JPH02119326A - Multi-zone mobile communication system - Google Patents

Abstract

PURPOSE:To perform group call among mobile machines scattered in plural radio zones by comprising a call channel designation signal of mobilng destination call channel numbers corresponding to all the radio zones, and selecting a moving destination channel by the movie machine. CONSTITUTION:When a call issuing request is outputted from the mobile machine 1-a, a call issuing signal is transmitted on an incoming control channel in the radio zone (a), and it is sent to a communication controller 3 via a transmitter/receiver 2-1a for control channel in a radio base station 2-a. The communication controller 3 performs the retrieval of a idle call channel, and allocates a call channel group based on a call channel managing table 3-1. An ID number for identification of mobile machine group corresponding to the request on a call side is added on the call channel designation signal, and it is transmitted on an outgoing control channels in all the radio zones from the communication controller 3 via the receivers 2-1a, 2-1b, and 2-1c in each radio base station. Each of the mobile machines 1-a, 1-b, and 1-c receiving the speech channel designation signal reads in to select a slot corresponding to the radio zone where its own mobile machine exists, and migrates a call channel to a designated call channel.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a mobile communication system in which telephone calls are made within a group consisting of mobile devices scattered in a plurality of wireless zones.

[Conventional technology]

There is an MCA method as a method in which a plurality of mobile devices in a group perform group calls under control of call channel designation from a line control device.

The MCA system consists of an MCA control station that controls and relays wireless line connections, a command station that has a fixed wireless network installed,
Consists of multiple mobile devices installed in cars etc.
A wireless zone is formed around the CA control station.

FIG. 5 is a diagram showing an example of a conventional system configuration, in which M
CA 1liII control is 4-α, 4-b, 4-C and 3
stations exist in their respective wireless zones a and b.

The system centered on six MCA control stations, which shows an example where C is adjacent, is independent. In addition, the command station 5 and mobile devices 6-1, 6-2 are MC, A,
It belongs to control station 4-al, ::. In the example of FIG. 5, mobile stations 6-3 to 6-n exist in wireless zones b and C, respectively.

In FIG. 5, a command station 5 and mobile Ppi 6-1 . 6-2 is given the same communication channel by the communication channel designation control from the MCA control station 4-a and can make a telephone conversation.

However, in response to a call request from the command station 5 or mobile devices 6-1 and 6-2, the mobile W16-3-6-n existing in wireless zones b and C receives the call channel designation from the MCA control station 4-a. Mobile devices 6-3 to 5 because they cannot be controlled.
Group calls including -n are not possible.

In this way, in the conventional MCA system, communication channel designation control is performed only within one wireless zone, and group calls between mobile devices existing in the same wireless zone are possible. Specified control was not possible, and group calls were not possible when there were multiple wireless zones.

[Problem to be solved by the invention]

As mentioned above, in conventional mobile communication systems, a control station is placed in each wireless zone and it is possible to specify and control communication channels for a group of mobile devices within the same wireless zone. Since it is not possible to control communication channel designation for mobile devices existing in a wireless zone, group calls across wireless zones have not been possible.

An object of the present invention is to solve the above-mentioned problems and provide a mobile communication system that allows group calls between mobile devices scattered in a plurality of wireless zones.

[Means to solve the problem]

According to the invention, the above-mentioned object is achieved by the means specified in the claims.

That is, the present invention provides a mobile device that has a multi-channel access function and recognizes its own wireless zone;
a plurality of wireless base stations forming the wireless zone, and a line control device that manages the usage status of communication channels in all wireless zones and controls the designation of communication channels to a desired group of mobile devices in response to requests from mobile devices. A mobile communication system that sends a call channel designation signal in all wireless zones in response to a single call request, in which the call channel designation signal is configured with a transfer destination call channel number corresponding to all wireless zones, and This is a multi-zone mobile communication system in which the device selects a destination communication channel based on the received communication channel designation signal and the wireless zone in which it is located.

Hereinafter, the effects and the like of the present invention will be explained in detail based on Examples.

〔Example〕

FIG. 1 is a diagram showing a system configuration of an embodiment of the present invention.

In the figure, 1-a, 1-b, and 1-c are mobile devices that have a multi-channel access function and recognize their own wireless zones.

2-a, 2-b, and 2-e are radio base stations forming respective radio zones a, b, and c, and each radio base station has control channel transceivers 2-1a, 2-1.
b, 2-1c and communication channel transmission/reception fi2-
21a-2-2na, 2-21b-2-2nb
+2-21c -2-2nc.

3 is a line control device that manages the usage status of communication channels and controls the designation of a desired communication channel in response to a call request from a mobile device; this line control device manages the designation control and usage status of communication channels; It has a management table 3-1 for this purpose.

Mobile devices fil-a, 1-b, and 1-c each indicate a state in which they are located in wireless zone a+bta, and these mobile devices belong to the same predetermined call group.

FIG. 2 is a sequence diagram showing the connection control operation in this embodiment, with symbols 1-a and 1-b.

1-c, 2-a, 2-b, 2-c and 3
corresponds to the mobile device, s#X base station, and line control device shown in FIG.

FIG. 3 shows an example of the format of the communication channel designation signal sent to the downlink control channel, and FIG. 4 shows the format of the communication channel management table held by the line control device.

This speech channel management table stores combinations of frequencies assigned to each wireless zone, and the line control device fills in the speech channel designation and usage status with this group number.

In addition, the frequency fla-(na of wireless zone a is the communication channel transmitting/receiving channel 2-21a-2- of FIG. 1, respectively).
2nal: Compatible, and the same applies to wireless zone b, wireless, and zone C.

Next, the operation of this embodiment will be explained using FIGS. 1 to 4.

As shown in the sequence diagram of FIG.
-b and 1-c each receive the control channel of the wireless zone in which they are located, and recognize the wireless zone in which they are located.

Now, if a call request is made from mobile IJI machine 1-a,
Send a calling signal on the uplink control channel of wireless zone a,
Control channel transceiver 2-1a of wireless base station 2-a
The data is sent to line control device 3 via. Upon receiving the call signal, the line control device 3 searches for an empty communication channel and allocates a communication channel group based on the communication channel management table shown in FIG.

As shown in FIG. 3, the communication channel designation signal is appended with an ID number for identifying a group of mobile devices in response to a request from the calling side, and sent from the line control device 3 to each radio base station for control channel transmission and reception (
It is transmitted via iHfi 2-1a, 2-1b, and 2-1c on tri-control channels in all wireless zones.

Each mobile 4i-a that received the communication channel designation signal,
1-b and 1-c are channel designations of 7↑-mat shown in Figure 3? The incoming lot corresponding to the wireless zone in which the user is located is selected and read out of the l'lS portion, and the communication channel is transferred to the designated communication channel.

FIG. 3 shows the case where the combination of designated frequencies is group 1, mobile device 1-a is fla, mobile f
il-b is designated flb, and movement 1-0 is designated flc.

The audio signal transmitted from the mobile 8!1-a enters the control device 3 via the communication channel transmission/reception 8!2-21 of the wireless base station 2-a, and its output is transmitted to the communication channel of each wireless base station. Transmission and reception for @2-21a, 2-2 lb,
2-2) c l: Distributed and transmitted (i) in all wireless zones. Mobile devices 1-b and 1-c that receive this can also transmit in the same way if necessary.

In this way, in the present invention, by always performing call channel designation control in all wireless zones for one call, it is possible to easily connect the line and conduct the call no matter which wireless zone the other party is moving to. becomes possible.

In addition, although the wireless zone is explained as a, b + c, it is not limited to these three, and there are many wireless zones depending on the situation.
It is possible to form an ellipse.

〔Effect of the invention〕

As explained above, according to the present invention, the same communication channel designation signal is transmitted in all wireless zones within the service area (by transmitting the communication channel designation signal to the transfer destination II!I2 channel number corresponding to all wireless zones). In addition, it has the advantage that mobile devices scattered in multiple radio zones can easily perform two-group conversation with each other by selecting the destination channel by the mobile device6. This is highly effective in systems where simplification and shortening of connection time are strongly desired.

Furthermore, it is possible to easily deal with an increase in the number of wireless zones that occurs due to the expansion of the service area.

[Brief explanation of drawings]

Fig. 1 is a diagram showing the system configuration of an embodiment of the present invention, Fig. 2 is a sequence diagram showing the connection control operation of the embodiment, fJ
Figure S3 is a diagram showing an example of a 7-order communication channel designation signal, Figure 4 is a diagram showing an example of a communication channel management table in which the control device manages the combination of frequencies allocated to each wireless zone, and Figure 5 is a diagram showing a conventional example. 1 is a diagram showing an example of a system configuration. 1-u, 1-b, 1-c - mobile device, 2
-a, 2-b + 2-c - wireless base station, 2-1
a H2-1b + 2-1c -- Transceiver for control channel, 2-21n-2-2na12-21b-2-2nb. 2-21c to 2-2nc...To transmission/reception for communication channels, 3...Line control device,
3-1 ・・・・・・Call channel management table agent Patent attorney Honma Susanzu diagram diagram

Claims (1)

[Scope of Claims] A mobile device that has a multi-channel access function and recognizes its own wireless zone, a plurality of wireless base stations forming the wireless zone, and manages usage status of communication channels in all wireless zones. A mobile communication system that consists of a line control device that controls the designation of a communication channel to a desired group of mobile devices in response to a request from a mobile device, and that sends out a communication channel designation signal in all wireless zones in response to a single call request. In this method, a communication channel designation signal is configured with destination communication channel numbers corresponding to all wireless zones, and the mobile device selects a destination communication channel from the received communication channel designation signal and the wireless zone in which it is located. A multi-zone mobile communication system characterized by: