JPS6329863B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to frequency sharing technology by consolidating dedicated wireless communications between fixed stations and mobile stations belonging to many different groups.

Recently, the demand for commercial mobile communications has been increasing, but the limited frequency band makes it difficult to allocate frequencies for individual dedicated communications, and the disadvantages are that the equipment required to configure each individual system is large. Ta.

An object of the present invention is to provide a mobile radio communication system that eliminates such drawbacks.

Hereinafter, the present invention will be explained in detail with reference to the drawings.

FIG. 1 is a conceptual diagram of a system according to an embodiment of the present invention, and FIG. 2 is a system configuration diagram. Each mobile station 19, 20 running within each service area (for example, a radius of about 15 km) 11 to 17 belongs to each office, and communication is dedicated for each group with the mobile stations 19, 20 belonging to each office. It is assumed that the communication is carried out by the fixed stations 8 to 10 of each office via the control station 18 and the base stations 1 to 7. The control station 18, base stations 1 to 7, and fixed stations 8 to 10 are connected by wired communication paths. When calling a mobile station from fixed stations 8 to 10, for example, when calling from fixed station 9 to mobile station 19 located anywhere in the system, the mobile station 19 is identified and selected from all base stations 1 to 7. It would be simple if the control station 18 controlled the system so as to send out a paging signal, but for that purpose, the mobile station 19
All service areas 11 until is selected and responds.
Since ~17 paging channels are occupied, there is a drawback that other communications cannot be performed.

The present invention solves this problem. First, with a paging signal for all service areas, the control station 18 controls all mobile stations 19 and 20 in the group belonging to the fixed station 9 to be called and to move to an empty communication channel in each service area. Next, a selection signal specifying the mobile station 19 is sent to the designated communication channel to which the mobile station 19 has been moved, and if the mobile station 19 responds, the mobile station continues to use the communication channel in the service area to which it responded. and start communicating. Mobile station 20 that received the selection signal specifying mobile station 19
The control circuit (description omitted) detects that the call has not been made, controls the switch back to the original call channel, and prepares for the next call or the call originating from the local station.
A call from the mobile station 19 is made, for example, on a paging channel in the service area 11, and is transmitted from the receiving base station 1 to the control station 18.

The control station 18 specifies an empty communication channel in the service area 11, moves the mobile station 19 thereto, receives a paging signal for selecting the fixed station 9, and then sends the controller 100 to the mobile station 19.
The base station 1 is decoded by the exchange 101 and connected to the fixed station 9 through the communication lines 21 and 32.

The interface device 200 of the base station 1 converts the communication line 21 from the fixed station 9 connected by the control station 18 into the input/output of the transmitter, for example, 201, and the receiver, for example, 211 of the communication channel, from 4 wires to 2 wires. interface, configure a line, and perform communication.

When the communication is terminated by sending a termination signal from either side, the control station 18 restores the exchange 101,
A signal for restoring the paging channel is sent to the mobile station 19 via the base station 1, and the mobile station 19 receives the signal.
The control circuit controls the restoration to the paging channel. Note that 202 is a transmitter, 212 is a receiver,
221 is a transmission combiner, 222 is a reception distributor, 22
3 is a transmitter/receiver duplexer, and 240 is an antenna.

A mobile radio communication system having the above functions can be easily realized by control calculation programming of the control circuit of the mobile station and the controller of the control station.

The characteristics of the mobile radio communication system to which the present invention is applied are as follows.

(1) Since multiple dedicated communication groups can use common base station equipment, the amount of capital investment per group is small.

(2) Since multiple dedicated communication groups share a common communication channel and concentrate the lines through multi-access, the frequency resources of communication channels can be used effectively.

(3) In particular, the paging channel for each base station, which is necessary for the above-mentioned multi-access concentration, is used only for group paging, and individual selection is transferred to the communication channel, increasing its utilization.
Increase the allowable traffic amount.

(4) Furthermore, after completing the individual selection in the preceding paragraph (3), more effective use of frequencies can be achieved by opening communication channels outside the service area necessary for communication.

[Brief explanation of drawings]

FIG. 1 is a conceptual diagram of a system according to an embodiment of the present invention, and FIG. 2 is a system configuration diagram. In the figure, 1 to 7...Base station, 8, 9, 10
... Fixed station, 19, 20 ... Mobile station, 11 to 17
...Service area, 18...Control station, 21-2
7, 31-33... wired communication path, 100... controller, 200... interface device, 201,
202...transmitter, 211, 212...receiver,
221... Transmission combiner, 222... Reception distributor,
240... An antenna.

Claims (1)

[Claims] 1. From fixed stations of multiple dedicated communication groups that subscribe to a system consisting of multiple service areas each having multiple communication channels and dedicated paging channels, to a specific mobile station belonging to a group existing in an unspecified service area. In a mobile radio communication system for calling, first, all mobile stations belonging to a group are designated and transferred to empty communication channels in each service area using paging channels in all service areas;
Next, it has means for selectively calling a specific mobile station,
After the specific mobile station selective call is completed, the remaining uncalled mobile stations are restored to the paging channel, thereby opening the communication channel designated for the individual call outside the service area where the specific mobile station was present. mobile radio communication system.