JP2011239289A - Radio communication equipment, projector, and radio communication method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radio communication equipment etc. which can be more securely connected when connecting to an access point which has an SSID non-public setting.SOLUTION: Radio communication equipment 110 comprises; a radio communication part 120 to broadcast-transmit first request information which does not specify network identification information in order to receive first response information; an update part 130 to update scan list data 142 regarding access points based on the first response information; a judgement part 160 to judge whether there is an access point whose SSID is non-public based on the scan list data 142; and a control part 150 to cause, when the judgement part 160 judges that there is an access point whose SSID is non-public, the radio communication part 120 to broadcast-transmit second request information which specifies a BSSID included in the scan list data 142 which corresponds to the access point.

Description

  The present invention relates to a wireless communication device, a projector, and a wireless communication method.

  As a wireless LAN communication method, there are an ad hoc mode in which wireless communication devices directly communicate with each other without using an access point, and an infrastructure mode in which wireless communication devices communicate with each other through an access point. In the infrastructure mode, a method of connecting to an access point using an SSID (also referred to as Service Set Identifier, ESSID) is generally used to ensure security. For example, Japanese Patent Laid-Open No. 2005-176100 describes a communication terminal that accepts an SSID input and connects to an access point by performing search communication using the SSID.

JP-A-2005-176100

  However, when SSID non-disclosure setting (SSID stealth, SSID non-notification) is performed at the access point, even if search communication using SSID is performed, no response is obtained from the access point, and connection from the access point is established. Necessary information is not obtained. In particular, a projector or the like does not have a function of displaying a list of connection destination access points because a wireless communication device such as a notebook PC (Personal Computer) is not generally incorporated. For this reason, the user may not be able to connect the projector or the like to the access point for which the SSID private setting is performed.

  Some aspects according to the present invention provide a wireless communication device, a projector, and a wireless communication device that can connect more reliably when connecting to an access point for which SSID non-disclosure setting has been performed by solving the above-described problems. A communication method is provided.

  A wireless communication apparatus according to one aspect of the present invention includes: a wireless communication unit that receives first response information related to an access point by broadcasting first request information not specifying network identification information; An update unit that updates scan list data related to the access point based on the response information of 1, a determination unit that determines whether there is an access point whose SSID is private based on the scan list data, If the determination unit determines that there is an access point whose SSID is not disclosed, second request information specifying a BSSID (Basic Service Set Identifier) included in the scan list data corresponding to the access point A control unit that causes the wireless communication unit to perform broadcast transmission. The wireless communication unit receives the second response information including the SSID related to the access point where the SSID is private by broadcasting the second request information, and the updating unit The scan list data is updated based on second response information.

  According to another aspect of the present invention, a projector includes the above wireless communication device.

  According to another aspect of the present invention, there is provided a wireless communication method in which a wireless communication apparatus broadcasts first request information not specifying network identification information, receives first response information related to an access point, Based on the first response information, the scan list data related to the access point is updated, and based on the scan list data, it is determined whether there is an access point whose SSID is private, and the SSID is private. When there is an access point, the second request information specifying the BSSID included in the scan list data corresponding to the access point is broadcasted, and the SSID related to the access point whose SSID is not disclosed is transmitted. Receiving the second response information including the second response information Based, and updates the scan list data.

  According to the present invention, the wireless communication device or the like can obtain sufficient information regarding the access point for which the SSID private setting has been performed by transmitting the request information specifying the BSSID and receiving the response information. This information can be reflected in the scan list data. By connecting to an access point using the scan list data, a wireless communication device or the like can be connected more reliably when connecting to an access point for which SSID non-disclosure setting has been performed.

  In addition, the wireless communication device includes an input unit to which an SSID is input, and the determination unit determines whether there is an access point having an SSID that matches the SSID input to the input unit based on the scan list data May be determined. According to this, the wireless communication apparatus or the like can determine whether or not the SSID of the access point matches the input SSID even for the access point for which the SSID private setting is performed.

  In addition, when the determination unit determines that there is an access point having an SSID that matches the SSID input to the input unit by the determination unit, the control unit controls the wireless communication unit to connect to the access point. May be. According to this, a wireless communication device or the like can connect to an access point for which SSID non-public setting is performed by connecting to the access point when the SSID of the access point matches the input SSID. It is possible to connect more reliably while securing the above.

  In addition, the projector projects a designated image that accepts designation of the SSID, a acceptance unit that accepts designation of the SSID, and an output unit that outputs the SSID accepted by the accepting unit to the input unit , May be included. According to this, when the SSID designated by the user matches the input SSID, the projector can be connected more reliably while securing security by connecting to the access point.

  In addition, the projector may include a projection unit that projects a determination result image indicating the presence or absence of an access point having an SSID that matches the SSID input to the input unit. According to this, the user can determine whether there is an access point that matches the SSID designated by the user.

  The projection unit may not have a function of displaying a list of access points based on the scan list data. According to this, even when the projector does not have the access point list display function based on the scan list data, the projector can connect more reliably when connecting to the access point for which the SSID non-public setting is performed. Can do.

It is a figure which shows the communication condition in a 1st Example. It is a functional block diagram of the projector in a 1st Example. It is a flowchart which shows the radio | wireless communication procedure in a 1st Example. It is a figure which shows an example of the wireless LAN setting image in a 1st Example. It is a figure which shows an example of the security setting image in a 1st Example. It is a figure which shows an example of the setting completion image in 1st Example. It is a figure which shows an example of the warning image in a 1st Example. It is a figure which shows an example of the status notification image in a 1st Example.

  Embodiments in which the present invention is applied to a projector will be described below with reference to the drawings. In addition, the Example shown below does not limit the content of the invention described in the claim at all. In addition, all the configurations shown in the following embodiments are not necessarily essential as means for solving the invention described in the claims.

(First embodiment)
FIG. 1 is a diagram illustrating a communication status in the first embodiment. The projector 100 wirelessly connects to the access point 300 with the detachable wireless communication device 110 inserted into the USB slot of the projector 100. The PC 200 is connected to the access point 300 wirelessly. The projector 100 projects the image 20 on the screen 10 based on the image information from the PC 200 transmitted via the access point 300. Actually, there are a plurality of access points other than the access point 300.

  When such a wireless network is configured, each wireless network is identified by using the SSID. Further, when connecting to the access point 300, the projector 100 or the like obtains information necessary for connection by transmitting a probe request packet or the like and receiving a probe response packet or the like. However, when the SSID is set to be private at the access point 300, the projector 100 or the like can be connected from the access point 300 even if it broadcasts a probe request packet for which network identification information such as SSID is not specified. I can't get the information I need. In this embodiment, the projector 100 has a function of obtaining information necessary for connection from the access point 300 corresponding to the BSSID by broadcasting a probe request packet designating the BSSID. Next, functional blocks of the projector 100 having such functions will be described.

  FIG. 2 is a functional block diagram of the projector 100 according to the first embodiment. The projector 100 includes a wireless communication device 110, a USB interface unit 172 having a function as an output unit, a projection unit 190 that projects an image 20, and a reception unit 180 that receives a user instruction. The wireless communication device 110 includes a wireless communication unit 120, a storage unit 140 that stores scan list data 142, network setting data 144, and the like, an update unit 130 that updates the scan list data 142, and the like, a wireless communication unit 120, and the like. And a USB interface unit 170 having a function as an input unit. The scan list data 142 is data indicating information on the access point, and the network setting data 144 is data indicating a communication method or the like in the projector 100.

  The projector 100 may function as each of these units using the following hardware. For example, in the projector 100, the wireless communication unit 120 is a wireless communication unit, the update unit 130, the control unit 150, the determination unit 160 is a CPU, the storage unit 140 is a non-volatile memory, the USB interface units 170 and 172 are USB interfaces, and the like. The reception unit 180 may use a light receiving unit, operation buttons, and the like. The projection unit 190 may use an image processing circuit, a lamp, a liquid crystal panel, a liquid crystal driving circuit, a lens, and the like.

  Next, a wireless communication procedure in the present embodiment will be described. FIG. 3 is a flowchart showing a wireless communication procedure in the first embodiment. FIG. 4 is a diagram illustrating an example of a wireless LAN setting image (designated image) 410 in the first embodiment. FIG. 5 is a diagram illustrating an example of the security setting image 420 in the first embodiment. FIG. 6 is a diagram illustrating an example of the setting completion image 430 in the first embodiment.

  The user operates the remote controller (remote controller) of the projector 100 to cause the projector 100 to project an environment setting menu image, and selects the network setting menu from the environment setting menu. The projection unit 190 projects a network setting image (wireless LAN setting image 410, security setting image 420, setting completion image 430, etc.) based on the information indicating that the network setting menu has been selected from the reception unit 180 (steps). S1). The network setting image is a kind of OSD (On Screen Display) image.

  For example, when the wireless LAN is selected in the network setting image, the projection unit 190 projects the image 400 including the wireless LAN setting image 410. In the example shown in FIG. 4, the manual mode (infrastructure mode) is selected as the connection mode in the sub-menu for setting the wireless LAN, and the SSID is input. The network setting image 410 in FIG. 4 is simplified, but actually includes an IP address input field and the like.

  When security is selected in the network setting image, the projection unit 190 projects an image 401 including the security setting image 420. The security setting image 420 includes an image for selecting an encryption method such as WEP (Wired Equivalent Privacy), WPA (Wi-Fi Protected Access), or EAP (Extensible Authentication Protocol). Note that the projection unit 190 projects an image for inputting a user name, a password, an electronic certificate, or the like according to the selected encryption method.

  When selection completion is selected in the network setting image, the projection unit 190 projects the image 402 including the setting completion image 430. The determination unit 160 determines whether the network setting is completed based on the information from the reception unit 180 (step S2). Note that the updating unit 130 stores network setting data 144 indicating network settings including the input SSID and the like in the storage unit 140.

  When the network setting is completed, the control unit 150 controls the wireless communication unit 120 to broadcast-transmit a first request packet that does not specify network identification information (such as SSID) (step S3). The wireless communication unit 120 receives a first response packet that is a response to the first request packet from the access point 300 or the like (step S4). The updating unit 130 updates the scan list data 142 based on the first response packet (step S5). When the access point receives the first request packet, the access point stores and transmits the SSID and BSSID of the access point in the payload of the first response packet. Generally, a MAC (Media Access Control) address is used as the BSSID. The access point for which the private SSID is set transmits NULL (null value) as the SSID in the payload of the first response packet. The update unit 130 registers the SSID and BSSID included in the first response packet received from the access point in the scan list data 142.

  The determination unit 160 determines whether there is data in which the SSID value is NULL in the scan list data 142 (step S6). Data in which the SSID value in the scan list data 142 is NULL is data relating to the access point for which the private SSID is set.

  When there is an access point for which the private SSID is set, the control unit 150 controls the wireless communication unit 120 to broadcast-transmit the second request packet specifying the BSSID included in the data (step S7). . The wireless communication unit 120 receives a second response packet that is a response to the second request packet from the access point 300 having the BSSID (step S8). When the access point for which the private SSID is set receives the second request packet, the access point stores the SSID of the access point in the payload of the second response packet and transmits it. The updating unit 130 updates the scan list data 142 based on the second response packet received from the access point for which the private SSID is set (step S9). The projector 100 repeatedly executes the processes of steps S6 to S9 until there is no more SSID value NULL in the scan list data 142.

  When there is no more SSID data in the scan list data 142, the determination unit 160 uses the scan list data 142 and the network setting data 144 to store data of an access point having an SSID that matches the input SSID. It is determined whether or not it is in the scan list data 142 (step S10). When the SSIDs match, the control unit 150 causes the wireless communication unit 120 to unicast the third request packet specifying the SSID and the BSSID corresponding to the SSID based on the scan list data 142 (step S11).

  On the other hand, when the SSIDs do not match, the determination unit 160 outputs information indicating that the SSIDs do not match to the projection unit 190 via the USB interface units 170 and 172. FIG. 7 is a diagram showing an example of the warning image 440 in the first embodiment. In this case, the projection unit 190 projects an image 403 including a warning image 440 that is a type of determination result image indicating that the SSIDs do not match (step S12). The warning image 440 shows, for example, a character string such as “Cannot connect to the network. Check the access point settings.”

  The wireless communication unit 120 can connect to the access point 300 by transmitting security information such as a user name and a password to the access point 300 after transmitting the third request packet. Information can be transmitted to and received from the PC 200 via 300.

  When LAN (wired LAN or wireless LAN) is selected as an image input source and no image signal is input, the projection unit 190 projects a state notification image. FIG. 8 is a diagram illustrating an example of the state notification image 450 in the first embodiment. The status notification image 450 is an image indicating a connection mode (manual mode, simple mode), a LAN type (wired LAN, wireless LAN), a projector name, an SSID, a keyword, and the like. The user can check the current network settings and the like from the status notification image 450.

  As described above, according to the present embodiment, when the projector 100 does not have the access point list display function based on the scan list data 142 by transmitting the request information specifying the BSSID and receiving the response information. Even so, it is possible to obtain sufficient information regarding the access point for which the SSID non-disclosure setting is performed, and to reflect the information in the scan list data 142. Further, by connecting to the access point using the scan list data 142, the projector 100 can connect more reliably when connecting to the access point for which the SSID non-public setting is performed. Accordingly, the projector 100 can reduce the occurrence of connection errors even when connecting to the access point 300 for which the SSID is set to be private.

  Further, according to the present embodiment, the projector 100 can also determine whether the SSID of the access point matches the input SSID for the access point for which the SSID non-disclosure setting is performed. In addition, according to the present embodiment, the projector 100 also connects an access point for which the SSID non-disclosure setting has been performed to the access point when the SSID of the access point matches the input SSID. It is possible to connect more reliably while ensuring security. Further, according to the present embodiment, the projector 100 projects the warning image 440 so that the user can determine whether there is an access point that matches the SSID designated by the user.

(Other examples)
In addition, application of this invention is not limited to the Example mentioned above, A deformation | transformation is possible. For example, the warning image is not limited to the warning image 440, and may be an image indicating not only the error content but also an error number. The projection unit 190 may project a warning image not only when the SSIDs do not match, but also when the authentication formats do not match, when authentication fails, when the access point 300 is disconnected, or the like. Further, the determination result image indicating the presence / absence of an access point having an SSID that matches the SSID input to the input unit is not limited to the warning image 440, and is connected to an access point having an SSID that matches the input SSID. It may be an image showing success.

  Further, the electronic device to which the wireless communication apparatus 110 can be connected is not limited to the projector 100. For example, the wireless communication device 110 may be connected to a printer, a multifunction device, or the like. The wireless communication device 110 is not limited to a detachable device. For example, the projector 100 may incorporate the function of the wireless communication device 110. Further, the output unit and the input unit described above are not limited to the USB interface, and may be other input / output units such as IEEE1394, for example.

  The computer included in the projector 100 may function as the control unit 150 or the like by reading a program stored in the information storage medium. As such an information storage medium, for example, a CD-ROM, DVD-ROM, ROM, RAM, HDD, or the like can be applied.

  The projector 100 is not limited to a liquid crystal projector (transmission type, reflection type such as LCOS), and may be a projector using a digital micromirror device, for example. Further, the projection unit 190 may include a solid light source such as an LED instead of the lamp. Further, the function of the projector 100 may be distributed to a plurality of devices (for example, a PC and a projector).

  10 screens, 20 images, 100 projectors, 110 wireless communication devices, 120 wireless communication units, 130 update units, 140 storage units, 142 scan list data, 144 network setting data, 150 control units, 160 determination units, 170 USB interface units ( Input unit), 172 USB interface unit (output unit), 180 reception unit, 190 projection unit, 200 PC, 300 access point, 400-403 image, 410 wireless LAN setting image (designated image), 420 security setting image, 430 setting Completion image, 440 warning image (judgment result image), 450 status notification image

Claims (8)

A wireless communication unit that receives first response information about an access point by broadcasting first request information that does not designate network identification information;
An update unit that updates scan list data related to the access point based on the first response information;
Based on the scan list data, a determination unit that determines whether there is an access point whose SSID is private,
When the determination unit determines that there is an access point whose SSID is not disclosed, second request information specifying a BSSID included in the scan list data corresponding to the access point is transmitted to the wireless communication A control unit that causes the unit to broadcast transmission,
Including
The wireless communication unit receives the second response information including the SSID related to the access point where the SSID is private by broadcasting the second request information,
The update unit updates the scan list data based on the second response information.
Wireless communication device. The wireless communication device according to claim 1,
Including an input unit for inputting the SSID;
The determination unit determines whether there is an access point having an SSID that matches the SSID input to the input unit based on the scan list data.
Wireless communication device. The wireless communication device according to claim 2,
When the determination unit determines that there is an access point having an SSID that matches the SSID input to the input unit by the determination unit, the control unit controls the wireless communication unit to connect to the access point.
Wireless communication device.   A projector including the wireless communication apparatus according to claim 1. The projector according to claim 4, which is dependent on any one of claims 2 and 3,
A projection unit for projecting a designated image for accepting designation of the SSID;
A reception unit that receives the designation of the SSID;
An output unit that outputs the SSID received by the receiving unit to the input unit;
Including projector. The projector according to claim 4, which is dependent on any one of claims 2 and 3,
A projector including a projection unit that projects a determination result image indicating the presence or absence of an access point having an SSID that matches the SSID input to the input unit. The projector according to any one of claims 5 and 6,
The projection unit does not have a list display function of access points based on the scan list data;
projector. Wireless communication device
Broadcast first request information not specifying network identification information;
Receiving first response information about the access point;
Updating scan list data related to the access point based on the first response information;
Based on the scan list data, determine whether there is an access point whose SSID is private,
When there is an access point whose SSID is not disclosed, the second request information specifying the BSSID included in the scan list data corresponding to the access point is broadcasted,
Receiving second response information including an SSID relating to an access point whose SSID is private;
Updating the scan list data based on the second response information;
Wireless communication method.