JP2006100970A - Communication terminal, wireless lan system, and communication method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wireless LAN system 10, wherein a communication terminal 18 can calculate an SSID corresponding to an access point 16 to which the communication terminal 18 should belong, without storing the SSID of the installed access point 16. <P>SOLUTION: In the wireless LAN system 10 provided with a plurality of access points 16 and the communication terminal 18, each of the access points 16 includes an SSID calculation section 182 for calculating a plurality of SSIDs whose values differ from each other on the basis of a predetermined rule; an affiliation trial section 184 for sequentially transmitting an affiliation request, respectively corresponding to a plurality of the calculated SSIDs to a nearby access point 16; and a communication frame transmitting/receiving section 186 for transmitting and receiving a communication frame to the access point 16, by using the SID corresponding to an affiliation permission response, when receiving the affiliation permission response returned by the access point 16 in response to any of a plurality of the affiliation requests being transmitted sequentially. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a technology for performing communication based on a wireless LAN standard.

  In a wireless LAN system, when a communication terminal performs communication via an access point, the communication terminal specifies identification information called SSID (Service Set ID), identifies the access point, and participates in the wireless LAN system. This SSID is identification information for participating in the wireless LAN system, and the access point sets the same SSID as the SSID used by the access point as one of the conditions. Allow participation in the wireless LAN system via points.

  In the wireless LAN system, by setting a plurality of groups having at least one access point, assigning different SSIDs to each group, and setting the same SSID as the SSID of a specific group in the communication terminal The communication terminal can belong to only a specific group. Thereby, for example, the communication terminals to which each department belongs can be limited. Furthermore, terminals used by equipment managers and executives store a plurality of SSIDs corresponding to a plurality of departments, and switching between the plurality of stored SSIDs enables communication across a plurality of departments. (For example, refer patent document 1).

JP 2004-7120 A

  However, when a plurality of SSIDs corresponding to a plurality of groups are set in the communication terminal as described above, the SSID of the group to which each terminal belongs is assigned when the number of groups is large or when a group to which the group belongs is newly added. It was necessary to register and it took time and effort.

  Accordingly, an object of the present invention is to provide a wireless LAN system, a communication terminal, and a communication method that can solve the above-described problems. For example, it is not necessary to individually register identification information corresponding to a plurality of groups in the communication terminal.

  In order to solve the above problems, the communication terminal of the present invention calculates a plurality of identification information, which is one of the conditions for belonging to an access point, based on a predetermined rule, and the plurality of calculated identification information The communication with the access point is tried using each of the above.

  For example, a communication terminal that performs communication based on a protocol defined by a wireless LAN, and a plurality of pieces of identification information that is one of the conditions for the communication terminal to belong to an access point based on a predetermined rule. An identification information calculation unit to be calculated, an affiliation request transmission unit that sequentially transmits to the access point an affiliation request that includes each of the plurality of identification information calculated by the identification information calculation unit, and a plurality of affiliation requests that are transmitted by the affiliation request transmission unit A communication terminal comprising: a data communication unit that transmits and receives a communication frame to and from the access point that has transmitted the affiliation permission response when the affiliation permission response is received from the access point provide.

  According to the present invention, since the values of a plurality of identification information such as SSIDs are not stored in the communication terminal, the calculation rules are stored, and the identification information is generated from the stored calculation rules. The amount can be reduced. Furthermore, when providing a new group, by setting an access point for new identification information corresponding to the provided new group within the range of the identification information value calculated by the identification information calculation unit, a plurality of communication terminals Each can quickly start communication with an access point belonging to a new group without setting identification information corresponding to the new group.

  Hereinafter, embodiments of the present invention will be described.

  FIG. 1 shows a configuration of a wireless LAN system 10 according to the first embodiment of the present invention. The wireless LAN system 10 includes a network 12, a plurality of access points 16, and a plurality of communication terminals 18. Each of the plurality of communication terminals 18-1, 18-2, and 18-3 is an IP (Internet Protocol) telephone, a PDA (Personal Digital Assistant), a PC (Personal Computer), or the like, and is a protocol defined for a wireless LAN. Is a terminal communicable via any one of the access points 16-1, 16-2, and 16-3.

  The access point 16-1 has a communication area 14-1 that is a range in which a radio wave having a sufficient strength to perform communication based on a wireless LAN. Similarly, access points 16-2 and 16-3 have communication areas 14-2 and 14-3, respectively. Each of the plurality of access points 16 is provided at a different location, and provides a service for relaying communication based on the wireless LAN at each location. In this example, access points 16-1, 16-2, and 16-3 are assigned 13, 21, and 26 as SSID values, respectively. Each of the plurality of access points 16 is connected to each other via a network 12 that is a wired network such as an in-house LAN.

  When each of the plurality of access points 16 receives an affiliation request from any of the plurality of communication terminals 18, the SSID value included in the affiliation request is the same as the SSID value set for itself. As one of them, the affiliation of the communication terminal 18 that has transmitted the affiliation request is permitted. In this way, by assigning different SSID values to the plurality of access points 16 provided in different places, only the communication terminal 18 having the same SSID value as the SSID value of each access point 16 can be accessed. It is possible to receive a service of performing communication based on a wireless LAN in a place where the is provided.

  FIG. 2 is a block diagram illustrating an example of the configuration of the access point 16. The access point 16 includes an affiliation control unit 160 and a communication frame relay unit 162. The affiliation control unit 160 stores the SSID value assigned to the access point 16, and when the affiliation request is received from the communication terminal 18, the SSID value included in the received affiliation request is the stored SSID value. It is determined whether or not it matches. When the received SSID value matches the stored SSID value, the affiliation control unit 160 indicates that the affiliation is permitted and the communication terminal having the SSID value that matches the parameters necessary for communication based on the wireless LAN. 18 and the terminal identification information such as the MAC address of the communication terminal 18 having the same SSID value is notified to the communication frame relay unit 162. The communication frame relay unit 162 stores the terminal identification information notified from the affiliation control unit 160, and stores the terminal identification information included in the received communication frame when the communication frame is received from the communication terminal 18. The terminal identification information is compared, and if both match, the received communication frame is relayed.

  FIG. 3 is a block diagram illustrating an example of the configuration of the communication terminal 18. The communication terminal 18 includes a calculation rule storage unit 180, an SSID calculation unit 182, an affiliation trial unit 184, and a communication frame transmission / reception unit 186. The calculation rule storage unit 180 stores SSID value calculation rules such as “initial value 0, maximum value 39, and increasing the SSID value by 1 from the initial value to the maximum value”.

  The SSID calculation unit 182 calculates a plurality of SSID values based on the calculation rules stored in the calculation rule storage unit 180. The affiliation trial unit 184 transmits an affiliation request to the nearest access point 16 based on each of the SSID values calculated by the SSID calculation unit 182. Then, in response to any of the transmitted plurality of membership requests, when parameters necessary for communication based on the membership permission and the wireless LAN are received from the access point 16, the received wireless LAN parameters are transmitted to the communication frame transmission / reception unit 186. Send to. The communication frame transmission / reception unit 186 transmits / receives a communication frame to / from the access point 16 based on a protocol defined for the wireless LAN based on the wireless LAN parameters received from the affiliation trial unit 184.

  FIG. 4 is a sequence diagram illustrating an example of operations of the access point 16 and the communication terminal 18. First, the affiliation trial unit 184 sequentially transmits affiliation requests to the nearest access point 16 based on each of the SSID values calculated by the SSID calculation unit 182 (S100). In this example, the SSID calculation unit 182 has 40 SSID values from 0 to 39 based on a calculation rule that “the initial value is 0, the maximum value is 39, and the SSID value is incremented by 1 from the initial value to the maximum value”. Is calculated.

  Next, the affiliation control unit 160 sequentially compares the SSID value included in the affiliation request with the SSID value stored in itself for the affiliation request sequentially received from the affiliation trial unit 184. When the SSID value included in the received affiliation request matches the SSID value stored in the affiliation request, the affiliation control unit 160 indicates the affiliation permission and the parameters necessary for communication based on the wireless LAN. 18 and also notifies the communication frame relay unit 162 of the identification information of the communication terminal 18 that has transmitted the affiliation permission (S102). Next, the communication frame transmission / reception unit 186 transmits / receives a communication frame to / from the communication frame relay unit 162 based on the protocol defined for the wireless LAN based on the wireless LAN parameters received by the affiliation trial unit 184 ( S104).

  Thus, since the communication terminal 18 calculates the SSID value based on the stored calculation rule, it is not necessary to store a plurality of SSID values in the communication terminal 18 in advance. Therefore, when the communication terminal 18 can belong to the access point 16 corresponding to each of a plurality of SSIDs having different values, the amount of data stored in the communication terminal 18 can be reduced. In addition, since the SSID calculation unit 182 can calculate a relatively large number of SSID values with a small amount of data, the SSID calculation unit 182 calculates more types of SSID values than the types of SSID values actually assigned to the access point 16. be able to. Therefore, the calculation rules stored in the calculation rule storage unit 180 are changed to the respective communication terminals by increasing or decreasing the types of SSID values assigned to the access points 16 within the range of the types of SSID values calculated by the SSID calculation unit 182. The type of the SSID value assigned to the access point 16 can be increased or decreased without changing 18. Accordingly, the communication terminal 18 can quickly start communication with the access point 16 whose type of SSID value has been changed.

  Further, by storing different calculation rules for each communication terminal 18 in the calculation rule storage unit 180 of each communication terminal 18, even if the SSID value assignment environment for the plurality of access points 16 is the same, each communication terminal 18 The access points 16 to which 18 can belong can be restricted. For example, one communication terminal 18 stores a calculation rule “initial value 0, maximum value 19 and increments the SSID value by 1 from the initial value to the maximum value”, and the other communication terminal 18 stores “initial value 20, the maximum value 39, and the calculation rule “Increase the SSID value by 1 from the initial value to the maximum value” are stored. In the SSID value assignment environment shown in FIG. Can belong to the access point 16-1, but cannot belong to the access point 16-2 or 16-3 in the communication area 14-2 or 14-3. Similarly, the other communication terminal 18 can belong to the access point 16-2 or 16-3 when in the communication area 14-2 or 14-3, but is in the communication area 14-1. May not be able to belong to the access point 16-1.

  In step 102, the communication terminal 18 has received the notification of belonging permission from the access point 16 after transmitting all of the calculated SSID values. However, the present invention is not limited to this, and transmission for transmitting a belonging request is performed. It is also possible to separately provide a machine and a receiver for receiving a notification indicating the affiliation permission in the affiliation trial unit 184 so that the affiliation permission can be received simultaneously while transmitting the affiliation request. In this case, the affiliation trial unit 184 may stop transmitting the affiliation request at the stage of receiving the affiliation permission. In addition, the affiliation trial unit 184 may store the SSID value that has received the notification of affiliation permission in the past, and transmit the affiliation request in order from the SSID value in which the notification of affiliation permission has been received. As a result, the possibility that the affiliation process will be completed more quickly is increased, transmission of unnecessary affiliation requests is reduced, and an increase in traffic can be suppressed. Further, when the communication frequency is different for each access point 16, the communication terminal 18, for example, fixes the frequency, transmits all of the plurality of belonging requests to the access point 16, and detects a timeout with respect to the last transmitted belonging request. Then, the frequency may be changed, and a plurality of affiliation requests may be transmitted at the changed frequency, and all the affiliation requests may be transmitted for each frequency to be used and a response may be waited.

  The first embodiment of the present invention has been described above.

  As described above, according to the wireless LAN system 10 of the present embodiment, a plurality of SSIDs themselves are not stored in the communication terminal 18, but calculation rules are stored and SSIDs are generated from the stored calculation rules. The amount of data stored in the terminal 18 can be reduced. Further, when providing a new group, by setting a new SSID corresponding to the provided new group in the access point 16 within the range of the SSID value calculated by the SSID calculation unit 182, Communication based on the wireless LAN can be quickly started with the access point 16 belonging to the new group without newly setting an SSID value corresponding to the new group.

  Next, a second embodiment of the present invention will be described.

  FIG. 5 shows a configuration of a wireless LAN system 20 according to the second embodiment of the present invention. The wireless LAN system 20 includes a network 22, a plurality of access points 26, a plurality of communication terminals 28, a service control server 30, and a service providing device 32. Each of the plurality of communication terminals 28-1, 28-2, and 28-3 is an IP phone, a PDA, a PC, or the like, and the access points 26-1, 26-2 are based on a protocol defined in the wireless LAN. , And a terminal capable of communicating via any one of 26-3.

  The access point 26-1 has a communication area 24-1 that is a range in which a radio wave with sufficient strength to perform communication based on the wireless LAN. Similarly, access points 26-2 and 26-3 have communication areas 24-2 and 24-3, respectively. Each of the plurality of access points 26 is provided at a different location, and provides a service for relaying communication based on the wireless LAN at each location. In this example, access points 26-1, 26-2, and 26-3 are assigned 13, 21, and 26 as SSID values, respectively. Each of the plurality of access points 26 is connected to each other via a network 22 that is a wired network such as an in-house LAN.

  When each of the plurality of access points 26 receives an affiliation request from any of the plurality of communication terminals 28, the SSID value included in the affiliation request is the same as the SSID value set for itself. As one of the above, terminal identification information for identifying the communication terminal 28 that permits the affiliation of the communication terminal 28 that has transmitted the affiliation request and identifies the affiliation terminal 28 together with its own SSID value is provided via the network 22. Send to.

The service control server 30 stores a table in which a service provided for each SSID value is associated. The service control server 30 is connected to each of the plurality of access points 26 via the network 22, and together with the SSID value of the access point 26, the terminal identification information of the communication terminal 28 to which the access point 26 belongs belongs to the access point 26. When the service is received, the service corresponding to the received SSID value is extracted with reference to the table, and the extracted service is stored in association with the received terminal identification information. When a communication frame is received from the communication terminal 28 via the access point 26, the service control server 30 provides a corresponding service based on the terminal identification information included in the received communication frame. The service providing device 32 that transfers the communication frame to the network is connected to the service control server 30 and the plurality of access points 26 via the network 22 and is connected to a specific server, a server that performs QoS control, and the external Internet. Router. The service providing apparatus 32 receives the communication frame transferred from the service control server 30, processes the received communication frame based on the service provided by itself, and returns it to the communication terminal 28 that has transmitted the communication frame. In this example, only one service providing apparatus 32 is shown as an apparatus that provides one service. However, when the wireless LAN system 20 according to the present invention provides a plurality of services, the service providing apparatus 32 includes a plurality of services. There may be a plurality of services corresponding to each of the services, and one service providing apparatus 32 may have a function of providing a plurality of services.

  FIG. 6 is a block diagram illustrating an example of the configuration of the service control server 30. The service control server 30 includes a providing service information storage unit 300, a service control unit 302, and a service allocation table storage unit 304. The service allocation table storage unit 304 stores services such as permission for connection to the external Internet, QoS control, and permission for access to a server storing confidential information in association with SSID values.

  When the service control unit 302 receives the identification information of the communication terminal 28 together with the SSID value of the access point 26 to which the communication terminal 28 belongs, from the communication terminal 28 via any of the plurality of access points 26. Then, the service allocation table storage unit 304 is referred to, a service corresponding to the received SSID value is extracted, and the extracted service is associated with the terminal identification information received from the access point 26 in the provided service information storage unit 300. Store. When the service control unit 302 receives a communication frame from the communication terminal 28 via the access point 26, the service control unit 302 refers to the provided service information storage unit 300 and corresponds to the terminal identification information included in the received communication frame. The service to be provided to the communication terminal 28 is extracted from the providing service information storage unit 300. Then, the service control unit 302 transfers the received communication frame to the service providing apparatus 32 that provides the service based on the content of the extracted service.

  FIG. 7 is a block diagram illustrating an example of the configuration of the access point 26. The access point 26 includes an affiliation control unit 260 and a communication frame relay unit 262. The affiliation control unit 260 stores the SSID value assigned to the access point 26, and when the affiliation request is received from the communication terminal 28, the SSID value included in the received affiliation request is the stored SSID value. It is determined whether or not it matches. When the received SSID value matches the stored SSID value, the affiliation control unit 260 indicates the affiliation permission and the communication terminal having the SSID value that matches the parameters necessary for communication based on the wireless LAN. 28, and also notifies the communication frame relay unit 262 of the terminal identification information of the communication terminal 28 having the same SSID value. The communication frame relay unit 262 relays the communication frame from the communication terminal 28 having the terminal identification information notified from the affiliation control unit 260 to the service control server 30 based on the wireless LAN.

  FIG. 8 is a block diagram illustrating an example of the configuration of the communication terminal 28. The communication terminal 28 includes a calculation rule storage unit 280, an SSID calculation unit 282, an affiliation trial unit 284, and a communication frame transmission / reception unit 286. The calculation rule storage unit 280 stores SSID value calculation rules. The SSID calculation unit 282 calculates a plurality of SSID values based on the calculation rules stored in the calculation rule storage unit 280. The affiliation trial unit 284 transmits an affiliation request to the nearest access point 26 based on each of the SSID values calculated by the SSID calculation unit 282. Then, in response to one of the plurality of transmitted membership requests, when the parameters required for membership permission and communication based on the wireless LAN are received from the access point 26, the received wireless LAN parameters and membership are permitted. The SSID value is sent to the communication frame transmission / reception unit 286. The communication frame transmission / reception unit 286 transmits / receives a communication frame to / from the access point 26 based on a protocol defined for the wireless LAN based on the wireless LAN parameters received from the affiliation trial unit 284. At this time, the communication frame transmission / reception unit 286 transmits the SSID value permitted to belong to the service control unit 302 via the access point 26.

  FIG. 9 shows an example of the structure of data stored in the providing service information storage unit 300. The providing service information storage unit 300 stores the provided service type 3002 in association with the terminal identification information 3000 such as an IP address. By referring to the providing service information storage unit 300, the service control unit 302 selects the received communication frame based on the terminal identification information included in the communication frame received from the communication terminal 28 via the access point 26. It can be determined whether or not to transfer to the service providing apparatus 32.

  When providing each service record, the service-in-service information storage unit 300 stores the stored time together with each record, and deletes the record after a predetermined time has elapsed from the service-in-service information storage unit 300. May be. Thereby, when the communication terminal 28 roams to another access point 26, the corresponding record can be deleted, so that the storage capacity required for the access point 26 can be reduced.

  FIG. 10 shows an example of the structure of data stored in the service control unit 302. The service allocation table storage unit 304 stores the provided service type 3042 in association with the SSID 3040. As described above, the communication terminal 28 in the communication area 24 of the access point 26 with SSID = 13 can receive the service of “performing QoS control”, while “connection to the external Internet” or “management” Unable to receive the service "Access to Planning Department Server". Thereby, the service corresponding to the SSID of the access point 26 can be provided only to the communication terminal 28 in the communication area 24 of the access point 26.

  FIG. 11 is a sequence diagram illustrating an example of operations of the access point 26, the communication terminal 28, and the service control server 30. First, the affiliation trial unit 284 sequentially transmits affiliation requests to the nearest access point 26 based on each of the SSID values calculated by the SSID calculation unit 282 (S200). Next, the affiliation control unit 260 sequentially compares the SSID values included in the affiliation request with the SSID values stored in the affiliation request in response to the affiliation requests sequentially received from the affiliation trial unit 284. If the SSID value included in the received affiliation request matches the SSID value stored by itself, the affiliation control unit 260 transmits the parameters necessary for communication based on the affiliation permission and the wireless LAN to the communication terminal 28. At the same time, the communication frame relay unit 262 is notified of the identification information of the communication terminal 28 that has transmitted the affiliation permission (S202). Then, the communication frame transmission / reception unit 286 transmits the SSID value of the access point 26 to which the affiliation is permitted together with its own terminal identification information to the service control server 30 via the network 22 (S204).

  Next, the service control unit 302 refers to the service allocation table storage unit 304, extracts a service corresponding to the received SSID value, and associates the extracted service with the terminal identification information received from the access point 26. The service information is stored in the providing service information storage unit 300 (S206).

  Next, the communication frame transmission / reception unit 286 transmits a communication frame to the communication frame relay unit 262 based on a protocol defined for the wireless LAN based on the wireless LAN parameters received by the affiliation trial unit 284 ( S208). The communication frame relay unit 262 transfers the communication frame received from the communication frame transmission / reception unit 286 to the service control server 30 via the network 22 (S210). The service control unit 302 extracts terminal identification information from the received communication frame (S212), refers to the provided service information storage unit 300, extracts a service corresponding to the extracted terminal identification information, and selects a corresponding service. The communication frame is transferred to the service providing apparatus 32 to be provided (S214). Then, the communication terminal 28 performs communication based on the service provided by the service providing apparatus 32 with the corresponding service providing apparatus 32 via the access point 26 (S216).

  In the first and second embodiments, when the affiliation is permitted, the communication frame transmission / reception unit 286 displays the SSID value of the access point 26 to which the affiliation is permitted, together with its own terminal identification information, as a communication frame relay unit. Although it transmits to the service control server 30 via 262, this invention is not limited to this. As another example, the affiliation control unit 260, when the SSID value received from the affiliation trial unit 284 matches the SSID value stored by itself, the terminal identification information of the communication terminal 28 that has transmitted the affiliation request, You may transmit to the service control server 30 via the network 22 with own SSID. Thus, after belonging to an access point 26 having an SSID value for which provision of a specific service is not permitted, an SSID value different from the SSID value of the belonging access point 26 is transmitted to the service control server 30. It is possible to prevent the communication terminal from receiving unauthorized service provision.

  Each functional block of the access point 16, the communication terminal 18, and the service control server 30 described above is executed in hardware by an integrated logic IC such as an application specific integrated circuit (ASIC) or a field programmable gate array (FPGA). Or may be realized by software by a DSP (Digital Signal Processor) or a general-purpose computer.

  In the first and second embodiments, the SSID is taken as an example of the condition for the communication terminal to belong to the access point. However, the present invention is not limited to this.

  As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in embodiment mentioned above. It will be apparent to those skilled in the art that various modifications or improvements can be made to the above-described embodiment. Furthermore, it is apparent from the scope of the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

1 is a diagram illustrating a configuration of a wireless LAN system 10 according to a first embodiment of the present invention. 2 is a block diagram illustrating an example of a configuration of an access point 16. FIG. 3 is a block diagram illustrating an example of a configuration of a communication terminal 18. FIG. 4 is a sequence diagram illustrating an example of operations of an access point 16 and a communication terminal 18. FIG. It is a figure which shows the structure of the wireless LAN system 20 which concerns on 2nd Embodiment of this invention. 2 is a block diagram illustrating an example of a configuration of a service control server 30. FIG. 2 is a block diagram illustrating an example of a configuration of an access point 26. FIG. 3 is a block diagram illustrating an example of a configuration of a communication terminal 28. FIG. FIG. 4 is a diagram illustrating an example of a structure of data stored in a service information storage unit 300 being provided. It is a figure which shows an example of the structure of the data stored in the service allocation table storage part. 4 is a sequence diagram showing an example of operations of an access point 26, a communication terminal 28, and a service control server 30. FIG.

Explanation of symbols

10, 20 ... Wireless LAN system, 12, 22 ... Network, 14, 24 ... Communication area, 16, 26 ... Access point, 160, 260 ... Affiliation control unit, 162, 262 ..Communication frame relay unit, 18, 28 ... communication terminal, 180,280 ... calculation rule storage unit, 182,282 ... SSID calculation unit, 184,284 ... affiliation trial unit, 186,286 ... Communication frame transmission / reception unit, 30 ... Service control server, 300 ... Provided service information storage unit, 3000 ... Terminal identification information, 3002 ... Provided service type, 302 ... Service control unit 304 ... service allocation table storage unit, 3040 ... SSID, 3042 ... provided service type, 32 ... service providing apparatus

Claims (5)

A communication terminal that performs communication based on a protocol defined by a wireless LAN,
Based on a predetermined rule, an identification information calculation unit that calculates a plurality of identification information that is one of the conditions for the communication terminal to belong to the access point;
An affiliation request transmitter that sequentially transmits to the access point an affiliation request that includes each of the plurality of identification information calculated by the identification information calculator;
When a affiliation permission response is received from the access point in response to any of the plurality of affiliation requests transmitted by the affiliation request transmission unit, a communication frame is transmitted with the access point that has transmitted the affiliation permission response. A communication terminal comprising a data communication unit for transmitting and receiving. The communication terminal according to claim 1,
The identification information calculation unit
A communication terminal characterized by calculating a larger number of identification information than the number of identification information allocated to each of the plurality of access points. The communication terminal according to claim 1 or 2,
The identification information is an SSID (Service Set ID). A wireless LAN system comprising a plurality of access points and a communication terminal that communicates with any of the plurality of access points using a protocol defined by the wireless LAN,
The plurality of access points are:
It is divided into a plurality of groups including one or more access points, and each of the plurality of groups is identification information that is one of the conditions for the communication terminal to belong to an access point, and has different values The identification information is assigned,
The communication terminal is
Based on a predetermined rule, an identification information calculation unit that calculates a plurality of the identification information having different values;
An affiliation request transmitter that sequentially transmits to the nearest access point an affiliation request that includes each of the plurality of identification information calculated by the identification information calculator;
In response to any of the plurality of affiliation requests transmitted by the affiliation request transmission unit, when a affiliation permission response is received from the access point, a communication frame is transmitted with the access point that has transmitted the affiliation permission response. A wireless LAN system comprising: a data communication unit that transmits and receives data. A communication method in a communication terminal that performs communication based on a protocol defined by a wireless LAN,
Calculating a plurality of identification information, which is one of the conditions for the communication terminal to belong to an access point, based on a predetermined rule;
Sequentially transmitting a membership request including each of the calculated plurality of identification information to the nearest access point;
In response to any of a plurality of membership requests, when a membership permission response is received from the access point, a step of transmitting and receiving a communication frame with the access point that has transmitted the membership permission response is performed. A characteristic communication method.

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