JPH06224831A - Mobile radio communication system - Google Patents

Abstract

PURPOSE:To receive a mobile radio service even in a radio wave blind area. CONSTITUTION:When a call is transmitted from a mobile station 32 included in a radio wave blind area 12 via a control channel, a repeater station 31 calls a radio base station 21 via a contact channel. The station 21 receives the call via the contact channel and selects the prescribed one (m) pieces of speech channels (fn+1 to fn+m) which are common to both of the area 12 and a service area. Then the station 21 informs the station 31 of the selected speech channel, and the station 31 connects the station 32 to the station 21 via the speech channel to perform the communication.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile radio communication system within a limited range (service area), and in particular, a mobile station existing in a radio dead zone can receive a mobile radio service. The mobile wireless communication system described above.

[0002]

2. Description of the Related Art In a mobile telephone service or the like within a limited range (service area), when a call is made or a call is received, a mobile station in the service area transmits control data to a radio base station via a predetermined control channel. Exchange of
A channel to be used for a call is assigned from a plurality of call channels of the wireless base station, and communication is performed via the call channel. FIG. 10 is an explanatory diagram of such a mobile radio communication system. Reference numeral 1 is a service area in which a car telephone service is possible, 2 is a radio base station having one control channel and many call channels, and 3a to 3n.
Is a car (mobile station) equipped with a car telephone, 4 is an exchange, 5 is a public line, and 6a to 6m are telephones connected to the public line, such as homes and offices. Predetermined mobile station 2a-
When a call is originated from 2n via the control channel, the call origination signal is received by the radio base station 2 and the vacant communication channel is designated. Thus, thereafter, the mobile station can talk with other mobile stations in the service area or the telephones 6a to 6n connected to the public line 5 via the call channel.

[0003]

By the way, if there are mountains in the service area, there is an area (radio wave insensitive area) 7 where radio waves are blocked and communication is not possible. Conventionally, there is a problem that a call cannot be made in the radio wave insensitive area 7, and in order to receive a call service, it is necessary to move to a service area where radio waves reach. For this reason, it is required to be able to receive the mobile wireless service even in the radio dead area. In most cases, the radio wave insensitive area hidden in a mountain or the like has a smaller population and is used less frequently than a service area in which the radio wave reception state is good. For this reason, the number of communication lines is not so required, and therefore it is required to be able to receive the mobile wireless service with a narrowed number of communication lines.

SUMMARY OF THE INVENTION In view of the above, an object of the present invention is to provide a mobile radio communication system capable of receiving a mobile radio service even in a radio wave insensitive area. Another object of the present invention is to provide a mobile radio communication system in which call channels are narrowed down according to the call volume in a radio dead zone. Still another object of the present invention is that the main controller of the radio base station can use the conventional one as it is without considering the dead area,
It is an object of the present invention to provide a mobile radio communication system that only needs to change the channel switching device to be compatible with the radio dead zone. Still another object of the present invention is to provide a mobile radio communication system capable of centrally monitoring the operational status and failure status of the entire mobile radio system.

[0005]

FIG. 1 is a diagram for explaining the principle of the present invention. 11 is a mobile radio service area, 12 is a radio wave dead area within the service area, 21 is a radio base station,
Reference numeral 22 is a mobile station in the service area, 31 is a relay station that relays communication between the mobile station existing in the radio dead area and the radio base station, 32 is a mobile station in the radio dead area, and 41 is a public line. The radio base station 21 is connected to the public line 41, and a main control device 21a for designating a communication channel for a call and a channel exchange device for performing channel exchange control between the main control device and the mobile station and relay station. 21b is provided. The radio base station 21 uses the service area control channel (frequency fc) and the communication channel with the relay station (frequency f).
cm), n call channels dedicated to the service area (frequency f1 to fn), and m call channels common to the radio dead zone and the service area (frequency fn + 1 to fn + m), and the relay station 31 Is provided with a communication channel (frequency fcm) for the wireless base station 21 and the common m communication channels (frequency fn + 1 to fn + m), and is insensitive to the mobile station 32 in the radio dead area. Area control channel (frequency fc ') and m inactive area speech channels (frequency f
n + 1 'to fn + m').

[0006]

When the mobile station 32 in the radio dead area 12 makes a call via the dead area control channel (frequency fc '), the relay station 31 sends to the radio base station 21 via the communication channel (frequency fcm). When a call is made and the radio base station 21 receives the call via the contact channel, the relay station 31 selects a predetermined call channel from among m common call channels (fn + 1 to fn + m). The relay station connects the mobile station 32 and the radio base station 21 for communication via the communication channel.
As described above, since the relay station is provided and the radio base station can communicate with the relay station, the mobile station can receive the mobile radio service even in the radio dead area. Further, the common call channel number m may be determined according to the call volume in the radio dead area, and the equipment of the relay station can be configured according to the call channel number.

When the communication channel is designated by the main control device 21a, the channel switching device 21b changes the communication channel to a communication channel corresponding to the area where the originating or terminating mobile station is located. The call channel is sent to the mobile station 22 or the relay station 31, and the mobile stations 22 and 32 and the radio base station 21 are connected via the call channel to perform communication. In this way, the main control device 21a of the radio base station 21 can use the conventional device that does not consider the radio dead area as it is, and only the channel switching device 21b needs to be configured for the radio dead area. Further, the channel control device 21b is provided with a status monitoring unit for monitoring and collecting the operating status, failure status, etc. of the entire system, and a replacement monitoring terminal is connected to the status monitoring unit to exchange data between the status monitoring unit and the replacement monitoring terminal. Then, the exchange monitoring terminal displays the system operation status, failure status, and the like. By doing so, it is possible to centrally monitor the operating state, the fault state, and the like of the entire mobile radio system.

[0008]

1 is a block diagram of a mobile radio communication system according to an embodiment of the present invention. In the figure, 11 is a mobile radio service area,
12 is a radio dead zone within the service area, 21 is a radio base station, 22 is a mobile station within the service area, 31 is a relay station for relaying communication between mobile stations existing in the radio dead zone and the radio base station, and 32 is Mobile stations in radio dead area, 4
1, 41 'are public lines, 42 are exchanges, 43a to 43n
Is a telephone, such as a home or office connected to a public line,
Reference numeral 1 is an exchange monitoring table provided at a remote place.

Radio base station The radio base station 21 is connected to the public line 41 and also has a main controller 21a for designating a call channel for a call.
A channel switching device 21b for performing channel switching control between the main control device and mobile stations and relay stations, a radio unit 21c for transmitting and receiving radio waves of each channel, and an operating state and a fault state of the entire system connected to the channel switching device. It is equipped with a personal computer-configured exchange monitor table 21d for displaying and a TA modem 21e. The radio base station 21 has a service area control channel (frequency fc), a communication channel with the repeater (frequency fcm), n communication channels dedicated to the service area (frequency f1 to fn), and a radio dead area. It is provided with m communication channels (frequency fn + 1 to fn + m) common to the service area and a total of (n + m + 2) channels (actually 32 channels). If 32 channels are not enough, a maximum of 5 channel switching devices 21b can be added and connected to the main control device 21a. Therefore, the wireless base station 2
1 can accommodate up to 160 channels.

The radio section 21c corresponds to a control channel, a communication channel and each call channel, and a radio SRMc,
SRMcm, comprising a SRM ₁ ~SRMn + m, each radio is respectively connected to the channel switching apparatus 21b, and to be able to transmit and receive radio waves having a frequency assigned to the corresponding channel. The channel switching device 21b is the main control device 21a.
And channel switching device 21.
b transmits / receives data to / from a remote exchange monitoring console 51 via the TA modem 21e and the public line 41 ', and the exchange monitoring console can remotely monitor the operating status and failure status of the entire system.

Relay station The relay station 31 transmits and receives radio waves of a communication channel and a communication channel to and from the radio base station 21, respectively.
a, a radio unit 31b for transmitting and receiving radio waves of a control channel and a communication channel, which are provided for mobile stations within the radio dead zone, and a signal conversion unit 31 for performing signal conversion processing.
have c. That is, the relay station 31 includes m communication channels (frequency fn + 1 to fn + m) common to the communication channel (frequency fcm) for the wireless base station 21, and
Control channel (frequency f
c ') and the speech channels for m dead areas (frequency fn +
1'-fn + m ').

The radio section 31a is provided with one radio corresponding to each of the communication channel and each call channel on the radio base station side, and each radio can transmit and receive the radio wave of the frequency assigned to the corresponding channel. There is. The wireless unit 31b also has one wireless device corresponding to the dead-area control channel on the mobile station side and each call channel, and each wireless device can transmit and receive radio waves of the frequency assigned to the corresponding channel. ing. The signal conversion unit 31c
When a call is received from the mobile station 32 via the blind area control channel, the call is transmitted via the communication channel to the radio base station 2
1 to receive the control signal from the wireless base station via the communication channel, the control signal is sent to the mobile station 32 via the dead area control channel. In addition, the signal conversion unit 31c
When the call channel is designated from the wireless base station 21 for the call, the predetermined call channel for the dead area is designated to the mobile station 32. Furthermore, the signal conversion unit 31c is provided in the wireless base station 21.
When a voice signal or the like is received from the mobile station 32 through the designated call channel for the dead area, the voice signal received from the mobile station 32 through the call channel for the dead area is received from the mobile station 32. To the radio base station via the call channel.

Channel Switching Device FIG. 3 is a block diagram of the channel switching device, in which SCC1 is a first control channel unit for transmitting and receiving control signals via the service area control channel, and a radio device SRMc of the service area control channel. It is connected to the. SCC2
Is a second control channel unit for the dead area for transmitting and receiving control signals via the communication channel, and is connected to the communication channel radio SRMcm. SCS1 is (n + m)
This is a first call channel unit for transmitting and receiving voice signals and the like through the call channels for (= 30) channels, and is connected to the radio units SRM _{1 to} SRMm + n for each call channel. The SCS2 is a second call channel unit for 32 channels for transmitting / receiving control signals, voice signals, etc. to / from the main control unit 21a, the MEC is a channel exchange control unit for performing channel exchange control and radio device allocation control, and the SVM is a system. A status monitoring unit that monitors and collects the overall operating status, failure status, etc.
NF is a communication interface unit that controls data exchange between the data collection monitor SVM and the exchange monitor console 21d and data exchange between the data collection monitor SVM and the relay station 31.

Overall Operation (a) Calling from Mobile Station in Service Area FIG. 4 is an explanatory diagram of a call control procedure when a mobile station 22 in the service area 11 having a good reception state makes a call. is there. When the first control channel unit SCC1 receives the calling signal from the mobile station 22 via the service area control channel, it notifies the channel exchange control unit MEC. The channel switching control unit MEC is the first control channel unit S
When a call signal is received from CC1, one call channel (in other words, a radio of the call channel) CHr that is vacant from the n call channels dedicated to the service area is reserved, and the second call channel unit SCS2 A calling signal is sent to the main control unit 21a via. The channel exchange control unit MEC reserves one call channel out of the common m call channels when all n call channels dedicated to the service area are in use or cannot be used due to a failure or the like.

Then, when a call response is sent from the main controller 21a, the channel exchange control unit MEC sends the call response to the mobile station 22 via the first control channel unit SCC1. After that, the main controller 21a moves to the radio dead area 1
Call channel CHi that is vacant from the table managed by the user regardless of whether the call is from 2
And determines the call channel as the channel exchange control unit MEC.
To notify. That is, the main control device 21a determines a vacant communication channel and notifies the channel exchange control unit MEC of the vacant communication channel, as in the conventional case in which no radio wave insensitive area countermeasure is taken. Thus, during a call, a voice signal between the main controller 21a and the channel exchange control unit MEC is transmitted via the designated call channel CHi. However, the communication between the mobile station 22 and the channel exchange control unit MC is performed via the reserved communication channel as described later. In parallel with the above, the main controller 21a calls the exchange 42 and calls, for example, a home telephone via the public line 41.

When the call channel CHi is designated, the channel exchange control unit MEC changes the call channel to the call channel CHr dedicated to the reserved service area, and changes it via the first control channel unit SCC1. The selected call channel CHr is sent to the mobile station 22. In this way, the channel exchange control unit MEC reserves the call channel, and the main controller 21 uses the reserved call channel.
The reason for changing the call channel notified from a is as follows. The main controller 21a regards all channels other than the service area control channel and the contact channel as call channels, as in the previous case in which no radio wave insensitive area measures are taken.
The vacant speech channel is determined and notified to the channel exchange control unit MEC. Therefore, the call channel CHi designated by the main controller 21a may be one of the m call channels common to the service area and the dead area. The number of call channels (= m) common to the service area and the dead area is determined according to the call volume in the dead area,
The number m is small. Therefore, for a call or an incoming call from a mobile station in the service area, if a call channel dedicated to the service area is available, the call channel dedicated to the service area is used as much as possible, and the common call channel is insensitive. Must be free for communication with the area. For the above reasons, the channel exchange control unit MEC reserves a call channel dedicated to the service area when a call is made and reserves the call channel CHi notified from the main control device 21a. Is converted into.

If the mobile station 22 is notified of the call channel, the call channel (reserved call channel) CH
The mobile station and the channel exchange control unit MEC are connected via r, and the channel exchange control unit MEC and the main control unit 21a are connected via the communication channel CHi designated by the main control unit 21a. Since the control device 21a and the home telephone are connected to each other, a call path between the mobile station 22 and the home telephone is established, and thereafter, a call becomes possible. That is, the voice signal from the mobile station 22 is the communication channel CHr.
To the channel exchange control unit MEC, where channel exchange is performed, the main control device 21a is reached via the channel CHi, and thereafter the data is transmitted to the home telephone via the public line. The voice signal from the home telephone is also transmitted to the mobile station 22 in the opposite direction.

(B) Calling from a mobile station in the radio dead area FIG. 5 is an explanatory diagram of a call control procedure when a call is made from the mobile station 32 in the radio dead area 12. The relay station 31 uses the blind area control channel to transmit the radio dead area 12
Upon receiving a call from the mobile unit 32 existing therein, a call signal is sent to the radio base station 21 via the communication channel.
When making a call from the blind area, it is necessary to switch the changeover switch (not shown) of the mobile station 32 to the blind area side. When the second control channel unit SCC2 receives the calling signal from the relay station 31 via the communication channel, it notifies the channel exchange control unit MEC. The channel switching control unit MEC is the second control channel unit SC.
When a call signal is received from C2, one call channel (in other words, a radio device of the call channel) CH that is vacant from m call channels common to the dead area and the service area CH
Reserves r ', and also the second call channel part SC
A calling signal is sent to main controller 21a via S2. Then, when there is a call response from the main controller 21a, the channel exchange control unit MEC notifies the relay station 31 of the call response via the second control channel unit SCC2, and the relay station notifies the mobile station 32. .

Thereafter, the main controller 21a determines an available call channel from the table managed by itself without considering whether the call is made from the radio dead area 12, and the call channel CHj To the channel exchange control unit MEC. That is, the main control device 21a determines a vacant communication channel and notifies the channel exchange control unit MEC of the vacant communication channel, as in the conventional case in which no radio wave insensitive area countermeasure is taken. Thus, during a call, a voice signal between the main controller 21a and the channel exchange control unit MEC is transmitted via the designated call channel. However, the relay station 31 and the channel exchange control unit MEC are connected via the reserved communication channel CHr 'as described later. In parallel with the above, the main controller 21a calls the exchange 42,
A home telephone, for example, is called via the public line 41.

When a call channel is designated, the channel exchange control unit MEC sets a call channel C common to the service-insensitive area and the service area where the call channel is reserved.
It is changed to Hr 'and the changed communication channel is sent to the relay station 31 via the second control channel unit SCC2. The channel exchange control unit MEC reserves the call channel,
The reason for changing the call channel notified from the main control device 21a with the reserved call channel is as follows. The main control unit 21a determines all available channels other than the service area control channel and the contact channel as call channels and determines the available call channels, and determines the channel exchange control unit MEC as in the previous case in which no measures are taken against the radio wave insensitive area.
To notify. Therefore, the call channel designated by the main controller 21a may be a call channel dedicated to the service area. Therefore, the channel exchange control unit MEC reserves a communication channel common to the dead area and the service area when a call is made, and the main control unit 2
The call channel notified from 1a is converted into the reserved call channel.

When the call channel is notified to the relay station 31, the relay station and the channel exchange control unit MEC are connected via the call channel CHr ', and the call channel CHj designated by the main control unit is used. Since the channel exchange control unit MEC and the main control device 21a are connected and the main control device 21a and the home telephone are connected, the communication path between the mobile station 32 and the home telephone is via the relay station 31. After the establishment, the call becomes possible. Therefore, the mobile station 32
The voice signal from the communication channel CH passes through the relay station 31.
It reaches the channel exchange control unit MEC via r ', where the channel exchange is performed, reaches the main control unit 21a via the channel CHj, and thereafter is transmitted to the home telephone via the public line. The voice signal from the home telephone is also transmitted to the mobile station 32 in the opposite direction.

(C) Processing when an incoming call is received from the public line FIG. 6 is an explanatory diagram of an incoming call control procedure when an incoming call is received from the public line. When an incoming call arrives at the main control device 21a via the public line 41, the main control device 21a receives the vacant call channel CHk.
Is notified to the channel exchange control unit MEC via the second call channel unit SSC2. In response to this incoming notification, the channel exchange control unit MEC reserves one speech channel CHr 'and CHr from the common m speech channels and the n speech channels dedicated to the service area, respectively.
Then, the channel exchange control unit 21b sends the reserved communication channel CHr 'out of the m common communication channels to the relay station 31 via the contact channel, and
The reserved communication channel CHr is sent from the dedicated n communication channels via the service area control channel. As a result, the main controller 21a and the service area 11
The mobile stations 22 inside are connected by the communication channels CHk, CHr, and the main control unit 21a and the mobile stations 32 in the radio dead area 12 are connected by the communication channels CHk, CHr '.

Next, the main controller 21a sends a loop check signal from the speech channel CHk to the channel switching control unit MEC, and the channel switching control unit MEC sends the loop signal to the service via the service control channel and the communication channel, respectively. It is sent to the mobile station 22 and the relay station 31 in the aria. In response to this loop signal, the terminating mobile station returns a response signal to the channel exchange control unit MEC via the communication channel CHr or the communication channel CHr '. As a result, the channel exchange control unit MEC leaves the connection by the call channel for which the response notification has been given, releases the connection thereafter, and thereafter, the call can be made through the connected call channel. That is, if the called mobile station exists in the radio dead area 12, the call channel CHk,
The connection by CHr is released, and if the terminating mobile station exists in the service area 11, the connection by the communication channels CHk, CHr 'is released.

(D) Collection and monitoring control of operation status, failure status, etc. The status collection monitoring unit SVM (FIG. 3) in the channel switching device 21b is connected to the channel switching control unit MEC, and also the relay station 31 and the communication interface INF. The system is connected via a cable and collects system trackfick information (incoming calls, number of calls, etc.), current channel exchange status, operating status of each part, mounting status, failure status, etc. and stores it in the built-in hard disk. Along with the replacement monitoring tables 21d, 51
Transfers certain information in response to a request from (see FIG. 2),
The exchange monitoring consoles 21d and 51 display or print out the information on the display screen. The functions of the exchange monitor console are roughly classified into an operation monitor function, a fault monitor function, and a debug function.

Operation Monitoring Function The operation monitoring function has the following functions. (1) Monitor up to 5 radio wave insensitive areas. (2) Display in real time on the screen how the radios of the radio base station 21 and the relay station 31 are currently switched and connected, and provide information to the operator. (3) The system usage status is displayed on the screen, and traffic information such as call status, number of incoming calls, and number of outgoing calls is displayed and managed. FIG. 7 shows an example of the call information screen, and shows the call state at the reception time of 13:22:40. FIG. 8 is an example of a traffic information display screen for one week. (4) The above operation status is saved on the hard disk for one week, the status before the day is referred, and the daily / weekly report of the operation status is automatically printed on the printer at regular intervals.

Fault Monitoring Function The fault monitoring function includes the following functions. (1) The operating status of each part used in the system (stopped, operating, standby for operation, failure occurring) is displayed on the display screen, and alarms, unit mounting status, active system are displayed.
/ Display the status of the backup system on the screen and provide information to the operator. (2) Display the status of channels in the home zone (service area) and radio dead area that are serviced by the system,
It provides the operator with information such as blocked channels, control channels, and faulty channels. (4) For each unit used in the system, channel block control, call restriction control, and active / standby system switching control are performed. (5) Display fault information on the display screen so that you can see at a glance what kind of fault has occurred, and keep a history of fault information. In addition, every day, the failure status of the day is automatically printed by the printer on a regular basis. FIG. 9 shows an example of a list display screen of failure information.

Debugging function (1) The desk displays the electronic message (data) received from another unit in real time, and stores the received data in the hard disk. (2) Commanding commands from the console instructs the programs of other units to start / stop data logging. It also collects the data logged by the programs of other units and stores it in the disk. (3) The memory dump instruction is given to the programs of other units, and the data is collected and stored in the disk. Although the present invention has been described above with reference to the embodiments, the present invention can be variously modified according to the gist of the present invention described in the claims, and the present invention does not exclude these.

[0028]

As described above, according to the present invention, the control channel (frequency fc ') for the dead area is transmitted from the mobile station in the radio dead area.
When a call is made via the relay station, the relay station makes a call to the radio base station via the contact channel (frequency fcm), and when the radio base station receives the call via the contact channel, the common m calls A predetermined call channel is selected from the channels (fn + 1 to fn + m) and notified to the relay station, and the relay station connects the mobile station and the radio base station via the call channel to communicate. Therefore, the mobile station can receive the mobile wireless service even in the radio dead area, and the common call channel number m can be determined according to the call volume in the radio dead area. The equipment of the relay station can be configured according to the number.

Further, according to the present invention, when the communication channel is designated by the main control device, the channel switching device changes the communication channel to a communication channel according to the area in which the mobile station that originates or receives the communication channel is located. Then, the changed call channel is sent to the mobile station or relay station, and the mobile station and the radio base station are connected via the call channel to perform communication. The conventional one that does not consider the dead area can be used as it is, and only the channel switching device needs to be configured for the radio dead area. Further, according to the present invention, the channel control device is provided with a status monitoring unit for monitoring and collecting the operating status, failure status, etc. of the entire system, and a replacement monitoring terminal is connected to the status monitoring unit to connect the status monitoring unit and the replacement monitoring. Since data is exchanged between the terminals and the system monitoring operation status and failure status are displayed on the exchange monitoring terminal, the operation status and failure status of the entire mobile radio system can be centrally monitored.

[Brief description of drawings]

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

FIG. 2 is a configuration diagram of a wireless communication system of the present invention.

FIG. 3 is a configuration diagram of a channel switching device in a radio base station.

FIG. 4 is an explanatory diagram of a call control procedure from a mobile station within a service area.

FIG. 5 is an explanatory diagram of a call control procedure from a mobile station in a radio dead area.

FIG. 6 is an explanatory diagram of an incoming call control procedure.

FIG. 7 is an example of a call information display screen.

FIG. 8 is an example of a traffic information display screen.

FIG. 9 is an example of a failure information display screen.

FIG. 10 is an explanatory diagram of a conventional mobile communication system.

[Explanation of symbols]

 11- ・ Mobile radio service area 12- ・ Radio-free area 21 ・ ・ Radio base station 21a ・ ・ Main controller 21b ・ ・ Channel switching device 22 ・ ・ Mobile station in service area 31 ・ ・ Relay station 32 ・ ・ Radio wave Mobile station in blind area 41 ... Public line

Claims (6)

[Claims] 1. A channel to be used by a mobile station from among a plurality of communication channels of the wireless base station via a predetermined control channel between the wireless base station and the plurality of mobile stations in the service area. In the mobile wireless communication system in which the mobile station (32) and the radio base station existing in the radio dead zone (12)
A relay station (31) for relaying communication between (21) is provided, and the radio base station (21) has a control channel for the service area, a communication channel with the relay station, and n communication channels dedicated to the service area. And m communication channels common to the radio dead zone and the service area, the relay station (31) has a communication channel to the radio base station and the common m communication channels, and to the mobile station. It is equipped with a blind area control channel and a plurality of blind area call channels, and when a mobile station in the radio dead area makes a call via the blind area control channel, the relay station wirelessly connects via the contact channel. When the base station is called and the wireless base station receives the call via the contact channel,
A predetermined call channel is selected from among the m common call channels and notified to the relay station, and the relay station connects the mobile station and the radio base station for communication via the call channel. And mobile radio communication system. 2. A radio base station (21) is connected to a public line (41), and a main control device (21a) for designating a call channel for a call, the main control device (21a) and a mobile station. (22) and the channel switching device (2) that controls the channel switching between the relay station (31)
1b), the channel switching device (21b) reserves one call channel out of the common m call channels when the call is received through the contact channel, and sends the call to the main controller (21a). When a call signal is sent and a call channel is designated by the main control unit, the call channel is changed to the reserved call channel, the changed call channel is sent to the relay station, and the relay station sends the call channel via the call channel. The mobile radio communication system according to claim 1, wherein the mobile station (32) and the radio base station (21) are connected to perform communication. 3. When the channel switching device (21b) receives an outgoing call via the service area control channel, it reserves one of the n service-dedicated communication channels and the main controller (21a). ), A call channel is designated by the main control unit, the call channel is changed to the reserved call channel, and the changed call channel is sent to the mobile station (22). The mobile radio communication system according to claim 2, wherein communication is performed between the mobile station (22) and the radio base station (21) via a call channel. 4. The channel switching device is provided with a common m channel when n call channels dedicated to a service area are not occupied.
4. The mobile radio communication system according to claim 3, wherein one communication channel is reserved from the individual communication channels. 5. The channel switching device (21b) is dedicated to the common m communication channels and the service area when a call channel is notified from the main control device (21a) by an incoming call from the public line (41). One call channel is reserved from each of the n call channels of, and the reserved call channel is sent from the common m call channels to the relay station (31) through the contact channel, and the service area control is performed. A mobile station (22) uses a reserved communication channel from the dedicated n communication channels via the channel.
Then, a loop check signal is sent, and only the connection by the call channel for which a response notification is sent in response to the loop check signal is left, and communication is performed between the mobile station and the wireless base station via the call channel. The mobile radio communication system according to claim 2, characterized in that: 6. A channel control device (21b) is provided with a status monitoring unit (SVM) for monitoring and collecting the operating status, failure status, etc. of the entire system, and a replacement monitoring terminal (21d) is connected to the status monitoring unit, Data is exchanged between the status monitoring unit and the exchange monitoring terminal,
2. The mobile radio communication system according to claim 1, wherein an operation status, a failure status, etc. of the system are displayed on the exchange monitoring terminal.