JP2009302605A - Group communication method, group communication system, and mobile station used for the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable a mobile station during performing group communication to select whether or not new group communication is performed when the new group communication is set for the mobile station. <P>SOLUTION: Upon receiving a request of setting of new group communication while group communications are performed, a line control device 12 generates a group communication calling signal including identification information of a group to perform the new group communication. Radio base stations 13<SB>1</SB>-13<SB>n</SB>distribute the group communication calling signal including the identification information of the group performing new group communication in both PCH(paging channel) of a control channel and ACCH(accessary control channel) of a communication channel. A mobile station 2 receives information for calling the new group at the ACCH of the communication channel, and confirms the group communication information with characters. The mobile station can automatically select whether or not to perform new group communications based on the identification information of a group included in the received group communication calling signal. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a group communication method, a group communication system, and a mobile station used therefor, and more particularly to a group communication method, a group communication system that allows a plurality of mobile stations to perform group communication using a communication channel, and a mobile station used therefor.

  In a mobile communication system, in a radio channel between a radio base station and a mobile station, a control table is connected to a plurality of mobile stations via the radio base station based on a multi-channel access method having a communication channel and a control channel. So-called group communication, which is a one-to-n communication mode for communication, is possible. In a mobile communication system (hereinafter also referred to as a group communication system) that performs this group communication, when a new group communication setting occurs in the system, the radio base station stands by on the general call channel (PCH) of the control channel. A group communication call signal indicating that there is a group communication connection request is transmitted to the mobile station in the middle. However, since the mobile station in group communication is communicating on the communication channel, the group communication call signal transmitted on the control channel cannot be received.

  Therefore, the line control device transmits a notification that there is a connection request for group communication to the mobile station that is communicating through the radio base station through the communication channel, and the mobile device that belongs to the group that is already performing communication operation through the communication channel. There has been known a group communication calling device that pulls a station into group communication and puts a call of a mobile station already in communication on hold while the mobile station is connected to the group communication (for example, see Patent Document 1).

Japanese Patent Laid-Open No. 10-41884

  However, in the group communication calling device described in Patent Document 1, the mobile station in the preceding group communication is automatically drawn into the subsequent group communication and holds the preceding group communication, and either group communication is selected. I do not have such means. For this reason, in the call device for group communication described in Patent Document 1, even when the preceding group communication is a higher priority communication than the subsequent group communication, the preceding group communication having a higher priority is temporarily interrupted, Communication must be waited until the subsequent group communication is completed, and only the group communication of the group to which the desired mobile station belongs cannot be selected.

  The present invention has been made in view of the above points. When a new group communication is set for a mobile station in group communication, a group that can select whether or not to perform a new group communication in the mobile station. An object is to provide a communication method, a group communication system, and a mobile station used therefor.

  In order to achieve the above object, a group communication method of the present invention provides a control station having a plurality of radio base stations between a plurality of radio base stations and a plurality of mobile stations. In a group communication method for performing group communication using a wireless line, if there is a new group communication setting request to the control station during group communication between the control station and a plurality of mobile stations, a group communication call signal is sent. A plurality of movements from each of a plurality of radio base stations are generated on both a general paging channel of a control channel and an associated control channel of a communication channel by a signal generation step to be generated and a group communication paging signal including identification information of the generated group. A group communication call signal transmission step for transmitting to the station, and a plurality of mobile stations currently receiving the group communication call signal and currently receiving the group communication call signal. A selection step for selecting whether or not to perform a new group communication based on the received group communication call signal instead of the current group communication, and a new group communication based on the group communication call signal in the selection step. A step of switching a communication channel between the control station and the mobile station to perform new group communication when it is selected to perform instead of communication.

In order to achieve the above object, the group communication system of the present invention includes a control station having a plurality of radio base stations, wherein two or more radio base stations among a plurality of radio base stations and a plurality of mobile stations are connected. In a group communication system that performs group communication using a wireless line between,
In the group communication with a plurality of mobile stations, the control station includes a signal generation means for generating a group communication call signal when a new group communication setting request is issued to the control station, and a generated group Group communication call signal transmission means for transmitting a group communication call signal including identification information of each of a plurality of radio base stations to a plurality of mobile stations on both the general call channel of the control channel and the associated control channel of the communication channel; A communication path switching means for switching a communication channel with a mobile station to perform a new group communication,
The mobile station currently performing the group communication receives the group communication call signal transmitted from the control station, and determines whether or not to perform new group communication based on the received group communication call signal instead of the current group communication. When the reception / selection means to be selected and the reception / selection means selected to perform a new group communication by the group communication call signal instead of the current group communication, the communication channel is switched with the control station. A new group communication is performed.

  Furthermore, in order to achieve the above object, the mobile station of the present invention includes a control station that performs group communication with a control station having a plurality of radio base stations using a radio channel during group communication. Based on group identification information included in the received group communication call signal and group communication call signal receiving means for receiving the group communication call signal transmitted from both the general call channel of the control channel and the associated control channel of the communication channel. The selection means for selecting whether or not to perform the new group communication in place of the current group communication, and the selection means for performing the new group communication in response to the group communication call signal in place of the current group communication. When selected, the communication channel is switched with the control station to perform new group communication.

  According to the present invention, when a new group communication is set for a mobile station in the group communication, whether or not a new group communication is performed in the mobile station is determined by the group included in the received group communication call signal. Can be selected based on the identification information.

  Next, embodiments of the present invention will be described in detail with reference to the drawings.

  1 is a system configuration diagram of an embodiment of a group communication system according to the present invention, FIG. 2 is a block diagram of an example of a line control device in FIG. 1, and FIG. 3 is an example of a radio base station in FIG. FIG. 4 shows a block diagram of an embodiment of the mobile station of the present invention.

In FIG. 1, the group communication system includes a control station 1 and m mobile stations 2 ₁ to 2 _m (m is a natural number of 2 or more), and the control station 1 and the mobile stations 2 ₁ to 2 _m communicate with each other. Group communication in a one-to-n communication format using a time division multiple access (TDMA) system using ACCH (accompanying control channel) and PCH (simultaneous call channel) as a control channel.

The control station 1 includes a control table 11, a line control device 12, and n (n is a natural number of 2 or more) radio base stations 13 _{1 to} 13 _n . The control table 11 is a device for man-machine interface, and makes a group communication call request for an arbitrary group. Note that a call request by group communication may be made by a request from any of the mobile stations 2 ₁ to 2 _m . The line control device 12 controls the entire wireless line. The wireless base stations 13 _{1 to} 13 _n perform wireless communication with a mobile station located in an area where the wireless communication can be performed among the mobile stations 2 ₁ to 2 _m . Each of the mobile stations 2 _{1 to} 2 _m performs radio communication only with the nearest one radio base station.

  As shown in the block diagram of FIG. 2, the line control device 12 includes a receiving unit 121 that receives a call request from the control table 1, a communication path switch 122 for forming a communication path necessary for group communication, The voice processing unit 123, the voice signal transmitting / receiving unit 124 connected to the voice processing unit 123, the control unit 125 that comprehensively controls the entire line control device 12, the control signal processing unit 126, and the control signal processing unit And a control signal transmission / reception unit 127 connected to.

Further, the radio base stations 13 _{1 to} 13 _n in FIG. 1 have the same configuration, for example, the configuration shown in the block diagram of FIG. 3, a radio base station 13 (any one of 13 _{1 to} 13 _{n in} FIG. 1) includes an interface 131 that transmits and receives a voice signal and a control signal to and from the line control device 12, a signal processing unit 132, and a radio The unit 133, the controller 134, and the transmission / reception antenna 135 are configured.

  The signal processing unit 132 performs signal processing for distributing group communication information on the control channel PCH (simultaneous call channel) and the communication channel ACCH (accompanying control channel) for the output audio signal of the interface 131. The audio signal of the received communication channel is processed. The wireless unit 133 performs wireless communication with the nearest mobile station via the transmission / reception antenna 135 by the TDMA method using PCH or ACCH. The control unit 134 is supplied with the control signal output from the interface 131 and is also supplied with the control signal in the received signal from the mobile station 2 to control the entire radio base station 13 in an integrated manner.

Further, the mobile stations 2 ₁ to 2 _m in FIG. 1 have the same configuration, for example, the configuration shown in the block diagram of FIG. In FIG. 4, the mobile station 2 (any one of 2 ₁ to 2 _{m in} FIG. 1) includes a transmission / reception antenna 20, a control unit 21 that controls the mobile station 2 in an integrated manner, an input unit 22 such as a numeric keypad, and a program And a storage unit 23 that stores telephone directory data and the like, a wireless unit 24 that wirelessly communicates with any of the nearest wireless base stations 13 _{1 to} 13 _n via the transmission / reception antenna 20, a signal processing unit 25, The voice processing unit 26, the voice input / output unit 27, the display driving unit 28, and the display unit 29 are provided.

  The signal processing unit 25 performs predetermined signal processing on the dial signal or character data from the control unit 21 or the transmission voice signal obtained by the voice input / output unit 27 from the voice processing unit 26, and sends the signal to the radio unit 24. Supply as a transmission signal. The signal processing unit 25 outputs character data and group communication information obtained by performing predetermined signal processing on the signal received by the radio unit 24 to the control unit 21, and also receives the received voice signal as a voice. This is supplied to the voice input / output unit 27 via the processing unit 26.

  The voice input / output unit 27 includes a microphone that performs acoustic-electrical conversion on a transmitted voice signal, and a speaker that generates a sound by converting the received voice signal into an electric signal. The voice processing unit 26 performs predetermined voice processing on the transmission voice signal from the microphone in the voice input / output unit 27 and supplies the signal to the signal processing unit 25, and the received voice signal from the signal processing unit 25 On the other hand, predetermined audio processing is performed and output to a speaker in the audio input / output unit 27. The display driving unit 28 performs predetermined known display processing on the display signal from the control unit 21 and causes the display unit 29 to display the display signal.

  Based on the program stored in the storage unit 23 and information related to group communication, the mobile station 2 configured as described above is based on information on another group communication newly requested by the control unit 21 during group communication. A process of selecting whether or not to perform the newly requested group communication, and based on the selection result, continue the group communication currently being communicated or switch to the newly requested group communication. There is a feature.

The information related to the group communication includes a group in which the mobile station participates, a communication priority of the group (priority), and the like. That is, the mobile station 2 (2 ₁ to 2 _m ) can belong to an arbitrary plurality of groups among a large number of groups. For example, in the case of a mobile station installed in an elementary school with a disaster prevention radio, there are (i) elementary school group, (ii) school group, (iii) district group, (iv) evacuation site group, etc. . Here, there are two types of processes for selecting whether or not to perform the newly requested group communication. Each of these processes will be described below as the first embodiment and the second embodiment.

(First embodiment)
Next, the operation of the first embodiment of the present invention will be described together with the sequence diagrams of FIGS. 1 to 4 and FIG. Now, it is assumed that group communication is performed between the control table 11 and any _{one of the} mobile stations 2 a to 2 g among the mobile stations 2 ₁ to 2 _m (step S 1 in FIG. 5). It is assumed that a new group communication setting request is received from the control console 11 during this group communication (step S2 in FIG. 5).

2, the control unit 125 receives a new group communication setting request via the receiving unit 121, and the control signal processing unit 127 performs new group communication on the control channel. A group communication call signal including group identification information is generated and output to the radio base stations 13 _{1 to} 13 _n via the control signal transmission / reception unit 128, and at the same time, a new group communication is performed on the communication channel by the voice processing unit 123. The group communication call signal including the identification information of the group to be performed is generated and output to the radio base stations 13 _{1 to} 13 _n via the voice signal transmitting / receiving unit 124 (step S3 in FIG. 5). Here, “group communication information distribution setting” in step S3 of FIG. 5 is a group communication call signal including identification information of a group for performing new group communication, which is generated in each of the control channel and the communication channel. Output to the radio base stations 13 _{1 to} 13 _n .

The radio base stations 13 _{1 to} 13 _n configured as shown in FIG. 3 send the group communication call signal including the identification information of the group performing the new group communication input as the control signal of the control channel through the interface 131 to the control unit 134. At the same time, the group communication call signal including the identification information of the group performing the new group communication, which is input as the voice signal of the call channel, is supplied to the signal processing unit 132.

As a result, the radio unit 133 transmits a signal from the control unit 134 to a mobile station located in the communication area of the radio base station 13 among all the mobile stations 2 ₁ to 2 _m under the control station 1. Based on the control channel PCH, the group communication call information is generated and distributed through the transmission / reception antenna 135, and the group communication call information is also generated and transmitted on the communication channel ACCH based on the signal from the signal processing unit 132. Distribution is performed through the antenna 135 (steps S4 and S5 in FIG. 5). As a result, even in the mobile stations 2 _{1 to} 2 _m of the mobile stations 2 _{1 to} 2 _m , the information on the new group communication call is received on the ACCH of the call channel, and the group communication information is converted to text or the like. (Step S6 in FIG. 5).

  Subsequently, each control unit 21 shown in FIG. 4 in the mobile stations 2a to 2g that are currently performing group communication identifies a group that is to newly perform group communication, which is included in the received group communication call information. It is compared whether the information matches the group identification information stored in the storage unit 23 (step S7 in FIG. 5).

  If they match, the control unit 21 switches the call channel from the call channel currently in group communication to the call channel for newly performing group communication, which is included in the received group communication call information (step in FIG. 5). S8).

  As a result, the mobile station that has obtained a coincidence comparison result in step S7 subsequently shifts from the call channel that was in the group communication to the call channel that performs the new group communication, and the newly requested group Together with other mobile stations belonging to the group performing communication, group communication is started on the communication channel corresponding to the communication path already set for group communication by the communication path switch 122 (step S11 in FIG. 5). Note that if a mismatched comparison result is obtained in step S7, the mobile station continues the group communication currently being communicated (step S12 in FIG. 5).

  Accordingly, for example, the mobile station 2a belongs to the group A composed of the mobile stations 2b, 2c, and 2d and the group B composed of the mobile stations 2e, 2f, and 2g, and the mobile station 2a belongs to the group A. When group communication is performed together with 2c and 2d, if there is a new group communication group B setting, together with the mobile stations 2e, 2f, and 2g belonging to group B for which a new group communication request has been made Transition to group B group communication. At this time, the group A group communication is continued with the mobile stations 2e, 2f, and 2g only by leaving the mobile station 2a. In this case, the control station 1 does not need to know which mobile station is the receiving station in the group A and group B, and the group A is continued, so there is no need to issue a holding tone.

  Thus, in this embodiment, whether or not to perform new group communication in the mobile station can be automatically selected based on the group identification information included in the received group communication call signal. That is, in this embodiment, when there is a request for new group communication to the mobile stations 2a to 2g in group communication, the group communication call signal is not automatically entered into the new group communication. Based on the identification information of the included group, the mobile stations 2a to 2b select and enter only the group communication of the group to which the mobile station 2a belongs, so that the group communication that has been performed is not put in a suspended state, Practical group communication can be performed.

(Second Embodiment)
Next, the operation of the second embodiment of the present invention will be described together with the sequence diagrams of FIGS. 1 to 4 and FIG. In FIG. 6, the same steps as those in FIG. 5 are denoted by the same reference numerals. In the present embodiment, the communication unit 2 of the mobile station 2 (2 ₁ to 2 _m ) illustrated in FIG. 4 stores in advance communication priorities of two or more groups to which the own terminal belongs.

Now, it is assumed that group communication is performed between the control table 11 and any one of the mobile stations 2a to 2g among the mobile stations 2 ₁ to 2 _m (step S1 in FIG. 6). It is assumed that a new group communication setting request is received from the control console 11 during this group communication (step S2 in FIG. 6).

Then, as in the first embodiment, group communication information distribution is set from the line control device 12 to the radio base stations 13 _{1 to} 13 _n (step S3 in FIG. 6), and the radio base station 13 ₁ radio unit 133 of the to 13 _n delivers through transmitting and receiving antenna 135 and generates information of the group communication call at ACCH of PCH and the communication channel control channel (steps S4, S5 in FIG. 6). Thus, also in the mobile station 2a~2g the current group during communication of the mobile station 2 ₁ to 2 _m, the information of the new group communication call at ACCH traffic channel is received and confirms the group communication information (Step S6 in FIG. 6).

  Subsequently, unlike the first embodiment, each control unit 21 shown in FIG. 4 in the mobile stations 2a to 2g that are currently in the group communication includes the new information included in the received group communication call information. The group performing the group communication determines which of the group priorities stored in advance in the storage unit 23 is the current group priority and which is higher (which group communication priority is higher). (Step S15 in FIG. 6). Here, the priority of the group is set higher, for example, as the group performs group communication with higher urgency and importance.

  When a comparison result is obtained that the priority of the group for which the group communication is newly requested is higher than the priority of the group currently performing the group communication, the control unit 21 sets the call channel to the current group communication. The communication channel is switched to the communication channel for newly performing group communication included in the received group communication call information (step S16 in FIG. 6).

  As a result, after that, in step S15, the mobile station that has obtained a comparison result indicating that the priority of the group of the newly requested group communication is higher than the priority of the group currently performing the group communication. The call channel that has been in group communication is changed to a call channel that performs group communication, and together with other mobile stations that belong to the group that performs the newly requested group communication, the communication path switch 122 has already been used for group communication. Group communication is started on the communication channel corresponding to the set communication path (step S17 in FIG. 6).

  If it is determined in step S15 that the priority of the group for which group communication is newly requested is lower or the same as the priority of the group currently in group communication, the movement is performed. The station continues the group communication currently being performed (step S18 in FIG. 6).

  Thus, in this embodiment, when there is a request for new group communication to the mobile stations 2a to 2g in group communication, the mobile station 2a does not automatically enter into new group communication. If a comparison result is obtained that ˜2g is lower or the same as the priority of the group that is newly requested for group communication than the priority of the group that is currently communicating with the group, the mobile station Since the current group communication is continued as it is, the group communication in the high priority group currently being communicated is not interrupted by switching to the group communication in the later low priority group, Group communication with a high priority group can be continued, and highly practical group communication can be performed.

  In the above embodiment, when entering the newly set group communication on the ACCH (accompanying control channel) during group communication on the communication channel, if the communication method is TDMA, the frequency and slot, FDMA In the case of or SCPC, the frequency is switched.

  In addition, the present invention is not limited to the above-described embodiment. For example, in step S7 of the first embodiment, the identification information of the group that is to newly perform group communication and the storage unit 23 are stored. Although it has been explained that when the identification information of the group of the local station matches, it automatically switches to the new group communication, a new group communication setting request is displayed on the mobile station, and the user manually operates based on the display. It is also possible to arbitrarily select whether or not to perform new group communication.

It is a system configuration figure of one embodiment of a group communication system of the present invention. It is a block diagram of an example of the line control apparatus in FIG. FIG. 2 is a block diagram of an example of a radio base station in FIG. 1. It is a block diagram of one Embodiment of the mobile station of this invention. FIG. 5 is a sequence diagram for explaining an operation of the first exemplary embodiment of the present invention. It is a sequence diagram for operation | movement description of the 2nd Embodiment of this invention.

Explanation of symbols

1 Control station 2 ₁ to 2 _m mobile station 11 controls stage 12 line control unit 13 ₁ to 13 _n radio base station 21,125,134 controller 23 storage unit 24,133 radio unit 25,132 signal processing unit 122 channel switch 123 Voice processing unit 126 Control signal processing unit 131 Interface

Claims (14)

In a group communication method in which a control station having a plurality of radio base stations performs group communication using radio channels between two or more radio base stations of the plurality of radio base stations and a plurality of mobile stations,
During a group communication between the control station and the plurality of mobile stations, when there is a new group communication setting request for the control station, a signal generation step of generating a group communication call signal;
A group communication paging signal including the generated identification information of the group is transmitted from each of the plurality of radio base stations to the plurality of mobile stations through both the general paging channel of the control channel and the accompanying control channel of the communication channel. A group communication call signal transmission step;
Receiving whether or not new group communication based on the received group communication call signal is performed in place of the current group communication in each of the plurality of mobile stations that are currently receiving the group communication call signal and are currently in group communication. Selecting based on group identification information included in the group communication call signal,
When it is selected in the selection step that a new group communication based on the group communication call signal is performed instead of the current group communication, a new group is created by switching a call channel between the control station and the mobile station. A group communication method comprising: performing communication. In a group communication method in which a control station having a plurality of radio base stations performs group communication using radio channels between two or more radio base stations of the plurality of radio base stations and a plurality of mobile stations,
During group communication between the control station and the plurality of mobile stations, when there is a new group communication setting request to the control station, identification information of a group that performs new group communication with the group communication setting request A signal generating step for generating a group communication call signal including:
A group communication paging signal including the generated identification information of the group is transmitted from each of the plurality of radio base stations to the plurality of mobile stations through both the general paging channel of the control channel and the accompanying control channel of the communication channel. A group communication call signal transmission step;
Based on the group identification information included in the received group communication call signal, each of the plurality of mobile stations that are currently receiving group communication call signals and that are currently in group communication, sets the new group communication setting. A determination step of determining whether or not the request belongs to a group;
A step of performing a new group communication by switching a call channel between the mobile station and the control station when it is determined in the determining step that the terminal belongs to the group of the new group communication setting request. A group communication method. In a group communication method in which a control station having a plurality of radio base stations performs group communication using radio channels between two or more radio base stations of the plurality of radio base stations and a plurality of mobile stations,
During group communication between the control station and the plurality of mobile stations, when there is a new group communication setting request to the control station, identification information of a group that performs new group communication with the group communication setting request A signal generating step for generating a group communication call signal including:
A group communication paging signal including the generated identification information of the group is transmitted from each of the plurality of radio base stations to the plurality of mobile stations through both the general paging channel of the control channel and the accompanying control channel of the communication channel. A group communication call signal transmission step;
In each of the plurality of mobile stations that are currently receiving group communication call signals and performing group communication, a group that performs new group communication indicated by the identification information of the group included in the received group communication call signal, A determination step of determining whether the priority is higher than the group currently in group communication based on the priority of the group stored in advance in the own terminal;
A group performing a new group communication, switching a call channel between the mobile station determined in the determination step and the control station when the priority is higher than a group currently in the group communication and performing a new group communication; And the group communication method is characterized in that the current group communication is continued when it is determined that the group performing the new group communication in the determination step has the same or lower priority than the group currently in the group communication.   The control station is connected between a control table for man-machine interface, the plurality of radio base stations, the control table and the plurality of radio base stations, and transmits a plurality of audio signals and control signals to the plurality of radio base stations. The group communication method according to any one of claims 1 to 3, further comprising: a line control device including a transmission / reception unit that transmits and receives each of the radio base stations.   The radio base station wirelessly transmits a group communication call signal including identification information of the group input as a voice signal from the line control device through a general call channel of a control channel, and inputs the control signal from the line control device as a control signal. 5. The group communication method according to claim 1, further comprising: performing signal processing for wirelessly transmitting a group communication call signal including the identification information of the group transmitted through an associated control channel of a communication channel. . In a group communication system in which a control station having a plurality of radio base stations performs group communication using radio channels between two or more radio base stations of the plurality of radio base stations and a plurality of mobile stations,
The control station
During a group communication with the plurality of mobile stations, when there is a new group communication setting request to the control station, a signal generation means for generating a group communication call signal,
A group communication paging signal including the generated identification information of the group is transmitted from each of the plurality of radio base stations to the plurality of mobile stations through both the general paging channel of the control channel and the accompanying control channel of the communication channel. A group communication call signal transmission means;
Call path switching means for switching a call channel with the mobile station and performing a new group communication,
The mobile station currently in group communication is
Whether the group communication call signal transmitted from the control station is received and whether new group communication based on the received group communication call signal is performed instead of the current group communication is included in the received group communication call signal Receiving / selecting means for selecting based on group identification information;
When the reception / selection unit selects to perform a new group communication based on the group communication call signal instead of the current group communication, the communication channel is switched with the control station to perform a new group communication. A group communication system. In a group communication system in which a control station having a plurality of radio base stations performs group communication using radio channels between two or more radio base stations of the plurality of radio base stations and a plurality of mobile stations,
The control station
During group communication with the plurality of mobile stations, when there is a new group communication setting request to the control station, group communication including identification information of a group performing new group communication with the group communication setting request Signal generating means for generating a call signal;
A group communication paging signal including the generated identification information of the group is transmitted from each of the plurality of radio base stations to the plurality of mobile stations through both the general paging channel of the control channel and the accompanying control channel of the communication channel. A group communication call signal transmission means;
Call path switching means for switching a call channel with the mobile station and performing a new group communication,
The mobile station currently in group communication is
The group communication call signal transmitted from the control station is received, and based on the identification information of the group included in the group communication call signal, it is determined whether or not the own terminal belongs to the new group communication setting request group Determination means to perform,
Switching means for performing new group communication by switching a call channel with the control station when the determining means determines that the terminal belongs to the group of the new group communication setting request. A group communication system. In a group communication system in which a control station having a plurality of radio base stations performs group communication using radio channels between two or more radio base stations of the plurality of radio base stations and a plurality of mobile stations,
The control station
During group communication with the plurality of mobile stations, when there is a new group communication setting request to the control station, group communication including identification information of a group performing new group communication with the group communication setting request Signal generating means for generating a call signal;
A group communication paging signal including the generated identification information of the group is transmitted from each of the plurality of radio base stations to the plurality of mobile stations through both the general paging channel of the control channel and the accompanying control channel of the communication channel. A group communication call signal transmission means;
Call path switching means for switching a call channel with the mobile station and performing a new group communication,
The mobile station currently in group communication is
Whether the group that receives the group communication call signal and performs the new group communication indicated by the identification information of the group included in the group communication call signal has higher priority than the group that is currently communicating with the group. Determination means for determining based on the priority of the group stored in advance in the terminal;
Switching means for switching the call channel to the control station and performing new group communication only when the determination means determines that the group performing new group communication has a higher priority than the group currently in group communication And
When the mobile station in the current group communication determines that the group performing the new group communication by the determination unit has the same or lower priority than the group in the current group communication, the current group communication is continued. A group communication system.   The control station is connected between a control table for man-machine interface, the plurality of radio base stations, the control table and the plurality of radio base stations, and transmits a plurality of audio signals and control signals to the plurality of radio base stations. The group communication system according to any one of claims 6 to 8, further comprising: a line control device including a transmission / reception unit that transmits and receives each of the radio base stations.   The radio base station wirelessly transmits a group communication call signal including identification information of the group input as a voice signal from the line control device through a general call channel of a control channel, and inputs the control signal from the line control device as a control signal. The group communication system according to any one of claims 6 to 9, wherein a signal processing is performed to wirelessly transmit a group communication call signal including the identification information of the group that has been transmitted through an accompanying control channel of the communication channel. . In a mobile station that performs group communication with a control station having a plurality of radio base stations using a radio line,
A group communication call signal receiving means for receiving a group communication call signal transmitted from both the control channel and the associated control channel of the communication channel during the group communication;
Selection means for selecting whether to perform the new group communication in place of the current group communication based on the group identification information included in the received group communication call signal;
When the selection means selects that the new group communication based on the group communication call signal is performed instead of the current group communication, a new group communication is performed by switching the call channel with the control station. A mobile station characterized by In a mobile station that performs group communication with a control station having a plurality of radio base stations using a radio line,
A group communication call for receiving a group communication call signal including identification information of a group performing a new group communication, which is transmitted from both the control channel and the associated control channel of the communication channel during the group communication. A signal receiving means;
Determining means for determining whether the own terminal belongs to the group of the new group communication setting request based on the identification information of the group included in the received group communication call signal;
Switching means for performing new group communication by switching a call channel with the control station when the determining means determines that the terminal belongs to the group of the new group communication setting request. Mobile station. In a mobile station that performs group communication with a control station having a plurality of radio base stations using a radio line,
A group communication call for receiving a group communication call signal including identification information of a group performing a new group communication, which is transmitted from both the control channel and the associated control channel of the communication channel during the group communication. A signal receiving means;
A storage unit in which communication priorities of two or more groups to which the own terminal belongs are stored in advance;
Whether the group performing the new group communication indicated by the identification information of the group included in the received group communication call signal has higher priority than the group currently performing the group communication is stored in the storage unit in advance. Determination means for determining based on the priority of the group being
Switching means for switching the call channel to the control station and performing new group communication only when the determination means determines that the group performing new group communication has a higher priority than the group currently in group communication And the group that performs new group communication by the determination means determines that the priority is the same or lower than the group that is currently communicating with the group, and continues the current group communication. .   14. The display device according to claim 11, further comprising display means for receiving the group communication call signal on the associated control channel and displaying identification information of a group performing new group communication included in the group communication call signal. The mobile station as described in any one of them.

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