JP2015201752A - Connection control system, control server, connection control method, and computer program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress reduction in communication efficiency of the whole system.SOLUTION: A connection control system comprises: a relay device for communicating with a communication device; and a control server for controlling connection between the relay device and the communication device. The relay device comprises: a management frame transmission unit for transmitting a management frame transmitted from the communication device to the control server; and a connection control unit for controlling connection with the communication device according to a response instruction to a management frame transmitted from the control server. The control server comprises: a determination unit for determining, when a management frame is received, a relay device to be an attribution destination of a communication device of the management frame's transmission source on the basis of radio wave situations of relay devices existing around the communication device; and a communication unit for transmitting, to the determined relay device, a control signal including a response instruction to the management frame.

Description

  The present invention relates to a technique for controlling connection.

  In recent years, usage scenes of wireless LAN (Local Area Network; for example, Wi-Fi (registered trademark) (Wireless Fidelity)) are increasing (for example, see Patent Document 1). Accordingly, it is desired that communication devices (for example, smartphones, personal computers, etc.) used by users are efficiently assigned to wireless access points (hereinafter referred to as “AP”).

JP 2005-094656 A

  However, conventionally, since the communication device determines the AP to which it belongs according to the surrounding radio wave conditions, the communication device cannot be efficiently attached to the AP. For example, when a specific AP having a good radio wave environment exists around a plurality of communication devices, the plurality of communication devices are concentrated and connected to the AP having a good radio wave environment. For this reason, the communication efficiency of the communication device connected to the specific AP is reduced. As a result, there is a problem that the communication efficiency of the entire system is lowered.

  In view of the above circumstances, an object of the present invention is to provide a technique for suppressing a decrease in communication efficiency of the entire system.

  One aspect of the present invention is a connection control system including a relay device that communicates with a communication device, and a control server that controls connection between the relay device and the communication device, and the relay device is connected to the communication device. A management frame transmission unit that transmits the transmitted management frame to the control server, and a connection control unit that controls connection with the communication device in response to a response instruction to the management frame transmitted from the control server. And when the management frame is received, the control server includes a relay device to which the communication device belongs, based on a radio wave condition of the relay device existing around the communication device that is the transmission source of the management frame. A connection control system comprising: a determining unit that determines; and a communication unit that transmits a control signal including a response instruction to the management frame to the determined relay device

  One aspect of the present invention is the connection control system described above, wherein the relay device includes a communication state notification unit that periodically notifies the control server of information related to a communication state with the communication device in communication. The control server further includes a connection management unit that dynamically changes an attribution destination of the communication device based on the notified information on the communication state, and the connection management unit has a poor communication state. Is satisfied, the relay device having a better radio wave condition than the relay device to which the communication device belongs is changed to the relay device to which the communication device belongs.

  One aspect of the present invention is the connection control system described above, wherein the communication unit does not transmit the control signal when a condition indicating that the determined radio wave condition of the relay device is satisfied.

  One aspect of the present invention is a control server that controls a connection between a communication device and a relay device that communicates with the communication device, and receives a management frame transmitted from the communication device via the relay device. A determination unit that determines a relay device to which the communication device belongs based on a radio wave condition of a relay device that exists in the vicinity of the communication device that is the transmission source of the management frame, and for the determined relay device And a communication unit that transmits a control signal including a response instruction to the management frame.

  One aspect of the present invention is a connection control method in a connection control system including a relay device that communicates with a communication device, and a control server that controls connection between the relay device and the communication device, and the relay device includes: A management frame transmission step of transmitting a management frame transmitted from the communication device to the control server; and a connection between the relay device and the communication device in response to a response instruction to the management frame transmitted from the control server. A connection control step for controlling the communication device, and when the control server receives the management frame, the communication server is assigned based on a radio wave condition of a relay device existing around the communication device that is the transmission source of the management frame. A determination step of determining a relay device that is a destination, and a response instruction to the management frame from the control server to the determined relay device A communication step of transmitting a control signal including a connection control method with.

  One aspect of the present invention is a connection control system including a relay device that communicates with a communication device and a control server that controls connection between the relay device and the communication device. A management frame transmitting step for operating the second computer corresponding to the control server, wherein the management frame is transmitted to the control server from the communication device to the first computer; And a connection control step for controlling connection with the communication device in response to a response instruction to the management frame transmitted from the control server, and the management frame is received by the second computer And based on the radio wave condition of the relay device existing around the communication device that is the transmission source of the management frame, A determination step of determining a relay device to which the communication device belongs, and a communication step in which the control server transmits a control signal including a response instruction to the management frame to the determined relay device. It is a computer program for.

  According to the present invention, it is possible to suppress a decrease in communication efficiency of the entire system.

It is a figure which shows the system configuration | structure of the connection control system 100 in this invention. It is a schematic block diagram showing the function structure of AP10. 3 is a schematic block diagram illustrating a functional configuration of a control server 20. FIG. It is a figure which shows the specific example of an apparatus information database. It is a flowchart which shows the flow of a process of the control server 20 in this embodiment. It is a flowchart which shows the flow of the belonging confirmation process of the control server 20 in this embodiment. It is a sequence diagram which shows the flow of operation | movement of the connection control system 100 in this embodiment. It is a sequence diagram which shows the flow of operation | movement of the connection control system 100 in this embodiment.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram showing a system configuration of a connection control system 100 according to the present invention. The connection control system 100 includes an AP 10 (10-1 to 10-2) and a control server 20. A communication device 30 is connected to the connection control system 100. The APs 10-1 and 10-2 are communicably connected to the control server 20 via the network 40. A range in which radio waves reach from the AP 10-1 is represented as a cell 11-1. Further, a range in which radio waves reach from the AP 10-2 is represented as a cell 11-2. The communication device 30 exists within the communicable range of the APs 10-1 and 10-2. In the following description, AP10-1 and AP-2 are described as AP10 unless otherwise distinguished.

  The AP 10 is a wireless LAN access point, and communicates with the communication device 30 by wireless LAN connection. For example, Wi-Fi is used for the wireless LAN connection. The AP 10 transmits and receives management frames and data to and from the communication device 30. The management frame is a frame used for connection between the AP 10 and the communication device 30. For example, the management frame is a probe request, a probe response, an authentication frame, an association request, and an association response. The AP 10 communicates with the control server 20.

The control server 20 is configured using an information processing apparatus and is connected to the AP 10 so as to be communicable. The control server 20 controls the operation of each AP 10. For example, the control server 20 controls the connection between each AP 10 and the communication device 30.
The communication device 30 is configured using an information processing device such as a smartphone, a tablet terminal, a mobile phone, a personal computer, a notebook computer, or a game machine. The communication device 30 communicates with the AP 10. The communication device 30 transmits / receives a management frame and data to / from the AP 10.
The network 40 may be a network configured in any way. For example, the network 40 may be configured using NGN (Next Generation Network) or WAN (Wide Area Network).

FIG. 2 is a schematic block diagram illustrating a functional configuration of the AP 10.
The AP 10 includes a CPU (Central Processing Unit), a memory, an auxiliary storage device, and the like connected by a bus, and executes a relay program. By executing the relay program, the AP 10 includes a first communication unit 101, a control unit 102, a management frame transmission unit 103, a communication state notification unit 104, a second communication unit 105, a connection control unit 106, and a signal generation unit 107. Function. All or some of the functions of the AP 10 may be realized using hardware such as an application specific integrated circuit (ASIC), a programmable logic device (PLD), or a field programmable gate array (FPGA). The relay program may be recorded on a computer-readable recording medium. The computer-readable recording medium is, for example, a portable medium such as a flexible disk, a magneto-optical disk, a ROM, a CD-ROM, or a storage device such as a hard disk built in the computer system. Further, the relay program may be transmitted / received via a telecommunication line.

The first communication unit 101 communicates with the communication device 30. For example, the first communication unit 101 receives a probe request transmitted from the communication device 30. For example, the first communication unit 101 transmits a signal generated by the signal generation unit 107 to the communication device 30.
The control unit 102 controls each functional unit of the AP 10. Each time a signal is received by the first communication unit 101, the control unit 102 acquires an RSSI (Received Signal Strength Indicator) of the received signal. In addition, the control unit 102 periodically acquires information related to a communication state during communication with the communication device 30 (hereinafter referred to as “communication state information”). For example, the control unit 102 may acquire the communication state information every time data is transmitted / received.

The management frame transmission unit 103 transmits a probe request (management frame) to the control server 20 via the second communication unit 105. When the management frame transmission unit 103 notifies the probe request, the management frame transmission unit 103 gives the RSSI value acquired by the control unit 102 to the probe request.
The communication state notification unit 104 periodically notifies the control server 20 of communication state information via the second communication unit 105 during communication with the communication device 30. For example, the communication state notification unit 104 may notify the communication state information every time the communication state information is acquired. The communication status information includes, for example, information such as the MAC address of the communication device 30, RSSI, the data retransmission rate due to a data error, and the packet retransmission rate due to packet collision.

The second communication unit 105 communicates with the control server 20. For example, the second communication unit 105 transmits a probe request to the control server 20. For example, the second communication unit 105 receives a response instruction transmitted from the control server 20.
The connection control unit 106 controls the connection between the own device and the communication device 30 according to the response instruction received by the second communication unit 105.
The signal generation unit 107 generates a signal according to the control of the connection control unit 106. For example, the signal generation unit 107 generates a probe response. Further, for example, the signal generation unit 107 generates a Deauth signal. The Deauth signal is a signal for releasing the connection with the communication device 30 belonging to the own device.

FIG. 3 is a schematic block diagram illustrating a functional configuration of the control server 20.
The control server 20 includes a CPU, a memory, an auxiliary storage device, and the like connected by a bus and executes a management program. By executing the management program, the control server 20 functions as a device including the communication unit 201, the reading unit 202, the device information storage unit 203, the determination unit 204, the signal generation unit 205, and the connection management unit 206. All or some of the functions of the AP 10 may be realized using hardware such as an ASIC, PLD, or FPGA. The management program may be recorded on a computer-readable recording medium. The computer-readable recording medium is, for example, a portable medium such as a flexible disk, a magneto-optical disk, a ROM, a CD-ROM, or a storage device such as a hard disk built in the computer system. Further, the management program may be transmitted / received via a telecommunication line.

The communication unit 201 communicates with the AP 10. For example, the communication unit 201 receives a signal transmitted from the AP 10. For example, the communication unit 201 transmits a control signal generated by the signal generation unit 205 to the AP 10. The control signal is a signal used for controlling the connection of the AP 10. The control signal includes control information such as a probe response transmission instruction and a Deauth signal transmission instruction.
The reading unit 202 reads a signal received by the communication unit 201 (hereinafter referred to as “reception signal”). Specifically, the reading unit 202 determines whether the received signal is a management frame from the header information of the received signal.

The device information storage unit 203 is configured using a storage device such as a magnetic hard disk device or a semiconductor storage device. The device information storage unit 203 stores a device information database. The device information database is a database in which information related to the communication device 30 is registered.
The determination unit 204 determines the AP 10 to which the communication device 30 belongs.
The signal generation unit 205 generates a control signal. For example, the signal generation unit 205 generates a control signal based on the AP 10 information (for example, a MAC address) determined by the determination unit 204. In this case, the control signal includes a probe response transmission instruction.
The connection management unit 206 controls the connection of the communication device 30 belonging to the own device by periodically referring to the device information database.

FIG. 4 is a diagram showing a specific example of the device information database.
The device information database has a plurality of records 50 representing information related to the communication device 30. The record 50 has each value of MAC_STA, belonging AP information, and neighboring AP information. MAC_STA represents the MAC address of the communication device 30. The belonging AP information represents information related to the AP 10 to which the communication device 30 belongs (hereinafter referred to as “attached AP”). Specific examples of belonging AP information include ID, RSSI, data retransmission rate, and packet retransmission rate. The ID of the belonging AP information represents identification information for identifying the belonging AP. The RSSI of the belonging AP information represents the radio field intensity of the signal received from the communication device 30 by the belonging AP. Specific examples of RSSI include an average value and a variance value. The average value represents an average value of RSSI in a predetermined time (for example, 1 hour). The variance value represents the RSSI variance value at a predetermined time (for example, 1 hour).

  The data retransmission rate represents the frequency of data retransmission due to a data error in communication performed between the communication device 30 and the belonging AP. The packet retransmission rate represents the collision frequency of packets in communication performed between the communication device 30 and the belonging AP. The adjacent AP information represents information related to the AP 10 (hereinafter referred to as “adjacent AP”) located around the communication device 30. Specific examples of adjacent AP information include ID and RSSI. The ID of the neighboring AP represents identification information for identifying the neighboring AP. The RSSI of the adjacent AP represents the radio field intensity of the signal received by the adjacent AP from the communication device 30. Specific examples of RSSI include an average value and a variance value. The average value represents an average value of RSSI in a predetermined time (for example, 1 hour). The variance value represents the RSSI variance value at a predetermined time (for example, 1 hour). The adjacent AP information is registered for each communication device 30 by the number of adjacent APs.

  In the example shown in FIG. 4, a plurality of MAC_STAs are recorded in the device information database. In FIG. 4, the record 50 recorded at the top of the device information database has a MAC_STA value “AAA”, a belonging AP ID value “XX”, and a belonging AP RSSI average value “−”. 40 ”, the RSSI variance value of the belonging AP information is“ 50 ”, the data retransmission rate value is“ 17 ”, the packet retransmission rate value is“ 5 ”, the adjacent AP ID value is“ YY ”, The average value of the RSSI of the AP is “−20”, and the value of the variance of the RSSI of the neighboring AP information is “40”. That is, the ID of the AP 10 to which the communication device 30 identified by the MAC address “AAA” belongs is “XX”, and the signal received by the belonging AP from the communication device 30 at a predetermined time (for example, one hour) The average value of the radio wave intensity is “−40 dBm”, the variance value of the radio wave intensity of the signal is “50 dBm”, and the data retransmission rate during communication performed between the communication device 30 and the belonging AP is “17%”. The retransmission rate of the packet is “5%”, the ID of the AP 10 located around the communication device 30 identified by the MAC address “AAA” is “YY”, and the adjacent AP is the communication device 30 It is indicated that the average value of the radio field intensity of the signal received for a predetermined time (for example, 1 hour) is “−20 dBm” and the variance value of the radio field intensity of the signal is “40 dBm”.

FIG. 5 is a flowchart showing a processing flow of the control server 20 in the present embodiment.
The communication unit 201 receives a signal transmitted from the AP 10 (step S101). The communication unit 201 outputs the received signal to the reading unit 202. The reading unit 202 reads the output reception signal (step S102). The reading unit 202 determines whether or not the received signal is a management frame from the header information of the received signal (step S103). If the received signal is not a management frame (step S103—NO), the reading unit 202 acquires communication state information included in the received signal (step S104).

  Thereafter, the reading unit 202 accumulates communication state information in the device information database (step S105). Specifically, the reading unit 202 first reads a device information database stored in the device information storage unit 203. Next, the reading unit 202 selects the record 50 corresponding to the MAC address of the communication device 30 that is the transmission source of the communication state information from among the records 50 registered in the read device information database. Then, the reading unit 202 updates the values recorded in the items of RSSI, data retransmission rate, and packet retransmission rate of the selected record 50.

  In the process of step S103, when the received signal is a management frame (step S103-YES), the reading unit 202 acquires the MAC address of the communication device 30 from the header information of the received signal (step S106). Thereafter, the reading unit 202 outputs the acquired MAC address information to the determination unit 204. The determination unit 204 refers to the device information database stored in the device information storage unit 203 and determines whether or not the communication device 30 identified by the MAC address output from the reading unit 202 is before belonging (before starting communication). (Step S107). For example, if the output MAC address is not registered in the MAC_STA item of the device information database, or if the MAC address is registered in the MAC_STA item of the device information database, the data retransmission rate and packet retransmission rate items When the value is not registered, the determination unit 204 determines that the communication device 30 identified by the output MAC address is before belonging (before communication is started). On the other hand, if the output MAC address is registered in the MAC_STA item of the device information database, and values are registered in the data retransmission rate and packet retransmission rate items, the determination unit 204 identifies the output MAC address. It is determined that the communication device 30 to be used is not before belonging.

If the communication device 30 identified by the MAC address is not before belonging (step S107—NO), the connection management unit 206 performs attribution destination confirmation processing (step S108). The belonging destination confirmation process is a process for confirming whether or not the belonging AP of the communication device 30 needs to be changed. The attribution confirmation process executed by the connection management unit 206 as the process of step S108 will be described later.
On the other hand, when the communication device 30 identified by the MAC address is before belonging (step S107—YES), the determination unit 204 belongs to the communication device 30 based on the RSSI assigned to the management frame transmitted from the AP 10. AP 10 to be determined is determined (step S109). Specifically, the determination unit 204 determines the AP 10 having the highest RSSI value among the RSSIs assigned to the management frames received during a predetermined period as the AP 10 to which the communication device 30 belongs. To do. Thereafter, the determination unit 204 determines whether or not the determined RSSI value of the AP 10 is equal to or greater than a first value (for example, −82 dBm) (step S110).

  When the determined RSSI value of the AP 10 is greater than or equal to the first value (for example, −82 dBm) (step S110—YES), the determination unit 204 transmits the determined AP 10 information (for example, the MAC address) and a probe response. The instruction is output to the signal generation unit 205. In addition, the determination unit 204 registers the information of the communication device 30 for which the attribution destination is determined in the device information database. Specifically, the determination unit 204 records the MAC address of the communication device 30 to which the attribution destination is determined in the MAC_STA item of the device information database, and the AP 10 determined in the process of step S109 in the attribution AP information item. The ID and RSSI are recorded, and the ID and RSSI of the AP 10 (excluding the AP 10 registered in the belonging AP information) located in the vicinity of the communication device 30 to which the belonging destination is determined are recorded in the adjacent AP information item.

The signal generation unit 205 generates a control signal based on the AP 10 information (for example, the MAC address) output from the determination unit 204 and a probe response transmission instruction (step S111). The communication unit 201 transmits the generated control signal to the AP 10 determined in the process of step S109 (step S112).
Further, in the process of step S110, if the determined RSSI value of the AP 10 is not equal to or greater than the first value (for example, −82 dBm) (step S110—NO), the control server 20 determines that there is no AP 10 with good radio wave conditions. To finish the process.

FIG. 6 is a flowchart showing a flow of the belonging confirmation process of the control server 20 in the present embodiment. The attribution confirmation process is performed for each communication device 30 registered in the device information database. In FIG. 6, for the sake of simplicity of explanation, a case where the information of the communication device 30 registered in the device information database is one will be described as an example.
The connection management unit 206 confirms the communication state of the communication device 30 by periodically referring to the device information database (step S201). The connection management unit 206 selects the AP 10 having the best RSSI value among the APs 10 registered in the adjacent AP item of the device information database (step S202). For example, the connection management unit 206 selects the AP 10 having the highest RSSI (average value−dispersion value) among the APs 10 registered in the adjacent AP item.

  The connection management unit 206 determines whether or not the RSSI (average value−dispersion value) of the belonging AP of the communication device 30 is less than a first value (for example, −82 dBm) (step S203). When the RSSI (average value−variance value) value of the belonging AP is not less than the first value (step S203—NO), the connection management unit 206 determines that the data retransmission rate of the belonging AP is the second value (for example, 10%). ) It is determined whether or not the above is true (step S204). When the data retransmission rate of the belonging AP is not equal to or higher than the second value (step S204—NO), the connection management unit 206 determines whether the packet retransmission rate of the belonging AP is equal to or higher than a third value (for example, 50%). Determination is made (step S205). When the packet retransmission rate of the belonging AP is not equal to or greater than the third value (step S205—NO), the connection management unit 206 determines that the communication state of the AP 10 to which the communication device 30 belongs is not bad and ends the process. .

  In the process of step S203, when the RSSI (average value−variance value) value of the belonging AP is less than the first value (step S203—YES), the connection management unit 206 selects the adjacent node selected in the process of step S202. It is determined whether the RSSI (average value-dispersion value) of the AP is higher than the RSSI (average value-dispersion value) of the belonging AP (step S206). In the process of step S204, when the data retransmission rate of the belonging AP is equal to or greater than the second value (step S204—YES), the connection management unit 206 performs the process of step S206. Also, in the process of step S205, when the packet retransmission rate of the belonging AP is greater than or equal to the third value (step S205—YES), the connection management unit 206 performs the process of step S206.

  If the RSSI value of the neighboring AP is higher than the RSSI value of the belonging AP (step S206—YES), the connection management unit 206 determines whether the RSSI value of the belonging AP is greater than or equal to a first value (eg, −82 dBm). It is determined whether or not (step S207). If the RSSI value of the belonging AP is greater than or equal to the first value (for example, −82 dBm) (step S207—YES), the connection management unit 206 outputs an instruction to change the belonging destination to the signal generation unit 205 (step S208). . The signal generation unit 205 generates a control signal including a Deauth signal transmission instruction based on the attribution change instruction output from the connection management unit 206 (step S209). The communication unit 201 transmits a control signal to the AP 10 to which the communication device 30 belongs (step S210). Thereafter, the connection management unit 206 updates the device information database (step S211). Specifically, the connection management unit 206 updates the belonging AP information item in the device information database with the information (AP 10 ID and RSSI) of the AP 10 selected in the process of step S202. In this case, the values registered in the data retransmission rate and packet retransmission rate items of the belonging AP information in the device information database are deleted. The ID and RSSI values registered in the attribute AP information item of the device information database before the update are registered in the adjacent AP information item.

  If the RSSI value of the neighboring AP is lower than the RSSI value of the belonging AP in the process of step S206 (step S206—NO), the connection management unit 206 outputs an instruction to release the attribution to the signal generation unit 205 ( Step S212). The signal generation unit 205 generates a control signal including a Deauth signal transmission instruction based on the attribution release instruction output from the connection management unit 206 (step S213). The communication unit 201 transmits a control signal to the AP 10 to which the communication device 30 belongs (step S214). Thereafter, the connection management unit 206 updates the device information database (step S215). Specifically, the connection management unit 206 deletes the record 50 of the device information database corresponding to the communication device 30 belonging to the AP 10 to which the control signal is transmitted in the process of step S214.

  7 and 8 are sequence diagrams showing a flow of operations of the connection control system 100 in the present embodiment. In the description of FIGS. 7 and 8, the number of APs 10 is two (APs 10-1 and 10-2). In order to distinguish the functional units included in the APs 10-1 and 10-2, in the description of FIGS. 7 and 8, the AP 10-1 includes the first communication unit 1011, the control unit 1021, the management frame transmission unit 1031, and the communication state notification unit 1041. The second communication unit 1051, the connection control unit 1061, and the signal generation unit 1071, and the AP 10-2 includes the first communication unit 1012, the control unit 1022, the management frame transmission unit 1032, the communication state notification unit 1042, and the second communication unit 1052. It is assumed that a connection control unit 1062 and a signal generation unit 1072 are provided. Further, at the start of processing, the communication device 30 does not belong to any AP 10.

The communication device 30 transmits a probe request to the AP 10-1 (Step S301). The communication device 30 transmits a probe request to the AP 10-2 (step S302).
The first communication unit 1011 of the AP 10-1 receives the probe request transmitted from the communication device 30. The control unit 1021 acquires the RSSI when the probe request is received. The management frame transmission unit 1031 assigns the acquired RSSI value to the received probe request via the second communication unit 1051 and transmits it to the control server 20 (step S303).

The first communication unit 1012 of the AP 10-2 receives the probe request transmitted from the communication device 30. The control unit 1022 acquires the RSSI when the probe request is received. The management frame transmission unit 1032 attaches the acquired RSSI value to the received probe request via the second communication unit 1052 and transmits it to the control server 20 (step S304).
The communication unit 201 of the control server 20 receives the probe request transmitted from the AP 10-1 and the AP 10-2. Since the signal received by the communication unit 201 is a management frame, the reading unit 202 outputs the received probe request to the determination unit 204.

  The determining unit 204 determines the AP 10 to which the communication device 30 belongs based on the RSSI assigned to the probe request output from the reading unit 202 (step S305). For example, the determination unit 204 determines the AP 10 to which the communication device 30 belongs as the AP 10-2. The determination unit 204 outputs the determined AP 10 information (for example, the MAC address of the AP 10-2) and a probe response transmission instruction to the signal generation unit 205. Further, the determination unit 204 registers the information of the communication device 30 that has determined the attribution destination in the device information database. The signal generation unit 205 generates a control signal based on the AP 10 information (for example, the MAC address of the AP 10-2) output from the determination unit 204 and the probe response transmission instruction (step S306). The communication unit 201 transmits the generated control signal to the AP 10-2 (Step S307).

  The second communication unit 1052 of the AP 10-2 receives the control signal transmitted from the control server 20. The second communication unit 1052 outputs the received control signal to the connection control unit 1062. The connection control unit 1062 controls the connection between the own device and the communication device 30 in accordance with the instruction stored in the control signal. Since the instruction stored in the control signal is a probe response transmission instruction, the connection control unit 1062 instructs the signal generation unit 1072 to generate a probe response. The signal generation unit 1072 transmits a probe response according to the control of the connection control unit 1062. The first communication unit 1012 transmits the generated probe response to the communication device 30 (step S308).

The communication device 30 receives the probe response transmitted from the AP 10-2 (Step S309). Upon receiving the probe response, the communication device 30 performs authentication with the AP 10-2. Specifically, the communication device 30 performs authentication according to an authentication method (for example, a password) set in advance with the AP 10-2. When the authentication is completed, the communication device 30 transmits an association request to the AP 10-2 (Step S310).
The first communication unit 1012 of the AP 10-2 receives the association request transmitted from the communication device 30. The first communication unit 1012 transmits an association response to the communication device 30 as a response to the received association request (step S311). Thereby, connection with AP10-2 and the communication apparatus 30 is completed.

  Thereafter, communication is performed between the AP 10-2 and the communication device 30 (step S312). The communication device 30 transmits data to the AP 10-2 (step S313). The first communication unit 1012 of the AP 10-2 receives the data transmitted from the communication device 30. The control unit 1022 acquires the RSSI value when the signal is received. In addition, the control unit 1022 acquires a data retransmission rate and a packet retransmission rate during communication with the communication device 30. The control unit 1022 outputs the acquired MAC address, RSSI, data retransmission rate, and packet retransmission rate values of the communication device 30 to the communication state notification unit 1042. The communication state notification unit 1042 notifies the control server 20 of communication state information including the output MAC address, RSSI, data retransmission rate, and packet retransmission rate values (step S314).

  The communication unit 201 of the control server 20 receives the communication state information transmitted from the AP 10-2. Since the signal received by the communication unit 201 is not a management frame, the reading unit 202 stores communication state information in the device information database. Specifically, the reading unit 202 acquires each value of the MAC address, RSSI, data retransmission rate, and packet retransmission rate from the communication state information. The reading unit 202 uses the acquired MAC address as a key and the values recorded in the items of RSSI, data retransmission rate, and packet retransmission rate of the belonging AP information in the device information database, and acquires the acquired RSSI, data retransmission rate, and packet retransmission. Update with rate values.

  Further, the data addressed to the AP 10-2 transmitted from the communication device 30 is also received by the AP 10-1 (step S315). In this case, the control unit 1021 of the AP 10-1 acquires the RSSI value when the signal is received. The control unit 1021 outputs the acquired MAC address and RSSI values of the communication device 30 to the communication state notification unit 1041. The communication state notification unit 1041 notifies the control server 20 of communication state information including the output MAC address and each value of RSSI (step S316).

  The communication unit 201 of the control server 20 receives the communication state information transmitted from the AP 10-2. Since the signal received by the communication unit 201 is not a management frame, the reading unit 202 stores communication state information in the device information database. Specifically, the reading unit 202 acquires each value of the MAC address and RSSI from the communication state information. Using the acquired MAC address as a key, the reading unit 202 updates the value recorded in the RSSI item of the adjacent AP information in the device information database with the acquired RSSI value. Thereafter, the processes in steps S313 to S316 are repeatedly performed each time data is transmitted from the communication device 30.

  The connection management unit 206 confirms the communication state of the communication device 30 by referring to the device information database periodically (step S317). As a result of checking the communication state of the communication device 30, if the communication status between the communication device 30 and the AP 10-2 is bad, the connection management unit 206 outputs a Deauth signal transmission instruction to the signal generation unit 205. The signal generation unit 205 generates a control signal including a Deauth signal transmission instruction (step S318). The communication unit 201 transmits the generated control signal to the AP 10-2 (Step S319).

  The second communication unit 1052 of the AP 10-2 receives the control signal transmitted from the control server 20. The second communication unit 1052 outputs the received control signal to the connection control unit 1062. The connection control unit 1062 controls the connection between the own device and the communication device 30 in accordance with the instruction stored in the control signal. Since the instruction stored in the control signal is an instruction to transmit a Deauth signal, the connection control unit 1062 instructs the signal generation unit 1072 to generate a Deauth signal. The signal generation unit 1072 generates a Deauth signal under the control of the connection control unit 1062. The first communication unit 1012 transmits the generated Deauth signal to the communication device 30 (step S320). Thereby, connection with AP10-2 and the communication apparatus 30 is cancelled | released.

The communication device 30 transmits a probe request to the AP 10-1 (Step S321). In addition, the communication device 30 transmits a probe request to the AP 10-2 (step S322).
The first communication unit 1011 of the AP 10-1 receives the probe request transmitted from the communication device 30. The control unit 1021 acquires the RSSI when the probe request is received. The management frame transmission unit 1031 assigns the acquired RSSI value to the received probe request via the second communication unit 1051 and transmits it to the control server 20 (step S323).

The first communication unit 1012 of the AP 10-2 receives the probe request transmitted from the communication device 30. The control unit 1022 acquires the RSSI when the probe request is received. The management frame transmission unit 1032 attaches the acquired RSSI value to the received probe request via the second communication unit 1052, and transmits it to the control server 20 (step S324).
The communication unit 201 of the control server 20 receives the probe request transmitted from the AP 10-1 and the AP 10-2. Since the signal received by the communication unit 201 is a management frame, the reading unit 202 outputs the received probe request to the determination unit 204.

  The determining unit 204 determines the AP 10 to which the communication device 30 belongs based on the RSSI assigned to the probe request output from the reading unit 202 (step S325). For example, the determination unit 204 determines the AP 10 to which the communication device 30 belongs as the AP 10-1. The determination unit 204 outputs the determined AP 10 information (for example, the MAC address of the AP 10-1) and a probe response transmission instruction to the signal generation unit 205. Further, the determination unit 204 registers the information of the communication device 30 that has determined the attribution destination in the device information database. The signal generation unit 205 generates a control signal based on the AP 10 information (for example, the MAC address of the AP 10-1) output from the determination unit 204 and the probe response transmission instruction (step S326). The communication unit 201 transmits the generated control signal to the AP 10-2 (Step S327).

  The second communication unit 1051 of the AP 10-1 receives the control signal transmitted from the control server 20. The second communication unit 1051 outputs the received control signal to the connection control unit 1061. The connection control unit 1061 controls the connection between the own device and the communication device 30 in accordance with an instruction stored in the control signal. Since the instruction stored in the control signal is a probe response transmission instruction, the connection control unit 1061 instructs the signal generation unit 1071 to generate a probe response. The signal generation unit 1071 transmits a probe response according to the control of the connection control unit 1061. The first communication unit 1011 transmits the generated probe response to the communication device 30 (step S328).

The communication device 30 receives the probe response transmitted from the AP 10-1 (Step S329). Upon receiving the probe response, the communication device 30 performs authentication with the AP 10-1. Specifically, the communication device 30 performs authentication according to an authentication method (for example, a password) set in advance with the AP 10-1. When the authentication is completed, the communication device 30 transmits an association request to the AP 10-1 (Step S330).
The first communication unit 1011 of the AP 10-1 receives the association request transmitted from the communication device 30. The 1st communication part 1011 transmits an association response to the communication apparatus 30 as a response of the received association request (step S331). Thereby, connection with AP10-1 and the communication apparatus 30 is completed. Thereafter, communication is performed between the AP 10-2 and the communication device 30 (step S332).

  According to the connection control system 100 configured as described above, the control server 20 that controls the AP 10 determines the AP 10 to which the communication device 30 belongs. Specifically, the AP 10 that has received the probe request transmitted from the communication device 30 transmits the received probe request to the control server 20. The control server 20 determines the AP 10 to which the communication device 30 belongs based on the RSSI given to the probe request received from each AP 10. Therefore, compared with the case where the AP 10 to which the communication device 30 belongs is determined, the possibility that a plurality of communication devices 30 are connected to a specific AP 10 can be reduced. Therefore, it is possible to suppress a decrease in communication efficiency of the entire system.

  In addition, during communication between the AP 10 and the communication device 30, the control server 20 has a good communication environment of the communication device 30 based on the data retransmission rate and the packet retransmission rate as well as the RSSI value of the currently belonging AP 10. Judge the wrong. If the communication environment of the AP 10 to which the communication device 30 currently belongs is poor, the change of the belonging destination is dynamically performed. As a result, it is possible to suppress a decrease in communication efficiency due to a plurality of communication devices 30 belonging to a specific AP 10. Further, when the communication environment of the AP 10 is poor, it is possible to prevent the communication apparatus 30 that is currently belonging from belonging to the AP 10 having a poor communication environment from belonging. Therefore, collision of packets can be suppressed and communication efficiency of the entire system can be improved.

<Modification>
In the present embodiment, the connection control system 100 is configured to include two APs 10-1 to 10-2, but the connection control system 100 may be configured to include three or more APs 10. In the present embodiment, the connection control system 100 is configured to include one communication device 30, but the connection control system 100 may be configured to include two or more communication devices 30.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes designs and the like that do not depart from the gist of the present invention.

10 (10-1, 10-2) ... AP, 20 ... control server, 30 ... communication device, 40 ... network, 101 ... first communication unit, 102 ... control unit, 103 ... management frame transmission unit, 104 ... communication state Notification unit, 105 ... second communication unit, 106 ... connection control unit, 107 ... signal generation unit, 201 ... communication unit, 202 ... reading unit, 203 ... device information storage unit, 204 ... determination unit, 205 ... signal generation unit, 206: Connection management unit

Claims (6)

A connection control system comprising: a relay device that communicates with a communication device; and a control server that controls connection between the relay device and the communication device,
The relay device is
A management frame transmission unit that transmits the management frame transmitted from the communication device to the control server;
A connection control unit that controls connection with the communication device in response to a response instruction to the management frame transmitted from the control server;
With
The control server
When a management frame is received, a determination unit that determines a relay device to which the communication device belongs based on a radio wave condition of the relay device that exists in the vicinity of the communication device that is the transmission source of the management frame;
A communication unit that transmits a control signal including a response instruction to the management frame to the determined relay device;
A connection control system comprising: The relay device further includes a communication state notification unit that periodically notifies the control server of information related to a communication state with the communication device in communication,
The control server further includes a connection management unit that dynamically changes an attribution destination of the communication device based on the notified information on the communication state,
When the condition indicating that the communication state is bad is satisfied, the connection management unit sets a relay device having a better radio wave condition than the relay device to which the communication device belongs as a relay device to which the communication device belongs. The connection control system according to claim 1, wherein the connection control system is changed.   The connection control system according to claim 1, wherein the communication unit does not transmit the control signal when a condition indicating that the determined radio wave condition of the relay device is poor is satisfied. A control server that controls connection between a relay device that communicates with a communication device and the communication device,
When a management frame transmitted from the communication device is received via the relay device, the communication device is attributed based on a radio wave condition of the relay device existing around the communication device that is the transmission source of the management frame. A determination unit for determining a relay device to be a destination;
A communication unit that transmits a control signal including a response instruction to the management frame to the determined relay device;
A control server comprising: A connection control method in a connection control system comprising: a relay device that communicates with a communication device; and a control server that controls connection between the relay device and the communication device,
A management frame transmission step in which the relay device transmits a management frame transmitted from the communication device to the control server;
A connection control step in which the relay device controls connection with the communication device in response to a response instruction to the management frame transmitted from the control server;
When the management server receives the management frame, the control server determines the relay device to which the communication device belongs based on the radio wave condition of the relay device existing around the communication device that is the transmission source of the management frame. A decision step;
A communication step in which the control server transmits a control signal including a response instruction to the management frame to the determined relay device;
A connection control method. As a connection control system comprising a relay device that communicates with a communication device and a control server that controls connection between the relay device and the communication device, a first computer corresponding to the relay device and a first computer corresponding to the control server A computer program for operating two computers,
For the first computer,
A management frame transmission step of transmitting a management frame transmitted from the communication device to the control server;
A connection control step for controlling connection with the communication device in response to a response instruction to the management frame transmitted from the control server;
And execute
For the second computer,
When a management frame is received, a determination step of determining a relay device to which the communication device belongs, based on a radio wave condition of the relay device existing around the communication device that is the transmission source of the management frame;
A communication step in which the control server transmits a control signal including a response instruction to the management frame to the determined relay device;
A computer program for running.

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