JP5099044B2 - Relay device, radio communication system, and radio communication method - Google Patents

Description

  The present invention relates to a relay device, a wireless communication system, and a wireless communication method. More specifically, the present invention relates to a relay control procedure when an arbitrary wireless terminal device communicates with another wireless terminal device via at least one of a plurality of relay devices.

  In recent years, with the dramatic increase in the number of wireless terminal devices, the amount of communication relayed by a relay device such as a repeater has been increasing. For this reason, the repeater relay time becomes longer, the temperature of the internal amplifier circuit, transmitter circuit, etc. rises, leading to the failure of the repeater due to the failure of electronic components such as semiconductor components, and communication between wireless terminal devices via the repeater In some cases, it could not be done. Some proposals have been made regarding relay control procedures when an arbitrary wireless terminal device communicates with another wireless terminal device.

  In the technique disclosed in Patent Document 1, two relays are provided in a relay device, one of which is an active relay and the other is a spare relay, and these two relays are controlled by control of a remote control station. Switch the equipment as a working repeater every fixed time (for example, 30 minutes), and when the transmitter of the working repeater breaks down, stop the switching operation and use the spare repeater continuously It is configured to do. Specifically, the transmitter transmits a signal of frequency f2 to the control station in accordance with the signal of frequency f1 received by the receiver of the active repeater from the remote control station, so that the control station outputs a signal of frequency f2. Is not detected, it is disclosed that the transmitter of the active repeater is detected as having failed.

  In addition, the technology disclosed in Patent Document 2 includes a temperature detection unit that detects an ambient temperature in a fixed wireless terminal device, and the ambient temperature is within a predetermined range when communicating with another fixed wireless terminal device. When a sufficient output for transmitting data cannot be obtained when the value rises above the upper limit or falls below the lower limit, the portable wireless terminal device provided between the fixed wireless terminal device and another fixed wireless terminal device is used. (That is, the portable wireless terminal device functions as a relay device) and data is transmitted. Specifically, the portable wireless terminal device normally intercepts transmission / reception data between fixed wireless terminal devices, and when the relay command is included in the data, the transmission source specified by the relay command The relay operation is performed according to the terminal ID, the destination terminal ID, and the relay terminal ID.

Japanese Patent Publication No.33-4386 JP 07-264114 A

  However, the configuration of Patent Document 1 is only a process after the repeater has failed, and the failure cannot be prevented in advance. For this reason, the communication is completely interrupted for the time until one of the repeaters breaks down and switches to the other repeater, that is, a maximum of 30 minutes. Furthermore, when the transmitter of the active repeater breaks down and the spare repeater is continuously used, the relay time of one active repeater is recovered until the failed repeater is restored. become longer. Therefore, in this one repeater, the temperature of the amplifier circuit, the transmission circuit, etc. rises, leading to the failure of the repeater due to the failure of electronic parts such as semiconductor parts, and until the failed repeater is restored. Communication may be interrupted.

  In Patent Document 2, a portable wireless terminal device is specially provided as a temporary relay device when the ambient temperature of the fixed wireless terminal device deviates from a predetermined range, and the ambient temperature of the fixed wireless terminal device is predetermined. In the case of the range, the portable wireless terminal device has only a function of intercepting transmission / reception data between the fixed wireless terminal devices, so that the system is extremely uneconomical. Further, as described in Patent Document 2, even if a fixed wireless terminal device is provided with a cooling device or a heating device, until the ambient temperature falls within a predetermined range, one portable wireless terminal device The relay time becomes longer. Therefore, in this single portable radio terminal device, the temperature of the amplifier circuit, the transmission circuit, etc. rises, leading to the failure of the portable radio terminal device due to the failure of electronic components such as semiconductor components, and communication may be interrupted. is there.

  The present invention has been made in view of the above circumstances, and in a system in which a wireless terminal device communicates with other wireless terminal devices via a relay device, when relay operations are distributed to a plurality of relay devices, By suppressing an increase in heat generation of the entire relay device, a relay device, a wireless communication system, and a wireless communication system capable of preventing communication from becoming impossible due to a failure of the relay device due to a failure of an electronic component such as a semiconductor component, and An object is to provide a wireless communication method.

In order to achieve the above object, a relay device according to the first aspect of the present invention provides:
It is composed of a plurality of relay devices connected to each other via a communication line and assigned with a unique relay channel, and each relay device relays a wireless terminal device registered to itself to communicate between the wireless terminal devices. In order to select a channel, a relay device constituting a relay system that wirelessly transmits control information constructed based on information acquired from the communication line to the wireless terminal device,
Each relay device
Temperature measuring means for measuring the present internal temperature at substantially constant time intervals and storing the temperature information in a storage area corresponding to the device itself in a predetermined storage means;
Slot determination means for determining whether a time slot circulating in a predetermined order on the communication line is a time slot assigned to the own device or a time slot assigned to another device;
An information writing means for writing the temperature information stored in the storage means by the temperature measuring means into the time slot when the slot determining means determines that the time slot is assigned to the own device;
When the slot determining means determines that the current time slot is a time slot assigned to another device, the temperature information of the storage area corresponding to the other device in the storage means is displayed by the other device. Temperature update means for updating the temperature information written in
When there are two or more relay devices that are available channels that can be used as relay channels in the control information, the relay device corresponding to the lower temperature information is preferentially selected from the storage unit, and the wireless terminal device is selected. Channel notification means for notification,
It is characterized by providing.

  In the relay device according to the first aspect of the present invention, for example, a specific relay device among the plurality of relay devices includes a time measuring means for measuring the substantially constant time interval, and a constant time measured by the time measuring means. Measurement instruction means for instructing another relay apparatus to measure temperature via the communication line at each time interval.

In order to achieve the above object, a wireless communication system according to a second aspect of the present invention includes:
A relay system including a plurality of relay devices connected to each other via a communication line and assigned with a unique relay channel, and a plurality of wireless terminal devices that perform communication via the relay system, Each relay device transmits control information to the wireless terminal device registered with itself, and each wireless terminal device is assigned to each relay device based on the control information received from the relay device with which it is registered. A wireless communication system that performs communication between wireless terminal devices by selecting a channel that is in a relayable state from the received channels,
Each relay device
Temperature measuring means for measuring the present internal temperature at substantially constant time intervals and storing the temperature information in a storage area corresponding to the device itself in a predetermined storage means;
Slot determination means for determining whether a time slot circulating in a predetermined order on the communication line is a time slot assigned to the own device or a time slot assigned to another device;
An information writing means for writing the temperature information stored in the storage means by the temperature measuring means into the time slot when the slot determining means determines that the time slot is assigned to the own device;
When the slot determining means determines that the current time slot is a time slot assigned to another device, the temperature information of the storage area corresponding to the other device in the storage means is displayed by the other device. Temperature update means for updating the temperature information written in
When there are two or more relay devices that are available channels that can be used as relay channels in the control information, the relay device corresponding to the lower temperature information is preferentially selected from the storage unit, and the wireless terminal device is selected. Channel notification means for notification,
With
The wireless terminal device
Connection request means for requesting relay and communicating with another wireless terminal device to the relay device having an empty channel notified by the channel notification means of the relay device in which the own device is registered,
It is characterized by providing.

  In the wireless communication system according to the second aspect of the present invention, for example, a specific relay device among the plurality of relay devices includes a time measuring means for measuring the substantially constant time interval, and a constant time measured by the time measuring means. Measuring instruction means for instructing another relay apparatus to measure temperature via the communication line at each time interval.

In order to achieve the above object, a wireless communication method according to a third aspect of the present invention includes:
A wireless communication method for selecting at least one of a plurality of relay devices connected to each other by a predetermined communication line when a wireless terminal device communicates with another wireless terminal device,
A relay system including a plurality of relay devices connected to each other via a communication line and assigned with a unique relay channel, and a plurality of wireless terminal devices that perform communication via the relay system, Each relay device transmits control information to the wireless terminal device registered with itself, and each wireless terminal device is assigned to each relay device based on the control information received from the relay device with which it is registered. A wireless communication method for selecting at least one relay device in a wireless communication system that performs communication between wireless terminal devices by selecting a channel that is in a relayable state from among the received channels,
Each relay device
Measure the current internal temperature at substantially constant time intervals, store the temperature information in a storage area corresponding to the device itself in a predetermined storage means,
Determining whether a time slot circulating in a predetermined order on the communication line is a time slot assigned to the own device or a time slot assigned to another device;
When it is determined that the time slot is a time slot assigned to the own device, the temperature information stored in the storage means is written to the time slot,
When it is determined that the time slot is a time slot assigned to another device, the temperature information of the storage area corresponding to the other device in the storage means is written to the time slot by the other device. Updated to
When there are two or more relay devices that are available channels that can be used as relay channels in the control information, the relay device corresponding to the lower temperature information is preferentially selected from the storage unit, and the wireless terminal device is selected. Notify
The wireless terminal device
For a relay device having a vacant channel notified by the relay device with which the device is registered, request relaying and communicate with other wireless terminal devices.
It is characterized by that.

  In the wireless communication method according to the third aspect of the present invention, for example, a specific relay device among the plurality of relay devices clocks the substantially constant time interval, and repeats another relay at every time interval that is timed. A temperature measurement is instructed to the apparatus via the communication line.

  According to the present invention, each of a plurality of relay devices measures the current temperature inside at substantially constant time intervals, and a wireless terminal device registered in the own device makes a call with another wireless terminal device. If there are two or more relay devices that are available as relay channels to be inserted into the control information for selecting a relay channel, the relay device corresponding to the lower temperature information is preferentially selected. The relay channel information assigned to the relay device is written to generate control information and transmitted to the wireless terminal device registered in itself. As a result, when the relay operation is distributed to a plurality of relay devices, a relay device with a high measured temperature is avoided, and a relay device with a low measured temperature is preferentially selected and relayed, thereby allowing the semiconductor component It is possible to prevent electronic components from malfunctioning. In addition, it is possible to prevent a decrease in transmission power accompanying a temperature increase of the relay device.

  In addition, according to the present invention, it is possible to reduce the radiator by suppressing the temperature rise of each relay device, and it is possible to reduce the size and weight of the relay device and reduce the cost.

It is a block diagram of the radio | wireless communications system in embodiment of this invention. It is a block diagram which shows the structure of the radio | wireless terminal apparatus of FIG. It is a block diagram which shows the structure of the repeater of FIG. FIG. 2 is a diagram including a synchronization signal sent to the communication line of FIG. 1 and time slots assigned to each repeater following the synchronization signal. It is a figure of the format of the communication frame transmitted / received between the radio | wireless terminal apparatus of FIG. 1, and a repeater. It is a flowchart of CPU of FIG. 3 which shows operation | movement of each repeater. It is a figure which shows the temperature information table of RAM of the repeater of FIG.

  Hereinafter, embodiments of a relay device, a wireless communication system, and a wireless communication method according to the present invention will be described with reference to the drawings.

  FIG. 1 is a configuration diagram of a site 10 of a wireless communication system according to an embodiment of the present invention. In FIG. 1, a site 10 is one communication area. A repeater system 30 is installed at the site 10. The repeater system 30 is one relay system, and is configured by a plurality of (for example, a maximum of 30) repeaters 1 to n connected via a communication line 5b that is a system bus. Each of the repeaters 1 to n is assigned a unique relay channel. The plurality of repeaters 1 to n cooperate with each other to perform a call relay process between the wireless terminal devices existing in the site 10 which is the same communication area. In the site 10, a repeater system 30 composed of a plurality of repeaters 1 to n is connected to the server 4 via a communication line 5a such as an IP connection line. Of the communication lines 5a and 5b, the communication line 5b is referred to as a “system bus”. Therefore, in the following description, the communication line 5b is called a system bus.

  The server 4 can perform various settings of the plurality of repeaters 1 to n by remote operation. Each repeater is composed of a repeater unit and a controller unit. Information of each repeater is exchanged via the system bus and shared with each other. Timing of transmitting data to another repeater, since either send data in advance which time slot is set, and sends the data to the set time slot.

  One of the plurality of repeaters is set as a “master repeater”. In FIG. 1, the repeater 1 is a master repeater. The master repeater 1 sends a synchronization signal for synchronizing the repeaters 2 to n including its own device to the system bus.

  The wireless terminal devices A to H have one of the repeaters 1 to n registered as a home repeater, and in the standby state, the channel frequency of the home repeater is set, and the home repeater downlink A signal is being received. The wireless terminal devices A to H acquire empty channel information inserted in the downlink signal of the home repeater, move the channel frequency to this empty channel, and perform a call with other wireless terminal devices. When the call ends, the channel frequency is returned to the home repeater channel frequency and the standby state is restored. In FIG. 1, wireless terminal apparatuses A to D use a repeater 1 as a home repeater, wireless terminal apparatuses E and F use a repeater 2 as a home repeater, and wireless terminal apparatuses G and H use a repeater 3 as a home repeater.

  The wireless communication system of FIG. 1 is a trunking system in which a wireless terminal device shares a plurality of repeaters 1 to n and appropriately selects at least one repeater from among them. In this trunking system, none of the plurality of repeaters 1 to n is a dedicated control channel, and any repeater is appropriately a control channel and also a call channel. A call system in this system will be specifically described with reference to the example of FIG. In the example of FIG. 1, the wireless terminal devices A to D are registered in the repeater 1 that is the same home repeater. Here, it is assumed that the wireless terminal device A makes a call with the wireless terminal devices B to D. In this case, prior to the call, the wireless terminal device A transmits a call permission request to the call channel that can be called, for example, the repeater 2 included in the downlink signal from the repeater 1. Then, the wireless terminal device A receives a response from the repeater 2 to permit the call. As a result, a call link is established between the wireless terminal apparatuses A to D via the repeater 2. On the other hand, the wireless terminal apparatuses B to D receive a control signal from the repeater 1 to move to a call channel with which a link has been established, for example, the repeater 2. And these radio | wireless terminal apparatuses B-D move a channel frequency, and perform a telephone call with the radio | wireless terminal apparatus A via the call channel, for example, repeater 2. FIG. Thus, the repeater 1 becomes a control channel in the above case for the wireless terminal apparatuses A to D. On the other hand, the repeater 1 is not a control channel for the other radio terminal apparatuses E to H. However, it can be a communication channel for these terminal devices. Here, the call between the wireless terminal devices A to D is a group call in the wireless terminal devices A to D as a whole, or a small group composed of, for example, the wireless terminal devices A and B by subdividing the group unit. Group calls or individual calls (referred to as “Individual Call”) for one wireless terminal device.

  At this time, the repeater 1 is connected to the repeaters 2 to n by the system bus as described above and shares information of each repeater via the system bus, so that it knows which repeater is an empty channel. . The wireless terminal device A performs a call by setting the transmission frequency to the frequency of the call channel acquired from the empty channel information in the downlink communication frame from the repeater 1 which is its home repeater. In this embodiment, it is assumed that one unique channel is assigned to one repeater.

  Next, functions of each wireless terminal device and each repeater will be described. FIG. 2 is a block diagram illustrating the configuration of the wireless terminal apparatuses A to H of FIG. FIG. 3 is a block diagram showing a configuration of repeaters 1 to n in FIG. FIG. 4 is a diagram including a synchronization signal sent from the master repeater 1 to the system bus and a time slot assigned to each repeater following the synchronization signal. FIG. 5 is a diagram illustrating a format of a communication frame transmitted and received between the repeater and the wireless terminal device. The communication frame is composed of a header part and a data part. Detailed contents of the header part and the data part will be described later.

  As shown in FIG. 2, the radio terminal apparatuses A to H include an antenna ANTSR, a transmission / reception switching unit 11, a transmission unit 12, a baseband processing unit 13, an A / D conversion unit 14, a microphone 15, and a reception block. Unit 16, baseband processing unit 17, D / A conversion unit 18, and speaker 19. In addition, the wireless terminal devices A to H include a controller 20, a timer unit 25, a display unit 26, and an operation unit 27 as control system blocks. Further, the controller 20 includes a CPU (central processing unit) 21, an I / O (input / output unit) 22, a RAM (read / write memory) 23, a ROM (read only memory) 24, and an internal bus (see FIG. Not shown).

  In the wireless terminal devices A to H of FIG. 2, signal system blocks are controlled by a control system CPU 21. The CPU 21 executes a control program stored in the ROM 24 to control the entire wireless terminal device, and is obtained from commands and data input from the operation unit 27 via the I / O 22 and the baseband processing unit 17. Data is processed and temporarily stored in the RAM 23, and the stored commands and data are displayed on a display unit 26 such as an LCD (Liquid Crystal Display) as necessary. Further, the CPU 21 displays the current time obtained from the time measuring unit 25 on the display unit 26. Although not shown in the figure, a rewritable nonvolatile memory card such as a flash ROM in which an ID that is unique identification information of the wireless terminal device is recorded may be detachably incorporated.

  Next, a general operation of the signal system block will be described. The transmission / reception switching unit 11 is connected to the antenna ANTSR on the input side, and alternatively connected to the transmission unit 12 or the reception unit 16 on the output side according to the control of the CPU 21. When the operation operation is not performed by the operation unit 27, the output side of the transmission / reception switching unit 11 is connected to the reception unit 16 and is in a reception (standby) mode, but when a call operation is performed by the operation unit 27 The output side of the transmission / reception switching unit 11 is connected to the transmission unit 12 and switches to the transmission mode.

  When the wireless terminal devices A to H are in the transmission mode, the microphone 15 outputs an analog audio signal to the A / D converter 14 in response to the user's audio input.

  The A / D conversion unit 14 converts the audio signal from the microphone 15 from analog to digital and outputs it to the baseband processing unit 13.

  The baseband processing unit 13 generates a communication frame of a predetermined format based on the data of the audio signal from the A / D conversion unit 14 or based on the data stored in the RAM 23 of the controller 20, and transmits the transmission frame. 12 is output.

  The transmission unit 12 modulates the communication frame from the baseband processing unit 13 and transmits the modulated communication frame to the repeater during the relay operation via the transmission / reception switching unit 11 and the antenna ANTSR. As a modulation method of the transmission unit 12, GMSK (Gaussian filtered Minimum Shift Keying), PSK (Phase Shift Keying), QAM (Quadrature Amplitude Modulation), FSK (Frequency Shift Keying), or the like is used.

  When the wireless terminal devices A to H are in the reception mode, when the wireless signal is received from the repeater, the transmission / reception switching unit 11 outputs the received signal input via the antenna ANTSR to the receiving unit 16.

  The receiving unit 16 amplifies the reception signal output from the transmission / reception switching unit 11, performs signal processing such as demodulation processing, and outputs the demodulated signal to the baseband processing unit 17.

  The baseband processing unit 17 extracts a communication frame from the demodulated signal output from the receiving unit 16. Further, the information of the header part H of the extracted communication frame is output to the CPU 21. The CPU 21 analyzes the information of the header part H, and when the transmission destination of the received signal is its own station, the CPU 21 outputs the audio signal data included in the data part D to the D / A converter 18. The data other than the audio signal included in the data part is temporarily stored in the RAM 23 and displayed on the display part 26 as necessary.

  The D / A converter 18 converts the audio signal from the baseband processor 17 from digital to analog and causes the speaker 19 to generate a sound.

  The repeaters 1 to n in FIG. 3 include, as signal blocks, a transmission-only antenna ANTS, a transmission unit 32, a baseband processing unit 33, a reception-specific antenna ANTR, a reception unit 36, a baseband processing unit 37, and an input unit 6. , An output unit 7 and a network I / F (interface) 8. Each repeater includes a controller 40, a time measuring unit 45, a temperature measuring unit 48, a display unit 46, and an operating unit 47 as control system blocks. The controller 40 further includes a CPU (central processing unit) 41, an I / O (input / output unit) 42, a RAM (read / write memory) 43, a ROM (read only memory) 44, and an internal bus (see FIG. Not shown). Each of the repeaters 1 to n includes a bus I / F (interface) 9 for transmitting information of the own device to a system bus described later and acquiring information from other repeaters.

  Although not shown in the drawing, the temperature measurement unit 48 includes a temperature sensor such as a thermistor and an A / D conversion unit. The CPU 41 takes in the current temperature data measured by the temperature measurement unit 48 and stores it in the RAM 43 in accordance with a command input from the master repeater 1 at regular intervals of about 20 minutes to 30 minutes. That is, the temperature data in the RAM 43 is updated at regular intervals. Therefore, the timer functions of the slave repeaters 2 to n are set off, and the load on the CPU 41 of the slave repeaters 2 to n is reduced. As a modification of the embodiment, a configuration in which each of the repeaters 1 to n measures the temperature every certain time may be employed.

  The repeaters 1 to n (for example, the repeater 1) perform signal processing such as amplification processing and waveform processing on the wireless signal received from the transmission-source wireless terminal device (for example, the wireless terminal device A), and the transmission destination wireless terminal Since the data is transmitted to a device (for example, the wireless terminal device B), the wireless communication device basically has the same configuration as the wireless terminal devices A to H shown in FIG. Therefore, the components that are basically the same as the components of the wireless terminal devices A to H shown in FIG. .

  When wireless terminal devices communicate with each other via a repeater, the transmission uplink from the wireless terminal device to the repeater and the downlink transmission from the repeater to the wireless terminal device change the frequency or time slot. Communicate at the same time. Therefore, as described above, the repeater includes the antenna ANTS dedicated to transmission and the antenna ANTR dedicated to reception. Each of the plurality of repeaters is connected to each other via a system bus (communication line 5b) and connected to the server 4 via a communication line 5a such as an IP connection line as shown in FIG. . The input unit 6 receives control data from the server 4 via the network I / F 8 under the input control of the CPU 41, and the output unit 7 is requested by the server 4 via the network I / F 8 under the output control of the CPU 41. Output data. Furthermore, when constructing a multi-site network that communicates with other sites 10 constituting another communication area, communication frames are transmitted / received to / from the repeaters 1 to n of the other sites 10 via the network I / F 8. . The bus I / F 9 is controlled by the input control of the CPU 41, the synchronization signal sent to the system bus by the master repeater 1, the repeater information sent from the repeater other than the own device to the system bus, and the output control of the CPU 41. It mediates the sending of its own information to the system bus.

  Next, a control procedure that is a feature of the present invention will be described with reference to FIGS. One period of the time slot allocated to each repeater following the synchronization signal and the synchronization signal transmitted from the master repeater 1 shown in FIG. 4 is 80 ms, and the first 40 ms is 32 slots from SLOT 0 to SLOT 31. It consists of Therefore, each slot has a time length of 1.25 ms. The first SLOT0 is a synchronization signal, which is transmitted by one specific repeater, that is, the master repeater 1, according to a predetermined algorithm, and the other repeaters 2 to n automatically become slave repeaters to acquire this synchronization signal. . The repeaters 1 to n, that is, the repeater system 30 are operating in synchronization with this synchronization signal. Any one of SLOT 1 to 31 other than the synchronization SLOT 0 is assigned to the repeaters 1 to n, and information of each repeater shared between the repeaters 1 to n is written to the SLOT assigned to the own apparatus. The repeater 1, which is a master repeater, sends a synchronization signal to SLOT0, and writes the information of the repeater 1 to the SLOT assigned to the repeater 1 out of SLOT1 to SLOT31. The last SLOT 31 is used for connecting an external device for a future extension function.

  FIG. 5A shows an example of a communication frame format when establishing a link with a call channel, and FIG. 5B shows an example of a communication frame format when voice and data are communicated. The format of the communication frame transmitted and received between the home repeater and the wireless terminal device shown in FIG. 5B is also 80 ms, and is composed of 384 bits. In FIG. 5, P is a preamble (only at initial transmission), FSW is a frame synchronization word, LICH is link information, SCCH is signaling control, FACCH is high-speed accompanying control, and G is data of guard time.

  In FIG. 1, when the wireless terminal device B acquires empty channel information included in the downlink signal from the repeater 1 which is a home repeater, and makes an individual call to the wireless terminal device A via the repeater 2 which is an empty channel. First, in the SCCH in the communication frame format at the time of link establishment shown in FIG. 5A, the ID of the repeater 2 that is the communication channel to be used, and the home repeater in which the wireless terminal device A that is the called terminal is registered. Write the ID of a certain repeater 1 and the like on the FACCH, the ID of the repeater 1 that is the home repeater to which the wireless terminal device B that is the calling terminal is registered, the ID of the wireless terminal device B that is the calling terminal, It transmits to the repeater 2 which is a call channel.

  In response to this, the response of the repeater 2 turns back the communication frame transmitted from the wireless terminal device B, and empty channel information is written here. After receiving the call-permitted communication frame from the repeater 2, the wireless terminal device B receives the home repeater or wireless terminal device B in which the wireless terminal device B is registered in the SCCH of the communication frame format shown in FIG. Next, the voice ID is inserted in the case of voice communication, the data is inserted in the case of data communication, and transmitted to the repeater 2.

  Each repeater acquires information included in a communication frame transmitted from the wireless terminal device, and sends information to the SLOT assigned to the own device including other information indicating the state of the repeater. Those pieces of information are shared among the repeaters constituting 10. Therefore, since the repeater 1 in which the wireless terminal device A that is the called terminal is registered can grasp that the wireless terminal device B is making an individual call to the wireless terminal device A via the repeater 2, An instruction to move to the channel frequency of the repeater 2 is inserted into the wireless terminal device A in the communication frame of the downlink signal.

  In the standby state, since the wireless terminal device receives the channel frequency of the downlink signal of the registered home repeater, it can move the channel frequency to the call channel that is being called. When a group call is requested, the group ID may be written in the wireless terminal device A instead of the ID.

  FIG. 6 is a flowchart of the CPU 41 of FIG. 3 showing the operation of each repeater. FIG. 7 is a temperature information table (storage area) showing the current temperature information of each repeater stored in the RAM 43 of the repeater 1. In the case of FIG. 1, the temperature information of the three repeaters 1, 2, 3 which are empty channels is stored, but the temperature information of up to 30 repeaters can be stored.

  In FIG. 6, the repeater determines whether or not the temperature measurement time has come (step S201). When the temperature measurement time comes, the current temperature is measured by the temperature measurement unit 48 (step S202), and the previous temperature information stored in the temperature information table corresponding to the own device in the RAM 43 is updated (step S203). ).

  Next, the system bus is monitored to determine whether or not it is the time slot timing of its own device (step S204). At the time slot timing of the own device, the temperature information stored in the temperature information table corresponding to the own device in the RAM 43 is sent to the time slot (step S205).

  On the other hand, if it is not the time slot timing of the own apparatus, that is, the time slot timing of another repeater, it is determined whether there is temperature information from another repeater (step S208).

After the temperature information is sent in step S205, or if there is temperature information from another repeater in step S208, the temperature information in the temperature information table corresponding to the other repeater in the RAM 43 is updated (step S206).
If it is determined in step S208 that there is no temperature information from another repeater, the process returns to step S204.

  After updating the temperature information table in step S206, or if it is not the temperature measurement time in step S201, other processing is performed (step S207), and it is determined whether or not the temperature measurement time is reached in step S201.

  Free communication channel information is included in the downlink communication frames of the repeaters 1 to n, and the wireless terminal apparatuses A to H receive the downlink of the home repeater registered in advance in the standby state. The wireless terminal devices A to H acquire vacant channel information included in a downlink communication frame from the home repeater, and communicate with other wireless communication terminals using the acquired channel. The repeaters 1 to n select a repeater having the lowest temperature from the repeaters 1 to n that are empty channels stored in the RAM 43, and use them as empty channel information in the communication frame. Accordingly, the wireless terminal devices A to H acquire the empty channel information included in the downlink communication frame from the home repeater, and make a call in accordance with the frequency of the repeater channel that is an empty channel, so that the other wireless devices Make a call with the terminal device.

  As described above, in the above-described embodiment, each repeater 1 to n measures the current temperature inside at substantially constant time intervals, and stores the temperature information in the temperature information table corresponding to its own device in the RAM 43. When the current time slot is a time slot assigned to the own device or a time slot assigned to another device, and the current time slot is a time slot assigned to the own device Writes the temperature information of the temperature information table corresponding to its own device in the RAM 43 into the current time slot. On the other hand, when the current time slot is a time slot assigned to another device, each repeater 1 to n corresponds to the other device in the RAM 43 by the temperature information written in the current time slot by the other device. Update the temperature information in the temperature information table.

  The home repeater 1 is lower when there are two or more repeaters that are vacant channels when the wireless terminal device registered in its own device designates a channel for communicating with other wireless terminal devices. A repeater corresponding to the temperature information is preferentially selected from the temperature information table in the RAM 43. For example, in FIG. 1, when the home repeater 1 in which the wireless terminal device B is registered generates the downlink communication frame, there are two repeaters that are empty channels, the repeaters 2 and 3, so the temperature of FIG. The repeater 3 having the lowest temperature is preferentially selected from the information table and used as empty channel information in the communication frame. When the wireless terminal device B communicates with another wireless terminal device A, the vacant channel information in the communication frame from the home repeater 1 (in this case, the repeater 3 having the lowest temperature) is acquired, and the call channel And

  As a result, when the relay operation is distributed to a plurality of repeaters 1 to n, a repeater with a high temperature is avoided, a repeater with a lower temperature is preferentially selected and relayed, and a temperature increase of the repeaters 1 to n is suppressed. can do. Therefore, failure of electronic components such as semiconductor components due to temperature rise can be prevented, and failure of repeaters 1 to n can be prevented. In particular, as in the present embodiment, any one of a plurality of repeaters 1 to n is a master repeater, and the repeaters 1 to n cooperate with each other in a wireless communication device existing in the site 10 that is the same communication area. In the case of a wireless communication system that is responsible for relaying the call, if the master repeater fails, the wireless communication system itself becomes unusable. Therefore, it is possible to improve the stability of the wireless communication system by preventing the repeater from being broken. Furthermore, it is possible to reduce the size of the radiator, and it is possible to reduce the size and weight of the repeaters 1 to n and reduce the cost. In addition, it is possible to prevent a decrease in transmission power accompanying a temperature increase of the relay device.

  Further, according to the above-described embodiment, the master repeater 1 measures a substantially constant time interval, and performs temperature measurement via the system bus with respect to the other repeaters 2 to n at each fixed time interval. Instruct.

  Thereby, the other repeaters 2 to n according to the master repeater 1, i.e., the slave repeater, can easily recognize the timing of measuring the current temperature of the own apparatus according to the instruction from the master repeater 1.

  The above embodiments are for explaining the present invention, and the present invention is not limited to the above embodiments, and other embodiments and other embodiments that can be considered by those skilled in the art without departing from the scope of the claims. Modifications also belong to the present invention.

  For example, in the above embodiment, the relay device corresponds to repeaters 1 to n that perform a relay operation in the physical layer of the OSI reference model, that is, layer 1. Further, the temperature measuring means, slot discriminating means, information writing means, temperature updating means, channel notification means, and measurement instruction means correspond to the functions of the CPU 41 of the repeaters 1 to n, the storage means corresponds to the RAM 43, and the time measuring means. Corresponds to the timer 45. The connection request means corresponds to the function of the CPU 21 of the wireless terminal device 1.

  Moreover, in the said embodiment, the master repeater 1 instruct | indicated the timing which measures the present temperature of an own apparatus to the other repeaters 2-n which are slave repeaters. However, each of the repeaters 2 to n may have a timer, and each of the repeaters 2 to n may measure the temperature measurement timing using this timer without depending on an instruction from the master repeater 1.

A to H wireless terminal device 1 to n repeater 5 communication line 20, 40 controller 21, 41 CPU
23, 43 RAM

Claims (6)

It is composed of a plurality of relay devices connected to each other via a communication line and assigned with a unique relay channel, and each relay device relays a wireless terminal device registered to itself to communicate between the wireless terminal devices. In order to select a channel, a relay device constituting a relay system that wirelessly transmits control information constructed based on information acquired from the communication line to the wireless terminal device,
Each relay device
Temperature measuring means for measuring the present internal temperature at substantially constant time intervals and storing the temperature information in a storage area corresponding to the device itself in a predetermined storage means;
Slot determination means for determining whether a time slot circulating in a predetermined order on the communication line is a time slot assigned to the own device or a time slot assigned to another device;
An information writing means for writing the temperature information stored in the storage means by the temperature measuring means into the time slot when the slot determining means determines that the time slot is assigned to the own device;
When the slot determining means determines that the current time slot is a time slot assigned to another device, the temperature information of the storage area corresponding to the other device in the storage means is displayed by the other device. Temperature update means for updating the temperature information written in
When there are two or more relay devices that are available channels that can be used as relay channels in the control information, the relay device corresponding to the lower temperature information is preferentially selected from the storage unit, and the wireless terminal device is selected. Channel notification means for notification,
A relay device comprising:   A specific relay device among the plurality of relay devices includes a time measuring unit that measures the substantially constant time interval, and the communication line is connected to another relay device at a certain time interval timed by the time measuring unit. The relay apparatus according to claim 1, further comprising: a measurement instruction unit that instructs temperature measurement via the relay unit. A relay system including a plurality of relay devices connected to each other via a communication line and assigned with a unique relay channel, and a plurality of wireless terminal devices that perform communication via the relay system, Each relay device transmits control information to the wireless terminal device registered with itself, and each wireless terminal device is assigned to each relay device based on the control information received from the relay device with which it is registered. A wireless communication system that performs communication between wireless terminal devices by selecting a channel that is in a relayable state from the received channels,
Each relay device
Temperature measuring means for measuring the present internal temperature at substantially constant time intervals and storing the temperature information in a storage area corresponding to the device itself in a predetermined storage means;
Slot determination means for determining whether a time slot circulating in a predetermined order on the communication line is a time slot assigned to the own device or a time slot assigned to another device;
An information writing means for writing the temperature information stored in the storage means by the temperature measuring means into the time slot when the slot determining means determines that the time slot is assigned to the own device;
When the slot determining means determines that the current time slot is a time slot assigned to another device, the temperature information of the storage area corresponding to the other device in the storage means is displayed by the other device. Temperature update means for updating the temperature information written in
When there are two or more relay devices that are available channels that can be used as relay channels in the control information, the relay device corresponding to the lower temperature information is preferentially selected from the storage unit, and the wireless terminal device is selected. Channel notification means for notification,
With
The wireless terminal device
Connection request means for requesting relay and communicating with another wireless terminal device to the relay device having an empty channel notified by the channel notification means of the relay device in which the own device is registered,
A wireless communication system comprising:   A specific relay device among the plurality of relay devices includes a time measuring unit that measures the substantially constant time interval, and the communication line is connected to another relay device at a certain time interval timed by the time measuring unit. The wireless communication system according to claim 3, further comprising a measurement instruction unit that instructs temperature measurement via the wireless communication system. A wireless communication method for selecting at least one of a plurality of relay devices connected to each other by a predetermined communication line when a wireless terminal device communicates with another wireless terminal device,
A relay system including a plurality of relay devices connected to each other via a communication line and assigned with a unique relay channel, and a plurality of wireless terminal devices that perform communication via the relay system, Each relay device transmits control information to the wireless terminal device registered with itself, and each wireless terminal device is assigned to each relay device based on the control information received from the relay device with which it is registered. A wireless communication method for selecting at least one relay device in a wireless communication system that performs communication between wireless terminal devices by selecting a channel that is in a relayable state from among the received channels,
Each relay device
Measure the current internal temperature at substantially constant time intervals, store the temperature information in a storage area corresponding to the device itself in a predetermined storage means,
Determining whether a time slot circulating in a predetermined order on the communication line is a time slot assigned to the own device or a time slot assigned to another device;
When it is determined that the time slot is a time slot assigned to the own device, the temperature information stored in the storage means is written to the time slot,
When it is determined that the time slot is a time slot assigned to another device, the temperature information of the storage area corresponding to the other device in the storage means is written to the time slot by the other device. Updated to
When there are two or more relay devices that are available channels that can be used as relay channels in the control information, the relay device corresponding to the lower temperature information is preferentially selected from the storage unit, and the wireless terminal device is selected. Notify
The wireless terminal device
For a relay device having a vacant channel notified by the relay device with which the device is registered, request relaying and communicate with other wireless terminal devices.
A wireless communication method.   A specific relay device among the plurality of relay devices clocks the substantially constant time interval, and instructs other relay devices to measure temperature via the communication line at each time interval. The wireless communication method according to claim 5.

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