JP2005151239A - Digital mobile radio system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a digital mobile radio system which eliminates a short break of a communication path accompanying with the transfer of the right of transmission of a terminal after establishing a group communication link, and uses a group communication line connection dealing with a command station not using a press-to-talk signal. <P>SOLUTION: In the digital mobile radio system for making a communication link with a plurality of command stations and a plurality of mobile stations via a plurality of base stations, a line controller for executing exchange controls is connected to the plurality of command stations and the plurality of mobile stations, and has a conference trunk which relays sound signals of added sound inputs from those stations constituting the group communication to a down-link talking path at the time of the communication link connection and sound signals of subtracted sound input signals of the command stations from the all added sound inputs from a down-link talking path, when any command station and the plurality of mobile stations or the plurality of mobile stations execute the group communication. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

The present invention relates to line connection for group communication in a digital mobile radio system, and more particularly to control of line connection when group communication is performed between a plurality of mobile stations and a command station.

FIG. 4 shows an example of a conventional digital mobile radio system.
4 includes a plurality of command stations 401 and 402, a plurality of base stations 201 to 203, a plurality of mobile stations 101 to 105, and a line control device 300. In the line control device 300, a base station Station interfaces 311 to 313, time division switch 320 for a speech path, voice code conversion units 331 and 332 for performing a loopback function and voice code conversion, a voice mixing unit 341, command station interfaces 351 and 352, and a voice output interface 361 and a mix monitor speaker 411.
The audio code conversion units 331 and 332 convert the ELCELP audio signal sent from each base station to the base station in the SEL unit and convert the ELCELP audio signal into a PCM audio signal, or It has a conversion function from the opposite PCM system to the ELCELP system.

For example, the audio signal of the mobile station 101 having the transmission right is input to the audio code conversion unit 331 via the base station 201, the base station interface 311, and the time division switch 320.
Then, the audio signal is turned back at the SEL unit and relayed to the mobile stations 102 and 103 via the base station interface 311, the base station 201, the base station interface 312, and the base station 202.
In addition, the voice code conversion unit 331 converts the voice signal into a PCM voice signal, and transmits the voice signal to the command station 401 via the command station interface 351.
Here, when the transmission right moves from the mobile station 101 to the mobile station 103, the call path between the base station interface 311 and the voice code converter 331 is released, and the call path between the base station interface 312 and the voice code converter 331. Is connected.
The transmission right is moved in accordance with a press talk signal issued by the mobile station using a control channel (control CH) (not shown).

On the other hand, when the command station 401 transmits, the line control device 300 detects a press talk signal emitted from the command station 401 and connects the SEL unit of the voice code conversion unit 331 from the solid line to the dotted line side in the figure. By switching, the relay of the voice signal of the mobile station 101 to the base station 201 is stopped, the voice signal of the command station 401 is converted into an ELCELP voice signal, and the voice signal is relayed to the base stations 201 and 202. Established.

As described above, in the conventional system, every time the base station where the transmission from the mobile station is located changes, or whenever the transmission right changes from the mobile station to the command station or from the command station to the mobile station Therefore, when the transmission right moves, the connection of the time division switch 320 or the switching of the SEL unit of the voice code conversion unit 331 occurs, and the call path is interrupted.
In addition, it is an indispensable operation to transmit a press talk signal from the command station for the call path connection.

Further, for example, there is Patent Literature 1 as a technology related to a conventional digital mobile radio system.

JP 2002-2108068 A

The conventional digital mobile radio system described above has a problem in that the call path is interrupted when the transmission terminal changes, and thus it may not be possible to respond to a quick call response.
Further, since the call path is switched by a press talk signal sent from the terminal, there is a problem that it is not possible to deal with a command station that does not use the press talk signal.

The present invention has been made in view of the above-described prior art, and after establishing a group communication link, eliminates a momentary disconnection of a communication path due to movement of a transmission right of a terminal, and also supports a command station that does not use a press talk signal. It is an object of the present invention to provide a digital mobile radio system with possible group communication line connection.

In order to solve the above-described conventional problems, the present invention provides a digital mobile radio system in which a plurality of command stations and a plurality of mobile stations form communication links via a plurality of base stations. When a station is connected to a line control device that performs switching control, the line control device communicates with any command station and a plurality of mobile stations, or when a plurality of mobile stations perform group communication by voice communication. The voice signal obtained by adding the voice input from each station constituting the group communication is relayed to the path, the downlink call path, and the voice input signal of the command station is subtracted from the total added voice input to the uplink call path. A conference trunk for relaying voice signals is provided.

Further, in order to solve the above-described conventional problems, the present invention is a digital mobile radio comprising a plurality of mobile stations, a plurality of command stations, a plurality of base stations, and a line control device for controlling switching of communication links. In the system, the line control device is configured to use voice signals for all communication paths when a group communication link is connected between a command station and a plurality of mobile stations, or between a plurality of mobile stations communicating one-to-n. In the downlink call path to the base station, the voice signal obtained by adding all the voice inputs from the devices constituting the group communication is relayed, and in the call path to the command station, the voice input of the own command station is input from the total added voice input. By relaying the voice signal with the signal reduced, after establishing the communication link for group communication, the voice signal is relayed without switching the call path when the transmission right of the mobile station or command station moves. The group communication line connection is maintained.

According to the present invention, it is possible to provide a digital mobile radio system capable of dealing with quick transmission right transfer and quick call response by eliminating a call path interruption due to transmission right movement of a mobile station after establishing a group communication link. .
Further, according to the present invention, it is possible to provide a digital mobile radio system that can perform a group communication function even for a command station that does not have a press talk signal.

Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a digital mobile radio system according to an embodiment of the present invention.
FIG. 1 shows an embodiment of a group communication line connection system in a mobile radio system according to the present invention. A plurality of command stations 401 and 402, a plurality of base stations 201 to 203, and a plurality of mobile stations 101 are shown. ˜105 and a line control device 310, and in the line control device 310, base station interfaces 371 to 373, a time-division switch 320 for a speech path, conference trunks 381 and 382, and a voice mixing unit 341 , Command station interfaces 351 and 352, an audio output interface 361, and a mix monitor speaker 411.
Here, the base station interfaces 371 to 373 have a voice code conversion function added to the functions of the conventional base station interfaces 311 to 313, and convert the ELCELP system into a PCM system voice signal or vice versa. It has a conversion function from the PCM system to the ELCELP system.

FIG. 5 shows a conference trunk used in the digital mobile radio system according to the embodiment of the present invention. FIG. 5A is an image diagram of an input / output port, and FIG. 5B is an input / output signal terminal and its input. The table of an output destination is shown.
For example, a signal obtained by adding the input signals of the input terminals I2, I3,..., In by connecting the output terminal O1 as a downstream signal and connecting the upstream signal to the input terminals I3, I4,. That is, a signal obtained by fully adding is output from the output terminal O1.

In the embodiment of the present invention according to FIG. 1, for example, the first output of the conference trunk 381 is connected to the downlink call path of the base station constituting the group communication, and the uplink call path from each base station is connected to the conference trunk 381. Are connected to the inputs of No. 3, No. 4,... No. n, by adding the voice input signals from all base stations and command stations constituting the group communication, that is, No. 2 of the conference trunk 381, The first output signal obtained by fully adding the third and fourth inputs is relayed to each base station.
Then, the mobile station 102 receives the audio signal of the mobile station 101 included in the downlink signal of the base station 201.
On the other hand, the audio signal transmitted by the command station 401 is not returned to the command station 401.
According to the embodiment of the present invention, even when the transmission right from the mobile station or the command station moves, there is no need to change the connection of the call path, so the call path is interrupted after the group communication link is established. do not do.
In addition, since the call path is not switched, the line control apparatus does not need to receive a press talk signal from the command station.

Next, the operation of the digital wireless system according to the embodiment of the present invention will be described with reference to FIGS.
FIG. 2 shows a first example for explaining the operation of the digital radio system according to the embodiment of the present invention.
FIG. 2 shows a communication link connection operation during group communication of the digital mobile radio system. The mobile stations 101 to 105, the base stations 201 to 203, the line control device 310, and the command stations 401 and 402 are the same as those shown in FIG. It is the same.
In the first embodiment, the mobile stations 101 and 102 are registered in the base station 201 as indicated by dotted lines, and are located in the base station zone of the base station 201.
Similarly, the mobile station 103 is in the base station zone of the base station 202, and the mobile stations 104 and 105 are in the base station zone of the base station 203.

FIG. 3 shows a second example for explaining the operation of the digital radio system according to the embodiment of the present invention.
FIG. 3 is a diagram for simply explaining a communication link when a mobile station and a command station are called from a mobile station by group communication.
In the second embodiment, the mobile stations 101 to 103 and the command station 401 belong to the same group.
The mobile stations 104 and 105 and the command station 402 belong to the same group.
Here, when the mobile station 101 is a caller and the mobile station 101 initiates group communication, a call connection request is made from the base station 202 to the line controller 310, and the line controller 310 to the base station 201, A group communication call setting request is issued to 202.
A group communication incoming connection is also made to the command station.
As a result, the mobile stations 102 and 103 are drawn into the group communication as indicated by a one-dot chain line.
Similarly, the group communication links of the mobile stations 104 and 105, the base station 203, the line control device 310, and the command station 402, which are other groups, are connected as indicated by a one-dot chain line.
With such an operation, even when the group communication according to FIG. 1 described above is established and the transmission right from the mobile station or the command station moves, it is not necessary to change the connection of the call path, and the call after the group communication link is established There will be no instantaneous interruption of the path.

According to the first embodiment of FIG. 2 and the second embodiment of FIG. 3 described above, a conference trunk is provided in the line control device, and a time division speech path switch is provided between the input / output terminal of the conference trunk and a plurality of base stations and command stations. By connecting with, the voice signal from the terminal having the transmission right can be relayed to other receiving terminals (mobile station and command station) without being influenced by the movement of the transmission right of the mobile station or the command station. .

As described above in detail, according to the embodiment of the present invention, the conference trunk that adds and outputs the voice signals from the base station and the command station is used, and the downlink communication paths for all the base stations are all input. After the establishment of the communication link for group communication, the presence of the transmitting terminal is relayed by relaying the voice signal obtained by subtracting only the voice input of the command station from all the inputs to the call path to the command station. A digital mobile radio system that eliminates the need for switching the call path of the time-division switch of the line control device even if the base station in service area changes or the transmitting terminal changes to the command station, and does not cause instantaneous interruption of the call path Is.
Further, since there is no switching of the call path, a press talk signal from the command station is unnecessary, and the system can be applied to a command station not provided with a press talk switch.

Therefore, when a group communication function (single communication 1: n communication) for sharing communication information is required, the conventional 1: n communication line control method has one simultaneous transmission-permitted terminal. Since all others are in the receiving state, and the line control device manages the transmission allowable terminals by the press talk signal issued from the mobile station or the command station, in the time division switch of the line control device, Since the uplink call path from the transmission terminal is relayed to the downlink call path corresponding to all the reception terminals, the line control device every time the base station where the transmission terminal is located changes or every time the transmission command station changes Because the call path of the time-division switch is switched, an instantaneous interruption of the call path occurs. Depending on the usability of the command station, a press talk switch that generates a press talk signal is used. The may not provided, in this case it is possible to provide a digital mobile radio system to solve the inability corresponding.

That is, according to the present invention, in a digital mobile radio system composed of a plurality of mobile stations, a plurality of command stations, a plurality of base stations, and a line control device that controls switching of communication links, the command station and a plurality of Using a conference trunk in which a plurality of base stations and command stations are provided in a line controller for a communication path when a group communication link is connected between stations or a plurality of mobile stations communicate one-to-n. In the downlink call path to the base station, a voice signal obtained by adding all voice inputs from the devices constituting the group communication is relayed, and in the call path to the command station, the voice input signal from the command station to the command station. By relaying a voice signal with a reduced number of groups, after establishing a communication link for group communication, even if the transmission terminal changes due to transfer of transmission rights, the group communication circuit does not need to switch the call path. A digital mobile radio system that provides line connection is provided.

1 shows a digital mobile radio system according to an embodiment of the present invention. The 1st Example explaining operation | movement of the digital radio | wireless system which is embodiment of this invention is shown. The 2nd Example explaining operation | movement of the digital radio | wireless system which is embodiment of this invention is shown. 1 shows an example of a conventional digital mobile radio system. The conference trunk used for the digital mobile radio | wireless system which is embodiment of this invention is shown, (a) is an image figure of an input-output port, (b) shows the table of the input-output signal terminal and its input-output destination.

Explanation of symbols

101, 102, 103, 104, 105: mobile station,
201, 202, 203: base station,
300, 310: line control device,
311, 312, 313: base station interface,
320: Time division switch,
331, 332: voice code conversion unit,
341: Audio mixing device,
351, 352: Command station interface,
361: audio output interface;
371, 372, 373: Base station interface (including voice code conversion function),
381, 382: Conference trunk,
401, 402: Command stations.

Claims (2)

In a digital mobile radio system in which a plurality of command stations and a plurality of mobile stations establish communication links via a plurality of base stations,
The plurality of command stations and the plurality of base stations are connected to a line control device for performing switching control,
The line control device configures a communication path when a communication link is connected and a group communication for a downlink communication path when an arbitrary command station and a plurality of mobile stations or a plurality of mobile stations perform group communication by voice communication. And a conference trunk that relays the voice signal obtained by adding the voice input from each station and relaying the voice signal obtained by subtracting the voice input signal of the command station from the total added voice input. A featured digital mobile radio system. In a digital mobile radio system composed of a plurality of mobile stations, a plurality of command stations, a plurality of base stations, and a line control device that performs communication link exchange control,
The line control device uses a voice signal to connect a communication path between a command station and a plurality of mobile stations or a group communication link in which a plurality of mobile stations communicate with each other in a 1: n manner to all base stations. In the downlink call path for the relay, a voice signal obtained by adding all voice inputs from the devices constituting the group communication is relayed,
By relaying a voice signal obtained by subtracting the voice input signal of the own command station from the full addition voice input to the call path to the command station,
After establishing a communication link for group communication, digital communication is characterized by group communication line connection that maintains voice signal relay without switching the call path when the transmission right of the mobile station or command station moves Wireless system.

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