JP2017022556A - Communication device and communication method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain radio equipment capable of acquiring high communication quality, by attributing a radio terminal device to an optimal access point, in a radio communication system which includes a plurality of access points.SOLUTION: The radio equipment includes radio communication means 1, sharing information preservation means 2, information sharing means 3, determination means 4 and attribution response means 5. The communication means 1 performs radio communication with the radio terminal device. The sharing information preservation means 2 preserves, on receiving an attribution request from the radio terminal device, the radio signal strength of the radio terminal device received by the self-device and identification information in an associative manner, as first sharing information. The information sharing means 3 acquires second sharing information, in which the radio signal strength of a radio terminal device received in another device and identification information are associated, to add to the first sharing information. Based on the first sharing information, the determination means 4 determines an optimal attribution destination of the radio terminal device. When the optimal attribution destination is the self-device, the attribution response means 5 transmits an attribution response to the radio terminal device.SELECTED DRAWING: Figure 1

Description

  The present invention particularly relates to a wireless device, and particularly relates to the attribution of a wireless terminal device to a wireless device as a wireless access point.

  Various devices such as an information processing device, its peripheral devices, and a video display device exhibit high functionality by transmitting and receiving data to and from other devices or the Internet via a network. When an information processing device or the like is used as a wireless terminal device, these devices are installed in various places and are carried and used. For this reason, wireless LAN (Local Area Network) systems are widely used in homes and small offices in order to improve the degree of freedom of installation and carrying.

  Since communication is performed in various places such as a home, a plurality of wireless LAN access points are often provided even in a relatively small wireless LAN system such as a home. By providing a plurality of wireless LAN access points, an area where wireless communication can be performed stably is expanded. On the other hand, when a plurality of wireless LAN access points are provided, each wireless terminal device may be able to communicate with a plurality of wireless LAN access points.

  For example, it is assumed that a plurality of wireless LAN access points having the same SSID (Service Set IDentifier) are installed to enable roaming in a living room and a bedroom in the home. In such an environment, when a user uses a wireless LAN slave device such as a smartphone, that is, a wireless terminal device in a living room, the wireless terminal device belongs to a wireless LAN access point installed in the living room. However, it is possible that the wireless terminal device belongs to a wireless LAN access point installed in a distant bedroom.

  In such a case, the wireless terminal device has low radio wave strength and low communication quality even though a wireless LAN access point that has high radio wave strength nearby and high communication quality can be expected. There is a possibility of belonging to a wireless LAN access point. Therefore, in order to obtain high communication quality, it is necessary to assign each wireless terminal device to an optimum wireless LAN access point in an environment where there are a plurality of wireless LAN access points.

  From the background described above, in an environment where there are a plurality of wireless LAN access points, technology development has been carried out to ensure that wireless terminal devices belong to wireless LAN access points that are expected to have high communication quality. As a technique for connecting a wireless terminal device to a wireless LAN access point that is expected to have high communication quality in an environment having a plurality of wireless LAN access points, for example, a technique such as Patent Document 1 is disclosed. Yes.

  Patent Document 1 relates to a wireless communication system including a plurality of wireless access points and wireless terminal devices. The wireless access point of the wireless communication system of Patent Document 1 determines that the wireless terminal device is a roaming target when the signal from the wireless terminal device is equal to or lower than a threshold value. In Patent Document 1, identification information of a wireless terminal device that is a roaming target is shared between wireless access points. Each wireless access point in Patent Literature 1 transmits a predetermined signal to a wireless terminal device that is a roaming target. The wireless terminal device of Patent Literature 1 determines whether or not it is necessary to change the attribution destination based on the strength of the signal transmitted from each access pon-in. According to Patent Document 1, by determining the attribution destination of the wireless terminal device by such a method, even when the wireless communication environment is deteriorated, roaming can be performed and good wireless communication can be continued.

JP 2010-34745 A

  However, the technique of Patent Document 1 is not sufficient in the following points. In the wireless communication system of Patent Document 1, a wireless terminal device determines an optimal wireless access point as an attribution destination based on a signal from each wireless access point. For this reason, if wireless terminal devices having different criteria are present in the wireless communication system, the wireless terminal devices may affect each other's wireless communication, resulting in a decrease in communication quality. Therefore, in the wireless communication system of Patent Document 1, it is necessary that all wireless terminal devices used in the wireless communication system have a function of comparing the signals of the wireless access points based on the same reference and determining the belonging destination. is there.

  On the other hand, since various wireless terminal devices are used in the wireless LAN system, all wireless terminal devices may not have such a determination function based on the same standard. Therefore, the technique of Patent Document 1 is not sufficient as a technique for reliably associating a wireless terminal device with an optimal wireless LAN access point and obtaining high communication quality in a wireless communication system having a plurality of access points. .

  In order to solve the above-described problem, the present invention provides a wireless device capable of obtaining high communication quality by assigning a wireless terminal device to an optimal access point in a wireless communication system including a plurality of access points. It is aimed.

  In order to solve the above problems, the wireless device of the present invention includes wireless communication means, shared information storage means, information sharing means, determination means, and attribution response means. The communication means performs wireless communication with the wireless terminal device. The shared information storage means associates the strength of the wireless signal of the wireless terminal apparatus received via the wireless communication means with the identification information of the wireless terminal apparatus as the first shared information when receiving the attribution request from the wireless terminal apparatus. save. The information sharing means acquires information associating the wireless signal strength of the wireless terminal device received by the other device with the identification information of the wireless terminal device from the other device as second shared information, and acquires the acquired second shared information. Is added to the first shared information. The determining means determines an optimum attribution destination of the wireless terminal device based on the first shared information. The belonging response means transmits an belonging response to the wireless terminal device when the optimum belonging destination of the wireless terminal device is the own device.

  In the communication method of the present invention, when an attribution request is received from a wireless terminal device, the received wireless signal device's wireless signal strength is stored in association with the identification information of the wireless terminal device as first shared information. According to the communication method of the present invention, the information obtained by associating the strength of the wireless signal of the wireless terminal device received by the other device with the identification information of the wireless terminal device is acquired from the other device as the second shared information, and the acquired second The shared information is added to the first shared information. In the communication method of the present invention, the optimum destination of the wireless terminal device is determined based on the first shared information. The communication method of the present invention transmits an attribution response to the wireless terminal device when the optimal attribution destination of the wireless terminal device is the own device. The communication method of the present invention performs wireless communication with a wireless terminal device.

  ADVANTAGE OF THE INVENTION According to this invention, in a radio | wireless communications system provided with a some access point, a radio | wireless terminal apparatus can be attributed to an optimal access point, and high communication quality can be acquired.

It is a figure which shows the outline | summary of a structure of the 1st Embodiment of this invention. It is a figure which shows the outline | summary of a structure of the 2nd Embodiment of this invention. It is the figure which showed the outline | summary of the structure of the communication apparatus of the 2nd Embodiment of this invention. It is the figure which showed the outline | summary of the operation | movement flow of the 2nd Embodiment of this invention. It is the figure which showed the example of the data table of the 2nd Embodiment of this invention. It is the figure which showed the outline | summary of the operation | movement sequence of the 2nd Embodiment of this invention. It is the figure which showed the outline | summary of the operation | movement flow of the 3rd Embodiment of this invention. It is the figure which showed the example of the data table of the 3rd Embodiment of this invention. It is the figure which showed the outline | summary of the operation | movement flow of the 4th Embodiment of this invention. It is the figure which showed the outline | summary of the operation | movement sequence of the 4th Embodiment of this invention.

(First embodiment)
A first embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 shows an outline of the configuration of the wireless device of this embodiment. The wireless apparatus according to the present embodiment includes a wireless communication unit 1, a shared information storage unit 2, an information sharing unit 3, a determination unit 4, and an attribution response unit 5. The communication unit 1 performs wireless communication with the wireless terminal device. The shared information storage unit 2 associates the strength of the radio signal of the wireless terminal device received via the wireless communication unit 1 with the identification information of the wireless terminal device when receiving the attribution request from the wireless terminal device. Save as information. The information sharing means 3 acquires information associating the wireless signal strength of the wireless terminal device received by the other device with the identification information of the wireless terminal device as second shared information from the other device, and acquires the acquired second share. Information is added to the first shared information. The determination unit 4 determines an optimal attribution destination of the wireless terminal device based on the first shared information. The attribution response means 5 transmits an attribution response to the wireless terminal device when the optimum attribution destination of the wireless terminal device is the own device.

  The wireless device according to the present embodiment uses the first shared information based on the wireless signal strength of the wireless terminal device received by the device itself, and the second shared information based on the wireless signal strength of the wireless terminal device received by the other device. The first shared information to which the shared information is added is stored in the shared information storage unit 2. In the wireless device according to the present embodiment, the determination unit 4 determines the optimum attribution destination of the wireless terminal device based on the first shared information, and when the optimum attribution destination is the own device, the attribution response unit 5 An attribution response is transmitted to the wireless terminal device.

  By transmitting an attribution response to the wireless terminal device when the optimum attribution destination is the own device, the wireless terminal device can perform wireless communication belonging to the optimum attribution destination. Therefore, it can be avoided that the wireless terminal device belongs to a non-optimal wireless device, and high communication quality can be obtained in wireless communication. Further, in this embodiment, since the wireless device determines the attribution destination of the wireless terminal device, it is possible to determine the attribution destination without depending on the function and the determination criterion of the wireless terminal device.

  As a result, by providing the wireless device of this embodiment as a wireless access point, it is possible to obtain a high communication quality by assigning the wireless terminal device to the optimum access point in a wireless communication system including a plurality of access points.

(Second Embodiment)
A second embodiment of the present invention will be described in detail with reference to the drawings. FIG. 2 shows an outline of the configuration of the wireless communication system of the present embodiment. The wireless communication system of this embodiment includes a first wireless device 10, a second wireless device 20, and a wireless terminal device 30.

  The wireless communication system of the present embodiment is configured as a wireless LAN (Local Area Network) system. The first wireless device 10 and the second wireless device 20 are provided as wireless LAN access points. The first radio apparatus 10 is provided as a router. The second radio apparatus 20 is provided as a bridge converter. Three or more wireless devices may be provided as wireless LAN access points. The wireless terminal device 30 is provided as a wireless LAN slave device. A plurality of wireless terminal devices 30 may be provided.

  The first wireless device 10 and the second wireless device 20 have the same identification information. In the present embodiment, the first wireless device 10 and the second wireless device 20 have the same SSID (Service Set IDentifier) as the same identification information. The first wireless device 10 and the second wireless device 20 are connected to each other and can perform bidirectional data communication. Communication between the first wireless device 10 and the second wireless device 20 may be communication via a wired line or wireless communication. The first wireless device 10 is further connected to an external communication network.

  Wireless communication between the first wireless device 10 and the second wireless device 20 that are wireless LAN access points and the wireless terminal device 30 that is a wireless LAN slave device is performed in a frequency band of 2.4 GHz, for example. The radio communication frequency band may be another radio frequency band such as 5 Hz. Further, the frequency band for wireless communication between the first wireless device 10 and the second wireless device 20 and the wireless terminal device 30 may be selected from a plurality of frequency bands.

  The configurations of the first radio apparatus 10 and the second radio apparatus 20 will be described with reference to FIG. FIG. 3 shows an outline of the configuration of the wireless device 40 used as the first wireless device 10 and the second wireless device 20 in the present embodiment.

  As illustrated in FIG. 3, the wireless device 40 includes a communication unit 41, a communication control unit 42, a wireless communication unit 43, and a terminal management unit 44. The terminal management unit 44 further includes an attribution control unit 45, an optimum determination unit 46, a signal information sharing unit 47, and a shared information storage unit 48.

  The communication unit 41 has a function of communicating with other communication devices in the wireless LAN system and an external communication network. In the present embodiment, the communication unit 41 of the first wireless device 10 communicates with the second wireless device 20 that is another communication device and an external communication network. Further, the communication unit 41 of the second wireless device 20 communicates with the first wireless device 10 that is another communication device.

  The communication unit 41 converts signals received from other communication devices and an external communication network into signals of a format used inside the wireless device 40 and sends the signals to the communication control unit 42. The communication unit 41 converts signals transmitted from the communication control unit 42 to other communication devices and an external communication network into signals of a format based on the communication standard. The communication unit 41 transmits a signal converted into a format based on a communication standard to another wireless device or an external communication network.

  The communication unit 41 sends the received data to the communication control unit 42 when RSSI shared data, which is data shared with other wireless devices, is received from the other wireless devices. In addition, when the communication unit 41 receives RSSI shared data to be transmitted to another wireless device from the communication control unit 42, the communication unit 41 broadcasts the received data to another wireless device in the wireless communication system.

  The RSSI shared data refers to data in which the identification information of the wireless terminal device 30, the strength of the radio signal received from the wireless terminal device 30, and the identification information of the own device are associated with each other. In this embodiment, each MAC (Media Access Control) address is used for the identification information of the wireless terminal device 30 and its own device. Further, an RSSI (Received Signal Strength Indication) value is used as the strength of the radio signal of the radio terminal device 30. If the radio | wireless apparatus 40 produces | generates RSSI shared data as 1st shared information by an own apparatus, it will transmit the 1st shared information, ie, the RSSI shared data produced | generated by the own apparatus, to another apparatus. Further, when the RSSI shared data generated based on the wireless signal strength of the wireless terminal device 30 received by the other device is received as the second shared information, the second shared information is added to the first shared information. That is, each wireless device 40 generates RSSI shared data obtained by adding RSSI shared data generated by another device to RSSI shared data generated by itself. As a result, each wireless device 40 can have RSSI shared data common to each other.

  The communication control unit 42 has a function of performing overall control of the wireless device 40. The communication control unit 42 determines a destination of a data signal received from another wireless device, the wireless terminal device 30 and an external communication network, and transfers the data signal to a transmission destination corresponding to the destination. Further, when detecting the signal indicating the attribution request sent from the wireless terminal device 30, the communication control unit 42 sends the attribution request information to the attribution control unit 45 of the terminal management unit 44 as a terminal management unit control signal S41.

  The communication control unit 42 sends the attribution request information, the identification information of the wireless terminal device 30 and the strength information of the wireless signal received from the wireless terminal device 30 to the attribution control unit 45 as a terminal management unit control signal S41. In the present embodiment, the MAC address of the wireless terminal device 30 is used for the identification information of the wireless terminal device 30. Further, the RSSI value (of the radio signal) is used for the information on the strength of the radio signal received from the radio terminal device 30.

  The communication control unit 42 transmits other RSSI shared data, which is data shared with other wireless devices transmitted from the belonging control unit 45 of the terminal management unit 44 as the terminal management unit response signal S42, via the communication unit 41. To the wireless device. Upon receiving RSSI shared data from another wireless device, the communication control unit 42 sends the received data to the belonging control unit 45 of the terminal management unit 44 as a terminal management unit control signal S41.

  Further, when the communication control unit 42 receives, as the terminal management unit response signal S42, information on the attribution response indicating that the own device has been selected as the attribution destination of the wireless terminal device 30, from the attribution control unit 45 of the terminal management unit 44. Then, the data is transmitted to the wireless terminal device 30 via the wireless communication unit 43.

  The wireless communication unit 43 has a function of performing wireless communication with the wireless terminal device 30. The wireless communication unit 43 converts the wireless signal received from the wireless terminal device 30 into a signal format used inside the wireless device 40 and sends the signal to the communication control unit 42. In addition, the wireless communication unit 43 converts the data received from the communication control unit 42 into a wireless signal and sends it to the wireless terminal device 30. The wireless communication unit 43 transmits a beacon for communication control to the wireless terminal device 30 and the like. When the wireless communication unit 43 receives a wireless signal, the wireless communication unit 43 sends information on the strength of the wireless signal to the communication control unit 42. The wireless communication unit 43 corresponds to the wireless communication unit 1 of the first embodiment.

  The terminal management unit 44 has a function of determining the attribution destination of the wireless terminal device 30 and a function of managing RSSI shared data used for the determination.

  The attribution control unit 45 has a function of controlling the operation when determining the attribution destination of the wireless terminal device 30. When the attribution control unit 45 receives the attribution request information from the communication control unit 42 as the terminal management unit control signal S41, the attribution control unit 45 starts an operation relating to determination of the attribution destination of the wireless communication terminal device 30.

  When the operation related to the determination of the attribution destination is started, the attribution control unit 45 determines the information requesting the determination of the attribution destination of the wireless terminal device 30 and the information of the MAC address that is the identification information of the wireless terminal device 30 from the determination unit control signal S43. To the optimum judgment unit 46. In addition, the attribution control unit 45 sends an RSSI value, which is information on the strength of the wireless signal sent from the wireless terminal device 30, to the signal information sharing unit 47 as a signal strength signal S45. The attribution control unit 46 corresponds to the attribution response unit 5 of the first embodiment.

  When the attribution control unit 45 receives the RSSI shared data transmitted from another wireless device as the terminal management unit control signal S41 from the communication control unit 42, the attribution control unit 45 transmits the received data to the optimum determination unit 46 as the determination unit control signal S43. . In addition, when the attribution control unit 45 receives RSSI shared data to be transmitted to another wireless device as the attribution control response signal S44 from the optimum determination unit 46, it transmits the received data to the communication control unit 42 as the terminal management unit response signal S42. .

  When the attribution control unit 45 receives the attribution control response signal S44 indicating that the own device is the optimum attribution destination of the wireless terminal device 30 from the optimum determination unit 46, the attribution control unit 45 generates attribution response information, and assigns the attribution response information. It sends to the communication control unit 42 as a terminal management unit response signal S42.

  The optimal determination unit 46 has a function of determining an optimal attribution destination of the wireless terminal device 30. The optimum determination unit 46 determines the attribution destination of the wireless terminal device 30 in response to the attribution request from the wireless terminal device 30. When receiving the attribution request as the judgment unit control signal S43 from the attribution control unit 45, the optimum judgment unit 46 starts judging the attribution destination.

  When determining the attribution destination, the optimum determination unit 46 sends a request to collect information such as the strength of the radio signal to the signal information sharing unit 47 as the information sharing unit control signal S46. The optimum determination unit 46 determines the attribution destination of the wireless terminal device 30 based on RSSI shared data that is information such as the strength of the wireless signal transmitted from the signal information sharing unit 47 as the shared information signal S47.

  When selecting the own device as the belonging destination of the wireless terminal device 30, the optimum determining unit 46 sends information indicating that the own device is the optimum belonging destination to the belonging control unit 45 as an belonging control response signal S44. In the wireless communication system according to the present embodiment, the optimum determination unit 46 determines which of the first wireless device 10 and the second wireless device 20 is suitable as an attribution destination of the wireless terminal device 30.

  The optimum determination unit 46 sends the RSSI shared data of the own device generated by the signal sharing unit 47 to the belonging control unit 45 as an belonging control response signal S44 in order to transmit to other wireless devices. Further, the optimum determination unit 46 sends the RSSI shared data of the other wireless device received from the belonging control unit 45 to the signal information sharing unit 47 as an information sharing unit control signal S46. The optimum determination unit 46 corresponds to the determination unit 4 of the first embodiment.

  The signal information sharing unit 47 has a function of managing information related to the strength of the radio signal. The signal information sharing unit 47 stores the RSSI value in the shared information storage unit 48 when receiving the RSSI value information, which is information on the strength of the radio signal, as the signal strength information S 45 from the attribution control unit 45. The signal information sharing unit 47 associates the information related to the strength of the radio signal with the RSSI value, which is the strength of the radio signal, the MAC address of the own device, and the MAC address of the wireless terminal device 30 as RSSI shared data in the shared information storage unit 44 save.

  The signal information sharing unit 47 stores, in the shared information storage unit 48, the RSSI shared data generated by another wireless device transmitted from the optimum determination unit 46 as the information sharing unit control signal S46. The signal information sharing unit 47 corresponds to the information sharing unit 3 of the first embodiment.

  The shared information storage unit 48 has a function of storing RSSI shared data as information related to the strength of the radio signal. The shared information storage unit 48 stores the RSSI value, the MAC address of the own device, and the MAC address information of the wireless terminal device 30 as RSSI shared data. Further, the shared information storage unit 48 of the present embodiment corresponds to the shared information storage unit 2 of the first embodiment.

  The wireless terminal device 30 has a function of performing wireless communication with the first communication device 10 and the second communication device 20. As the wireless terminal device 30, for example, a smartphone or a tablet information terminal with a wireless LAN communication function is used. The wireless terminal device 30 may be an information processing device with a wireless LAN communication function, a peripheral device of the information processing device, a video display device, a household electric device, or the like. Further, the wireless terminal device 30 may be provided as an NIC (Network Interface Card) in an information processing device, a peripheral device of the information processing device, a video display device, a household electrical device, or the like.

  The wireless terminal device 30 of the present embodiment wirelessly transmits an attribution request, establishes a connection with the wireless device that has responded with the attribution response, and performs data communication or the like. That is, the wireless terminal device 30 of the present embodiment performs wireless communication by belonging to the wireless device that is the transmission source of the belonging response among the first wireless device 10 and the second wireless device 20.

  In the wireless communication system according to the present embodiment, an operation when either the first wireless device 10 or the second wireless device 20 is determined as an attribution destination of the wireless terminal device 30 will be described. FIG. 4 shows an outline of an operation flow when the attribution destination of the wireless terminal device 30 is determined in the wireless communication system of the present embodiment.

  When the wireless terminal device 30 starts operating in the wireless communication system, the wireless terminal device 30 transmits an attribution request signal by broadcasting. When the attribution request signal is transmitted from the wireless terminal device 30, the first wireless device 10 and the second wireless device 20 each receive the attribution request signal (step 101).

  When receiving the attribution request signal, the wireless communication unit 43 of the first wireless device 10 and the second wireless device 20 sends the received signal to the communication control unit 42. When detecting that the received signal is an attribution request signal, the communication control unit 42 sends the attribution request signal to the attribution control unit 45 of the terminal management unit 44 as a terminal management unit control signal S41.

  Upon receiving the terminal management unit control signal S41 indicating the attribution request information, the attribution control unit 45 starts an attribution destination determination process for the communication terminal device 30 (step 102). Upon receiving the terminal management unit control signal S41 indicating the attribution request information, the attribution control unit 45 sends the attribution request information to the optimum determination unit 46 as the determination unit control signal S43. When receiving the determination unit control signal S43 indicating the attribution request information, the optimum determination unit 46 sends a signal requesting generation of RSSI shared information to the signal information sharing unit 47 as the information sharing unit control signal S46.

  When the attribution control unit 45 sends a judgment unit control signal S43 indicating an attribution request to the optimum judgment unit 46, the attribution control unit 45 sends information on the strength of the radio signal to the signal information sharing unit 47 as a signal strength signal S45. The attribution control unit 45 sends the strength of the radio signal transmitted from the wireless terminal device 30 received via the communication control unit 43, that is, the RSSI value to the signal information sharing unit 47.

  When the signal information sharing unit 47 receives the information sharing unit control signal S46 and the signal strength signal S45 and acquires an RSSI value or the like (step 103), the signal information sharing unit 47 generates RSSI shared data based on the received RSSI value data or the like ( Step 104). When generating the RSSI shared data, the signal information sharing unit 47 stores the generated data in the shared information storage unit 48. The signal information sharing unit 47 generates RSSI shared data by associating the RSSI value, the MAC address of the own device, and the MAC address of the wireless terminal device 30.

  When the RSSI shared data is stored, the signal information sharing unit 47 sends the generated RSSI shared data to the optimum determination unit 46 as a shared information signal S47. When receiving the RSSI shared data as the shared information signal S47, the optimum determining unit 46 sends the received data to the belonging control unit 45 as the belonging control response signal S44. When the attribution control unit 45 receives the RSSI shared data as the attribution control response signal S44, the attribution control unit 45 sends the received data to the communication control unit 42 as the terminal management unit response signal S42.

  When receiving the RSSI shared data as the terminal management unit response signal S42, the communication control unit 42 adds data indicating broadcast to the received data and sends the data to the communication unit 41. When receiving the RSSI shared data, the communication unit 41 converts the received data into a predetermined signal format and transmits it to another wireless device (step 105).

  The RSSI shared data transmitted from the first radio apparatus 10 and the second radio apparatus 20 is sent to other radio apparatuses. The RSSI shared data sent from the other wireless device to the first wireless device 10 and the second wireless device 20 is input to the communication unit 41 (step 106). When receiving the RSSI shared data of another wireless device, the communication unit 41 sends the received data to the communication control unit 42. When the communication control unit 42 detects that the received data is RSSI shared data broadcast from another wireless device, the communication control unit 42 uses the received RSSI shared data as a terminal management unit control signal S41, and belongs to the belonging control unit 45 of the terminal management unit 44. Send to.

  When the attribution control unit 45 receives the RSSI shared data as the terminal management unit control signal S41, the attribution control unit 45 sends the received data to the optimum determination unit 46 as the determination unit control signal S43. When receiving the RSSI shared data as the determination unit control signal S43, the optimum determination unit 46 sends the received data to the signal information sharing unit 47 as the information sharing unit control signal S46.

  When the signal information sharing unit 47 receives the RSSI shared data as the information sharing unit control signal S46, the signal information sharing unit 47 extracts data that is not stored in its own device from the received data with reference to the shared information storage unit 48. When the signal information sharing unit 47 extracts the data that is not stored in the device itself, the signal information sharing unit 47 adds the extracted data to the RSSI shared data of the shared information storage unit 48 and stores it (step 107).

  FIG. 5 shows an example of a data table of RSSI shared data of this embodiment. In the example of FIG. 5, the MAC address of the wireless device that is the wireless LAN access point, the MAC address of the wireless terminal device that is the wireless LAM slave device, and the RSSI value of the wireless signal received by each wireless device are stored in association with each other. .

  The terminal management unit 44 waits in a state of waiting for RSSI shared data from another device until a predetermined time elapses (step 108). When a predetermined time has elapsed since the determination of the attribution destination of the communication terminal device 30 is started, the optimum determination unit 46 starts the determination of the optimum attribution destination of the wireless terminal device 30. When the determination of the optimal attribution destination of the wireless terminal device 30 is started, the optimal determination unit 46 sends a signal requesting RSSI shared data to the signal information sharing unit 47 as the information sharing unit control signal S46.

  When the signal information sharing unit 47 receives the information sharing unit control signal S46 for requesting RSSI shared data, the signal information sharing unit 47 reads the RSSI shared data from the shared information storage unit 48 and sends the read data as the shared information signal S47 to the optimum determination unit 46. send.

  When obtaining the RSSI shared data, the optimum determination unit 46 determines the wireless device having the largest RSSI value among the RSSI values of the wireless terminal device 30 having the same MAC address (step 109). When the wireless device having the largest RSSI value is the own device (Yes in Step 110), the optimum determination unit 46 determines that the own device is the most suitable as the attribution destination of the wireless terminal device 30 (Step 111).

  When determining that the optimum attribution destination of the wireless terminal device 30 is the own device, the optimum determination unit 46 sends information indicating that the optimum attribution destination is the own device to the attribution control unit 45 as an attribution control response signal S44.

  When the attribution control unit 45 receives information indicating that the wireless terminal device 30 belongs to itself as the attribution control response signal S44, the attribution control unit 45 generates data of an attribution response signal indicating that the attribution destination is the own device. . When the attribution response signal data is generated, the attribution control unit 45 sends the generated data to the communication control unit 42 as the terminal management unit response signal S42.

  When the communication control unit 42 receives the data of the attribution response signal as the terminal management unit response signal S42, the communication control unit 42 adds the address information of the wireless terminal device 30 that is the transmission destination to the received data and sends the data to the wireless communication unit 43. When receiving the attribution response signal data, the wireless communication unit 43 converts the data to a wireless signal and wirelessly transmits the wireless signal to the wireless terminal device 30 (step 112).

  The attribute response signal transmitted wirelessly is sent to the wireless terminal device 30. When the wireless terminal device 30 receives the attribution response signal, the wireless terminal device 30 establishes a connection with the transmission-source wireless device of the attribution response signal and performs data communication (step 113).

  In step 110, when the wireless device having the largest RSSI value is other than its own device (No in step 110), the optimum determining unit 46 determines that another device is suitable as the destination of the wireless terminal device 30. (Step 114). If the attribution destination is another device, the optimum determination unit 46 ends the operation relating to the attribution destination determination.

  FIG. 6 is a sequence diagram showing operations in the wireless communication system of the present embodiment. As shown in FIG. 6, in the wireless communication system of this embodiment, first, the wireless terminal device 30 that is a wireless LAN slave device transmits an attribution request by broadcast. Each wireless LAN access point provided in the wireless communication system, that is, the first wireless device 10 and the second wireless device 20 receive the attribution request from the wireless terminal device 30.

  When receiving the attribution request from the wireless terminal device 30 which is a wireless LAN slave device, each wireless device provided as each wireless LAN access point generates RSSI shared data. When the wireless device of each wireless LAN access point generates the RSSI shared data, it broadcasts to each other and shares the generated data. The wireless device of each wireless LAN access point generates RSSI shared data by adding the data received from the wireless device of another wireless LAN access point within the predetermined time to the data generated by itself.

  When a predetermined time elapses, the wireless device of each wireless LAN access point determines an optimal belonging destination of the wireless terminal device 30 that is the attribution request source. When the optimum attribution destination of the wireless terminal device 30 is determined, only the wireless device of the wireless LAN access point determined by the own device as the optimum attribution destination transmits an attribution response to the attribution request source wireless terminal device 30.

  In the example of FIG. 6, the first wireless device 10 determines that its own device is optimal as a destination of the wireless terminal device 30. In addition, the second radio apparatus 20 determines that the first radio apparatus 10 is optimal as the attribution destination of the radio terminal apparatus 30. In the example of FIG. 6, only the first wireless device 10 that has been determined that the own device is optimal as the attribution destination of the wireless terminal device 30 transmits the belonging response to the wireless terminal device 30. By determining the attribution destination of the wireless terminal device 30 by such a method, the wireless terminal device 30 can perform communication by belonging to the wireless LAN access point where the wireless signal reaches the strongest.

  In the wireless communication system of the present embodiment, the first wireless device 10 and the second wireless device 20 each generate RSSI shared data based on the attribution request transmitted from the wireless terminal device 30. The generated RSSI shared data is transmitted to each other, and the first wireless device 10 and the second wireless device 20 share the RSSI value information of the wireless terminal device 30 received by the other wireless device. Generate data. The first radio apparatus 10 and the second radio apparatus 20 determine an optimum radio apparatus as an attribute to which the radio terminal apparatus 30 belongs based on the RSSI shared data generated in this way.

  As a result of the determination, the wireless device that has been determined that the own device is optimal as the attribution destination of the wireless terminal device 30 transmits an attribution response to the wireless terminal device 30. In addition, a wireless device that has been determined that another device is the most suitable destination for the wireless terminal device 30 does not transmit an attribution response to the wireless terminal device 30. Therefore, the wireless terminal device 30 receives the belonging response only from the wireless device that is optimal as the belonging destination, and belongs to the transmitting wireless device. As a result, the wireless terminal device 30 can perform wireless communication with the wireless device with high communication quality.

  In the wireless communication system according to the present embodiment, since the optimum belonging destination is determined on the wireless device side which is a wireless LAN access point, it is not necessary to have a special function on the wireless terminal device 30 side. For this reason, in the wireless communication system of the present embodiment, it is possible to manage attribution without depending on the function of the wireless terminal device 30 that is a wireless LAN slave device or the wireless attribution policy. Further, in the wireless communication system of the present embodiment, it is not necessary to perform a complicated setting operation even when a wireless LAN access point is added or when the use of the wireless terminal device 30 is newly started.

  As described above, in the wireless communication system according to the present embodiment, it is possible to obtain a high communication quality by assigning a wireless terminal device to an optimal access point in a wireless communication system including a plurality of access points.

(Third embodiment)
A third embodiment of the present invention will be described in detail with reference to the drawings. In the second embodiment, the wireless device to which the wireless terminal device belongs is determined based on the strength of the signal without considering the frequency band of the wireless signal. The wireless communication system according to the present embodiment is characterized in that the priority of determination is set for each frequency band, and the wireless device to which the wireless terminal device is optimally assigned is determined.

  The configuration of the wireless communication system of this embodiment is the same as that of the second embodiment. Therefore, with reference to FIG. 7, only operation | movement at the time of the attribution destination of the radio | wireless communication apparatus 30 being determined is demonstrated. FIG. 7 shows an outline of an operation flow when the destination of the wireless terminal device 30 is determined in the wireless communication system of the present embodiment. Hereinafter, the configuration of the wireless communication system will be described with reference to FIGS. 2 and 3.

  The operation from step 121 to 123 of this embodiment, that is, the operation from when the wireless terminal device 30 transmits the attribution request signal to when the data such as the RSSI value is input to the signal information sharing unit 47 is the second. This is the same as steps 101 to 103 in the embodiment.

  Upon receiving the information sharing unit control signal S46 and the signal strength signal S45, the signal information sharing unit 47 generates RSSI shared data based on the received RSSI value data and the like (step 124). When generating the RSSI shared data, the signal information sharing unit 47 stores the generated data in the shared information storage unit 48. In the present embodiment, the signal information sharing unit 47 generates RSSI shared data in which the RSSI value, the MAC address of the own device, the MAC address of the wireless terminal device 30 and the frequency information of the wireless signal are associated with each other.

  When the RSSI shared data is stored, the signal information sharing unit 47 sends the generated RSSI shared data to the optimum determination unit 46 as a shared information signal S47. When receiving the RSSI shared data as the shared information signal S47, the optimum determining unit 46 sends the received data to the belonging control unit 45 as the belonging control response signal S44. When the attribution control unit 45 receives the RSSI shared data as the attribution control response signal S44, the attribution control unit 45 sends the received data to the communication control unit 42 as the terminal management unit response signal S42.

  When receiving the RSSI shared data as the terminal management unit response signal S42, the communication control unit 42 adds data indicating broadcast to the received data and sends the data to the communication unit 41. When the communication unit 41 receives the RSSI shared data, the communication unit 41 converts the received data into a predetermined signal format and transmits the data to other wireless devices in the wireless communication system (step 125).

  The RSSI shared data transmitted from the first radio apparatus 10 and the second radio apparatus 20 is sent to other radio apparatuses. The RSSI shared data sent from the other wireless device to the first wireless device 10 and the second wireless device 20 is input to the communication unit 41 (step 126). When receiving the RSSI shared data of another wireless device, the communication unit 41 sends the received data to the communication control unit 42. When the communication control unit 42 detects that the received data is RSSI shared data broadcast from another wireless device, the communication control unit 42 uses the received RSSI shared data as a terminal management unit control signal S41, and belongs to the belonging control unit 45 of the terminal management unit 44. Send to.

  When the attribution control unit 45 receives the RSSI shared data as the terminal management unit control signal S41, the attribution control unit 45 sends the received data to the optimum determination unit 46 as the determination unit control signal S43. When receiving the RSSI shared data as the determination unit control signal S43, the optimum determination unit 46 sends the received data to the signal information sharing unit 47 as the information sharing unit control signal S46.

  When the signal information sharing unit 47 receives the RSSI shared data as the information sharing unit control signal S46, the signal information sharing unit 47 extracts data that is not stored in its own device from the received data with reference to the shared information storage unit 48. When the signal information sharing unit 47 extracts the data that is not stored in the device itself, the signal information sharing unit 47 adds the extracted data to the RSSI shared data of the shared information storage unit 48 and stores it (step 127).

  The terminal management unit 44 waits in a state of waiting for RSSI shared data from another device until a predetermined time elapses (step 128). When a predetermined time has elapsed since the optimum determination of the attribution destination of the communication terminal device 30 is started, the optimum determination unit 46 starts determining the optimum attribution destination of the wireless terminal device 30. When the determination of the optimal attribution destination of the wireless terminal device 30 is started, the optimal determination unit 46 sends a signal requesting RSSI shared data to the signal information sharing unit 47 as the information sharing unit control signal S46.

  When the signal information sharing unit 47 receives the information sharing unit control signal S46 for requesting RSSI shared data, the signal information sharing unit 47 reads the RSSI shared data from the shared information storage unit 48 and sends the read data as the shared information signal S47 to the optimum determination unit 46. send.

  When the RSSI shared data is acquired, the optimum determination unit 46 weights the RSSI value according to a predetermined reference for each radio frequency (step 129). In the present embodiment, the optimum determination unit 46 performs weighting for each radio frequency by standardizing based on a reference value set in advance for each radio frequency. The weighting of the RSSI value may be performed based on the maximum RSSI value for each radio frequency. Further, weighting may be performed by adding a value set in advance for each radio frequency to the RSSI value.

  FIG. 8 shows an example of a data table of RSSI shared data of this embodiment. In the example of FIG. 8, the MAC address of the wireless device, the MAC address of the wireless terminal device, the wireless frequency, the RSSI value of the wireless signal received by each wireless device, and the weighted RSSI correction value are associated with each other and stored. Has been.

  When the RSSI value is normalized, the optimum determination unit 46 determines the wireless device and the wireless frequency having the largest normalized RSSI value (step 130). When the wireless device with the largest RSSI value is any value of the own device (Yes in step 131), the optimum determining unit 46 determines that the own device is the most suitable as the attribution destination of the wireless terminal device 30. (Step 132). When determining the optimum attribution destination of the wireless terminal device 30, the optimum determination unit 46 transmits information indicating that the optimum attribution destination is the own device and the radio frequency to the attribution control unit 45 as an attribution control response signal S44.

  When the attribution control unit 45 receives information indicating that the wireless terminal device 30 is the own device and the radio frequency as the belonging control response signal S44, the attribution control unit 45 indicates that the radio frequency information and the own device are the own device. Attribution response signal data is generated. When the attribution response signal data is generated, the attribution control unit 45 sends the generated data to the communication control unit 42 as the terminal management unit response signal S42.

  When the communication control unit 42 receives the data of the attribution response signal as the terminal management unit response signal S42, the communication control unit 42 adds the address information of the wireless terminal device 30 that is the transmission destination to the received data and sends the data to the wireless communication unit 43. When receiving the attribution response signal data, the wireless communication unit 43 converts the data into a wireless signal and wirelessly transmits the wireless signal to the wireless terminal device 30 (step 133).

  The attribute response signal transmitted wirelessly is sent to the wireless terminal device 30. When the wireless terminal device 30 receives the attribution response signal, the wireless terminal device 30 establishes a connection with the designated radio frequency with the wireless device that is the transmission source of the attribution response signal and performs data communication (step 134).

  When the wireless device having the largest RSSI value in step 131 is other than the own device (No in step 132), the optimum determining unit 46 determines that another device is suitable as the attribution destination of the wireless terminal device 30 ( Step 135). If the attribution destination is another device, the optimum determination unit 46 ends the operation relating to the attribution destination determination.

  The wireless communication system of this embodiment can obtain the same effects as those of the second embodiment. In the wireless communication system of the present embodiment, the first wireless device 10 and the second wireless device 20 weight the RSSI values of the wireless signals shared with each other based on a reference set for each wireless frequency. Yes. The first wireless device 10 and the second wireless device 20 determine the optimum attribution destination of the wireless terminal device 30 based on the RSSI value after performing weighting and correction. Therefore, even when the first radio apparatus 10 and the second radio apparatus 20 have different radio frequencies, it is possible to determine the optimum attribution destination of the radio terminal apparatus 30. As a result, in the wireless communication system according to the present embodiment, it is possible to more accurately determine the optimal destination of the wireless terminal device 30.

(Fourth embodiment)
A fourth embodiment of the present invention will be described in detail with reference to the drawings. In the wireless communication systems of the second and third embodiments, the attribution destination is determined based on a radio signal transmitted / received at a predetermined time after the attribution decision is started. The present embodiment is characterized in that the attribution is determined when data from all wireless devices in the wireless communication network is collected.

  The configuration of the wireless communication system of this embodiment is the same as that of the second embodiment. Therefore, with reference to FIG. 9, only operation | movement at the time of determining the attribution destination of a radio | wireless communication apparatus is demonstrated. FIG. 9 shows an outline of an operation flow when the destination of the wireless terminal device 30 is determined in the wireless communication system of the present embodiment. In the following, the configuration of the wireless communication system will be described with reference to FIGS. 2 and 3. The optimum determination unit 46 of the wireless device 40 of this embodiment stores information such as the MAC address of the wireless device in the wireless communication network in advance.

  The operations from step 141 to 145 of this embodiment, that is, the operations from when the wireless terminal device 30 transmits the attribution request signal to when the RSSI shared data is transmitted to other wireless devices are the same as those of the second embodiment. The same as steps 101 to 105.

  The first wireless device 10 and the second wireless device 20 receive the RSSI shared data transmitted from the other wireless devices in the communication unit 41 (step 146). When receiving the RSSI shared data of another wireless device, the communication unit 41 sends the received data to the communication control unit 42. When the communication control unit 42 detects that the received data is RSSI shared data broadcast from another wireless device, the communication control unit 42 uses the received RSSI shared data as a terminal management unit control signal S41, and belongs to the belonging control unit 45 of the terminal management unit 44. Send to.

  When the attribution control unit 45 receives the RSSI shared data as the terminal management unit control signal S41, the attribution control unit 45 sends the received data to the optimum determination unit 46 as the determination unit control signal S43. When receiving the RSSI shared data as the determination unit control signal S43, the optimum determination unit 46 sends the received data to the signal information sharing unit 47 as the information sharing unit control signal S46.

  When the signal information sharing unit 47 receives the RSSI shared data as the information sharing unit control signal S46, the signal information sharing unit 47 extracts data that is not stored in its own device from the received data with reference to the shared information storage unit 48. When the signal information sharing unit 47 extracts the data that is not stored in the device itself, the signal information sharing unit 47 adds the extracted data to the RSSI shared data of the shared information storage unit 48 and stores it (step 147).

  When the signal information sharing unit 47 extracts data that is not stored in the own device and adds the extracted data to the RSSI shared data of the shared information storage unit 48 and stores the extracted data, the optimum determination unit 46 receives information on all wireless devices. Determine if has been saved. If there is still a wireless device that has not received the RSSI shared data (No in step 148), the optimum determination unit 46 waits until the next RSSI shared data is sent. When the RSSI shared data is received, the wireless device 40 performs the operation from step 146.

  When the RSSI shared data is received from all the wireless devices (Yes in 148), the optimum determination unit 46 starts determining the optimum attribution destination of the wireless terminal device 30. When the determination of the optimal attribution destination of the wireless terminal device 30 is started, the optimal determination unit 46 sends a signal requesting RSSI shared data to the signal information sharing unit 47 as the information sharing unit control signal S46.

  When the signal information sharing unit 47 receives the information sharing unit control signal S46 for requesting RSSI shared data, the signal information sharing unit 47 reads the RSSI shared data from the shared information storage unit 48 and sends the read data as the shared information signal S47 to the optimum determination unit 46. send.

  When obtaining the RSSI shared data, the optimum determination unit 46 determines the wireless device having the largest RSSI value among the RSSI values of the wireless terminal device 30 having the same MAC address (step 149). The operations after Step 149 are performed in the same manner as Step 105 to Step 114 in the second embodiment. That is, the belonging wireless device 40 transmits an belonging response signal to the wireless terminal device 30 to perform wireless communication.

  FIG. 10 is a sequence diagram showing operations in the wireless communication system of the present embodiment. As shown in FIG. 10, in the wireless communication system of the present embodiment, first, the wireless terminal device 30 which is a wireless LAN slave device transmits an attribution request by broadcast. Each wireless LAN access point provided in the wireless communication system, that is, the first wireless device 10 and the second wireless device 20 receive the attribution request from the wireless terminal device 30.

  When receiving the attribution request from the wireless terminal device 30 which is a wireless LAN slave device, each wireless device provided as each wireless LAN access point generates RSSI shared data. When the wireless devices of the wireless LAN access points generate RSSI shared data, they share the data generated by broadcasting each other. The wireless device of each wireless LAN access point waits until it receives RSSI shared data from all other wireless devices provided in the wireless communication system.

  Even in the case of waiting until RSSI shared data is received from all other wireless devices, the standby state for receiving RSSI shared data may be until a predetermined time elapses. It is possible to cope with a case where there is a wireless device of a wireless LAN access point for which an attribution request from the wireless terminal device 30 has not arrived by dividing it by a predetermined time.

  When the RSSI shared data is received from all the wireless devices, the wireless device of each wireless LAN access point determines the optimal attribution destination of the wireless terminal device 30 that is the attribution request source. When the optimum attribution destination of the wireless terminal device 30 is determined, only the wireless device of the wireless LAN access point determined by the own device as the optimum attribution destination transmits an attribution response to the attribution request source wireless terminal device 30. By determining the attribution destination of the wireless terminal device 30 by such a method, the wireless terminal device 30 can quickly associate with the wireless LAN access point where the wireless signal reaches the strongest and start wireless communication. it can.

  Also in the wireless communication system of the present embodiment, the optimal attribution destination may be determined based on the RSSI value that is weighted for each radio frequency as in the third embodiment.

  The wireless communication system of this embodiment can obtain the same effects as those of the second embodiment. In the wireless communication system according to the present embodiment, the first wireless device 10 and the second wireless device 20 acquire the RSSI shared data from all the wireless devices in the wireless communication system. Judgment of the best attribution is started. When waiting for a predetermined time for the RSSI shared data sent from another wireless device, a margin is expected in the time required for the RSSI shared data to be sent from the other wireless device to reliably receive the data. There is a need. In this embodiment, when RSSI shared data is acquired from all the wireless devices in the wireless communication system, the determination of the optimal attribution destination is started, so the time until the attribution response is transmitted to the wireless terminal device 30 is determined. It becomes possible to shorten. Therefore, in the wireless communication system of the present embodiment, it is possible to shorten the time required for establishing a connection between the wireless device and the wireless terminal device 30, and to perform wireless communication at an early stage.

DESCRIPTION OF SYMBOLS 1 Wireless communication means 2 Shared information storage means 3 Information sharing means 4 Judgment means 5 Attribution response means 10 1st radio | wireless apparatus 20 2nd radio | wireless apparatus 30 Radio | wireless terminal apparatus 40 Radio | wireless apparatus 41 Communication part 42 Communication control part 43 Radio | wireless communication part 44 Terminal management unit 45 Attribution control unit 46 Optimal determination unit 47 Signal information sharing unit 48 Shared information storage unit S41 Terminal management unit control signal S42 Terminal management unit response signal S43 Judgment unit control signal S44 Attribution control response signal S45 Signal strength signal S46 information Shared part control signal S47 Shared information signal

Claims (10)

Wireless communication means for performing wireless communication with the wireless terminal device;
Sharing that stores the wireless signal strength of the wireless terminal device received via wireless communication means as first shared information in association with the identification information of the wireless terminal device when an attribution request is received from the wireless terminal device Information storage means;
Information associating the wireless signal strength of the wireless terminal device received by the other device with the identification information of the wireless terminal device is acquired from the other device as second shared information, and the acquired second shared information is obtained. Information sharing means for adding to the first shared information;
Determining means for determining an optimal destination of the wireless terminal device based on the first shared information;
A wireless device comprising: an attribution response means for transmitting an attribution response to the wireless terminal device when the optimum attribution destination of the wireless terminal device is the device itself.   The radio apparatus according to claim 1, wherein the information sharing means further includes means for transmitting the first shared information generated by the own apparatus to the other apparatus. The shared information storage means stores the frequency information of the wireless signal as the first shared information in association with the strength of the wireless signal and the identification information of the wireless terminal device,
The information sharing means uses, as the second shared information, information associating the wireless signal strength of the wireless terminal device received by the other device and the identification information of the wireless terminal device with the frequency information of the wireless signal. The wireless device according to claim 1, wherein the wireless device is obtained from another device.   The determination unit performs weighting based on the frequency to calculate a correction value of the strength stored in the first shared information, and determines an optimal attribution destination of the wireless terminal device based on the correction value. The wireless device according to claim 3, wherein the determination is made.   The determination means adds the second shared information sent from all the other devices set in advance by the information sharing means to the first shared information. The wireless device according to claim 1, wherein a belonging destination is determined. A first wireless access point comprising the wireless device according to claim 1;
A second wireless access point comprising the wireless device according to any one of claims 1 to 5;
A wireless terminal device that performs wireless communication with the first wireless access point and the second wireless access point;
The information sharing means of the first wireless access point obtains a wireless signal strength of the wireless terminal device received by the second wireless access point;
The belonging response means of the first wireless access point transmits an belonging response to the wireless terminal device when the optimum belonging destination of the wireless terminal device is its own device. . When receiving a request for attribution from a wireless terminal device, the received wireless signal strength of the wireless terminal device is stored as first shared information in association with identification information of the wireless terminal device,
Information obtained by associating the wireless signal strength of the wireless terminal device received by the other device with the identification information of the wireless terminal device is obtained as second shared information from the other device, and the second information obtained from the other device is obtained. Added to the first shared information,
Based on the first shared information, determine an optimal attribution destination of the wireless terminal device,
When the optimum attribution destination of the wireless terminal device is its own device, an attribution response is transmitted to the wireless terminal device,
A communication method comprising performing wireless communication with the wireless terminal device. The wireless signal frequency information is stored as the first shared information in association with the wireless signal intensity and the identification information of the wireless terminal device,
The wireless terminal device receives the wireless signal strength of the wireless terminal device received by the other device, identification information of the wireless terminal device, and frequency information of the wireless signal from the other device as second shared information. Item 8. The communication method according to Item 7.   Performing weighting based on the frequency to calculate a correction value of the intensity stored in the first shared information, and determining an optimal destination of the wireless terminal device based on the correction value; The communication method according to claim 8.   When the second shared information sent from all the other devices set in advance is added to the first shared information, an optimum attribution destination of the wireless terminal device is determined. The communication method according to any one of claims 7 to 9.

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