JP2014216736A - Wireless LAN connection system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wireless LAN connection system to easily establish connection between an access point and a station.SOLUTION: When a projector 1 functioning as an access point is turned on, the projector 1 projects projector identification information 4 on a screen 3. A station 7 (smart phone) with a mounted camera takes a photo of the projector identification information 4, light 5 of a photoflash working as a trigger signal is generated at the time. When the projector 1 receives the light of the photoflash, it starts PBC (Push Button Configuration) operation in WPS (WiFi Protected Setup) of a wireless LAN communication standard. In addition, the station 7 photographs the projector identification information by the camera to confirm a WPS execution object and starts WPS.

Description

  The present invention relates to a wireless LAN connection system, and more particularly, to a WPS (WiFi Protected Setup) technique.

  Recently, a wireless LAN (Local Area Network) compliant with the IEEE 802.11 standard has become widespread. A wireless LAN network is composed of a wireless LAN base station (access point (AP)) and a wireless LAN terminal (station (STA)), and each station is connected to an access point in an infrastructure mode. In order for each station to connect to the access point, it is necessary to set connection information such as SSID (Service Set Identifier) and security settings necessary for connection on the station side.

  WPS has been standardized as a means for setting. WPS is a protocol for wireless LAN security settings, and is a standardized protocol for the purpose of safely distributing security settings to access points and stations.

  In WPS, there are two types of connection methods: PBC (Push Button Configuration) method and PIN (Personal Identification Number) method. In the PBC system, the WPS protocol starts operating by pressing the push buttons attached to the access point and the station, and the connection information setting is completed by exchanging information between the access point and the station. To do.

  That is, the access point and the station are provided with WPS push buttons, and the user manually connects the access point and the station push buttons to complete the connection information setting. For example, Patent Document 1 discloses a method for simply performing such WPS connection processing.

JP 2010-278536 A

  As described above, in order to establish a connection between an access point and a station using the WPS PBC method, it is necessary to provide a WPS push button for the access point and the station, and the user must manually push the push button for the access point and the station. there were. However, adding a dedicated button leads to a decrease in usability, and the operation of manually pressing the push button by the user is difficult and very troublesome depending on the location of the access point.

  The present disclosure has been made in view of the above, and it is an object of the present disclosure to provide a wireless LAN connection system for easily establishing a connection between an access point and a station without requiring a dedicated WPS push button and its operation. And

A wireless LAN connection system of the present disclosure includes an imaging unit, a station having a trigger generation unit that generates a trigger signal when the imaging unit is operated,
Character string generating means for generating an access point identifying character string, display means for displaying the access point identifying character string on a screen, and an access point having a sensor for receiving a trigger signal from the station,
When the sensor receives the trigger signal, the access point starts a PBC (Push Button Configuration) operation in a wireless LAN communication standard WPS (WiFi Protected Setup),
The station confirms that the access point is a WPS execution target from the access point identification character string photographed by the imaging means, and starts the PBC operation in WPS of the wireless LAN communication standard.

  According to the present disclosure, there is no need for a dedicated WPS push button and its operation, and it is possible to provide a wireless LAN connection system that can easily establish communication between an access point and a station.

Explanatory drawing of the wireless LAN connection system in Embodiment 1 of this indication. 4 is an explanatory diagram illustrating a configuration of a projector equipped with a wireless LAN access point function according to the first embodiment of the present disclosure. FIG. Explanatory drawing which shows the structure of the station in Embodiment 1 of this indication. 10 is a flowchart of projector connection processing according to the first embodiment of the present disclosure. 10 is a flowchart of station connection processing according to the first embodiment of the present disclosure. 10 is a flowchart of SSID generation processing according to Embodiment 1 of the present disclosure. Explanatory drawing which shows the MAC frame of the probe request of IEEE802.11. Explanatory drawing which shows the MAC frame of the probe response of IEEE802.11. Explanatory drawing of the SSID list | wrist of the station in Embodiment 1 of this indication.

  Embodiment 1 of the present invention will be described below with reference to the drawings.

(Embodiment 1)
FIG. 1 is an explanatory diagram of a wireless LAN connection system according to an embodiment of the present invention. The projector 1 functions as a wireless LAN access point and is equipped with an illuminance sensor, and projects projector identification information 4 ("111a" in FIG. 1) onto the screen 3 at a timing described later.

  The station 7 is a smartphone in the present embodiment, and is equipped with a wireless LAN function, a camera, and a flash device. When photographing is performed with the camera, flash light 5 emitted from the flash device is emitted. The station 7 transmits and receives radio waves 6 and is connected to the projector 1 in the infrastructure mode.

  The projector 1 is turned on and off by the operation unit 2. The station 7 is installed near the projector 1. Further, a conventional access point 8 is disposed in a room where the projector 1 is installed.

  FIG. 2 is a block diagram showing an electrical configuration of the projector 1.

  The projector 1 includes a main control unit 11 that controls the projector, a light source 12, a liquid crystal panel 13 that displays an image, and a projection lens 14 that enlarges and projects an image in which light from the light source 12 is modulated by the liquid crystal panel 13. . Also, an illuminance sensor 15 for detecting the flash light 5 from the station 7, a reception intensity measurement unit 16 for measuring the illuminance of the flash light acquired from the illuminance sensor 15, a network control unit 17 for controlling the network, A wireless LAN interface 18 and an antenna 19 are provided. The main control unit 11 includes a CPU, RAM, ROM, etc. (not shown).

  The network control unit 17 includes an information transmission unit 17a that transmits predetermined network identification information and projector identification information for identifying other projectors, and a network connection unit 17b that performs settings necessary for WPS connection. The network control unit 17 includes a CPU, RAM, and ROM (not shown).

  FIG. 3 is a block diagram showing an electrical configuration of the station 7. The station 7 mainly includes a CPU 71 as a control means, a RAM 72 as a main memory, a ROM 73, a display 74 as a display means, an input device 75 such as a keyboard and a mouse, a wireless LAN interface 76, an antenna 77, a camera 78, a dark A flash device 79 for photographing at a place, a speaker 80, and an infrared transmitter 81.

  Here, the ROM 73 is preinstalled with a program (referred to as a wireless manager (WM)) that is wireless setting software for connecting the projector 1 and the station 7 via a wireless LAN. This wireless setting software can be installed later.

  This program stores network identification information. When the station 7 is activated, this program is loaded into the RAM 72 and executed. When the projector identification information 4 projected by the projector 1 is photographed by the camera, the flash 79 is activated, the flash light 5 is emitted as a trigger signal, and the projector identification information 4 is extracted from the photographed image. Connection processing is executed.

  When a program for connecting to the projector 1 is executed and the projector 1 is connected, the image file is wirelessly transmitted to the projector 1 via the wireless LAN interface 76 as TCP / IP data.

  Next, connection processing between the projector 1 and the station 7 will be described. The projector 1 and the station 7 store MAC addresses.

  Here, the MAC address is as follows.

Projector 1: 12345611111a
Conventional access point 8: 12345644444d
Station 7: 123456123456
Further, the projector 1 stores network identification information. Here, the network identification information is “ABCD”.

  FIG. 4 is a flowchart showing processing until the projector 1 is connected to the station 7.

  When the power of the projector 1 is turned on by the operation unit 2, the main control unit 11 is activated in step S51, and the network control unit 17 is activated from the main control unit 11 in step S52.

  In step S53, the network control unit 17 loads the OS from the ROM to the RAM, and the OS is activated in step S54. In step S55, the OS loads the user program from the ROM to the RAM, and in step S56, the user program is executed by the OS.

  In step S57, the user program executed by the OS executes SSID generation processing.

  FIG. 6 is a flowchart of the SSID generation process.

  In step S31, identification information unique to the projector is generated. That is, projector identification information is generated based on information related to the projector. A code such as its own MAC address and serial number is used as related information. The generated identification information may be the same as the base code or may be a part of the base code.

  Alternatively, a random number may be generated with a base code as an input, and the value of the random number or a code of a part thereof may be used. Here, the lower four digits of the MAC address code are used as access point identification information (projector identification information). For example, the identification information of the projector 1 is “111a”.

  In step S32, the network identification information and the access point identification information are combined. In step S33, a parity code is added to generate an SSID code. For example, the parity of the projector 1 is “FE”, and at this time, the SSID of the projector 1 is as follows.

SSID of projector 1: ABCD111aFE
Although not shown in FIG. 4, after the SSID is generated, the projector 1 projects the identification information “111a” of the projector 1 on the screen 3.

  Thereafter, when flash photography is performed by the station 7 to be described later, in step S58, the illuminance of the flash light 5 acquired from the illuminance sensor 15 is measured by the reception intensity measurement unit 16, and it is determined whether or not it is equal to or greater than a specified value. judge. If it is greater than or equal to the specified value (in the case of “YES”), WPS is started in step S59.

  Next, in step S60, it is determined whether it is less than 2 minutes after starting WPS. If it is less than 2 minutes (in the case of “YES”), it is determined whether or not there is a WPS connection request from the station 7 in step S61.

  If there is a WPS connection request from the station 7 (in the case of “YES”), WPS connection processing is executed in step S62. When the process is completed, a WPS connection response is transmitted to the station 7 in step S63, and a connection with the station 7 is established in step S64. When the connection with the station 7 is established in step S64, WPS is stopped in step S65.

  Next, the operation until the station 7 is connected to the projector 1 will be described with reference to FIG.

  When the power of the station 7 is turned on, the OS is started in step S71. Next, when the program is executed in step S72, the program is loaded from the ROM 73 to the RAM 72, the wireless manager is activated, and the camera is activated in step S73.

  When the projector identification information 4 projected on the screen 3 is photographed with a flash in step S74, the projector identification information “111a” of the projector 1 is extracted in step S75.

  Next, in step S76, the search operation is started. That is, the radio wave 6 is emitted via the wireless LAN interface 76 and the antenna 77, and the search for the projector is started. Specifically, the wireless manager transmits a probe request frame (see FIG. 7) to all channels (for example, ch1 to ch11), and receives a probe response frame (see FIG. 8) as a response to scan. To create an SSID list (see FIG. 9).

  FIG. 7 shows a probe request frame transmitted from the station 7 in order to acquire access point information, and is a MAC frame format according to IEEE 802.11. The MAC frame is composed of a MAC header 111, a payload 112, and an FCS (Frame Check Sequence) 113.

  The MAC header 111 includes a destination address field 114, a transmission source address field 115, and a BSSID field 116. In the transmission source address field 115, the MAC address “123456123456” of the station 7 is entered in the transmission source, and “Null” is entered in the SSID field 117 of the payload 112.

  FIG. 8 shows a probe response frame transmitted by the projector 1 and the conventional access point 8 in response to the probe request frame of the station 7 and responding with its own information. In the case of the projector 1, the destination address field 114 is “123456123456”, the transmission source address field 115 is “12345611111a”, the SSID field 117 is “ABCD111a”, and the Device Password ID in the WPS field 118 is “4”.

  In the case of the conventional access point 8, a probe response in which the destination address field 114 is “123456123456”, the source address field 115 is “123456644444d”, the SSID field 117 is “123456789”, and the Device Password ID in the WPS field 118 is “0”. Send a frame.

  Here, Device Password ID indicates a WPS system and is as follows.

“0”: WPS pin code “4”: WPS button FIG. 9 is an explanatory diagram of the SSID list created by the station 7 in step S76. The MAC address and WPS Device Password ID information are extracted for each SSID, and are arranged in the order of the projector 1 and the conventional access point 8 from the top.

  Next, in step S77, it is determined whether or not all the SSID lists created in step S76 have been checked. If there is an SSID that is checked (in the case of “YES”), in step S78, it is determined whether or not the Device Password ID corresponding to the unchecked SSID is “4”.

  When the ID is “4” (in the case of “YES”), in step S79, it is determined whether or not the unchecked SSID includes the specified network identification information “ABCD”. If the prescribed network identification information “ABCD” is included (in the case of “YES”), it is determined in step S80 whether or not the projector identification information “111a” extracted from the photographed image is included in the unchecked SSID. judge.

  If projector identification information “111a” extracted from the captured image is included (in the case of “YES”), WPS is started in step S81. Next, when a WPS connection request is transmitted from the station 7 to the projector 1 in step S82, WPS connection processing is executed in step S83. When the processing is completed, a WPS connection response transmitted from the projector 1 to the station 7 is received in step S84, and a connection with the projector 1 is established in step S85.

  When the connection with the projector 1 is established in step S85, WPS is stopped in step S86.

As described above, in the projector device according to the present embodiment, it is possible to execute WPS connection between the projector and the station by using photographing with the camera of the station as a trigger. Therefore, without performing a button operation necessary for WPS connection, The projector and the station can be connected by WPS.
(Other embodiments)
In the first embodiment, a flash is used as a trigger signal for starting WPS for a projector of a smartphone terminal as a station, and an illuminance sensor is used to receive the trigger signal. However, a tablet terminal is used instead of a smartphone. May be.

  As another embodiment, the trigger signal from the smartphone or tablet terminal is a sound wave such as a shutter sound from a speaker provided in the imaging means of the smartphone or tablet terminal, and a microphone is provided as a detection device in the projector. can do.

  As another embodiment, infrared light may be used as a trigger signal from a smartphone or tablet terminal, and an infrared sensor may be provided as a detection device in the projector.

  The present invention is useful when a station equipped with a wireless LAN communicates with a projector that operates as an access point.

DESCRIPTION OF SYMBOLS 1 Projector 2 Operation part 3 Screen 4 Projector identification information 5 Flash light 6 Radio wave 7 Station 8 Conventional access point 11 Main control part 12 Light source 13 Liquid crystal panel 14 Projection lens 15 Illuminance sensor 16 Reception intensity measurement part 17 Network control part 18, 76 Wireless LAN interface 19, 77 Antenna 71 CPU
72 RAM
73 ROM
74 Display 75 Input device 78 Camera 79 Flash 80 Speaker 81 Infrared transmitter

Claims (7)

An imaging means; and a station having a trigger generation means for generating a trigger signal when the imaging means is operated;
Character string generating means for generating an access point identifying character string, display means for displaying the access point identifying character string on a screen, and an access point having a sensor for receiving a trigger signal from the station,
When the sensor receives the trigger signal, the access point starts a PBC (Push Button Configuration) operation in a wireless LAN communication standard WPS (WiFi Protected Setup),
The station confirms that the access point is a WPS execution target from an access point identification character string photographed by the imaging means, and starts a PBC operation in WPS of a wireless LAN communication standard. Connection system.   The wireless LAN connection system according to claim 1, wherein the access point is a projector.   The wireless LAN connection system according to claim 1, wherein the station is a smartphone terminal.   The wireless LAN connection system according to claim 1, wherein the station is a tablet terminal.   The wireless LAN connection system according to claim 1, wherein the trigger signal is a flash light of an imaging unit, and the sensor is an illuminance sensor.   The wireless LAN connection system according to claim 1, wherein the trigger signal is a shutter sound from an imaging unit, and the sensor is a microphone.   The wireless LAN connection system according to claim 3 or 4, wherein the trigger signal is an infrared ray, and the sensor is an infrared sensor.

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