JP5397090B2 - Portable terminal device and wireless LAN connection method - Google Patents

Description

  The present invention relates to a portable terminal device capable of wireless LAN connection and a wireless LAN connection method of this device.

  Some portable terminal devices such as cellular phones and notebook personal computers can use a wireless local area network (hereinafter referred to as WLAN) (see, for example, Patent Document 1). This type of mobile terminal device can construct a WLAN with a parent device such as an access point (in infrastructure mode) or another mobile terminal device capable of WLAN connection (in ad hoc mode). For this reason, this type of portable terminal device can be connected to the parent device (hereinafter referred to as WLAN connection) so that various data such as files can be transmitted and received by wireless communication.

  When establishing a WLAN connection, the mobile terminal device and the parent device may perform authentication processing using an authentication program in cooperation with each other in order to increase the security of the WLAN constructed by the mobile terminal device and the parent device. Many. Particularly recently, WiFi Protected Access (WPA, WPA2), which has higher security strength than conventional WEP (Wired Equivalent Privacy), is increasingly used as an authentication program.

  When WPA or WPA2 (hereinafter collectively referred to as WPA) is used as the authentication program, the WLAN connection between the mobile terminal device and the parent device is established by the following procedure. First, the mobile terminal device scans a frequency band that can be used as a WLAN in order to detect a parent device existing in the vicinity of the mobile device. Next, the mobile terminal device and the detected base unit perform association processing using a service set identifier (hereinafter referred to as SSID (Service Set Identifier)). Next, the master unit receives an authentication key from the portable terminal device, and performs an authentication process by, for example, 4-way handshake using the authentication key. Then, the base unit performs an IP address assignment process for the mobile terminal device. As a result, the mobile terminal device can establish a WLAN connection with the parent device. The service set identifier (SSID) includes ESSID (Extended SSID).

JP 2006-238272 A

  However, the conventional technology cannot sufficiently cope with a case where there are a plurality of parent devices having the same SSID. Hereinafter, a case where there are a first parent device (desired parent device) and a second parent device (unnecessary parent device) will be described as an example when there are a plurality of parent devices having the same SSID. . It is assumed that the mobile terminal device stores a valid authentication key for the first base unit, but does not store a valid authentication key for the second base unit.

  For example, by scanning a frequency band that can be used by the mobile terminal device, a first base device and a second base device having the same SSID as the SSID stored in the mobile device are detected, and the mobile terminal device Let us consider a case where the RSSI of the second base unit is higher than the signal strength of the first base unit (hereinafter referred to as RSSI (Received Signal Strength Indication)). In this case, first, association processing using the SSID is attempted between the second parent device having a high RSSI and the mobile terminal device. This association process succeeds because the SSID matches and does not require an authentication key. On the other hand, the authentication key held by the mobile terminal device is not a valid authentication key for the second parent device. For this reason, the authentication process between the mobile terminal device and the second master unit fails.

  However, if the mobile terminal device using the conventional technology has succeeded in the association process with the second master unit, even if the subsequent authentication process fails, Return to the procedure to scan the available frequency band again without trying the association process. For this reason, when the RSSI of the second parent device is higher than the RSSI (desired parent device) of the first parent device, the conventional technology connects the mobile terminal device and the first parent device via WLAN. I can't.

  The present invention has been made in consideration of the above-described circumstances. A portable terminal device capable of reliably establishing a WLAN connection with a desired parent device even when there are a plurality of parent devices having the same SSID, and the device An object of the present invention is to provide a wireless LAN connection method.

  In order to solve the above-described problem, the mobile terminal device according to the present invention includes a connection setting storage unit that stores information on an authentication key of a desired parent device, and an exclusion list storage that stores information on a predetermined basic service set identifier. Received from each of the one or more master units, the scan control unit that attempts to wirelessly receive a signal including service set identifier information and basic service set identifier information from each of the one or more master units Stored in the received signal strength measuring unit for measuring the received strength of the signal, an identifier acquiring unit for acquiring the information on the service set identifier and the information on the basic service set identifier from the signal, and the exclusion list storage unit The one or other units other than the parent device that has given the signal including information of the same basic service set identifier as the predetermined basic service set identifier The basic service set identifier included in the signal given from the base unit that is the target of the connection trial, in order from the base unit that gave the signal having a high reception strength for the plurality of base units in order An association processing unit that performs an association process in cooperation with the connection trial target base unit using the information of the connection trial, and if the association process is successful, stores in the connection setting storage unit in cooperation with the connection trial target base unit An authentication processing unit that performs an authentication process using the authentication key that has been obtained, and the basic service set identifier that is acquired by the identifier acquisition unit from the signal that is given from the base unit that is the connection trial target if the authentication process fails Is stored as one of the predetermined basic service set identifiers in the exclusion list storage unit and the scan control unit stores the A connection establishment unit that determines that the connection-target parent device is the desired parent device and establishes a wireless LAN connection with the parent device when the authentication process is successful. It is characterized by comprising.

  In addition, in order to solve the above-described problem, the mobile terminal device according to the present invention includes a connection setting storage unit that stores information on a service set identifier of a desired parent device and information on an authentication key in association with each other, and a predetermined basic An exclusion list storage unit that stores information on service set identifiers, a scan control unit that attempts to wirelessly receive a signal including service set identifier information and basic service set identifier information from each of one or a plurality of master units, and A received signal strength measuring unit for measuring the received strength of the signal received from each of one or a plurality of base units; and an identifier acquiring unit for acquiring the service set identifier information and the basic service set identifier information from the signal And a service set identifier identical to the service set identifier of the desired master unit stored in the connection setting storage unit One or more of the parent devices that have given the signal include the parent device that has given the signal that includes the same basic service set identifier information as the predetermined basic service set identifier stored in the exclusion list storage unit Of the basic service set identifier included in the signal given from the base unit that is the target of the connection trial. An association processing unit for performing an association process in cooperation with the base unit to be connected using information, and the service included in the signal given from the base unit for the connection attempt when the association process is successful Search the connection setting storage unit using a set identifier to extract the authentication key associated with the service set identifier, An authentication processing unit that performs authentication processing in cooperation with the connection attempt target parent device using the extracted authentication key, and if the authentication processing fails, from the signal given from the connection attempt target parent device The basic service set identifier acquired by the identifier acquisition unit is stored in the exclusion list storage unit as one of the predetermined basic service set identifiers, and the scan control unit is controlled to retry the radio reception of the signal. On the other hand, when the authentication process is successful, a connection establishment unit that determines the parent device to be connected as the desired parent device and establishes a wireless LAN connection with the parent device is provided. It is.

  On the other hand, a wireless LAN connection method according to the present invention is a wireless LAN connection method for a portable terminal device that performs wireless LAN connection with a desired parent device in order to solve the above-described problems, and authentication of the desired parent device A step of storing key information in the connection setting storage unit; a step of storing information of a predetermined basic service set identifier in the exclusion list storage unit; and service set identifier information and basic information from each of one or a plurality of master units Attempting to wirelessly receive a signal including service set identifier information; measuring a reception strength of the signal received from each of the one or more master units; and information on the service set identifier from the signal; Obtaining basic service set identifier information; and the predetermined basic service stored in the exclusion list storage unit Wireless LAN connection in order from the parent device that gave the signal having the higher reception strength for the one or more parent devices except the parent device that gave the signal that includes the same basic service set identifier information as the network identifier. An association processing unit for performing an association process in cooperation with the connection attempt target base unit using information on the basic service set identifier included in the signal given from the connection target target base unit; When the association process is successful, the authentication process is performed using the authentication key stored in the connection setting storage unit in cooperation with the connection target parent unit and the authentication process. If the processing fails, the basic service set identifier acquired from the signal given from the base unit to be connected is set as the predetermined service. When the authentication process is successful in the step of returning to the step of trying to wirelessly receive the signal and storing the signal in the exclusion list storage unit as one of the basic service set identifiers and the step of performing the authentication process, Determining a machine as the desired parent machine and establishing a wireless LAN connection with the parent machine.

  In addition, a wireless LAN connection method according to the present invention is a wireless LAN connection method for a mobile terminal device that performs wireless LAN connection with a desired parent device in order to solve the above-described problem, and the service of the desired parent device Storing the set identifier information and the authentication key information in the connection setting storage unit, storing the predetermined basic service set identifier information in the exclusion list storage unit, and each of the one or a plurality of parent devices And trying to wirelessly receive a signal including service set identifier information and basic service set identifier information, measuring the reception strength of the signal received from each of the one or more master units, and the signal Obtaining the service set identifier information and the basic service set identifier information from, and the exclusion list For the one or a plurality of parent devices excluding the parent device to which the signal including the information of the same basic service set identifier as the predetermined basic service set identifier stored in the storage unit is given, the signal having the high reception strength is transmitted. A wireless LAN connection is a trial target in order from the given master unit, and the basic service set identifier information included in the signal given from the master unit that is the connection trial target is used to cooperate with the connection trial target master unit And performing the association process, and when the association process is successful, the connection setting storage unit is searched by using the service set identifier included in the signal given from the connection target parent device. The authentication key associated with the service set identifier is extracted, and the extracted authentication key is used to cooperate with the parent device to be connected. If the authentication processing fails in the authentication processing step and the authentication processing step, the basic service set identifier obtained from the signal given from the connection target parent device is set to the predetermined basic When the authentication processing is successful in the step of returning to the step of attempting to wirelessly receive the signal and storing the signal in the exclusion list storage unit as one of the service set identifiers and the step of performing the authentication processing, And determining the desired master unit and establishing a wireless LAN connection with the master unit.

  According to the portable terminal device and the wireless LAN connection method of the device according to the present invention, the portable terminal device can reliably establish a WLAN connection with a desired parent device even when there are a plurality of parent devices having the same SSID. it can.

1 is a schematic overall configuration diagram showing an embodiment of a mobile terminal device according to the present invention. The block diagram which shows roughly the internal structural example of a mobile telephone and 1st AP. The schematic block diagram which shows the structural example of the function implementation part by CPU of a main control part. Explanatory drawing shown about an example of the conditions by which the data memorize | stored in the exclusion list memory | storage part by the list deletion part are deleted. The flowchart which shows the procedure of the WLAN connection trial when the some main | base station which has the same SSID in the prior art exists. 6 is a flowchart illustrating an example of a procedure for reliably establishing a WLAN connection with a desired parent device even when there are a plurality of parent devices having the same SSID in the mobile phone according to the present embodiment. 9 is a flowchart showing another example of a procedure for reliably establishing a WLAN connection with a desired parent device even when there are a plurality of parent devices having the same SSID in the mobile phone according to the present embodiment. The flowchart which shows the procedure in the case of deleting the data memorize | stored in the exclusion list memory | storage part, if there exists a change instruction | indication of the content of a connection setting memory | storage part. 6 is a flowchart showing a procedure for deleting data stored in an exclusion list storage unit when there is an access point search instruction. The flowchart which shows the procedure in the case of deleting the data memorize | stored in the exclusion list memory | storage part, when there exists the designation | designated connection instruction of an access point. The flowchart which shows the procedure in the case of deleting the data memorize | stored in the exclusion list memory | storage part, when there exists a utilization request | requirement of the function relevant to wireless LAN connection. The flowchart which shows the procedure in the case of deleting the data memorize | stored in the exclusion list | wrist memory | storage part, when the period of the automatic search process of the access point produced by becoming out of the area of WLAN becomes the maximum. The flowchart which shows the procedure in the case of deleting the data memorize | stored in the exclusion list memory | storage part, if the access point which has another SSID memorize | stored in the connection setting memory | storage part is discovered.

  Embodiments of a portable terminal device and a wireless LAN connection method of the device according to the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a schematic overall configuration diagram showing an embodiment of a mobile terminal device according to the present invention. The present invention can be applied to various portable terminal devices that can be connected to a wireless LAN. In the present embodiment, an example in which a mobile phone is used as the mobile terminal device according to the present invention will be described.

  The mobile phone 10 establishes a WLAN connection with an access point (hereinafter referred to as AP) in accordance with each method of the IEEE 802.11 series (IEEE 802.11a / b / g / j / n, etc.), thereby establishing an access point (hereinafter referred to as AP). ) And other mobile terminal devices capable of WLAN connection (in ad hoc mode), etc., by establishing a WLAN connection, data can be transmitted and received by wireless communication (hereinafter referred to as WLAN communication).

  In the following description, an example in which the first AP 11, the second AP 12, and the third AP 13 as the base unit exist around the mobile phone 10 will be described. Note that the first AP 11 and the third AP 13 are user-desired master units, and the second AP 12 is an unnecessary master unit unknown to the user. FIG. 1 shows an example in which the mobile phone 10 is located at a position where WLAN communication with the first AP 11 and the second AP 12 is possible and is not possible with the third AP 13.

  The APs 11 to 13 construct the LAN 100. The LAN 100 is connected to the Internet network 101 by wire or wireless.

  Each AP 11 to 13 has an SSID (including service set identifier and ESSID), a basic service set identifier (Basic SSID, hereinafter referred to as BSSID) unique to each device, which is configured by a MAC address and the like. In the following description, for convenience, both the SSID and BSSID are expressed by a three-digit alphabet character string.

  As shown in FIG. 1, the first AP 11 as a desired parent device has ABC as the SSID and abc as the BSSID. The second AP 12 as an unnecessary parent device has ABC, which is the same SSID as the first AP 11, and def as the BSSID. Further, the third AP 13 as a desired parent device has XYZ as the SSID and xyz as the BSSID. Note that an unnecessary parent device refers to a parent device that may interfere with a WLAN connection process with a desired parent device.

  The cellular phone 10 includes a connecting unit 23 that connects the first unit 21 to the first unit 21, the second unit 22, and the second unit 22 so that the first unit 21 can be freely opened and closed.

  As shown in FIG. 1, the second unit 22 is connected to the first unit 21 via a connecting portion 23 (hinge) so as to be openable / closable around an opening / closing axis. By rotating the second casing 22 about the opening / closing axis, the mobile phone 20 can be positioned in an open state (see FIG. 1) and a closed state.

  The first unit 21 has a thin box-shaped housing, and an input unit 24 and a microphone 25 are provided on the upper surface of the housing. The second unit 22 has a thin box-shaped housing, and a display unit 26 and a receiver 27 are provided on the upper surface of the housing.

  The input unit 24 is configured by a general input device such as a numeric keypad or a touch panel, and outputs a signal corresponding to a user input operation. In addition, you may comprise a part of input part 24 by a rotation input part. The rotation input unit is an input device that outputs a signal according to a rotation operation, and is configured by, for example, a magnetic rotary encoder. This rotation input unit is operated by a user through, for example, a rotation ring, and outputs a rotation signal according to the normal and reverse rotation directions each time the rotation input unit rotates by a predetermined rotation amount.

  The microphone 25 converts voice input by the user into a digital voice signal.

  The display unit 26 is configured by a general display output device such as a liquid crystal display or an OLED (Organic Light Emitting Device) display, for example, and displays a background image (wallpaper) of the display unit 26, a remaining battery level and radio waves superimposed on the wallpaper. Various icons such as an image that schematically shows the intensity, and an image and video that are displayed when an incoming call is received are displayed.

  The receiver 27 outputs sound corresponding to various information including received voice.

  FIG. 2 is a block diagram schematically showing an internal configuration example of the mobile phone 10 and the first AP 11. Note that the configuration of the second AP 12 and the third AP 13 is the same as that of the first AP 11, and thus the description thereof is omitted.

  The mobile phone 10 includes at least a mobile communication antenna 31, a mobile communication unit 32, a WLAN communication antenna 33, a WLAN communication unit, in addition to the input unit 24, the microphone 25, the display unit 26, the receiver 27, and the like shown in FIG. 34, a received signal strength measuring unit 35, a connection setting storage unit 36, an exclusion list storage unit 37, and a main control unit 38.

  The first AP 11 includes a WLAN communication antenna 41, a WLAN communication unit 42, a connection control unit 43, and an identifier storage unit 44.

  The mobile communication unit 32 is controlled by the main control unit 38 to transmit and receive voice and data via the mobile communication network 102 via the mobile communication antenna 31.

  The WLAN communication unit 34 is controlled by the main control unit 38 to transmit / receive data to / from the base unit via the WLAN communication antenna 33. For example, the WLAN communication unit 34 transmits / receives data to / from the WLAN communication unit 42 of the first AP 11 via the WLAN communication antenna 33 and the WLAN communication antenna unit 41 of the first AP 11.

  The connection control unit 43 of the first AP 11 is configured by a signal including information on its own SSID (ABC) and BSSID (abc) stored in the identifier storage unit 44 in response to a probe request from the mobile phone 10. The probe response is transmitted to the mobile phone 10.

  The received signal strength measuring unit 35 measures the received strength (RSSI) of a signal received from the base unit such as the first to third APs 11 to 13 received by the WLAN communication antenna 33, and the RSSI value is used as a main control unit. 38.

  The connection setting storage unit 36 stores the SSID information of the desired parent device and the authentication key information in advance in association with each other. In the present embodiment, the SSID (ABC) and authentication key (abc) of the first AP 11 and the SSID (XYZ) and authentication key (xyz) of the third AP 13 are stored in the connection setting storage unit 36 in advance. An example of the case will be described.

  The exclusion list storage unit 37 is controlled by the main control unit 38 and stores a predetermined BSSID. The predetermined BSSID is a BSSID of the base unit unnecessary for the user.

  The main control unit 38 is configured by a storage medium such as a CPU, a RAM, and a ROM, and controls the operation of the mobile phone 10 according to a program stored in the storage medium.

  The CPU of the main control unit 38 loads a WLAN connection program stored in a storage medium such as a ROM and data necessary for the execution of the program into the RAM, and a plurality of the same SSIDs according to the program. Even if a parent device exists, a process for reliably establishing a WLAN connection with a desired parent device is executed.

  The RAM of the main control unit 38 provides a work area for temporarily storing programs and data executed by the CPU of the main control unit 38.

  The storage medium including the ROM of the main control unit 38 stores a startup program for the mobile phone 10, a WLAN application program, a WLAN protocol control program, an IP management program, and various data necessary for executing these programs. .

  Note that ROM and other storage media include CPU-readable recording media such as magnetic or optical recording media, semiconductor memories, and UIM (User Identity Module) cards installed in card slots (not shown). The program and data in the storage medium may be partly or wholly downloaded via an electronic network.

  Here, the electronic network means an entire information communication network using telecommunications technology. In addition to a wired / wireless LAN and the Internet network 101, a telephone including a communication network constructed by BT communication and a mobile communication network 102. Communication network, optical fiber communication network, cable communication network, satellite communication network, etc. are included.

  FIG. 3 is a schematic block diagram illustrating a configuration example of the function realization unit by the CPU of the main control unit 38. In addition, this function realization part may be comprised by hardware logics, such as a circuit, without using CPU.

  The CPU of the main control unit 38 functions as the WLAN communication management unit 51 by the WLAN application program and functions as the WLAN protocol control unit 52 by the WLAN protocol control program. The WLAN protocol control unit includes a scan control unit 53, an identifier acquisition unit 54, a connection target list creation unit 55, an association processing unit 56, an authentication processing unit 57, a connection establishment unit 58, and a list deletion unit 59. The CPU of the main control unit 38 functions as the IP management unit 60 by the IP management program. Each of the units 51 to 60 uses a required work area of the RAM as a temporary storage location for data.

  The WLAN communication management unit 51 manages all information related to WLAN communication including WLAN connection of the mobile phone 10. The WLAN communication management unit 51 presents information related to the WLAN communication to the user via the display unit 26, and receives instructions from the user regarding various settings related to the WLAN connection. Specifically, for example, the WLAN communication management unit 51 displays an image for performing various settings for WLAN connection on the display unit 26. The user performs a manual search for the master unit via the WLAN protocol control unit 52 and the WLAN communication unit 34 by giving an instruction via the input unit 24 based on the image, or registration information of a desired master unit. Various instructions related to the WLAN connection such as editing (SSID and authentication key) can be given to the mobile phone 10.

  The WLAN protocol control unit 52 is controlled by the WLAN communication management unit 51 and performs WLAN communication with the parent device in cooperation with the WLAN communication unit 34.

  The scan control unit 53 scans a usable frequency band under the control of the WLAN communication management unit 51, and wirelessly transmits a signal including SSID information and BSSID information from each of the parent devices existing at a distance where WLAN communication is possible. Try to receive.

For example, when there is an instruction from the WLAN communication management unit 51 to perform an active scan by specifying an SSID, the scan control unit 53 broadcasts the SSID stored in the connection setting storage unit 36 and performs a probe request. Waits for a probe response from the parent device having the SSID. The probe response is composed of a signal including information on the SSID and BSSID of the parent device. When performing so-called active scanning by ANY, the scan control unit 53 waits for a probe response from the parent device that permits ANY connection. Further, the scan control unit 53 may perform passive scanning. When performing passive scanning, if the SSID information is not included in the beacon, the scan control unit 53 transmits the SSID stored in the connection setting storage unit 36 to the parent device that has transmitted the beacon. Further, when the SSID information is included in the beacon, the connection setting storage unit 36 may not include any SSID, but only the authentication key information may be stored, and the scan control unit 53 may include the beacon. Send the included SSID. When the SSID matches, the base unit transmits a signal including the SSID and BSSID to the mobile phone 10.

  The identifier acquisition unit 54 extracts and acquires the SSID and BSSID from the signal received from the parent device, and provides the connection target list creation unit 55 with the SSID and BSSID.

  The connection target list creating unit 55 receives RSSI (received signal strength) information for each parent device from the received signal strength measuring unit 35. In addition, the SSID and BSSID information is received from the identifier acquisition unit 54. Based on these pieces of information, the connection target list creating unit 55 is a list of connection trial targets (hereinafter referred to as a connection list) consisting of a parent device that has transmitted a signal including the same SSID as the SSID stored in the connection setting storage unit. Create The connection target list creation unit 55 adds priorities from the connection list in descending order of RSSI strength.

  The association processing unit 56 sets the base units existing in the connection list created by the connection target list creation unit 55 as connection trial targets in order from the base unit with the highest priority (high RSSI), and cooperates with the base unit to perform BSSID. Try the association process using. If there is a BSSID stored in the exclusion list storage unit 37, the association processing unit 56 excludes the parent device that has transmitted the BSSID stored in the exclusion list storage unit 37 from the processing target.

  The authentication processing unit 57 searches the connection setting storage unit 36 using the SSID acquired by the identifier acquisition unit 54 from the signal received from the parent device for the parent device that has succeeded in the association processing, and the authentication associated with the SSID. Extract the key. Using this authentication key, the authentication processing unit 57 performs authentication by WPA in cooperation with the parent device.

  When the authentication processing by the authentication processing unit 57 fails, the connection establishing unit 58 stores the BSSID of the failed connection attempt target base unit in the exclusion list storage unit 37 and controls the scan control unit 53 to enable WLAN communication. The wireless reception of a signal including SSID information and BSSID information is retried from each of the parent devices existing at a certain distance. On the other hand, when the authentication processing by the authentication processing unit 57 is successful, the connection establishment unit 58 receives an IP address assignment from the parent device in cooperation with the IP management unit 60 and establishes a WLAN connection with the parent device.

  FIG. 4 is an explanatory diagram showing an example of conditions under which data stored in the exclusion list storage unit 37 is deleted by the list deletion unit 59.

  The list deletion unit 59 deletes the data stored in the exclusion list storage unit 37 according to a predetermined condition (see FIG. 4).

  Even if the BSSID of the desired parent device is stored in the exclusion list storage unit 37 if the authentication fails due to some trouble during the authentication process with the desired parent device. In this case, it is not possible to establish a WLAN connection with a desired parent device. Therefore, the list deletion unit 59 may delete the data in the exclusion list storage unit 37 taking various occasions. Although it is a disadvantage that deleting the data in the exclusion list storage unit 37 again takes time to perform association processing with an unnecessary parent device, it is not possible to establish a WLAN connection with a desired parent device. This is because the shortcoming is considered to be more serious.

  Next, an example of the operation of the mobile phone 10 according to the present embodiment will be described. In the following description, an example in which the mobile phone 10 is in a position where WLAN communication is possible with the first AP 11 and the second AP 12 and is not possible for WLAN communication with the third AP 13 ( (See FIG. 1). The connection setting storage unit 36 stores in advance the SSID (ABC) and authentication key (abc) of the first AP 11 and the SSID (XYZ) and authentication key (xyz) of the third AP 13. And Further, the search for the parent device is performed by active scan designating the SSID stored in the connection setting storage unit 36.

  First, WLAN connection trial processing in the case where there are a plurality of parent devices having the same SSID in the prior art will be described.

  FIG. 5 is a flowchart showing a procedure of a WLAN connection attempt when there are a plurality of parent devices having the same SSID in the prior art.

  In the conventional technique, when there are a plurality of parent devices having the same SSID, if the RSSI of the unnecessary parent device is higher, the WLAN connection with the desired parent device cannot be established. This will be described in detail below.

  In step S <b> 1, the WLAN communication management unit 51 makes an active scan request for ABC and XYZ, which are SSIDs stored in the connection setting storage unit 36, to the WLAN protocol control unit 52.

  Next, in step S <b> 2, the scan control unit 53 issues an active scan request for ABC and XYZ, which are SSIDs stored in the connection setting storage unit 36, to the WLAN communication unit 34.

  Next, in step S <b> 3, the WLAN communication unit 34 performs an active scan for ABC and XYZ, which are SSIDs stored in the connection setting storage unit 36, in cooperation with the scan control unit 53.

  In step S4, the scan control unit 53 receives the result of the active scan via the WLAN communication unit 34. In the present embodiment, the mobile phone 10 is in a position where WLAN communication is possible with the first AP 11 and the second AP 12 and is in a position where WLAN communication is not possible with the third AP 13. For this reason, there is no probe response from the third AP 13 having SSID (XYZ). On the other hand, since the first AP 11 and the second AP 12 have the same SSID (ABC) as the SSID stored in the connection setting storage unit 36, the first AP 11 and the second AP 12 transmit a signal including SSID and BSSID information of their own as a probe response. To do. The scan control unit 53 gives this signal to the identifier acquisition unit 54.

  Next, in step S <b> 5, the connection target list creation unit 55 receives the SSID and BSSID information of the first AP 11 and the second AP 12 from the identifier acquisition unit 54. Further, the received signal strength measurement unit 35 receives RSSI information of signals received from the first AP 11 and the second AP 12. In the example shown in FIG. 1, since the second AP 12 is closer to the mobile phone 10 than the first AP 11, the received signal from the second AP 12 is higher than the received signal from the first AP 11. RSSI is higher. Therefore, the connection target list creation unit 55 creates a connection list that is configured by the SSIDs and BSSIDs of the first AP 11 and the second AP 12 and has a higher connection trial priority of the second AP 12. In step S5, nothing is stored in the exclusion list storage unit 37 yet.

  Next, in step S6, the association processing unit 56 starts with the parent device (second AP 12) having a high priority (high RSSI) for the parent device existing in the connection list created by the connection target list creating unit 55. The connection processing is sequentially performed, and the association process is attempted using BSSID (xyz) in cooperation with the second AP 12. Since the accurate BSSID (xyz) of the second AP 12 has already been acquired by the identifier acquisition unit 54, this association process is successful.

  Next, in step S7, the authentication processing unit 57 searches the connection setting storage unit 36 using the SSID (ABC) acquired by the identifier acquisition unit 54 from the signal received from the second AP 12, and this SSID (ABC) The authentication key (abc) associated with is extracted. The authentication processing unit 57 performs authentication by WPA in cooperation with the second AP 12 using this authentication key.

  The connection setting storage unit 36 stores an authentication key (abc) corresponding to the SSID (ABC) of the first AP 11 that is a desired parent device. This authentication key (abc) is different from the legitimate authentication key (xyz) of the second AP 12. This is because the authentication key is information unique to each parent device. Therefore, this authentication process ends in failure.

  Next, in step S8, the WLAN communication unit 53 receives a Deauth (entication) signal that is a signal indicating that the authentication has failed from the second AP 12.

  Next, in step S <b> 9, the authentication establishment unit 58 receives a Deauth (entication) / Disassoc (iation) signal, which is a signal indicating authentication failure or association failure, from the WLAN communication unit 53.

  Next, in step S <b> 10, the authentication establishment unit 58 transmits a Disassoc signal to the WLAN communication management unit 51.

  Next, in step S11, when the WLAN communication management unit 51 receives the Disassoc signal from the authentication establishment unit 58, the SSID stored in the connection setting storage unit 36 is again transmitted to the WLAN protocol control unit 52 as in step S1. Active scan requests for ABC and XYZ.

  Thereafter, the procedure from step S2 to step S11 (step S1 to step S10) is repeated.

  As is clear from the above procedure, if the association process with one parent device is successful, the procedure returns to the procedure for scanning the available frequency band again even if the subsequent authentication process fails. For this reason, in the conventional technology, when there are a plurality of base units having the same SSID, if the RSSI of the unnecessary base unit is higher, the mobile phone fails in trying to connect to the unnecessary base unit via WLAN. The WLAN connection with the desired base unit cannot be established.

  Therefore, when the authentication process fails after the association process is successful, the mobile phone 10 according to the present embodiment adds the BSSID of the parent device that is the target of the WLAN connection attempt to the exclusion list, and the next WLAN connection or later Remove from trial.

  FIG. 6 is a flowchart illustrating an example of a procedure for reliably establishing a WLAN connection with a desired parent device even when there are a plurality of parent devices having the same SSID in the mobile phone 10 according to the present embodiment. Steps equivalent to those in FIG. 5 are denoted by the same reference numerals, and redundant description is omitted.

  In step S9, when a Deauth (entication) / Disassoc (iation) signal, which is a signal indicating an authentication failure or an association failure, is received from the WLAN communication unit 53, in step S21, the authentication establishing unit 58 selects the failed connection attempt target. The BSSID (xyz) of the second AP 12 that is the parent device is stored in the exclusion list storage unit 37.

  In steps S11 and S22 to S24, after a procedure equivalent to that in steps S1 to S4 is executed, in step S25, the connection target list creation unit 55 creates the same connection list as created in step S5.

  Next, in step S <b> 26, the association processing unit 56 sets the parent devices existing in the connection list created by the connection target list creating unit 55 as connection attempt targets in order from the parent device having the highest priority (higher RSSI). . At this time, the association processing unit 56 excludes, from the processing targets, the second AP 12 that is the parent device that has transmitted the BSSID (xyz) stored in the exclusion list search unit 37 among the parent devices of this list. As a result, the first AP 11 becomes the first connection trial target. For this reason, the association processing unit 56 tries the association processing using the BSSID (abc) in cooperation with the first AP 11. Since the accurate BSSID (abc) of the first AP 12 has already been acquired by the identifier acquisition unit 54, this association process is successful.

  Next, in step S27, the authentication processing unit 57 searches the connection setting storage unit 36 using the SSID (ABC) acquired by the identifier acquisition unit 54 from the signal received from the first AP 11, and this SSID (ABC) The authentication key (abc) associated with is extracted. The authentication processing unit 57 performs authentication by WPA in cooperation with the first AP 11 using this authentication key. This authentication key (abc) is equal to the legitimate authentication key (abc) of the first AP 11. Therefore, this authentication process is successful.

  Next, in step S28, the connection establishment unit 58 receives an IP address assignment from the first AP 11 in cooperation with the IP management unit 60, and establishes a WLAN connection with the first AP 11.

  By adding the BSSID of the parent device that has once failed in the authentication process to the exclusion list by the above procedure, it is possible to reliably establish a WLAN connection with the desired parent device even if there are a plurality of parent devices having the same SSID. .

  FIG. 7 is a flowchart showing another example of a procedure for reliably establishing a WLAN connection with a desired parent device even when there are a plurality of parent devices having the same SSID in the mobile phone 10 according to the present embodiment. Steps equivalent to those in FIG. 6 are denoted by the same reference numerals, and redundant description is omitted.

  After the association process is successful in step S6, in step S31, the authentication processing unit 57 performs authentication by WPA in cooperation with the second AP 12, using the authentication key (abc), as in step S7.

  In step S7 of FIG. 5 and FIG. 7, although the authentication process itself is normally executed, a Deauth (entication) signal is output because the authentication key is different (quasi-normal end).

  On the other hand, in step S31, the authentication process itself is not normally executed (abnormal end). As a cause of this, for example, a malfunction (bug) of the drive software of the parent device can be cited.

  In this case, since a coordinated authentication process cannot be performed because there is no response from the second AP 12, the authentication processing unit 57 gives a signal to the authentication establishing unit 58 that the authentication process has failed in step S32.

  Next, in step S33, the authentication establishment unit 58 stores the BSSID (xyz) of the second AP 12 that is the parent device of the connection attempt target that failed in the authentication processing in the exclusion list storage unit 37, as in step S21. Let

  Next, in step S34, the authentication establishment unit 58 outputs a Disassoc signal to the second AP 12.

  According to the above procedure, even if there is a plurality of parent devices having the same SSID even if the authentication process fails because it cannot cooperate with the second AP 12, the desired parent device is surely obtained. And WLAN connection.

  When the authentication process fails after the association process is successful, the mobile phone 10 according to the present embodiment adds the BSSID of the base unit targeted for the WLAN connection trial to the exclusion list, and the next and subsequent WLAN connection trials. Try to remove it from the target. For this reason, according to the mobile phone 10, even when there are a plurality of parent devices having the same SSID, it is possible to make a WLAN connection with a desired parent device very easily and surely, which is very convenient.

  Next, a procedure for deleting data stored in the exclusion list storage unit 37 according to a predetermined condition (see FIG. 4) will be described.

  Even if it is the BSSID of the desired master unit, if the authentication fails due to some trouble during the authentication process with the desired master unit, or if the user has registered the authentication key by mistake, the exclusion list It may be stored in the storage unit 37. In this case, it is not possible to establish a WLAN connection with a desired parent device.

  The exclusion list is easily created along with the scanning operation. For this reason, it is preferable to delete the data in the exclusion list storage unit 37 taking into account the various opportunities as much as possible, focusing on the disadvantage of being unable to establish a WLAN connection with a desired parent device.

  8 to 11 are examples in the case where the data stored in the exclusion list storage unit 37 is deleted due to the operation of the input unit by the user. FIG. 12 and FIG. 13 are examples in the case of deleting data stored in the exclusion list storage unit 37 due to other conditions.

  FIG. 8 is a flowchart showing a procedure for deleting data stored in the exclusion list storage unit 37 when there is an instruction to change the contents of the connection setting storage unit 36.

  As shown in FIG. 8, when the user gives an instruction to change the access point registration information, which is the content of the connection setting storage unit 36, via the input unit 24 (step S41), the WLAN communication management unit 51 instructs the user. The contents of the connection setting storage unit 36 are changed according to (Step S42). The list deletion unit 59 of the WLAN protocol control unit 52 receives information indicating that the registration information of the access point has been changed from the WLAN communication management unit 51 (step S43), and deletes the data stored in the exclusion list storage unit 37 ( Step S44).

  FIG. 9 is a flowchart showing a procedure for deleting data stored in the exclusion list storage unit 37 when there is an access point search instruction.

  When the user issues an access point search instruction via the input unit 24 (step S51), the WLAN communication management unit 51 makes an access point search request to the WLAN protocol control unit 52 according to the user instruction (step S52). ). In response to this search request, the list deletion unit 59 deletes the data stored in the exclusion list storage unit 37 (step S53), and the scan control unit 53 searches for an access point (step S54).

  FIG. 10 is a flowchart showing a procedure for deleting data stored in the exclusion list storage unit 37 when there is an access point designation connection instruction.

  When there is an access point designated connection instruction (SSID-designated active scan instruction) via the input unit 24 by the user (step S61), the WLAN communication management unit 51 sends a list deletion unit 59 to the exclusion list storage unit 37. Request to delete the stored data (step S62). In response to this request, the list deletion unit 59 deletes the data stored in the exclusion list storage unit 37 (step S63). Subsequently, the WLAN communication management unit 51 makes an access point designation connection request to the WLAN protocol control unit 52 (step S64). Upon receiving this request, the scan control unit 53 searches for the designated access point (step S65).

  FIG. 11 is a flowchart illustrating a procedure for deleting data stored in the exclusion list storage unit 37 when there is a use request for a function related to wireless LAN connection.

  When a user requests use of a function related to wireless LAN connection via the input unit 24 (step S71), the WLAN communication management unit 51 uses the display unit 26 to display an image containing information related to WLAN communication. (Step S72). Examples of this type of image include images such as a setting menu, a connection menu, and a registration information menu for performing settings related to the wireless LAN. Upon receiving an image display instruction for performing settings related to these wireless LANs, the WLAN communication management unit 51 requests the list deletion unit 59 to delete the data stored in the exclusion list storage unit 37 (step). S73). In response to this request, the list deletion unit 59 deletes the data stored in the exclusion list storage unit 37 (step S74).

  FIG. 12 is a flowchart illustrating a procedure for deleting data stored in the exclusion list storage unit 37 when the period of the automatic access point search processing that occurs when the WLAN is out of service is maximized.

  When the interval of the automatic access point search processing (out-of-service scan) that occurs when the WLAN is out of service reaches the maximum time (step S81), the WLAN communication management unit 51 notifies the list deletion unit 59 of the exclusion list storage unit 37. Is requested to be deleted (step S82). In response to this request, the list deletion unit 59 deletes the data stored in the exclusion list storage unit 37 (step S83), and the scan control unit 53 searches for an access point (step S84).

  FIG. 13 is a flowchart showing a procedure for deleting data stored in the exclusion list storage unit 37 when an access point having another SSID stored in the connection setting storage unit 36 is found.

  For example, in the example illustrated in FIG. 1, when the mobile phone 10 approaches the third AP 13 and finds a third AP 13 having an SSID (XYZ) different from the SSID (ABC), the exclusion list storage unit 37. The data stored in is deleted.

  The WLAN communication management unit 51 makes an active scan request for ABC and XYZ SSIDs stored in the connection setting storage unit 36 or an active scan request by ANY to the WLAN protocol control unit 52 (step S91). Next, the WLAN communication unit 34 performs active scan in cooperation with the scan control unit 53 (step S92). As a result, when a new access point is included in the connection list created by the connection target list creation unit 55 (step S93), the list deletion unit 59 deletes the data stored in the exclusion list storage unit 37 (step S93). S94). Then, a connection attempt including association processing is started (step S95).

  The example illustrated in FIG. 13 is an example of a procedure for deleting data stored in the exclusion list storage unit 37 when a new access point is included in the connection list created by the connection target list creation unit 55. For this reason, the scan request in step S91 may be a passive scan request.

  With the above procedure, the data stored in the exclusion list storage unit 37 can be deleted under various conditions. For this reason, even if the BSSID of a desired access point is stored in the exclusion list storage unit 37 against the user's intention, the contents of the exclusion list storage unit 37 are deleted by capturing various opportunities. The bad effect of not being able to connect to other access points can be prevented.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. In addition, various inventions can be formed by appropriately combining a plurality of components disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment.

  For example, the present invention can be applied to various portable terminal devices in addition to the cellular phone 10 described in the present embodiment, and in particular, a notebook personal computer PDA (Personal Digital Assistant), a portable game machine. It can be applied to portable terminal devices such as portable music players and portable video players.

  In the above embodiment, an example in which an access point is applied as a parent device has been described. However, as long as the devices are compatible with the ad hoc mode, the parent device may be a mobile terminal device.

  Further, in the embodiment of the present invention, each step of the flowchart shows an example of processing that is performed in time series in the order described. The process to be executed is also included.

10 mobile phone 11 first access point (desired parent device)
12 Second access point 13 Third access point (desired master)
21 First unit 22 Second unit 23 Connection unit 24 Input unit 25 Microphone 26 Display unit 27 Receiver 31 Mobile communication antenna 32 Mobile communication unit 33 WLAN communication antenna 34 WLAN communication unit 35 Received signal strength measurement unit 36 Connection setting storage unit 37 Exclusion list storage unit 38 Main control unit 41 WLAN communication antenna 42 WLAN communication unit 43 Connection control unit 44 Identifier storage unit 51 WLAN communication management unit 52 WLAN protocol control unit 53 Scan control unit 54 Identifier acquisition unit 55 Connection Target list creation unit 56 Association processing unit 57 Authentication processing unit 58 Connection establishment unit 59 List deletion unit 60 IP management unit 100 LAN
101 Internet network 102 Mobile communication network

Claims (8)

A connection setting storage unit storing information of an authentication key of a desired parent device;
An exclusion list storage unit for storing information on a predetermined basic service set identifier;
A scan control unit that attempts to wirelessly receive a signal including service set identifier information and basic service set identifier information from each of one or more master units;
A received signal strength measuring unit that measures the received strength of the signal received from each of the one or more master units;
An identifier acquisition unit for acquiring information on the service set identifier and information on the basic service set identifier from the signal;
The reception strength is high for the one or more parent devices except the parent device that has given the signal including the information of the basic service set identifier that is the same as the predetermined basic service set identifier stored in the exclusion list storage unit The wireless LAN connection is a trial target in order from the parent device that gave the signal, and the parent of the connection trial target using the information of the basic service set identifier included in the signal given from the parent device that is the connection trial target An association processing unit that performs association processing in cooperation with the machine,
When the association process is successful, an authentication processing unit that performs an authentication process using the authentication key stored in the connection setting storage unit in cooperation with the parent device that is the connection trial target;
If the authentication process fails, the exclusion list storage unit uses the basic service set identifier acquired by the identifier acquisition unit from the signal given from the connection target parent device as one of the predetermined basic service set identifiers. And when the authentication process is successful, the base unit to be connected is determined to be the desired base unit, and this base unit is controlled. And a connection establishment unit for establishing a wireless LAN connection;
A portable terminal device comprising: A connection setting storage unit that stores information on a service set identifier of a desired parent device and information on an authentication key in association with each other;
An exclusion list storage unit for storing information on a predetermined basic service set identifier;
A scan control unit that attempts to wirelessly receive a signal including service set identifier information and basic service set identifier information from each of one or more master units;
A received signal strength measuring unit that measures the received strength of the signal received from each of the one or more master units;
An identifier acquisition unit for acquiring information on the service set identifier and information on the basic service set identifier from the signal;
The predetermined basic service stored in the exclusion list storage unit among the parent units that have given the signal including the same service set identifier as the service set identifier of the desired parent unit stored in the connection setting storage unit For one or a plurality of master units excluding the master unit that has given the signal including the basic service set identifier information that is the same as the set identifier, the wireless LAN connection is tried in order from the master unit that has given the signal having the highest reception strength. An association processing unit that performs association processing in cooperation with the connection attempt target base unit using information on the basic service set identifier included in the signal given from the connection target target base unit;
When the association processing is successful, the connection setting storage unit is searched using the service set identifier included in the signal given from the connection-targeted master unit, and the authentication associated with the service set identifier is performed. An authentication processing unit that extracts a key and performs an authentication process in cooperation with the connection target parent device using the extracted authentication key;
If the authentication process fails, the exclusion list storage unit uses the basic service set identifier acquired by the identifier acquisition unit from the signal given from the connection target parent device as one of the predetermined basic service set identifiers. And when the authentication process is successful, the base unit to be connected is determined to be the desired base unit, and this base unit is controlled. And a connection establishment unit for establishing a wireless LAN connection;
A portable terminal device comprising: An input unit for receiving an input operation related to setting of a wireless LAN connection with one of the one or more master units;
When an input operation related to setting of a wireless LAN connection is accepted via the input unit, a list deletion unit that deletes information on the predetermined basic service set identifier from the exclusion list storage unit;
Further comprising
The input operation related to the setting of the wireless LAN connection is as follows:
Including at least editing of the authentication key, an instruction to wirelessly receive the signal to the scan control unit, and an instruction to display an image for performing settings related to the wireless LAN.
The portable terminal device according to claim 1 or 2. A list deletion unit that deletes information of the predetermined basic service set identifier from the exclusion list storage unit, when at least wireless reception of the signal by the scan control unit is malfunctioning for a predetermined time or more,
Further equipped with,
The mobile terminal device according to claim 1. A wireless LAN connection method for a portable terminal device that performs wireless LAN connection with a desired parent device,
Storing information of an authentication key of a desired master in the connection setting storage unit;
Storing information of a predetermined basic service set identifier in an exclusion list storage unit;
Attempting to wirelessly receive a signal including service set identifier information and basic service set identifier information from each of the one or more base units;
Measuring the received strength of the signal received from each of the one or more master units;
Obtaining the service set identifier information and the basic service set identifier information from the signal;
The reception strength is high for the one or more parent devices except the parent device that has given the signal including the information of the basic service set identifier that is the same as the predetermined basic service set identifier stored in the exclusion list storage unit The wireless LAN connection is a trial target in order from the parent device that gave the signal, and the parent of the connection trial target using the information of the basic service set identifier included in the signal given from the parent device that is the connection trial target and the step of performing the association process in cooperation with the machine,
When the association process is successful, performing an authentication process using the authentication key stored in the connection setting storage unit in cooperation with the connection target parent unit;
If the authentication process fails in the step of performing the authentication process, the basic service set identifier obtained from the signal given from the connection target parent unit is excluded as the predetermined basic service set identifier. Returning to the step of storing in the list storage unit and attempting to wirelessly receive the signal;
When the authentication process is successful in the step of performing the authentication process, determining the connection target parent device as the desired parent device, and establishing a wireless LAN connection with the parent device;
A wireless LAN connection method comprising: A wireless LAN connection method for a portable terminal device that performs wireless LAN connection with a desired parent device,
Associating the service set identifier information of the desired base unit with the authentication key information and storing them in the connection setting storage unit;
Storing information of a predetermined basic service set identifier in an exclusion list storage unit;
Attempting to wirelessly receive a signal including service set identifier information and basic service set identifier information from each of the one or more base units;
Measuring the received strength of the signal received from each of the one or more master units;
Obtaining the service set identifier information and the basic service set identifier information from the signal;
The reception strength is high for the one or more parent devices except the parent device that has given the signal including the information of the basic service set identifier that is the same as the predetermined basic service set identifier stored in the exclusion list storage unit The wireless LAN connection is a trial target in order from the parent device that gave the signal, and the parent of the connection trial target using the information of the basic service set identifier included in the signal given from the parent device that is the connection trial target Performing association processing in cooperation with the machine,
When the association processing is successful, the connection setting storage unit is searched using the service set identifier included in the signal given from the connection-targeted master unit, and the authentication associated with the service set identifier is performed. Extracting a key, and performing an authentication process in cooperation with the parent device to be connected using the extracted authentication key;
If the authentication process fails in the step of performing the authentication process, the basic service set identifier obtained from the signal given from the connection target parent unit is excluded as the predetermined basic service set identifier. Returning to the step of storing in the list storage unit and attempting to wirelessly receive the signal;
When the authentication process is successful in the step of performing the authentication process, determining the connection target parent device as the desired parent device, and establishing a wireless LAN connection with the parent device;
A wireless LAN connection method comprising: A step of deleting the information of the predetermined basic service set identifier from the exclusion list storage unit when an input operation related to setting of a wireless LAN connection with one of the one or more parent devices is accepted;
Further comprising
The input operation related to the setting of the wireless LAN connection is as follows:
Including at least editing of the authentication key, an instruction to wirelessly receive the signal to the scan control unit, and an instruction to display an image for performing settings related to the wireless LAN,
The wireless LAN connection method according to claim 5 or 6. Deleting at least the information of the predetermined basic service set identifier from the exclusion list storage unit when wireless reception of the signal by the scan control unit is malfunctioning for a predetermined time or more;
Further having
The wireless LAN connection method according to claim 5 or 6.

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