JP2006033430A - Digital mobile wireless system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a digital mobile wireless system, by which a voice mixer other than a conference trunk is not required for a line controller, when a group communication link between an arbitrary command station and a plurality of mobile stations is established. <P>SOLUTION: At least one command station and a plurality of mobile stations form a communication link via at least one base station in the digital mobile wireless system. The line controller for executing exchange control is connected to at least one command station and at least one base station. The line controller is provided with a transmission request allowing means, with which the number of stations making transmission requests of below the allowable number to the arbitrary preset transmission requests is set to (m), and the conference trunk for outputting voice input by speech paths within the number of the (m) stations making the transmission requests, after adding all the voice inputs. When group communication by voice communication is executed by the arbitrary command station and a plurality of the mobile stations or by a plurality of the mobile stations with (n) stations, group communication is established, by the reception of the added voice which is generated by adding voice of the transmission-side (m) stations, with the reception-side (n) stations. <P>COPYRIGHT: (C)2006,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 performing group communication between an arbitrary command station and a plurality of mobile stations or between mobile stations.

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.

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

JP 2002-2108068 A

The above-described conventional digital mobile radio system does not use a press talk signal when performing a group communication between an arbitrary command station and a mobile station because a call path is switched by a press talk signal sent from the mobile station. There was a problem that it could not cope with the command station.
In addition, the line control device has a voice mixing unit separately from the conference trunk, which causes a problem that the line control device becomes expensive.

The present invention has been made in view of the above prior art, and when establishing a group communication link between an arbitrary command station and a plurality of mobile stations, the line control device needs a voice mixing unit different from the conference trunk. An object is to provide a digital mobile radio system that does not.
It is another object of the present invention to provide a digital mobile radio system that establishes a group communication link by connecting to a group communication line that is compatible with a command station that does not use a press talk signal.

In order to solve the above-mentioned conventional problems, the invention described in claim 1 is characterized in that in the digital mobile radio system in which at least one command station and a plurality of mobile stations form a communication link via at least one base station, the at least A line control device that performs switching control is connected to one command station and at least one base station, and the line control device transmits m transmission requests equal to or less than the allowable number for a transmission request that is arbitrarily set in advance. It is equipped with request permission means and a conference trunk that outputs the sum of the voice input from the call paths within the m number of transmission requests, and any command station and a plurality of mobile stations or a plurality of mobile stations perform voice communication. When the group communication is performed by n units, group communication is established when the receiving side n units receive the added voice obtained by adding the audios of the transmission side m units.

In order to solve the above conventional problems, the invention according to claim 2 is a digital mobile radio system in which at least one command station and a plurality of mobile stations form a communication link through at least one base station. The at least one command station and the at least one base station are connected to a line control device that performs switching control, and the line control device has m transmission requests equal to or less than an allowable number for a transmission request that is arbitrarily set in advance. A transmission request permitting means, a voice adding means for fully adding the voice input by the m or less call paths for which a transmission request has been made, and a voice of the command station when there is a transmission request from the at least one command station A conference trunk for subtracting the input from the fully-added voice input and outputting it to the command station, and outputting the full-added voice input to the other stations, and having at least one command When any mobile station performs group communication by voice communication with n units, group communication is established when the receiving side n units receive the added voice obtained by adding the voices of m units on the transmission side. .

According to the present invention, it is possible to provide a digital mobile radio system that does not require a voice mixing unit different from a conference trunk in a line controller when establishing a group communication link between an arbitrary command station and a plurality of mobile stations. it can.
In addition, according to the present invention, it is possible to provide a digital mobile radio system that establishes a group communication link by a group communication line connection that is compatible with a command station that does not use 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. When an arbitrary command station and a plurality of mobile stations perform group communication, a station on the transmitting side is shown. In this example, m-to-n group communication is performed where m is the number of stations and n is the receiving station.
In FIG. 1, a plurality of command stations 401 and 402, a plurality of base stations 201 to 202, 20m ′ and 20n ′, a plurality of mobile stations 101 to 103, 10m ′ and 10L, and a line control device 310 are configured. The line control device 310 includes base station interfaces 371 to 372, 37m ′, and 37n ′, a time-division switch 320 for a communication path, a conference trunk 381, and command station interfaces 351 and 352.

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 mobile station 101 presses the press talk switch, etc. Group communication is performed by raising the transmission right request signal and connecting the uplink communication path from each base station that the line control device 310 has allowed voice transmission by preemptive priority control to the 4th to mth inputs of the conference trunk 381. Of all the base stations that make up the voice signal, the sum of the voice input signals from the base station that allowed the voice signal and the command station, ie, the second, third, fourth to mth inputs of the conference trunk 381 The first output signal is relayed to each base station.
Each mobile station receives the audio signal of the mobile station 101 included in the downlink signal of the base station 201.

On the other hand, for example, when the command station 401 transmits (transmits), the transmitted voice signal is not returned to the command station 401.
This is a voice signal obtained by adding the voice input from each station constituting the group communication to the call path when the communication link is connected, and the call path from the command station to another station via the conference trunk (downlink call path). And a voice signal obtained by subtracting a voice input signal transmitted by the command station from the full addition voice input in a call path (uplink call path) from each station to the command station. Thus, even a command station that does not require a press talk switch or the like does not output its own voice from its own speaker (not shown), and the voice is easy to hear.
Note that voice transmission from the mobile station requires that the press talk switch be pressed, so that it is not originally received during transmission.

Here, in the above-mentioned preemptive priority control, when there is a transmission right request signal from a plurality of mobile stations due to pressing of a press talk switch, the signal input earlier is processed with priority. By sequentially processing in the conference trunk, a plurality of inputs are added, and the transmission is transmitted to all the mobile stations and the command station.

As described above, the transmission right request signal from each base station is received by the line control device 310 via a control channel (not shown) between each base station and the line control device, and transmitted by preemptive priority control. The exchange connection control for selectively connecting the mobile station and the command station at the total of m on the side and n on the receiving side is performed.

Even if the total number n of mobile stations and command stations participating in group communication is large, usually when the other station is transmitting, the own station may move to the listening side. For this reason, group communication line connection for performing m-to-n communication can be performed more economically by setting the allowable number of simultaneous voice transmissions with the allowable number being about 2 to 5 units. .
For example, when the total number of stations (mobile station and command station) performing group communication is n and the number of stations transmitting (transmitting) is m, generally the number of speakers is 1 or 2. (M = 1 or 2), but there are cases where there are multiple speakers at the start of transmission or once the transmission is interrupted. Therefore, it is not necessary to set the permissible number of m units so large, and about 2 to 5 is an appropriate permissible number.
In addition, according to the transmission right request signal from the command station, the output voice path from the command station can be connected or released with a time division switch. During the group communication, the presence or absence of a transmission right request signal from another command station It is also possible to leave the output audio path connected from the command station regardless of the above.
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.

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.

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. Mobile stations 101 to 103, 10m ′, 10L, base stations 201 to 202, 20m ′, 20n ′, line control device 310, command The stations 401 and 402 are the same as those in FIG.
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 10m ′ and 10L are in the base station zone of the base station 20m ′.

For example, when all the mobile stations and the command station shown in FIG. 2 perform group communication, for example, when the command station acquires a transmission right, a voice signal can be transmitted (ie, transmitted) to the conference trunk 310.
In the conference trunk 310, the voice signals from all the stations that have acquired the transmission right by each station including the command station are fully added, and the voice signal from the command station is sent to the command station that has acquired the transmission right. The audio signal removed from the fully added audio signal is transmitted, and the fully added audio signal is transmitted to the other stations.
As a result, out of all stations in group communication, a voice signal in which all voices other than the voice signal from the command station are added is transmitted to the command station, and a voice in which all voice signals are added to the other stations. A signal is transmitted.
Note that acquisition of the transmission right of the command station can be made a state in which transmission is possible with priority over other mobile stations (interrupt control, etc.) by operating the transmission key of the command station.

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 10m ′ and 10L 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 201 to the line controller 310, and from the line controller 310 to the base station 202, A group communication call setting request is issued at 20 m ′.
The group communication incoming connection is also made to the command station 402.
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 10m ′ and 10L, the base station 20m ′, the line control device 310, and the command station 402, which are other groups, are connected as indicated by a one-dot chain line.

In this way, when performing group communication, for example, when several mobile stations transmit a transmission right request signal by a press talk switch, each conference station 310 performs preemptive priority control via a base station that is a higher rank. The mobile station can acquire a transmission right and transmit (that is, transmit) a voice signal.
The conference trunk 310 performs all voice input addition, and transmits the voice signal obtained by adding all voices to all base stations and command stations.
At that time, the mobile station itself that is transmitting the voice has pressed the press talk switch, and is not received because of the transmission state (that is, because the reception is impossible).
By such an operation, the group communication according to FIG. 1 described above is established.

In 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 without the need for a voice mix unit, an input / output terminal of the conference trunk and a plurality of base stations, By connecting the command stations with a time-division communication path switch, the voice signal from the terminal having the transmission right is transferred to another receiving terminal (mobile station or To the command station).

As described above in detail, according to the embodiment of the present invention, it is composed of a plurality of mobile station radio apparatuses, a plurality of communication command bases, a plurality of base station radio apparatuses, and a line control apparatus for performing exchange control of communication links. In a digital mobile radio system, a speech communication path between a communication command base and a plurality of mobile station radio devices or a plurality of mobile station radio devices communicating with each other in an m-to-n communication path is connected to a plurality of base stations. A conference trunk in which a wireless device and a communication command board are provided in the line control device is used, and a voice communication is transmitted among all the devices constituting the group communication in the downlink call path for all base station wireless devices. Relaying the audio signal obtained by subtracting the audio signal of the own communication command base from the m additional voices that allow the transmission, and the selection of the m devices that allow the voice transmission include the base station radio device and A method for providing group communication line connection m to n by performing the selection control by the prefetch priority control voice transmission right request signal from the signal command system.
Further, regarding the selection of m devices that allow voice transmission, when some communication command boards are used as the group communication, m: n is allowed by allowing voice transmission regardless of the presence or absence of a voice transmission right request signal. This is a method for providing a group communication line connection.

According to the present invention, the base station radio apparatus constituting the group communication, the total of the base station radio apparatus and the communication command base on the side that actually performs voice transmission at the same time even when the total number of communication command groups participating in the group communication is large Focusing on the fact that the number does not become a large number, a conference trunk is provided in the line control device, and a base selected by preemptive priority selection control of the transmission right request signal from the conference trunk input terminal, the base station radio device and the communication command board A digital mobile radio system that allows voice transmission to the base station radio equipment and communication command base corresponding to the number of input terminals of the conference trunk by connecting the station radio equipment and the communication command base with a time-division communication path switch It is to provide.

That is, in the digital mobile radio system, when establishing group communication for sharing communication information, if simultaneous transmission of all base stations and command stations constituting the group communication is allowed, the voice adder becomes large-scale, In order to solve the problem that the system becomes complicated and expensive, the number of devices capable of simultaneous transmission is set to m, and m of the devices are selected with priority given to the preemption of the transmission right request signal. By connecting to a conference trunk including a voice adder via a switch, a group communication line connection for performing m-to-n communication is enabled.

1 shows a digital mobile radio system according to an embodiment of the present invention. The 1st Example explaining operation | movement of the digital 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, 10m ′, 10L: mobile station,
201, 202, 203, 20m ′, 20n ′: 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,
381, 382: Conference trunk,
401, 402: Command stations.

Claims (2)

In a digital mobile radio system in which at least one command station and a plurality of mobile stations form a communication link via at least one base station,
The at least one command station and at least one base station are connected to a line control device for performing switching control,
The line control device includes transmission request permission means for setting m transmission requests equal to or less than an allowable number for a transmission request arbitrarily set in advance;
With a conference trunk that fully adds and outputs the voice input from the m call paths requested to send,
When an arbitrary command station and a plurality of mobile stations or a plurality of mobile stations perform group communication by voice communication with n units, the receiving side n units receive the added voice obtained by adding the m units of the transmission side. A digital mobile radio system characterized by establishing group communication. In a digital mobile radio system in which at least one command station and a plurality of mobile stations form a communication link via at least one base station,
The at least one command station and at least one base station are connected to a line control device for performing switching control,
The line control device includes transmission request permission means for setting m transmission requests equal to or less than an allowable number for a transmission request arbitrarily set in advance;
Voice adding means for fully adding voice input through m call paths requested to be transmitted;
When there is a transmission request from the at least one command station, the voice input of the command station is subtracted from the summed voice input and output to the command station. A conference trunk to output,
When at least one command station and an arbitrary mobile station perform group communication by voice communication in n units, group communication is established by receiving n units of added voices obtained by adding m units of transmission side audio. A digital mobile radio system.