JP2009260855A - Wireless communication system - Google Patents

Wireless communication system Download PDF

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Publication number
JP2009260855A
JP2009260855A JP2008109720A JP2008109720A JP2009260855A JP 2009260855 A JP2009260855 A JP 2009260855A JP 2008109720 A JP2008109720 A JP 2008109720A JP 2008109720 A JP2008109720 A JP 2008109720A JP 2009260855 A JP2009260855 A JP 2009260855A
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signal
radio
transmission
emergency call
wireless device
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JP2008109720A
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Japanese (ja)
Inventor
Masae Toko
雅恵 杜紅
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Kenwood Corp
株式会社ケンウッド
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Priority to JP2008109720A priority Critical patent/JP2009260855A/en
Publication of JP2009260855A publication Critical patent/JP2009260855A/en
Application status is Pending legal-status Critical

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Abstract

<P>PROBLEM TO BE SOLVED: To provide a wireless communication system surely receiving a reply by avoiding radio interference caused by a radio wave transmitted from other wireless unit during emergency call origination. <P>SOLUTION: In a wireless communication system constituted of a first wireless unit that transmits an emergency call origination signal and a second wireless unit that receives the emergency call origination signal transmitted from the first wireless unit, when receiving the emergency call origination signal transmitted from the first wireless unit, the second wireless unit decides whether the emergency call origination signal is addressed to the second wireless unit itself and if it is decided that the emergency call origination signal is not addressed to the second wireless unit itself, a call originating operation is inhibited just for a predetermined period of time, whereby radio interference caused by a radio wave transmitted from the other wireless unit during emergency call origination is avoided, thereby surely receiving a reply. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a radio communication system capable of avoiding radio wave interference caused by radio waves transmitted from another radio device during emergency transmission.

In a conventional wireless communication system, when a plurality of wireless devices transmit radio waves at the same frequency at the same time, radio interference may occur and communication may not be established. For example, when a reply is made from a radio that is an emergency call partner (hereinafter referred to as a specific call destination) to a radio that has made an emergency call, the radio wave stronger than the reply radio wave from the other radio If there is any interference, the reply may not arrive.
Here, an emergency call is an emergency call that is automatically sent when an emergency situation occurs. For example, to notify the surrounding base stations and radios of the occurrence of a fire when a fire occurs. An emergency message is sent. The outgoing channel used when making an emergency call is the same as the outgoing channel used when making a normal call.

FIG. 11 is an explanatory diagram showing an example of communication at the time of emergency call in the wireless communication system according to the related art. The radio devices 200a, 200b, and 200c are radio devices that use the same frequency. The wireless device 200a is a transmitting side that transmits an emergency transmission signal (hereinafter referred to as a transmitting side wireless device 200a), and the wireless devices 200b and 200c are reception sides that receive an emergency transmission signal (hereinafter referred to as receiving side wireless devices 200b and 200c). ). Note that the wireless device 200 according to the related art can be either a transmitting-side wireless device or a receiving-side wireless device.
As shown in FIG. 11, when the transmitting side radio device 200a makes an emergency call of the signal SN1 with the receiving side radio device 200b as a specific destination, the receiving side radio device 200b receives the signal SN1. At the same time, the receiving-side radio device 200c also receives the signal SN1.
Receiving-side radio apparatus 200b that has received signal SN1 as the specific transmission destination returns signal SN2 to transmitting-side radio apparatus 200a that is the transmission source. On the other hand, the reception-side radio device 200c transmits a signal SN3 to the transmission-side radio device 200a and the reception-side radio device 200b.

  Here, for example, when the outgoing radio wave (SN3) from the receiving radio 200c is stronger than the outgoing radio wave (SN2) from the receiving radio 200b, the outgoing radio wave (SN2) from the specific destination is the source. May not reach the originating wireless device 200a.

As a method for solving the above problem, for example, Patent Document 1 discloses a technique for avoiding radio wave interference from an interference source during communication. This technique will be specifically described with reference to FIGS.
FIG. 12 is a sequence chart showing a series of processing operations for avoiding radio wave interference from an interference source during communication. Note that the wireless terminal device STA1 belongs to the base station AP1, and the wireless terminal device STA2 belongs to the base station AP2.
As shown in FIG. 12, the wireless terminal device STA1 detects a base station AP2 that is a source of radio wave interference (step S2) with respect to a signal (radio wave) (step S1) transmitted from the base station AP1, and detects the base station AP2. It registers in the interference management table (step S3) and transmits a control signal (interference avoidance message) for avoiding the occurrence of radio wave interference to the base station AP2 (step S4). When receiving the control signal from the wireless terminal device STA2, the base station AP2 performs control for preventing radio wave interference. Specifically, the base station AP2 sets a data transmission prohibition period in itself (step S5), and prohibits data transmission during the set period (step S6). By doing so, the base station AP1 can ensure unicast communication to the wireless terminal device STA1 during the period set by the base station AP2 (step S7).

FIG. 13 is a flowchart illustrating an example of interference avoidance control processing performed in the wireless device 200 according to the related art.
As shown in FIG. 13, the wireless terminal apparatus STA1 determines whether or not the received data (radio wave) is received data from the belonging wireless base station AP1 (step D1), and the received data is transmitted from the base station AP1. If the received data is determined to be received data (step D1 / Yes), the process ends without performing interference avoidance control on the received data.
When it is determined that the received data is not received data from the base station AP1 (step D1 / No), it is determined whether the received data (radio wave) causes radio wave interference with the radio wave of the base station AP1 ( Step D2). If it is determined that radio wave interference will occur (step D2 / Yes), the wireless device that is the interference source (source of received data) is registered in the interference management table (step D3), and an interference avoidance message is sent to the wireless device. To send.
Further, when it is determined that radio wave interference does not occur (step D2 / No), if the transmission source wireless device is registered in the interference management table, information regarding the wireless device is deleted from the table (step D4). ). On the other hand, if the source wireless device is not registered in the interference management table, the interference avoidance control process is terminated as it is.

As described above, when the radio device 200 according to the related art detects the received data (radio wave) and determines that the radio wave causes radio wave interference, the radio device that transmits the radio wave is registered in the interference management table. By doing so, it is possible to transmit an interference avoidance message to the radio device that is the interference source. By doing so, it becomes possible to avoid radio wave interference from the interference source during communication.
JP 2008-17325 A

  However, in the above prior art, since the interference avoidance signal is transmitted after determining that the data (radio wave) received from the surrounding wireless devices is an interference source, for example, after starting communication with a specific transmission destination wireless device, There is a risk of receiving radio waves transmitted from a wireless device that is not determined to be an interference source, resulting in radio wave interference. Also, you must manage the information obtained by detecting the radio waves of the surrounding wireless devices yourself.

  An object of the present invention is to provide a wireless communication system capable of avoiding radio wave interference caused by radio waves transmitted from other radio devices during emergency transmission and receiving a reply with certainty.

  The invention described in claim 1 is made in order to achieve the above object, and includes a first radio that transmits an emergency call signal and a first radio signal that is transmitted from the first radio. When the second radio receives the emergency call signal transmitted by the first radio, the second radio determines whether the emergency call signal is addressed to itself and When it is determined that the transmission signal is not addressed to itself, the transmission operation is prohibited for a predetermined period.

  According to a second aspect of the present invention, in the wireless communication system according to the first aspect, the second wireless device is based on destination information included in the emergency transmission signal transmitted by the first wireless device. It is characterized by determining whether the emergency call signal is addressed to itself.

  According to a third aspect of the present invention, in the wireless communication system according to the first or second aspect, when the second wireless device receives the emergency transmission signal, the second wireless device transmits a reply signal to the emergency transmission signal. The transmission prohibition is canceled when it is determined that the signal received during the transmission prohibition is the reply signal transmitted by the other second wireless device and the reply signal is not addressed to itself. .

  According to a fourth aspect of the present invention, in the wireless communication system according to the third aspect, the second wireless device determines whether the reply signal is addressed to itself based on destination information included in the reply signal. It is characterized by judging.

  According to a fifth aspect of the present invention, in the wireless communication system according to any one of the first to fourth aspects, a transmission prohibition timer that is activated when transmission is prohibited and measures a time until the transmission prohibition period expires. The second wireless device releases the call prohibition when the call prohibition timer expires.

  According to a sixth aspect of the present invention, in the wireless communication system according to any one of the first to fifth aspects, the first wireless device transmits the emergency transmission signal to the specific second wireless device. Then, if there is no reply from the second wireless device even after a predetermined period has elapsed, the emergency call signal is transmitted again.

  ADVANTAGE OF THE INVENTION According to this invention, the radio | wireless communications system which can avoid the radio wave interference from another radio | wireless machine and can receive a reply reliably during emergency transmission can be provided.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is an explanatory diagram showing an example of communication in the wireless communication system according to the present embodiment. The radio devices 100a, 100b, 100c, and 100d are radio devices that use the same frequency. In the present embodiment, the wireless device 100a is a transmission side that transmits an emergency transmission signal (hereinafter referred to as a transmission-side wireless device 100a), and the wireless devices 100b, 100c, and 100d (hereinafter referred to as reception-side wireless devices 100b, 100c, and 100d) are emergency transmissions. A receiving side that receives a signal. Note that the wireless device 100 according to the present embodiment can be either a transmitting-side wireless device or a receiving-side wireless device.
As shown in FIG. 1, the radio devices 100a, 100b, and 100c are within a communicable range N and are in a state where signals can be transmitted and received. On the other hand, the wireless device 100d is outside the communicable range N and cannot transmit / receive signals to / from the wireless devices 100a, 100b, and 100c.
For example, when the transmitting-side radio 100a transmits the signal SN0, the receiving-side radios 100b and 100c can receive the signal SN0, but the receiving-side radio 100d cannot receive the signal SN0.

FIG. 2 is a block diagram illustrating a schematic configuration of the wireless device 100 according to the present embodiment. The radio device 100 according to the present embodiment has no particular structural difference between the transmission side and the reception side.
As shown in FIG. 2, the wireless device 100 includes a communication unit 1, an operation unit 2, a speaker 3, a microphone 4, a data processing unit 5, and a control unit 6.

The communication unit 1 includes a reception unit 11 and a transmission unit 12.
The receiving unit 11 receives radio waves transmitted from other wireless devices via the antenna ANT, performs demodulation processing on the received radio waves, and then outputs a demodulated audio signal or the like to the control unit 6.
The transmitter 12 performs a modulation process or the like on the audio signal output from the controller 6 and then transmits the modulated radio wave via the antenna ANT.

The operation unit 2 includes, for example, a power key, a call key, an emergency call key, and the like.
When a user presses any key of the operation unit 2, an operation signal indicating a request corresponding to the pressed key is output to the control unit 6, and predetermined processing is executed in the control unit 6.

The speaker 3 amplifies an audio signal (for example, an audio signal included in the received radio wave) output from the control unit 6 and outputs audio based on the amplified audio signal.
When the microphone 4 receives a voice input from the user, the microphone 4 converts the input voice into a voice signal and outputs the voice signal to the control unit 6.

  The signal processing unit 5 performs various settings based on the control signal output from the control unit 6. For example, when a transmission prohibition control signal is transmitted by the control unit 6, a transmission prohibition setting is performed and a transmission prohibition timer is started simultaneously. Also, for example, canceling the call prohibition setting, creating a reply signal for the emergency call signal, and the like.

The control unit 6 includes, for example, a CPU (Central Processing Unit) 61, a RAM (Random Access Memory) 62, a ROM (Read Only Memory) 63, and the like, and controls each unit of the wireless device 100.
The RAM 62 develops the processing program executed by the CPU 61 in the program storage area in the RAM 62, and stores the input data and the processing result generated when the processing program is executed in the data storage area.
The ROM 63 is composed of, for example, a semiconductor memory and stores a processing program, data, and the like in advance. The ROM 63 stores, for example, a transmission prohibition setting processing program for controlling not to transmit a signal to a radio device that is in emergency transmission, a transmission prohibition canceling processing program for canceling the transmission prohibition state, and the like.
The CPU 61 reads the processing program and the like stored in the ROM 63, develops it in the RAM 62, and executes it to control the entire radio device 100.
For example, when the CPU 61 accepts pressing of the emergency call key by the user, the CPU 61 causes the caller 1 to send an emergency call signal. Also, for example, when an emergency call signal is received from another wireless device, it is determined whether the emergency call signal is addressed to itself, and if it is not addressed to itself, a process of prohibiting the call operation for a predetermined period is performed. Do.

As described above, the wireless device 100 can avoid radio wave interference from other wireless devices during emergency transmission by the function of the CPU 61.
Hereinafter, a method for the radio device 100 according to the present embodiment to avoid radio wave interference caused by radio waves transmitted from other radio devices at the time of emergency transmission will be described with reference to FIGS.
In FIG. 3, the state of communication at the time of emergency call will be described, and in FIG. 4, a signal transmitted at the time of emergency call will be described. FIG. 5 illustrates a series of processing operations associated with an emergency call, and FIGS. 6 to 8 illustrate various processes (a call prohibition setting process and a call prohibition release process) performed during an emergency call.

FIG. 3 is an explanatory diagram showing an example of communication that is performed when the radio device 100 makes an emergency call.
As shown in FIG. 3, when the transmitting side radio device 100a makes an emergency call of the signal SN1 with the receiving side radio device 100b as a specific destination, the receiving side radio device 100b receives the signal SN1. In addition, the receiving-side radio 100c within the communicable range N receives the signal SN1, but the receiving-side radio 100d outside the communicable range N does not receive the signal SN1.
The receiving-side radio device 100b that has received the signal SN1 returns the signal SN2 to the transmitting-side radio device 100a that is the transmission source. In addition, the receiving-side radio 100c within the communicable range N receives the signal SN2, but the receiving-side radio 100d outside the communicable range N does not receive the signal SN2.

FIG. 4 is an explanatory diagram showing signals transmitted and returned during an emergency call.
As shown in FIG. 4, signal SN1 transmitted at the time of emergency call is composed of an emergency call code, source information, and destination information. On the other hand, the signal SN2 returned at the time of emergency call is composed of an emergency call return code, source information, and destination information.
For example, when the transmitting side radio device 100a makes an emergency call using the receiving side radio device 100b as a specific destination, the signal SN1 includes information on the transmitting side radio device 100a that is the source and the receiving side radio device that is the emergency destination. Information about 100b.

FIG. 5 is a sequence chart showing a series of processing operations performed at the time of emergency call.
As shown in FIG. 5, the transmitting-side radio device 100a makes an emergency transmission of the signal SN1 with the receiving-side radio device 100b as a specific destination (step S11). As shown in FIG. 4, the signal SN1 includes source information (radio device 100a) and destination information (radio device 100b). Further, the signal SN1 is received by the receiving side radio device 100c simultaneously with being received by the receiving side radio device 100b.
The receiving-side radio device 100b is determined to be a specific destination from the destination information included in the received signal SN1 (step S12). On the other hand, the receiving-side radio 100c is determined not to be a specific destination from the destination information included in the received signal SN1, and is set to temporarily prohibit outgoing calls (step S13). The outgoing call prohibition setting process performed here will be described later (see FIG. 6).
After determining that the receiving side radio device 100b is the specific destination, the receiving side radio device 100b returns the signal SN2 to the transmitting side radio device 100a that is the transmission source (step S14). Further, the signal SN2 is received by the receiving side radio device 100c at the same time as being received by the transmitting side radio device 100a.
The receiving-side radio device 100c is determined not to be a specific destination from the destination information included in the received signal SN2, and the outgoing call prohibition setting is canceled (step S15). Note that the outgoing call prohibition release processing performed here will be described later (see FIG. 7).

  FIG. 6 is a flowchart illustrating an example of a transmission prohibition setting process performed in the wireless device 100 according to the present embodiment. This outgoing call prohibition setting process is realized by the CPU 61 executing the outgoing call prohibition setting process program stored in the ROM 63 when the radio apparatus 100 receives a signal from another radio apparatus 100.

As shown in FIG. 6, in step A1, it is determined whether or not an emergency call code is included in the received signal. When the emergency call code is included, the process proceeds to the next step A2, and when the emergency call code is not included, the call prohibition setting process is terminated.
In step A2, it is determined whether or not the destination of the destination information included in the received signal is addressed to itself. If the destination of the destination information is addressed to itself, the process proceeds to step A4. If the destination of the destination information is not addressed to itself, the process proceeds to the next step A3.
In step A3, outgoing call prohibition setting is performed. Specifically, a transmission prohibition control signal is transmitted from the CPU 61 to the signal processing unit 5, and the transmission prohibition setting is performed in the signal processing unit 5. And the transmission prohibition timer which measures the period which performs transmission prohibition is started.
In step A4, a reply is made to the emergency transmission source.

  FIG. 7 is a flowchart illustrating an example of the outgoing call prohibition release process performed in the wireless device 100 according to the present embodiment. This outgoing call prohibition release processing is realized by the CPU 61 executing the outgoing call prohibition release processing program stored in the ROM 63 when the wireless device 100 receives a signal from another wireless device 100.

As shown in FIG. 7, in step B1, it is determined whether or not an emergency call reply code is included in the received signal. If the emergency call reply code is included, the process proceeds to the next step B2, and if the emergency call reply code is not included, the call prohibition release process is terminated.
In step B2, it is determined whether or not the destination of the destination information included in the received signal is addressed to itself. When the destination of the destination information is addressed to itself, the outgoing call prohibition release process is terminated. When the destination of the destination information is not addressed to itself, the process proceeds to the next step B3.
In step B3, it is determined whether or not transmission is currently prohibited. If the outgoing call is currently prohibited, the process proceeds to the next step B4. If the outgoing call is not currently prohibited, the outgoing call prohibition release process is terminated.
In step B4, the transmission prohibition is canceled.
In the present embodiment, in addition to the process, there is a process for automatically canceling the prohibition of transmission when a predetermined period has elapsed after the prohibition of transmission. This outgoing call prohibition automatic cancellation processing will be described with reference to FIG.

  FIG. 8 is a flowchart illustrating an example of a call prohibition automatic release process performed in the wireless device 100 according to the present embodiment. This outgoing call prohibition automatic release processing is realized by the CPU 61 executing the outgoing call prohibition automatic release processing program stored in the ROM 63 when the outgoing call prohibition setting is performed.

As shown in FIG. 8, in step C1, a transmission prohibition timer is started.
In step C2, it is determined whether or not the call prohibition timer has expired. When the transmission prohibition timer has expired, the process proceeds to the next step C3. When the transmission prohibition timer has not expired, the step C2 is repeated.
In step C3, the transmission prohibition is canceled.

As described above, when receiving the emergency call, the wireless device 100 according to the present embodiment temporarily prohibits the transmission of a signal when the specific destination is not addressed to itself. By doing so, it is possible to prevent radio wave interference with radio apparatus 100 that is making an emergency call.
Here, for example, in FIG. 3, when the receiving-side radio 100 d enters the communicable range N after the transmitting-side radio 100 a urgently sends the signal SN1 with the receiving-side radio 100 b as the specific destination, Since the receiving-side radio device 100d has not received the signal SN1, the setting for prohibiting outgoing calls is not made. Accordingly, there is a possibility that the receiving-side radio 100d transmits a signal to the transmitting-side radio 100a before the receiving-side radio 100b returns the signal SN2 to the transmitting-side radio 100a that is the transmission source. is there.
Therefore, when the wireless device 100 according to the present embodiment makes an emergency call, there is a process of making an emergency call again when a preset period has passed before a reply from the specific call destination arrives.
Hereinafter, this process will be described with reference to FIGS. 9 and 10.

FIG. 9 is an explanatory diagram showing an example of communication performed when the radio device 100 makes another emergency call. As shown in FIG. 3, at the time of the first emergency call, the receiving-side radio 100d was outside the communicable range N. However, at the time shown in FIG. It is assumed that the side radio 100d has moved within the communicable range N.
As shown in FIG. 9, the transmitting-side radio 100a makes an emergency call of the signal SN1 with the receiving-side radio 100b as a specific destination, and the receiving-side radio 100b receives the signal SN1. Further, since the receiving-side radio devices 100c and 100d are within the communicable range N, the signal SN1 is received.
The receiving-side radio device 100b that has received the signal SN1 returns the signal SN2 to the transmitting-side radio device 100a that is the transmission source. Further, since the receiving-side radio devices 100c and 100d are within the communicable range N, the signal SN2 is received.

FIG. 10 is a sequence chart showing a series of processing operations performed at the time of emergency call.
As shown in FIG. 10, the transmitting-side radio device 100a makes an emergency transmission of the signal SN1 with the receiving-side radio device 100b as a specific destination (step S21). As shown in FIG. 4, the signal SN1 includes source information (radio device 100a) and destination information (radio device 100b). Further, the signal SN1 is received by the receiving side radio device 100c simultaneously with being received by the receiving side radio device 100b. On the other hand, at this time, the receiving-side radio device 100d is assumed to be outside the communicable range N (see FIG. 3) (step S22).
The receiving-side radio device 100b is determined to be a specific destination from the destination information included in the received signal SN1 (step S23). On the other hand, the receiving-side radio 100c is determined not to be a specific destination from the destination information included in the received signal SN1, and is set to temporarily prohibit transmission (step S24).

Here, it is assumed that the receiving-side radio 100d that was outside the communicable range N when the calling-side radio 100a makes an emergency call enters the communicable range N (see FIG. 9) (step S25). .
Originally, the reception-side radio 100b should return the signal SN2 to the transmission-side radio 100a that is the transmission source after being determined to be the specific transmission destination. Assume that the signal SN2 has not arrived even after a preset period.

If the signal SN2 from the reception-side radio 100b is not returned even after the preset interval, the transmission-side radio 100a re-transmits the signal SN1 (step S26).
The receiving-side radio device 100b is determined to be a specific destination from the destination information included in the received signal SN1 (step S27). On the other hand, the receiving-side radio 100c is determined not to be a specific destination from the destination information included in the received signal SN1, but since the outgoing is already prohibited, no new outgoing prohibition setting is performed (step S28). ). In addition, the receiving-side radio 100d is determined not to be a specific destination from the destination information included in the received signal SN1, and is set to temporarily prohibit transmission (step S29).
After determining that the receiving side radio device 100b is the specific destination, the receiving side radio device 100b returns the signal SN2 to the transmitting side radio device 100a that is the transmission source (step S30). In addition, the signal SN2 is received by the receiving-side radio devices 100c and 100d at the same time as being received by the transmitting-side radio device 100a.
The receiving side radio devices 100c and 100d are determined not to be a specific destination from the destination information included in the received signal SN2, and the outgoing call prohibition setting is canceled (step S31).

In this way, if the processing based on this embodiment is performed, it is possible to determine whether it is an interference source by measuring radio waves related to surrounding wireless devices at the time of emergency transmission, or to manage information on the wireless device that is an interference source. There is no need to do. In addition, it is possible to perform a call prohibition setting for a wireless device that newly enters the communicable range N after an emergency call.
Thereby, it is possible to secure communication between the transmitting-side radio 100a that is a source of emergency transmission and the receiving-side radio 100b that is a specific destination.

  As mentioned above, although concretely demonstrated based on embodiment which concerns on this invention, this invention is not limited to the said embodiment, It can change in the range which does not deviate from the summary.

  For example, in the above embodiment, communication is performed with a maximum of four wireless devices within the communicable range N, but the number of wireless devices is not particularly limited.

It is explanatory drawing shown about an example of communication in the radio | wireless communications system which concerns on this embodiment. It is a block diagram which shows schematic structure of the radio | wireless machine 100 which concerns on this embodiment. 4 is an explanatory diagram showing an example of communication performed when an emergency call is made from the wireless device 100. FIG. It is explanatory drawing shown about the signal transmitted and returned at the time of emergency transmission. It is the sequence chart shown about a series of processing operation performed at the time of emergency transmission. 6 is a flowchart illustrating an example of a transmission prohibition setting process performed in the wireless device 100 according to the present embodiment. 5 is a flowchart illustrating an example of a call prohibition release process performed in the wireless device 100 according to the present embodiment. It is the flowchart shown about an example of the transmission prohibition automatic cancellation | release process performed within the radio | wireless machine 100 which concerns on this embodiment. FIG. 6 is an explanatory diagram showing an example of communication that is performed at the time of another emergency call of the wireless device 100. It is the sequence chart shown about a series of processing operation performed at the time of emergency transmission. It is explanatory drawing shown about an example of the communication at the time of emergency transmission in the radio | wireless communications system which concerns on a prior art. 5 is a sequence chart showing a series of processing operations for avoiding radio wave interference from an interference source during communication. It is the flowchart shown about an example of the interference avoidance control process performed within the radio | wireless machine 200 which concerns on a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Radio | wireless machine 1 Communication part 11 Reception part 12 Transmission part 2 Operation part 3 Speaker 4 Microphone 5 Signal processing part 6 Control part 61 CPU
62 RAM
63 ROM

Claims (6)

  1. In a wireless communication system configured by a first radio that transmits an emergency call signal and a second radio that receives the emergency call signal transmitted by the first radio,
    When the second radio device receives the emergency call signal transmitted from the first radio device, the second radio device determines whether the emergency call signal is addressed to itself, and determines that the emergency call signal is not addressed to itself. A wireless communication system, characterized in that a transmission operation is prohibited for a period of time.
  2.   2. The second wireless device, based on transmission destination information included in the emergency transmission signal transmitted from the first wireless device, determines whether the emergency transmission signal is addressed to the second wireless device. The wireless communication system according to 1.
  3. When the second wireless device receives the emergency call signal, it transmits a reply signal to the emergency call signal,
    The transmission prohibition is canceled when it is determined that the signal received during the transmission prohibition is the reply signal transmitted by the other second wireless device and the reply signal is not addressed to itself. Item 3. The wireless communication system according to Item 1 or 2.
  4.   The wireless communication system according to claim 3, wherein the second wireless device determines whether the reply signal is addressed to itself based on destination information included in the reply signal.
  5. Provided with a call prohibition timer that starts when a call is prohibited and measures the time until the call prohibition period expires.
    The wireless communication system according to any one of claims 1 to 4, wherein the second wireless device releases the transmission prohibition when the transmission prohibition timer expires.
  6.   If the first wireless device does not receive a reply from the second wireless device even after a predetermined period of time has elapsed after transmitting the emergency transmission signal to the specific second wireless device, the emergency transmission is performed again. The radio communication system according to claim 1, wherein a signal is transmitted.
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