JP2012151564A - Radio communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radio communication system which, for a forcible disconnection by controlled communication, enables a terminal station not subject to controlled communication to know that the disconnection made was a forcible disconnection by controlled communication.SOLUTION: A radio communication system equipped with plural terminal stations, a base station for communicating with the plural terminal stations by radio and a control station connected with the base station is organized in such a way that, while plural terminal stations are communicating with each other, the control station sends a disconnection notification that the communication will be forcibly disconnected to those communicating terminal stations via the base station and, after disconnecting the communication of the communicating terminal stations, establishes a controlled communication between itself and one of the terminal stations which have been communicating with each other, and that, out of the terminal stations which have received the disconnection notification, one other than the terminal stations with which the controlled communication with the control station is established will have a message shown on a display unit thereof to the effect that the disconnection made was a forcible disconnection by the control station.

Description

  The present invention relates to a radio communication system, and in particular, a plurality of base stations under the control of a control station, a plurality of terminal stations in each of these base stations, and digital radio for transmission between the base station and the terminal station The present invention relates to a regional disaster prevention radio system to which transmission is applied.

  In recent years, interest in regional disaster prevention has increased, and the importance of disaster prevention information transmission on a regional basis has been strongly screamed. A standard titled Digital Mobile Communication System is being developed. The system according to this standard includes a control station, a plurality of base stations, and a plurality of terminal stations. Patent Document 1 below includes a control station that controls the system and controls circuit-switched connections, a plurality of base stations, and a plurality of terminal stations, and these terminal stations pass through any of the base stations. Describes a digital wireless system that performs digital wireless communication with each other.

  FIG. 4 is a diagram showing a schematic configuration of a municipal digital mobile communication system. In FIG. 4, reference numeral 601 denotes a line control device (may be installed in the control station), 602 denotes a control table, and 603-1 to 603-M denote base stations. In addition, when representing a base station, it is referred to as a base station 603. Reference numerals 604-1, 604-2,... 604 -N denote terminal stations such as portable terminal radios and in-vehicle radios. In addition, when representing a terminal station, it is called a terminal station 604. Reference numeral 605 denotes a transmission line that connects the line control apparatus 601 and the base station 603, and a wired or micro line can be used. Reference numeral 608 denotes a communication area (also referred to as a communication zone).

The communication system shown in FIG. 4 includes a plurality of terminal stations 604-1, 604-2, 604-3,... 604-N and a control board 602 in the communication area 608 or via a base station 603-1. Or a communication connection service between the terminal station in the base station 603-1 and another base station, for example, a terminal station (not shown) in the communication area of the base station 603-M. Is a system configured to be performed. Note that the line control device 601 may be installed in the vicinity of the base station 603, or may be installed in a place distant from the place.
The line control apparatus 601 maintains and manages the communication connection and service area between the base station 603 and the plurality of terminal stations 604 in the digital communication system, and controls call from the terminal station 604 or communication route. Performs control for setting.

  FIG. 5 shows radio carrier frequency allocation permitted for use in a municipal digital mobile communication system using the digital radio technology defined in the standard ARIB STD-T79. In FIG. 5, 112 waves (f1, f2,...) Having a width of 25 KHz and a frequency of about 262 MHz to 265 MHz are recognized in the uplink direction, that is, the direction from the terminal station to the base station. Further, in the downlink direction, that is, in the direction from the base station to the terminal station, a radio carrier F of about 271 MHz to 274 MHz, which is 9 MHz away from 262 MHz in the uplink direction, has a width of 25 KHz and 112 waves (F1, F2,...). It recognized. Accordingly, in the communication of the digital wireless communication system, the frequencies in the upstream direction f1, f2,..., The downstream directions F1, F2,. Each system can use one or a plurality of radio carriers as control carriers and the rest as communication carriers according to the scale.

  Furthermore, each radio carrier is configured by a frame as shown in FIG. 6, and after the frame is further divided into four slots, 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 for performing connection control of a wireless line, and the communication channel S is a channel for performing a telephone call 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.

  Next, a communication connection example between the control table 602 and the terminal station 604-1 in the communication system shown in FIG. 4 will be described. Communication between the control console 602 and the terminal station 604-1 is managed by the line control device 601, and controls such as response to a connection request between the control console 602 and the terminal station 604-1, connection of the communication path, and termination management. It is carried out. Here, the communication path means a transmission line 605 such as a wired line or a micro line between the line control device 601 and the base station 603-1 and a wireless line between the base station 603-1 and the terminal station 604-1. These communication paths usually have a plurality of lines such as a voice line, a data line, and a maintenance line. The radio link between the base station 603-1 and the terminal station 604-1 is, for example, duplex communication between a base station and a terminal station using a pair wave of an uplink radio carrier f1 and a downlink radio carrier F1, for example, Duplex communication is performed using a communication channel S1 (shown in FIG. 6) of the uplink radio carrier f1 and a communication channel S1 of the downlink radio carrier F1 for voice communication.

  Next, in the communication system shown in FIG. 4, for example, when the terminal station 604-1 is communicating with the terminal station 604-2 via the base station 603-1, control communication is performed from the control table 602. The case will be described. In the terminal station-terminal station simplex communication between the terminal station 604-1 and the terminal station 604-2, the uplink from the terminal station 604-1 to the base station 603-1 uses the radio carrier f1, and the base station The downlink from 603-1 to the terminal station 604-2 uses the radio carrier F1. The uplink from the terminal station 604-2 to the base station 603-1 uses the radio carrier f1, and the downlink from the base station 603-1 to the terminal station 604-1 uses the radio carrier F1. The terminal stations 604-1 and 604-2 perform simplex communication by the press talk method.

  At this time, for example, in an emergency for disaster prevention, control communication is performed from the control table 602 to forcibly make a call to, for example, the terminal station 604-1. If the terminal station 604-1 subject to controlled communication is communicating with another terminal station 604-2, when controlled communication is performed from the control table 602, the terminal station 604-1 and the terminal station 604-2 are connected. After the communication is disconnected, controlled communication with the terminal station 604-1 is performed.

JP 2007-60385 A

  In the conventional wireless communication system described above, when a terminal station subject to control communication is communicating with another terminal station, if control communication is performed from the control station to the terminal station targeted for control communication, The terminal station that is not the target of controlled communication, which was the communication partner of the target terminal station, is simply disconnected, and is disconnected due to forced disconnection due to controlled communication or due to unstable communication such as radio wave conditions. I can't know what was done. For this reason, there has been a problem that a call is made again from a terminal station that is not subject to controlled communication, and the line is congested in an emergency where controlled communication is required.

  The present invention has been made to solve such a conventional problem, and when forced disconnection by controlled communication is performed, a terminal station that is not subject to controlled communication is forcedly disconnected by controlled communication. An object of the present invention is to provide a wireless communication system capable of knowing.

A typical configuration of the present invention for solving the above problems is as follows. That is,
A wireless communication system comprising a plurality of terminal stations, a base station that performs wireless communication with the plurality of terminal stations, and a control station connected to the base station,
The control station transmits a disconnection notification for forcibly disconnecting the communication between a plurality of terminal stations to the communicating terminal station via the base station, and the communicating terminal After disconnecting the station communication, among the terminal stations that were performing the communication between the terminal stations, to establish control communication with one terminal station,
Among the terminal stations that have received the disconnection notification, terminal stations other than the terminal station that establishes the control communication with the control station indicate on the display unit of the terminal station that the control station has forcibly disconnected. A wireless communication system characterized by displaying.

  According to the present invention, when a forced disconnection by control communication is performed, a terminal station that is not subject to control communication can know that it is a forced disconnection by control communication. It is possible to prevent the line from being congested due to correction.

It is a figure which shows the structure of the control station and base station which concern on the Example of this invention. It is a figure which shows the structure of the terminal station which concerns on the Example of this invention. It is a figure which shows the forced cutting sequence which concerns on the Example of this invention. It is a figure which shows the schematic structural example of a municipal digital mobile communication system. It is a figure which shows the radio | wireless carrier frequency allocation of a municipal digital mobile communication system. It is a figure for demonstrating the frame structure of a municipal digital mobile communication system.

  An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a block diagram showing a schematic configuration of a control table 602, a line control device 601 and a base station 603 in one embodiment of the present invention. A control station is composed of the control table 602 and the line control device 601. FIG. 2 shows a block diagram of a schematic configuration of the terminal station 604 (terminal stations 604-1, 604-2,... 604-N are representatively shown). The configuration of the wireless communication system configured in FIG. 1 and FIG. 2 is the same as that in FIG. 4 except for the portion related to the present invention, and detailed description thereof will be omitted.

The configuration of FIG. 1 will be described. The control table 602 includes a processing device 101, a storage unit 102, a display unit 103, and an operation unit 104. The line control device 601 is configured by a control unit 105 and a storage unit 106 configured by a CPU or the like, and maintains and manages communication connections and service areas between a plurality of terminal stations 604, and calls (calls) from the terminal stations ) Control or control such as communication route setting.
The base station 603, for example, the base station 603-1, includes a transmission radio 110, a reception radio 111, a control unit 112 including a CPU, a switching unit 113, and a storage unit 114. The wireless device 110 transmits information from the control table 602 to the terminal station 604 using the wireless carrier F1. The receiving radio 111 receives information transmitted from the terminal station 604 using the radio carrier f1. Since the other base stations 603-2,... 603-M have substantially the same configuration, description will be made using the base station 603-1. The operations of the control table 602, the line control device 601, and the base station 603-1 shown in FIG. 1 will be described later.

  FIG. 2 is a block diagram illustrating a schematic configuration of the terminal station 604. The terminal station 604 is a terminal station that represents the terminal stations 604-1, 604-2,... 604-N, and includes mobile stations such as in-vehicle wireless devices or portable wireless devices, but the configuration is almost the same. . Note that the terminal station shown in FIG. 2 uses, for example, a paired wave of an uplink radio carrier f1 and a downlink radio carrier F1, and shows, for example, a radio communication apparatus of the press talk system, but can simultaneously transmit and receive waves. A wireless communication device can also be used. 2, 201 is an antenna for performing transmission / reception with the base station 603, 202 is a changeover switch for switching transmission / reception, 203 is a receiving unit, 204 is a received signal processing unit, 205 is a speaker, and 206 is a control unit. 207, a storage unit, 208 a display unit, 209 an operation unit, 210 a microphone, 211 a transmission signal processing unit, and 212 a transmission unit.

  In the operation of the wireless communication apparatus, first, the operation unit 209 is operated, for example, the terminal number of the other party is input with the numeric keypad, and the call button is pressed. Since the transmission state is entered when the other party leaves, the audio signal input from the microphone 210 is input to the transmission unit 212 after being subjected to predetermined signal processing for transmission by the transmission signal processing unit 211. The signal input to the transmission unit 212 is subjected to predetermined modulation for transmission, converted to a predetermined transmission frequency f1, output from the antenna 201 via the changeover switch 202, and received by the radio station 111 of the base station 603. Sent to.

  On the other hand, the radio carrier F 1 from the transmission radio 110 of the base station 603 is received by the antenna 201 and input to the reception unit 203 via the changeover switch 202. The signal input to the reception unit 203 is amplified at a high frequency, converted to a predetermined intermediate frequency, further demodulated, and supplied to the reception signal processing unit 204. The reception signal processing unit 204 outputs an audio signal from the speaker 205 after predetermined signal processing. In the case of data, the data is displayed on the display unit 208.

  Next, a connection operation between the control table 602 and the terminal station 604 in the wireless communication system configured in FIGS. 1 and 2 will be described. First, the base station 603-1 periodically transmits an empty line signal, and the terminal station 604 in the communication area 608 of the base station 603-1 receives this empty line signal and is synchronized. In this state, the terminal station 604-1 operates the operation unit 209 as described above, for example, dials the number (or ID) of the control table 602, and performs the call operation of the control table 602.

When the terminal station 604-1 performs a call operation, a synchronous burst signal is transmitted from the terminal station 604-1 to the base station 603-1. For example, the synchronization burst signal is transmitted from the antenna 201 of the terminal station 604-1 to the base station 603-1 using the control channel C (shown in FIG. 6) of the radio carrier f1. The receiving radio 111 of the base station 603-1 that has received the synchronous burst signal for calling transmits a transmission right confirmation signal to the control unit 105 of the line control apparatus 601 via the switching unit 113 and the transmission path.
As described above, the line control apparatus 601 performs control such as communication connection between a plurality of terminal stations 604 and maintenance and management of a service area, call control from a terminal station, or setting of a communication route. When the transmission right confirmation signal is received, the free state of the call channel at that time is detected. For example, the availability of the communication channel stores the availability of the communication channel in the communication area of the base station 603-1 in the storage unit 106, and always grasps the availability. Note that the status of the empty channel in the storage unit 106 changes with time, and the latest empty channel information is always stored. When the call channel S (shown in FIG. 6) has an empty channel, for example, the channel S1, the line control device 601 sends a transmission right acceptance signal designating the channel S1, for example, to the transmission path 107 and the switching unit 113. To the transmitting radio 110 of the base station 603-1.
The base station 603-1 transmits a transmission right acceptance signal designating this channel S1 to the terminal station 604-1 on the control channel C of the radio carrier F1 (burst acceptance). The operator of the terminal station 604-1 that has received the burst operates the operation unit 209 to operate the control unit 206 and sets the communication channel S1.

When the communication channel S1 is set in the terminal station 604-1, a call signal is transmitted to the base station 603-1, and the base station 603-1 transmits a call setting signal to the line control device 601. When the line control device 601 receives the call setting signal from the base station 603-1, the line control device 601 transmits a call setting notification from the terminal station 604-1 to the control table 602. For example, the line control device 601 transmits the line information to the display unit 103 of the control table 602. Display. Then, the line control device 601 transmits a call setting acceptance signal to the base station 603-1, and the base station 603-1 transmits a call acceptance signal to the terminal station 604-1. As a result, a communication path is formed between the terminal station 604-1 and the control board 602, and a voice call is performed.
The connection operation between the terminal station 604-1 and the terminal station 604-2 is the same as the connection operation between the above-described control table 602 and the terminal station 604, and the control table 602 in the above description is replaced with the terminal station. What is necessary is just to replace with 604-2.

Next, a forced cutting sequence according to an embodiment of the present invention will be described with reference to FIG. In this forced disconnection sequence, a message including a reason display indicating the reason for call disconnection is notified to the terminal station that is not subject to controlled disconnection that it has been disconnected by forced disconnection through controlled communication. The reason is “forced disconnection by controlled communication”.
As another method, before the forced disconnection, the base station transmits a predetermined voice or sound (such as a beep sound) indicating the forced disconnection by the control communication. For example, a voice message “Forcible disconnection by controlled communication” is transmitted to all terminal stations in a call.
The embodiment shown in FIG. 3 is a case where both the above-mentioned notification by voice before disconnection and the disconnection reason notification by a short message at the time of disconnection are performed. It is sufficient that at least one of the disconnection reason notifications is performed. Note that the disconnection reason notification transmission method is not limited to the short message inserted into the control channel, and a signal indicating the reason for the disconnection may be included in the control channel or the communication channel.

In FIG. 3, during the communication (call) between the terminal station 604-1 and the terminal station 604-2 (step S1), first, on the control stand 602 of the control station, the operator controls the terminal station 604-1 from the operation unit 104. When individual communication is requested (step S2), the control station 601 of the control station that has received the request checks the communication status of the terminal station 604-1. When the communication state of the terminal station 604-1 is in communication, the communication channel used (for example, communication channel S1) is checked.
Here, since the terminal station 604-1 is communicating with the terminal station 604-2 using the communication channel S1, the line control apparatus 601 uses the communication channel S1 with which the terminal station 604-1 is communicating in advance. The voice file stored in the storage unit 102 of the base 602 or the storage unit 106 of the line control device 601 is being communicated with the terminal station 604-1 and the terminal station 604-1 that are the objects of controlled individual communication. It transmits via the base station 603-1 with respect to the terminal station 604-2 which is not the object of a certain control separate communication (steps S3-S5). The contents of this audio file indicate that it is forcibly disconnected by control communication from the control station.
Then, the terminal station 604-1 and the terminal station 604-2 that have received these audio files play the audio file and forcibly disconnect from the speaker 205 of the terminal station 604-1 and the terminal station 604-2 by controlled communication. A sound to that effect is output. The reproduction of the audio file may be executed by superimposing the call sound of the terminal station 604-1 and the terminal station 604-2.

  Next, the line control device 601 transmits a disconnection notification for disconnecting communication between the terminal station 604-1 and the terminal station 604-2 to the base station 603-1 (step S6), and the base station 603-1. Transmits to the terminal station 604-1 and the terminal station 604-2 using the control channel C (steps S7 and S8). Here, the line control device 601 adds a code indicating “forced disconnection for control communication” as a short message to the disconnection notification signal. This code may define a disconnection of control, for example, by bits 001111 representing other normal events in the short message. In the terminal station 604-1 and the terminal station 604-2 that have received the disconnection notification, the control unit 206 disconnects the communication (the terminal station control unit that has received the disconnection notification instead of disconnecting the communication by the line control device). However, a message such as “forced disconnection for control disconnection” is automatically displayed on the display unit 208 of the terminal station 604-1 and the terminal station 604-2. Specifically, the base station 603-1 notifies the terminal station 604-1 and the terminal station 604-2 of radio channel disconnection and disconnection reason notification in a UI (Unnumbered Information) frame that is an unconfirmed operation, and then Sends a skyline signal.

  Then, the base station 603-1 transmits the incoming notification of the controlled individual communication to the terminal station 604-1 using the control channel C based on the instruction from the line control device 601 (step S9). As a result, communication between the control table 602 and the terminal station 604-1 is established. For communication (step S10) between the control table 602 and the terminal station 604-1 after this communication is established, for example, the communication channel S1 with which the terminal station 604-1 has been communicating can be used.

  As described above, according to the present embodiment, since the voice and the message are transmitted not only to the terminal station 604-1 that is the target of the controlled communication but also to the terminal station 604-2 that is not the target of the controlled communication, the terminal station 604 -2 can also reliably know that the communication with the terminal station 604-1 has been forcibly disconnected for control communication. Therefore, the user of the terminal station 604-2 does not make a call to the terminal station 604-1 again, and line congestion can be suppressed. In addition, since voice is transmitted during communication, the user of the terminal station 604-2 can predict that the user will be forcibly disconnected.

The present invention is not limited to individual communication as in the above-described embodiment, but can be applied to cases where forced disconnection is required, such as simultaneous communication and control group communication.
In addition, the present invention is understood not only as a system for executing processing according to the present invention, but also as an apparatus and method, a program for realizing such a method and system, and a recording medium for recording the program. can do.
Further, the present invention may be configured such that the CPU performs control by executing a control program stored in a memory, or may be configured as a hardware circuit.

This specification includes the following inventions.
The first invention is
A wireless communication system comprising a plurality of terminal stations, a base station that performs wireless communication with the plurality of terminal stations, and a control station connected to the base station,
The control station transmits a disconnection notification for forcibly disconnecting the communication between a plurality of terminal stations to the communicating terminal station via the base station, and the communicating terminal After disconnecting the station communication, among the terminal stations that were performing the communication between the terminal stations, to establish control communication with one terminal station,
Among the terminal stations that have received the disconnection notification, terminal stations other than the terminal station that establishes the control communication with the control station indicate on the display unit of the terminal station that the control station has forcibly disconnected. A wireless communication system characterized by displaying.
With this configuration, when a forced disconnection by control communication is performed, a terminal station that is not subject to control communication can know that it is a forced disconnection by control communication. It is possible to prevent the line from being congested due to correction.

The second invention is
The wireless communication system according to the first invention,
The control station, before transmitting the disconnection notification, transmits voice data to the effect that there is a forced disconnection by the control station to the terminal station in communication via the base station,
A wireless communication system, wherein a terminal station other than the terminal station that establishes the control communication with the control station outputs from the speaker of the terminal station that there is a forced disconnection by the control station.
With this configuration, since a voice message indicating that the communication is forcibly disconnected is transmitted during communication, a user of a terminal station other than the terminal station that establishes control communication can predict that the communication will be forcibly disconnected.

  101.. Control table processing device 102.. Control table storage unit 103. Control table display unit 104. Control table operation unit 105.. Line control device control unit 106.. Line control device storage unit 110 ··· Base station transmitting radio, 111 ··· Base station receiving radio, 112 ·· Base station control unit, 113 ·· Base station switching unit, 201 · · Antenna, 202 · · Changeover switch, 203 ··· Reception unit 204 ··· Reception signal processing unit 205 ·· Speaker 206 · · Terminal station control unit 208 · · Terminal station display unit 209 · · Terminal station operation unit 210 · · Microphone · 211 · · Transmission signal Processing unit 212... Transmission unit 601... Line control device 602... Control stand 603... Base station 604.

Claims (1)

A wireless communication system comprising a plurality of terminal stations, a base station that performs wireless communication with the plurality of terminal stations, and a control station connected to the base station,
The control station transmits a disconnection notification for forcibly disconnecting the communication between a plurality of terminal stations to the communicating terminal station via the base station, and the communicating terminal After disconnecting the station communication, among the terminal stations that were performing the communication between the terminal stations, to establish control communication with one terminal station,
Among the terminal stations that have received the disconnection notification, terminal stations other than the terminal station that establishes the control communication with the control station indicate on the display unit of the terminal station that the control station has forcibly disconnected. A wireless communication system characterized by displaying.

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