JP2978839B2 - Prestalk wireless communication system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a presto wireless communication system, and more particularly, to a network in which a service area is constituted by a plurality of radio base stations and a communication control station while a mobile station moves within the service area. The present invention relates to a press-talk wireless communication system for performing press-talk communication by a multi-channel method between a station and a mobile station and between mobile stations.

[0002]

2. Description of the Related Art A conventional press-talk radio communication system of this kind uses a one-pair radio channel for radio communication on an uplink (from a mobile station to a radio base station) and on a downlink (from a radio base station to a mobile station). And press talk communication is performed by combining the above. Conventionally, these technologies have been established, and a wireless communication system for public business, an MCA system for business, and the like are typical examples.

In these conventional press-talk radio communication systems, when a communication request from a mobile station or a radio base station is activated, an available radio channel (an unused radio channel) is selected from radio channels managed by the radio communication system. This is a method in which communication is allocated in a time-division manner for the corresponding communication as one pair of uplink and downlink, and a pair of wireless channels is secured from the start to the end of communication for communication.

[0004]

In this conventional press-talk radio communication system, group communication by a communication group (a group of one or a plurality of mobile stations including one or a plurality of radio base stations) is performed by a press-talk communication system. If so, mobile stations other than the transmitting mobile station are in a receiving state and are not transmitting.

[0005] Therefore, when this group communication is performed in a range over a plurality of radio base stations, the radio base station where the transmitting mobile station is located uses the allocated uplink and downlink radio channels simultaneously. In a radio base station having only receiving mobile stations, there is a problem that the allocated uplink radio channel is not used.

In particular, in the case of a business-use radio communication system, business-related contact information for a plurality of mobile stations to be instructed is broadcast from a commanding radio base station or a mobile station that supervises a communication group. Therefore, the transmission time from the receiving mobile station is very short, and the number of uplink radio channels effectively used by the radio base station is one or less per group communication. That is, in the case of command communication from the radio base station to the mobile station, there is a problem that the uplink radio channel is not effectively used in all the radio base stations.

[0007] This situation also applies to the case where the individual communication is performed by the press talk communication. In the case of individual communication between two radio base stations, the number of mobile stations being transmitted is one, and the uplink radio channel of the radio base station to which the mobile station in the receiving state belongs is not used. There is. (Object of the Invention) An object of the present invention is to cancel the management of radio channels in one uplink and one downlink performed by the conventional press-talk radio communication system, and separate the uplink radio channel and the downlink radio channel for each communication control station. The present invention provides a press-talk radio communication system capable of effectively using an uplink radio channel and reducing the number of necessary radio channels by managing the necessity of an uplink radio channel for each radio base station. It is in.

[0008]

According to the present invention, there is provided a press-talk radio communication system comprising: a plurality of radio base stations accommodating and managing a plurality of uplink radio communication channels and a downlink radio communication channel; A plurality of mobile stations that communicate via a radio base station, and a communication control station that manages and controls transmission requests from the plurality of radio base stations, comprising the plurality of radio base stations and the communication control station. Form a network with multiple service areas,
A press-talk radio communication system that performs radio communication by a multi-channel access technology and a press-talk call switching technology between the radio base station and the mobile station and between the mobile stations while moving within the plurality of service areas, A wireless digital transmission unit for transmitting and receiving control data between the plurality of mobile stations and the plurality of wireless base stations,
The plurality of radio base stations and the communication control station each include transmission right control means for controlling a plurality of transmission requests between the plurality of radio base stations and the communication control station and performing exclusive control of a transmission zone; The base station includes channel management means for allocating / releasing an uplink wireless communication channel in a time-division manner in synchronization with on / off of a press operation of the mobile station during communication with the communication control station and the mobile station, respectively. The communication control station separately manages an uplink wireless communication channel and a downlink wireless communication channel, and manages allocation control of an uplink wireless communication channel during communication based on whether or not the mobile station during communication has a transmission right; Means for managing the transmission channel and the reception channel separately from each other, and performing a press operation in a communication state. A first generation / judgment means for generating or judging a first control signal for requesting or releasing an uplink radio communication channel with the radio base station; and an audio signal and the first control signal. Switching transmission means for switching and transmitting, each of the plurality of radio base stations, the designation means for designating the transmission channel and the reception channel to the mobile station at the instruction of the communication control station, A second generation / judgment means for generating or judging a second control signal for requesting or releasing a wireless communication channel with a mobile station, and receiving a communication request or a transmission request from the mobile station; Third generation or determination of a third control signal for giving and receiving a request for transmission permission and permission to the control station
Generating / determining means, voice generating / decoding means for generating or decoding a voice signal, and voice transmitting / receiving the voice signal for exchanging communication information such as the voice signal with the communication control station. A communication path switching means for switching between a transmission path and a reception path, wherein the communication control station manages a communication right and a transmission right requested from each of the plurality of radio base stations; Means, return means for returning press talk communication between the radio base stations, communication path switching / managing means for switching and managing a communication path for exchanging voice signals between the plurality of radio base stations, Control signal transmitting / receiving means for transmitting / receiving a fourth control signal to / from the wireless base station;
Transmission / reception channel management means for managing transmission channels and reception channels of the plurality of radio base stations in units of the communication control station.

[0009]

Next, the present invention will be described with reference to the drawings.

FIG. 1 is a system diagram showing a press-talk radio communication system according to an embodiment of the present invention.

In FIG. 1, a press-talk radio communication system according to the present embodiment has one communication control station 1, a plurality of radio base stations 10, 20, 30, and a plurality of mobile stations a1, a
2, a3, b1, b2, and b3, and the mobile stations a1, a2, and a3 belonging to the group a and the mobile stations b1 and b1 belonging to the group b for the radio base stations 10, 20, and 30.
b2 and b3 are connected to form a system showing a state in which group communication can be performed between mobile stations in each of the groups a and b.

That is, in the communication in the group a, the transmission from the mobile station a1 is received by the radio base station 10, and the radio base station 10 and the radio base station 2 are controlled by the communication control station 1.
0 shows an example in which the mobile station a2 and the mobile station a3 are receiving signals. In the group b, similarly, the mobile station b1 transmits and the mobile station b2 and the mobile station b3 receive signals. Shows the case.

FIG. 2 is a functional block diagram showing a mobile station according to the present embodiment.

In FIG. 2, mobile stations a1, a2, a3, b1, b2, and b3 in the present embodiment each include a microphone or other audio input unit 101 including a microphone or the like, and an audio signal from the microphone or other audio input unit 101. Signal generation section 109 for converting the input into a digital signal, switch / operation setting section 102 for detecting an operator's press operation, etc., operation / warning display section 103 for displaying an operation / response, switch operation, etc. , An operation processing unit 105 for instructing a response display or making a communication request, a communication management unit 106 for receiving and managing communication in response to a communication request, and in the communication management unit 106 for managing the frequency of the transmission channel Transmission channel management unit 107
And a control signal generator 110 for generating a control signal for communication connection control under the control of the communication manager 106.
A switch 113 for switching between an audio signal and a control signal under the control of the communication management unit 106, a transmitter 115 for digitally modulating and transmitting an output signal of the switch 113, and a transmitter 1.
A frequency setting unit 116 for setting a frequency to the receiver 15 and the receiver 117 according to an instruction of the communication management unit 106; a transmission antenna 118 for radiating a transmission wave into space; a reception antenna 119 for receiving a reception wave from space; A receiver 117 for digitally decoding a received wave, and a communication management unit 10
6, a control signal determination unit 111 for determining the control content of the control signal, an audio signal decoding unit 112 for decoding an audio signal, and an audio output device 104 such as a speaker including a speaker. It is composed of

FIG. 3 is a functional block diagram showing a radio base station according to the present embodiment.

In FIG. 3, each of radio base stations 10, 20, and 30 according to the present embodiment is a receiving antenna 22 for receiving a control channel reception wave from space from a mobile station.
8, a control channel receiver 222 that digitally decodes a received wave of the control channel, a control signal determination unit 216 that determines the control content of the control signal and passes it to the pre-talk communication management unit 208, and a pre-talk communication management unit 208 Control signal generation unit 2 that generates a control signal for communication control station 1 in accordance with the instruction
04, a control signal determination unit 203 that determines a control signal transmitted from the communication control station 1, a press talk communication management unit 208 that manages press talk communication by the control signal,
A transmission channel designation unit 209 which designates a transmission channel based on the control of the communication control station 1 and a reception channel designation unit 210 which designates a reception channel, and has a transmission right in group communication. A transmission right management unit 211 that manages a mobile station, a control signal generation unit 215 that generates a control signal based on an instruction of the Prestalk communication management unit 208, a control channel transmitter 221 that performs digital modulation on the generated control signal, A transmission antenna 227 for radiating a transmission wave of the control channel into space, and a reception antenna 22 for receiving a reception wave of the communication channel from space.
9, 230, and communication channel receivers 223, 224 for digitally decoding received waves of the communication channel from the mobile station.
And control / audio decoding sections 217 and 218 for decoding an audio signal or a control signal from the decoded digital signal; a reception path switching section 212 for switching a reception path under the control of the pre-talk communication management section 208; Audio signal transmitting units 205 and 206 for performing impedance conversion and transmitting to the communication control station 1; audio signal receiving units 201 and 202 for performing level adjustment and impedance conversion of the audio signal returned from the communication control station 1; A transmission path switching section 207 that switches the transmission path between the communication control station 1 and the transmitter side under the control of the talk communication management section 208, and a control for generating and transmitting a control signal or an audio signal to the selected transmitter. / Sound generation units 213 and 214 and communication channel transmitter 2 for digitally modulating and transmitting an input control signal or sound signal And 9,220, transmitting to a transmitting wave of the communication side channel space antenna 225, 226
It is composed of

FIG. 4 is a functional block diagram showing a communication control station according to the present embodiment.

In FIG. 4, a communication control station 1 according to the present embodiment includes a control signal determination section 3 for determining the content of a control signal requested from each of the radio base stations 10, 20, and 30.
05, a press talk communication management unit 308 that receives a communication request signal and a transmission request signal from a control signal and manages press talk communication, and a communication zone management unit 309 in the press talk communication management unit 308 that manages a communication zone.
A communication path management unit 310 that manages a communication path; a transmission zone management unit 311 that manages a transmission zone; a transmission channel management unit 312 that manages a transmission channel; a reception channel management unit 313 that manages a reception channel; A control signal generation unit 306 that generates a control signal in accordance with an instruction from the talk communication management unit 308, and an audio signal reception unit 301 that performs level adjustment and impedance conversion of audio signals from each of the wireless base stations 10, 20, and 30 and receives them. 302
And the received voice signal into the press-talk communication management unit 308.
Channel switching unit 307 for switching the communication channel based on the instruction of
And press-talk communication return units 314, 315, 316, and 317 that return audio signals of the press-talk communication, and audio that is subjected to level adjustment and impedance conversion of the returned audio signals to the wireless base stations 10, 20, and 30 and transmitted. It comprises signal transmission sections 303 and 304.

FIG. 5 shows a signal format used between the radio base station and the mobile station according to the present embodiment.
FIG. 3 is a diagram showing a control signal format, and FIG.

In FIGS. 5A and 5B, the control signal format includes both an uplink signal 401 (a signal from a mobile station to a radio base station) and a downlink signal 404 (a signal from a radio base station to a mobile station). Control command (402 or 405)
And control parameters (403 or 406). The audio signal format is composed of the switching flag (408 or 411) and the audio signal or control signal (409 or 412) for both the up signal 407 and the down signal 410. The audio signal switching flag (408 or 411) indicates whether the next signal is an audio signal or a control signal type, and has an effect of making it easier for the receiving side to determine the control signal.

FIG. 6 is a diagram showing a control sequence for performing group communication according to the present embodiment, and FIG. 7 is a management table for storing the use status of the uplink Tch and the downlink Tch of the radio base station in the present embodiment. FIG.

Next, the operation of the communication control according to the present invention will be described in detail with reference to FIGS.

In the present embodiment, in the operation sequence of the group communication of the mobile station groups (a1, a2, a3) belonging to the group a, the mobile station a1 belonging to the radio base station 10 requests the group communication. The operation will be described.

From the mobile station a1 having a group communication request,
Based on the control signal format of FIG.
, A group communication request (Cch) by Cch (control wireless channel) is transmitted.

The specific internal operation of the mobile station a1 is as follows.
An operation of a group communication request is added to the switch / operation setting section 101 of the mobile station a1 by the communication operator, and is transmitted to the communication management section 106 after being judged by the operation processing section 105. The communication management unit 106 determines that the operation of the communication operator is a group communication request, generates a group communication request by the control signal generation unit 110, and transmits the request to the transmitter 11 via the switch 113.
5 and transmitted as a group communication request (Cch) signal. At this time, the frequencies of the transmitter 115 and the receiver 117 are set to Cch by the frequency setting unit 116.

When this group communication request (Cch) is received by the radio base station 10, it is determined to be a group communication request, and is sent to the communication control station 1 as a new group communication request.

The specific internal operation of the radio base station 10 is as follows. The control channel receiver 222 receives a group communication request (Cch) signal of the mobile station a1, and the control signal determination unit 216 determines that the request is a group communication request. Are transferred to the press talk communication management unit 208. The press talk communication management unit 208 determines that the request is a new group communication request, and the control signal generation unit 204 generates a group communication request signal for the communication control station 1 and sends it to the communication control station 1.

The communication control station 1 receives the group communication request and determines whether it can be permitted as a new group communication. If it can be permitted, the downlink T
The channel designation signal is transmitted to the radio base station 10 and the radio base station 20.

The specific internal operation of the communication control station 1 is as follows.
Then, it is determined that the request is a new group communication request, and the request is sent to the press talk communication management unit 308. Here, the communication zone management unit 30
9, transmission channel management unit 312, reception channel management unit 3
13, the communication path management unit 310, etc., determine the system source, and only when a new group communication can be permitted, the control signal generation unit 306 generates a downlink Tch designation to make the wireless base station 10 and the wireless base station 20 To send to.

The radio base station 10 receives the downlink Tch designation signal from the communication control station 1 and designates the downlink Tch (communication radio channel) to the mobile stations a1 and a2 using Cch (Cch). ) Send the signal. Similarly, the radio base station 20 specifies downlink Tch (C
ch) Transmit the signal. At this point, the uplink and downlink Tch frequencies have not been allocated to the radio base station 10 and the mobile station a1.

In a specific internal operation of the radio base station 10 at this time, the down-link Tch designation signal from the communication control station 1 is determined by the control signal determination section 203 as group communication permission, and the transmission channel estimation section 209 determines the idle down-channel Tch. Frequency (f11)
Search for. The determined downlink Tch frequency (f11) is
The control signal generator 215 turns the signal into a downlink Tch designation (Cch) signal, which is transmitted by the control channel transmitter 221.

Each mobile station that has received the downlink Tch designation (Cch) signal sets the reception frequency to the designated downlink Tch frequency (f11) and enters a reception standby state.

In the specific internal operation of the mobile station a1 at this time, the signal received by the receiver 117 is determined to be a downlink Tch designation by the control signal determination unit 111 via the switch 114,
The information is transmitted to the communication management unit 106. In the communication management unit 106,
The reception frequency is designated to the reception channel management unit 108, and the reception frequency is set to the designated downlink Tch frequency (f11) by the frequency setting unit 116.

At approximately the same time, the communication control station 1
The transmission right release signal is transmitted to the radio base stations 10 and 20 in association with the designation.

In a specific internal operation of the communication control station 1 at this time, the press-talk communication management unit 308 determines that a transmission zone has not been assigned from information managed by the transmission zone management unit 309, and generates a control signal. Through the part 306,
The transmission right release signal is transmitted to the radio base stations 10 and 20. The radio base stations 10 and 20 receive the transmission right release signal and transmit them to each mobile station as a transmission permission (Tch) signal.

In the specific internal operation of the radio base station 10 at this time, the control signal determination unit 203 determines that the transmission right release signal from the communication control station 1 is the transmission right release, and the control / voice generation unit 213 A transmission permission (Tch) signal is generated, and the communication channel transmitter 2 is assigned to the assigned communication channel.
Sent from 19.

The mobile station a1 that has received the transmission permission (Tch) signal detects the press ON of the communication operation, and transmits a transmission request (Cch) signal to the radio base station 10 using Cch.

In a specific internal operation of the mobile station a 1 at this time, the transmission permission (Tch) signal received by the receiver 117 is determined by the control signal determination unit 111 to determine whether transmission is permitted. Based on this determination, the communication management function 106 sends a transmission request (Cch)
A signal is generated by the control signal generation unit 110 and the switch 113
And, it transmits to the wireless base station 10 via the transmitter 115.

This transmission request (Cch) signal is replaced by a transmission right request signal in the radio base station 10 and the communication control station 1
Transferred to The communication control station 1 performs exclusive control with a transmission right request signal from another radio base station 20 that is performing group communication, and returns a transmission right permission signal to the radio base station 10.

In the specific internal operation of the communication control station 1 at this time, the transmission zone management unit 309 limits the number of mobile stations that can transmit among all the radio base stations participating in the group communication to one. Exclusive control is performed. For the exclusive control, techniques introduced in existing techniques such as first-come first-served priority determination of a transmission request and rank determination of a transmitting mobile station can be adopted.

Here, the radio base station 10 first allocates the uplink Tch frequency (F11) to the mobile station a1. At this time, the radio base station 20 without the transmission right permission transmits the uplink Tch frequency (F11) to the mobile station a3.
Is not assigned. In a specific internal operation of the radio base station 10 at this time, a transmission right permission signal of the communication control station 1 is received, and an uplink Tch designation (Tch) signal is transmitted using the corresponding communication channel transmitter 219. .

The mobile station a1 to be transmitted receives the designated uplink T
channel to transmit a voice signal to the radio base station 10,
Through the press-talk communication loopback unit 314 of the communication control station 1, it becomes a downlink Tch audio signal, which is transmitted from each radio base station to each mobile station, thereby forming a group communication.

The specific operation is as follows. The upstream voice is looped back to the downstream voice signal by the press-talk communication loopback unit 314 of the communication control station 1 via the voice signal path of the mobile station a1 and the radio base station 10. The information is transmitted to the mobile stations a2 and a3 via the radio base stations 10 and 20.

Mobile station a1 completes transmission (press OFF)
If so, the switching flag 408 of the uplink Tch is switched to a control signal, a transmission stop (Tch) signal is transmitted, and transmitted to the communication control station 1 via the radio base station 10. Communication control station 1
Releases the transmission zone and the uplink Tch frequency of the radio base station 10, and sends a transmission right release signal to the radio base stations 10 and 20. Upon receiving the transmission right release signal, the radio base station 10 transmits a transmission permission (Tch) signal on the downlink Tch.
The radio base station 20 also receives the transmission right release signal and
Transmits a transmission permission (Tch) signal.

In this state, the mobile station a2 of the radio base station 20
In, when press ON of the communication operation is detected, a transmission request (Cch) signal is transmitted on the uplink Cch, and the mobile station a1
The transmission right is transferred to the mobile station a2 in the same procedure as when the transmission is performed, and the press-talk communication is configured.

Next, the operation of this embodiment will be described with reference to FIGS.
Can be mainly described.

FIG. 7 shows that, as shown in FIG. 1, mobile stations a1, a2, b1, b2, and b3 of two communication groups a and b exist in each of the radio base stations 10, 20, and 30, and the group communication is performed. This shows the use state of the wireless channel when it is being performed. Regarding the usage status of the wireless channel, the group a of the wireless base station 10 occupies the downlink Tch frequency (f11) and the group a of the wireless base station 20 occupies the downlink Tch frequency (f21). Similarly, f22 and f31 are occupied by the group b of the radio base station 20 and the radio base station 30, and four channels are used in the entire system. In the case of a conventional radio system, the number of radio channels required for the system should be 4ch for each downlink Tch and uplink Tch in a one-to-one relationship.

According to the present embodiment, the number of uplink Tch used as a system is only 2ch (F11, F31). This is because, as described above, in the case of the press talk communication, the transmitting mobile station is one station in the communication group, and can be estimated from the difference in traffic used between the downlink Tch and the uplink Tch.

In this case, in the group communication of the group a, the mobile station a1 of the radio base station 10 and the mobile station a3 of the radio base station 20 perform communication by switching transmission. Similarly, in the case of group b, the mobile station b3 of the wireless base station 30 and the mobile station b2 of the wireless base station 30 perform communication by switching transmission.

At this time, as each radio base station, two receivers may be used, and at the same time, the frequency for uplink Tch as the system may be 2 ch. Therefore, the economic effect and the frequency utilization efficiency as the radio communication system are as follows. This is superior to a conventional wireless communication system.

As described above, in the present embodiment, the scale of the radio communication system is small, and the radio communication channel management for each radio base station corresponds to the case where the reduction effect of the uplink radio channel is small. The common management of the wireless communication channels in units of (1)) can improve the effect of reducing wireless channels.

The reduction amount of the uplink Tch is ultimately determined by the communication traffic of the system. However, in rough calculation, if it is estimated in the case of group communication, the number of radio base stations used simultaneously by group communication is n. In this case, the uplink Tch traffic as seen by all the radio base stations can be said to be 1 / n. In addition, when mobile stations are separately present in different radio base stations in individual communication, the number is reduced to １ ／.

However, in an actual channel allocation plan, a sufficient uplink Tch allocation is required in consideration of a risk factor that uplink Tch traffic is concentrated on a specific radio base station.

[0054]

As described above, according to the present invention, a plurality of radio base stations for accommodating and managing a plurality of uplink radio communication channels and downlink radio communication channels are provided via the plurality of radio base stations by the press talk communication method. Mobile stations that communicate with
And a communication control for managing and controlling transmission requests from the plurality of radio base stations, comprising a network having a plurality of service areas by the plurality of radio base stations and the communication control station; In a press-talk radio communication system for performing radio communication by a multi-channel access technology and a press-talk call switching technology between a radio base station and a mobile station and between mobile stations while moving within,
A wireless digital transmission unit for transmitting and receiving control data between a plurality of mobile stations and a plurality of wireless base stations is provided, and the plurality of wireless base stations and the communication control station are provided with a plurality of wireless base stations and the plurality of communication control stations, respectively. A transmission right control means for controlling a transmission request and exclusively controlling a transmission zone, wherein the plurality of radio base stations synchronize with the on / off of the press operation of the mobile station during communication with the communication control station and the mobile station, respectively. The communication control station includes channel management means for allocating / releasing the uplink wireless communication channel in a time-division manner, wherein the communication control station separately manages the uplink wireless communication channel and the downlink wireless communication channel, and controls the allocation of the uplink wireless communication channel during communication. Wireless channel management means for managing the presence / absence of transmission right of the mobile station , and communication control
The station communicates from each of the plurality of radio base stations.
Communication right management means for managing rights and transmission rights;
Means for looping back communication between wireless base stations, and
Switch communication paths for exchanging voice signals between line base stations
Channel switching / management means for managing multiple wireless base stations
Control signal transmitting / receiving means for transmitting / receiving a fourth control signal;
The transmission and reception channels of multiple radio base stations for each station
Having the transmission / reception channel management means for managing the channel has an effect that the uplink wireless communication channel can be effectively used.

Also, by reducing the number of uplink radio communication channels, it is possible to reduce the number of radio base stations and save radio frequency resources.

[Brief description of the drawings]

FIG. 1 is a system diagram showing a press-talk wireless communication system according to an embodiment of the present invention.

FIG. 2 is a functional block diagram illustrating a mobile station according to the present embodiment.

FIG. 3 is a functional block diagram illustrating a wireless base station according to the present embodiment.

FIG. 4 is a functional block diagram illustrating a communication control station according to the present embodiment.

FIGS. 5A and 5B show a signal format used between a radio base station and a mobile station in the present embodiment, wherein FIG. 5A shows a control signal format and FIG. 5B shows a voice signal format.

FIG. 6 is a diagram showing a control sequence when performing group communication according to the embodiment of the present invention.

FIG. 7 is a diagram showing a management table for storing the use status of uplink Tch and downlink Tch of a radio base station according to an embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Communication control station 10, 20, 30 Radio base station a1, a2, a3, b1, b2, b3 Mobile station 101 Microphone or other audio input unit 102 Switch / operation setting unit 103 Operation / alarm etc. display unit 104 Speaker or other audio output Device 105 Operation processing unit 106 Communication management unit 107 Transmission channel management unit 108 Receiving channel management unit 109 Audio signal generation unit 110 Control signal generation unit 111 Control signal determination unit 112 Audio signal decoding unit 113, 114 Switch 115 Transmitter 116 Frequency setting Unit 117 receiver 118 transmission antenna 119 reception antenna 201, 202 audio signal reception unit 203 control signal determination unit 204 control signal generation unit 205, 206 audio signal transmission unit 207 transmission path switching unit 208 pre-talk communication management unit 209 transmission channel designation unit 210 Receive channel designation unit 2 11 Transmission Right Management Unit 212 Reception Path Switching Unit 213, 214 Control / Sound Generation Unit 215 Control Signal Generation Unit 216 Control Signal Judgment Unit 217, 218 Control / Sound Decoding Unit 219, 220 Communication Channel Transmitter 221 Control Channel Transmitter 222 Control channel receivers 223, 224 Communication channel receivers 225, 226, 227 Transmit antennas 228, 229, 230 Receive antennas 301, 302 Audio signal receivers 303, 304 Audio signal transmitter 305 Control signal determiner 306 Control signal Generation section 307 Communication path switching section 308 Prestalk communication management section 309 Communication zone management section 310 Communication path management section 311 Transmission zone management section 312 Transmission channel management section 313 Reception channel management section 314, 315, 316, 317 Press talk communication return section

Claims (3)

(57) [Claims] 1. A plurality of radio base stations for accommodating and managing a plurality of uplink radio communication channels and a downlink radio communication channel, and a plurality of mobile stations communicating via the plurality of radio base stations in a press talk communication system. A communication control station that manages and controls transmission requests from the plurality of radio base stations, and configures a network having a plurality of service areas by the plurality of radio base stations and the communication control station; A press-talk radio communication system for performing radio communication by a multi-channel access technology and a press-talk call switching technology between the radio base station and the mobile station and between the mobile stations while moving within a plurality of service areas, A wireless digital transmission unit for transmitting and receiving control data between the plurality of mobile stations and the plurality of wireless base stations; The communication control station includes transmission right control means for controlling a plurality of transmission requests between the plurality of radio base stations and the communication control station and performing exclusive control of a transmission zone. And a channel management means for allocating / releasing an uplink wireless communication channel in a time-division manner in synchronization with on / off of a press operation of the mobile station during communication with a mobile station and the mobile station; the uplink wireless communication channel and the downlink wireless communication channel managed separately, a wireless channel management means for managing the presence or absence of transmission right of the allocation control of the uplink wireless communication channel mobile station in the communication in the communication, and the communication control
A station is requested from each of the plurality of radio base stations
Communication right management means for managing communication right and transmission right, and press
Return means for returning the talk communication between the radio base stations,
Communication for exchanging voice signals between the plurality of radio base stations.
Communication path switching and management means for switching and managing communication paths;
Control signal transmission / reception for transmitting / receiving a fourth control signal to / from a plurality of radio base stations.
Receiving means, and the plurality of radio base stations in units of the communication control station.
Transmission and reception channel for managing the transmission and reception channels of the
Press-to-talk wireless communication system; and a panel management unit. 2. The mobile station according to claim 1, wherein each of the plurality of mobile stations independently manages a transmission channel and a reception channel, and an uplink between the mobile station and the radio base station in synchronization with a press operation in a communication state. Generating or determining a first control signal for requesting or releasing a wireless communication channel;
2. The press-talk wireless communication system according to claim 1, further comprising: a generation / determination unit configured to generate an audio signal and the first control signal; 3. Each of the plurality of radio base stations includes a designation unit for designating the transmission channel and the reception channel to the mobile station according to an instruction of the communication control station, and a radio communication channel between the mobile station and the mobile station. Second generation / judgment means for generating or judging a second control signal for requesting or releasing the communication request, and accepting a communication request or a transmission request from the mobile station and requesting the communication control station for a transmission right. And third generation / judgment means for generating or judging a third control signal for giving and receiving permission, and audio generation / decoding for generating or decoding an audio signal.
Decoding means, voice transmitting and receiving means for transmitting and receiving the voice signal for exchanging communication information such as the voice signal with the communication control station, and communication path switching means for switching a transmission path and a reception path; The press-talk wireless communication system according to claim 1, further comprising: