JPH08139643A - Radio base station auxiliary channel control system - Google Patents

Abstract

PURPOSE: To provide a radio base station auxiliary channel control system with which service to a mobile telephone set can be continued without any trouble even when any fault is generated at a transmission channel or the transmitters of a radio base station and an exchange station or even when the transmission channel is unavoidably disconnected for the maintenance of transmitters. CONSTITUTION: When a detecting part 31 detects the fault generated at a transmission channel 1 of a radio base station A, an auxiliary channel controller 34 switches 1st and 2nd switches 32 and 33, connects radio equipment 15 and a supervisory and controlling device 17 to a transmitter/receiver 35 and transmits a signal to be handled by the equipment 15 and the device 17 through a transmission/reception antenna 14 to a transmission/reception antenna 35a of another normal radio base station B. Corresponding to this transmission, a control part 36 performs control so that an exchange station 6 can perform communication with mobile equipment 8 through the other normal radio base station B which performs communication with the fault generated radio base station A. Thus, communication service is possible with no interruption.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to backup line control of a radio base station, and more specifically, a radio base station that communicates with a mobile device such as a car phone or a mobile phone terminal in a radio section, and a radio base station receives the data. The present invention relates to a protection line control system of a radio base station in a mobile phone system, that is, a mobile phone system, which is composed of a switching center that processes a signal transmitted from a mobile device.

[0002]

2. Description of the Related Art FIG. 10 is a block diagram of a conventional mobile communication system. In this figure, A, B, C and D are wireless base stations. 1, 2, 3 and 4 are transmission lines connecting to the respective radio base stations A to D, which are bundled on the way and connected to the exchange 6 as indicated by reference numeral 5. Reference numeral 7 is another transmission line network (another network) connected to the exchange 6, and reference numeral 8 is a mobile device (here, it is assumed to be a car telephone). Also, 9, 10, 11, 1
Reference numeral 2 is an area formed by the radio waves transmitted from the respective radio base stations A to D.

In such a configuration, when the mobile unit 8 is turned on, the mobile unit 8 communicates with the exchange 6 via the nearest base station (for example, B) having the highest reception level, and the mobile unit 8 can make and receive calls. When the subscriber makes a call from the mobile device 8, the mobile device 8 connects to another mobile device (not shown) or a landline telephone via the base station B, the transmission line 2, and the exchange 6.

Normally, radio base stations A to D are arranged in areas 9 to 12 each having a diameter of several kilometers to cover a wide range of callable areas. However, if the communication between the wireless base station B and the switching center 6 is cut off due to the disconnection of the transmission path 2 or the like, the communication between the mobile station 8 and the switching center 6 becomes impossible, and the wireless base station B Calls cannot be made in the covered area 10.

Therefore, conventionally, the reliability of the system has been improved by duplicating the devices in the radio base stations A to D. 11 is a diagram showing an internal configuration of the radio base stations A to D shown in FIG. 10. In FIG. 11, parts corresponding to the respective parts of FIG. 10 are designated by the same reference numerals, and the description thereof will be omitted.
However, in FIG. 11, it is assumed that there are N wireless base stations connected to the exchange 6 by the transmission lines 1 to n.

Each of the radio base stations A to N, as represented by the radio base stations A and B, represents transmission / reception antennas 14 and 18.
, Wireless devices 15 and 19, transmission devices 16 and 20, and monitoring and control devices 17 and 21. Also, exchange 6
Has a wireless base station centralized supervisory control device indicated by reference numeral 23, and a transmission device 24 which is a connection interface of transmission lines 1 to n connected to the wireless base stations A to N.

In such a configuration, when the mobile unit 8 is turned on, the radio base stations A to A are controlled by the switching center 6.
By receiving the signal having the highest reception level among the signals transmitted from N, it is possible to recognize which wireless base station (for example, A) the area is in, and periodically communicate with the exchange 6 to allow the mobile station 8 to communicate. Establish a system for making and receiving calls. When the mobile station 8 makes a call, the signal from the mobile station 8 is received by the transmission / reception antenna 14 of the radio base station A, relay processing is performed by the radio apparatus 15, and is transmitted from the transmission apparatus 16 to the transmission line 1 to be processed by the exchange station 6. Then, the call is connected to the destination terminal.

When the mobile station 8 receives an incoming call, the exchange 6 which receives a signal from a terminal of its own network / another network transmits a call signal from the radio base station A in the area where the mobile station 8 is present, and the mobile station 8 receives the signal. 8
Call. When the called mobile device 8 goes off-hook, the call is connected and the user can talk.

Further, the monitoring information in the wireless base station A is collected by the monitoring controller 7 and transmitted to the exchange 6 via the transmission device 16, so that the wireless base station centralized monitoring controller in the exchange 6 is collected. It can be monitored at 23.

Regarding the control, the control command from the wireless base station centralized monitoring control device 23 is transmitted to the monitoring control device 17 in the wireless base station A via the transmission device 16, and the monitoring control device 17 is controlled.
The wireless device 15 is controlled from the above.

[0011]

By the way, in the above-mentioned system, if some failure occurs in the transmission device 16 or 24 in the transmission path 1 or the radio base station A and the exchange 6, the radio base station A Since there is no communication between the exchanges 6, conventionally, in order to wait until the transmission line is restored or to make a call, there is no choice but to use weak radio waves transmitted from a nearby wireless base station (for example, B). If it takes time to recover by investigating the person's fault location, the service will stop within a range of several kilometers in diameter.

As described above, in the conventional mobile communication system, the switching center 6 and the radio base stations A to N are connected to the transmission lines 1 to 1.
When the transmission device in the transmission lines 1 to n or the radio base stations A to N and the switching center 6 has some trouble, the service is provided in the area of the radio base station related to the trouble. There was a problem that could not continue.

The present invention has been made in view of the above circumstances, and the transmission line is provided for the purpose of maintenance of the transmission line or maintenance when the transmission line or the transmission device of the radio base station and the switching center has some trouble. It is an object of the present invention to provide a radio base station protection line control system that can continue service to a mobile phone without any trouble even if it is unavoidable.

[0014]

FIG. 1 shows the principle of the present invention. Usually, a mobile communication system includes a plurality of radio base stations A, B, ..., N that perform radio communication with a large number of mobile devices 8 and a plurality of radio base stations A, B, ... N, as shown in FIG. , N are connected to each of the transmission lines 1, 2, ..., N, and are provided with an exchange 6 for processing communication signals of the mobile unit 8. Each of the radio base stations A, B, ..., N receives a communication signal from the switching center 6 or the mobile station 8, and the transmission devices 16, 16 ′ and 24 provided at both ends of each of the transmission lines 1 to n. Wireless devices 15, 15 'for transmitting to the mobile unit 8 or the switching center 6 via
The device state information of the wireless devices 15 and 15 'is collected and transmitted to the exchange 6, and the control signal of the exchange 6 is transmitted to the wireless device 1
Supervisory control device 17,1 for controlling transmission to 5, 15 '
7 '.

A feature of the present invention is that each radio base station A,
The failure / restoration of the transmission devices 24 of the wireless base stations A and B and the switching center 6 and the transmission lines 1 and 2 is applied to the transmission devices 16 and 16 'of B, ..., N (only A and B are shown here). First switches 32, 3 for providing detection units 31, 31 'for detecting and connecting circuits in the wireless base stations A, B to the wireless devices 15, 15'.
2 ', monitoring control devices 17, 17' are provided with second switches 33, 33 'for circuit connection in the radio base stations A, B, and radio signals for the mobile station 8 are provided to the radio base stations A, B. Transmitting / receiving antennas 14 and 35a for transmitting and receiving, transmitting / receiving devices 35 and 35 'for multiplexing / demultiplexing, amplifying and modulating / demodulating transmitted / received signals of the transmitting / receiving antennas 14 and 35a, and detection units 31 and
1'is connected to the transmission devices 16 and 16 ', and when the detection units 31 and 31' detect a failure, the first and second switches 32, 32 'and 33, 33' are switched to change the wireless Device 15, 15 'and supervisory control device 17, 1
7'and the protection line control device 34, 34 'for controlling the connection of the transmission device 7'to the transmission / reception device 35, 35' are provided, and a failure is detected by the detection unit (for example, 31), and the wireless device 15 and the monitoring control device 17 are provided. When and are connected to the transceiver 35,
A signal received by the faulty wireless base station A from the mobile device 8 by transmitting a signal handled by the wireless device 15 and the monitoring control device 17 to the transmitting / receiving antenna 35a of another normal wireless base station B via the transmitting / receiving antenna 14. Is transmitted to the exchange 6 via another normal wireless base station B.

When the switching station 6 receives the signal received from the mobile station 8 by the faulty radio base station A through the normal radio base station B, the exchange station 6 causes the faulty radio base station to receive the signal. It is preferable that the exchange 6 is provided with a control unit 36 that controls the mobile station 8 to communicate with the mobile station 8 via another normal radio base station B that communicates with the mobile station A.

[0017]

According to the present invention described above, for example, the radio base station A
If a failure occurs in the transmission line 1 of the wireless base station A
Is detected by the detection unit 31, and by this detection, the protection line control device 34 switches the first and second switches 32 and 33 to connect the wireless device 15 and the monitoring control device 17 to the transmission / reception device 35. By this connection, the signal handled by the wireless device 15 and the monitor control device 17 is transmitted to the transmitting / receiving antenna 35a of the other normal wireless base station B via the transmitting / receiving antenna 14, so that the faulty wireless base station A can move to the mobile station 8
The signal received from is transmitted to the exchange 6 via another normal wireless base station B.

By this transmission, the control unit 36 of the exchange 6
Controls the exchange station 6 to communicate with the mobile station 8 via another normal radio base station B which communicates with the faulty radio base station A.

That is, when a failure occurs in the transmission path system of the radio base station A, the mobile station 8 communicating with the radio base station A via another radio base station B can communicate with the exchange 6. As a result, communication services can be provided without interruption.

[0020]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 2 is a diagram showing a configuration of a mobile communication system based on a radio base station protection channel control system according to an embodiment of the present invention. In this figure, parts corresponding to those of the conventional example shown in FIG. 11 are designated by the same reference numerals, and the description thereof will be omitted.

In the radio base station A shown in FIG.
1 is a detection unit provided in the transmission device 16, 32 is a first switch having terminals a, b, c, d provided in the wireless device 15, 33 is a terminal e provided in the monitoring control device 17,
A second switch having f and g, a protection line control device 34, and a transmission / reception device 35, to which a transmission / reception antenna 35a is connected. In the exchange 6, the reference numeral 36a
Is an exchange, and 36 is a control unit. However, the first shown in FIG.
The connection between the second switch 32 and the second switch 33 is in the normal operation state. The wireless base station B and other wireless base stations not shown have the same configuration as the wireless base station A.

The detection unit 31 includes the transmission line 1 or the transmission device 1.
It detects the failure and restoration of 6, 24. The backup line control device 34 controls the switching of the first and second switches 32 and 33 in response to the detection of the failure and the recovery of the detection unit 31, and is configured as shown in FIG.

In FIG. 3, reference numeral 38 is a demultiplexer, and 39 is a CPU. The CPU 39 monitors an alarm output when the detection unit 31 detects a failure, and when the alarm is detected, the first and second switches 3 are detected via the demultiplexing unit 38.
Switching control of 2, 33 is performed. By the switching control, the demultiplexing unit 38 multiplexes the signals sent from the wireless device 15 and the monitoring control device 17 and transmits the signals to the transmitting / receiving device 35, and conversely, separates the signal from the transmitting / receiving device 35. Then, the data is transmitted to the wireless device 15 and the monitor control device 17.

When the CPU 39 confirms that the alarm of the detection unit 31 has been recovered, it sends a switching signal to the wireless device 15 and the monitor control device 17 via the demultiplexing unit 38.
Switching control is performed to return the first and second switches 32 and 33 to the normal operating state.

Next, the transmission / reception device 35 shown in FIG. 2 transmits the radio signal and the supervisory control signal of its own radio base station A to the transmission path 2 of the other radio base station B under the control of the protection line control device 34.
It transmits / receives via a transmitter / receiver (not shown in FIG. 2), and is configured as shown in FIG.

In FIG. 4, reference numerals 41, 42 and 43 denote T.
RX (transceiver board), 44 is RXAMP (reception amplification device), 45 is TXAMP (transmission amplification device), and 46 is DU
P (transmission / reception duplexer), 47 is a BPF (band pass filter), and 48 is a reception antenna. However, the receiving antenna 48 is omitted in FIG. In addition, the receiving antenna 48
Is provided with two antennas 35a and 48
This is because the radio waves of the same frequency transmitted from the other base stations B and C are received and the diversity processing using the higher level is performed.

The BPF 47 allows a signal of a predetermined frequency (for example, f _b ) received by the antenna 48 to pass through, and the RXAMP 44 amplifies the passed signal. Also RX
In the AMP 44, D is received by the transmitting / receiving antenna 35a.
The signal distributed by the UP 46 is also amplified. These amplified signals are demodulated by the TRXs 41 and 42 and sent to the protection line controller 34. The signal sent from the protection line controller 34 is modulated by the TRX 43, amplified by the TXAMP 45, and then transmitted from the antenna 35a via the DUP 46.

The configuration of the exchange 6 shown in FIG. 2 is shown in FIG. In FIG. 5, reference numerals 50 and 51 denote transmission devices indicated by reference numeral 24 in FIG. 2, which are provided corresponding to the respective radio base stations A, B. The exchange 36a is a CPU that controls the line switch 52 and the switching operation of the switch 52.
53, and processes a transmission / reception signal and the like to / from the mobile device 8. The wireless base station centralized monitoring control device 23
It has a function of monitoring and controlling the radio base stations A, B ... And the exchange 36a. Further, when the control unit 36 detects a failure in the transmission path 1 of a certain wireless base station (for example, A), the control unit 36 uses the control channel and the communication channel used by the wireless base station A for the other wireless base station B. Controls the process of changing the transmission path 2.

In such a configuration, during normal communication, as shown in FIG. 2, the terminals a and b of the first switch 32 are connected, and the terminals e and g of the second switch 33 are connected, so that the movement is possible. The wireless signal transmitted from the machine 8 and the device status information of the wireless device 16 collected by the monitoring control device 17 are transmitted to the exchange 6 via the transmission device 16 and the transmission path 1. As a result, the mobile station 8 can talk by performing two-way communication between the mobile station 8 and the exchange 6 in real time, and the wireless base station centralized supervisory control device 23 controls the monitoring of the radio base station A. be able to.

Next, a case where a failure occurs in the transmission line 1 of the radio base station A will be described with reference to FIG. Reference numeral 55 in FIG.
As shown by, it is assumed that a failure occurs in the transmission line 1. The detection unit 31 of the transmission device 16 is always the transmission line 1 or the transmission device 16
Is monitored by measuring the BER (bit error rate). Here, if a failure occurs in the transmission line 1,
When the deterioration of the BER is detected and the failure of the transmission path 1 is detected thereby, the detection unit 31 notifies the protection line control device 34 that the communication failure has occurred. Upon receiving this notification, the protection line control device 34, the terminal a of the first switch 32
And c are connected, and terminals f and g of the second switch 33 are connected.

In this case, the transmission / reception device 35 may be turned on by the control of the protection line control device 34.
When the power is turned on in this way, the power supply of the transmitter / receiver of the adjacent radio base station B, which transmits the signal of the mobile station 8 to the exchange station 6 instead of the radio base station A, is controlled by the control unit 36 of the exchange station 6.
To be entered under the control of.

That is, the transmitter / receiver 35 turns on the power supply of the transmitter / receiver 35 together with the above switching control. As a result, the protection line control device 34 transmits the signal of the mobile device 8 received from the wireless device 15 and the monitoring control device 17 to the transmitting / receiving device 35, and the transmitting / receiving device 35 transmits the wireless signal to the adjacent wireless base station B in the vicinity. To do.

That is, after the transmission signal of the mobile station 8 is received by the radio base station A, it is transmitted to the radio base station B and then transmitted from the radio base station B to the exchange 6. As a result, the mobile station 8 can talk in the area covered by the radio base station A, and the exchange 6 can monitor and control the radio base station A.

After that, the detection unit 31 measures the recovery of the BER, and the exchange 6 also detects the communication recovery of the wireless base station A, so that the transmission path 1 (or the transmission device 16) of the wireless base station A is detected. If either communication failure recovery is detected,
The communication failure recovery signal is sent to the protection line controller 34. The protection line control device 34 that has received the communication failure recovery signal returns the first and second switches 32 and 33 to the normal state shown in FIG. Further, the power of the transmission / reception device 35 is turned off. As a result, the operating state of the wireless base station A returns to the normal state.

Next, a case where a communication failure occurs in the adjacent radio base station B will be described with reference to FIG. As indicated by reference numeral 57 in FIG. 7, it is assumed that a failure has occurred in the transmission line 2.
Switching station 6 that has detected a communication failure in transmission path 2 of radio base station B
The control unit 36 notifies the protection channel control unit 34 of the occurrence of the communication failure of the wireless base station B via the detection unit 31 of the transmission device 16 of the adjacent wireless base station A.

Upon receiving this notification signal, the protection line control device 34 controls the connection between the terminals c and d of the first switch 32 and turns on the power of the transmission / reception device 35.
As a result, the protection line control device 34 receives the signal transmitted from the radio base station B via the transmission / reception device 35, and transmits it to the radio device 15 via the demultiplexing unit 38 inside the protection line control device 34. It can be processed and transmitted to the transmission device 16. As a result, the mobile device 8 can make a call via the radio base stations B and A, and the switching center 6 can monitor and control the radio base station A.

Further, the exchange 6 has its CPU 53 (see FIG. 5).
When the transmission path failure of the wireless base station B is detected as described above, the format of the signal transmitted to the transmission path 1 of the wireless base station A by switching the switch 52 by the control of the CPU 53 is shown in FIG. Make a proper assignment.

In normal operation, as indicated by reference numeral 60 in FIG. 8, the signal transmitted on the transmission path 1 of the radio base station A is, for example, a time slot "1" is a synchronization signal, "2" is a supervisory signal, and "2" is a supervisory signal. "3" and "4" are used as control signals, "5" to "12" are used for call signals, and "13" to "32" are empty. Therefore, as shown by the reference numeral 61, the synchronization transmitted from the wireless base station B whose transmission path 2 is disconnected in the empty time slots “13” to “24”,
Allocate monitoring, control and call signals.

When the disconnection of the transmission line 2 is recovered, the format of the original normal operation is restored by the control of the CPU 53 of the exchange 6. Furthermore, since the use of the same frequency in adjacent radio base stations causes interference, the frequencies are assigned so that the frequencies transmitted from the respective radio base stations A to G do not interfere with each other as shown in FIG. By making it possible, it becomes possible to avoid interference.
The frequency is repeated a certain number of times so that it can be effectively used.

[0040]

As described above, according to the present invention,
Even if the transmission line or the transmission device of the radio base station and the switching center has some trouble, or even if the transmission line is unavoidably cut for maintenance of the transmission device, the service to the mobile phone can be continued without any trouble. There is an effect that can be done.

[Brief description of drawings]

FIG. 1 is a principle diagram of the present invention.

FIG. 2 is a diagram showing a configuration of a mobile communication system using a radio base station protection channel control system according to an embodiment of the present invention.

FIG. 3 is a diagram illustrating a configuration of a protection line control device according to an embodiment.

FIG. 4 is a diagram showing a configuration of a transmission / reception device of an embodiment.

FIG. 5 is a diagram showing a configuration of an exchange according to an embodiment.

FIG. 6 is a diagram for explaining the response control when a failure occurs in the transmission line of the mobile communication system by the radio base station protection line control system of the embodiment.

FIG. 7 is a diagram for explaining the response control when a failure occurs in another transmission line of the mobile communication system by the radio base station protection channel control system of the embodiment.

[Fig. 8] Fig. 8 is a diagram for explaining a format in which a signal of a faulty wireless base station is transferred to an empty slot of a signal of another wireless base station.

FIG. 9 is a diagram showing an example of transmission / reception signal frequency allocation of each wireless base station in the embodiment.

FIG. 10 is a diagram showing a configuration of a conventional mobile communication system.

11 is a diagram showing an internal configuration of the radio base station shown in FIG.

[Explanation of symbols]

 A, B, N Radio base station 1, 2, n Transmission line 6 Switching station 8 Mobile station 15, 15 'Radio equipment 16, 16', 24 Transmission equipment 17, 17 'Monitoring and control equipment 32, 32' First switch 33 , 33 'Second switch 34, 34' Standby line controller 35 Transmitter / receiver 14, 35a Transmitter / receiver antenna 36 Controller

Claims (8)

[Claims] 1. A plurality of radio base stations communicating with a mobile device,
An exchange station connected to the radio base station, the radio base station receives a communication signal of the exchange station or the mobile station, and through a transmission device provided at both ends of each transmission path. A wireless device for transmitting to the mobile device or the switching center, and a monitoring control device for collecting device status information of the wireless device and transmitting to the switching center and transmitting a control signal of the switching center to the wireless device. In a radio base station protection channel control system in a mobile communication system comprising: a detection device for detecting a failure / recovery of the transmission device of the radio base station and the transmission device of the radio base station and the transmission path. A transmission / reception antenna for transmitting / receiving a radio signal to / from the mobile device, a transmission / reception device for multiplexing / demultiplexing, amplifying and modulating / demodulating a transmission / reception signal of the transmission / reception antenna, and the detection unit via the detection unit. Transmission When a failure is detected by the detection unit, a standby line control device is provided for controlling connection between the wireless device and the monitoring control device to the transmission / reception device when the detection unit detects a failure. In addition, a radio base station protection channel control method is characterized in that a signal handled by the radio device and the monitor control device is transmitted to a transmission / reception antenna of another normal radio base station via the transmission / reception antenna. 2. When the exchange station receives a signal received from the mobile station by the faulty radio base station via the other normal radio base station, the exchange station is identified as the faulty radio base station. 2. The radio base station standby system according to claim 1, wherein the exchange station is provided with a control unit for controlling communication with the mobile unit via the other normal radio base station for communication between the mobile stations. Line control method. 3. When the exchange detects the failure,
The control unit of the switching center controls the insertion of the signal of the faulty radio base station into the empty slot of the signal transmission path of the normal radio base station that communicates with the faulty radio base station via the transmission / reception antenna. The radio base station according to claim 2, wherein the radio base station controls to restore the signal of the faulty radio base station inserted into the empty slot when the exchange detects the restoration. Backup line control method. 4. When the detection unit detects the restoration,
4. The backup line control device performs control for returning a wireless base station restored by connecting the wireless device and the monitoring control device to the transmission device to a normal operation state. The radio base station protection line control method according to any one of the above. 5. When the exchange detects the restoration,
The control unit of the switching center stops the function of the transmission / reception device of the normal radio base station that has been communicating with the radio base station in the normal operation state via the transmission / reception antenna, and returns to the normal operation state. The radio base station protection line control method according to claim 4, wherein the protection base line control method is performed. 6. When the detection unit detects the failure,
The standby circuit controller turns on the power of the transmitter / receiver of the faulty radio base station and receives the signal of the faulty radio base station via the transmission / reception antenna. The radio base station protection channel control system according to any one of claims 1 to 4, wherein the control unit of the station turns on. 7. When the detection unit detects the restoration,
The standby circuit control device turns off the power supply of the transmission / reception device of the faulty radio base station and receives the signal of the faulty radio base station via the transmission / reception antenna. The radio base station protection channel control system according to any one of claims 1 to 4, wherein the control unit of the station is turned off. 8. A signal for communication between the faulty wireless base station and the normal wireless base station via the transmission / reception antenna does not interfere with a signal for the normal wireless base station to communicate with a mobile device. The radio base station protection channel control system according to any one of claims 1 to 7, wherein frequencies are assigned.