JP2970842B2 - 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 implements a press talk communication between a mobile station moving within a service area of communication covered by a plurality of radio base stations and a communication control station and the radio base station. The present invention relates to a press talk wireless communication system.

[0002]

2. Description of the Related Art As a conventional press-talk radio communication system, a one-pair radio channel is used for radio communication from a mobile station to a radio base station (uplink) and from a radio base station to a mobile station (downlink). A mobile communication system for performing press talk communication has been established in technology, and is widely used in, for example, a public business wireless communication system and a multi-channel access system.

[0003] In this press-talk radio communication system, in response to activation of a communication request from a mobile station or a radio base station, an empty radio channel (unused radio channel) is selected from radio channels managed by the radio communication system. A method is adopted in which communication is performed by allocating in a time-division manner for communication as an uplink and downlink pair wave, and this communication is performed by securing a pair of wireless channels from the start to the end of communication.

[0004]

However, in such a 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. In this case, mobile stations other than the transmitting mobile station are in a receiving state and are not transmitting. Therefore, when this group communication is performed in a range extending 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 at the same time. In a radio base station having only one, the allocated uplink radio channel is not used. Therefore, there is a problem that the use efficiency of the channel is poor.

[0005] In particular, in a business radio system, business contact information is broadcast from a commanding radio base station or mobile station that supervises a communication group to a plurality of mobile stations that receive instructions. 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. Therefore, in the case of command communication from the radio base station to the mobile station, the uplink radio channel is not effectively used in all the radio base stations.

[0006] 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 wireless base stations, only one mobile station is transmitting, and the uplink wireless channel of the wireless base station to which the mobile station in the receiving state belongs is not used.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and cancels the radio channel management in one uplink and one downlink performed by a conventional radio communication system, and establishes an uplink radio channel for each radio base station. By separately managing downlink radio channels and managing the necessity of uplink radio channels for each radio base station, it is possible to reduce the number of required radio channels and thereby to effectively use uplink radio channels. It is an object to provide a talk radio communication system.

[0008]

To achieve the above object,
Press-to-talk wireless communication system according to the invention of claim 1, wherein the radio base and the mobile station to the mobile communication control station and connected thereto a plurality of the service area of the communication network that consists me by the radio base station Between stations
In the Stoke communication state, synchronized with the press talk operation
And allocate / release uplink radio channels in a time-sharing manner
A press-talk wireless communication system,
A station , a mobile station side communication management unit having a transmission channel management function and a reception channel management function, and controlling an uplink radio channel request to the radio base station in synchronization with a press talk operation in a press talk communication state. control signal generating means for sending a signal, transmitted from the radio base station
And determining the control signal determining means for transmitting <br/> authorization to receive control signals Kuru Rino Ue radio channel release, the radio base by switching the control signal or the audio signal of the radio channel request
Comprising: the transmitting side signal switch to be transmitted to the station, and a reception-side signal switch for receiving switching control signals or audio signals of the radio channel release from the radio base station
And

Further, a press talk radio communication system according to the invention of claim 2 provides a communication control station and a communication control station connected thereto.
Communication network consisting of multiple wireless base stations
Mobile station moving within the service area of the
In the press talk communication state with the local station, press
Synchronize with the talk operation, time division of the upstream radio channel
Allocating / releasing press talk wireless communication system
A is, the radio base station, transmission channel and reception
A radio base station-side communication management unit having a transmission channel management function and a reception channel management function for separately managing channels, and a transmitter and a receiver for transmitting and receiving a communication channel and a control channel with the mobile station. , The mobile station
Control / voice generation means for generating, judging and decoding a control signal and an audio signal transmitted and received between the first control signal generation means, first control signal determination means and control / audio decoding means; Receiving a transmission request / stop from the station, requesting / stopping a transmission right with the communication control station and
Second control signal generating means and second control signal determining means for transmitting / receiving permission / release of a transmission right, and an audio signal for exchanging the audio signal with the communication control station Transmitting means, audio signal receiving means, and the audio signal receiving means
A transmission path between the control and the voice generation means and the control
/ Having a transmission path switching means and the receiving path switching means and audio decoding means switching the receive path between the audio signal transmitting unit
It is characterized by that.

[0010] Further, a press-talk radio communication system according to the invention of claim 3 provides a communication control station and a communication control station connected thereto.
Communication network consisting of multiple wireless base stations
Mobile station moving within the service area of the
In the press talk communication state with the local station, press
Synchronize with the talk operation, time division of the upstream radio channel
Allocating / releasing press talk wireless communication system
A is, the communication control station, and a communication control station side communication management unit having a function of managing the communication right and transmission right requested from the radio base station, a press-to-talk communication between said radio base station Press-talk communication returning means for returning, communication path switching means for exchanging voice signals and the like with the wireless base station, and control signal determining means for determining a control signal from the wireless base station and controlling communication permission. And from the mobile station
A transmission request and transmission transmitted through the radio base station.
Control signal generation means for generating a transmission right permission and a transmission right release in response to the communication suspension and supplying the transmission right permission and the transmission right release to the radio base station,
It is characterized by having.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a conceptual diagram showing the whole of a press-talk radio communication system according to the present invention.
Is a plurality (three in this case) of radio base stations connected to the communication control station 4, 12 is a mobile station transmitting to the radio base station 1,
Reference numeral 11 denotes a receiving mobile station, 21 and 22 denote mobile stations that receive the radio base station 2, and 31 and 32 denote mobile stations that receive the radio base station 3. Note that the number of wireless base stations and mobile stations can be increased or decreased depending on the form of communication, thereby realizing group communication or individual communication.

FIG. 2 shows each of the mobile stations 11, 12, and 2.
FIG. 3 is a block diagram showing details of 1, 22, 31, and 32;
In the drawing, reference numeral 41 denotes a mobile station side communication management unit having a transmission channel and reception channel management function and a communication management function; 42, an operation setting unit by operating a switch such as a press talk switch; and 43, an operation alarm. Display means for performing the operation, 44 is a sound input means such as a microphone, 45 is a sound output means such as a speaker, and 46 is an operation processing means for executing operation processing of input of the operation setting means 42 and output of the display means 43.

A control signal generating means 47 generates a control signal for requesting an uplink radio channel with the radio base stations 1 to 3 in synchronization with the press talk operation.
8 is a control signal determining means for determining a control signal for releasing a wireless channel in synchronization with the press talk operation, 49 is an audio signal generating means for generating an audio signal to be transmitted, 50
Are audio signal decoding means for decoding the received audio signal, 5
Reference numerals 1 and 52 denote a transmission-side signal switch and a reception-side signal switch for selectively transmitting or receiving each of the control signals and the audio signal.

Further, 53 is a transmitter for transmitting a radio channel request via the transmitting antenna 54, and 55 is a receiving antenna 5
A receiver 57 for receiving a transmission permission signal and the like via 6 is frequency setting means for setting the frequency of each transmitter 53 and receiver 55.

FIG. 3 is a block diagram showing details of the radio base stations 1 to 3. In FIG. 3, reference numeral 61 denotes a transmission channel management function for separately managing a transmission channel and a reception channel, a reception channel management function, and a press talk. The radio base station-side communication management units 62-1 to 62-N and 63-1 to 63-N having a communication right management function and a transmission right management function transmit transmission antennas 64-1 to 64 with the mobile station 11, for example. -N
And a communication channel transmitter as a transmitter and a communication channel receiver as a receiver for transmitting and receiving a communication channel via the receiving antennas 65-1 to 65-N;
66 and 64 are a transmitting antenna 68 and a receiving antenna 69
A control channel transmitter as a transmitter for transmitting and receiving a control channel to and from the mobile station 11 via the mobile station 11, and a control channel receiver as a receiver.

Also, 70-1 to 70-N generate a control signal such as a transmission permission signal and a voice signal based on the output of the radio base station side communication management section 61, and transmit this to the communication channel transmitter 62-1. Control / sound generating means for outputting to .about.62-N, 71-1 to 71-N are communication channel receivers 63
Control / audio decoding means for decoding signals from -1 to 63-N into control signals and audio signals; 72, a control signal generation means for generating a control signal and supplying it to the control channel transmitter 66; Control signal determination means for determining a group transmission request based on a signal from the channel receiver 67.

Further, reference numerals 74-1 to 74-N denote audio signal receiving means for receiving an audio signal from the communication control station 4;
Reference numerals 1 to 75-N denote audio signal transmitting means for transmitting an audio signal to the communication control station 4;
A control signal generation unit and a control signal determination unit that generate a control signal such as a group communication request signal and determine a control signal such as a transmission right release signal between the communication control unit 1 and the communication control unit 4. 78 is an audio signal receiving means 74-1 to 74-N
Transmission line switching means for switching the transmission path between the control / audio generation means 70-1 to 70-N, and the control / audio decoding means 71-1 to 71-N and the audio signal transmission means 75-1
This is a receiving path switching means for switching the receiving path between the receiving path and the destination path.

FIG. 4 is a block diagram showing details of the communication control station 4. Reference numeral 81 denotes a communication zone management function and a transmission zone management function for managing a communication right and a transmission right requested from the radio base stations 1-3. A communication control unit side communication management unit having a press talk communication management function and a communication path management function, 8
Reference numeral 2 denotes a control signal determination unit that determines a control signal such as a group communication request determination signal and controls communication permission, 83 denotes a control signal generation unit that generates a control signal such as a group communication permission signal, and 84-1 to 84-N Is a press-talk communication return means for returning the press-talk communication between the wireless base stations 1, 2, 3; 85-1 to 85-N are a plurality of audio signal receiving means;
Reference numerals 86-1 to 86-N denote a plurality of audio signal transmitting means, and 87 denotes a communication path switching means for exchanging audio signals and the like with the radio base stations 1 to 3.

FIGS. 5 and 6 show signal formats of a control signal and a voice signal used for requesting and setting communication or transmission between a mobile station and a radio base station.

Next, the operation of the communication control according to the present invention will be described.
This will be described in detail with reference to the control sequence diagram of FIG. Here, a communication control procedure when a request for group communication is made from the mobile station 12 belonging to the wireless base station 1 is shown.

First, a group communication request is transmitted from the transmitting mobile station 12 to the radio base station 1 via a control radio channel. That is, specifically, the mobile station 12
This operation is transmitted to the communication management function of the mobile station side communication management unit 41 through the operation of the operation setting means 42 of the mobile station 12 by the communication operator and the judgment of the operation processing means 46. This communication management function determines that the operation of the communication operator is a group communication request, generates a group communication request signal by the control signal generation means 47, enters the transmitter 53 via the transmission side signal switch 51, and It is transmitted as a control signal via the antenna 54. At this time, the transmitter 53 and the receiver 5
5 is set to the channel C by the frequency setting means 57.
ch is set.

Subsequently, the communication request from the mobile station 12 is received by the radio base station 1, where it is determined to be a communication request, and further transmitted to the communication control station 4 as a new communication request. That is, specifically, the operation of the radio base station 1 is such that the signal from the mobile station 12 is received by the control channel receiver 67 via the reception antenna 69 and the control signal determination means 7
3 to determine a new communication request by the pre-storage communication management function of the wireless base station side communication management unit 61. Then, the control signal generation unit 76 requests the communication control station 4 to perform a group communication request. Generate a signal,
It transmits to this communication control station 4.

On the other hand, the communication control station 4 receives the transmission information, determines whether or not the communication can be permitted.
The group communication permission is sent to the wireless base station 1 and the wireless base station 2. That is, specifically, in the communication control station 4, the request signal of the radio base station 1 is transmitted to the control signal determination unit 82.
Then, the request is determined to be a group communication request, and the result is sent to the Pre-Stalk communication management function of the communication control station side communication management unit 81.
Here, the system resources such as the communication zone and the communication path are determined from the communication group information.
The control signal generating means 83 generates a group communication permission and sends it to the wireless base station 1 and the wireless base station 2. Here, a case is shown where the wireless base stations 1 and 11 and the mobile stations 11 and 12 and the wireless base station 2 and the mobile station 21 are each one communication group.

Subsequently, the radio base station 1 transmits a channel Cc to the transmitting mobile station 12 and the receiving mobile station 11.
h is used to specify the downlink channel Tch (F11) for communication. Similarly, the radio base station 2 receives the mobile station 2
For 1, the downlink channel Tch (F12) is designated. At this time, in all the radio base stations 1 and 2 and the mobile stations 11, 12, and 21, the uplink channel Tch (f1
1) is not assigned. That is, specifically,
In the operation of the radio base station, the signal from the communication control station 4 is judged to be permitted to group communication by the control signal judging means 77, and the transmission channel management function of the communication management section 61 of the radio base station uses the idle downlink channel Tch (F11). Search for. The determined downlink Tch (F11) becomes the downlink channel Tch designation (F11) by the control signal generation means 72, and is transmitted from the control channel transmitter 66 via the transmission antenna 68.

Next, the downlink channel Tch (F1
1) Each of the mobile stations 11, 12, and 21 receiving the designation by the receiver 55 via the reception antenna 56 sets the reception frequency to the designated downlink channel Tch (F11) and enters a standby state. That is, specifically, in the operation of the mobile station, the signal received by the receiver 55 is transmitted to the receiving-side signal switch 5.
2, the control signal determining means 48 outputs the downlink channel Tch
(F11) is determined and transmitted to the communication management function of the mobile station side communication management unit 41. In this communication management function, the reception frequency is designated in the reception channel management function, and the frequency setting means 5
7, the reception frequency is designated by the downlink channel Tc.
Set to h frequency (F11).

The communication control station 4 transmits the transmission right release to the radio base stations 1 and 2 almost simultaneously with the designation of the downlink channel Tch. That is, specifically, in the operation of the communication control station 4, the press talk communication management function determines from the information in the transmission zone management function that there is no transmission zone, passes through the control signal generation unit 83, and wirelessly releases the transmission right. It is transmitted to base stations 1 and 2.

The wireless base stations 1 and 2 receive the transmission right release, switch the downlink channel Tch to a control signal (see FIG. 6), and transmit a transmission permission signal to each mobile station. That is, in the radio base stations 1 and 2, the signal from the communication control station 4 is determined to be release of the transmission right by the control signal determination unit 77 and is transmitted by any of the control / voice generation units 70-1 to 70 -N. A permission signal is generated and transmitted via any of the assigned communication channel transmitters 62-1 to 62-N via the transmission antennas 64-1 to 64-N.

The mobile station 12 that has received the permission signal detects that the press-talk switch of the communication operation is ON, and sends a transmission request to the wireless base station 1 using the channel Cch. That is, in the mobile station 12, the signal received by the receiver 55 is determined by the control signal determination unit 48 as transmission permission. Based on this determination, the communication management function of the mobile station side communication management unit 41 generates a transmission request by the control signal generation unit 47 and transmits it to the wireless base station 1 via the switch 51 and the transmitter 53.

The transmission request from the mobile station 12 is transferred to the communication control station 4, where exclusive control is performed with request signals from other radio base stations 11, 21 and the like, and the transmission right is granted and the radio is transmitted. Instructed by the base station 1. That is, the communication control station 4
In the transmission zone management function, exclusive control is performed between the radio base stations 1 and 2 participating in the group communication so that the transmission base station 12 finally becomes one transmission mobile station 12. For this exclusive control, a technique introduced in existing techniques, such as a first-come-first-serve determination of a transmission request and a rank determination of a transmitting mobile station, can be employed.

In the radio base station 1, the mobile station 1
2 is assigned to the upstream channel Tch (f11). At this time, in the wireless base station 2 for which the transmission right is not granted,
The uplink channel Tch (f11) is not allocated to the mobile station 21. That is, specifically, the radio base station
In 1, it receives the transmission right grant communication control, retrieves the empty uplink channel Tch (f11) on the receiving channel management function, by using one of the communication channel transmitters 62-1 to 62-N, The uplink channel Tch (f11) is transmitted.

The transmitting mobile station 12 transmits a voice signal to the radio base station 1 using the designated uplink channel Tch, and transmits the voice signal of the downlink channel Tch through the press-talk return function of communication control. A signal is transmitted from each of the radio base stations 1 and 2 to each of the mobile stations 11, 12 and 21, thereby forming a group communication. That is, via the path of the audio signal of the mobile station 12 and the radio base station 1, any one of the press-talk communication return means 84-1 to 84-N of the communication control station 4 returns the upstream voice signal to the downstream voice signal. The data is transmitted to the mobile stations 11 and 21 via the radio base stations 1 and 2.

Mobile station 11 ends transmission (press OFF)
In this case, the transmission stop is transmitted by the control signal of the uplink channel Tch and transmitted to the communication control station 4 via the radio base station 1. The communication control station 4 releases the transmission zone of the radio base station 1 and sends a transmission right release to the radio base stations 1 and 2. In response to the release of the transmission right, the radio base station 1 releases the uplink channel Tch and transmits a transmission permission on the downlink channel Tch. The wireless base station 2 also receives the transmission right release and sends a transmission permission on the downlink channel Tch. In this state, when the mobile station 21 on the side of the radio base station 2 detects the press ON of the communication operation, it transmits a transmission request on the uplink channel CcH, and the transmission right is granted to the mobile station 21 in the same procedure as when the mobile station 12 transmits. Then, press talk communication is configured.

FIG. 8 shows a radio channel management table according to the present invention, in which mobile stations of a plurality of communication groups exist in a radio base station, and a plurality of group communications and a plurality of individual communications are performed. The state is shown. In this figure, the wireless base station has 5 downlink channels Tch and performs communication by multi-channel access, but the uplink channel Tch can be satisfied by 2 channels. This is because, in the case of the press talk communication as described above, the transmitting mobile station is a communication group (group a, d,
e, f, g, i, etc.), and the downlink channel T
It can be estimated from the difference in traffic used between the channel and the uplink channel Tch.

In this case, the radio base station can be used, and three receivers can be reduced. At the same time, three frequencies for the uplink channel Tch can be saved, and the economic effect and frequency utilization efficiency of the radio communication system are reduced. This is superior to a conventional wireless communication system. Further, the reduction amount of the upper channel Tch as described above is ultimately determined by the communication traffic of the system. However, in rough calculation, when it is estimated in the case of group communication, the radio base stations used simultaneously by group communication are estimated. If the number of stations is n, the uplink channel Tc as seen from all radio base stations
The traffic of h can be said to be 1 / n. Also, if mobile stations exist separately in different radio base stations in individual communication,
It becomes 1/2. However, in an actual channel allocation plan, a sufficient uplink Tch allocation is required in consideration of a risk factor that the uplink channel Tch traffic is concentrated on a specific radio base station.

[0035]

As described above, according to the present invention, the uplink radio channel and the downlink radio channel are separately managed for each radio base station, and the necessity of the uplink radio channel is managed for each radio base station. Thus, it is possible to effectively use the uplink radio channel, and therefore, it is possible to reduce the number of radio channels. As a result, it is possible to reduce the equipment cost of the radio base station and save the radio frequency resources.

[Brief description of the drawings]

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

FIG. 2 is a block diagram showing details of a mobile station in FIG.

FIG. 3 is a block diagram showing details of a radio base station in FIG. 1;

FIG. 4 is a block diagram illustrating details of a communication control unit in FIG. 1;

FIG. 5 is a signal format diagram of a control signal used between a radio base station and a mobile station in the present invention.

FIG. 6 is a format diagram of a voice signal used between a radio base station and a mobile station in the present invention.

FIG. 7 is a control sequence showing a control procedure of group communication according to the present invention.

FIG. 8 is a management table diagram showing the use status of the uplink channel in the present invention.

[Explanation of symbols]

 1, 2, 3 Radio base station 4 Communication control station 11, 12, 21, 22, 31, 32 Mobile station 41 Mobile station side communication management unit 47 Control signal generation unit 48 Control signal determination unit 51 Transmission side signal switch 52 Reception Side signal switch 61 Radio base station side communication management unit 62-1 to 62-N Communication channel transmitter (transmitter) 63-1 to 63-N Communication channel receiver (receiver) 66 Control channel transmitter (Transmitter) 67 Control channel receiver (Receiver) 70-1 to 70-N Control / speech generation means 71-1 to 71-N Control / speech decoding means 72 Control signal generation means 73 Control signal determination means 74- 1-74-N audio signal receiving means 75-1 to 75-N audio signal transmitting means 76 control signal generating means 77 control signal determining means 78 transmission path switching means 79 reception path switching means 81 communication control station Communication management unit 82 a control signal judging unit 83 a control signal generating means 84-1~84-N press-to-talk communication fold means 87 communication path switching means

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁶ , DB name) H04B 7/26-7/26 102 H04Q 7/00-7/38

Claims (3)

(57) [Claims] 1. A between the mobile station moving within the service area of the communication network formed by the communication control station and connected thereto a plurality of radio base stations and the radio base station, the press-to-talk communication state, Press talk operation
Synchronizes with the operation of the
Meet our press-to-talk wireless communication system to rely / release
Te, the mobile station, the mobile station-side communication management unit having a transmit channel management and receive channel management function, the press-to-talk communication, in synchronization with the press-to-talk operation, uplink radio to the radio base station control signal generating means for delivering a control signal of channel request, and determines a control signal determining means for transmitting authorization to receive a control signal on Rino radio channel release transmitted from the radio base station, the radio a transmitting side signal switch to be transmitted to the radio base station switches the control signal or the audio signal of the channel request, the reception-side signal switching for receiving switching control signals or audio signals of the radio channel release from the radio base station And a press-talk radio communication system. 2. A press talk communication state between a mobile station moving within a service area of a communication network constituted by a communication control station and a plurality of radio base stations connected thereto and said radio base station , Press talk operation
Synchronizes with the operation of the
Meet our press-to-talk wireless communication system to rely / release
Te, the radio base station, a radio base station side communication management unit having a transmit channel management and receive channel management function to manage separately transmit and receive channels, communication channels and control between the mobile station generating a transmitter and receiver for exchanging use channel, control signals and audio signals are exchanged between the mobile station, determining and decoding controls / audio generating means, first
Control signal generating means, the first control signal determining means and the control / audio decoding means, the receiving a transmission request / stop transmitting from the mobile station, the transmission right request / stop and transmitted between the communication control station Grant of rights
/ Second control signal generating means for giving / receiving the release
A second control signal determining unit; an audio signal transmitting unit and an audio signal receiving unit for exchanging the audio signal with the communication control station; and a unit between the audio signal receiving unit and the control / audio generating unit. feed and of <br/> transmission path and the control / audio decoding means the audio signal
A press-talk radio communication system, comprising: a transmission path switching unit for switching a reception path between transmission units; and a reception path switching unit. Wherein between a mobile station moving within the service area of the communication network formed by the communication control station and connected thereto a plurality of radio base stations and the radio base station, the press-to-talk communication state, Press talk operation
Synchronizes with the operation of the
Meet our press-to-talk wireless communication system to rely / release
Te, said communication control station, folded back and the communication control terminal side communication management unit having a function of managing the communication right and transmission right requested from the radio base station, a press-to-talk communication between said radio base station Press Talk communication return means, communication path switching means for exchanging voice signals and the like between the wireless base station, control signal determination means for determining a control signal from the wireless base station and controlling communication permission, A transmission transmitted from the mobile station through the radio base station
Transmission right permission and transmission right according to request and transmission suspension
Control signal generating means for generating a release and supplying the release to the radio base station.