 3 and storing it, the base station 2 can be controlled not to use the failure occurrence frequency.

(10) In the fault search control system according to (19), when the base station 2 receives a squelch disconnection signal to the exchange 3 when the reception level of the mobile terminal 1 is lowered, the exchange is performed. The station 3 sends the call processing alarm to the monitoring station 4. The monitoring controller 11 of the monitoring station 4 collects the call processing alarms via the switching center 3 and stores the collected call processing alarms in the storage unit 15 under the control of the signal processing controller 17 of the data management center 13. The failure determination unit 14 searches the storage unit 15, compares the number of call processing alarms within a certain period with the threshold corresponding to the occurrence location of the call processing alarm, and when the threshold is exceeded,
Since many call processing alerts occur, it is determined that a failure has occurred.

(11) In the above (20), the collected call processing alarm is accumulated in the storage unit 15 of the data management center 13 of the monitoring station 4, and the failure judgment unit 14 searches the storage unit 15.
Further, since the billing computer 16 of the charge center 5 records the call date and time corresponding to the mobile terminal 1, the call information such as the number of calls for which a call processing alarm is generated and the call time obtained by the search is obtained. A failure occurs if the probability of occurrence of a call processing alarm is high or the number of times a call processing alarm is issued is high, based on the number of call processing alarms within the specified time from the start of a call to the disconnection of a call. To determine.

(12) In the above (21) and (22), a bit error rate measuring unit is provided in the exchange 3,
A bit error rate measurement test is performed according to a command from the monitoring station 4, or a bit error rate measuring unit is provided in the mobile terminal 1 and the bit error rate is measured according to a command via the base station 2 to generate a failure. Can be confirmed.

[0043]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory diagram of a system according to an embodiment of the present invention, in which 1 is a mobile terminal (MS) and 2 is a base station (BT).
S) 3 is a switching station, 4 is a monitoring station, 5 is a charge center, 6 is a transceiver (TRX), 7 is a control unit, 8 is a test terminal (TTR), and 9 is a base station controller (BCE). 10 is an exchange (MSC), 11 is a supervisory controller (OMC), 12
Is a base station monitoring controller (BCWS), 13 is a data management center (DMC), 14 is a failure determination unit, 15 is a storage unit,
Reference numeral 16 is a charging computer, and 17 is a signal processing control unit.

The base station 2 has a configuration including a plurality of transmitting / receiving devices 6, a control unit 7 for controlling each unit, and a test terminal 8, and the control unit indicates that the reception level of the mobile terminal 1 has dropped. When 7 identifies, the squelch disconnection signal is sent to the exchange 3. The exchange 3 has a base station controller 9 for controlling the base station 2.
And a switch 10 including a call switch, and the base station controller 9 converts the squelch disconnection signal into a signal suitable for the interface of the switch 10 and sends it as a call processing alarm to the monitoring station 4 via the switch 10. To do. The monitoring station 4 includes a monitoring control device 11 and a data management center 13, and the monitoring control device 11 uses the base station monitoring control device 12 as a terminal unit.
Further, the data management center 13 includes the failure determination unit 14 and the storage unit 1.
5 and a signal processing control unit 17, and the switching center 3
The call processing alarm is transferred to the data management center 13 via the monitor control device 11 and stored in the storage unit 15 under the control of the signal processing control unit 17.

FIG. 2 is an explanatory diagram of the monitoring station. The monitoring control device 11 includes a base station monitoring control unit 12, a control unit 21, and a monitoring control unit 22, and the data management center 13 includes a failure determination unit 14. It has a configuration including a storage unit 15, a signal processing control unit 17, an alarm display unit 18, a monitor unit 19, and an input operation unit 20, is connected to the control unit 21 and the exchange 10, and has a signal processing control unit 17 and a billing computer 16. Connected with.

The call processing alarm transferred to the supervisory control unit 11 via the exchange 10 is processed in the signal processing control unit 17 of the data management center 13 and accumulated in the storage unit 15. In addition, the failure determination unit 14 searches the storage unit 15 periodically or upon receipt of a call processing alarm or the like, performs statistical processing of the call processing alarm, etc., and if necessary, from the charging computer 16 of the charge center 5 to the number of calls. , Acquires call information such as call time, and determines whether or not there is an obstacle in handling the location of the call processing alarm.

A bit error rate measurement test command is sent based on the result of this determination to isolate the location of failure, and the alarm display section 18 sounds a buzzer, lights a lamp or blinks. The operator is notified by an announcement or the like, and the failure occurrence information is displayed on the monitor unit 19. In addition, the confirmation test can be manually input from the base station monitoring control unit 12.

FIG. 3 is an explanatory diagram of the switching center. 9 is a base station control device, 30 is a switching unit, 31 is a control unit (C
C) and 32 are home location registers (HLR),
33 is a bit error rate measuring unit (BERTA), 34
Is a talkie trunk (TKT), 35 is a transmission device, and 36
Is a control unit, and 37 is a signal processing unit. The exchange 3 and the base station 2 are connected by a line via the transmission device 35. The switching unit 30 is controlled by the control unit 31 and performs switching connection.

The bit error rate measuring unit 33 also generates a test pattern, compares it with the test pattern returned from the test terminal 8 or the mobile terminal 1, and measures the bit error rate. Home location register 32
Stores subscriber information. Further, the talkie trunk 34 can send various talkies to the mobile terminal 1 or the like under the control of the control unit 31. Further, the base station control device 9 has a function of converting the squelch disconnection signal into a signal format suitable for the interface of the exchange under the control of the control unit 36 in the signal processing unit 37 as described above.

FIG. 4 is an explanatory view of the base station, and 41, 42
Is an antenna, 43 is an amplifier, 44 is a transmission device, 45 is a device monitoring control unit, 6 is a transmission / reception device (TRX), 7 is a control unit, and 8 is a test terminal (TTR). The amplifier 43 is a radio frequency amplifier, and the transceiver 6 is n: 1.
The present invention shows a case in which the active spare configuration of No. 1 is provided, and has a function of detecting a reception level with the mobile terminal 1. Further, the transmission / reception device in which a failure has occurred can be switched to the standby transmission / reception device under the control of the control unit 7. Also, the test terminal 8 has the same function as the mobile terminal 1 or a configuration that can be simulated.
Further, the control unit 7 monitors the reception level of the mobile terminal 1 corresponding to the transmission / reception device 6, and when the reception level falls below a predetermined threshold value, sends a squelch disconnection signal.

FIG. 5 is an explanatory view of a mobile terminal, in which 51 is an antenna, 52 is a radio transmitting / receiving unit, 53 is a control unit, 54 is a voice processing unit, 55 is a terminal unit, 56 is a memory, and 57 is a battery checking unit. , 58 is a folding unit, 59 is a decryption processing unit, 60
Is an encoding processing unit, 61 is a speaker, 62 is a microphone, 63 is a display unit such as a liquid crystal display unit, and 64 is an input operation unit including a numeric keypad, an off-hook button, and the like.

The radio transmission / reception unit 52 performs radio communication with the base station 2, and the decoding processing unit 59 performs processing of decoding a received signal and converting it into an analog voice signal. The encoding processing unit 60 also converts the analog audio signal into a digital signal and encodes the digital signal. In addition, the battery check unit 57 checks the battery of the power source of the mobile terminal 1, and when the battery voltage drops below a predetermined value, the control unit 53 causes a buzzer or the like (not shown) to generate an alarm sound, or during a call. In that case, it is also possible to provide a function of transmitting the battery dead information. Further, the folding unit 58 causes the control unit 53 to form a folding circuit indicated by a dotted line in response to a command for the bit error rate measurement test.

FIG. 6 is a flow chart of the primary judgment in the embodiment of the present invention, which shows the primary judgment in the failure judging section 14 of the monitoring station 4, in which the search start trigger is preset, and the call processing alarm is issued ( It is determined whether the trigger is caused by 2) or the timer is activated (3) (1), and when the call processing alarm is triggered, when the call processing alarm is received via the switching center 3, the call processing due to running out of battery or the like is performed. Except for alerts, it is activated immediately for other call processing alerts. When the timer is activated, the timer is activated at regular time intervals, for example, at a set time such as midnight.

Collected call processing alarms are accumulated in the storage unit 15. As shown in the search processing (4), ID search, TRX search, ID-frequency (group) search, and ID-call time search. Then, the number of occurrences or the probability of the call processing alarm and the threshold value are read corresponding to the number ID of the mobile terminal 1, and the number of occurrences or the probability of the call processing alarm is compared with the threshold value. Also, the transceiver device TRX of the base station 2
Correspondingly, the call processing alarm generation circuit and the threshold value are read out, and the number of occurrences and the threshold value are compared. Also, the number of times the call processing alarm is issued and the threshold value corresponding to the number ID and frequency (group) of the mobile terminal 1 are read, and the number of occurrences and the threshold value are compared. Further, the number of times the call processing alarm is generated and the threshold value are read out in correspondence with the number ID of the mobile terminal 1 and the call time, and the number of times of occurrence and the threshold value are compared.

Any one of them can be searched and compared, or a plurality of combinations can be searched and compared. In the primary judgment (5), the number or probability of occurrence of call processing alarms is set to a threshold value. When it does not exceed, it is determined to be normal, and when it exceeds, it is determined to be abnormal, and notification (6) is made to the operator of the monitoring station 4. For example, notification is given by a buzzer sounding by the alarm display unit 18, a display on the monitor unit 19, or the like. Confirmation test (7) automatically or by input from the input operation unit 20
I do. This confirmation test (7) corresponds to the secondary judgment with respect to the primary judgment.

FIG. 7 is a flowchart of the secondary judgment according to the embodiment of the present invention. In the case of the above-mentioned primary judgment abnormality (11), it is judged (12) what the abnormality is. That is, it is determined whether the ID search is abnormal, the TRX search is abnormal, the ID-frequency search is abnormal, or the ID-call time search is abnormal. If the ID is abnormal, that is, the call processing corresponding to the mobile terminal 1 within a certain period. When the number of alarms exceeds the threshold, the bit error rate measuring unit 33 of the exchange is activated and the mobile terminal 1 is designated to specify the mobile terminal (MS) return bit error rate (BER).
A measurement test is performed (13). If the TRX search is abnormal, that is, if the number of call processing alarms corresponding to the transceiver of the base station 2 within a certain period exceeds the threshold value, the test terminal (T
TR) 8 and the bit error rate measuring unit 33 of the exchange to activate the return bit error rate (BE
R) Perform measurement test (14).

When the ID-frequency search is abnormal, that is, when the number of call processing alarms corresponding to the mobile terminal and the frequency within a certain period exceeds the threshold value, the mobile terminal and the frequency are designated, As in the case described above, a measurement test of the return bit error rate (BER) of the mobile terminal (MS) is performed (1
5). If the ID-call time is abnormal, that is, if the number of call processing alarms corresponding to the mobile terminal and the call time within a certain period exceeds a threshold value, a loopback test of a time corresponding to the certain time obtained by the search process is performed. Do (16).

Secondary determination of each test result (17)
If the determination is normal, the operator of the monitoring station 4 is notified of the result (20), and if abnormal, the subscriber and the operator are notified of the abnormality (18). That is, the result of confirming the occurrence of the failure is notified to the subscriber of the mobile terminal 1 by the display on the display unit 63 or the talkie, and the operator of the monitoring station 4 is notified by the display of the monitor unit 19 or the like.

FIG. 8 is an explanatory diagram when a squelch break occurs,
In wireless communication between the mobile terminal (MS) 1 and the base station (BTS) 2, the transmitter / receiver (TRX) 6 reduces the reception level from the mobile terminal 1 such that communication becomes impossible. Upon detection, the control unit 7 controls the disconnection of the call and
Send the squelch disconnection signal. The base station controller (BCE) 9 of the exchange 3 sends this squelch disconnection signal to the exchange (MS
C) The signal is converted in accordance with the interface of 10 and the converted call processing alarm is sent through the exchange 10 to the supervisory controller (O
MC) 11. The monitoring control device 11 transfers the call processing alarm to the data management center (DMC) 13. Also, the call start time and the call end time or the call disconnection time in the exchange 10 are notified to the billing computer 16, and this call information is sent out at the request of the data management center 13.

FIG. 9 is an explanatory diagram of the storage unit of the monitoring station according to the embodiment of the present invention, showing an example of the storage unit 15 in the data management center 13 of the monitoring station 4, and the date and time of occurrence of a call processing alarm (for example, January 2, 9:10) and the terminal ID (for example,
101), base station number (eg, 30), sector (eg, 3), and transmitter / receiver number (TRX No.).
(For example, 2) and the frequency (for example, 910 [MHz])
Alternatively, the case where the frequency number), the reason for disconnection, and the talk time (for example, 10 minutes) are included is shown.

FIG. 10 is a diagram for explaining the operation of the confirmation test according to the embodiment of the present invention. In FIG. 10A, MS (TTR) is the mobile terminal 1 or test terminal 8 and BTS / BCE is the base station. / Base station controller, MSC is exchange 10, BCWS (O
MC is the base station monitoring controller 12 (monitoring controller 1)
1), DMC indicates the data management center 13.

When a call disconnection occurs as indicated by a cross mark due to a decrease in the reception level during a call, as described above, the call processing alarm is transferred to the data management center DMC via the exchange MSC. Failure determination unit 14 of data management center DMC
When the activation trigger is the reception of a call processing alarm, the storage unit 15 is searched by immediate activation to obtain the number of call processing alarms within a certain time period in the past from the reception of the call processing alarm, and the above-described primary determination is performed. If it is determined to be abnormal by the primary determination, the data management center DMC sends a test command.

The base station supervisory controller BCWS of the supervisory controller OMC sends out a test execution command. Upon receiving this test execution command, the exchange MSC activates the bit error rate measurement unit 33 and performs a loopback test according to the test execution command, and the test result is sent to the data management center DMC via the base station monitoring controller BCWS. Then, the failure determination unit 14 of the data management center DMC makes a secondary determination. If it is determined to be abnormal by this secondary determination, it means that the failure has been confirmed, and the subscriber and the operator are notified.

In (B), MS is a mobile terminal, BT
S / BCE / MSC is a base station 2 / base station controller 9 /
The exchange 10 is shown. When performing the above-mentioned bit error rate measurement test, “in-test display” is performed by paging.
When the mobile terminal MS receives the "in-test display", the mobile terminal MS displays, for example, on-display on the display unit 63 (see FIG. 5). Further, when the bit error rate measurement test is completed, an "in-test display" erase signal is sent out, so that the in-test display on the display unit 63 of the mobile terminal 1 which received this is erased.

During the bit error rate measurement test, the loopback unit 58 (see FIG. 5) is controlled by the control unit 53 of the mobile terminal 1.
As shown by the dotted line in FIG. That is, the control unit 53 recognizes that the test is in progress. Therefore, when the button press of the input operation unit 64 of the mobile terminal 1 is detected, it is determined that the mobile terminal 1 is used and the disconnection signal is issued. Is sent. As a result, the base station / base station controller / switch ends the test. When this test is completed, the mobile terminal 1 is in a normal usable state.

FIG. 11 is an explanatory diagram at the time of BER measurement, in which the control unit (CC) of the exchange is operated by a test command from the monitoring station.
31 is a bit error rate measuring unit (BERTA) 33
And controls the base station controller (BCE) 9
From the base station control device 9, a test command designating a test terminal (TTR) 8 or a mobile terminal (MS) 1 to perform a loopback test is sent to the base station 2 via the transmission device 35.

The base station 2 activates the test terminal 8 in the case of the loopback test command from the test terminal 8 and activates the mobile terminal 1 in the case of the loopback test command from the mobile terminal 1. A folding circuit is formed in the folding unit 58 of the mobile terminal 1 by designating. Then, the test pattern from the bit error rate measurement unit 33 is transmitted from the transmission / reception unit 6 of the base station 2 and is returned by the test terminal 8 or the mobile terminal 1.
It is transferred to the bit error rate measurement unit 33 via the base station 2, and the bit error rate (BER) is measured by collating the transmission test pattern and the reception test pattern.

FIG. 12 is an explanatory diagram of a format at the time of BER measurement. (A) shows a downlink signal (call signal from the base station to the mobile terminal), and has bit configurations for control, call and control. As shown in (b), the control bit portion at the head includes a synchronization word, control bits and the like, and a color code, and the color code is for identifying the base station that can identify the base station even by radio wave interference. Is the code. In the call bit portion, compression-coded voice data for a normal call is inserted.

Further, (c) shows an upstream signal (call signal from the mobile terminal to the base station), which has a bit structure for control, a communication and a control like the downlink signal, and is for the first control. The bit part is, as shown in (d), a sync word, control bits, etc., a color code, and a housekeeping bit (RCH).
It includes and.

The bit error rate measuring unit 33 of the exchange 3
The test pattern from (1) is inserted into the call bit portion of the downlink signal of (a) and transmitted. The mobile terminal or the test terminal 8 receiving the loopback test command loops back the downlink signal by the loopback section to form an uplink signal. In that case, when a bit error is detected in the control bit part on the mobile terminal or the test terminal side, a housekeeping bit (RCH)
Can be used to notify the base station side. The housekeeping bit (RCH) notifies the base station side of the detection of a bit error in the control bit portion even during a normal call, but does not notify the base station controller 9 or the like.
However, when the loopback test is being performed, it is possible to switch to notify the base station control device 9 or the like. Further, the bit error rate measuring unit 33 measures the bit error rate by collating the test pattern of the returned signal with the transmitted test pattern.

The housekeeping bit (RC
The bit error rate of the control bit section according to H) and the bit error rate according to the test pattern of the call bit section measured by the bit error rate measuring section 33 are transferred to the monitoring station 4 via the control section 31 of the exchange. The failure judgment unit 14 of the data management center 13 can confirm whether or not there is a failure, and display the result including the result on the monitor unit 19 or the like.

FIG. 13 is a diagram for explaining the operation of the incoming call during the test according to the embodiment of the present invention, and shows the case where the incoming call is received during the bit error rate measurement test. If the result of the determination is abnormal, the mobile terminal MS and the base station BTS are designated and a test command is sent. The exchange MSC registers this test command in the home location register HLR, controls the base station BTS via the base station controller BCE, and switches M as described above.
A test is performed by sending a test pattern from the bit error rate measuring unit 33 of the SC.

During this test, the mobile terminal MS
When there is an incoming call, the exchange MSC refers to the home location register HLR and knows that the terminating mobile terminal MS is under test, and therefore sends a test release signal to the mobile terminal MS under test. When the mobile terminal MS under test receives the test release signal, the control unit 53 controls the loopback unit 58 to release the loopback circuit. Then, an incoming signal is transmitted from the exchange MSC, and the mobile terminal MS responds, whereby a call is made with the calling side. Therefore, it is possible to reduce the call loss rate during the test and prevent the deterioration of service to the subscribers of the mobile terminal MS.

FIG. 14 is an explanatory diagram of a mobile terminal provided with a bit error rate measuring unit. The same reference numerals as those in FIG. 5 denote the same parts, and 65 denotes a bit error rate measuring unit (BERT).
A). By providing the bit error rate measuring unit 65 in the mobile terminal 1 as in this embodiment, the bit error rate measuring unit 65 notified beforehand of the test pattern from the bit error rate measuring unit 33 of the mobile switching center 3 is provided. At that time, the bit error rate of the test pattern due to the downlink signal is measured. In this case, the control unit 53 leaves the folding unit 58 as it is, and the bit error rate measuring unit 65.
Is started, and the call bit portion of the received downlink signal is transferred to the bit error rate measuring portion 65.

Further, the test pattern from the bit error rate measuring unit 65 is sent on the call bit portion of the upstream signal. The bit error rate measuring unit 33 of the exchange 3
Since the test pattern of the bit error rate measuring unit 65 of the mobile terminal 1 is notified in advance, it is possible to measure the bit error rate of the test pattern by the upstream signal. The measurement result of the bit error rate measured by the bit error rate measuring unit 65 of the mobile terminal 1 is sent to the switching center 3 side under the control of the control unit 53 upon completion of the test. The exchange 3 uses the bit error rate measuring units 33 and 65.
The measurement result by the monitoring station 4 is controlled by the control unit 31.
Send to. In this case, since the bit error rate is measured separately for the uplink and the downlink, it is possible to isolate the failure.

Also, the test terminal 8 of the base station 2 can be provided with a bit error rate measuring unit as in the mobile terminal 1. In that case, since the bit error rate is separately measured for the downlink and the uplink between the transmitter / receiver 6 of the base station 2 and the test terminal 8, the test terminal 8 has high reliability. , The transmitter and receiver of the transceiver 6 can be tested separately.

When the reception status of a particular mobile terminal often deteriorates, only the bit error rate measuring unit 65 of the mobile terminal 1 is tested by a test command from the data management center 13 or the base station monitoring controller 12. To operate
It is also possible to place a test pattern on the call bit part of the upstream signal and send it out, measure the bit error rate in the bit error rate measuring part 33 of the switching center 3 and check if there is a fault in the mobile terminal. Is.

FIG. 15 is a diagram for explaining the operation of the test cancellation by detecting the reception level according to the embodiment of the present invention. MS in (A) and (B) is a mobile terminal, BTS is a base station, TRX is a transmitter / receiver, and BCE. Indicates a base station controller, and MSC indicates an exchange.
(A) measures the reception level during the test preparation or the test in the mobile terminal MS and measures the reception level to the base station BT.
Report to S. The reception level measurement and the notification of the measurement result in the mobile terminal MS are performed even in the normal call state, and the reception level is notified by using the housekeeping bit (RCH). Done.

The base station BTS compares the reception level of the mobile terminal MS with a threshold value, and if the reception level is less than the threshold value, the reliability of the bit error rate measurement test decreases, so a test release request is issued to the base station controller BCE. And to the exchange MSC. The test release signal for this test release request is sent to the base station B.
When the TS receives, it sends a test release signal to the mobile terminal MS.

Further, (B) detects the reception level from the mobile terminal MS under test preparation or under test by the transmitter / receiver TRX of the base station BTS, and when the reception level is less than or equal to the threshold value, as described above, bit error occurs. Since the reliability of the rate measurement test decreases, the test release request is sent to the base station controller BCE and the exchange MSC. When the base station BTS receives the test release signal for the test release request, it sends the test release signal to the mobile terminal MS.

FIG. 16 is a diagram for explaining the operation of prohibiting a specific frequency according to the embodiment of the present invention. Similar to the above, MS is a mobile terminal, BTS is a base station, BCE is a base station controller and MSC.
Indicates a switchboard, and DMC indicates a data management center. In the data management center DMC, if the failure of the part using the specific frequency is confirmed as a result of the secondary determination, the use prohibition command of the specific frequency is sent to the mobile terminal MS. The mobile terminal MS stores the prohibited frequency in the memory 56 (see FIG. 5).
). Further, when the failure of the part using the prohibited frequency is repaired, a command for canceling the prohibition of the specific frequency is sent to the mobile terminal MS. The mobile terminal MS erases the prohibited frequency stored in the memory 56 by the use prohibition cancel command.

When there is an outgoing call from the mobile terminal MS or an incoming call to the mobile terminal MS, the base station controller BCE specifies a radio channel. At this time, if the prohibited frequency is designated, the mobile terminal MS, when the prohibited frequency is stored in the memory 56, controls the control unit 53 to deny the designated wireless channel. To do.
In this case, use prohibition frequency number (XX) or the like is added to reject the designation. The base station controller BCE designates a frequency other than the prohibited frequency by rejecting the designation. Thereby, the mobile terminal MS can use the newly designated radio channel to make a call via the base station BTS and the exchange MSC.

FIG. 17 is a diagram for explaining the operation at the time of switching channels according to the embodiment of the present invention. In the data management center DMC, if a failure of a specific frequency is confirmed as a result of the secondary judgment, Similarly, the mobile terminal MS receives the prohibition command of the specific frequency and stores it in the memory 56,
When a channel switching request occurs during a call on the move,
A channel switching request signal is transmitted from the mobile terminal MS.
The base station controller BCE designates the switching destination channel according to the channel switching request signal. At this time, if the prohibited frequency is specified, the mobile terminal MS
When the prohibited frequency is stored in the memory 56, the control unit 53 controls the channel designation of the designated switching destination to be rejected by adding the prohibited frequency number and the like. The base station controller BCE specifies a frequency other than the prohibited frequency. Thereby, the mobile terminal MS
Can switch to the newly designated wireless channel and continue the call.

FIG. 18 is a diagram for explaining the operation of the frequency allocation processing according to the embodiment of the present invention. In the data management center DMC, when the failure of the specific frequency is confirmed as a result of the secondary judgment, the specific frequency is confirmed. The use prohibition command of is sent to the exchange MSC. The exchange MSC stores the prohibited frequency number in the home location register HLR. Then, when the mobile terminal MS receives an incoming call or the mobile terminal MS sends an outgoing call, the exchange MS makes the base station controller BCE.
Then, the prohibited frequency information stored in the home location register HLR is transmitted. Base station controller BC
E is for allocating frequencies other than the prohibited frequencies,
A frequency other than the prohibited frequency is allocated between the mobile terminal MS and the base station BTS for communication.

FIG. 19 is an explanatory view of a failure display. When a failure is confirmed as a result of the primary judgment and the secondary judgment in the monitor station 4, for example, the monitor station 4 causes the control section (CC) 31 to display. The talkie transmission command is transferred, the control unit 31 activates the talkie trunk (TKT) 34 in accordance with the talkie transmission command,
In addition, the switching unit 30 is controlled to send out an announcement indicating the failure content from the talkie trunk (TKT) 34 to the base station 2 via the transmission device 35, and the transmission / reception device (TRX) 6 of the base station 2 transmits the mobile terminal. Machine (MS) 1.

For example, when a failure of a particular mobile terminal is confirmed, the mobile terminal can be designated to notify the occurrence of the failure. Such control can be entirely automated, and the mobile terminal that has not recognized the occurrence of the failure can be notified of the occurrence of the failure, so that the service can be improved.

Further, since the mobile terminal 1 is provided with the display unit 63, when the occurrence of a fault in the monitoring station 4 is confirmed, the fault display command is transferred to the control unit 31, and the control unit 31 causes the fault. A display message is created and sent to the base station 2 via the transmission device 35. This failure display message is sent from the transmitting / receiving device 6 of the base station 2 by designating the mobile terminal. The designated mobile terminal receives the failure indication message,
It is displayed on the display unit 63. Thereby, the occurrence of the failure can be recognized.

FIG. 20 is a diagram for explaining a notification signal format to a mobile terminal, (a) shows a downlink control channel,
P-CH indicates a paging channel (paging signal). As shown in (b), this paging channel P-CH includes a mobile terminal number and failure information, and can notify a mobile terminal in which a failure has occurred, including details of the failure. Further, (c) is a downlink control channel, and the paging channel P-CH thereof, as shown in (d), includes a mobile terminal number and frequency prohibition information, and is used when a specific frequency is prohibited. , It is possible to notify the mobile terminal of the prohibited frequency.

FIG. 21 is a diagram for explaining the operation of running out of battery during a call according to the embodiment of the present invention. FIG. 21A shows that the battery runs out while the mobile terminal MS is in a call via the base station BTS and the exchange MSC. In other words, that is, the battery check unit 5 of the mobile terminal MS
7 (see FIG. 5), when it is detected that the voltage of the battery of the power source has dropped to a predetermined value or less, a battery dead signal is sent to the control unit 5
It is transmitted under the control of 3. The base station BTS and the base station control device BCE confirm the reception of the battery dead signal and, based on the occurrence of the squelch disconnection, send a call processing alarm to which the battery dead information is added to the data management center DMC of the monitoring station. In this case, since the battery is dead, it is determined that there is no fault, and the data management center DMC ignores the call processing alarm to which the battery dead information is added when searching for the fault. It is a thing.

In (B), the mobile terminal MS is connected to the base station BT.
S, when the battery runs out during the call via the exchange MSC, as in the case described above, in the configuration in which the mobile terminal MS does not send out the battery dead information, the base station BTS disconnects the squelch (call Then, a call processing alarm is sent from the base station controller BCE to the data management center DMC. The exchange MSC makes a call time request to the billing computer by disconnecting the call, and the billing computer notifies the call time. At the data management center DMC, if the call time exceeds a certain time, for example, 30 minutes, the It is estimated that the battery has run out due to the continuation of the call for a certain period of time, and it is treated in the same manner as the call processing alarm to which the dead battery information is added. As a result, the search can be performed separately from the call processing alarm due to the actual failure, so that the accuracy of confirmation of the failure occurrence is improved.

FIG. 22 is a diagram for explaining the test operation of the transmitter / receiver according to the embodiment of the present invention. FIG. 22A shows the exchange MS when the transmitter / receiver TRX is judged to be abnormal in the above-mentioned primary judgment.
The bit error rate measuring unit 33 of C allows the base station BT
The bit error rate is measured by the loopback test using the S and the test terminal TTR, and the test result is used as the exchange MS.
The C notifies the data management center DMC. When the data management center DMC determines the test result and determines that the test result is abnormal, the data management center DMC informs the base station monitoring controller BCWS of the transmitting / receiving device TRX.
Reset, and send the bit error rate measurement test command.

The base station monitoring controller BCWS is
When the transmitter / receiver TRX of the TS is reset to the initial state and the reset completion signal is received, the test command is issued to the exchange MS.
Send to C. The exchange MSC activates the bit error rate measuring unit 33 again, specifies the test terminal device TTR to form a loopback circuit, and loops back the downlink signal from the base station BTS by the test terminal device TTR to obtain an uplink signal. To do.

The bit error rate measuring unit 33 of the exchange MSC measures the bit error rate by collating the transmission test pattern and the reception test pattern, and the measurement result is sent to the data management center DMC via the base station monitoring controller BCWS. Send out. The data management center DMC confirms whether or not a failure has occurred based on this measurement result. When the occurrence of a failure is confirmed, the operator is notified and the transceiver device TRX is replaced or switched to the standby transceiver device, and the operation of the base station BTS is continued.

Further, (B) shows the case of instructing the transmission / reception apparatus TRX to perform frequency switching. As in the case of (A), the result of the bit error rate measurement test in the exchange MSC is notified to the data management center DMC. However, if the test result indicates an abnormality, the data management center DMC determines that the transceiver TR
Send X reset and bit error rate measurement test command. The base station monitoring control device BCWS instructs the frequency switching of the designated transmitting / receiving device TRX.

The transmission / reception device TRX of the base station BTS performs frequency switching, and notifies the completion of the switching from the base station BTS via the base station control device BCE to the base station monitoring control device BCW.
When sent to S, the base station monitoring controller BCWS sends a test command of the bit error rate measurement signal to the exchange MSC. The exchange MSC activates the bit error rate measuring unit 33 to transmit / receive a test pattern between the transceiver device TRX that has performed frequency switching and the test terminal device TTR,
The bit error rate measuring unit 33 measures the bit error rate. The measurement result is used as the base station monitoring control device BC
It is sent to the data management center DMC via WS. Based on the measurement result, the data management center DMC confirms whether or not the frequency has been normalized by the frequency switching, and if the frequency switching causes an abnormal condition, the data management center DMC performs switching to the standby transmission / reception device.

FIG. 23 is an explanatory view of the operation when the test result of the embodiment of the present invention is defective. FIG. 23A shows the test terminal of the base station BTS which activates the bit error rate measuring unit 33 of the exchange MSC. A bit error rate measurement test is performed by turning back the machine TTR, and the test result is sent from the exchange MSC to the data management center D via the base station monitoring controller BCWS.
Notify MC. If the data management center DMC determines that the transceiver TRX is defective, it sends a request for switching the transceiver TRX.

The request for switching the transmission / reception device TRX from the data management center DMC is sent to the base station BTS via the base station monitoring control device BCWS, and the control unit 7 of the base station BTS.
Under the control of, the transmission / reception device in which the failure has occurred is switched to the standby transmission / reception device. As a result, the base station BTS can make a call with the mobile terminal in a state where all of the base stations BTS are normally restored. Further, the management information of the data management center DMC makes it possible to replace the transmitter / receiver in the base station BTS in which a failure has occurred and switch back from the spare transmitter / receiver to the replaced transmitter / receiver.

Further, (B) and (C) show the sequence in the case of the fault display described in FIGS. 19 and 20,
(B) is a bit error rate measuring unit 3 of the exchange MSC.
3, the mobile terminal MS performs a loopback test, and the result of the bit error rate measurement test is sent to the base station monitoring controller BC.
It is sent to the data management center DMC via WS, and if it is determined that the data management center DMC is abnormal, a terminal display command is sent.

In the exchange MSC, the control unit 31 receives and identifies this terminal display command, forms a paging signal (failure display), and sends it from the base station BTS to the mobile terminal MS.
The mobile terminal MS that has received this displays the failure information on its display unit 63.

Further, when the data management center DMC judges that the result of the bit error rate measurement test is abnormal, (C) sends a fault talkie sending command. Exchange MSC
Activates the talkie trunk 34 by this trouble talkie sending command, sends a call termination signal to the mobile terminal MS, and when a connection state is established via the base station BTS, the talkie trunk 34 sends a talkie for notifying the contents of the trouble. To do.

FIG. 24 is a diagram for explaining the operation of the embodiment of the present invention when a simultaneous call interruption occurs. For example, the digital car telephone system uses radio waves in the band of 50 kHz at intervals of 25 kHz by interleaving. Normally 25kH
When frequencies are used at z intervals, radio wave interference occurs, but if the base stations are sufficiently separated, radio wave interference should not occur, and effective use of frequencies can be achieved. However, radio wave interference may occur due to conditions such as the installation interval of base stations, the radiation characteristics of antennas, and the influence of surrounding buildings. Call interruption may occur due to such radio wave interference.

Therefore, the mobile terminals MS1 and MS2 in the service areas of different base stations have the same frequency or adjacent frequencies (for example, 848.025 MHz and 848.0000 M).
(Hz), a call disconnection may occur at the same time or almost at the same time, and the base station controller BCE may output a call processing alarm (a), (b). The data management center DMC having received these call processing alarms discriminates the frequencies of the base station BTS, the sector, and the transmitting / receiving device TRX according to the call processing alarms (c).

Then, at the same time or almost the same time, and the call processing alarms when the frequencies are the same or adjacent to each other, it is determined that the call is disconnected due to radio wave interference, and the data management center D
When the failure determination unit 14 of the MC searches for the collected call processing alarm, the call processing alarm determined to be the radio wave interference is ignored. Further, for example, the operator is notified of the occurrence of radio wave interference between the sector a of the base station A and the sector c of the base station B by a bell or a screen display.

The present invention is not limited to the above-mentioned respective embodiments, and combinations of the respective embodiments are also possible, and the function of the monitoring station 4 can be included in the switching center 3. . Further, the monitoring station 4 can be configured not only to monitor the mobile terminal 1 but also to perform centralized monitoring including the general switching network.

[0105]

As described above, the fault search control method of the present invention searches for collected call processing alerts and determines that a fault has occurred when the number of collected call processing alerts within a certain period exceeds a threshold value. In that case, it is possible to make a determination by including call information such as the call time when the call processing alarm is issued and the number of past calls. As a result, the failure occurrence is detected before the operation is completely stopped, and the mobile terminal 1 is detected according to the detection result.
To the transmitter / receiver 6 of the base station 2
It is possible to perform the switching control and the like. Therefore, there is an advantage that the failure can be detected early and the reliability of the mobile communication system can be improved.

Further, the failure judgment unit 14 of the data management center 13
When a failure occurrence is detected by the search of collected call processing alarms and the judgment processing by, the bit error rate measurement test is performed, and it becomes possible to confirm the failure occurrence and isolate the failure.
By notifying the failure occurrence when the failure occurrence is confirmed, it is possible to early carry out the repair processing of the failure occurrence part,
There is an advantage that the deterioration of service can be surely prevented.

Further, the fault search control system of the present invention adds a slight configuration and function to the monitor station 4 in the conventional mobile communication system, so that the mobile terminal 1 and the base station 2 are
Since it is possible to early detect and notify the occurrence of a failure in the above, there is an advantage that it can contribute to the improvement of the service of the mobile communication system.

Since the call processing alarm is excluded when the device failure of the actual mobile terminal 1 or the base station 2 such as the radio wave interference or the battery exhaustion is not excluded, the above-described failure occurrence determination is performed.
There is an advantage that it is possible to improve the accuracy of determination of failure occurrence in a mobile communication system including a complicated phenomenon.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a system according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a monitoring station.

FIG. 3 is an explanatory diagram of a switching center.

FIG. 4 is an explanatory diagram of a base station.

FIG. 5 is an explanatory diagram of a mobile terminal.

FIG. 6 is a flowchart of primary determination according to the embodiment of the present invention.

FIG. 7 is a flowchart of secondary determination according to the embodiment of this invention.

FIG. 8 is an explanatory diagram when a squelch break occurs.

FIG. 9 is an explanatory diagram of a storage unit of the monitoring station according to the embodiment of this invention.

FIG. 10 is an operation explanatory diagram of the confirmation test according to the embodiment of the present invention.

FIG. 11 is an explanatory diagram at the time of BER measurement.

FIG. 12 is an explanatory diagram of a format at the time of BER measurement.

FIG. 13 is an explanatory diagram of the operation of an incoming call during a test according to the embodiment of this invention.

FIG. 14 is an explanatory diagram of a mobile terminal including a bit error rate measuring unit.

FIG. 15 is an explanatory diagram of an operation of stopping a test by detecting a reception level according to the embodiment of this invention.

FIG. 16 is an explanatory diagram of an operation of prohibiting a specific frequency according to the embodiment of this invention.

FIG. 17 is an explanatory diagram of an operation when switching channels according to the embodiment of this invention.

FIG. 18 is an operation explanatory diagram of frequency allocation processing according to the embodiment of this invention;

FIG. 19 is an explanatory diagram of a fault display.

FIG. 20 is an explanatory diagram of a format of a notification signal to a mobile terminal.

FIG. 21 is an explanatory diagram of an operation of running out of a battery during a call according to the embodiment of this invention.

FIG. 22 is an explanatory diagram of a test operation of the transmitter / receiver according to the embodiment of this invention.

FIG. 23 is an operation explanatory diagram when the test result of the example of the present invention is defective.

FIG. 24 is an explanatory diagram of a process when a simultaneous call disconnection occurs according to the embodiment of this invention.

FIG. 25 is an explanatory diagram of a mobile communication system.

[Explanation of symbols]

 1 Mobile Terminal (MS) 2 Base Station (BTS) 3 Switching Station 4 Monitoring Station 5 Charge Center 6 Transmitter / Receiver (TRX) 7 Controller 8 Test Terminal (TTR) 9 Base Station Controller (BCE) 10 Switch ( MSC) 11 supervisory control device (OMC) 12 base station supervisory control device (BCWS) 13 data management center (DMC) 14 failure determination unit 15 storage unit 16 billing computer

Claims (22)

[Claims] 1. A mobile communication system having a base station that performs wireless communication with a mobile terminal and a monitoring station that connects the base station via a switching center, wherein the mobile terminal and the base are provided. The call processing alarm in the wireless communication with the station is collected at the monitoring station via the exchange, the collected call processing alarms are searched, and the number of collected call processing alarms within a certain period is calculated. A fault retrieval control method comprising: comparing with a threshold value, and determining that a fault has occurred at a location where the call processing alert has occurred when the number of collected call processing alerts exceeds the threshold value. 2. The number of collected call processing alarms is searched for the transmitter / receiver device of the base station, and the number of collected call processing alarms corresponding to the transmitter / receiver device within a certain period is compared with a threshold value. 2. The fault search control method according to claim 1, further comprising a step of determining that the transmission / reception device has a fault when exceeding the above condition. 3. The number of collected call processing alarms is searched for the mobile terminal, and the number of collected call processing alarms corresponding to the mobile terminal within a certain period is compared with a threshold value. 2. The fault search control method according to claim 1, further comprising the step of determining that the mobile terminal has a fault when the number exceeds the limit. 4. The number of collected call processing alarms corresponding to the mobile terminal and the frequency is searched for the collected call processing alarms, and the number of collected call processing alarms corresponding to the mobile terminal and the frequency within a certain period is compared with a threshold value. 2. The fault search control method according to claim 1, further comprising the step of determining a fault in a specific frequency of the mobile terminal when the number of collected call processing alarms exceeds a threshold value. 5. A mobile communication system having a base station for performing wireless communication with a mobile terminal, a monitoring station connecting the base station via an exchange, and a charge center having a charging computer. A call processing alarm in wireless communication between the mobile terminal and the base station is collected at the monitoring station via the switching center, and the billing computer is used when the call processing alarm is issued. By collecting the call number history, searching the collected call processing alarms to obtain the occurrence probability of the call processing alarms, comparing the occurrence probability with a predetermined threshold value, and the occurrence probability exceeds the predetermined threshold value. A fault retrieval control method, characterized in that it includes a step of determining a fault at a location where the call processing alarm is generated. 6. The number of times the call is disconnected within a certain period of time is searched for based on the collected call processing alarm within a certain period of time and the call time by the billing computer, and the number of times is compared with a threshold value, 6. The fault search control method according to claim 5, further comprising a step of determining that the call processing alarm is faulty when the number of times exceeds a threshold value. 7. The method according to claim 1, further comprising the step of searching for other call processing alerts except the call processing alert accompanied by the battery exhaustion information of the mobile terminal to determine whether a failure has occurred.
7. The fault retrieval control method according to any one of 6 to 6. 8. Comparing the call time from the billing computer when the call processing alarm is issued with a fixed time, and presuming that the battery of the mobile terminal is dead when the call time exceeds the fixed time. 7. The method according to claim 1, further comprising a step of searching for other call processing alarms excluding the call processing alarm when it is estimated that the battery is dead and determining whether or not a failure has occurred.
5. The fault search control method according to claim 1. 9. When call processing alarms with the same frequency or adjacent frequencies are collected simultaneously or almost simultaneously, it is determined that the call processing alarms are due to radio wave interference, and other call processing alarms are excluded except the call processing alarms. 7. The method according to claim 1, further comprising a step of searching and determining whether or not a failure has occurred.
The fault retrieval control method described in the item. 10. The monitoring station, when it is determined that a failure has occurred by the search and determination processing of the collected call processing alarm, specifies the transmission / reception device of the base station via the exchange station to perform a bit error rate measurement test. 10. The fault search control method according to claim 1, further comprising a step of executing the test to test whether the transmission / reception device is normal or abnormal. 11. The bit error rate measurement test,
11. The fault search control method according to claim 10, wherein the transmission / reception device of the base station and the return function of the test terminal of the base station are used. 12. The bit error rate measurement test,
11. The fault search control method according to claim 10, wherein the transmission / reception device of the base station and a return function of a designated mobile terminal are used. 13. The bit error rate measurement test,
11. The fault search control method according to claim 10, wherein the fault search control method is performed using a bit error rate measuring unit provided in the mobile terminal designated by the base station. 14. An input operation including a call of the mobile terminal during the bit error rate measurement test, and a step of stopping the bit error rate measurement test at the time of an incoming call to the mobile terminal. Claim 11 or 1 characterized
2. The fault search control method described in 2 or 13. 15. The method according to claim 15, further comprising: stopping the bit error rate measurement test when the reception level from the mobile terminal drops below a threshold value during the bit error rate measurement test. 15. The fault search control method according to any one of 11 to 14. 16. The control station controls the mobile terminal, which has determined that a fault has occurred by the search for the collected call processing alarm and the bit error rate measurement test, to cause the base station to transmit fault information. 16. The fault search control method according to claim 1, further comprising: 17. The monitoring station notifies the mobile terminal of a frequency determined to have a failure by the search of the collected call processing alarm and the bit error rate measurement test, and the failure occurrence frequency at the mobile terminal. 17. The mobile terminal sends refusal information when the base station allocates the failure occurrence frequency.
5. The fault search control method according to claim 1. 18. The failure occurrence as a subscriber information of a home location register at the exchange, with respect to a frequency determined to occur due to the collection call processing alarm search and the bit error rate measurement test, The frequency prohibition information is added and stored, and the frequency allocation control to the mobile terminal is performed by referring to the home location register.
5. The fault search control method according to claim 1. 19. A base station that performs wireless communication with a mobile terminal, and a monitoring station that connects the base station through an exchange, the monitoring station including a signal processing control unit and a failure determination. A data management center including a storage unit and a storage unit, and a monitoring control device including a base station monitoring control unit, wherein the failure determination unit collects by the monitoring control device via the exchange, and stores in the storage unit. Fault search control characterized by having a configuration for searching for accumulated call processing alerts and determining that a failure has occurred at the location where the call processing alerts have occurred when the number of call processing alerts within a certain period exceeds a threshold value system. 20. A base station that performs wireless communication with a mobile terminal, and a monitoring station that connects the base station via an exchange.
A charge center including a billing computer, wherein the monitoring station includes a data management center including a signal processing control unit, a failure determination unit, and a storage unit, and a monitoring control device including a base station monitoring control unit, The failure determination unit retrieves call processing alarms collected by the monitoring control device via the exchange and accumulated in the storage unit, and collects call information such as the number of calls and call time from the billing computer. A fault search control system, comprising a configuration for determining whether or not a fault has occurred based on the call processing alarm and the call information. 21. The switching center comprises a base station controller for controlling the base station, and a bit error rate measuring section for performing a bit error rate measurement test via the base station according to a command from the monitoring station. The fault retrieval control system according to claim 19 or 20, characterized by being provided. 22. The fault search control system according to claim 19, wherein the mobile terminal comprises a bit error rate measuring unit for performing a bit error rate measurement test according to a command via the base station. .