JP4876933B2 - Wireless communication system, control method therefor, and server - Google Patents

Description

  The present invention relates to a wireless communication system, a control method thereof, and a server. More specifically, the present invention relates to selection of a repeater with which a wireless communication device communicates in a wireless communication system in which wireless communication devices communicate with each other via a repeater.

  Wireless communication includes a method of performing communication between wireless communication devices via a so-called repeater. The wireless communication devices communicate with each other by changing the frequency or the time slot between the uplink of transmission from the wireless communication device to the repeater and the downlink of transmission from the repeater to the wireless communication device at the same time.

  A plurality of repeaters are connected by a network to form a single wireless communication system, and a communication area of the wireless communication system can be configured from a cover area of the plurality of repeaters. In that case, communication channels (uplink and downlink frequencies) are usually determined for each repeater. The wireless communication apparatus selects a repeater channel in the repeater area where the station stays. That is, a call is awaited at the downlink frequency of the repeater, and another wireless communication device is called at the uplink frequency of the repeater.

  When a wireless communication device that performs communication via a repeater calls another wireless communication device, it designates the repeater to which the wireless communication device that is the communication partner belongs (stays in that repeater area), A call activation signal is transmitted on the channel to the repeater to which the own station belongs.

  When there are a plurality of repeaters of the same channel in a range where radio waves of one wireless communication device can reach, a problem of contention between the plurality of repeaters occurs. For example, Patent Document 1 discloses a technique for preventing unnecessary transmission to a base station by controlling a start time of a relay station to prevent occurrence of beat interference and S / N deterioration in the base station. Is described.

  In the technology of Patent Document 1, in a wireless relay system that relays communication via two or more relay stations when performing communication between a mobile station and a base station, the mobile station is connected to a relay device installed in the relay station. The operation start time of the transmitter is controlled according to the magnitude of the received electric field. A receiver for detecting a signal for transmitting the communication from the adjacent relay station to the base station is provided, and when the transmitter receives the signal from the adjacent relay station before the operation starts, Stop operation start.

Also, in Patent Document 2, even if one of the transmitters of a plurality of subordinate transmission stations emits wrong information or a signal lacking information, not only the service area of the own station but also adjacent and overlapping. A technique for avoiding interference to the service area of a transmitting station is described. The technique of Patent Document 2 includes a parent transmission station and a plurality of subordinate transmission stations. In a unidirectional communication system in which a plurality of subordinate transmission stations transmit radio waves all at once, each subordinate transmission station can receive a relay signal. And receiving signal determining means for controlling the activation of the subordinate transmitter based on the determination result.
JP-A-57-141146 JP-A-63-132535

  FIG. 12 shows a communication procedure when two repeaters receive radio waves from the same wireless communication device (slave unit) in a conventional wireless communication system. The same channel (frequency) is set for the two repeaters 2A and 2B. In FIG. 12, the outgoing radio wave of the handset 3A is received by two repeaters 2A and 2B. Each of the two repeaters 2A and 2B transmits the location registration and inquiry packet of the slave unit 3A to the server S. The server S transmits a location registration ACK (acknowledgment) and a destination inquiry response to the two repeaters 2A and 2B, respectively. The two repeaters 2A and 2B that have received the response respectively transmit data having the same contents to the destination repeater 2C (steps E1 and E2, and steps E5 and E6). The receiving side repeater 2C receives the same data from the two repeaters 2A and 2B, and transmits the data to the slave unit 3D (steps E3 and E4, steps E7 and E8).

  In a situation where multiple repeaters are installed in a wireless communication system, if the repeaters have the same frequency (channel), the multiple repeaters simultaneously receive transmission radio waves from the wireless communication device (child device), and then perform relay communication. Do. Here, when each repeater is connected by wire, the same audio data is transmitted from the plurality of repeaters to the same incoming repeater through the wire. Since the repeater on the receiving side receives the voice redundantly, as a result, the voice of the receiving side slave unit becomes abnormal. For example, the transmission sound “Aiueo” of the slave unit is duplicated on the receiving side like “Oh no Ueio”.

  If there are repeaters of the same channel among the plurality of repeaters, the same voice is multiplexed and transmitted by receiving those radio waves simultaneously. If all the repeater channels are set differently, this phenomenon does not occur, but instead, intermodulation due to the use of multiple channels may occur. Further, since the number of repeater channels is limited (for example, all 27 channels in the specific low-power radio), it is impossible to use more repeaters at the same time.

  The present invention has been made to solve the above-described problems. When a plurality of repeaters receive radio waves from a wireless communication device at the same time, the repeaters to be communicated are automatically selected to perform normal communication. An object is to provide a wireless communication system.

In order to achieve the above object, a wireless communication system according to a first aspect of the present invention includes:
A wireless communication system including a plurality of repeaters connected via a network and a wireless communication device that performs communication via the repeaters,
The repeater includes means for transmitting an inquiry packet for inquiring a repeater to which a destination wireless communication device belongs when receiving a call from the wireless communication device;
The inquiry packet includes a source ID which is information for identifying the calling wireless communication device,
A time measuring means for measuring a time until a predetermined first time elapses when the first inquiry packet is received;
Response means for transmitting a response to the first inquiry packet;
With
The response means responds to the second inquiry packet when receiving the second inquiry packet having the same source ID as the first inquiry packet while the first time elapses. Is not transmitted.

Preferably, the repeater includes a position registration unit that transmits a position registration packet indicating that the wireless communication device exists in a communication range of the repeater,
When a location registration packet having the same source ID as that of the first inquiry packet is received while the first time has elapsed, a negative response means is provided for transmitting a negative response to the location registration packet. .

And a holding means for holding the response until a predetermined second time has elapsed when the first location registration packet is received;
Acknowledgment means for transmitting an affirmative response to the first location registration packet when a packet having the same source ID as the first location registration packet is not received during the elapse of the second time. When,
With
When the negative response means receives a second location registration packet having the same source ID as the first location registration packet while the second time elapses, the second location registration packet Send a negative response to
When the acknowledgment means does not receive an inquiry packet having the same source ID as the first location registration packet while the second time elapses, the acknowledgment means responds to the first location registration packet. Send an acknowledgment,
When an inquiry packet having the same source ID as the first location registration packet is received while the second time elapses,
The response means transmits a response only to the first inquiry packet having the same source ID as the first location registration packet received during the elapse of the second time,
The negative response means transmits a negative response to the first location registration packet;
You may comprise.

  Preferably, the response means receives the inquiry packet having the same source ID as the location registration packet within a predetermined time from a repeater that has transmitted an acknowledgment to the location registration packet. A response is transmitted to the inquiry packet without waiting for the time 1 to elapse.

  Preferably, the repeater does not transmit a packet having the same source ID as the location registration packet until a predetermined time elapses after receiving a negative response to the location registration packet.

A control method of a wireless communication system according to a second aspect of the present invention is:
A control method of a wireless communication system in which a plurality of repeaters connected via a network and a wireless communication device communicate via the repeaters,
A time measurement step of measuring a time until a predetermined first time elapses when receiving a first inquiry packet inquiring a repeater to which a destination wireless communication device belongs;
If a second inquiry packet having the same source ID as that of the first inquiry packet is received while the first time has elapsed, no response is transmitted to the second inquiry packet. Steps,
A response step of transmitting a response to the first inquiry packet;
It is characterized by providing.

  Preferably, a location registration packet indicating that the wireless communication device exists in a communication range of the repeater while the first time elapses, and has the same source ID as the first inquiry packet A location registration denying step of transmitting a negative response to the location registration packet when the location registration packet is received;

A hold step of holding the response until a predetermined second time has elapsed when the first location registration packet is received;
If the inquiry packet having the same source ID as that of the first location registration packet is not received while the second time elapses, location registration that transmits an acknowledgment to the first location registration packet Steps,
When an inquiry packet having the same source ID as the first location registration packet is received while the second time elapses, the first inquiry packet having the same source ID as the first inquiry packet A selection response step of transmitting a response only to the first location registration and transmitting a negative response to the first location registration packet;
If a second location registration packet having the same source ID as the first location registration packet is received while the second time has elapsed, a negative response is sent to the second location registration packet. A selection position registration denial step to be transmitted;
It is good also as a structure provided with.

  Preferably, when an inquiry packet having the same source ID as the location registration packet is received during a predetermined time from a repeater that has transmitted an acknowledgment to the location registration packet, the first time A response is transmitted to the inquiry packet without waiting for the elapse.

A server of a wireless communication system according to a third aspect of the present invention is:
A server of a wireless communication system including a plurality of repeaters connected via a network and a wireless communication device that performs communication via the repeaters,
A time measuring means for measuring a time until a predetermined first time elapses when receiving a first inquiry packet inquiring a repeater to which a destination wireless communication device belongs;
Response means for transmitting a response to the first inquiry packet;
With
The response means responds to the second inquiry packet when receiving the second inquiry packet having the same source ID as the first inquiry packet while the first time elapses. Is not transmitted.

  Preferably, when a location registration packet indicating that a wireless communication device having the same source ID as that of the first inquiry packet exists in a communication range of a repeater is received during the elapse of the first time, Negative response means for transmitting a negative response to the location registration packet is provided.

And a holding means for holding the response until a predetermined second time has elapsed when the first location registration packet is received;
Acknowledgment means for transmitting an affirmative response to the first location registration packet when a packet having the same source ID as the first location registration packet is not received during the elapse of the second time. When,
With
When the negative response means receives a second location registration packet having the same source ID as the first location registration packet while the second time elapses, the second location registration packet Send a negative response to
When the acknowledgment means does not receive an inquiry packet having the same source ID as the first location registration packet while the second time elapses, the acknowledgment means responds to the first location registration packet. Send an acknowledgment,
When an inquiry packet having the same source ID as the first location registration packet is received while the second time elapses,
The response means transmits a response only to the first inquiry packet having the same source ID as the first location registration packet received during the elapse of the second time,
The negative response means transmits a negative response to the first location registration packet;
You may comprise.

  Preferably, the response means receives the inquiry packet having the same source ID as the location registration packet within a predetermined time from a repeater that has transmitted an acknowledgment to the location registration packet. A response is transmitted to the inquiry packet without waiting for the time 1 to elapse.

  According to the wireless communication system of the present invention, even if there are a plurality of repeaters of the same frequency channel in the communication range of the wireless communication device, communication can be performed without duplication of data.

  An embodiment of a wireless communication apparatus and a wireless communication system according to the present invention will be described with reference to the drawings. FIG. 1 shows a configuration example of a wireless communication system according to an embodiment of the present invention.

  The wireless communication system 5 includes a plurality of repeaters 2A, 2B, 2C, and 2D connected to a network 4, for example, as shown in FIG. The wireless communication system 5 includes a plurality of wireless communication devices 3A, 3B, 3C, 3D, 3E, and 3F. A server 1 is connected to the network 4.

  The network 4 is, for example, a LAN (Local Area Network). The network 4 may be a circuit switching network, a packet switching network, the Internet, or a dedicated line network. Further, the network 4 is not limited to a wired line, and may be a wireless communication network such as a wireless LAN.

  In the wireless communication system 5, communication between the wireless communication devices 3 is performed via the repeater 2. For example, the wireless communication devices 3A and 3C in FIG. 1 perform communication via the repeater 2A. In the wireless communication system 5, communication between the wireless communication devices 3 belonging to different communication ranges (repeater areas) of the repeater 2 is performed via the network 4. For example, the wireless communication devices 3A and 3D communicate via the repeater 2A, the network 4, and the repeater 2C.

  Wireless communication devices (hereinafter abbreviated as slave units) 3A to 3F communicate wirelessly with repeaters 2A to 2D. Communication from slave units 3A to 3F to repeaters 2A to 2D is referred to as uplink, and transmission from repeater 2 to slave unit 3 is referred to as downlink. The uplink and downlink are transmitted simultaneously on different frequencies, for example. The uplink and downlink may be transmitted twice in a time division manner.

  In one repeater 2, the number of channels that can be simultaneously communicated with the uplink and the downlink as one set is 1 or 2 or more. The number of simultaneous communication channels depends on the configuration of the repeater 2. In addition, although the subunit | mobile_unit 3A-3F is described like the mobile station in FIG. 1, the case of a fixed station is included.

  FIG. 2 is a block diagram showing a configuration example of the server 1 in the wireless communication system 5 according to the embodiment of the present invention. As shown in FIG. 2, the server 1 includes a control unit 11, a main storage unit 12, an external storage unit 13, a time measuring unit 14, an operation unit 15, a display unit 16, and a network interface (hereinafter, network I / F) unit 17. Prepare. The main storage unit 12, external storage unit 13, timing unit 14, operation unit 15, display unit 16 and network I / F unit 17 are all connected to the control unit 11 via the internal bus 10.

  The control unit 11 includes a CPU (Central Processing Unit) and the like, and executes processing for selecting the repeater 2 that performs communication according to a program stored in the external storage unit 13.

  The main storage unit 12 includes a RAM (Random-Access Memory) or the like, loads a program stored in the external storage unit 13, and is used as a work area of the control unit 11.

  The external storage unit 13 includes a non-volatile memory such as a flash memory, a hard disk, a DVD-RAM (Digital Versatile Disc Random-Access Memory), a DVD-RW (Digital Versatile Disc ReWritable), and the above processing is performed by the control unit 11. A program to be executed is stored in advance, and data stored in the program is supplied to the control unit 11 in accordance with an instruction from the control unit 11, and the data supplied from the control unit 11 is stored.

  The timer unit 14 can use, for example, a subtraction counter that subtracts a counter value by a clock pulse and generates an interrupt output when the counter value becomes zero. When a certain value is set in the counter, a certain time can be measured by counting the set number of clock pulses and interrupting the control unit 11.

  The timer unit 14 may be a clock that generates clock pulses at a constant period and always displays the current time. A value obtained by adding the time of the timer to the time when the timer is started is stored, and the current time of the time measuring unit 14 is compared with the stored value for each clock pulse so that the elapsed time of the timer can be known. .

  The operation unit 15 includes a pointing device such as a keyboard and a mouse, and an interface device that connects the keyboard and the pointing device to an internal bus. An identification number or the like of the slave unit 3 whose position is to be displayed is input via the operation unit 15 and supplied to the control unit 11.

  The display unit 16 is composed of a CRT (Cathode Ray Tube), an LCD (Liquid Crystal Display), or the like, and displays the position of the handset 3 to which the identification number is input so as to display the position.

  The network I / F unit 17 includes a wireless transceiver, a wireless modem or a network termination device, and a serial interface or a LAN (Local Area Network) interface connected thereto. A location registration packet or an inquiry packet is received from the repeater 2 via the network I / F unit 17, and a location registration response or an inquiry response is transmitted to the repeater 2.

  FIG. 3 is a block diagram showing the configuration of the repeater 2 according to the embodiment of the present invention. The repeater 2 shown in FIG. 3 has a transmission function and a reception function. The reception function receives a signal transmitted by the wireless communication device 3 on the uplink. The transmission function transmits a signal received by the receiver or a signal received from the network 4 on the downlink.

  As shown in FIG. 3, the repeater 2 includes an antenna 21 </ b> S, a transmission unit 22, a baseband processing unit 23, and an input unit 24 in order to realize a transmission function. The repeater 2 also includes an antenna 21R, a receiving unit 28, a baseband processing unit 27, and an output unit 26 in order to realize a receiving function. Furthermore, a network interface (hereinafter referred to as a network I / F) 25 is provided for transmitting a received signal to another repeater 2 via the network 4 and receiving a signal from the other repeater 2 via the network 4. Yes.

  The repeater 2 includes a controller 30 that controls each unit, a time measuring unit 35 that measures the timing of notification information, a display unit 36 that displays a communication mode, and an operation unit 37 that inputs settings such as a communication mode.

  The controller 30 controls the operation of the repeater 2. The controller 30 includes, for example, a CPU (central processing unit) 31, an I / O (input / output device) 32, a ROM (read only memory) 34, a RAM (read / write memory) 33, and an internal bus (not shown) for connecting them. ).

  A timer unit 35, a display unit 36, and an operation unit 37 are connected to the controller 30 via the I / O 32. In order to avoid the complexity of FIG. 3 and to facilitate understanding, signal lines from the controller 30 to each unit are omitted, but the controller 30 includes a transmission unit 22, baseband processing units 23 and 27, a reception unit 28, It is connected to the input unit 24, the output unit 26, and the network I / F 25 via the I / O 32, and controls the start and end of those processes and the processing contents.

  A control program for the controller 30 to control the operation of the repeater 2 is stored in the ROM 34. Then, the controller 30 transmits the notification information at regular intervals, and performs control to transmit the device registration information to the server 1 via the network 4 in accordance with the device registration request signal received from the slave unit 3. Further, based on the call activation signal received on the uplink, control is performed such that the call signal is transmitted from the transmission unit 22 or the call activation signal is transmitted to the network 4. Further, the controller 30 controls to transmit a call signal from the transmission unit 22 in accordance with the call activation signal received from the network 4. Information for these controls is stored in the RAM 33.

  Data for generating a communication packet to be transmitted by the repeater 2 is stored in the RAM 33 of the controller 30. For example, the RAM 33 is data for configuring the header portion of the communication frame, parameter information including the network address of the server 1 or the repeater 2 and identification information on the partner station side (Parameter Information CHannel: hereinafter referred to as PICH). Remember.

  The display unit 36 is configured by a CRT (Cathode Ray Tube), an LCD (Liquid Crystal Display), or an LED (Light Emission Diode), and the like, such as a communication status in which the repeater 2 is communicating with the wireless communication device 3 or the network 4. Display information.

  The operation unit 37 is an input means for inputting condition information regarding the operation of the repeater 2. The operation unit 37 is provided with various operation keys. That is, when the operator operates the operation key of the operation unit 37 of the repeater 2 and inputs an operation condition, the repeater 2 can perform an operation based on the input. For example, an online operation mode connected to the network 4 or a stand-alone operation mode not connected to the network 4 is selected.

  The antenna 21 </ b> R receives the radio signal transmitted to the repeater 2. The radio signal received by the antenna 21R is input to the receiving unit 28. The receiving unit 28 has a tuning function for selecting and receiving radio waves of a specific frequency. In the receiving unit 28, the frequency band of the received radio signal is set by the controller 30.

  The signal received by the receiving unit 28 is input to the baseband processing unit 27, and each piece of information is extracted by the baseband processing unit 27 and transmitted to the controller 30. When the device registration request signal is received, the ID of the child device 3 that is the originating ID is transmitted to the controller 30. The controller 30 generates device registration information at the output unit 26 and transmits it to the server 1 from the network I / F 25 via the network 4.

  The receiving unit 28, the baseband processing unit 27, the output unit 26, the network I / F 25, and the controller 30 implement means for transmitting an inquiry packet and position registration means.

  When the call activation signal is received, and the ID of the wireless communication device 3 that may exist in the communication range of the repeater 2 or the ID of the repeater 2 is included as the destination ID, the controller 30 Start sending a ringing signal. When the received signal is transmitted to another repeater 2, it is transmitted to the network 4 via the output unit 26 and the network I / F 25.

  When the signal received by the receiving unit 28 is wirelessly transmitted to the communication range of the repeater 2, data is sent from the baseband processing unit 27 to the baseband processing unit 23. The baseband processing unit 23 adds a preamble, SW (synchronization word), RI (radio information channel), etc. to the data, assembles it into a transmission frame, and outputs it to the transmission unit 22.

  The transmitter 22 has a modulation function for modulating the input signal. In the example of the repeater 2, GMSK (Gaussian filtered Minimum Shift Keying), PSK (Phase Shift Keying), QAM (Quadrature Amplitude Modulation), FSK (Frequency Shift Keying), or the like is used as a method by which the transmission unit 22 modulates a signal. It is done. The transmission unit 22 performs a process of modulating the input audio signal and data signal using these modulation methods.

  The transmission unit 22 outputs the signal subjected to the modulation process to the antenna 21S, and transmits the signal to the receiver of the wireless communication device 3 from the antenna 21S.

  The baseband processing unit 23 assembles various control signals in order to execute the communication protocol. The operation of the baseband processing unit 23, the start and end of transmission by the transmission unit 22, selection of the frequency, and the like are performed by control of the controller 30. The settings of the preamble and SW length, RI, SACCH (low-speed associated information channel), and PICH contents are controlled by the controller 30.

  From the signal received from the network 4 via the network I / F 25, data is extracted by the input unit 24 and sent to the controller 30. When transmitting a signal received from the network 4 to the communication area of the repeater 2, the data received by the network I / F 25 is sent from the input unit 24 to the baseband processing unit 23. The baseband processing unit 23 assembles a transmission signal and transmits it from the transmission unit 22.

  A call activation signal is received from the network 4 via the network I / F 25, and the ID of the wireless communication apparatus 3 that may exist in the communication area of the repeater 2 or the ID of the repeater 2 is received ID Is included, the controller 30 starts transmission of the calling signal.

  Next, operations of the server 1 and the repeater 2 shown in FIGS. 2 and 3 will be described with reference to FIGS. As described above, the operation of the server 1 is performed by the control unit 11 in cooperation with the main storage unit 12, the external storage unit 13, the time measuring unit 14, the operation unit 15, the display unit 16, and the network I / F unit 17. Do it. The operation of the repeater 2 is performed by the CPU 31 of the controller 30 in cooperation with the I / O 32, the RAM 33, the ROM 34, the time measuring unit 35, the display unit 36, and the operation unit 37.

  FIG. 4 shows a configuration example of a repeater inquiry packet. 4A shows a configuration of a repeater inquiry packet (hereinafter referred to as an inquiry packet), FIG. 4B shows a configuration of communication data of the inquiry packet, and FIG. 4C identifies a repeater 2 that transmits the inquiry packet. The configuration of the repeater ID, FIG. 4D shows the configuration of the wireless communication device ID for identifying the slave unit 3.

  As shown in FIG. 4A, the inquiry packet includes a destination address, a transmission source address, and communication data. The destination address represents an address of a packet destination on the network 4. In the case of an inquiry packet, the destination address is the network address of the server 1. The transmission source address represents an address on the network 4 of the device that transmits the packet. In the case of an inquiry packet, the source address is the network address of the repeater 2. For example, when the network 4 is the Internet or an intranet, the network address is an IP address.

  As shown in FIG. 4B, the communication data of the inquiry packet includes a message type, a user code, a system ID, a repeater ID, a calling ID, and a called ID. Among these, a code indicating a repeater inquiry is written in the message type. The identification code (ID) of the repeater 2 that transmits a repeater inquiry is written to the repeater ID.

  As shown in FIG. 4C, for example, the low-order 4 bits of the first octet of the repeater ID and the second octet include a three-digit number representing the number of the repeater 2 as BCD (Binary Coded). Decimal) The repeater ID is a unique number for each repeater 2 in the wireless communication system 5.

  The calling ID is an identification code of the handset 3 that makes a call. The called ID is an identification code of the slave unit 3 that should be received by the slave unit 3 that makes the call. The source ID and the destination ID are both wireless communication device IDs. For example, as shown in FIG. 4D, the upper 4 bits and lower 4 bits of the first octet and the upper 4 bits and lower 4 bits of the second octet , A 4-digit number represented by BCD (Binary Coded Decimal) is written. The wireless communication device ID is a unique number for each handset 3 in the wireless communication system 5.

  FIG. 5 shows a configuration example of a repeater inquiry response packet. 5A is a configuration of a repeater inquiry response packet (hereinafter referred to as a response packet), FIG. 5B is a configuration of communication data of the response packet, and FIG. 5C is a configuration of a repeater ID for identifying the repeater 2. FIG. 5D shows the configuration of the wireless communication device ID for identifying the handset 3.

  As shown in FIG. 5A, the response packet includes a destination address, a transmission source address, and communication data. The destination address is the network address of the repeater 2 that has transmitted the inquiry packet corresponding to the response packet. In the case of a response packet, the source address is the network address of the server 1.

  As shown in FIG. 5B, the communication data of the response packet includes a message type, a user code, a system ID, a calling repeater ID, a calling ID, a called repeater ID, and a called ID. Among these, a code indicating an inquiry response is written in the message type. The identification code of the repeater 2 that transmitted the repeater inquiry is written to the calling repeater ID, and the identification code of the repeater 2 in which the slave 3 of the called ID is registered (stayed) is written to the called repeater ID. As shown in FIG.5 (c), the structure of arrival repeater ID is the same structure as repeater ID shown in FIG.4 (c). Also, the configuration of the wireless communication device ID for identifying the handset 3 shown in FIG. 5D is the same as the configuration of the wireless communication device ID shown in FIG.

  FIG. 6 shows a configuration example of the location registration packet. The configuration of the location registration packet is the same as that of the inquiry packet shown in FIG. However, since the handset 3 to be received is not designated, there is no arrival ID. The message type of the location registration packet is a code representing a location registration request. The repeater ID is the ID of the repeater 2 that transmits the location registration packet. In particular, in the present embodiment, it is the ID of the repeater 2 that receives a call signal transmitted from the handset 3 and performs location registration. Wireless communication apparatus ID is ID of the subunit | mobile_unit 3 which performs the position registration which is staying in the communication range of the repeater 2 shown by repeater ID. The configuration of the repeater ID and the wireless communication device ID is the same as that of the inquiry packet.

  The response from the server 1 to the location registration packet includes an affirmative response (ACK: ACKnowledg) and a negative response (NAK: Negative AcKnowledg). The packet configuration is the same as that of the location registration packet of FIG. 6, and the message types are location registration ACK and location registration NAK, respectively. The affirmative response indicates that the location registration has been accepted by the server 1 and the slave unit 3 has been registered in the repeater 2. The negative response indicates that the position registration is not accepted and the handset 3 is not registered in the repeater 2.

  A communication procedure in the wireless communication system 5 will be described. For example, as shown in FIG. 1, it is assumed that wireless communication devices 3A to 3F and repeaters 2A to 2D exist in the wireless communication system 5. The repeaters 2A to 2D each have the configuration shown in FIG. Here, it is assumed that the radio wave of the wireless communication device 3A reaches the repeater 2A and the repeater 2B, and the same frequency channel is set for the repeater 2A and the repeater 2B.

  FIG. 7 is a diagram for explaining a communication procedure according to an embodiment of the present invention. At the start of communication, for example, when calling the handset 3D from the handset 3A, the handset 3A transmits a call signal having the handset 3D as a destination ID (step A1). The repeater 2A that has received the call signal transmits the location registration packet of the slave unit 3A to the server 1 if the location of the slave unit 3A is not registered in the repeater 2A (step A2). If the handset 3A is registered in the repeater 2A, transmission of the position registration packet may be omitted.

  When receiving the location registration packet, the server 1 holds the time response of the timer T2. The processing differs depending on whether or not a packet including the same ID as the wireless communication device ID of the location registration packet is received while the time of the timer T2 elapses. The timer T2 is set longer than the time for receiving all of the packets when the call signal of the handset 3A is received by the plurality of repeaters and the location registration packet or the inquiry packet is transmitted from the plurality of repeaters. .

  If the packet containing the same ID as the wireless communication device ID of the location registration packet is not received while the time of the timer T2 elapses, the server 1 registers the location of the handset 3A in the repeater 2A, and the location registration ACK ( (Acknowledgment) is transmitted to the repeater 2A (step A3). When the location registration ACK (acknowledgment) is transmitted from the server 1, the repeater 2A transmits to the server 1 an inquiry packet for inquiring the repeater 2 where the location of the slave unit 3D is registered (step A4).

  The server 1 searches the location registration information and transmits a response packet including the ID of the repeater 2C in which the handset 3D is registered (step A5). The repeater 2A that has obtained the location registration information of the slave unit 3D transmits a call activation signal to the repeater 2C (step A6). In that case, the call activation signal may be broadcast to the network 4, or the call activation signal may be transmitted to the repeater 2C.

  When a call activation signal is transmitted to the repeater 2C, the server 1 is inquired about the network address of the repeater 2C. The addresses of the repeaters 2A to 2D in the network 4 are given by the server 1 in the example of FIG. The server 1 also serves as, for example, a DNS (Domain Name System) server or a DHCP (Dynamic Host Configuration Protocol) server.

  The repeater 2C that has received the call activation signal transmits the call signal wirelessly (step A7). The child device 3D that has received the call signal of the repeater 2C returns a response (answerback) (step A8) and starts communication because the call signal has the identification code of the child device 3D as the destination ID. Thereafter, the repeater 2C responds (answerback) to the repeater 2A (step A9), and the repeater 2A responds (answerback) to the calling handset 3A (step A10), from the handset 3A to the handset 3D. A communication path is set. When the communication path is set, the communication of the slave unit 3A (step A11) is relayed from the repeater 2A to the repeater 2C (step A12) and transmitted from the repeater 2C to the slave unit 3D (step A13).

  Note that location registration may be performed by an inquiry packet. Alternatively, the configuration may be such that location registration is not performed when a call signal is received. In that case, the repeater 2A that has received the call signal from the slave unit 3A inquires the server 1 of the repeater area in which the slave unit 3D is registered without transmitting the location registration packet. Then, a call activation signal is transmitted to the repeater 2 </ b> C registered (position registered) that the handset 3 </ b> D is staying.

  In the wireless communication system 5 according to the embodiment of the present invention, even when a plurality of repeaters set to the same frequency channel receive signals from one slave unit at the same time, the data is not duplicated by the repeaters on the receiving side. Can communicate. Hereinafter, automatic repeater selection in the embodiment of the present invention will be described in detail.

  FIG. 8 is a diagram for explaining an example of a repeater selection procedure according to the embodiment of the present invention. FIG. 8 shows a case where the repeaters 2A and 2B receive the calling signal of the handset 3A, perform the calling process, and the location registration packet is transmitted to the server first.

  The handset 3A transmits a call signal having the handset 3D as a destination ID (step B1). The repeater 2B that has received the call signal transmits the location registration packet of the slave unit 3A to the server 1 because the slave unit 3A is not registered in the repeater 2B (step B2). When receiving the location registration packet, the server 1 holds the time response of the timer T2. Further, since the location of the slave unit 3A is registered in the repeater 2A, the repeater 2A transmits an inquiry packet for inquiring of the repeater 2 in which the location of the slave unit 3D is registered to the server (step B3).

  The timer T2 is set longer than the time for receiving all of the packets when the call signal of the handset 3A is received by the plurality of repeaters and the location registration packet or the inquiry packet is transmitted from the plurality of repeaters. . Accordingly, the inquiry packet of the repeater 2A is transmitted to the server 1 while the time of the timer T2 elapses.

  Since the inquiry packet including the same ID as the wireless communication device ID of the location registration packet is received while the time of the timer T2 elapses, the server 1 transmits a location registration NAK (negative response) to the repeater 2B (step B4). . The repeater 2B that has received the location registration NAK stops the calling process of the handset 3A. Thereafter, communication related to the slave unit 3A is not performed at least until the calling process is completed.

  The server 1 searches the location registration information and transmits a response packet including the ID of the repeater 2C where the location of the handset 3D is registered to the repeater 2A (step B5). The repeater 2A that has obtained the location registration information of the slave unit 3D transmits a call activation signal to the repeater 2C (step B6). The repeater 2C receives a call activation signal for the handset 3D only from the repeater 2A. Steps B6 to B13 are the same as steps A6 to A13 in FIG.

  The inquiry response packet (step B5) may be transmitted immediately after receiving the inquiry packet. The location registration NAK (step B4) may be transmitted immediately after receiving the inquiry packet.

  As described above, even if the location registration packet is transmitted first from the repeater 2B, the call activation signal and the communication signal generated by the call from the child device 3A to the child device 3D are transmitted only from the repeater 2A. In the repeater 2C, the transmission data to the child device 3D is not duplicated.

  FIG. 9 is a diagram for explaining a different example of the repeater selection procedure according to the embodiment of the present invention. FIG. 9 shows a case where the repeaters 2A and 2B receive the calling signal of the handset 3A, perform the calling process, and the inquiry packet is transmitted to the server first.

  The handset 3A transmits a call signal having the handset 3D as a destination ID (step C1). The repeater 2A that has received the call signal transmits an inquiry packet for inquiring of the repeater 2 in which the location of the slave 3D is registered to the server 1 because the location of the slave 3A is registered in the repeater 2A (step C2). When the server 1 receives the inquiry packet, the server 1 starts measuring the time of the timer T1.

  The repeater 2B that has received the calling signal transmits the location registration packet of the slave unit 3A to the server 1 because the location of the slave unit 3A is not registered in the repeater 2B (step C3). The timer T1 is set longer than the time for receiving all of the packets when the call signal of the handset 3A is received by the plurality of repeaters and the location registration packet or the inquiry packet is transmitted from the plurality of repeaters. . Accordingly, the location registration packet of the repeater 2B is transmitted to the server 1 while the time of the timer T1 elapses.

  The server 1 searches the location registration information, and sends a response packet including the ID of the repeater 2C where the slave unit 3D is registered to the repeater 2A in response to the first inquiry packet whose originating ID is the slave unit 3A. Transmit (step C4). Since the location registration packet including the same ID as the wireless communication device ID of the inquiry packet is received while the time of the timer T1 elapses, the server 1 transmits a location registration NAK (negative response) to the repeater 2B (step C5). . The repeater 2B that has received the location registration NAK stops the calling process of the handset 3A. Thereafter, communication related to the slave unit 3A is not performed at least until the calling process is completed.

  If the server 1 receives the location registration packets of the slave unit 3A while the time of the timer T1 elapses, the server 1 transmits a negative response to the location registration packets. Further, when another inquiry packet including the slave unit 3A as the calling ID is received while the time of the timer T1 elapses, no response packet is transmitted in response thereto.

  The repeater 2A that has obtained the location registration information of the slave unit 3D transmits a call activation signal to the repeater 2C (step C6). The repeater 2C receives a call activation signal for the handset 3D only from the repeater 2A. Steps C6 to C13 are the same as steps A6 to A13 in FIG.

  Although the response packet for the inquiry packet is described as being transmitted after the time of the timer T1 has elapsed in FIG. 9, the response packet may be transmitted immediately after receiving the inquiry packet. Similarly, the location registration NAK may be immediately transmitted to the location registration packet of the handset 3A received during the timer T1.

  As described above, when the inquiry packet is transmitted from the repeater 2A first, the call activation signal and the communication signal generated by the call from the child device 3A to the child device 3D are transmitted even if the position registration packet is transmitted. Since the data is transmitted only from the repeater 2A, the transmission data to the child device 3D is not duplicated by the repeater 2C.

  FIG. 10 is a diagram for explaining a different example of the repeater selection procedure according to the embodiment of the present invention. FIG. 10 shows a case where the repeaters 2A and 2B receive the calling signal of the handset 3A, perform call processing, and transmit location registration packets.

  The handset 3A transmits a call signal having the handset 3D as a destination ID (step D1). The repeater 2A that has received the call signal transmits the location registration packet of the slave unit 3A to the server 1 because the location of the slave unit 3A is not registered in the repeater 2A (step D2). When the server 1 receives the first location registration packet, the server 1 holds the time response of the timer T2. Since the handset 3A is not registered in the repeater 2B, the repeater 2B transmits the position registration packet of the handset 3A to the server 1 (step D3).

  The timer T2 is set longer than the time for receiving all of the packets when the call signal of the handset 3A is received by the plurality of repeaters and the location registration packet or the inquiry packet is transmitted from the plurality of repeaters. . Therefore, the position registration packet of the repeater 2B is transmitted to the server 1 while the time of the timer T2 elapses.

  If an inquiry packet having the child device 3A as an originating ID is received while the time of the timer T2 has elapsed, a negative response is transmitted to the location registration packet (see FIG. 8). In FIG. 10, since the inquiry packet is not received at the time of timer T2, a location registration ACK (acknowledgment) is transmitted for the first location registration packet of handset 3A (step D4).

  Since the position registration packet including the same ID as the wireless communication apparatus ID of the position registration packet is received while the time of the timer T2 elapses, the server 1 transmits a position registration NAK (negative response) to the repeater 2B (step D5). ). The repeater 2B that has received the location registration NAK stops the calling process of the handset 3A. Thereafter, communication related to the slave unit 3A is not performed at least until the calling process is completed.

  The repeater 2A that has received the position registration ACK transmits an inquiry packet for inquiring of the repeater 2 whose position is registered to the slave unit 3D to the server (step D6). The server 1 searches the location registration information, and transmits a response packet including the ID of the repeater 2C where the location of the handset 3D is registered to the repeater 2A (step D7). The repeater 2A that has obtained the location registration information of the slave unit 3D transmits a call activation signal to the repeater 2C (step D8). The repeater 2C receives a call activation signal for the handset 3D only from the repeater 2A. Steps D8 to D15 are the same as steps A6 to A13 in FIG.

  Note that the location registration NAK may be immediately transmitted to the location registration packet of the slave unit 3 received while the time of the timer T2 elapses. Even if other packets are received during the timer T2, the transmission of the location registration NAK remains the same. On the other hand, the location registration ACK is transmitted after the timer T2 has elapsed. This is because a negative response is transmitted to the location registration packet when an inquiry packet having the child device 3A as an originating ID is received while the time of the timer T2 elapses.

  When the inquiry packet is received (step D6), the timer T1 should be started. However, if it is not time for a new call signal to be transmitted from the handset 3A, the processing of the timer T1 can be omitted. When the repeater ID of the inquiry packet is the repeater 2A that has transmitted the location registration ACK immediately before, the inquiry response packet is immediately transmitted.

  As described above, even if the location registration packets are transmitted from the plurality of repeaters 2A and 2B, the call activation signal and the communication signal generated by the call from the slave unit 3A to the slave unit 3D are initially the location registration packet. Is transmitted only from the repeater 2 </ b> A that has transmitted “”, the transmission data to the child device 3 </ b> D does not overlap in the repeater 2 </ b> C.

  Next, the operation of the repeater selection process will be described. FIG. 11 is a flowchart illustrating an example of an operation of selecting a repeater of the server 1.

  The control unit 11 of the server 1 sets a counter to 0 (step S1) and waits for reception of a packet (step S2, step S3; No). If a packet is received (step S3; Yes), the process branches depending on the type of packet (step S4).

  When the inquiry packet is received (step S4; inquiry), the timer T1 is started (step S5), and an inquiry response packet is transmitted in response to the inquiry packet (step S6). While the time of the timer T1 elapses, the packet is received (step S7), and if it is not the same originating ID as the previously received inquiry packet (step S8; No), the processing for the originating ID is performed (others) Process it).

  If a packet with the same child device ID is received (step S8; Yes), if the packet is a location registration packet (step S9; Yes), a negative response (location registration NAK) is transmitted (step S10). . If the timer T1 has not elapsed (step S11; No), the process is repeated from packet reception (step S7). If the timer T1 has elapsed (step S11; Yes), the process returns to the beginning and the counter is set to 0 (step S1).

  Here, the transmission of the inquiry response packet (step S6) may be performed after the timer T1 has elapsed (step S11; Yes) (see FIG. 9), but the transmission is performed immediately after receiving the first inquiry packet. Processing is faster. In particular, when an inquiry packet is received with the same origination ID from the repeater 2 that has just transmitted a location registration ACK, a response packet is immediately transmitted.

  Returning to step S4, if a location registration packet is received (step S4; location registration), the timer T2 is started (step S12), and packets of the same slave unit ID are received until the time of the timer T2 elapses. (Step S13, Step S14; No, Step S20; No). If a packet with the same slave ID as the previously received location registration packet is received (step S14; Yes), if the packet is a location registration packet (step S15; Yes), a negative response (location registration NAK) is received. ) Is transmitted (step S16).

  If the received packet is the same slave unit ID and is not a location registration, that is, an inquiry packet (step S15; No), it is checked whether the counter is 0 (step S17). If the counter is 0 (step S17; Yes), that is, if it is the first inquiry packet, a response packet is transmitted in response to the inquiry packet (step S18). If the counter is not 0 (step S17; No), the response packet is not transmitted. Then, 1 is added to the counter (step S19), and the process is repeated from the packet reception (step S13).

  When the time of the timer T2 has elapsed (step S20; Yes), if the counter is 0 (step S21; Yes), the inquiry response packet is not transmitted (that is, the inquiry packet of the same slave unit ID is not received). Therefore, an affirmative response (location registration ACK) is transmitted in response to the first location registration packet (step S22). If the counter is not 0 (step S21; No), a negative response (position registration NAK) is transmitted to the first position registration packet (step S23). Then, returning to the beginning, the counter is set to 0 (step S1).

  As described above, according to the wireless communication system 5 of the present invention, even if a location registration packet or an inquiry packet is transmitted from a plurality of repeaters 2A, 2B, a call generated by a call from the child device 3A to the child device 3D. Since the activation signal and the communication signal are transmitted only from the repeater 2A selected by the server 1, the transmission data to the child device 3D is not duplicated by the repeater 2C. Accordingly, when a plurality of repeaters 2 receive radio waves from the wireless communication device 3 at the same time, the repeater 2 to be communicated can be automatically selected to perform normal communication.

  According to the wireless communication system 5 of the present invention, even if there are a plurality of repeaters 2 having the same frequency channel in the communication range of the wireless communication device 3, communication can be performed without duplication of data. In addition, the frequency channels used in the wireless communication system 5 can be reduced. And generation | occurrence | production of intermodulation etc. can be avoided.

  In addition, the hardware configuration and the flowchart described above are merely examples, and can be arbitrarily changed and modified.

  A server 1 including a control unit 11, a main storage unit 12, an external storage unit 13, a timing unit 14, a network I / F unit 17, and a repeater 2 including a CPU 31, an I / O 32, a RAM 33, a ROM 34, and the like. The controller 30 can be realized by using a normal computer system without using a dedicated system. For example, a computer program for executing the above operation is stored and distributed in a computer-readable recording medium (flexible disk, CD-ROM, DVD-ROM, etc.), and the computer program is installed in the computer. Thus, the server 1 or the repeater 2 that executes the above-described processing may be configured. Alternatively, the server 1 or the repeater 2 may be configured by storing the computer program in a storage device included in a server device on a communication network such as the Internet and downloading the computer program from a normal computer system.

  Further, when the functions of the server 1 or the repeater 2 are realized by sharing an OS (operating system) and an application program, or by cooperation between the OS and the application program, only the application program portion is stored in a recording medium or a storage device. It may be stored.

  It is also possible to superimpose a computer program on a carrier wave and distribute it via a communication network. For example, the computer program may be posted on a bulletin board (BBS, Bulletin Board System) on a communication network, and the computer program distributed via the network. The computer program may be started and executed in the same manner as other application programs under the control of the OS, so that the above-described processing may be executed.

It is a block diagram which shows an example of the radio | wireless communications system which is one embodiment of this invention. It is a block diagram which shows the structural example of the radio | wireless communication server in one embodiment of this invention. It is a block diagram which shows the structural example of the repeater in one embodiment of this invention. It is a figure which shows the structural example of a repeater inquiry packet. It is a figure which shows the structural example of a repeater inquiry response packet. It is a figure which shows the structural example of a location registration packet. It is a figure explaining the communication procedure in one embodiment of this invention. It is a figure explaining the example of the selection procedure of the repeater in one embodiment of this invention. It is a figure explaining the example from which the selection procedure of the repeater in one embodiment of this invention differs. It is a figure explaining the example from which the selection procedure of the repeater in one embodiment of this invention differs. It is a flowchart which shows an example of the operation | movement of the process which selects a repeater. It is a figure explaining the conventional communication procedure.

Explanation of symbols

1 server 2, 2A, 2B, 2C, 2D repeater 3, 3A, 3B, 3C, 3D wireless communication device
4 network
5 Wireless communication systems
10 Internal bus
11 Control unit
12 Main memory
13 External storage
14 Timekeeping Department
15 Operation unit
16 Display section
17 Network interface
22 Transmitter
23 Baseband processing unit
25 Network interface
27 Baseband processor
28 Receiver
30 controller
31 CPU
32 I / O
33 RAM
34 ROM
35 Timekeeping Department
37 Operation unit

Claims (13)

A wireless communication system including a plurality of repeaters connected via a network and a wireless communication device that performs communication via the repeaters,
The repeater includes means for transmitting an inquiry packet for inquiring a repeater to which a destination wireless communication device belongs when receiving a call from the wireless communication device;
The inquiry packet includes a source ID which is information for identifying the calling wireless communication device,
The wireless communication system includes:
A time measuring means for measuring a time until a predetermined first time elapses when the first inquiry packet is received;
Response means for transmitting a response to the first inquiry packet;
Comprising a server connected to the network comprising:
The response means responds to the second inquiry packet when receiving the second inquiry packet having the same source ID as the first inquiry packet while the first time elapses. A wireless communication system characterized by not transmitting. The repeater comprises location registration means for transmitting a location registration packet indicating that the wireless communication device exists in a communication range of the repeater,
When the server receives a location registration packet having the same source ID as that of the first inquiry packet while the first time has elapsed, the server sends a negative response to the location registration packet. Comprising response means,
The wireless communication system according to claim 1. The server
A holding means for holding the response until a predetermined second time has elapsed when the first location registration packet is received;
Acknowledgment means for transmitting an affirmative response to the first location registration packet when a packet having the same source ID as the first location registration packet is not received during the elapse of the second time. When,
With
When the negative response means receives a second location registration packet having the same source ID as the first location registration packet while the second time elapses, the second location registration packet Send a negative response to
When the acknowledgment means does not receive an inquiry packet having the same source ID as the first location registration packet while the second time elapses, the acknowledgment means responds to the first location registration packet. Send an acknowledgment,
When an inquiry packet having the same source ID as the first location registration packet is received while the second time elapses,
The response means transmits a response only to the first inquiry packet having the same source ID as the first location registration packet received during the elapse of the second time,
The negative response means transmits a negative response to the first location registration packet;
The wireless communication system according to claim 2.   The response means receives the inquiry packet having the same source ID as the location registration packet within a predetermined time from the repeater that has transmitted an acknowledgment to the location registration packet. 4. The wireless communication system according to claim 2, wherein a response to the inquiry packet is transmitted without waiting for elapse of time.   The repeater does not transmit a packet having the same source ID as the location registration packet until a predetermined time elapses after receiving a negative response to the location registration packet. 3. The wireless communication system according to 3. A control method of a wireless communication system in which a plurality of repeaters connected via a network and a wireless communication device communicate via the repeaters,
A time measurement step of measuring a time until a predetermined first time elapses when receiving a first inquiry packet inquiring a repeater to which a destination wireless communication device belongs;
If a second inquiry packet having the same source ID as that of the first inquiry packet is received while the first time has elapsed, no response is transmitted to the second inquiry packet. Steps,
A response step of transmitting a response to the first inquiry packet;
A control method comprising:   A location registration packet indicating that the wireless communication device is within the communication range of the repeater while the first time has elapsed, and a location registration packet having the same source ID as the first inquiry packet The control method according to claim 6, further comprising a location registration denying step of transmitting a negative response to the location registration packet when receiving the location registration packet. A holding step of holding the response until a predetermined second time elapses when receiving the first location registration packet;
If the inquiry packet having the same source ID as that of the first location registration packet is not received while the second time elapses, location registration that transmits an acknowledgment to the first location registration packet Steps,
When an inquiry packet having the same source ID as the first location registration packet is received while the second time elapses, the first inquiry packet having the same source ID as the first inquiry packet A selection response step of transmitting a response only to the first location registration and transmitting a negative response to the first location registration packet;
If a second location registration packet having the same source ID as the first location registration packet is received while the second time has elapsed, a negative response is sent to the second location registration packet. A selection position registration denial step to be transmitted;
The control method according to claim 7, further comprising:   If an inquiry packet having the same source ID as the location registration packet is received within a predetermined time from a repeater that has transmitted an acknowledgment to the location registration packet, the first time elapses. The control method according to claim 7 or 8, wherein a response to the inquiry packet is transmitted without waiting. A server of a wireless communication system including a plurality of repeaters connected via a network and a wireless communication device that performs communication via the repeaters,
A time measuring means for measuring a time until a predetermined first time elapses when receiving a first inquiry packet inquiring a repeater to which a destination wireless communication device belongs;
Response means for transmitting a response to the first inquiry packet;
With
The response means responds to the second inquiry packet when receiving the second inquiry packet having the same source ID as the first inquiry packet while the first time elapses. A server of a wireless communication system characterized by not transmitting If the wireless communication apparatus having the same source ID as that of the first inquiry packet receives a position registration packet indicating that it exists in the communication range of the repeater while the first time elapses, the position registration is performed. A negative response means for transmitting a negative response to the packet;
The server according to claim 10. A holding means for holding the response until a predetermined second time has elapsed when the first location registration packet is received;
Acknowledgment means for transmitting an affirmative response to the first location registration packet when a packet having the same source ID as the first location registration packet is not received during the elapse of the second time. When,
With
When the negative response means receives a second location registration packet having the same source ID as the first location registration packet while the second time elapses, the second location registration packet Send a negative response to
When the acknowledgment means does not receive an inquiry packet having the same source ID as the first location registration packet while the second time elapses, the acknowledgment means responds to the first location registration packet. Send an acknowledgment,
When an inquiry packet having the same source ID as the first location registration packet is received while the second time elapses,
The response means transmits a response only to the first inquiry packet having the same source ID as the first location registration packet received during the elapse of the second time,
The negative response means transmits a negative response to the first location registration packet;
The server according to claim 11.   The response means receives the inquiry packet having the same source ID as the location registration packet within a predetermined time from the repeater that has transmitted an acknowledgment to the location registration packet. The server according to claim 11 or 12, wherein a response to the inquiry packet is transmitted without waiting for elapse of time.

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