JP2008288774A - Wireless communication system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wireless communication system which constitutes the digital disaster prevention wireless communication systems of prefectures, cities, towns and villages conventionally constituted of two systems of a mobile system and a broadcasting system by one system. <P>SOLUTION: A mobile system digital communication system is provided with an operation console, an outdoor loudspeaker and a house receiver for broadcasting communication. When broadcasting system use is requested from the operation console, a line controller monitors the carrier of the communication channel of the mobile system for which four slots are allocated in one frame, and when performing the broadcasting communication, allocates all the four slots in one carrier to a broadcasting communication channel and uses them as a broadcasting channel. When all of the four slots are not free, communication is forcibly ended to perform the broadcasting communication in the case of a broadcasting communication request with a high degree of emergency, and standby is performed until the four slots become free to perform the broadcasting communication in the case of the broadcasting communication request with a low degree of emergency. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a wireless communication system, and more particularly, to a wireless communication system in which a mobile communication system and a broadcast communication system are configured as one system in a prefecture or municipal digital disaster prevention wireless communication system.

  Conventionally, prefectures and municipal digital disaster prevention radio communication systems (hereinafter referred to as digital communication systems) usually have two types, “mobile” and “broadcast”, and the contents are defined by different standards. Has been. For this reason, municipalities have introduced two types of digital communication systems, mobile and broadcast.

  For example, the following Patent Document 1 is known as a mobile communication system. Patent Document 1 proposes a digital radio system and a digital radio synchronization method that eliminate mutual interference in a digital radio system including a base station and a mobile station.

  As a broadcast radio system, for example, Patent Document 2 is known. In Patent Document 2, in the broadcast wireless system, even if only one line can be opened simultaneously for performing image transmission between the center station and the terminal station device, the center station does not respond to image information transmission from the terminal station. A digital broadcast radio system has been proposed in which an undefined slot different from a previously assigned uplink slot is assigned as an uplink slot so that images can be received simultaneously or almost simultaneously from a plurality of terminal station apparatuses.

JP 2006-222489 A JP 2006-157764 A

  As mentioned above, two types of digital communication systems, the “mobile system” and the “broadcast system”, had to be introduced in the past, and there was no need for double line control and radio base station equipment. The cost was high.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a wireless communication system in which a mobile system and a broadcast system are configured as one digital communication system, thereby enabling cost reduction.

In order to solve the above-described problems, a radio communication system according to the present invention includes a radio base station that performs radio transmission and reception, a terminal of a digital mobile communication system, an operation unit for performing broadcast communication, and data for voice enhancement. Controls radio terminals for loudspeaking data installed outdoors for transmission and reception, loudspeakers for loudening the loudspeaking data, individual receivers for reproducing the loudspeaking data, and lines for managing and managing the entire system And control means to
The control means monitors the carrier of the communication channel of 1 frame 4 slots of mobile communication, and if the broadcast request is urgent, the communication channel in use is forcibly set as an empty channel and broadcast communication is performed. When the broadcast request is low in urgency, the broadcast communication is performed after waiting for all four slots of the mobile communication to become free communication channels.

  The radio communication system according to the present invention includes a radio base station that performs radio transmission and reception, a radio terminal that performs radio communication via the radio base station, and a control unit that controls a line for managing and managing the entire system. The control means monitors a predetermined signal, and when a high priority signal is received, the communication channel in use is forcibly set to an empty communication channel to perform communication, and a low priority signal is received. Then, it may be configured as a wireless communication system that performs communication after waiting for a communication channel in use to become an empty channel.

  According to the present invention, when a mobile communication carrier to which 4 slots are allocated per frame is monitored and broadcast communication is performed, all the 4 slots are allocated to the broadcast channel and used as a broadcast channel. To build a prefectural / municipal digital disaster prevention radio communication system that can be used as a single mobile system and can be used as a single system for mobile communications. It is possible to reduce the cost.

  Hereinafter, embodiments of a wireless communication system according to the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a diagram showing a configuration of a wireless communication system of the present invention. In the wireless communication system, the mobile system 104 is mainly configured by an MPU (Microprocessor) or the like, and is connected to the line control device 101 that controls a line for managing and managing the entire digital communication system, and the line control device. A wireless base station 102 that performs wireless transmission and reception and a wireless terminal (vehicle-mounted wireless terminal, portable device, etc.) 103 are configured. Note that the line control apparatus 101, the wireless base station 102, and the console 111 may be installed in one building to serve as a management center or a control station. In the present invention, as shown in FIG. 1, a broadcasting system is constructed by adding a broadcasting function to a mobile system 104, and a console 111 for broadcasting communication is provided with a line control device 101. It is connected to the.

  The broadcast communication console 111 of this embodiment includes at least a broadcast system switching button A (broadcast button), a collective report operation button B (collective button), and a contact call operation button C (contact button). And an operation button D (emergency button) indicating that the degree of urgency is high. In addition, a plurality of wireless terminals 113 for outdoor loudspeakers are installed for broadcast communication. Although only one unit is shown in the figure because it is complicated, the wireless terminals 113 for outdoor loudspeakers are actually installed at a plurality of locations. Furthermore, a door-to-door receiver 114 capable of receiving broadcast communication may be installed in each house for areas where it is difficult to hear the sound of the outdoor loudspeaker speaker.

  Here, when considering data transmission in a wireless section of a mobile system, for example, the data transmission capacity of the standard ARIB STD-T79 has 6.4 kbps 4 slots, and a plurality of slots can be used simultaneously. It is.

  On the other hand, the broadcast transmission capacity of the digital communication system is 25.6 kbps in the case of “collective notification” and 6.4 kbps or less in the case of “contact communication”.

  First, consider 25.6 kbps in the case of the broadcast system “collective notification”. This transmission capacity corresponds to 4 slots in the mobile system, and when there are 2 carrier frequency allocations that can be used by the mobile radio base station, the control channel is 1 slot, and the communication channel is 7 slots. In the case of the configuration, since 4 slots can be secured by one carrier, collective reporting can be realized.

  As shown in FIG. 4, each radio carrier is divided into frames, and the frame is further divided into four slots, and then a control channel C and a communication channel S are allocated to the slots. Here, one frame is 40 ms, for example. The control channel C is a channel that performs connection control of a wireless line, and the communication channel S is a channel that performs telephone calls and data communication. A carrier including one or more control channels is referred to as a control carrier, and a carrier constituted only by communication channels is referred to as a communication carrier.

  FIG. 2 is a sequence diagram showing the “batch notification” operation of the outdoor loudspeaker 113 in the wireless communication system according to the present invention, which is mainly composed of a mobile communication system.

  First, a broadcast button is pressed from the broadcast communication console (hereinafter referred to as “operation console”) to the line control apparatus 101 to make a broadcast system use request (S1). At this time, if the content of the broadcast communication is highly urgent, the operator presses the emergency button on the console.

  The line control apparatus 101 checks whether all the carriers (4 slots) of the radio base station 102 are free from the connection information of the control channel C, and when the emergency button is pressed, the degree of urgency is high. If all one carrier is available, a call channel (hereinafter referred to as TCH) is activated by simultaneous communication. If all one carrier is not available, forced termination (forced cutoff) is performed (S2).

  On the other hand, when the emergency button is not pressed, the degree of urgency is low, and it waits for all one carrier to become an empty communication channel. After a predetermined time set in the timer has elapsed after the start of the start for simultaneous communication (S3), the broadcast use permission is notified to the console 111 (S4).

  Upon receiving the broadcast use permission notification, the console 111 issues a speaker ON request to output sound (S5).

  The line control apparatus 101 controls the speaker by TCH. After that, the console 111 confirms the operation of each outdoor loudspeaker 113 by polling (S6), and then starts sending audio. After making the polling response, the outdoor loudspeaker 113 regards the entire Tch as audio data and performs audio output (S7).

  At the end, the console 111 informs the line control apparatus 101 that the voice output has ended (S8), and the line control apparatus 101 performs a call termination process (TCH release request) (S9).

  Receiving the TCH opening request, the outdoor loudspeaker 113 turns off the speaker to stop the sound output (S10) and opens the TCH (S11). The line control device (S12) that has received the release completion from the radio base station device 102 sends a completion response to the console 111 (S13), and ends a series of operations.

  In the case of the door-to-door receiver 114, since a response cannot be returned, it is possible to realize “batch notification” by performing an operation in which all the data in the TCH is regarded as voice in response to the TCH speaker ON request. is there. That is, in the case of a door-to-door receiver, the operation sequence is the same except that the operation confirmation response in S7 from the outdoor loudspeaker 113 to the radio base station, the line control device, and the broadcast console 111 in FIG. It is.

  Next, consider the case of “contact call”. FIG. 3 is an operation sequence diagram of the communication call of the outdoor loudspeaker in the wireless communication system of the present invention. In the case of a communication call, since it is 6.4 kbps or less, it is possible to transmit voice in one slot of the mobile system. Therefore, a speaker is used in a radio base station in the case of one carrier and one control channel. A communication call can be realized with two slots to which control is added.

  First, a broadcast button is pressed from the broadcast communication console (hereinafter referred to as “operation console”) to the line control device 101 to make a broadcast system use request (SS1). At this time, if the content of the broadcast communication is highly urgent, the operator presses the emergency button on the console.

  The line control apparatus 101 confirms from the connection information of the control channel C whether or not two slots in one carrier of the radio base station 102 are free. If the emergency button is pressed, the degree of urgency is high. If two slots in the carrier are vacant, two-slot TCH activation is performed by simultaneous communication. If two slots are not vacant, forced termination (forced cutoff) is performed (SS2).

  In the two slots, TCH activation is performed in a voice slot and a non-voice slot, respectively. When the degree of urgency is low, that is, when the urgent button is not pressed, the process waits until two slots in one carrier become empty.

  After starting the start for simultaneous communication, after a certain time set in the timer (the time when all responses are expected to return) elapses, the line control device 101 permits the operation console 111 to be used. Notify (SS4). In order to output sound, the console 111 transmits a request for turning on the speaker and the sound (SS5).

  The line control apparatus 101 performs speaker control in the TCH non-voice slot (SS6), and outputs voice using the data in the TCH voice slot (SS7). Then, the console 111 confirms the operation of each outdoor loudspeaker 113 by polling (SS8). The line control device 101 performs polling confirmation of the console in the TCH non-voice slot (SS9).

  At the end, the console 111 informs the line control device 101 that the voice output has ended, that is, the completion of the broadcast system use (SS10). The line control apparatus 101 performs speaker OFF control in a non-voice slot as a call termination process, and sends a TCH release request to the outdoor loudspeaker 113 (SS11). The outdoor loudspeaker that has received the TCH opening request performs TCH opening (SS12). The line control device that has received the release completion from the radio base station device 102 sends a broadcast completion response to the console 111 (SS13), and ends a series of operations.

  In the case of the door-to-door receiver 114 as well, only a response cannot be returned, and a communication call can be realized by performing speaker control in the TCH non-voice slot and outputting sound in the data of the TCH voice slot. In the first and second embodiments, the line control apparatus 101, the radio base station 102, and the console 111 may be installed in one building to serve as a management center or a control station.

  As described above, according to the present invention, the mobile communication system can be provided with a broadcast function, and the prefectural and municipal digital communication systems can be constructed with a single system. It is no longer necessary to have the cost and the cost can be reduced.

The block diagram of the radio | wireless communications system of this invention. FIG. 5 is a sequence diagram of “collective notification” operation of the outdoor loudspeaker in the wireless communication system of the present invention. The operation | movement sequence diagram of the "contact communication" of the outdoor loudspeaker in the radio | wireless communications system of this invention. The figure which shows the flame | frame structure of a wireless carrier.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 101 ... Line control apparatus, 102 ... Wireless base station, 103 ... Wireless terminal, 104 ... Mobile system, 111 ... Broadcasting console, 112 ... Wireless terminal (for outdoor loudspeaker), 113 ... Outdoor loudspeaker.

Claims (1)

A wireless base station that performs wireless transmission and reception;
A wireless terminal that performs wireless communication via the wireless base station;
And at least a control means for controlling a line for managing and managing the entire system,
The control means monitors a predetermined signal;
When a high-priority signal is received, the communication channel in use is forcibly set to an empty communication channel for communication.
When a low-priority signal is received, the communication channel in use waits for an empty channel to communicate.
A wireless communication system.

Images