JPH01208035A - Mobile communication system - Google Patents

Abstract

PURPOSE:To perform the communication of radio equipments among plural zones by making correspondence of different radio control channels with different speech channels for the same speech channel of the radio equipment at every radio zone by a central control unit in plural radio zones. CONSTITUTION:In case where the plural radio zones (A-C) are superposed in a service area, transmission/reception among the radio equipments (1a1-1c1) existing extending over them are performed by a press-to-talk system as follows. Namely, the different radio control channels (2a-2c) and (3a-3c) are used as the control channels for the allocation and cancellation of the speech channel. Also, the different radio speech channels (4a-4c) are allocated for the same speech channel of the radio equipment. Furthermore, for the radio equipments (1a1-1c1), a means to scan the radio control channel from each zone and to compare reception electric field strength and to recognize its own tone is employed. In such a way, it is possible to perform closed communication among the radio equipments in a group easily.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a mobile communication system, and in particular, the present invention relates to a mobile communication system, in particular, a system in which a plurality of wireless devices communicate with each other via a wireless base station relay device according to the allocation and release of communication channels by a central control device. It relates to a mobile communication method for communication.

[Conventional technology]

A multi-channel access (MCA) mobile radio system is a mobile communication system in which a plurality of radios perform group calls via a radio base station relay device according to the allocation and cancellation of communication channels by a central control unit.

This MCA system consists of a control station and a command station for the MC installed on the ground, and multiple mobile stations mounted on vehicles, etc.
In other words, it is composed of mobile radio devices, and is defined as a radio zone corresponding to one service area.As shown in FIG. 9, radio zones A, B, . . . corresponding to each service area are defined.
form n.

In this case, group calls between radios 1 within each wireless zone A-n are possible as shown by the solid arrows, but calls between the same radios as shown by the dashed arrows in different radio zones are not possible. be.

(Problems to be Solved by the Invention) In the above-mentioned conventional mobile communication system, the same communication channel is allocated so that closed communication (group call) can be performed only between radio devices on the same floor in each radio zone, and one control station is 1
Since it is possible to control only the same group of radios that exist within one radio zone, if there are multiple radios that belong to the same group across multiple radio zones, they will be placed on the same communication channel. group communication between these radios becomes impossible.

In addition, in order to provide the same communication channel to multiple radio devices that exist across multiple wireless zones, it is possible to use a certain communication channel in common in multiple wireless zones, but in this case, between wireless zones There was a problem in that this required advanced technology such as phase compensation, resulting in high costs.

The present invention solves the above-mentioned problems by providing the same communication channel to multiple radios that belong to the same group of radios that exist across multiple radio zones, and allowing group calls between radios within the same group. The purpose is to provide a mobile communication system that makes it possible to

[Means for Solving the Problems] The mobile communication system of the present invention exists in a plurality of wireless zones within a service area, has a multi-channel access function, and scans control channels from multiple wireless zones to access each wireless zone. A wireless device that recognizes its own wireless zone by comparing the received field strength and wirelessly connects with the wireless device existing within the wireless zone using multi-channel access, receives and amplifies the radio waves from the wireless device, and transmits the frequency. A radio base station relay device that converts the data and sends it to all radio devices, and grasps the usage status of the radio base station relay device and allocates and releases communication channels to a desired group of radio devices in response to requests from the radio devices. In addition, when multiple wireless zones overlap in a service area, a different wireless control channel is transmitted for each wireless zone for the control channel for call channel allocation and cancellation, and It is equipped with a central control unit that makes different wireless communication channels correspond to the same communication channel of the existing wireless devices in each wireless zone.

[For production]

In the present invention, within the service area? When there are Jj number of overlapping radio zones, a different radio control channel is used for each radio zone as the control channel for communication channel allocation and release, and each radio is assigned to the same communication channel of the radio. Different wireless communication channels are assigned to each zone, and the wireless device scans and receives wireless control channels from multiple wireless zones, compares the received electric field strength, and recognizes the wireless zone in which it is located. As a result, the same communication channel is given to multiple radios belonging to the same radio group that exist across multiple radio zones, making it possible to perform closed communication between radios within the group. It becomes possible.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail based on concave surfaces.

FIG. 1 is a block diagram of a mobile communication system between multiple wireless zones in an embodiment of the present invention, and FIG. 2 is a block diagram showing the connection relationship between a central control unit and a communication channel relay device in an embodiment of the present invention. be.

In Figure 1, the service area is divided into wireless zones A, B, and C based on the unit of business operator. Within each of these wireless zones A, B, and C, closed group calls are possible as before. There are multiple radios with multi-channel access functionality that belong to the same group.

In addition, in FIG. 1, 1a+ is a radio device that exists in wireless zone A and belongs to group 1, 1b+ is a radio device that exists in wireless zone B and belongs to group 1, and 1c+ is a wireless device that exists in wireless zone C.
This is a radio device that exists in the group 1 and belongs to group 1. In other words, this indicates that a plurality of radio devices 1a1, 1b+, 1c+ belonging to group 1 exist across a plurality of radio zones A, B, and C.

2a, 2b, and 2c are wireless zones A, respectively.

A control channel receiving device installed in wireless zone B and wireless zone C is connected to the central control device 5 by a transmission path, and each wireless device fat, tbl, and 1c+ existing in each wireless zone A, B, and C is The transmitted radio control channel uplink is received, demodulated, and relayed to the central control device 5.

3a, 3b, and 3c are wireless zones A, respectively.

A control channel transmitting device installed in wireless zone B and wireless zone C, connected to the central control device 5 by a transmission path, modulating control signals from the central control device 5, and transmitting signals within each wireless zone A, B, and C. Wireless devices 1a+, 1b+,
1c+ as a downlink radio control channel.

4a, 4b, and 4c are wireless zones A, respectively.

A communication channel relay device installed in wireless zone B and wireless zone C, connected to the central control device 5 by a transmission path, and wireless devices fa+, 1 existing in each wireless zone.
b+, receives and amplifies the wireless communication channel upstream from IC+, performs frequency conversion, and transmits to each wireless zone A, B.
, C is transmitted as a downlink wireless communication channel to the radios 1a+, 1b+, and lc in C.

The central control device 5 manages the usage status of the communication channel,
Wireless device 1a is selected from available channels when a group call is requested.
One of the communication channels to be assigned to the +, 1b+, and 1c+ groups is selected.

The central control device 5 also maintains a table shown in FIG.
. . , the corresponding wireless channels fm can be grasped for each wireless zone A, B, and C. In particular, for wireless communication channel allocation, this memory table is referred to and the wireless communication channel is designated for the desired wireless 4fflla+, 1b+, and IC+ participating in the group call according to the memory table.

Although not shown in the drawing, there is a wireless system that wirelessly connects with wireless devices in each wireless zone using multi-channel access, receives radio waves from the wireless devices, relays and amplifies them, converts the frequency, and sends them to all wireless devices. Of course, it is equipped with a base station relay device.

In FIG. 2, communication channel relay devices 4a, 4b, and 4c placed in each wireless zone A, B, and C are located in the center, respectively. It is equipped with a transmitting system and a receiving system connected to the ff1l device 5 by a transmission line, and in each communication channel ■1 device 4a, 4
b, 4c are activated by an activation signal from the central controller 5, their receiving systems are connected to their respective transmitting systems via the central device 5.

Next, the operation of this embodiment configured as described above will be explained with reference to FIGS. 4 to 7.

First, as shown in FIG. 1, a radio device 1a existing in radio zone A and belonging to group 1 is present in radio zones B and C, and radio stage 1b of the same group 1 is present in radio zones B and C! Assume that an intra-group call is made to make a group call with +1cl.

Then, the wireless devices l existing in each wireless zone A, B, and C
ad, xbl, and lc scan and receive different radio control channels downlink from each radio zone A, B, and C, compare the received electric field strengths, and select their own location from the radio control channel with the maximum strength. Check the local wireless zone and listen on that control channel.

FIG. 5 shows the process flow for recognizing the wireless zone in which each of the radios 1a+, ltz, and IC+ resides, and includes step 20.
is a control channel Cch-1 for each radio to the radio zone.
, and store the received electric field strength.

In step 21, each wireless device shifts to the control channel Cch-2 of wireless zone B and stores its received electric field strength.

In step 22, each wireless device shifts to control channel Cch-3 of wireless zone C and stores its received field strength.

Then, in the next step 23, the wireless zone with the highest received field strength among the three control channels is stored as the own zone, and in the next step 24, the control channel is transferred to the zone in which the wireless zone is located. Then step 2
5, it is determined whether there is a timeout.

On the other hand, from the wireless m 1 a, in accordance with the signal format shown in FIG. 6, a control signal representing a communication mode intra-group call request, caller ID: group 1, as shown in the control sequence diagram of FIG. is sent to the central control device 5 via the control channel receiving device 2a using the wireless control channel upstream.

The central control unit 5 that received the control signal recognizes from the control signal that there is a request for intra-group communication from the radio fa+ belonging to group 1, searches for an empty communication channel, and then assigns the communication channel CH.

Determine.

Furthermore, the central controller 5 refers to the memory table shown in FIG. 3 to search for a wireless communication channel to be assigned to each wireless zone. In this case, assuming that communication channel C)(2) is allocated from among the available communication channels, the corresponding wireless channels of wireless zone A, wireless zone B, and wireless zone C are f4.rs and fb, respectively.

Therefore, the central controller 5 controls each wireless zone A.

According to the signal format shown in FIG. 7 (I), (II), and (Irl), the corresponding radio device 1 belonging to group 1
a+, 1b+, LC+, and the corresponding wireless channels f, f3. An announcement is made to move to r. The central control device 5 also includes communication channel relay devices 4a and 4b for each wireless zone A, B, and C.

4c, the speech channels f,,f,, respectively.

Activate to relay f6.

Among all the radios that have received the control channel downlink, the radios fa+, 1b, lc, which belong to group 1 and which have been ordered to shift to radio channels fa, fs, fb, are assigned to the designated radio according to the notification. Move to channel. Thereafter, between the main radios, transmission and reception are repeated alternately using the breath talk method, and the communication channel relay device 4
a, 4b.

Make a group call via 4C. At this time, the communication channel relay devices 4a, 4b, and 4c are activated by an activation signal from the central controller 5, and connect their receiving systems to the transmitting system via the central controller 5, and also connect the wireless channels f4. fs.

The communication channel upstream from each wireless device that has shifted to f6 is received, amplified, and frequency converted, and the communication channel is transferred to radio channels f, , f, as the downstream communication channel.

Send to each radio device that has shifted to f6.

As a result, a plurality of radio devices 1a+ belonging to the same radio device group exist across a plurality of radio zones.

The same communication channel can be given to the radios 1a+, 1b+, and lc+ in the group, making it possible to perform closed communication (group communication) between the radios 1a+, 1b+, and lc+ on the same floor.

In this case, for group calls between the radios 1a+, lb, and 1c+, turn on the breath talk button.

This is done by turning it off and repeating transmission and reception alternately.

It should be noted that the present invention is not limited to the configuration in which one wireless device of the same group exists across three wireless zones as shown in the above embodiment, but the present invention is not limited to the configuration in which one wireless device of the same group exists across three wireless zones. As such, group calls can be made across multiple radios A to n.

[Effects of the Invention] As described above, according to the present invention, when a plurality of wireless zones exist within a service area, a different wireless channel is provided for each wireless zone as a control channel for allocating and canceling a call channel. , Regarding communication channels, the same communication channel corresponds to different wireless channels depending on each wireless zone, and regarding radio equipment,
By scanning control channels from multiple wireless zones and comparing the electric field strength of each, it is possible to recognize the wireless zone in which it is located, without requiring advanced control technology such as phase control between wireless zones. , using a simpler method to identify multiple wireless devices belonging to the same wireless device group that span multiple wireless zones.
The same communication channel can be given to only the wireless devices in the group, and closed communication can be performed between the wireless devices in the group.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the mobile communication system of the present invention, FIG. 2 is a detailed block diagram showing the connection relationship between the central control unit and the communication channel relay device in the embodiment of the present invention, and FIG.
FIG. 4 is a control sequence diagram in the embodiment of the present invention; FIG. 5 is the zone recognition process of the wireless device in the embodiment of the present invention. FIG. 6 is a format diagram of an intra-group call origination signal in an embodiment of the present invention, FIG. 7 is a format diagram of an intra-group call incoming call notification signal in an embodiment of the present invention, and FIG. FIG. 9 is a conceptual diagram of a group call spanning multiple wireless zones according to the invention. FIG. 9 is a conceptual diagram showing a conventional mobile communication system. [Explanation of symbols of main parts] 1a+, 1b1, 1c+ '・' Radio equipment 2a, 2b,
2c... Control channel receiving device 3a, 3b, 3c...
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Claims (1)

[Claims] (1) Exists in multiple wireless zones within the service area and has a multi-channel access function, scans control channels from multiple wireless zones, compares the received field strength of each, and recognizes the wireless zone in which it is located. a wireless base station relay that wirelessly connects with the wireless device existing in the wireless zone by multi-channel access, receives and amplifies radio waves from the wireless device, converts the frequency, and transmits to all the wireless devices. It grasps the usage status of the device and the wireless base station relay device and manages the allocation and release of communication channels to a desired group of wireless devices in response to requests from wireless devices, and also manages the allocation and release of communication channels to a desired group of wireless devices in response to requests from wireless devices. When they overlap, a different radio control channel is transmitted for each radio zone for the control channel for the above-mentioned communication channel allocation and cancellation, and a different radio control channel is transmitted for each radio zone to the same communication channel of a radio device that exists across multiple radio zones. A mobile communication system comprising: a central control unit that corresponds to different wireless communication channels;