JP5527531B2 - Wireless communication apparatus, projector, and wireless communication method - Google Patents

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, if the SSID private setting (SSID stealth, SSID non-notification) is performed at the access point, or if the communication status is not good, even if the request information is broadcast, no response is obtained from the access point, Information necessary for connection cannot be obtained from the access point. 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 an access point or the like for which SSID non-disclosure setting has been performed.

  In some aspects of the present invention, by solving the above-described problem, even when request information is broadcast and an appropriate response cannot be obtained from the access point, the connection to the access point is possible. A wireless communication device, a projector, and a wireless communication method are provided.

  A wireless communication device according to one aspect of the present invention is a wireless communication device included in an electronic device that does not have an access point list display function, and includes an input unit to which an SSID is input, and first request information. A wireless communication unit that receives first response information about the access point by broadcast transmission, an update unit that updates scan list data about the access point based on the first response information, and the scan list data , A determination unit that determines whether there is data having an SSID that matches the SSID input to the input unit, and no data having an SSID that matches the SSID input to the input unit by the determination unit A control unit that sets connection information based on the connection data, and The communication unit performs connection with the access point corresponding to the SSID by unicasting the second request information specifying the connection information and the SSID input to the input unit. And According to this, even if the wireless communication apparatus or the like does not receive an appropriate response from the access point even if the request information is broadcasted, it can connect to the access point.

  Further, the connection data may include data indicating a priority for each authentication method, and the control unit may set an authentication method according to the priority as a part of the connection information. According to this, a wireless communication apparatus or the like can connect to a desired access point more quickly by setting an authentication method according to priority.

  The connection data includes pre-shared key compatible data and pre-shared key non-compatible data, the input unit receives information indicating a specified authentication method, and the control unit The connection information may be set by referring to the data corresponding to the pre-shared key or the data not corresponding to the pre-shared key based on the designated authentication method. According to this, a wireless communication device or the like can connect to a desired access point more reliably by using data according to a designated authentication method.

  Further, the access point may be set so that the SSID is not disclosed. Since the wireless communication unit unicasts the second request information specifying the connection information and the SSID input to the input unit, the wireless communication device or the like is set to make the SSID private. Even an access point that is connected can obtain information necessary for connection, and thus can connect to the access point.

  According to another aspect of the invention, there is provided a projector that receives the wireless communication device, a projection unit that projects a designation image that accepts designation of the SSID, a reception unit that accepts designation of the SSID, and the reception unit. And an output unit that outputs the received SSID to the input unit. According to this, since the user of the projector can designate the SSID of the access point to be connected according to the instruction indicated by the designated image to be projected, it is highly convenient. Furthermore, since it is not necessary to provide a means for displaying a message prompting the SSID designation separately on the wireless communication apparatus side, the cost of the wireless communication apparatus can be reduced.

  According to another aspect of the present invention, there is provided a wireless communication method in which a wireless communication device included in an electronic device that does not have an access point list display function receives the SSID and broadcasts the first request information. The first response information related to the access point is received, and the scan list data related to the access point is updated based on the first response information. In the scan list data, the SSID that matches the input SSID is If there is no data having an SSID that matches the input SSID in the scan list data, connection information is set based on the connection data, and the connection information and Unicast the second request information specifying the input SSID It makes and performs a connection with the access point corresponding to the SSID. According to this method, the wireless communication apparatus can connect to the access point even when an appropriate response cannot be obtained from the access point even if the request information is broadcasted.

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 data for a connection in a 1st Example.

It is a figure which shows an example of a setting completion image.

  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 the present embodiment, the projector 100 sets connection information using connection data when data matching the desired SSID cannot be obtained even if the probe request packet specifying the SSID is broadcasted. Thus, it has a function of connecting to the access point 300 corresponding to the desired SSID. 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 apparatus 110 includes a wireless communication unit 120, a storage unit 140 that stores scan list data 142, network setting data 144, connection data 146, and the like, an update unit 130 that updates the scan list data 142, and the like. A control unit 150 that controls the wireless communication unit 120 and the like, a determination unit 160, and a USB interface unit 170 having a function as an input unit are configured. The scan list data 142 is data indicating information on the access point, the network setting data 144 is data indicating a communication method or the like in the projector 100, and the connection data 146 is for setting connection information. It is data.

  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, and 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 authentication 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, and the like according to the selected authentication method. In addition, the authentication method includes a pre-shared key-compatible authentication method in which PSK is added to the end of WPA-PSK (Pre Shared Key) and the like, and a pre-shared key incompatible with a pre-shared key in which PSK is not added to the end of WPA, etc. There is an authentication 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 first request packet corresponds to the first request information of the present invention. 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 the SSID and BSSID (Basic Service Set Identifier) of the access point in the payload of the first response packet for transmission. 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.

  Based on the scan list data 142 and the network setting data 144, the determination unit 160 determines whether the scan list data 142 has access point data having an SSID that matches the input SSID (step S6). When the SSIDs match, the control unit 150 transmits a second request packet specifying the SSID and the BSSID corresponding to the SSID to the access point 300 having the strongest signal strength based on the scan list data 142. 120 makes the unicast transmission (step S7). The second request packet corresponds to the second request information of the present invention. If connection to the access point 300 having the highest signal strength is not possible, the wireless communication unit 120 transmits the request packet to the access point 300 having the second highest signal strength. The same applies to the third and subsequent times.

  On the other hand, when the SSIDs do not match, for example, when there is data whose SSID value is NULL in the scan list data 142, the control unit 150 determines the authentication method and the priority based on the data and the connection data 146. Accordingly, the second request packet designating the SSID is unicast transmitted to the wireless communication unit 120 (step S8). Note that data in which the SSID value in the scan list data 142 is NULL is data related to an access point for which a private SSID is set.

  FIG. 7 is a diagram illustrating an example of the connection data 146a and 146b in the first embodiment. For example, when the authentication method corresponding to the pre-shared key is selected by the user, the control unit 150 selects the connection data 146a corresponding to the pre-shared key, and when the authentication method not corresponding to the pre-shared key is selected by the user. The connection data 146b that does not support the pre-shared key is selected. Further, the control unit 150 sets the connection information from the data having the highest priority (priority = 1). For example, when the authentication method corresponding to the pre-shared key is selected by the user, the control unit 150 determines that the authentication method is “WPA2-PSK”, the pair key for the key exchange method is “AES”, and the group key for the key exchange method is “AES”. The connection information is set so as to indicate "." In addition to AES, WEP or TKIP (Temporal Key Integrity Protocol) can be selected as the above-described pair key or group key. The example of the connection data 146 shown in FIG. 7 is an example, and the contents and priority set in the connection information are not limited to the example shown in FIG.

  The wireless communication unit 120 performs unicast transmission in step S7 or step S8, and the determination unit 160 determines whether or not the connection with the target access point has succeeded by the unicast transmission (step S9). If the connection fails, the projector 100 executes the processes after step S3 again. Note that the first and subsequent first request packets may be designated with an SSID. The second request packet in the second and subsequent steps S8 is set with the connection information with the second and subsequent priorities.

  As described above, according to the present embodiment, the projector 100 can connect to the scan list data 142 based on the connection data 146 even when there is no data having an SSID that matches the input SSID. Information can be set, and the second request information specifying the connection information and the input SSID can be unicasted. Accordingly, the projector 100 can connect to the access point 300 even when an appropriate response cannot be obtained from the access point 300 even if the request information is broadcasted.

  Further, according to the present embodiment, the projector 100 can connect to the desired access point 300 more quickly by setting an authentication method according to the priority. Further, according to the present embodiment, the projector 100 can connect to the desired access point 300 more reliably by using data according to the designated authentication method. Furthermore, according to the present embodiment, the projector 100 can obtain information necessary for connection even if the access point 300 is set to a non-public SSID. Is possible. 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.

(Other examples)
In addition, application of this invention is not limited to the Example mentioned above, A deformation | transformation is possible. For example, the projection unit 190 may project 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. In addition, when the connection with the access point 300 fails, the projection unit 190 may project an error content or a warning image indicating an error number.

  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, 146 connection data, 150 control units, 160 determination units, 170 USB interface unit (input unit), 172 USB interface unit (output unit), 180 reception unit, 190 projection unit, 200 PC, 300 access point, 400-402 image, 410 wireless LAN setting image (designated image), 420 security Setting image, 430 Setting completion image

Claims (6)

A wireless communication device included in an electronic device having no access point list display function,
An input unit for inputting the SSID;
A wireless communication unit that receives first response information about the access point by broadcasting the first request information;
An update unit that updates scan list data related to the access point based on the first response information;
A determination unit that determines whether there is data having an SSID that matches the SSID input to the input unit in the scan list data;
When the determination unit determines that there is no data having an SSID that matches the SSID input to the input unit, a control unit that sets connection information based on the connection data;
Including
The wireless communication unit designates the SSID input to the input unit when the determination unit determines that the scan list data includes data having an SSID that matches the SSID input to the input unit. By performing unicast transmission of the second request information, the connection with the access point corresponding to the SSID is performed, and the SSID that matches the SSID input to the input unit is added to the scan list data by the determination unit. If it is determined that there is no data, the access point corresponding to the SSID is transmitted by unicasting the second request information specifying the connection information and the SSID input to the input unit. A wireless communication device that connects to the device. The wireless communication device according to claim 1,
The connection data includes data indicating a priority for each authentication method,
The control unit sets an authentication method according to the priority as a part of the connection information.
Wireless communication device. The wireless communication device according to claim 1,
The connection data includes pre-shared key compatible data and pre-shared key non-compatible data,
The input unit receives information indicating a designated authentication method,
The control unit sets the connection information by referring to the data corresponding to the pre-shared key or the data not corresponding to the pre-shared key based on the specified authentication method.
Wireless communication device. In the radio | wireless communication apparatus in any one of Claims 1-3,
The access point is a setting in which the SSID is not disclosed.
Wireless communication device. A wireless communication device according to any one of claims 1 to 4,
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. A wireless communication device included in an electronic device having no access point list display function
SSID is entered,
Receiving first response information about the access point by broadcasting the first request information;
Updating scan list data related to the access point based on the first response information;
In the scan list data, it is determined whether there is data having an SSID that matches the input SSID,
When it is determined that there is data having an SSID that matches the input SSID in the scan list data, the second request information specifying the input SSID is unicasted to transmit the SSID. Connect to an access point that supports
When it is determined that there is no data having an SSID that matches the input SSID in the scan list data , connection information is set based on the connection data, and the connection information and the input By unicasting the second request information specifying the SSID, connection with the access point corresponding to the SSID is performed.
Wireless communication method.