JP4680692B2 - Communications system - Google Patents

Communications system Download PDF

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JP4680692B2
JP4680692B2 JP2005176065A JP2005176065A JP4680692B2 JP 4680692 B2 JP4680692 B2 JP 4680692B2 JP 2005176065 A JP2005176065 A JP 2005176065A JP 2005176065 A JP2005176065 A JP 2005176065A JP 4680692 B2 JP4680692 B2 JP 4680692B2
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wireless module
wireless
distance
plurality
inquiry
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JP2006352518A (en
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好美 佐藤
廉 大村
潔 小暮
太 納谷
春生 野間
伸一 長村
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株式会社国際電気通信基礎技術研究所
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Description

  The present invention relates to a communication system, and more particularly, to a communication system capable of detecting a wireless module close to a certain wireless module.

  Conventionally, a SPIDER system is known as a system for detecting the position of each object (Non-Patent Document 1).

  This SPIDER system consists of one receiver and a plurality of transmitters. The receiver is fixed to the room, and a plurality of transmitters are attached to each object. Each of the plurality of transmitters has a batch shape and receives power from a battery. Each of the plurality of transmitters always transmits an identification code unique to the transmitter, and the receiver receives signals from the plurality of transmitters, and detects transmitters existing in the vicinity of the transmitter.

In addition, an E-nightingale system is known that automatically records the behavior of each nurse and analyzes the collected data to help improve work and investigate the cause of an accident (Patent Document 1). . In this system, sensors fixed to buildings rooms and corridors, etc. and sensors attached to people measure and transmit data on nurses' behavior, and a microcomputer with a wireless modem chip is connected to the sensor. Receive data on nurses' behavior by receiving radio waves.
JP 2004-157614 A "Real-Time Identification & Locating System", [online], 25 May 2004, [Search June 13, 2005], Internet <URL: www. rtcode. com>

  However, in the conventional SPIDER system, since a plurality of transmitters have only a transmission function and no reception function, other transmitters (consisting of a transmitter and a receiver) that are present in the vicinity of the transmitter alone. There is a problem that it cannot be detected.

  Further, in the E-nightingale system, there is a problem that the microcomputer places a burden on the microcomputer because the microcomputer transmits and receives radio waves.

  Accordingly, the present invention has been made to solve such a problem, and an object of the present invention is to provide a communication system including a wireless module that can reduce the burden on the microcomputer and can detect other adjacent units. It is to be.

  According to the present invention, the communication system is a communication system that detects a wireless module that exists within a certain distance from one wireless module, and includes a plurality of wireless modules and a plurality of terminal devices. The plurality of wireless modules can wirelessly communicate with each other. The plurality of terminal devices are provided corresponding to the plurality of wireless modules, and each controls the corresponding wireless module. Each of the plurality of wireless modules detects the received signal strength of the received signal received from another wireless module by wireless communication. Each of the plurality of terminal devices detects the distance between the corresponding wireless module and another wireless module based on the received signal strength detected by the corresponding wireless module, and the detected distance is a reference value. When it is below, another wireless module is determined as a close proximity wireless module existing within a certain distance from the corresponding wireless module.

  Preferably, each of the plurality of terminal devices determines another wireless module as a proximity wireless module when the detected distance is substantially constant for a certain period of time.

  Preferably, each of the plurality of terminal devices holds a map indicating the relationship between the received signal strength and the distance, extracts a distance corresponding to the received signal strength of the received received signal with reference to the map, and The extracted distance is detected as a distance between itself and another wireless module.

  Preferably, each of the plurality of wireless modules transmits an inquiry signal for inquiring about the presence of the proximity wireless module to the surroundings by wireless communication according to control from the corresponding terminal device, and another response signal for the inquiry signal is transmitted by wireless communication. The received response signal strength is detected as the received signal strength of the received signal.

  Preferably, when each of the plurality of terminal devices receives the address of the other wireless module determined to be the proximity wireless module from the corresponding wireless module, the owner name or installation location of the other wireless module determined to be the proximity wireless module The name, distance, and address are associated with each other, and the associated owner name or installation location name, distance, and address are stored in the storage means as history information.

  Preferably, each of the plurality of terminal devices holds a correspondence table in which a plurality of addresses of the plurality of wireless modules and a plurality of owner names of the plurality of wireless modules are associated with each other, and addresses are assigned from the corresponding wireless modules. Upon receipt, the owner name or installation location name corresponding to the received address is extracted with reference to the correspondence table, and the history information is created by associating the extracted owner name or installation location name with the address and distance. The created history information is stored in the storage means.

  Preferably, each of the plurality of terminal devices reads the history information from the storage unit, and registers the read history information in the server.

  Preferably, the plurality of wireless modules and the plurality of terminal devices are used in a medical institution.

  In the communication system according to the present invention, each of the plurality of wireless modules detects the received signal strength of the received signal received by wireless communication from the other wireless module, and each of the plurality of terminal devices is detected by the corresponding wireless module. Based on the received signal strength, the distance between the corresponding wireless module and the other wireless module is detected, and when the detected distance is less than the reference value, the other wireless module is fixed from the corresponding wireless module. It is determined as a close proximity wireless module existing within the distance. That is, each of the plurality of terminal devices detects a wireless module whose distance from the corresponding wireless module is a reference value or less as a proximity wireless module.

  Therefore, according to the present invention, it is possible to reduce the burden on the microcomputer and detect other wireless modules in the vicinity.

  Embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and description thereof will not be repeated.

  FIG. 1 is a schematic diagram of a communication system according to an embodiment of the present invention. The communication system 100 includes a plurality of wireless modules 11 to 14, a built-in CPU (Central Processing Unit) 21, a PDA (Personal Digital Assistant) 22, a plurality of terminal devices 23 and 24, a server 30, and a plurality of microphones. (Hereinafter referred to as “microphone”) 31 and 32. The communication system 100 is installed in a medical institution such as a hospital, for example.

  The embedded CPU 21, the PDA 22, and the terminal devices 23 and 24 are provided corresponding to the wireless modules 11 to 14, respectively, and are connected to the corresponding wireless modules 11 to 14. The wireless module 11 and the built-in CPU 21 constitute a portable unit 20.

  The microphone 31 is connected to the built-in CPU 21 of the mobile unit 20, and the microphone 32 is connected to the PDA 22. When the microphones 31 and 32 are turned on by the operator, the microphones 31 and 32 output ON signals to the built-in CPU 21 and the PDA 22, respectively. When the microphones 31 and 32 are turned off by the operator, the microphones 31 and 32 output OFF signals to the built-in CPU 21 and the PDA 22, respectively.

  Persons working in medical institutions such as doctors, nurses, and technicians in medical institutions (eg, radiographers) carry the portable unit 20 or the wireless module 12 and the PDA 22. Accordingly, the wireless modules 11 and 12 are provided corresponding to persons working in a medical institution, and can move within a medical institution such as a hospital.

  On the other hand, the wireless modules 13 and 14 and the terminal devices 23 and 24 are installed in a predetermined room in the hospital. Therefore, the wireless modules 13 and 14 are provided corresponding to a predetermined room in the hospital.

  Since the embedded CPU 21 and the PDA 22 of the portable unit 20 can move within a medical institution such as a hospital, the server 30 can be accessed by wireless communication. Further, since the terminal devices 23 and 24 are installed in a room, the terminal devices 23 and 24 are always connected to the cable 40 and can access the server 30 via the cable 40.

  Each of the wireless modules 11 to 14 includes, for example, a Bluetooth module, and each of the terminal devices 23 and 24 includes, for example, a laptop personal computer.

  The wireless modules 11 to 14, the embedded CPU 21, the PDA 22, and the terminal devices 23 and 24 are arranged in a wireless communication space, and the wireless modules 11 to 14 transmit and receive signals to each other through wireless communication.

  More specifically, each of the wireless modules 11 to 14 transmits (broadcasts) an inquiry signal to the surroundings using a Bluetooth standard inquiry state, and sends a response signal to the inquiry signal from another wireless module. Receive. Each of the wireless modules 11 to 14 detects the received signal strength of the received response signal, and transmits the detected received signal strength to the embedded CPU 21, PDA 22, and terminal devices 23 and 24 to which the wireless module 11 to 14 is connected. To do.

  Each of the wireless modules 11 to 14 detects the address of another wireless module from the response signal, and transmits the detected address to the embedded CPU 21, PDA 22, and terminal devices 23 and 24 to which the wireless module is connected.

  Each of the embedded CPU 21, the PDA 22, and the terminal devices 23 and 24 receives the addresses and received signal strengths of other wireless modules from the corresponding wireless modules 11 to 14. And each of built-in CPU21, PDA22, and the terminal devices 23 and 24, based on the received signal strength received, the distance between the corresponding wireless module 11-14 and the other wireless module that transmitted the response signal. When the detected distance is equal to or smaller than the reference value, another wireless module is determined as a close proximity wireless module existing within a certain distance (for example, 3 m) from the corresponding wireless module 11-14.

  The embedded CPU 21 and the PDA 22 receive an on / off signal composed of an ON signal or an OFF signal from the microphones 31 and 32, respectively.

  Further, each of the embedded CPU 21, PDA 22 and terminal devices 23 and 24 determines the owner name or installation location of another wireless module based on the address received from the corresponding wireless module (any one of the wireless modules 11 to 14). Extract by the method you want. Each of the embedded CPU 21, PDA 22, and terminal devices 23, 24 associates the extracted owner name or installation location name, address, distance, and on / off signal with each other and associates the associated owner The name or location name, address, distance, and on / off signal are stored as history information.

  Further, each of the embedded CPU 21, the PDA 22, and the terminal devices 23 and 24 periodically reads the history information stored in the storage device 220 and outputs the read history information to the server 30 via the cable 40.

  Further, each of the embedded CPU 21, PDA 22, and terminal devices 23, 24 transmits a history table output request to the server 30 via the cable 40 in response to a history information acquisition request from the operator, and displays the history table. Receive from the server 30 via the cable 40. Then, each of the embedded CPU 21, the PDA 22, and the terminal devices 23 and 24 displays the received history table on a display unit (not shown).

  The server 30 creates a history table by a method to be described later based on the history information received from the embedded CPU 21, the PDA 22 and the terminal devices 23 and 24. Further, the server 30 transmits the history table to the embedded CPU 21, PDA 22, and terminal devices 23, 24 via the cable 40 in response to a history table output request from the embedded CPU 21, PDA 22, and terminal devices 23, 24. .

  FIG. 2 is a functional block diagram of the wireless module 11 and the embedded CPU 21 shown in FIG. The wireless module 11 includes a protocol management unit 110, a transmission processing unit 120, a wireless unit 130, and a reception processing unit 140.

  The protocol management unit 110 generates an inquiry transmission instruction (Inquiry transmission instruction) and an inquiry response instruction (Inquiry Scan instruction) according to control from the microcomputer 210 of the embedded CPU 21 and outputs the inquiry transmission instruction (Inquiry Scan instruction) to the transmission processing unit 120.

  Further, the protocol management unit 110 receives an FHS packet, which will be described later, and a received signal strength RSSI of the FHS packet from the reception processing unit 140. Then, the protocol management unit 110 detects the address of the wireless module (any one of the wireless modules 11 to 14) that transmitted the FHS packet from the received FHS packet, and receives the detected address from the reception processing unit 140. The received signal strength RSSI is transmitted to the microcomputer 210.

  The transmission processing unit 120 sequentially generates an inquiry signal (= IQ packet) for inquiring whether or not there is a proximity wireless module around the wireless module 11 in response to an inquiry transmission command from the protocol management unit 110. The sequentially generated IQ packets are output to the wireless unit 130.

  Further, the transmission processing unit 120 generates a response signal (= FHS packet) corresponding to the inquiry signal (= IQ packet) received from another wireless module in response to the inquiry response command from the protocol management unit 110 to generate a wireless signal. Output to unit 130.

  The wireless unit 130 transmits and receives packets by spread spectrum. More specifically, the wireless unit 130 employs a frequency hopping method with a speed of 1600 times / second, and converts the information modulation signal (1 MHz) to 79 channels (1 MHz / channel) within the band of 2402 to 2481.5 MHz. Hopping and spread modulation to 79 MHz band. The wireless unit 130 transmits and receives the spread modulated packet.

  When the wireless unit 130 receives the IQ packet from the transmission processing unit 120, the wireless unit 130 performs frequency hopping on the received IQ packet according to the inquiry hopping sequence and transmits the IQ packet. More specifically, the wireless unit 130 transmits the IQ packet by frequency hopping to 32 channels or 16 channels within a band of 2402 to 2481.5 MHz.

  In addition, when the wireless unit 130 receives the FHS packet from the transmission processing unit 120, the wireless unit 130 performs frequency hopping on the received FHS packet according to the response sequence and transmits the packet. More specifically, the wireless unit 130 transmits the FHS packet by frequency hopping to 32 channels or 16 channels within a band of 2402 to 2481.5 MHz.

  Further, the wireless unit 130 receives an IQ packet from another wireless module and outputs the received IQ packet to the reception processing unit 140.

  When receiving the IQ packet from the wireless unit 130, the reception processing unit 140 detects the received signal strength RSSI of the received IQ packet. Then, the reception processing unit 140 performs spectrum despreading on the IQ packet, and outputs the IQ packet after the spectrum despreading and the detected received signal strength RSSI to the protocol management unit 110.

  The embedded CPU 21 includes a microcomputer 210, a storage device 220, and a display unit 230. The microcomputer 210 controls the protocol management unit 110 of the wireless module 11 so as to start or interrupt the inquiry transmission, and also controls the protocol management unit 110 to start or interrupt the inquiry response.

  Further, the microcomputer 210 holds a correspondence table in which the addresses of the wireless modules 11 to 14 are associated with the owner names or the installation location names of the wireless modules 11 to 14.

  Further, the microcomputer 210 receives the address and the received signal strength RSSI from the protocol management unit 110. When the microcomputer 210 receives the received signal strength RSSI, the microcomputer 210 detects the distance between the wireless module 11 and another wireless module based on the received received signal strength RSSI by a method described later, and the detected distance is When the value is equal to or less than the reference value (= 3 m), another wireless module is determined as the close proximity wireless module.

  Note that the microcomputer 210 discards the detected distance when the detected distance is larger than the reference value, that is, when the wireless module that has transmitted the FHS packet is not determined as the close proximity wireless module.

  Further, the microcomputer 210 receives an on / off signal from the microphone 31.

  Further, when the microcomputer 210 determines that the detected distance is less than or equal to the reference value, the microcomputer 210 refers to the owner name or the installation location name corresponding to the received address together with the received signal strength RSSI that is the basis of the determination. The extracted owner name or installation location name, address, distance, and on / off signal are associated with each other. The microcomputer 210 stores the associated owner name or installation location name, address, distance, and on / off signal in the storage device 220 as history information.

  In this case, if the microcomputer 210 receives an address from the protocol management unit 110, the microcomputer 210 stores the received address and the detected distance as history information even if the received address is the same as the already received address. The data is sequentially stored in the device 220.

  Further, the microcomputer 210 periodically reads the history information stored in the storage device 220, transmits the read history information to the server 30 via the cable 40, and sends the history information stored in the storage device 220 to the server 30. sign up.

  Furthermore, the microcomputer 210 transmits a history table output request to the server 30 via the cable 40 and receives the history table from the server 30 via the cable 40 in response to a history information acquisition request from the operator. . Then, the microcomputer 210 displays the received history table on the display unit 230.

  The storage device 220 stores the owner name or installation location name, address, distance, and on / off signal as history information.

  The display unit 230 gives various information such as a history table received by the microcomputer 210 from the server 30 to the operator as visual information.

  Each of the wireless modules 12 to 14 shown in FIG. 1 has the same configuration as the wireless module 11 shown in FIG. 2, and each of the PDA 22 and the terminal devices 23 and 24 shown in FIG. It consists of the same composition.

  Similarly to the microcomputer 210 of the embedded CPU 21, the microcomputer 210 of the PDA 22 receives an on / off signal from the microphone 32 and stores the received on / off signal in association with the owner name, address, and distance. Store in device 220.

  On the other hand, the microcomputer 210 of the terminal devices 23 and 24 does not receive an on / off signal from the microphone, associates the installation location name, address and distance with each other, and associates the associated installation location name, address and distance with each other. It is stored in the storage device 220 as history information.

  FIG. 3 is a conceptual diagram showing the connection between the wireless module 11 and the embedded CPU 21 shown in FIG. The wireless module 11 includes an antenna 11A and performs wireless communication with the other wireless modules 12 to 14 via the antenna 11A.

  The wireless module 11 exchanges data and signals with the embedded CPU 21 via the RS232C.

  The wireless modules 12 to 14 shown in FIG. 1 are connected to the PDA 22 and the terminal devices 23 and 24 via the RS232C, respectively, similarly to the wireless module 11 and the embedded CPU 21 shown in FIG. , 24 exchange data and signals.

  FIG. 4 is a diagram illustrating various states according to the Bluetooth standard. The Bluetooth standard includes a non-connection state, a connection stage, a connection state, and a low power consumption state. The non-connected state is a standby state, and always enters the reception state at every Bluetooth clock timing (1.28 seconds) in order to avoid power consumption during reception. In this case, the current consumption in the reception state is about 30 μA.

  The connection stage includes an inquiry state and a page state. The inquiry state is a state performed for the master to recognize peripheral slaves. At this point of time, first, it is in a state in which the possibility of connection is inquired in a state where various addresses are not allocated.

  In the calling state, both the master and the slave recognize each other for the first time, and at this point, the slave becomes active and receives the allocation of the active member address.

  The connection state includes an active state and a data transmission state. The active state and the data transmission state are states where communication is actually performed.

  The low power consumption state includes a park state, a hold state, and a sniff state. In the park state, peripheral devices are recognized, and a park member address is assigned.

  The hold state is a standby connection, and the sniff state is a standby state that does not relate to traffic, and is a state in which power consumption is further suppressed as compared with the hold state.

  As described above, there are various states in the Bluetooth standard. In the present invention, the wireless modules 11 to 14 are connected to the non-connection state and the connection state inquiry (Inquiry) among the various states in the Bluetooth standard. The proximity wireless module is detected using the state.

  FIG. 5 is a conceptual diagram for explaining the inquiry state in detail. The inquiry state includes Inquiry_Scan_Interval, Inquiry_Scan_Window, Inquiry_Length, and Inquiry_Interval.

  Inquiry_Scan_Interval is the time from the start of an inquiry response (Inquiry_Scan) until the start of an inquiry response (Inquiry_Scan). Inquiry_Scan_Window is a duration of an inquiry response (Inquiry_Scan), and is a time during which an inquiry (Inquiry) can be received.

  Inquiry_Length is the maximum time that can be continued before the inquiry stops. Inquiry_Interval is the time from the start of an inquiry (Inquiry) to the start of the next inquiry (Inquiry).

  FIG. 6 is a timing chart for explaining the inquiry operation. In FIG. 6, a case where the wireless module 11 transmits (broadcasts) an inquiry signal to the wireless modules 12 to 14 and receives responses to the inquiry from the wireless modules 12 and 13 will be described.

  When the inquiry (Inquiry) is started, the microcomputer 210 of the embedded CPU 21 transmits an inquiry inquiry start command to the wireless module 11 via the RS232C, and the protocol management unit 110 of the wireless module 11 receives the inquiry via the RS232C. Receives a transmission start command.

  Then, the protocol management unit 110 generates an inquiry transmission instruction in response to the inquiry transmission start instruction and outputs the inquiry transmission instruction to the transmission processing unit 120. In response to the inquiry transmission command from the protocol management unit 110, the transmission processing unit 120 continuously generates an inquiry signal (IQ packet) for inquiring about the presence of the proximity wireless module to the wireless module 11, and continuously generates the inquiry signal. The IQ packets are sequentially output to the wireless unit 130.

  In this case, the transmission processing unit 120 generates an IQ packet including an access code (IAC: Inquiry Access Code). The IAC is an inquiry access code, and includes a general inquiry access code (GIAC: General IAC) and a specific inquiry access code (DIAC: Dedicated IAC).

  GIAC is an access code common to all wireless modules, and is used to discover other wireless modules existing in the communication range. The DIAC is an access code common to a group of specific wireless modules, and is used to discover the wireless modules of group members existing in the communication range.

  In the present invention, either GIAC or DIAC is selected and used according to the application. That is, among the wireless modules of all persons working at medical institutions, when the wireless module of the group member is the target of the proximity wireless module, the DIAC is used as an access code, and the wireless modules of all persons at the medical institutions are used. GIAC is used as an access code.

  Accordingly, the transmission processing unit 120 generates an IQ packet that includes one of GIAC and DIAC as an access code.

  Then, the radio unit 130 performs frequency hopping on the IQ packet received from the transmission processing unit 120 according to the inquiry hopping sequence (32 channel or 16 channel hopping), and broadcasts the frequency hopped IQ packet to the surroundings.

  In this case, when the wireless unit 130 continuously receives a plurality of IQ packets from the transmission processing unit 120, the wireless unit 130 sequentially frequency hops the plurality of IQ packets and sequentially transmits the plurality of IQ packets subjected to the frequency hopping. That is, the wireless unit 130 broadcasts the IQ packet to the periphery of the wireless module 11 at the frequencies f (k), f (k + 1),... (See step 1).

  Then, if the wireless module 12 receives an IQ packet at the frequency f (k), the wireless module 12 waits for an appropriate frame (random number 0 to 1023: RAND), and after receiving the same IQ packet again. A response signal (FHS packet) to the inquiry signal (IQ packet) is returned (see step 2).

  More specifically, the wireless unit 130 of the wireless module 12 receives the IQ packet broadcast from the wireless module 11 and outputs the received IQ packet to the reception processing unit 140. Then, the reception processing unit 140 despreads the spectrum of the IQ packet and outputs it to the protocol management unit 110.

  When the protocol management unit 110 of the wireless module 12 receives the same IQ packet again from the reception processing unit 140, the protocol management unit 110 outputs a command for transmitting a response signal (FHS packet) to the transmission processing unit 120. The transmission processing unit 120 of the wireless module 12 generates an FHS packet including the address BD_Address of the wireless module 12 in response to a command from the protocol management unit 110 and outputs the FHS packet to the wireless unit 130.

  The wireless unit 130 of the wireless module 12 transmits the FHS packet from the transmission processing unit 120 by frequency hopping at the frequency of the inquiry response sequence (32 channel or 16 channel hopping).

  The reason why the wireless module 12 does not transmit the FHS packet simultaneously with the reception of the IQ packet is to prevent the FHS packet transmitted from each wireless module from colliding.

  Further, the wireless module 13 returns an FHS packet at the frequency f (k + 1) to another IQ packet transmitted at the frequency f (k + 1), so that the wireless module 11 receives the FHS packet from the wireless modules 12 and 13. Is received (see step 3).

  In the present invention, the specified time of inquiry state (Inquiry_Interval and Inquiry_Length) and the specified time of inquiry response state (Inquiry_Scan_Interval and Inquiry_Scan_Window) are set to 1 to 1 shorter than the time recommended in the Bluetooth standard. Acquires information about the proximity wireless module about once per second.

  FIG. 7 is a diagram illustrating the relationship between the received signal strength and the distance. In FIG. 7, the vertical axis represents the received signal strength RSSI, and the horizontal axis represents the distance.

  In FIG. 7, curve k1 shows the relationship between the received signal strength RSSI and the distance between the two wireless modules. The received signal strength RSSI decreases as the distance increases. The microcomputer 210 of each of the embedded CPU 21, PDA 22 and terminal devices 23 and 24 holds the curve k 1 shown in FIG. 7 as a map, and maps the distance corresponding to the received signal strength RSSI received from the protocol management unit 110. Extraction is made with reference to (curve k1), and it is determined whether or not the extracted distance is equal to or less than a reference value (= 3 m).

  Then, when the extracted distance is equal to or less than the reference value, the microcomputer 210 determines that the wireless module that has transmitted the FHS packet is a close proximity wireless module.

  As described above, the microcomputer 210 of each of the embedded CPU 21, the PDA 22, and the terminal devices 23, 24 has a wireless module that transmits the FHS packet and a wireless module that receives the FHS packet based on the received signal strength RSSI of the FHS packet. When the detected distance is equal to or less than the reference value, the wireless module that has transmitted the FHS packet is determined as the proximity wireless module.

  Note that the microcomputer 210 of each of the embedded CPU 21, PDA 22, and terminal devices 23 and 24 transmits the FHS packet when the distance extracted with reference to the map (curve k1) is substantially constant for a certain period of time. The module may be determined as a proximity wireless module.

  If the extracted distance changes over time, “the person carrying the wireless module 11 simply passed the person carrying the wireless module 12 determined to be the proximity wireless module of the wireless module 11”. Therefore, when the person carrying the wireless module 11 certainly talks with the person carrying the wireless module 12, the extracted distance is determined for a certain period of time in order to determine the wireless module 12 as a proximity wireless module. In this case, the wireless module that has transmitted the FHS packet is determined to be the close proximity wireless module when it is substantially constant.

  FIG. 8 is a view showing a correspondence table between addresses of wireless modules and names of persons working at medical institutions (= owner names). The correspondence table 50 includes an address and a name (= owner name or installation location name). The address includes addresses BD_Address1 to BD_Address4 of the wireless modules 11 to 14, and the name (= owner name or installation location name) includes doctor A, nurse B, hospital room C, and nurse center D.

  The names doctor A, nurse B, hospital room C, and nurse center D are associated with addresses BD_Address1 to BD_Address4, respectively. The doctor A carries the wireless module 11 having the address BD_Address1, and the nurse B carries the wireless module 12 having the address BD_Address2. In the hospital room C, the wireless module 13 having the address BD_Address3 is installed, and in the nurse center D, the wireless module 14 having the address BD_Address4 is installed.

  Therefore, by referring to the correspondence table 50, it is possible to detect who is carrying which wireless module or where which wireless module is installed.

  The microcomputer 210 of each of the embedded CPU 21, the PDA 22, and the terminal devices 23 and 24 has a correspondence table 50 shown in FIG.

  FIG. 9 is a diagram illustrating a history table held by each of the embedded CPU 21, the PDA 22, and the terminal devices 23 and 24. The history table 60 includes time, address, name (= owner name or installation location name), distance, and on / off signals of the microphones 31 and 32 of the history table 60. The time, address, name (= owner name or installation location name), distance, and on / off signal are associated with each other.

  However, when the name is an installation location name, the time, address, name, and distance are associated with each other, and the ON / OFF signal fields of the microphones 31 and 32 are left blank.

  The time is in the format of YYYY / MM / DD / HH / MM / SS / DS and represents the time when the distance is detected. The time component DS indicates a range of 1/10 second.

  The address stores the addresses BD_Address1 to BD_Address4 of the wireless modules 11 to 14 described above. The name (= owner name or installation location name) stores doctor A, nurse B, hospital room C, nurse center D, and the like. Among the distances extracted by the built-in CPU 21, the PDA 22 and the microcomputer 210 of the terminal devices 23 and 24, the distances L1, L2,... Within the reference value (= 3 m) are stored in the distance. An ON signal or an OFF signal from the own microphones 31 and 32 is stored in the on / off signal.

  When the embedded CPU 21, the PDA 22, and the microcomputer 210 of the terminal device 23, 24 detect the distance L1 by the above-described method based on the received signal strength RSSI1 received from the protocol management unit 110 of the corresponding wireless module 11-14. The time YYYY / MM / DD / HH / MM / SS / DS1 is detected based on a timer (not shown).

  Then, the embedded CPU 21, the PDA 22, and the microcomputer 210 of the terminal devices 23 and 24 extract the name (nurse B) corresponding to the address BD_Address 2 received from the protocol management unit 110 with reference to the correspondence table 50.

  Then, the embedded CPU 21, the PDA 22, and the microcomputer 210 of the terminal device 23, 24 send the time YYYY / MM / DD / HH / MM / SS / DS1, the address BD_Address1, the name (nurse B), the distance L1 and the ON signal. The association, the associated time YYYY / MM / DD / HH / MM / SS / DS1, address BD_Address1, name (nurse B), distance L1, and ON signal are stored in the history table 60 as history information.

  In addition, the embedded CPU 21, the PDA 22, and the microcomputer 210 of the terminal device 23, 24 detect the distance L2 by the above-described method based on the received signal strength RSSI2 received from the protocol management unit 110 of the corresponding wireless module 11-14. The time YYYY / MM / DD / HH / MM / SS / DS2 is detected based on a timer (not shown).

  Then, the embedded CPU 21, the PDA 22, and the microcomputer 210 of the terminal device 23, 24 extract the name (patient room C) corresponding to the address BD_Address 3 received from the protocol management unit 110 with reference to the correspondence table 50.

  Then, the embedded CPU 21, the PDA 22, and the microcomputer 210 of the terminal device 23, 24 associate the time YYYY / MM / DD / HH / MM / SS / DS2, the address BD_Address3, the name (patient room C), and the distance L2, and The associated time YYYY / MM / DD / HH / MM / SS / DS2, address BD_Address3, name (patient room C), and distance L2 are stored in the history table 60 as history information.

  Thus, when the proximity wireless module is the wireless module 13 installed in the patient room C, the column of the on / off signal of its own microphone is left blank.

  The embedded CPU 21, PDA 22, and microcomputers 210 of the terminal devices 23, 24 store the history information sequentially by repeating the above-described operation every time the address BD_Address and the received signal strength RSSI are received from the protocol management unit 110. Create Then, the embedded CPU 21, the PDA 22, and the microcomputer 210 of the terminal devices 23 and 24 store the created history table 60 in the storage device 220.

  Then, the embedded CPU 21, the PDA 22, and the microcomputer 210 of the terminal device 23, 24 periodically read the history table 60 from the storage device 220 and transmits the read history table 60 to the server 30 via the cable 40.

  When the server 30 receives the history table 60 from the embedded CPU 21, the PDA 22, and the terminal devices 23 and 24, the server 30 creates a history table indicating the history of each of the wireless modules 11 to 14.

  FIG. 10 is a configuration diagram of a history table created by the server 30. The history table 70 includes addresses 1 and 2, time, and on / off signals of the microphones 31 and 32. The address 1 is composed of addresses BD_Address of the wireless modules 11 to 14 corresponding to the embedded CPU 21, the PDA 22 and the terminal devices 23 and 24 that have transmitted the history table 60 to the server 30.

  The address 2 is composed of an address BD_Address of a close proximity wireless module adjacent to the wireless modules 11 to 14. More specifically, the address 2 includes the address BD_Address of the proximity wireless module extracted from the history table 60 received by the server 30 from the embedded CPU 21, PDA 22, and terminal devices 23 and 24.

  The time includes time YYYY / MM / DD / HH / MM / SS / DS of the close proximity wireless module included in the history table 60 received by the server 30 from the embedded CPU 21, PDA 22, and terminal devices 23, 24.

  Further, the on / off signal includes an on / off signal included in the history table 60 received by the server 30 from the embedded CPU 21 and the PDA 22, and stores an ON signal or an OFF signal.

  The server 30 receives the history table 60 shown in FIG. 9 from the microcomputer 210 of the embedded CPU 21 corresponding to the wireless module 11 (address BD_Address1) via the cable 40.

  Then, based on the received history table 60, the server 30 extracts addresses BD_Address2 and BD_Address3 of the close proximity wireless module adjacent to the wireless module 11. Further, the server 30 obtains the time t1 to t5 when the wireless module 12 having the address BD_Address2 is detected as a close proximity wireless module close to the wireless module 11, and the on / off signals of the microphones 31 and 32 at the time t1 to t5. Extracted from the history table 60.

  Further, the server 30 extracts from the history table 60 times t4 to t8 when the wireless module 13 having the address BD_Address3 is detected as a proximity wireless module close to the wireless module 11.

  Then, the server 30 determines whether the wireless module 11 (address BD_Address1) and the wireless module 12 (address BD_Address2) are based on the on / off signals of the microphones 31 and 32 at the extracted address BD_Address2, time t1 to t5, and time t1 to t5. The history information is stored in the history table 70.

  Further, the server 30 stores history information between the wireless module 11 (address BD_Address1) and the wireless module 13 (address BD_Address3) in the history table 70 based on the extracted address BD_Address3 and times t4 to t8.

  Based on the history table 60 received from the PDA 22 and the terminal devices 23 and 24, the server 30 stores the history information according to the same operation as described above and creates the history table 70.

  FIG. 11 is a flowchart for explaining the operation of detecting the close proximity wireless module. When a series of operations is started, each of the wireless modules 11 to 14 broadcasts an inquiry signal (IQ packet) according to the above-described operation (step S1). Then, each of the wireless modules 11 to 14 determines whether or not a response signal (FHS packet) to the inquiry signal (IQ packet) is received from another wireless module within a certain time (for example, 600 msec) (step S2). . When each of the wireless modules 11 to 14 does not receive a response signal (FHS packet) from another wireless module within a certain time, the series of operations ends.

  On the other hand, if each of the wireless modules 11 to 14 determines that the response signal (FHS packet) has been received within a predetermined time, the wireless module 11 to 14 detects the received signal strength RSSI of the response signal (FHS packet) (step S3).

  Further, the wireless modules 11 to 14 detect the address BD_Address of the wireless module that has transmitted the FHS packet from the FHS packet (step S4).

  Thereafter, each of the wireless modules 11 to 14 transmits the detected received signal strength RSSI and address BD_Address to the corresponding embedded CPU 21, PDA 22, and terminal devices 23 and 24 (step S5).

  When each wireless module 11-14 receives a plurality of response signals (a plurality of FHS packets) from a plurality of other wireless modules within a predetermined time in step S2, a plurality of response signals (a plurality of response signals) are received in step S3. A plurality of received signal strengths RSSI corresponding to a plurality of response signals (a plurality of FHS packets) are detected in step S4, and a plurality of received signal strengths RSSI are detected in step S5. The plurality of addresses B_Address are associated with each other and transmitted to the embedded CPU 21, PDA 22, and terminal devices 23 and 24 to which they are connected.

  The embedded CPU 21, the PDA 22, and the microcomputer 210 of the terminal device 23, 24 receive the received signal strength RSSI and the address BD_Address from the corresponding wireless modules 11 to 14, and receive the received signal strength RSSI and the address BD_Address. Detect time.

  Further, the embedded CPU 21, the PDA 22, and the microcomputer 210 of the terminal devices 23 and 24, based on the received signal strength RSSI, and the wireless module that transmitted the FHS packet and the corresponding wireless module (the wireless modules 11 to 14). The distance L between them is detected with reference to the map (curve k1) (step S6), and it is determined whether or not the detected distance L is equal to or less than a reference value (step S7).

  When the detected distance L is not less than or equal to the reference value, the embedded CPU 21, the PDA 22, and the microcomputer 210 of the terminal devices 23 and 24 discard the detected distance L (step S8). Thereafter, the series of operations ends.

  On the other hand, if it is determined in step S7 that the detected distance L is equal to or less than the reference value, the embedded CPU 21, the PDA 22, and the microcomputers 210 of the terminal devices 23, 24 receive the addresses received from the corresponding wireless modules 11-14. A name (= owner name or installation location name) corresponding to BD_Address is extracted with reference to the correspondence table 50 (step S9).

  Thereafter, the embedded CPU 21, PDA 22, and microcomputer 210 of the terminal devices 23 and 24, the history information in which the time, address BD_Address, name (= owner name or installation location name), distance L, and on / off signal are associated with each other. (Step S10), a history table 60 including the created history information is created, and the created history table 60 is stored in the storage device 220 (step S11).

  Then, the embedded CPU 21, the PDA 22, and the microcomputer 210 of the terminal devices 23 and 24 periodically read the history information from the storage device 220 and transmit it to the server 30 (step S12), and register the history information in the server 30 ( Step S13). Then, the server 30 creates the history table 70 by the above-described operation (step S14).

  Thereby, a series of operation | movement is complete | finished.

  Note that the flowchart shown in FIG. 11 is always executed, and each of the wireless modules 11 to 14 detects its own proximity wireless module and creates the history table 60. Therefore, the inquiry signal (IQ packet) is transmitted (broadcast) at an arbitrary timing.

  In the above description, the fixed time in step S2 is set to 600 msec. However, the present invention is not limited to this, and the fixed time is generally set to several hundred msec. In the conventional Bluetooth standard, the fixed time for receiving the response signal (FHS packet) is set to 1 minute. However, as in the present invention, by setting the fixed time to several hundred msec, each wireless module 11 is set. -14 are capable of quickly detecting a proximity wireless module, and a wireless module that transmits an inquiry signal (IQ packet) and a wireless module that receives a response signal (FHS packet) frequently change, and a plurality of wireless modules The mutual exchange of information can be activated.

  Next, a method for utilizing the history table 70 created by the server 30 will be described. As described above, the server 30 creates the history table 70 shown in FIG. The doctor A carrying the wireless module 11 and the embedded CPU 21 inputs a history information output request to the embedded CPU 21, and the microcomputer 210 of the embedded CPU 21 responds to the history information output request from the doctor A. The output request in Table 70 is transmitted to the server 30.

  Then, the server 30 transmits the history table 70 to the embedded CPU 21 via the cable 40 in response to an output request for the history table 70 from the embedded CPU 21. The embedded CPU 21 receives the history table 70 from the server 30 and displays the history table 70 on the display unit 230.

  Then, the doctor A looks at the history table 70 and approaches the nurse B within the reference value (= 3.0 m) at the time t1 to t5, and is connected to the PDA 22 carried by the nurse B. Times t1, t2, t4, and t5 when the microphone 32 is turned on and a time t3 when the microphone 32 is turned off are detected.

  The doctor A looks at the history table 70 and approaches the wireless module 13 installed in the room C from time t4 to t8 within the reference value (= 3.0 m), that is, enters the room C. Is detected.

  As a result, doctor A detects that he / she talked with nurse B in hospital room C at times t4 and t5.

  Then, doctor A is talking to nurse B in patient room C at times t4 and t5, and talks to nurse B when administering the drug to the patient, and makes sure that nurse B is administered the drug. Detects that it is instructing.

  Thus, according to the flowchart shown in FIG. 11, each wireless module 11-14 detects a proximity wireless module close to itself, creates a history table 60 including history information of the detected proximity wireless module, and creates By registering the history table 60 in the server 30, a person (doctor A or the like) carrying each of the wireless modules 11 and 12 can detect his / her behavior history by looking at the server 30 and also a nurse regarding drug administration. Can be detected. As a result, even if a medical error occurs, the cause of the medical error can be easily detected by referring to the history table 70.

  As described above, the history information included in the history table 70 is used to search for action histories of persons belonging to a predetermined group (such as doctor A and nurse B).

  As described above, by collectively managing the information (address BD_Address and distance L) regarding the proximity wireless module by the server 30, it is possible to easily detect when and with whom a member of a certain group has acted.

  As described above, since the wireless modules 13 and 14 are installed in a hospital room, if the wireless modules 13 and 14 are detected as the proximity wireless modules of the wireless modules 11 and 12, the wireless modules 11 and 12 are installed. It can be confirmed that the doctor A or the like who has carried the mobile phone has gone to the room where the wireless modules 13 and 14 are installed.

  That is, it is possible to easily detect who (= which wireless module) is at what time and where.

  Furthermore, in the present invention, a person other than the doctor A who carries the wireless modules 11 and 12 included in the communication system 100, for example, an office worker, can also view the history table 70 of the server 30. In this case, the clerk accesses the server 30 using the terminal devices 23 and 24 installed in the hospital room, receives the history table 70 from the server 30, and displays the history table 70 on the display unit 230. Then, the clerk looks at the history table 70.

  Thereby, people other than the predetermined group using the communication system 100 can also search for the behavior of the members of the group.

  Further, in the above description, the communication system 100 is described as being disposed in a medical institution. However, the present invention is not limited thereto, and the communication system 100 is installed in an organization that performs duties in groups such as a police station, a factory, and a fire station. Is done.

  Furthermore, in the above description, it has been described that the relationship between the received signal strength RSSI and the distance L is held as a map (curve k1). However, in the present invention, this map may be updated periodically. Since the radio wave environment changes with time, a map showing the relationship between the received signal strength RSSI and the distance L suitable for the radio wave environment is used in order to accurately detect a close proximity wireless module existing at a distance equal to or less than the reference value. It is necessary.

  Furthermore, in the above description, the distance reference value for determining whether or not the wireless module is a close proximity wireless module is 3 m. However, in the present invention, the distance reference value is not limited to this and is a numerical value other than 3 m. There may be.

  Furthermore, in the above, the embedded CPU 21, the PDA 22, and the microcomputer 210 of the terminal devices 23 and 24 refer to the map (curve k1) showing the relationship between the received signal strength RSSI and the distance L, and each received signal strength RSSI. In the present invention, the microcomputer 210 of the embedded CPU 21, the PDA 22, and the terminal devices 23 and 24 may detect the distance L by the following equation. Good.

P r = P t G t G r [D d {λ / (4πr d )} + D r {λ / (4πr r )} Γexp [−j {k (r d −r r ) + φ}]] 2.・ (1)
However, P r: received power, P t: transmission power, G r: gain of the receiving antenna, G t: gain of the transmitting antenna, D d: directional gain of the transmission and reception of the direct wave antenna, D r: transmission and reception of the indirect waves Directivity gain of antenna, r d : propagation distance of direct wave, r r : propagation distance of indirect wave, k = 2π / λ, λ: wavelength of radio wave, Γ: reflection coefficient of floor and wall inside building, Φ FIG. 12 is a diagram showing the relationship between the absolute value of the reflection coefficient | Γ | and the phase delay Φ and the incident angle θi. In FIG. 12, the vertical axis represents the absolute value | Γ | of the reflection coefficient and the phase delay Φ, and the horizontal axis represents the incident angle θi. A curve k2 shows the relationship between the absolute value | Γ | of the reflection coefficient in the vertically polarized wave and the incident angle θi, and a curve k3 shows the relationship between the phase delay Φ and the incident angle θi in the vertically polarized wave. A curve k4 shows the relationship between the absolute value | Γ | of the reflection coefficient in the horizontally polarized wave and the incident angle θi, and a curve k5 shows the relationship between the phase delay Φ in the horizontally polarized wave and the incident angle θi.

  The incident angle θi is an angle when an electric wave radiated from the antenna 11A of each wireless module 11-14 enters the floor (an angle with respect to the normal direction of the floor), and from the floor of the antenna 11A in the wireless module 11-14. Determined by the height of The incident angle θi is relatively small when the height from the floor of the antenna 11A in the wireless modules 11 to 14 is relatively high, and the height from the floor of the antenna 11A in the wireless modules 11 to 14 is high. If it is relatively low, it becomes relatively large.

Therefore, when the incident angle θi is determined, the absolute value | Γ | of the reflection coefficient in the vertical polarization and the horizontal polarization and the phase delay Φ are determined using the curves k2 to k5 shown in FIG. Also, transmission power P t , receiving antenna gain G r , transmitting antenna gain G t , direct wave transmitting / receiving antenna directivity gain D d , indirect wave transmitting / receiving antenna directivity gain D r , k = 2π / λ And the wavelength λ of the radio wave are known, the protocol management unit 110 of each of the wireless modules 11 to 14 determines the absolute value of the reflection coefficient | Γ |, the phase delay Φ, the transmission power P t , and the gain G r of the receiving antenna. , The transmission antenna gain G t , the direct wave transmission / reception antenna directivity gain D d , the indirect wave transmission / reception antenna directivity gain D r , k = 2π / λ, and the radio wave wavelength λ are substituted into equation (1). and calculates the propagation distance r d of the direct wave as the distance L and to detect the proximity wireless module determines whether or not the calculated propagation distance r d is less than the reference value.

  The embedded CPU 21 and the PDA 22 constitute a “terminal device”.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and is intended to include meanings equivalent to the scope of claims for patent and all modifications within the scope.

  The present invention is applied to a communication system including a wireless module that can reduce the burden on a microcomputer and can detect other adjacent units.

1 is a schematic diagram of a communication system according to an embodiment of the present invention. It is a functional block diagram of the radio | wireless module and embedded CPU shown in FIG. It is a conceptual diagram which shows the connection of the radio | wireless module shown in FIG. 1, and embedded CPU. It is a figure which shows the various states in Bluetooth specification. It is a conceptual diagram for demonstrating an inquiry state in detail. It is a timing chart for demonstrating the operation | movement of an inquiry. It is a figure which shows the relationship between received signal strength and distance. It is a figure which shows the conversion table of the address of a wireless module, and the name of the person who works in a medical institution. It is a figure which shows the history table which each embedded CPU, PDA, and a terminal device hold | maintain. It is a block diagram of the history table which a server produces. It is a flowchart for demonstrating the operation | movement which detects a proximity | contact proximity wireless module. It is a figure which shows the relationship between the absolute value of a reflection coefficient, a phase delay, and an incident angle.

Explanation of symbols

  11-14 wireless module, 20 mobile unit, 21 embedded CPU, 22 PDA, 23, 24 terminal device, 30 server, 31, 32 microphone, 40 cable, 41 RS232C, 50 correspondence table, 60, 70 history table, 100 communication System, 110 protocol management unit, 120 transmission processing unit, 130 wireless unit, 140 reception processing unit, 210 microcomputer, 220 storage device, 230 display unit.

Claims (5)

  1. A communication system for detecting a wireless module existing within a certain distance from one wireless module,
    A plurality of wireless modules capable of wireless communication with each other;
    A plurality of terminal devices provided corresponding to the plurality of wireless modules, each of which controls a corresponding wireless module and detects a nearby wireless module existing within a certain distance from the corresponding wireless module;
    Each of the plurality of wireless modules is a first code that is an access code common to all wireless modules or a second access code that is common to a group of specific wireless modules in accordance with control from the corresponding terminal device . And continuously generating a plurality of inquiry signals for inquiring about the presence of the proximity wireless module, sequentially transmitting the generated plurality of inquiry signals to the surroundings by the wireless communication, and the inquiry A response signal to the signal is received from another wireless module by the wireless communication, and the received signal strength of the received response signal is detected;
    Each of the plurality of terminal devices detects a distance between the corresponding wireless module and the other wireless module based on the received signal strength detected by the corresponding wireless module, and the detected distance is a reference value Determining the other wireless module as the proximity wireless module when:
    When the other wireless module receives the inquiry signal, the other wireless module waits for an arbitrary number of frames, receives the same inquiry signal as the received inquiry signal again, and then transmits the response signal.
  2.   The communication system according to claim 1, wherein each of the plurality of terminal devices determines the other wireless module as the close proximity wireless module when the detected distance is substantially constant for a certain time.
  3.   Each of the plurality of terminal devices holds a map indicating a relationship between the received signal strength and the distance, and extracts a distance corresponding to the received signal strength of the received received signal with reference to the map. The communication system according to claim 1, wherein the extracted distance is detected as a distance between the self and the other wireless module.
  4.   When each of the plurality of terminal devices receives the address of the other wireless module determined to be the proximity wireless module from the corresponding wireless module, the owner name of the other wireless module determined to be the proximity wireless module or The installation location name, the distance, and the address are associated with each other, and the associated owner name or installation location name, distance, and address are stored in the storage unit as history information. The communication system according to item 1.
  5. Each of the plurality of terminal devices holds a correspondence table in which a plurality of addresses of the plurality of wireless modules and a plurality of owner names of the plurality of wireless modules are associated with each other. , The owner name or installation location name corresponding to the received address is extracted with reference to the correspondence table, and the history information is associated with the extracted owner name or installation location name in association with the address and the distance. The communication system according to claim 4, wherein the created history information is stored in the storage means.
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JP5181833B2 (en) * 2008-05-26 2013-04-10 株式会社ナカヨ通信機 Mobile wireless terminal with meeting support function
CN104022803B (en) * 2013-02-28 2017-08-25 原相科技股份有限公司 The method of communication protocol system and its automatic updating data

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