JP2005094656A - Wireless lan terminal and connection establishment method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wireless terminal whose electric power consumption can be reduced. <P>SOLUTION: The wireless LAN terminal 10 is equipped with an identification data storage section107 for storing identification data in which a second identification symbol (SSID) is associated with a identification symbol (BSSID), a notification signal receiving section 101 for receiving notification signals, an identification data searching section 102 for searching the identification data based on the first identification symbol to specify the identification data, an identification data specifying section 103 that selects a specific second identification symbol from among a prior second identification group when no identification data exists and specifies the second identification symbol contained in the identification data when the identification data exist, a request signal transmission section 104 for transmitting request signals (Probe Request), a response signal receiving section 105 for receiving response signals (Probe Response), and an identification data register section 106 for storing the identification data in the identification data storage section 107 when the response signals are received. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a wireless LAN terminal and a connection establishment method.

  In recent years, wireless LAN technology has become widespread as a technology for connecting to a network such as the Internet without using a communication cable in an information terminal such as a personal computer. In the wireless LAN technology standardized by IEEE std 802.11, which is most commonly used at present, the establishment of a connection between an information terminal and a device serving as a wireless LAN connection point called a so-called access point is as follows. It has become common to do this.

First, in order to request a connection from an information terminal to an access point, a connection request signal (Probe Request) including a code for identifying a wireless LAN network called SSID (also referred to as E-SSID) is transmitted. On the other hand, the access point that receives the probe request transmits a connection response signal (probe response) that permits the connection when it matches the SSID managed by the access point, and then the connection is established. Data communication is started between the terminal and the access point (see, for example, Non-Patent Document 1). This code called SSID is included in the beacon signal and periodically transmitted by the access point, so that it can be easily connected to the access point by detecting this beacon signal at the information terminal.
Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications, ANSI / IEEE Std 802.11, 1999 Edition

  Recently, however, many access points having a function of transmitting a beacon signal not including an SSID have been commercialized in order to ensure security. In order to connect to such an access point, it is necessary to check the SSID in advance and set it to the terminal. Therefore, when a plurality of wireless LAN networks are switched and used, it is necessary to set the SSID each time, which greatly reduces the convenience for the user. On the other hand, a function for automatically transmitting a probe request using a plurality of SSIDs pre-registered in a terminal is provided in an operation system (OS) or the like, but in this case, many unnecessary probe request signals are transmitted. Wasted power is consumed in the terminal.

  Accordingly, an object of the present invention is to provide a wireless LAN terminal and a connection establishment method capable of improving convenience when connecting to a plurality of wireless LAN networks and reducing power consumption.

  In order to solve the above problems, the present inventors have made various studies. The inventors of the present invention have focused on the fact that the access point identification information (BSSID) is included in the beacon signal transmitted from the access point. In other words, if the SSID used when connecting to the access point in the past can be stored as information associated with the access point, the connection form using that information when connecting to the same access point again Found that is possible. The present invention has been made based on these findings.

  The wireless LAN terminal of the present invention is a second identification for identifying a wireless LAN network to which a wireless LAN parent device belongs in a wireless LAN terminal that transmits and receives information to and from a wireless LAN parent device using wireless signals in a wireless LAN system. An identification information storage means for storing identification information associated with a first identification symbol for identifying the wireless LAN base unit, and a notification signal including the first identification symbol transmitted from the wireless LAN base unit. A notification signal receiving means; an identification information search means for searching for identification information stored in the identification information storage means based on a first identification symbol included in the notification signal; and identifying identification information including the first identification symbol; When the identification information including the first identification symbol included in the notification signal does not exist in the identification information storage unit, the first wireless LAN network to be preferentially connected is identified. When a specific second identification symbol is selected from the priority second identification group including the identification symbol and the identification information including the first identification symbol included in the notification signal exists in the identification information storage unit, the identification information Using the identification information specifying means for specifying the second identification symbol included in the information signal, and the first identification symbol included in the notification signal and the second identification symbol selected or specified by the identification information specifying means. A request signal transmitting means for transmitting a request signal for requesting a response, and a response signal for receiving a response signal indicating that connection is permitted from the wireless LAN base unit to the request signal transmitted by the request signal transmitting means When the response signal is received by the receiving means and the response signal receiving means, the second identification symbol selected or specified by the identification information specifying means is used as the first identification symbol included in the notification signal. Put communication and an identification information registration means for storing the identification information storage means as the identification information.

  The connection establishment method of the present invention is a connection establishment method in a wireless LAN terminal that transmits / receives information to / from a wireless LAN base unit using a wireless signal in a wireless LAN system, and the identification information storage means belongs to the wireless LAN base unit An identification information storing step in which a second identification symbol for identifying a wireless LAN network stores identification information associated with the first identification symbol for identifying the wireless LAN base unit; A notification signal receiving step for receiving a notification signal including a first identification symbol transmitted from the master unit, and an identification information search means stored in the identification information storage means based on the first identification symbol included in the notification signal An identification information search step for searching for information and specifying identification information including the first identification symbol, and an identification information specifying means include a first identification included in the notification signal If the identification information including the number does not exist in the identification information storage means, a specific second identification symbol is selected from the priority second identification group including the second identification symbol for identifying the wireless LAN network to be preferentially connected When the identification information including the first identification symbol included in the notification signal exists in the identification information storage means, an identification information specifying step for specifying the second identification symbol included in the identification information, and a request signal transmission means Is a request signal transmission step of transmitting a request signal for requesting connection to the wireless LAN base unit using the first identification symbol included in the notification signal and the second identification symbol selected or specified by the identification information specifying means. The response signal receiving means receives a response signal for indicating that the request signal transmitted by the request signal transmitting means is permitted to be connected from the wireless LAN base unit. And when the response signal is received by the response signal receiving unit, the identification information registering unit associates the second identification symbol selected or specified by the identification information specifying unit with the first identification symbol included in the notification signal. And an identification information registration step for storing the identification information in the identification information storage means.

  According to the wireless LAN terminal and the connection establishment method of the present invention, since the notification signal receiving means receives the notification signal including the first identification symbol from the wireless LAN base unit, the wireless LAN base unit that transmits the notification signal is specified. be able to. The identification information search means searches for identification information related to the wireless LAN base unit that has transmitted the notification signal, and the identification information specifying means obtains a second identification symbol for identifying the wireless LAN network to which the wireless LAN base unit belongs, The signal transmitting means transmits a request signal to the wireless LAN base unit based on the second identification symbol, the response signal receiving means receives the response signal from the wireless LAN base unit, and the identification information registration means is sent from the wireless LAN base unit. Since the identification information is stored based on the response, it is possible to easily reconnect to the wireless LAN base unit that has been successfully connected in the past, and it is possible to prevent transmission of useless request signals.

  The wireless LAN terminal of the present invention further comprises non-contact information storing means for storing non-contact information including a first identification symbol for identifying a wireless LAN base unit for which connection has not been established, and the request signal transmitting means comprises If the non-contact information including the first identification symbol included in the notification signal is present in the non-contact information storage means, the process ends without transmitting the request signal to the wireless LAN base unit, and the identification information registration means When the response signal is not received by the response signal receiving unit, it is also preferable to store the non-contact information including the first identification symbol included in the notification signal in the non-contact information storage unit. If the identification information registration means does not receive a response signal from the wireless LAN base unit, the contact information including the first identification symbol for identifying the wireless LAN base unit is stored, and the request signal transmission means stores the contact information in the contact information. Since the request signal is not transmitted to the wireless LAN base unit specified by the first identification symbol included, the request signal is not transmitted to the wireless LAN base unit that has failed to connect in the past. Can be prevented.

  In the wireless LAN terminal of the present invention, the priority second identification group includes a plurality of prioritized second identification symbols, and the identification information specifying means sequentially selects the second identification symbols having a higher priority, When the response signal is not received by the response signal receiving means within a predetermined time from the time when the request signal is transmitted, it is also preferable to select the second identification symbol having the next highest priority. Until the identification information specifying means receives the response signal, the second identification symbol is selected in accordance with the priority order, so that it is more efficient even when connecting to a wireless LAN base unit that has not been connected in the past. Connection can be made and transmission of useless request signals can be reduced.

  According to the wireless LAN terminal and the connection establishment method of the present invention, since the notification signal receiving means receives the notification signal including the first identification symbol from the wireless LAN base unit, the wireless LAN base unit that transmits the notification signal is specified. be able to. The identification information search means searches for identification information related to the wireless LAN base unit that has transmitted the notification signal, and the identification information specifying means obtains a second identification symbol for identifying the wireless LAN network to which the wireless LAN base unit belongs, The signal transmitting means transmits a request signal to the wireless LAN base unit based on the second identification symbol, the response signal receiving means receives the response signal from the wireless LAN base unit, and the identification information registration means is sent from the wireless LAN base unit. Since the identification information is stored based on the response, it is possible to easily reconnect to the wireless LAN base unit that has been successfully connected in the past, and it is possible to prevent transmission of useless request signals. As a result, it was possible to provide a wireless LAN terminal and a connection establishment method capable of improving convenience when connecting to a plurality of wireless LAN networks and reducing power consumption.

  A wireless LAN terminal according to an embodiment of the present invention will be described with reference to the drawings. In addition, in each figure, the same code | symbol is attached | subjected to the same element and the overlapping description is abbreviate | omitted.

  FIG. 1 is a configuration diagram of a wireless LAN system according to the present embodiment. As shown in FIG. 1, the wireless LAN system 1 according to the present embodiment includes a wireless LAN terminal 10, wireless LAN masters 201 to 20n, and wireless LAN networks 301 to 30n.

  The wireless LAN base units 201 to 20n are relay devices generally called access points, have a function of transmitting / receiving information to / from the wireless LAN terminal 10 using wireless signals, and are gateways to the wireless LAN networks 301 to 30n. It is a device that has the role of The wireless LAN master devices 201 to 20n periodically transmit beacon signals (notification signals). This beacon signal is used to notify the wireless LAN terminal 10 of the existence of the wireless LAN master devices 201 to 20n. This beacon signal includes a code BSSID (first identification symbol) for identifying the wireless LAN base units 201 to 20n that transmit the beacon signal. On the other hand, the beacon signal does not include a code SSID (second identification symbol) for identifying the wireless LAN networks 301 to 30n to which the wireless LAN master device that transmits the beacon signal is connected. The BSSID includes, for example, a part of the MAC address of the wireless LAN master devices 201 to 20n, so that the wireless LAN master devices 201 to 20n can be uniquely specified. By receiving the beacon signal in the wireless LAN terminal 10, the wireless LAN master devices 201 to 20n that can be connected can be uniquely specified.

  Hereinafter, in the present embodiment, the BSSIDs of the wireless LAN master devices 201 to 20n are described as “BSSID1” to “BSSIDn”, and the SSIDs of the wireless LAN networks 301 to 30n are described as “SSID1” to “SSIDn”.

  The wireless LAN terminal 10 according to the present embodiment is built in or connected to an information terminal (not shown) such as a personal computer, and other information connected to the information terminal and the wireless LAN networks 301 to 30n. In order to realize communication with a device (not shown), it is a device that transmits and receives wireless signals to and from the wireless LAN base units 201 to 20n. As shown in FIG. 1, the wireless LAN terminal 10 includes, as functional components, a notification signal receiving unit 101 (notification signal receiving unit), an identification information searching unit 102 (identification information searching unit), an identification An information identification unit 103 (identification information identification unit), a request signal transmission unit 104 (request signal transmission unit), a response signal reception unit 105 (response signal reception unit), an identification information registration unit 106 (identification information registration unit), , An identification information storage unit 107 (identification information storage unit), a priority identification information storage unit 108, and a non-contact information storage unit 109 (non-contact information storage unit).

  Subsequently, each component of the wireless LAN terminal 10 will be described in detail.

  The notification signal receiving unit 101 is a part that receives beacon signals transmitted from the wireless LAN base units 201 to 20n. The beacon signal includes a BSSID for identifying the wireless LAN base units 201 to 20n that transmitted the beacon signal. The notification signal receiving unit 101 has a function of searching for a beacon signal by automatically changing a wireless channel used when receiving the beacon signal. The wireless channel represents a frequency band of radio waves used when the wireless LAN terminal 10 transmits and receives wireless signals to and from the wireless LAN base units 201 to 20n. The broadcast signal receiving unit 101 outputs the BSSID included in the received beacon signal and the wireless channel information for specifying the wireless channel used when receiving the beacon signal to the identification information searching unit 102.

  The identification information search unit 102 is a part that searches the identification information stored in the identification information storage unit 107 based on the BSSID output from the notification signal reception unit 101. This identification information includes BSSID and SSID used in the past when connecting to the wireless LAN base units 201 to 20n.

  FIG. 2 is an example of a configuration diagram of data stored in the identification information storage unit 107. The identification information storage unit 107 stores identification information used when the wireless LAN terminal 10 is connected to the wireless LAN masters 201 to 20n in the past. In the identification information, the SSID used to identify the wireless LAN network to which the wireless LAN master devices 201 to 20n belong when the connection is established with the wireless LAN master devices 201 to 20n is the wireless LAN master device 201. Associated with BSSID identifying ~ 20n. According to the example of FIG. 2, it means that the connection is established using the wireless LAN master device 201 identified by BSSID = “BSSID1” and “SSID1” which is the SSID of the wireless LAN network 301.

  The identification information search unit 102 searches the identification information storage unit 107 and specifies identification information including a BSSID that matches the BSSID output from the notification signal reception unit 101. According to the example of FIG. 2, when the beacon signal of the wireless LAN base unit 201 is received by the notification signal receiving unit 101 and BSSID = 'BSSID1' is output, BSSID = 'BSSID1' and SSID = 'SSID1' The configured identification information is specified, and the identification information and radio channel information are output to the identification information specifying unit 103.

  Returning to FIG. 1, the identification information specifying unit 103 is a part that selects or specifies the SSID that identifies the wireless LAN networks 301 to 30 n based on the identification information output from the identification information search unit 102. When the identification information output from the identification information search unit 102 exists, the identification information specifying unit 103 specifies the BSSID and SSID included in the identification information. Thereafter, the BSSID, SSID, and radio channel information are output to the request signal transmission unit 104.

  On the other hand, when there is no identification information output from the identification information search unit 102, the identification information specifying unit 103 includes a plurality of items included in the priority SSID list (priority second identification group) stored in the priority identification information storage unit 108. Select a specific SSID from among the SSIDs. Thereafter, the BSSID, SSID, and radio channel information are output to the request signal transmission unit 104. The priority SSID list (priority second identification group) is information including one or more SSIDs of wireless LAN networks to be preferentially connected by the wireless LAN terminal 10 among the wireless LAN networks 301 to 30n. In this priority SSID list, priority order information indicating which SSID is preferentially used is associated with each SSID. FIG. 3 is an example of a configuration diagram of data stored in the priority identification information storage unit 108. According to the example of FIG. 3, SSID = ‘SSIDX’ is stored in the priority identification information storage unit 108 in association with priority information = ‘1’ indicating the priority of the SSID. The identification information specifying unit 103 first selects the SSID having the highest priority. After that, when a probe response is not received by the response signal receiving unit 105 (details will be described later) within a certain period of time after the probe request is transmitted by the request signal transmitting unit 104, the identification information specifying unit 103 determines that the Is output to the request signal transmission unit 104. According to the example of FIG. 3, when SSID = 'SSIDX' is first selected and no Probe Response is received within a certain time after transmitting a Probe Request using the SSID = 'SSIDX', the SSID with the next highest priority = The operation of selecting “SSIDY” and outputting it to the request signal transmission unit 104 is repeated.

  Returning to FIG. 1, the request signal transmission unit 104 is a part that transmits a request signal (hereinafter referred to as a probe request) for requesting connection to the wireless LAN base units 201 to 20n. First, the request signal transmission unit 104 searches the non-contact information storage unit 109 based on the BSSID output from the identification information specifying unit 103.

  FIG. 4 is an example of a configuration diagram of data stored in the non-contact information storage unit 109. According to the example of FIG. 4, the non-contact information storage unit 109 stores non-contact information when the wireless LAN terminal 10 is connected to the wireless LAN base units 201 to 20 n in the past. The non-contact information includes a plurality of BSSIDs for identifying the wireless LAN base units 201 to 20n that are not connected. According to the example of FIG. 4, it means that the connection with the wireless LAN master device 202 identified by BSSID = “BSSID2” has not been established.

  Returning to FIG. 1, when the request signal transmission unit 104 searches the non-contact information storage unit 109 and the BSSID output from the identification information specifying unit 103 exists as non-contact information in the non-contact information storage unit 109. Ends the process. On the other hand, if the BSSID output from the identification information specifying unit 103 does not exist as non-contact information in the non-contact information storage unit 109, a Probe Request is transmitted as follows. The probe request is transmitted using a radio channel that includes the BSSID and SSID output from the identification information specifying unit 103 and specified by the radio channel information output from the identification information specifying unit 103. The request signal transmission unit 104 outputs the SSID, BSSID, and radio channel information included in the probe request to the response signal reception unit 105.

  The response signal receiving unit 105 is a part that receives a probe response for indicating that the connection is permitted from the wireless LAN base units 201 to 20n in response to the probe request transmitted by the request signal transmitting unit 104. After the probe response is received, a connection between the wireless LAN terminal 10 and the wireless LAN masters 201 to 20n is established through a certain procedure. By establishing the connection, the wireless LAN terminal 10 exchanges data with other wireless LAN terminals and information devices (not shown) connected to the wireless LAN networks 301 to 30n via the wireless LAN masters 201 to 20n. It is possible to send and receive. The response signal receiving unit 105 outputs connection result information (OK / NG) indicating presence / absence of reception of Probe Response, and the SSID and BSSID to the identification information registration unit 106. When the connection result information is “OK”, it means that the Probe Request is received at a certain time after the Probe Request is transmitted. On the other hand, “NG” means that the Probe Request is not received within a certain time after the Probe Request is transmitted.

  The identification information registration unit 106 is a part that stores identification information and non-contact information according to the connection result of the wireless LAN base units 201 to 20n. When the connection result information output by the response signal receiving unit 105 is “OK”, the identification information registration unit 106 uses the SSID output by the response signal receiving unit 105 as the BSSID output by the response signal receiving unit 105. And stored in the identification information storage unit 107 as identification information. On the other hand, when the connection result information output by the response signal receiving unit 105 is “NG”, the identification information registration unit 106 stores only the BSSID output by the response signal receiving unit 105 as non-contact information. Stored in the unit 109. The identification information stored in the identification information storage unit 107 and the non-contact information stored in the non-contact information storage unit 109 are used later when reconnecting to the wireless LAN base units 201 to 20n. Become.

  Subsequently, an operation of the wireless LAN terminal 10 according to the present embodiment will be described, and a connection establishment method according to the embodiment of the present invention will be described. FIG. 5 is an operation transition diagram showing the operation of the wireless LAN terminal 10 according to the present embodiment.

  Hereinafter, an operation when the wireless LAN terminal 10 is connected to the wireless LAN master 201 will be described with reference to FIG.

  First, a search for a beacon signal periodically transmitted from the wireless LAN base unit 201 is started by automatically changing the radio channel of the radio wave received by the notification signal receiving unit 101 (step S01). More specifically, ‘CH 1’, ‘CH 6’, ‘CH 11’, and ‘CH 14’, which are wireless channels used in the wireless LAN system 1, are sequentially used to search for a beacon signal.

  While the notification signal receiving unit 101 is searching for the beacon signal, the wireless LAN master device 201 transmits the beacon signal using the wireless channel “CH1” (step S02). If the beacon signal is not searched by the notification signal receiving unit 101 using the wireless channel “CH1” when the beacon signal is transmitted, the wireless LAN terminal 10 does not receive the beacon signal. Thereafter, the transmission of the beacon signal by the wireless LAN base device 201 is repeatedly performed at a constant cycle.

  While the beacon signal search is performed using the wireless channel 'CH1' by the notification signal receiving unit 101 (step S03), the notification is performed when the beacon signal is transmitted again from the wireless LAN base unit 201 (step S04). The beacon signal is received by the signal receiving unit 101 (step S05).

  The identification information search unit 102 determines whether or not the received beacon signal includes an SSID (step S06). If the SSID is not included (step S06: NO), the process proceeds to step S07. To do. If the SSID is included (step S06: YES), the process proceeds to step S11, and the request signal transmission unit 104 identifies the BSSID and the network 301 that identify the wireless LAN base unit 201 included in the beacon signal. Probe Request including the SSID to be transmitted is transmitted to the wireless LAN base unit 201 using the wireless channel 'CH1'.

  On the other hand, when the SSID is not included in the beacon signal (step S06: NO), it is stored in the identification information storage unit 107 by the identification information search unit 102 based on the BSSID of the wireless LAN base unit 201 included in the beacon signal. The identified information is searched (step S07). When the identification information including the BSSID exists (step S08: YES), the identification information is output to the identification information specifying unit 103, and the SSID included in the identification information is specified by the identification information specifying unit 103, and the processing is performed. To step S10.

  When there is no identification information including the BSSID of the wireless LAN base device 201 (step S08: NO), the identification information specifying unit 103 has the highest priority among the priority SSID lists stored in the priority identification information storage unit 108. A high SSID is selected (step S09), and the process proceeds to step S10. Next, the request signal transmission unit 104 determines whether or not the non-contact information including the BSSID of the wireless LAN base device 201 exists in the non-contact information storage unit 109 (step S10). (Step S10: NO), the process proceeds to Step S11. If there is non-contact information (step S10: YES), this means that the connection between the wireless LAN terminal 10 and the wireless LAN base unit 201 has not been established in the past, and thus the process is terminated. If the contactless information does not exist (step S10: NO), a probe request including the BSSID of the wireless LAN base device 201 and the selected SSID is transmitted (S11). On the other hand, if the selected SSID matches the SSID of the wireless LAN network 301, the probe response transmitted from the wireless LAN base device 201 is received by the response signal receiving unit 105 (step S12). The processes in steps S09 to S11 are performed until all probe SSIDs stored in the priority identification information storage unit 108 receive a probe response from the wireless LAN base unit 20 at a predetermined time after the probe request is transmitted. Is repeatedly performed according to the priority information.

  On the other hand, when the identification information including the BSSID of the wireless LAN base device 201 exists (step S08: YES), the above-described processing of S10 to S12 is performed using the SSID included in the identification information.

  Next, when a Probe Response is received from the wireless LAN base unit 201 at a certain time after the probe request is transmitted (step S12), the identification information registration unit 106 identifies the used SSID as identification information in association with the BSSID. It is stored in the information storage unit 107. On the other hand, when no probe response is received from the wireless LAN base unit 201 within a certain time after the probe request is transmitted, the contact information including the BSSID is stored in the contact information storage unit 109 by the identification information registration unit 106. (Step S13).

  In the present embodiment, since the notification signal receiving unit 101 receives a beacon signal including a BSSID from the wireless LAN master devices 201 to 20n, the wireless LAN master device that transmits the beacon signal can be specified. The identification information search unit 102 searches for identification information related to the wireless LAN base units 201 to 20n that transmitted the beacon signal, and the identification information specifying unit 103 identifies the wireless LAN networks 301 to 30n to which the wireless LAN base units 201 to 20n belong. The request signal transmission unit 104 transmits a probe request to the wireless LAN base units 201 to 20n based on the SSID, and the response signal reception unit 105 receives a probe response from the wireless LAN base units 201 to 20n. Since the identification information registration unit 106 stores the identification information based on the responses from the wireless LAN base units 201 to 20n, it can be easily reconnected to the wireless LAN base unit that has been successfully connected in the past. Transmission of a request signal can be prevented.

  In the wireless LAN terminal 10 of this embodiment, the notification signal receiving unit 101 specifies a BSSID for identifying the wireless LAN master devices 201 to 20n by receiving beacon signals from the wireless LAN master devices 201 to 20n. However, this may be specified by receiving a Probe Response including the BSSID from the wireless LAN base units 201 to 20n by the wireless LAN terminal 10 transmitting a Probe Request that does not include the SSID by broadcast.

  FIG. 5 is an operation transition diagram showing the operation of the wireless LAN terminal 10 in the above case. According to FIG. 5, first, the request signal transmission unit 104 transmits a probe request not including an SSID by broadcast (broadcast) (step S21). Broadcast transmission is performed by setting the BSSID included in the probe request to a specific symbol (for example, all bits set to ‘1’). In response to this, the wireless LAN base device 201 transmits a probe response including a BSSID for identifying the wireless LAN base device 201, and is received by the notification signal receiving unit 101 (step S22). Subsequent basic operations in Step S23 to Step S30 are the same as Steps S06 to Step 13 in the operation of the wireless LAN terminal 10 when receiving the beacon signal in FIG. With this operation, even when connecting to a wireless LAN base unit that does not transmit a beacon signal, the first identification symbol for identifying the wireless LAN base unit can be easily specified.

It is a block diagram of the wireless LAN system which is embodiment of this invention. It is a block diagram of the data stored in the identification information storage part of FIG. It is a block diagram of the data stored in the priority identification information storage part of FIG. It is a block diagram of the data stored in the non-contact information storage part of FIG. FIG. 6 is an operation transition diagram showing a series of operations when a wireless LAN terminal receives a beacon signal. It is an operation | movement transition diagram which shows a series of operation | movement when a wireless LAN terminal does not receive a beacon signal.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1-n ... Wireless LAN system, 10 ... Wireless LAN terminal, 101 ... Notification signal receiving part, 102 ... Identification information search part, 103 ... Identification information specific | specification part, 104 ... Request signal transmission part, 105 ... Response signal receiving part, 106: Identification information registration unit, 107: Identification information storage unit, 109: Non-contact information storage unit, 201-20n: Wireless LAN base unit, 301-30n: Wireless LAN network.

Claims (3)

In a wireless LAN terminal that transmits / receives information to / from a wireless LAN master using a wireless signal in a wireless LAN system,
Identification information storage means for storing a second identification symbol for identifying a wireless LAN network to which the wireless LAN base unit belongs, identifying information associated with the first identification symbol for identifying the wireless LAN base unit;
Notification signal receiving means for receiving a notification signal including the first identification symbol transmitted from the wireless LAN base unit;
Identification information search means for searching the identification information stored in the identification information storage means based on a first identification symbol included in the notification signal, and identifying identification information including the first identification symbol;
When the identification information including the first identification symbol included in the notification signal does not exist in the identification information storage means, the priority second identification including the second identification symbol for identifying the wireless LAN network to be preferentially connected. When a specific second identification symbol is selected from the group and the identification information including the first identification symbol included in the notification signal exists in the identification information storage unit, the second information included in the identification information Identification information specifying means for specifying an identification symbol;
A request signal for transmitting a request signal for requesting connection to the wireless LAN base unit using the first identification symbol included in the notification signal and the second identification symbol selected or specified by the identification information specifying means A transmission means;
Response signal receiving means for receiving a response signal for indicating that connection is permitted from the wireless LAN base unit to the request signal transmitted by the request signal transmitting means;
When the response signal is received by the response signal receiving unit, the second identification symbol selected or specified by the identification information specifying unit is associated with the first identification symbol included in the notification signal as the identification information. A wireless LAN terminal comprising: identification information registration means for storing in the identification information storage means. Further comprising non-contact information storage means for storing non-contact information including a first identification symbol for identifying the wireless LAN base unit in which connection has not been established,
The request signal transmission means does not transmit the request signal to the wireless LAN base unit when the non-contact information including the first identification symbol included in the notification signal exists in the non-contact information storage means. Finish the process
The identification information registration unit stores non-contact information including a first identification symbol included in the notification signal in the non-contact information storage unit when the response signal is not received by the response signal reception unit. The wireless LAN terminal according to claim 1. The priority second identification group includes a plurality of prioritized second identification symbols, and the identification information specifying means sequentially selects the second identification symbols having higher priorities, and the response signal receiving means 3. The wireless LAN terminal according to claim 1, wherein when the response signal is not received within a predetermined time from when the request signal is transmitted, the second identification symbol having the next highest priority is selected.

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