JP5608913B2 - Wireless terminal having automatic ID update function - Google Patents

Description

  The present invention relates to a wireless terminal conforming to IEEE 802.11, and more particularly to a wireless connection technique using ESSID.

  In a wireless LAN system compliant with IEEE802.11, ESSID (Extended Service Set Identifier) is used as a setting necessary for wireless communication between wireless devices such as a wireless LAN terminal and a wireless access point (hereinafter referred to as wireless AP). ) Note that the name of the ESSID described in this embodiment may be abbreviated as SSID.

  The ESSID is an identifier indicating a group to communicate with, and wireless devices that want to communicate in the same group need to set the same ESSID. For example, when the wireless LAN system tries to communicate as the same group in the infrastructure mode, the wireless AP and the wireless LAN terminal all communicate by setting the same ESSID.

  Here, when the ESSID of the wireless AP is changed, all wireless LAN terminals communicating in the same group must be changed to the same ESSID.

  As a method for the wireless LAN terminal to easily acquire the ESSID set in the wireless AP, there is a method of reading out the ESSID information when the beacon periodically broadcast by the wireless AP includes the ESSID information. is there.

  However, in a wireless AP communication method, a method that does not include ESSID information in a beacon called a stealth function is common, and when a wireless AP is operating with a stealth function, the wireless LAN terminal can easily be connected to the wireless AP I can not get any information.

  Also, when installing a large number of wireless terminals, the setting of the ESSID of each wireless terminal must be changed, and the effort for changing the setting increases according to the number of wireless terminals to be installed.

  Patent Document 1 discloses a technique for reducing the trouble of changing the setting of a wireless terminal when the setting of the wireless AP is changed. In Patent Document 1, information related to the wireless AP setting change is stored in a storage medium, and when the wireless terminal device cannot be connected, the stored wireless AP information is acquired and used. By establishing wireless communication, the user can automatically establish a connection with the latest network settings without being aware of the network connection.

JP 2008-78957 A

  However, the technique of Patent Document 1 requires a special wireless AP that can save information related to the setting change of the wireless AP in a storage medium. When applied to a wireless LAN system that is already in operation, Some measures such as exchanging the wireless AP with this special wireless AP are required.

  The present invention is a wireless LAN system that uses a general-purpose wireless AP that does not have a special function, and when a wireless AP ESSID is changed, a wireless terminal that automatically establishes a wireless connection using the changed ESSID The purpose is to provide.

A wireless terminal having an automatic ID update function according to the present invention is a wireless LAN system including a wireless device, a wireless terminal, and another wireless terminal. and a said wireless terminal to establish a wireless connection, when the other wireless terminal to establish said wireless device and wirelessly connected, is communicated with the other wireless terminal and the wireless device, the source address and destination an ID acquisition means for acquiring the predetermined ID from control frame ID of the wireless device to the wireless terminal to the address has established a wireless connection is used, the predetermined ID acquired by the ID acquisition means an ID storage means for storing a predetermined ID to be used in establishing the non-linear connection in a predetermined manner from the predetermined ID stored in the ID storage unit When the wireless connection between the reconnection ID determination means to be determined and the wireless device that has been connected is disconnected due to a change in a predetermined ID that is an identifier indicating the group to communicate with , the reconnection ID determination Wireless connection re-establishing means for establishing a wireless connection using the predetermined ID determined by the means.

Group Further, a wireless terminal having an ID automatic update feature of the present invention, further, before Symbol ID acquisition means, to the other radio terminal the communication from the control frame for wireless connection establishment request transmitted to the wireless device acquires predetermined ID is an identifier indicating, said ID storage means, check the response information indicative of establishing those wireless devices in response of radio connection to be transmitted to the other wireless terminal to the wireless connection establishment request then, characterized in that it memorize the predetermined ID of the ID acquisition means has acquired.

Further, a wireless terminal having an ID automatic update feature of the present invention, further, a predetermined manner of the re-connection ID determining means, acquired by the I D acquisition means, stored in said ID storing means Among the predetermined IDs , the other wireless terminal has the highest use frequency .

Further, a wireless terminal having an ID automatic update feature of the present invention, further, the I D control frame which is transmitted and received with the other wireless terminal and the wireless device is in the acquisition means, Association frames, Reassociation frame or Probe frame It is characterized by being.

  According to the present invention, when the ESSID of a wireless AP is changed in a wireless LAN system using a general-purpose wireless AP having no special function, the wireless connection is automatically established using the changed ESSID. A wireless terminal can be provided, and the burden on the user when changing the ESSID is reduced.

  Further, when a large number of wireless terminals are installed, the use of the wireless terminal according to the present invention eliminates the need for changing the ESSID setting according to the number of wireless terminals to be installed. The burden of is reduced.

FIG. 1 is an overall configuration diagram of the present invention. FIG. 2 is a block diagram of the radio terminal of the present invention. FIG. 3 is an ESSID table of the present invention. FIG. 4 is a flowchart of the present invention. FIG. 5 is a sequence diagram of the present invention. FIG. 6 is a diagram showing a format of control information according to the present invention.

  FIG. 1 shows an overall configuration diagram. The wireless LAN system in FIG. 1 includes a wireless AP 10, a wireless terminal 20, and another terminal 30. Note that the wireless AP 10 may be connected to the network 40.

The wireless terminal 20 is a wireless terminal according to the present invention, and the other terminal 30 is a wireless terminal in a state where it can establish wireless connection with the wireless AP 10 and perform wireless communication.
The other terminal 30 may be a wireless terminal according to the present invention or a general-purpose wireless terminal having no special function.

  The wireless AP 10 is a general-purpose wireless access point. The wireless AP 10, the wireless terminal 20, and the other terminal 30 establish a wireless connection and transmit / receive wireless data in accordance with IEEE 802.11 wireless LAN regulations.

  FIG. 2 shows a block diagram of the radio terminal 20 according to the present invention. The wireless communication unit 201 performs transmission / reception of a control frame (association frame or association frame) related to establishment of a wireless connection and transmission / reception of wireless data with another wireless device such as the wireless AP 10 or the other terminal 30.

  The disconnection detection unit 202 checks the state of establishment of the wireless connection of the terminal itself, and when detecting the disconnection state, starts the operation of the reconnection ESSID determination unit 205. Whether or not the wireless connection of the terminal itself is in a disconnected state is determined by a method of determining from information on a sequence number when a Beacon of the wireless AP is received or a method of determining whether a Deauthentication frame is received from the wireless AP.

  The wireless connection establishment request monitoring unit 203 observes a control frame (association frame or association frame) transmitted and received wirelessly when the other terminal 30 establishes a wireless connection with the wireless AP 10.

  The determination of the control frame to be observed is made on the condition that the ID (BSSID) of the wireless AP 20 with which the terminal establishes wireless connection is used for the transmission source address and the destination address of the control frame. .

  When the ESSID information is included in the observed control frame, the wireless connection establishment request monitoring unit 203 determines the ID of the wireless terminal that is transmitting / receiving the control frame and the ESSID included in the control frame. The grouped information is passed to the ESSID storage unit 204 to update the ESSID table in the ESSID storage unit 204.

  As a control frame including ESSID information, there is an association frame, a reassociation frame, or a probe frame.

  When the ESSID table of the ESSID storage unit 204 is updated from the association frame or the reassociation frame, it is updated when the status of the control frame returned as a response to the frame is a code indicating success success.

  When the ESSID table of the ESSID storage unit 204 is updated from the Probe frame, the update is performed when a control frame returned as a response to the Probe frame is observed.

  The ESSID storage unit 204 stores the ESSID table shown in FIG. The ESSID table includes a field wireless terminal ID 2041 for storing the terminal ID of the wireless terminal and a field ESSID 2042 for storing the ESSID, and stores a record 2044 for each wireless terminal. Information on the wireless terminal ID 2041 and the ESSID 2042 is acquired from the wireless connection establishment request monitoring unit 203.

  This is added when the wireless terminal ID and ESSID acquired from the wireless connection establishment request monitoring unit 203 are not stored in the ESSID table.

  The wireless terminal ID 2041 is an ID (MAC address or IP address) of a terminal that has established a wireless connection with the same wireless AP 20 as the wireless AP 20 with which the terminal itself has established a wireless connection. The ESSID 2042 is an ESSID used in a control frame transmitted and received by the wireless terminal indicated by the wireless terminal ID 2041.

  Note that the update time field may be recorded as an element of the ESSID table of FIG. When there is an update time field in the ESSID table of FIG. 3, when the wireless terminal ID and ESSID acquired from the wireless connection establishment request monitoring unit 203 are newly added or detected again, the update time field Record the current time.

  3 may be deleted after a predetermined time (5 minutes in this embodiment) has elapsed.

  The reconnection ESSID determination unit 205 reads the information in the ESSID storage unit 204, determines an ESSID for reestablishing the wireless connection, and executes reconnection in order to reestablish the wireless connection using the ESSID. The operation of the unit 206 is started.

  The ESSID determination method for re-establishing the wireless connection is used by many wireless terminals among the plurality of ESSID types when there are a plurality of ESSID types recorded in the ESSID 2042 as shown in FIG. Select ESSID.

  In the case of FIG. 3, there are two types of ESSIDs recorded in ESSID 2042: ESSID-A and ESSID-B, three wireless terminals using ESSID-A, and wireless using ESSID-B Since there is one terminal, ESSID-A is selected.

  As another method of determining the ESSID for re-establishing the wireless connection, when the update time is further recorded as an element of the set 2044 of the ESSID table in FIG. 3, the recorded update time is recorded. May select an ESSID close to the current time.

  The reconnection ESSID determination unit 205 notifies the reconnection execution unit 206 of the ESSID for reestablishing the wireless connection determined as described above.

  The reconnection execution unit 206 uses the ESSID notified from the reconnection ESSID determination unit 205 to establish a wireless connection. Establishment of a wireless connection uses an Association control frame.

  FIG. 4 shows a flowchart. This flowchart starts when the power of the wireless terminal 20 is turned on.

  After the power is turned on, the wireless terminal 20 establishes a wireless connection with the wireless AP 10 using an ESSID set in advance using an operation input unit (not shown) (S401).

  In addition, the wireless connection establishment request monitoring unit 203 observes a control frame in which the other terminal 30 attempts to establish or establish a wireless connection with the wireless AP 20 (S402).

  When the wireless connection establishment request monitoring unit 203 observes the association frame or the association frame (S403: YES), the wireless connection establishment request monitoring unit 203 extracts the ESSID information of the association frame (S405).

  The ESSID table of the ESSID storage unit 204 is updated with the MAC address of the other terminal 30 that is transmitting / receiving the association frame or the association frame and the extracted ESSID information (S406), and the process returns to S403.

  When the wireless connection establishment request monitoring unit 203 does not observe the association frame or the reassociation frame (S403: NO), the connection disconnection detection unit 202 checks whether or not the wireless connection of the terminal itself is disconnected, and determines that it is disconnected. In the case (S404: YES), the process proceeds to S407.

  When the connection disconnection detection unit 202 does not determine that the wireless connection is disconnected (S404: NO), the process returns to S403.

  The reconnection ESSID determination unit 205 checks whether there is a record in the ESSID table of the ESSID storage unit 204 (S407).

  If there is no record in the ESSID table of the ESSID storage unit 204 (S407: NO), the reconnection ESSID determination unit 205 returns to S403.

  If there is no record in the ESSID table of the ESSID storage unit 204 (S407: NO), the previous wireless connection is established so that the wireless connection of the terminal does not remain disconnected before returning to S403. The wireless connection may be established using the ESSID used at the time.

  When there is a record in the ESSID table of the ESSID storage unit 204 (S407: YES), the reconnection ESSID determination unit 205 selects the ESSID used by the most wireless terminals (S408).

  The reconnection execution unit 206 establishes a wireless connection using the ESSID selected in S408 (S409). The reconnection execution unit 206 checks whether or not a wireless connection has been established (S410), and if established, returns to S403 (S410: YES).

  When the wireless connection is not established (S410: NO), the reconnection execution unit 206 deletes the record of the ESSID (S411) and returns to S407.

  FIG. 5 shows a sequence. The system of this sequence is a wireless LAN system including the wireless AP 10, the wireless terminal 20, the other terminal 30-1, and the other terminal 30-2. The wireless AP 10, the other terminal 30-1, and the other terminal 30-2 The wireless terminal 20 is a wireless terminal according to the present invention.

  In this sequence, after all SSID-A is set as the ESSID of the wireless AP 10 and all wireless devices of this wireless LAN system are in a wireless connection established state, the ESSID of the wireless AP 10 is changed to SSID-B. change.

  It is assumed that the wireless terminal 20 and the other terminal 30-1 each establish a wireless connection with the wireless AP 10 and are in communication (S501), and that the other terminal 30-2 is not established.

  The other terminal 30-2 is set with SSID-A as the ESSID by the user (S502).

  In order to establish a wireless connection with the wireless AP 10, the other terminal 30-2 transmits a wireless connection establishment request using an association frame or an association frame including an ESSID using SSID-A (S503).

  The wireless terminal 20 observes the procedure of S503, extracts the ESSID used by the other terminal 30-2, and stores it in the ESSID storage unit 204 (S504).

  The other terminal 30-2 establishes a wireless connection with the wireless AP 10 and enters a communication state (S505).

  Here, it is assumed that the wireless AP 10 has changed the ESSID to SSID-B by the administrator of the wireless system (S506).

  Since the ESSID of the wireless AP 10 has been changed, it does not match the ESSID used by the wireless terminal 20, the other terminal 30-1, and the other terminal 30-2, and all wireless devices in the wireless LAN system are in a disconnected state. (S507).

  Here, it is assumed that the other terminal 30-1 changes the ESSID of the other terminal 30-1 to SSID-B by the user (S508).

  In order to establish a wireless connection with the wireless AP 10, the other terminal 30-1 transmits a wireless connection establishment request by using an Association frame or an Association frame using SSID-B as the ESSID (S509).

  The wireless terminal 20 observes the procedure of S509, extracts the ESSID used by the other terminal 30-1, and stores it in the ESSID storage unit 204 (S510).

  The other terminal 30-1 establishes a wireless connection with the wireless AP 10 and enters a communication state (S511). Here, it is assumed that the other terminal 30-2 changes the ESSID of the other terminal 30-2 to SSID-B by the user (S512).

  In order to establish a wireless connection with the wireless AP 10, the other terminal 30-2 transmits a wireless connection establishment request using an association frame or an association frame using SSID-B as the ESSID (S513).

  The wireless terminal 20 observes the procedure of S513, extracts the ESSID used by the other terminal 30-2, and stores it in the ESSID storage unit 204 (S514).

  The other terminal 30-2 establishes a wireless connection with the wireless AP 10 and enters a communication state (S515).

  The connection disconnection detection unit 202 detects that the wireless connection is disconnected (S516). The reconnection ESSID determination unit 205 refers to the ESSID table of the ESSID storage unit 204 and selects SSID-B as the reconnection ESSID (S517).

  The reconnection execution unit 206 transmits a wireless connection establishment request using an association frame or an association frame using the SSID-B of the ESSID selected by the reconnection ESSID determination unit 205 in order to establish a wireless connection with the wireless AP 10. (S518). The wireless terminal 20 establishes a wireless connection with the wireless AP 10 and enters a communication state (S519).

  FIG. 6 shows the format of the control information. The format of the control information in FIG. 6 is the standard “IEEE Standard for Information technology-Telecommunications and information exchange between systems-Local and metropolitan area networks-Specific requirements-Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer. Management Frame Format based on (PHY) Specifications document.

  In FIG. 6, reference numeral 601 denotes an association request frame, reference numeral 602 denotes an association response frame, reference numeral 603 denotes a association request frame, and reference numeral 604 denotes a association response frame.

  The Association Request frame 601 is used in an association request from the wireless terminal to the AP, and the response is an Association Response frame 602.

  It is determined that the information to be updated in the ESSID table of the ESSID storage unit 204 is when the status code in the Association Response frame 602 is a code indicating success.

  The revocation request frame 603 is used in a request for reassociation from the wireless terminal to the AP, and the response is a revocation response frame 604.

  The ESSID table of the ESSID storage unit 204 is determined to be information to be updated when the status code of the Resociation Response frame 604 is a code indicating success.

  In FIG. 6, reference numeral 605 denotes a probe request frame, and reference numeral 606 denotes a probe response frame.

  The Probe Request frame 605 is used in a Probe request from the wireless terminal to the AP, and the response is a Probe Response frame 606. It is determined that the probe response frame 606 is observed as a response to the probe request frame to determine that the ESSID table in the ESSID storage unit 204 should be updated.

  As described above, the wireless terminal 20 of the present invention detects the ESSID in the control frame transmitted by the other terminal 30-2 for the request for establishing the wireless connection with the wireless AP 10, and transmits the ESSID from the wireless AP 10 to the other terminal 30-2. The ESSID can be reliably detected by updating and storing the ESSID table of the ESSID storage unit 204 with the detected ESSID.

10 Wireless AP
20 wireless terminal 30 other terminal 40 network 201 wireless communication unit 202 connection disconnection detection unit 203 wireless connection establishment request monitoring unit 204 ESSID storage unit 205 reconnection ESSID determination unit 206 reconnection execution unit 601 association request frame 602 association response frame 603 reassociation Request frame 604 Revocation Response frame 605 Probe Request frame 606 Probe Response frame

Claims (4)

In the wireless LAN system composed of a wireless device and a wireless terminal and another wireless terminal, using a predetermined ID is an identifier indicating a group to communicate a said wireless terminal to establish the wireless device and a wireless connection,
When the other wireless terminal establishes a wireless connection with the wireless device, transmission / reception is performed between the other wireless terminal and the wireless device, and the wireless terminal establishes a wireless connection at a transmission source address or a destination address. ID acquisition means for acquiring the predetermined ID from a control frame in which the ID of the wireless device is used ;
ID storage means for storing the predetermined ID acquired by the ID acquisition means;
Reconnection ID determining means for determining the predetermined ID used when establishing a wireless connection by a predetermined method from the predetermined ID stored in the ID storage means;
If the wireless connection with the wireless device that was connected becomes disconnected by changing the predetermined ID is an identifier indicating the group to the communication, using the predetermined ID determined in the re-connection ID determining means Wireless connection re-establishing means for establishing a wireless connection,
A wireless terminal having an automatic ID update function. The wireless terminal according to claim 1,
The ID acquisition means acquires a predetermined ID that is an identifier indicating the group to communicate from a control frame for a wireless connection establishment request transmitted from the other wireless terminal to the wireless device;
The ID storage unit, when the wireless device in response to the radio connection establishment request to check the response information indicative of the establishment of the wireless connection to be transmitted to the other wireless terminals, the predetermined ID of the ID acquisition means acquires A wireless terminal having an automatic ID update function. The wireless terminal according to claim 1 or 2, wherein
Predetermined method of the re-connection ID determining means, acquired by the I D acquisition unit, of the ID storage means stored the predetermined ID, the other radio terminals is most frequently used A wireless terminal having an automatic ID update function characterized by a high ID. A wireless terminal according to any one of claims 1 to 3,
The I D control frame which is transmitted and received with the other wireless terminal and the wireless device is in the acquisition means, a wireless terminal having an ID automatic update function, wherein the Association frame, a Reassociation frame or Probe frame.

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