JP2005065025A - Radio communication system and radio communication terminal used in the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a radio communication system capable of breaking into two-way communication in a plurality of modes. <P>SOLUTION: This radio communication system comprises a step for searching empty channels in a waiting state (S100); a step for notifying a use channel notification command (S104) when a transmission request is made (YES in S102); a step for setting a use channel; a step for transmitting a voice signal (S108); a step for stopping transmission of the voice signal (S114) when an interruption command is received (YES in S110) and when the interruption comes from a master unit (YES in S112); and a step for generating alarm sound (S116) when the interruption does not come from the master unit (NO in S112). <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a wireless communication technology for transmitting and receiving data including audio data between a large number of wireless communication terminals, and more particularly to a wireless communication technology excellent in interrupt processing.

  A large number of wireless communication systems have been built that perform communication (including voice data communication) between specific low-power wireless stations of about 10 mW. For example, in an MCA communication system which is one of such wireless communication systems, a control channel for performing communication between a transmitting station and a called station (receiving station) and actually continuous communication (call) are performed. Communication channel to be used. There are multiple communication channels, and the transmitting station selects and captures an available communication channel before making a call, reports the captured channel to the receiving station, and then uses this empty channel for transmission. Communication is performed between the station and the receiving station.

  Such an MCA communication system does not limit the time during which continuous communication is possible or gives a communication opportunity to many users in order to give a communication opportunity to many users. In order to receive the content of a call with a station, the convenience of the user is enhanced by notifying the communication channel captured by a wireless terminal in a predetermined range. In particular, when there are a large number of wireless terminals, the master station may want to broadcast emergency information related to a disaster to a large number of slave stations all at once. In such a case, there is a need for interrupt processing between wireless communication terminals performing full duplex communication in both directions.

  Japanese Patent Laid-Open No. 2001-313603 (Patent Document 1) discloses that, in a wireless system including a master station and a plurality of terminal stations connected to the master station via a wireless line, Disclosed is a broadcast call system that allows a master station to quickly start broadcast to a terminal station. This broadcast call calling method is a broadcast call calling method for a wireless system that includes a master station and a plurality of terminal stations connected to the master station via a wireless line and equipped with telephones. A step of starting, a step of transmitting a forced disconnection signal for disconnecting the radio line to the terminal station with which the master station is communicating, and a broadcast notification selection calling signal for notifying each terminal station of the start of the simultaneous notification The terminal station that has received the forced disconnection signal outputs a forced disconnection sound to the telephone, and the master station simultaneously transmits a simultaneous notification selection call signal and the terminal station outputs a forced disconnection sound. Including.

According to the simultaneous call calling method disclosed in Patent Document 1, it is possible to simultaneously transmit the broadcast notification selection call signal of the master station and the forced disconnection sound of the terminal station control unit. . As a result, it is possible to shorten the time from the start of simultaneous notification to the start of simultaneous notification in the master station. As a result, the simultaneous call selection call by the master station and the forced disconnection process (forced disconnection sound transmission) by the terminal station control unit can be performed at the same time, so the time from the start of the broadcast to the start of the broadcast Can be shortened.
JP 2001-313603 A

  In the broadcast call system disclosed in Patent Document 1, only a response to a request from a master station is performed, and a radio communication terminal performing bidirectional full-duplex communication between a slave station and a slave station In addition, it is controlled to be forcibly disconnected by forcible interrupt processing from the master station. However, it is not possible to cope with the case where forced disconnection processing from the master station is not necessary.

  For example, a case is assumed in which a conductor (supervisor) among a large number of wireless terminals operates a master unit to perform bidirectional full-duplex communication between slave stations. In this case, the slave station performing the bidirectional communication uses the communication channel used by the control channel as the slave station other than the master station and the slave station performing the bidirectional communication (third slave station). ), The master station and the third slave station can monitor a call between the slave stations performing bidirectional communication. When the call is continuing, the third slave station forcibly disconnects the bidirectional communication between the slave stations instead of forcibly disconnecting the bidirectional communication between the slave stations from the master station. In some cases, it may be desirable to interrupt a call that is ongoing between slave stations. In such a case, the simultaneous call calling method disclosed in Patent Document 1 cannot be used.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a wireless communication system capable of interrupting bi-directional communication performed between two communication terminals in a plurality of modes. And a wireless communication terminal used in the system.

  The radio communication system according to the first invention includes a radio communication terminal whose attribute is set as a master station and three or more radio communication terminals whose attribute is set as a slave station. In this wireless communication system, a wireless communication terminal set as a master station and a wireless communication terminal set as a slave station have the same configuration. The first wireless communication terminal and the second wireless communication terminal are set as slave stations that communicate bidirectionally. The third wireless communication terminal is set as the master station. A fourth wireless communication terminal other than the first to third is set as a slave station. A wireless communication terminal constituting the wireless communication system has a transmission means for transmitting a control signal and a voice signal only when there is a voice transmission request of an operator of the wireless communication terminal to a wireless communication terminal other than itself, A control signal is received from a first receiving means for receiving an audio signal from the first wireless communication terminal, a second receiving means for receiving an audio signal from the second wireless communication terminal, and a wireless communication terminal other than itself. Based on attributes of the third receiving means for receiving, the notifying means for notifying the operator of the wireless communication terminal of information, and the wireless communication terminal that is the source of the control signal received by the third receiving means And a control means for controlling the transmission means and the notification means.

  According to the first invention, the wireless communication system includes a first wireless communication terminal and a second wireless communication terminal that are set as slave stations and perform bidirectional communication with each other, and a third wireless set as a parent station. It consists of a communication terminal and a plurality of other wireless communication terminals. The wireless communication terminal that is characteristic in the wireless communication system according to the first invention is the first wireless communication terminal or the second wireless communication terminal. In the case of the first wireless communication terminal, bidirectional communication is realized by the transmission means and the second reception means, and in the case of the second wireless communication terminal, bidirectional communication is realized by the transmission means and the first reception means. . In this state, when receiving the control signal from the third wireless communication terminal or the fourth wireless communication terminal, the control means transmits the attribute (master station, slave station) of the wireless communication terminal that is the source of the received control signal. The transmission means and the notification means are controlled based on the above. At this time, for example, if the source of the received control signal is the third wireless communication terminal and the attribute is the master station, forcible processing for forcibly stopping the function of the transmission means is executed, Communication is performed between the third wireless communication terminal serving as the master station and the first wireless communication terminal or the second wireless communication terminal serving as the slave station. If the attribute of the wireless communication terminal that is the source of the received control signal is a slave station, we want to interrupt bi-directional communication between the first wireless communication terminal and the second wireless communication terminal instead of such forced processing. This request (existence of the fourth wireless communication terminal as a slave station) is notified to the operator by sounding an alarm. In this way, it is possible to control not only forcible processing but also processing different from the forcible processing. As a result, it is possible to provide a wireless communication system capable of interrupting bidirectional communication performed between two communication terminals in a plurality of modes.

  In the wireless communication system according to the second invention, in addition to the configuration of the first invention, the control means stops the function of the transmission means when the attribute of the wireless communication terminal that is the source of the control signal is a master station And means for causing.

  The wireless communication terminal characterized in the wireless communication system according to the second invention is the first wireless communication terminal or the second wireless communication terminal. According to the second invention, when the attribute of the wireless communication terminal that is the source of the control signal is the master station, the function of the sending means is stopped, and the third wireless communication terminal that is the master station and the slave station Communication with the first wireless communication terminal or the second wireless communication terminal is performed. For example, in the case where the conductor (supervisor) is an operator of a third wireless communication terminal that is a master station, bidirectional operations performed between the first wireless communication terminal and the second wireless communication terminal The communication can be forcibly interrupted, and the conductor can give accurate instructions. In particular, it is possible to forcibly interrupt bidirectional communication when the first wireless communication terminal detects ambient noise or the like as voice instead of voice and continues to transmit to the second wireless communication terminal.

  In the radio communication system according to the third invention, in addition to the configuration of the first invention, the control means is predetermined by the operator that the attribute of the radio communication terminal that is the source of the control signal is a slave station. Means for controlling the notification means so as to notify the received information.

  The wireless communication terminal characterized by the wireless communication system according to the third invention is the first wireless communication terminal or the second wireless communication terminal. According to the third invention, if the attribute of the wireless communication terminal that is the source of the received control signal is a slave station, the request to interrupt bidirectional communication between the first wireless communication terminal and the second wireless communication terminal Since the operator of the first wireless communication terminal and the operator of the second wireless communication terminal can be aware of (the presence of the fourth wireless communication terminal which is a slave station), the operator who has noticed the presence of the operator When the transmission is stopped (stops talking or the PTT switch is released), the transmission of the voice signal by the transmission means is stopped and the frequency becomes free so that the operator can use the fourth wireless communication terminal for bidirectional communication. Can interrupt.

  In the radio communication system according to the fourth invention, in addition to the configuration of the third invention, the predetermined information is information indicating that there is a call request from the fourth radio communication terminal.

  The wireless communication terminal characterized in the wireless communication system according to the fourth invention is the first wireless communication terminal or the second wireless communication terminal. According to the fourth invention, the operator of the first wireless communication terminal and the operator of the second wireless communication terminal can notice a call request made by the fourth wireless communication terminal.

  In the wireless communication system according to the fifth invention, in addition to the configuration of any one of the first to fourth inventions, the fourth wireless communication terminal is a plurality of wireless communication terminals.

  The wireless communication terminal that is characteristic in the wireless communication system according to the fifth invention is the first wireless communication terminal or the second wireless communication terminal. According to the fifth aspect of the present invention, even in the case where a radio communication system is configured from a large number of radio communication terminals, it is possible to interrupt bi-directional communication performed between two communication terminals in a plurality of modes. A wireless communication system can be provided.

  In the radio communication system according to the sixth aspect of the invention, in addition to the configuration of any one of the first to fifth aspects, the radio communication terminal is requested by the operator that the attribute set to itself is the master station. In response, it further includes an interrupt transmission control means for controlling the transmission means so as to transmit a control signal for forcibly stopping transmission to a wireless communication terminal other than itself.

  A wireless communication terminal having characteristics in the wireless communication system according to the sixth aspect of the invention is a third wireless communication terminal. According to the sixth invention, in the third wireless communication terminal set as the master station, the bidirectional communication between the first wireless communication terminal and the second wireless communication terminal received by the operator is performed. When it is desired to forcibly interrupt, a control signal for forcibly stopping the transmission can be transmitted by the interrupt transmission control means, so that the bidirectional communication can be interrupted by the forced processing.

  In the wireless communication system according to the seventh aspect of the invention, in addition to the configuration of any one of the first to fifth aspects, the wireless communication terminal may respond to an operator's request that the attribute set to itself is a slave station. In response, it further includes interrupt transmission control means for controlling the transmission means so as to transmit a control signal for representing a call request to a wireless communication terminal other than itself.

  A wireless communication terminal having characteristics in the wireless communication system according to the seventh invention is a fourth wireless communication terminal. According to the seventh invention, in the fourth wireless communication terminal set as the slave station, the bidirectional communication between the first wireless communication terminal and the second wireless communication terminal received by the operator is performed. If you want to forcibly interrupt, the interrupt transmission control means can send a control signal to inform you that you want to interrupt bi-directional communication, so there is a possibility that you can interrupt bi-directional communication Get higher.

  In the radio communication system according to the eighth invention, in addition to the configuration of the sixth or seventh invention, the interrupt transmission control means includes means for controlling the transmission means in response to an operator's voice request. .

  The wireless communication terminal characterized by the wireless communication system according to the eighth invention is a third wireless communication terminal or a fourth wireless communication terminal. According to the eighth invention, the operator of the third wireless communication terminal or the fourth wireless communication terminal only generates a sound, and the control signal for forcibly stopping the transmission is transmitted by the interrupt transmission control means. Can be interrupted to bi-directional communication by forcible processing, or a control signal for notifying the user that he / she wants to interrupt bi-directional communication can be transmitted. A possibility of interrupting communication can be generated.

  In the radio communication system according to the ninth invention, in addition to the configuration of any one of the first to eighth inventions, the radio communication terminal is used in the radio communication system from a plurality of predetermined frequencies. It further includes detection means for detecting a non-existing frequency and transmission notification control means for controlling the transmission means so as to transmit a control signal including information regarding the frequency to wireless communication terminals other than itself.

  A wireless communication terminal having characteristics in the wireless communication system according to the ninth aspect of the invention is the first wireless communication terminal. According to the ninth aspect of the invention, a control signal including information on the detected vacant frequency is transmitted, and at the reception side of the control signal, at least one of transmission and reception is communicated using the frequency. The second wireless communication terminal that has received the control signal from the first wireless communication terminal can set both reception and transmission frequencies based on the control signal. The third wireless communication terminal or the fourth wireless communication terminal that has received the control signal from the first wireless communication terminal can set the reception frequency based on the control signal.

  In the radio communication system according to the tenth invention, in addition to the configuration of the ninth invention, the transmission notification control means includes means for controlling the transmission means in response to a request by the operator's voice.

  A wireless communication terminal having characteristics in the wireless communication system according to the tenth aspect of the invention is the first wireless communication terminal. According to the tenth aspect of the invention, the operator of the first wireless communication terminal can generate a sound or can press the PTT switch to transmit a control signal related to the frequency used for wireless communication by the transmission notification control means. Thus, bidirectional communication can be realized.

  In the radio communication system according to the eleventh invention, in addition to the configuration of any one of the first to eighth inventions, the radio communication terminal uses the third receiving means to transmit information about the frequency from radio communication terminals other than itself. When the control signal including is received, setting means for setting a frequency used for at least one of transmission and reception of the audio signal is further included.

  The wireless communication terminal characterized in the wireless communication system according to the eleventh invention is a first wireless communication terminal, a second wireless communication terminal, or a third wireless communication terminal. According to the eleventh aspect, when a control signal is received, at least one of transmission and reception is set to use the frequency. The second wireless communication terminal that has received the control signal from the first wireless communication terminal sets both reception and transmission frequencies based on the control signal. The third wireless communication terminal or the fourth wireless communication terminal that has received the control signal from the first wireless communication terminal sets the reception frequency based on the control signal. As a result, the first wireless communication terminal and the second wireless communication terminal can realize bidirectional communication, and the third wireless communication terminal and the fourth wireless communication terminal are connected to the first wireless communication terminal and the second wireless communication terminal. It is possible to receive bi-directional communication performed with other wireless communication terminals.

  In the radio communication system according to the twelfth invention, in addition to the configuration of any one of the first to eighth inventions, the radio communication terminals are divided into a plurality of groups. When a wireless communication terminal receives a control signal including information on frequency from a wireless communication terminal belonging to the same group other than itself by the third receiving means, the frequency used for at least one of transmission and reception of a voice signal It further includes setting means for setting.

  The wireless communication terminal characterized in the wireless communication system according to the twelfth invention is a first wireless communication terminal, a second wireless communication terminal, or a third wireless communication terminal. According to the twelfth aspect, when there are thousands of wireless communication terminals, bidirectional communication that is completely unrelated is received, so the wireless communication terminals are divided into groups to constitute a system. For this reason, it is possible to construct a wireless communication system by excluding bidirectional communication of two wireless communication terminals belonging to another group different from the self that has nothing to do with itself.

  In the wireless communication system according to the thirteenth aspect, in addition to the configuration of the ninth aspect, the wireless communication terminal further includes means for storing information about the frequency used in the wireless communication system. The detecting means includes means for detecting an unused frequency based on the information about the used frequency.

  According to the thirteenth invention, for example, when a free channel search is performed, information on a frequency used in a group different from the group to which the self belongs is received as a command and stored. If a free channel search is performed based on this stored information, it is possible to quickly search for a free channel by skipping the used channel.

  A radio communication terminal according to a fourteenth aspect of the invention is a radio communication terminal used for the radio communication system in the configuration of the first to thirteenth aspects of the invention.

  According to the fourteenth aspect, the first wireless communication terminal, the second wireless communication terminal, the third wireless communication terminal, and the fourth wireless communication terminal used in the first to thirteenth wireless communication systems described above. Can be provided.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same parts are denoted by the same reference numerals. Their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

  With reference to FIG. 1, the overall configuration of the radio communication system according to the present embodiment will be described.

  As shown in FIG. 1, the radio communication system according to the present embodiment is composed of a plurality of groups including a plurality of radio communication terminals. For example, as shown in FIG. 1, a wireless communication system is configured by a plurality of groups such as group (1), group (2), group (3), group (4), group (5),. The number of groups in the wireless communication system and the number of wireless communication terminals included in the group are not particularly limited. For example, the number of groups may be limited to about 16 groups.

  With reference to FIG. 2, the structure of the radio | wireless communications system in each group is demonstrated. The wireless communication terminal 100, the wireless communication terminal 200, the wireless communication terminal 300, and the wireless communication terminal 400 illustrated in FIG. 2 are all wireless communication terminals having the same structure. Thereafter, the wireless communication terminal 100 is the first wireless communication terminal 100, the wireless communication terminal 200 is the second wireless communication terminal 200, the wireless communication terminal 300 is the third wireless communication terminal 300, and the wireless communication terminal 400 is the first. 4 will be described.

  FIG. 2 shows the configuration of group (1). For example, it is assumed that five wireless communication terminals belong to this group (1). The first wireless communication terminal 100 performs bidirectional communication with the second wireless communication terminal 200 by full-duplex communication. At this time, the audio signal is communicated bidirectionally. In the first wireless communication terminal 100, the L frequency of the channel CH (X) is selected as the transmission frequency, and the H frequency of the channel CH (X) is selected as the reception frequency.

  In second radio communication terminal 200 that performs full-duplex communication with first radio communication terminal 100, the L frequency of channel CH (X) is selected as the reception frequency, and the H frequency of channel CH (X) is selected as the transmission frequency. doing. That is, the transmission frequency of the first wireless communication terminal 100 is the same as the reception frequency of the second wireless communication terminal, and the reception frequency of the first wireless communication terminal 100 is the same as the transmission frequency of the second wireless communication terminal 200. . Thereby, the first wireless communication terminal 100 and the second wireless communication terminal 200 can perform full-duplex communication.

  In third radio communication terminal 300 and fourth radio communication terminal 400, the L frequency of channel CH (X) is set as the reception frequency, and the H frequency of channel CH (X) is set as the reception frequency. As a result, the third radio communication terminal 300 and the fourth radio communication terminal 400 are the audio signals respectively transmitted from the first radio communication terminal 100 and the second radio communication terminal 200 performing full duplex communication. Can be received.

  FIG. 3 illustrates a list of communication channels used in the radio communication system according to the present embodiment. As shown in FIG. 3, there are 28 channels CH (X) from X = 1 to 28. Among them, the 19th channel is a control channel called C channel.

  In each channel, two frequencies, L Band on the lower frequency side and H Band on the higher frequency side, are defined. The table shown in FIG. 3 is an example, and the present invention is not limited to this frequency.

  With reference to FIG. 4, a control block diagram of a radio communication terminal used in the radio communication system according to the present embodiment will be described. The control block diagram shown in FIG. 4 is a structure common to all of the first wireless communication terminal 100, the second wireless communication terminal 200, the third wireless communication terminal 300, and the fourth wireless communication terminal 400.

  As shown in FIG. 4, the wireless communication terminal 100 (hereinafter, in the description of FIG. 4, the first wireless communication terminal 100 will be described as a representative, but the second wireless communication terminal and the third wireless communication terminal will be described. And the fourth wireless communication terminal are the same) H Channel of channel CH (1) to channel CH (18), control channel CH (C), channel CH (20) to channel CH (28), and A transmitting unit 104 that transmits an audio signal and a control signal using the frequency of L Band, a storage unit 106 that stores a program executed by the control unit 102 and various data, and a voice uttered by an operator of the wireless communication terminal 100 A voice input unit 108 including a microphone and the like, a voice output unit 110 including a speaker that outputs voice based on a voice signal received from a two-way communication partner, and a voice input Based on the audio signal input from unit 108, a VOX circuit unit 112 that executes a predetermined process (for example, sends an activation signal to control unit 102) and an operation unit 114 such as a PTT switch are included.

  Although the above-described wireless communication terminal 100 has been described as including a microphone and a speaker, the present invention is not limited to this. That is, the microphone and the speaker may be externally attached to the wireless communication terminal 100 or may be built in the wireless communication terminal 100.

  The wireless communication terminal 100 further includes a receiving unit 120 including a receiving unit (1) 121, a receiving unit (2) 122, a receiving unit (3) 123, and a receiving unit (4) 124. These transmission unit 104, storage unit 106, audio input unit 108, audio output unit 110, VOX circuit unit 112, operation unit 114, and reception unit 120 are all connected to the control unit 102.

  When the first wireless communication terminal and the second wireless communication terminal are communicating in two directions, only when the audio signal is input from the audio input unit 108 in any of the wireless communication terminals and the VOX circuit unit 112 detects it. Alternatively, only when the PTT switch of the operation unit 114 is pressed, a voice signal is transmitted using the transmitting unit 104 using the H Band or L Band of the set channel. When the voice input is interrupted, the transmission of the voice signal using the transmitting unit 104 is stopped, and the H Band or L Band frequency of the set channel is vacated. At that time, the third wireless communication terminal or the fourth wireless communication terminal can transmit an audio signal to the first wireless communication terminal or the second wireless communication terminal using the frequency.

  The control unit 102 includes a CPU, a clock, and a timer that read and execute a program stored in the storage unit 106.

  The receiving unit (1) 121 receives audio signals transmitted using the frequency of the H Band of the channels CH (1) to CH (18) and the channels CH (20) to CH (28). The receiving unit (2) 122 receives a voice signal transmitted by the frequency of L Band of the channels CH (1) to CH (18) and the channels CH (20) to CH (28).

  The receiving unit (3) 123 receives a control signal transmitted from the H Band frequency of the channel CH (C). The receiving unit (4) 124 receives a control signal transmitted using the L Band frequency of the channel CH (C).

  The first radio communication terminal 100 and the second radio communication terminal 200 are set as slave stations and perform two-way communication. The third wireless communication terminal 300 is set as a master station and the fourth wireless communication terminal 400 is set as a slave station, and is performed between the first wireless communication terminal 100 and the second wireless communication terminal 200. Receiving audio signals in two-way communication.

  With reference to FIG. 5, a control structure of a program executed by control unit 102 of first wireless communication terminal 100 according to the present embodiment will be described.

  In step (hereinafter abbreviated as S) 100, control unit 102 of first wireless communication terminal 100 searches for an empty channel as a standby state. In S102, control unit 102 determines whether or not a call request has been made. This is determined by detecting that the voice of the operator is input from the voice input unit 108 by the VOX circuit unit 112 or pressing the PTT switch of the operation unit 114. If there is a transmission request (YES in S102), the process proceeds to S104. If not (NO in S102), the process returns to S100 to continue the standby state.

  In S104, control unit 102 notifies the use channel notification command to the wireless communication terminal existing in the wireless communication area using channel CH (C). At this time, the identification information of the group to which the self belongs stored in the storage unit 106 is also notified.

  In S106, control unit 102 sets a use channel. In S108, control unit 102 transmits an audio signal.

  In S110, control unit 102 determines whether or not an interrupt command has been received on channel CH (C). When an interrupt command is received on channel CH (C) (YES in S110), the process proceeds to S112. If not (NO in S110), the process proceeds to S118.

  In S112, control unit 102 determines whether or not the interrupt is from the parent device. If the interrupt is from the parent device (YES in S112), the process proceeds to S114. If not (NO in S112), the process proceeds to S116.

  In S114, control unit 102 stops the transmission of the audio signal. That is, if the transmission request is stopped without continuing before the timeout, the function of the transmission unit 104 is stopped. That is, the audio signal is transmitted using the set channel frequency only when there is a transmission request. After the process in S114, the process ends.

  In S116, control unit 102 causes sound output unit 110 to generate an alarm sound. At this time, the sound output unit 110 generates an alarm sound that overlaps with the sound output based on the sound signal of the two-way communication partner. After the process in S116, the process returns to S108.

  In S118, control unit 102 determines whether or not the outgoing call request is continued. If the transmission request continues (YES in S118), the process proceeds to S120. If not (NO in S118), the process proceeds to S114.

  In S120, control unit 102 determines whether or not a timeout has been detected. This determination is made when a time-out is detected when, for example, 3 minutes elapses from the outgoing call request in S102. If a timeout is detected (YES in S120), the process proceeds to S122. If not (NO in S120), the process returns to S108.

  In S122, control unit 102 stops transmitting the audio signal. In S124, control unit 102 searches for an empty channel. Thereafter, the process returns to S102.

  Note that the processing of S120 to S124 is processing performed to avoid occupying the use of the same channel for a long time based on the standard of the radio equipment for the specific low power radio station radio telephone.

  With reference to FIG. 6, a control structure of a program executed in second radio communication terminal 200 of the radio communication system according to the present embodiment will be described. In the flowchart shown in FIG. 6, the same steps as those in the flowchart shown in FIG. 5 are given the same step numbers. The processing for them is the same. Therefore, detailed description thereof will not be repeated here.

  In S200, control unit 102 of second wireless communication terminal 200 determines whether or not a use channel notification command has been received on channel CH (C). When the used channel notification command is received from first radio communication terminal 100 on channel CH (C) (YES in S200), the process proceeds to S202. If not (NO in S200), the process proceeds to S100, and the standby state is continued.

  In S202, control unit 100 determines whether or not it is a used channel notification command transmitted from a wireless communication terminal belonging to the same group. If it is a used channel notification command from the wireless communication terminals of the same group (YES in S202), the process proceeds to S204. Otherwise (NO in S202), this process ends.

  In S204, control unit 102 sets a use channel based on the received use channel notification command. In S206, control unit 102 determines whether an audio signal has been received from first wireless communication terminal 100 or not. If an audio signal is received (YES in S206), the process proceeds to S208. If not (NO in S206), this process ends. In S208, control unit 102 outputs sound.

  In S210, control unit 102 determines whether or not an interrupt command has been received from third wireless communication terminal 300 or fourth wireless communication terminal 400 on channel CH (C). If the interrupt command is received on channel CH (C) (YES in S210), the process proceeds to S212. If not (NO in S210), the process returns to S206.

  In S212, control unit 102 determines whether or not the interrupt signal is from the parent device. If the interrupt signal is from the parent device (YES in S212), this process ends. If not (NO in S212), the process proceeds to S214.

  In S214, control unit 102 generates an alarm sound. Thereafter, the process returns to S208.

  With reference to FIG. 7, a control structure of a program executed in control unit 102 of third wireless communication terminal 300 or fourth wireless communication terminal 400 in the wireless communication system according to the present embodiment will be described. In the flowchart shown in FIG. 7, the same steps as those shown in FIG. 5 or FIG. 6 are given the same step numbers. The processing for them is the same. Therefore, detailed description thereof will not be repeated here.

  In S300, control unit 102 of third wireless communication terminal 300 or fourth wireless communication terminal 400 determines whether or not there is an interrupt request. For example, the determination of the interrupt request is performed based on the information input from the operation unit 114 and the presence of the audio signal detected by the VOX circuit unit 112. If there is an interrupt request (YES in S300), the process proceeds to S302. If not (NO in S300), the process returns to S206.

  In S <b> 302, control unit 102 determines whether or not the master unit is set based on the information stored in storage unit 106. If it is set as the parent device (YES in S302), the process proceeds to S304. If not (NO in S302), the process proceeds to S306.

  In S304, control unit 102 transmits a transmission forced stop command to first wireless communication terminal 100 or second wireless communication terminal 200 through channel CH (C).

  In S306, control unit 102 transmits an interrupt request notification command to first wireless communication terminal 100 or second wireless communication terminal 200 through channel CH (C).

  An operation of the radio communication system according to the present embodiment based on the above-described structure and flowchart will be described.

[Operation for interrupt requests from the master unit]
Hereinafter, operations of the first wireless communication terminal and the second wireless communication terminal in response to an interrupt request from the third wireless communication terminal 300 set as the parent device will be described.

  In FIG. 8, the third wireless communication terminal 300 set as the master unit for the first wireless communication terminal 100 and the second wireless communication terminal 200 performing bidirectional communication by full-duplex communication. Indicates when an interrupt is requested.

  When the operator of third wireless communication terminal 300 makes an interrupt request (YES in S300), since it is set as a parent device (YES in S302), the outgoing forced stop command is channel CH (C), It is transmitted to the first wireless communication terminal 100 and the second wireless communication terminal 200 (S304).

  In first radio communication terminal 100, the interrupt command is received on channel CH (C) (YES in S110), and since it is an interrupt from the base unit (YES in S112), the transmission of the voice signal is stopped. (S114).

  Thereby, even when the transmission from the first wireless communication terminal 100 continues to be executed (when the noise is continuously transmitted), the forced transmission stop command from the third wireless communication terminal 300 is issued. By receiving, the function of the transmission unit 104 is stopped, so that full-duplex communication is stopped.

  On the other hand, second radio communication terminal 200 receives an interrupt command on channel CH (C) (YES in S210) and is an interrupt from the parent device (YES in S212), so that no particular processing is performed. As described above, since the function of the transmitting unit 104 of the first wireless communication terminal 100 is stopped, full-duplex communication between the first wireless communication terminal 100 and the second wireless communication terminal 200 is stopped. Has been. Note that, when an interrupt command is received from the parent device, the operation of the transmitting unit 104 of the second wireless communication terminal 200 may be stopped.

  In this way, as shown in FIG. 8, when the first wireless communication terminal 100 and the second wireless communication terminal 200 perform bidirectional full-duplex communication, When the third wireless communication terminal 300 transmits a transmission forced stop command through the channel CH (C), the first wireless communication terminal 100 that has received the control signal stops the function of the transmission unit 104 and the first wireless communication terminal 100. And full-duplex communication between the second wireless communication terminal 200 and the second wireless communication terminal 200 are stopped. Therefore, full-duplex communication can be performed between the second radio communication terminal 200 and the third radio communication terminal 300 using the L frequency of the channel CH (X). As a result, the third wireless communication terminal 300 forcibly interrupts the communication between the first wireless communication terminal 100 and the second wireless communication terminal 200 performing bidirectional full-duplex communication. Can do.

[Interrupt operation by slave unit]
Hereinafter, operations of the first wireless communication terminal and the second wireless communication terminal in response to an interrupt request from the fourth wireless communication terminal 400 set as a slave unit will be described.

  FIG. 9 shows the fourth wireless communication terminal 400 set as a slave unit for the first wireless communication terminal 100 and the second wireless communication terminal 200 performing bidirectional communication by full-duplex communication. Indicates when an interrupt is requested.

  When the operator of fourth wireless communication terminal 400 makes an interrupt request (YES in S300), since it is set as a slave (NO in S302), the interrupt request notification command is channel CH (C). It is transmitted to the first wireless communication terminal 100 and the second wireless communication terminal 200 (S306).

  In first wireless communication terminal 100, the interrupt command is received on channel CH (C) (YES in S110) and is not an interrupt from the parent device (NO in S112). (S116).

  On the other hand, second radio communication terminal 200 receives the interrupt command on channel CH (C) (YES in S210), and the interrupt command is not an interrupt command from the parent device (NO in S212). An alarm sound is output from the audio output unit 110 (S214).

  In this way, as shown in FIG. 9, the fourth wireless communication terminal 400 is set as a slave unit, and the interrupt request notification command is sent to the first wireless communication terminal performing bidirectional full-duplex communication. When it is transmitted to the second wireless communication terminal, an alarm sound is transmitted both in the first wireless communication terminal 100 and in the second wireless communication terminal 200. For example, the alarm sound is detected by the operator of the first wireless communication terminal 100 and the operator of the second wireless communication terminal 200 as a warning sound, and the operator of the first wireless communication terminal or the second wireless communication terminal Because the operator temporarily stops the call, the frequency of bidirectional full-duplex communication is vacant. Therefore, the operator can bidirectionally communicate with the fourth wireless communication terminal 400 set as the slave unit. Full-duplex communication.

  As described above, according to the radio communication system according to the present embodiment, for the interrupt process from the master unit, the function of the transmission unit is stopped and the full duplex communication is forcibly stopped. In response to an interrupt request from the slave unit, the operator is notified that there is a communication request from the slave unit without performing such forced processing. In this way, it is possible to control not only forcible communication interruption processing but also processing different from the forcible processing. As a result, it is possible to interrupt the bidirectional communication performed between the two wireless communication terminals in a plurality of modes.

  The empty channel search may be performed as follows. For example, when a free channel search is performed, information on a frequency used in a group different from the group to which the self belongs is received as a command and stored. Based on this stored information, when searching for an empty channel, for example, the used channel is skipped to search for an empty channel. In this way, a free channel can be found quickly.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

It is a figure which shows the whole structure of the radio | wireless communications system which concerns on embodiment of this invention. It is a figure which shows the structure of the group (1) shown in FIG. It is a figure which shows the list of the communication channels used in the radio | wireless communications system which concerns on embodiment of this invention. It is a control block diagram of the radio | wireless communication terminal which concerns on embodiment of this invention. It is a flowchart which shows the control structure of the program of the transmission process performed in the radio | wireless communication terminal which concerns on embodiment of this invention. It is a flowchart which shows the control structure of the program of the reception process performed in the radio | wireless communication terminal which concerns on embodiment of this invention. It is a flowchart which shows the control structure of the program of the interrupt request process performed in the radio | wireless communication terminal which concerns on embodiment of this invention. It is a figure which shows operation | movement when the radio | wireless communication terminal set as a main | base station performs the interruption process in the radio | wireless communications system which concerns on embodiment of this invention. It is a figure which shows operation | movement when the radio | wireless communication terminal set as a sub_station | mobile_unit performs the interruption process in the radio | wireless communications system which concerns on embodiment of this invention.

Explanation of symbols

  100 first wireless communication terminal, 102 control unit, 104 transmission unit, 106 storage unit, 108 voice input unit, 110 voice output unit, 112 VOX circuit unit, 114 operation unit, 120 reception unit, 121 reception unit (1), 122 receiver (2), 123 receiver (3), 124 receiver (4), 200 second wireless communication terminal, 300 third wireless communication terminal, 400 fourth wireless communication terminal.

Claims (14)

A wireless communication system including a wireless communication terminal having an attribute set as a master station and three or more wireless communication terminals having an attribute set as a slave station,
The wireless communication terminal set as the master station and the wireless communication terminal set as the slave station have the same configuration, and the first wireless communication terminal and the second wireless communication terminal communicate bidirectionally. As a slave station, a third wireless communication terminal is set as a master station, and a fourth wireless communication terminal other than the first to third is set as a slave station.
The wireless communication terminal is
A transmission means for transmitting a control signal to a wireless communication terminal other than itself, and for transmitting a voice signal only when there is a voice transmission request from an operator of the wireless communication terminal;
First receiving means for receiving an audio signal from the first wireless communication terminal;
Second receiving means for receiving an audio signal from the second wireless communication terminal;
Third receiving means for receiving a control signal from a wireless communication terminal other than itself;
Informing means for informing the operator of the wireless communication terminal of information,
A wireless communication system, comprising: a control means for controlling the transmission means and the notification means based on an attribute of a wireless communication terminal that is a transmission source of the control signal received by the third reception means.   The wireless communication system according to claim 1, wherein the control means includes means for stopping the function of the transmission means when the attribute of the wireless communication terminal that is the transmission source of the control signal is a master station.   The control means includes means for controlling the notification means so as to notify the operator of predetermined information when the attribute of the wireless communication terminal that is the source of the control signal is a slave station. The wireless communication system according to claim 1.   The wireless communication system according to claim 3, wherein the predetermined information is information indicating that there is a call request from the fourth wireless communication terminal.   The wireless communication system according to claim 1, wherein the fourth wireless communication terminal is a plurality of wireless communication terminals.   If the attribute set for itself is a master station, the wireless communication terminal transmits a control signal for forcibly stopping transmission to a wireless communication terminal other than itself in response to an operator's request. The wireless communication system according to claim 1, further comprising an interrupt transmission control unit for controlling the transmission unit.   The wireless communication terminal, when the attribute set to itself is a slave station, in response to an operator's request, the wireless communication terminal transmits a control signal for representing a call request to a wireless communication terminal other than itself. The wireless communication system according to claim 1, further comprising interrupt transmission control means for controlling the transmission means.   The wireless communication system according to claim 6 or 7, wherein said interrupt transmission control means includes means for controlling said transmission means in response to a request by an operator's voice. The wireless communication terminal is
Detecting means for detecting a frequency not used in the wireless communication system from a plurality of predetermined frequencies;
The transmission notification control means for controlling the said transmission means so that the control signal containing the information regarding the said frequency may be transmitted to radio | wireless communication terminals other than self, The one in any one of Claims 1-8 Wireless communication system.   The wireless communication system according to claim 9, wherein the transmission notification control means includes means for controlling the transmission means in response to a request by an operator's voice. The wireless communication terminal is
Setting means for setting a frequency to be used for at least one of transmission and reception of an audio signal when receiving a control signal including information on the frequency from a wireless communication terminal other than itself by the third receiving means. The wireless communication system according to claim 1, further comprising: The wireless communication terminals are used in a plurality of groups,
When the third receiving means receives a control signal including information on the frequency from a wireless communication terminal other than the self and belonging to the same group as the self, at least one of transmission and reception of an audio signal is received. The wireless communication system according to any one of claims 1 to 8, further comprising setting means for setting a frequency to be used. The wireless communication terminal further includes means for storing information about a frequency used in the wireless communication system,
The wireless communication system according to claim 9, wherein the detecting means includes means for detecting an unused frequency based on the information about the used frequency.   The wireless communication terminal according to claim 1.

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