JP4741973B2 - Wireless LAN communication system and distance determination method between wireless LAN terminals - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a communication system easily determining wireless LAN terminals to be connected. <P>SOLUTION: The wireless LAN communication system has wireless LAN terminals 100 to 400, which each acquire network information including radio wave intensities, SSIDs, and MAC addresses by peripheral wireless LAN terminals through a site survey. The wireless LAN terminal 100 gathers a network information group acquired by the wireless LAN terminals 200 to 400 from the wireless LAN terminals, determines correspondence between the gathered network information group and the network information group acquired by itself based upon network identifiers and address information included in the respective pieces of network information, and calculates similarities of radio wave intensities for each the wireless LAN terminal with the corresponding network information. <P>COPYRIGHT: (C)2008,JPO&amp;INPIT

Description

  The present invention relates to a system that performs communication using a wireless local area network (LAN), and more particularly, to a wireless LAN communication system that performs wireless communication directly between a plurality of wireless LAN terminals.

  A wireless LAN interface that performs wireless communication in accordance with the wireless LAN standard (IEEE 802.11) is called a communication mode in which wireless communication is performed through an access point, and ad hoc in which wireless communication is performed without using an access point. There is a communication form (Patent Document 1).

In a wireless LAN communication system that employs the above communication mode, a user performs a site survey in order to connect a wireless LAN terminal owned by the user to a peripheral wireless LAN terminal. The site survey displays a list of information (such as radio wave intensity, SSID (Service Set Identifier) and MAC (Media Access Control) address information) of neighboring wireless LAN terminals on the wireless LAN terminal. The user determines a terminal that should perform wireless communication based on the displayed list of wireless LAN terminal information.
JP 2005-252495 A

  However, the above-described conventional wireless LAN communication system has the following problems.

  In the site survey, information on all wireless LAN terminals located in a range where radio waves reach is displayed, so information on unrelated wireless LAN terminals may be displayed together with the list of wireless LAN terminals. For example, when communication is performed between wireless LAN terminals arranged in the same department, when a site survey is performed, an unrelated wireless LAN arranged in another department may be displayed together. The information of the wireless LAN terminal displayed by the site survey is information such as radio wave intensity, SSID, and MAC address, and the user can determine which terminal is adjacent to the wireless LAN terminal (wireless LAN to be connected) by using only the display information. It is difficult to determine whether it is a terminal. If the wireless LAN terminal that performed the site survey can acquire information on whether the wireless LAN terminal detected by the site survey is adjacent to its own terminal, which terminal is placed in the same department based on that information. It is possible to determine whether the wireless LAN terminal has been connected. However, in the above-described wireless LAN communication system, information on the wireless LAN terminal detected by the site survey is simply displayed, so it is possible to determine which terminal is the adjacent wireless LAN terminal. There wasn't.

  Note that it is conceivable that a radio LAN terminal having a low radio field intensity is determined as an adjacent terminal by regarding the radio field intensity displayed by the site survey as a distance. However, since the radio wave output level of the wireless LAN terminal varies depending on the model (type of wireless LAN interface), a terminal with a high output level located far away may be erroneously determined as an adjacent terminal.

  An object of the present invention is to provide a wireless LAN communication system capable of solving the above problems and determining adjacent wireless LAN terminals.

In order to achieve the above object, the wireless LAN communication system of the present invention provides:
A wireless LAN communication system comprising: a first wireless LAN terminal; and a plurality of second wireless LAN terminals that perform wireless communication between the first wireless LAN terminal,
Each of the first and second wireless LAN terminals periodically transmits a wireless signal including a network identifier for identifying a network for performing the wireless communication and address information of the terminal in the network,
Each of the second wireless LAN terminals is
The wireless signal is received from each of the first wireless LAN terminal and the other second wireless LAN terminal, and included in the received wireless signal and the radio field strength of the received wireless signal for each wireless LAN terminal. A first site survey processing unit for obtaining first network information including a network identifier and address information;
In response to a transmission request for network information, the first network information group for each wireless LAN terminal acquired by the first site survey processing unit, together with terminal identification information for identifying its own terminal, A network information transmitter for transmitting to the transmission request source,
The first wireless LAN terminal is
The wireless signal is received from each of the second wireless LAN terminals, and each wireless LAN terminal includes a radio field intensity of the received wireless signal and a network identifier and address information included in the received wireless signal. A second site survey processing unit for acquiring network information of 2;
A network information collection unit that transmits a transmission request for the network information to each of the second wireless LAN terminals, and collects the first network information group and terminal identification information for each wireless LAN terminal;
The correspondence between the second network information group for each wireless LAN terminal acquired by the second site survey processing unit and the first network information group for each wireless LAN terminal collected by the network information collection unit, Judgment is made based on the network identifier and address information included in each network information, and for each wireless LAN terminal, a radio field strength similarity is calculated by relatively comparing the radio field intensity included in the corresponding network information. And a network similarity calculation unit.

  According to the above configuration, each of the first and second wireless LAN terminals periodically obtains network information (SSID, MAC address, radio wave intensity) related to the wireless LAN terminals existing in the vicinity by the site survey. . The radio wave intensity of the network information acquired by the first wireless LAN terminal is similar to the radio wave intensity of the network information acquired by the second wireless LAN terminal adjacent to the first wireless LAN terminal. Based on the knowledge, it can be determined that the terminals having high radio field strength similarity are closer to each other than the terminals having low similarity. In the present invention, since the similarity of the radio field intensity between the first wireless LAN terminal and each second wireless LAN terminal is calculated, based on the calculated similarity, the first wireless LAN terminal It is possible to determine the distance between each second wireless LAN terminal.

  Further, since the distance between the terminals is determined based on the similarity of the radio wave intensity, when the output level of the radio wave at each second wireless LAN terminal is different, a terminal with a high output level located far away is selected. It is not mistaken for an adjacent terminal. The reason will be briefly described below.

  For example, when performing wireless communication using the same SSID between terminal A (first wireless LAN terminal) and two terminals B1 and B2 (second wireless LAN terminal) having different radio wave output levels, The terminal B1 obtains the first network information group (which includes the network information N1 including the radio field intensity a of the terminal A and the network information N2 including the radio field intensity b2 of the terminal B2) acquired by the site survey from the terminal A. The terminal B2 includes the first network information group acquired by the site survey (the network information N3 including the radio field intensity a of the terminal A and the network information N4 including the radio field intensity b1 of the terminal B1. ) To terminal A. The terminal A has the second network information group acquired by the site survey in its own terminal (this is composed of network information N5 including the radio wave intensity b1 of the terminal B1 and network information N6 including the radio wave intensity b2 of the terminal B2). And the similarity of the radio wave intensity of the corresponding network information with the first network information group collected from each of the terminals B1 and B2.

  Specifically, when calculating the similarity of the radio field intensity between the first network information group and the second network information group collected from the terminal B1, the network information N1, N5 corresponds, and the network information N2, Since N6 corresponds, for the network information N1 and N5, the similarity between “the radio wave intensity a of terminal A” acquired by the terminal B1 and “the radio wave intensity b1 of terminal B1” acquired by the terminal A is calculated, and the network information N2 , N6, the similarity between “the radio wave intensity b2 of terminal B2” acquired by the terminal B1 and “the radio wave intensity b2 of terminal B2” acquired by the terminal A is calculated. On the other hand, when calculating the similarity of the radio wave intensity between the first network information group and the second network information group collected from the terminal B1, the network information N3 and N6 correspond, and the network information N4 and N5 correspond. Therefore, for the network information N3 and N6, the similarity between “the radio field intensity a of terminal A” acquired by the terminal B2 and “the radio field intensity b2 of terminal B2” acquired by the terminal A is calculated. The similarity between “the radio wave intensity b1 of terminal B1” acquired by the terminal B2 and “the radio wave intensity b1 of terminal B1” acquired by the terminal A is calculated.

  In the calculation of the similarity of the radio wave intensity, the similarity is a value obtained by relatively comparing the radio wave intensity. For example, when calculating the similarity of the radio wave intensity between the first network information group and the second network information group collected from the terminal B1, the values of the radio wave intensity a and b2 of the first network information group are Normalize based on the maximum value of these values, normalize the values of the radio wave strengths b1 and b2 of the second network information group based on the maximum value of these values, and corresponding radio wave strengths based on these normalized values Compare the values of. By relatively comparing the radio field strengths in this way, it is possible to determine the distance between the terminal A and each of the terminals B1 and B2, regardless of the radio wave output level at the terminals B1 and B2.

  According to the present invention, even a wireless LAN terminal having a different radio wave output level or reception level can determine the distance between the terminals based on the similarity of the radio wave intensity. Therefore, it is possible to distinguish adjacent terminals that could not be performed in the conventional wireless LAN communication system.

  Next, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows a schematic configuration of a wireless LAN communication system according to an embodiment of the present invention. Referring to FIG. 1, the wireless LAN communication system includes a wireless LAN terminal 100 and wireless LAN terminals 200 to 400 that are connected to the wireless LAN terminal 100 by wireless communication. In the configuration example shown in FIG. 1, the number of wireless LAN terminals connected to the wireless LAN terminal 100 is three, but this is an example, and the number of wireless LAN terminals is not particularly limited. .

  The wireless LAN terminal 100 is a wireless LAN device having a wireless communication function, such as a notebook personal computer or a network projector. The wireless LAN terminals 200 to 400 are wireless LAN devices having a wireless communication function, and are, for example, notebook personal computers. The wireless LAN terminals 200 to 400 all have the same configuration. Here, the configuration of the wireless LAN terminals 100 and 200 will be specifically described.

  The wireless LAN terminal 100 includes a wireless LAN communication unit 120 including a wireless LAN interface that performs wireless communication in accordance with the wireless LAN standard (IEEE 802.11), and a mouse and a keyboard for inputting information and operating the terminal. An input unit 130, a display device 140 including a display device such as an LCD for displaying information, a storage unit 150 for storing programs and data necessary for operating the terminal, The CPU 110 executes a program stored in the unit 150, receives an input from the input unit 130, and controls the operation of each unit.

  Similarly to the wireless LAN terminal 100, the wireless LAN terminal 200 also includes a CPU 210, a basic configuration, a wireless LAN communication unit 220, an input unit 230, a display unit 240, and a storage unit 250, but some processing functions are wireless LAN terminals. Different from 100.

  FIG. 2 shows functional units that characterize the wireless LAN terminal 100, and FIG. 3 shows functional units that characterize the wireless LAN terminal 200.

  Referring to FIG. 2, the wireless LAN terminal 100 includes a site survey processing unit 111, a network information collection unit 112, and a network similarity as functional units provided by the CPU 110 executing a program stored in the storage unit 150. A degree calculation unit 113 is included.

  When the site survey processing unit 111 receives a site survey execution instruction from the input unit 130, the site survey processing unit 111 executes the site survey through the wireless LAN communication unit 120. The site survey is a function for acquiring periodic information output from each of the wireless LAN terminals 200 to 400 and acquiring wireless information and radio wave intensity. The wireless information includes SSID (Service Set Identifier) which is a network identifier necessary for wireless communication and MAC (Media Access Control) address information. The SSID is set by the user at the time of setting the network connection when performing wireless communication in each of the wireless LAN terminals 100 to 400. The MAC address is an address for identifying a wireless LAN terminal on the wireless LAN network, and is unique to each wireless LAN terminal. The site survey processing unit 111 stores the wireless LAN network information including the wireless information and the radio wave intensity acquired by the site survey in the storage unit 150 for each wireless LAN network specified by the SSID. When storing the radio wave intensity in the storage unit 150, the site survey processing unit 111 normalizes the acquired radio wave intensity of each wireless LAN network. In normalization, the acquired radio field intensity is converted into a proportionally distributed value so that the highest radio field intensity is “100”. The converted value is stored in association with the corresponding SSID for each wireless LAN network.

  When the network information collection unit 112 receives an input instruction from the input unit 130 to collect wireless LAN network information acquired by an external wireless LAN terminal, the wireless LAN communication unit 120 transmits each wireless LAN by broadcast communication. A request signal (wireless LAN network information collection command) for transmitting network information is transmitted to terminals 200-400. Further, the network information collecting unit 112 receives the wireless LAN network information transmitted by each of the wireless LAN terminals 200 to 400 that has received the request signal through the wireless LAN communication unit 120, and receives the received wireless LAN network for each wireless LAN terminal. Information is stored in the storage unit 150.

  The network similarity calculation unit 113 calculates the similarity of the radio field intensity between the wireless LAN network information group acquired by the site survey processing unit 111 and the wireless LAN network information group received from each of the wireless LAN terminals 200 to 400. Specifically, for each wireless LAN terminal, the network similarity calculation unit 113 corresponds to each of the wireless LAN network information acquired by the site survey processing unit 111 in the wireless LAN network information group received from the wireless LAN terminal. The similarity of the radio wave intensity with the wireless LAN network information to be calculated is calculated. The wireless LAN network information is supported by the SSID and MAC address included in the wireless LAN network information received from the wireless LAN terminal, and the SSID and local terminal included in the wireless LAN network information acquired by the site survey processing unit 111. Judgment is made based on whether or not the MAC address matches. Wireless LAN network information in which both the SSID and MAC address match can be determined as network information in the same wireless LAN network.

  Referring to FIG. 3, the wireless LAN terminal 200 includes a site survey processing unit 211 and a network information transmission processing unit 212 as functional units provided by the CPU 210 executing a program stored in the storage unit 250.

  The site survey processing unit 211 has the same function as the site survey processing unit 111 described above, and when receiving a site survey execution instruction from the input unit 230, executes the site survey through the wireless LAN communication unit 220, The acquired wireless information and wireless LAN network information including the radio wave intensity are stored in the storage unit 250 for each wireless LAN network.

  In response to the request signal (wireless LAN network information collection command) from the network information collection unit 112, the network information transmission processing unit 212 sends the wireless LAN network information stored in the storage unit 250 to the requesting wireless LAN terminal 100. Send. The request signal includes information on the MAC address of the requesting wireless LAN terminal 100, and the network information transmission processing unit 212 may determine the requesting wireless LAN terminal based on the MAC address. it can. The network information transmission processing unit 212 also transmits identification information (MAC address, terminal name, etc.) for identifying the own terminal when transmitting the wireless LAN network information stored in the storage unit 250 to the wireless LAN terminal 100. Send together. The wireless LAN terminal 100 can determine from which terminal the received wireless LAN network information is transmitted based on the identification information transmitted together.

  Next, the operation of the wireless LAN communication system of this embodiment will be specifically described.

  First, a wireless LAN terminal name registration process performed in each of the wireless LAN terminals 100 to 400 will be described. FIG. 4 shows a procedure of the wireless LAN terminal name registration process. Hereinafter, a wireless LAN terminal name registration process performed in the wireless LAN terminal 100 will be described with reference to FIGS. 1, 2, and 4.

  When a user of the wireless LAN terminal 100 performs an input operation for registering a wireless LAN terminal name using the input unit 130, the CPU 110 executes a wireless LAN terminal name registration program stored in the storage unit 150. To do. The CPU 110 that has executed the wireless LAN terminal name registration program reads registration screen information for registering the wireless LAN terminal name from the storage unit 150 and displays it on the display unit 130. The user inputs the wireless LAN terminal name on the displayed registration screen (step A1). When the information (wireless LAN terminal name) input on the registration screen is supplied from the input unit 130 to the CPU 110, the CPU 110 registers the supplied wireless LAN terminal name in the storage unit 150 (step A2).

  In the wireless LAN terminals 200 to 400, the same processing as the registration processing is performed.

  Next, site survey processing performed in each of the wireless LAN terminals 100 to 400 will be described. FIG. 5 shows a procedure for site survey processing. Hereinafter, a site survey process performed in the wireless LAN terminal 100 will be described with reference to FIGS. 1, 2, and 5.

  When the user of the wireless LAN terminal 100 inputs using the input unit 130 to execute the site survey, the site survey processing unit 111 executes the site survey through the wireless LAN communication unit 120 and the surrounding wireless communication is performed. Information on the LAN network group is collected (step B1). Next, the site survey processing unit 111 normalizes (relates) the radio wave intensity in each wireless LAN network acquired by the site survey (step B2). Then, the site survey processing unit 111 stores the wireless LAN network information and the radio wave intensity (normalized) regarding each wireless LAN network acquired by the site survey in the storage unit 150 for each wireless LAN network (step B3). The latest wireless LAN network information and radio wave intensity are stored in the storage unit 150 by periodically repeating the processes in steps B1 to B3.

  Also in the wireless LAN terminals 200 to 400, the same process as the site survey process is performed, and the latest wireless LAN network information and radio wave intensity are stored in the storage unit 250 of the own terminal.

  Next, an adjacency calculation process performed by the wireless LAN terminal 100 in wireless communication with the wireless LAN terminals 200 to 400 will be described. FIG. 6 shows a procedure for calculating the degree of adjacency. The adjacency calculation processing will be specifically described below with reference to FIGS. 1, 2, 3, and 6.

  When the user of the wireless LAN terminal 100 inputs using the input unit 130 to display a list of surrounding wireless LAN terminals (step C1), the network information collecting unit 112 passes through the wireless LAN communication unit 120. Then, a wireless LAN network information collection command is transmitted to surrounding wireless LAN terminals by broadcast communication (step C2).

  In each of the wireless LAN terminals 200 to 400, when the wireless LAN network information collection command is received from the wireless LAN terminal 100 (step C3), the network information transmission processing unit 212 passes through the wireless LAN communication unit 250 and the storage unit 250 in its own terminal. Is transmitted to the requesting wireless LAN terminal 100 (step C4).

  In the wireless LAN terminal 100, the network information collection unit 112 stores the wireless LAN network information group, the wireless LAN terminal name, and the MAC address received from each of the wireless LAN terminals 200 to 400 in the storage unit 150 for each wireless LAN terminal. (Step C5). Next, the network similarity calculating unit 113 calculates the corresponding network similarity between the wireless LAN network information group acquired by the site survey processing unit 111 and the wireless LAN network information group received from each of the wireless LAN terminals 200 to 400. The calculated similarity is stored in the storage unit 150 (step C6). Then, the network similarity calculation unit 113 sorts the information of the wireless LAN terminals 200 to 400 in descending order of similarity (step C7), and displays the information of the wireless LAN terminals 200 to 400 on the display unit 140 in that order. (Step C8).

  FIG. 7 shows an example of an information display screen of each of the wireless LAN terminals 200 to 400 displayed on the display unit 140. This display screen includes a wireless LAN terminal list display unit 141 that displays information on each of the wireless LAN terminals 200 to 400 in order of similarity, and a wireless LAN terminal connection button 142. The wireless LAN terminal list display unit 141 displays a distance between the wireless LAN terminal name display field in which the wireless LAN terminal names are displayed in descending order of similarity and the distance between the wireless LAN terminal on which the terminal name is displayed as a bar graph. It consists of a column. In the wireless LAN terminal 100, the user selects and designates a wireless LAN terminal name to be connected from a list of wireless LAN terminal names displayed in the wireless LAN terminal name display field, and selects and inputs the wireless LAN terminal connection button 142. As a result, the connection process to the selected and specified wireless LAN terminal is automatically started.

  FIG. 8 shows a procedure of similarity calculation processing performed in the network similarity calculation unit 113.

  Referring to FIG. 8, first, one wireless LAN network is selected from the wireless LAN networks found in the site survey by the site survey processing unit 111 and acquired by the site survey processing unit 111 stored in the storage unit 150. The wireless LAN network information (second wireless LAN network information) related to the selected wireless LAN network is extracted from the wireless LAN network information group, and the wireless LAN network information group received from the wireless LAN terminal 200 selects the wireless LAN network information. The wireless LAN network information (first wireless LAN network information) related to the wireless LAN network related to the wireless LAN network thus searched is searched (step D1). Whether or not they are the same wireless LAN network is determined based on whether both the SSID and the MAC address included in the wireless LAN network information are the same.

  When the first wireless LAN network information exists in the wireless LAN network information group received from the wireless LAN terminal 200, the radio wave intensity included in the first wireless LAN network information and the second wireless LAN network The difference (absolute value) from the radio wave intensity included in the information is calculated (step D2).

  The processes in steps D1 and D2 are repeated for the remaining wireless LAN networks found in the site survey by the site survey processing unit 111. Then, the total of the difference (absolute value) of the radio field intensity regarding each obtained wireless LAN network is obtained (step D3). The sum of the difference (absolute value) of the radio field intensity (similarity of radio field intensity) is the peripheral network similarity regarding the wireless LAN terminal 200.

  The processes in steps D1 to D3 are also performed on the remaining wireless LAN terminals 300 and 400. Thus, the peripheral network similarity of each of the wireless LAN terminals 200 to 400 is obtained.

  According to the wireless LAN communication system of the present embodiment described above, each of the wireless LAN terminals 100 to 400 periodically performs network information (SSID, MAC address, radio wave) related to wireless LAN terminals existing around by site survey. Strength). Since the radio field intensity of the network information acquired by the wireless LAN terminal 100 is similar to the radio field intensity of the network information acquired by the wireless LAN terminal adjacent to the wireless LAN terminal 100, the similarity of the radio field intensity is It can be determined that the high terminals are closer to each other than the terminals having low similarity. Therefore, the distance between the wireless LAN terminal 100 and the wireless LAN terminals 200 to 400 can be determined based on the similarity of the radio field intensity, and the wireless LAN terminals adjacent to the wireless LAN terminal 100 can be distinguished.

  In addition, since the distance between the terminals is determined based on the similarity of the radio field intensity, when the radio wave output levels of the wireless LAN terminals 200 to 400 are different, a terminal with a high output level located far away is selected. It is not mistaken for an adjacent terminal. The reason will be briefly described below.

  For example, when wireless communication using the same SSID is performed between the terminal A (wireless LAN terminal 100) and two terminals B1 and B2 (wireless LAN terminals 200 and 300) having different radio wave output levels, the terminal B1 Transmits to the terminal A the first network information group acquired from the site survey (which consists of the network information N1 including the radio field intensity a of the terminal A and the network information N2 including the radio field intensity b2 of the terminal B2). Then, the terminal B2 obtains the first network information group acquired by the site survey (this is composed of the network information N3 including the radio wave intensity a of the terminal A and the network information N4 including the radio wave intensity b1 of the terminal B1). Transmit to terminal A. The terminal A has the second network information group acquired by the site survey in its own terminal (this is composed of network information N5 including the radio wave intensity b1 of the terminal B1 and network information N6 including the radio wave intensity b2 of the terminal B2). And the similarity of the radio wave intensity of the corresponding network information with the first network information group collected from each of the terminals B1 and B2.

  Specifically, when calculating the similarity of the radio field intensity between the first network information group and the second network information group collected from the terminal B1, the network information N1, N5 corresponds, and the network information N2, Since N6 corresponds, for the network information N1 and N3, the similarity between “the radio wave intensity a of terminal A” acquired by the terminal B1 and “the radio wave intensity b1 of terminal B1” acquired by the terminal A is calculated, and the network information N2 , N6, the similarity between “the radio wave intensity b2 of terminal B2” acquired by the terminal B1 and “the radio wave intensity b2 of terminal B2” acquired by the terminal A is calculated. On the other hand, when calculating the similarity of the radio wave intensity between the first network information group and the second network information group collected from the terminal B1, the network information N3 and N6 correspond, and the network information N4 and N5 correspond. Therefore, for the network information N3 and N6, the similarity between “the radio field intensity a of terminal A” acquired by the terminal B2 and “the radio field intensity b2 of terminal B2” acquired by the terminal A is calculated. The similarity between “the radio wave intensity b1 of terminal B1” acquired by the terminal B2 and “the radio wave intensity b1 of terminal B1” acquired by the terminal A is calculated.

  In the calculation of the similarity of the radio wave intensity, the similarity is a value obtained by relatively comparing the radio wave intensity. For example, when calculating the similarity of the radio wave intensity between the first network information group and the second network information group collected from the terminal B1, the values of the radio wave intensity a and b2 of the first network information group are Normalize based on the maximum value of these values, normalize the values of the radio wave strengths b1 and b2 of the second network information group based on the maximum value of these values, and corresponding radio wave strengths based on these normalized values Compare the values of. By relatively comparing the radio field strengths in this way, it is possible to determine the distance between the terminal A and each of the terminals B1 and B2, regardless of the radio wave output level at the terminals B1 and B2.

  For the same reason as described above, even if there is a difference in radio wave sensitivity on the receiving side, it is possible to determine an adjacent terminal from the network similarity.

  The wireless LAN communication system of the present embodiment described above is an example of the present invention, and the configuration and operation thereof can be changed as appropriate without departing from the spirit of the invention. For example, in the configuration illustrated in FIG. 1, the wireless LAN terminals 200 to 400 may include the network information collection unit 112 and the network similarity calculation unit 113 illustrated in FIG. 2. In this case, for example, in the conference system, any of the wireless LAN terminals 100 to 400 can be used as the presenter's terminal.

  Further, in the wireless LAN terminal 100, the network similarity calculation unit 113 can connect only the terminal identification information of the wireless LAN terminal whose similarity is larger than the reference value among the wireless LAN terminals 200 to 400, to the connectable wireless LAN terminal information. May be displayed on the display unit 140. In this case, the user can connect to the adjacent terminal only by selecting the displayed wireless LAN terminal.

  Further, in the wireless LAN terminal 100, the CPU 110 may be configured to reject a connection request from a wireless LAN terminal whose similarity is equal to or less than a reference value. In this case, for example, in the conference system, if a third party other than the conference participant does not place his / her wireless LAN terminal adjacent to the presenter's wireless LAN terminal, the third party himself / herself becomes the presenter's wireless LAN terminal. Wireless LAN terminals cannot be connected. It is difficult to place the wireless LAN terminal adjacent to the presenter's wireless LAN terminal so that the third party is not aware of the presenter. Therefore, it is possible to enhance security from the viewpoint of preventing the contents of the announcement from leaking outside.

  Further, when there is a connection request from a wireless LAN terminal whose similarity is equal to or less than the reference value, the CPU 110 requests the wireless LAN terminal to transmit a password, and the password transmitted in response to the request is valid. It may be configured to determine whether or not the connection is permitted, and to permit the connection only when it is valid. Thereby, connection from a remote wireless LAN terminal is possible, and convenience is improved.

  Each of the wireless LAN terminals 100 to 400 includes a wired LAN interface, and the CPU 110 of the wireless LAN terminal 100 receives a connection request from any of the other wireless LAN terminals 200 to 400 through the wired LAN interface. Only a connection request from a wireless LAN terminal whose similarity is higher than a reference value may be permitted. In this case, for example, when the wireless LAN terminal 100 is a printer having an interface of a wireless LAN and a wired LAN, when data stored in the wireless LAN terminal is output by the printer, it is predetermined from the printer. Only a wireless LAN terminal within the range can output data to such a printer. As a result, it is possible to suppress data output from the wireless LAN terminal (outsider wireless LAN terminal) outside the predetermined range to the printer.

  Further, when there is a connection request through a wired LAN interface from a wireless LAN terminal whose similarity is equal to or lower than a reference value, the CPU 110 requests the wireless LAN terminal to transmit a password, and is transmitted in response to the request. It may be configured to determine whether or not the password is valid and permit the connection only when the password is valid. Thereby, security can be further strengthened.

  The present invention can be applied to a conference system and a presentation system using a wireless LAN network. The present invention also provides a communication system comprising a data processing device and a data storage device for storing data transmitted from the data processing device, a music / moving image transmitting device for transmitting music / moving image data, and a music / moving image. The present invention can be applied to a system including a music / moving image reproducing device that reproduces music / moving image data from a transmitting device.

It is a block diagram which shows schematic structure of the wireless LAN communication system which is one Embodiment of this invention. It is a block diagram which shows the function part used as the characteristic of the wireless LAN terminal 100 shown in FIG. It is a block diagram which shows the function part used as the characteristic of the wireless LAN terminal 200 shown in FIG. 6 is a flowchart for explaining a procedure of wireless LAN terminal name registration processing. It is a flowchart for demonstrating one procedure of a site survey process. It is a flowchart for demonstrating one procedure of the calculation process of adjacency. It is a schematic diagram which shows an example of the screen where the information of a wireless LAN terminal is displayed. It is a flowchart for demonstrating one procedure of the calculation process of a similarity degree.

Explanation of symbols

100 to 400 Wireless LAN terminal 110, 210 CPU
111, 211 Site survey processing unit 112 Network information collection unit 113 Network similarity calculation unit 120, 220 Wireless LAN communication unit 130, 230 Input unit 140, 240 Display unit 150, 250 Storage unit 212 Network information transmission processing unit

Claims (7)

A wireless LAN communication system comprising: a first wireless LAN terminal; and a plurality of second wireless LAN terminals that perform wireless communication with the first wireless LAN terminal,
Each of the first and second wireless LAN terminals periodically transmits a wireless signal including a network identifier for identifying a network for performing the wireless communication and address information of the terminal in the network,
Each of the second wireless LAN terminals is
The wireless signal is received from each of the first wireless LAN terminal and the other second wireless LAN terminal, and included in the received wireless signal and the radio field strength of the received wireless signal for each wireless LAN terminal. A first site survey processing unit for obtaining first network information including a network identifier and address information;
In response to a transmission request for network information, the first network information group for each wireless LAN terminal acquired by the first site survey processing unit, together with terminal identification information for identifying its own terminal, A network information transmitter for transmitting to the transmission request source,
The first wireless LAN terminal is
The wireless signal is received from each of the second wireless LAN terminals, and each wireless LAN terminal includes a radio field intensity of the received wireless signal and a network identifier and address information included in the received wireless signal. A second site survey processing unit for acquiring network information of 2;
A network information collection unit that transmits a transmission request for the network information to each of the second wireless LAN terminals, and collects the first network information group and terminal identification information for each wireless LAN terminal;
The correspondence between the second network information group for each wireless LAN terminal acquired by the second site survey processing unit and the first network information group for each wireless LAN terminal collected by the network information collection unit, Judgment is made based on the network identifier and address information included in each network information, and for each wireless LAN terminal, a radio field strength similarity is calculated by relatively comparing the radio field intensity included in the corresponding network information. A wireless LAN communication system comprising: a network similarity calculation unit; The first site survey processing unit uses the highest radio field strength value as the radio field intensity value of the radio signal received from each of the first wireless LAN terminal and the other second wireless LAN terminal. Normalized to
The second site survey processing unit normalizes the radio signal strength value of the radio signal received from each of the second wireless LAN terminals based on the highest radio field strength value,
The wireless LAN communication system according to claim 1, wherein the network similarity calculation unit calculates a radio field intensity similarity based on a difference between the normalized values of the radio field intensity between the corresponding network information. The first wireless LAN terminal includes a display unit,
The wireless LAN communication system according to claim 1, wherein the network similarity calculation unit displays terminal identification information of the second wireless LAN terminals on the display unit in descending order of the radio field intensity similarity.   The network similarity calculation unit includes only the terminal identification information of a wireless LAN terminal having a radio field intensity similarity larger than a reference value among the second wireless LAN terminals as information of a connectable wireless LAN terminal. The wireless LAN communication system according to claim 1, wherein the wireless LAN communication system is displayed. A wireless LAN communication system having a plurality of wireless LAN terminals for performing wireless communication,
Each of the plurality of wireless LAN terminals is
A wireless transmission unit for transmitting a wireless signal including a network identifier for identifying a network for performing the wireless communication and address information of the own terminal in the network;
The wireless signal is received from the wireless transmission unit of another wireless LAN terminal at a distance capable of wireless communication with the own terminal, and included in the received wireless signal and the radio field strength of the received wireless signal for each wireless LAN terminal A site survey processing unit for obtaining network information including network identifiers and address information,
In response to the network information transmission request, the network information group for each wireless LAN terminal acquired by the site survey processing unit is transmitted to the wireless LAN terminal of the transmission request source together with terminal identification information for identifying the own terminal. A network information transmitter to transmit;
Network information collection for transmitting the network information transmission request to the other wireless LAN terminal and collecting a network information group and terminal identification information for each wireless LAN terminal from the network information transmission unit of the other wireless LAN terminal And
The correspondence between the network information group for each wireless LAN terminal acquired by the site survey processing unit of its own terminal and the network information group for each wireless LAN terminal collected from the other wireless LAN terminal The network similarity calculation is performed based on the network identifier and address information included in the wireless LAN terminal, and for each wireless LAN terminal, the radio field strength similarity is calculated by relatively comparing the radio field strengths included in the corresponding network information. A wireless LAN communication system. A wireless signal including a network identifier for identifying a network for performing wireless communication and the address information of the own terminal in the network is periodically transmitted, and the wireless signal is received from another wireless LAN terminal. For each LAN terminal, a plurality of external wireless LAN terminals having a function of acquiring first network information including the radio wave intensity of the received wireless signal and the network identifier and address information included in the received wireless signal; A wireless LAN terminal connected by wireless communication,
A second radio signal is received from each of the external wireless LAN terminals, and each wireless LAN terminal includes a radio field intensity of the received wireless signal and a network identifier and address information included in the received wireless signal. A site survey processing unit for obtaining network information;
A network information collection unit that collects, from each of the external wireless LAN terminals, the first network information group for each wireless LAN terminal acquired in the external wireless LAN terminal together with terminal identification information that can identify the external wireless LAN terminal When,
The correspondence relationship between the second network information group for each wireless LAN terminal acquired by the site survey processing unit and the first network information group for each wireless LAN terminal collected by the network information collection unit is represented by each network. Network similarity that is determined based on the network identifier and address information included in the information, and calculates the radio field strength similarity by comparing the radio field intensity included in the corresponding network information for each wireless LAN terminal A wireless LAN terminal having a calculation unit. A method of determining a distance between a first wireless LAN terminal and a plurality of second wireless LAN terminals that perform wireless communication with the first wireless LAN terminal,
Each of the first wireless LAN terminal and the second wireless LAN terminal periodically transmits a wireless signal including a network identifier for identifying a network for performing the wireless communication and address information of the own terminal in the network. To
Each of the second wireless LAN terminals
Receiving the wireless signal from each of the first wireless LAN terminal and the other second wireless LAN terminal;
For each wireless LAN terminal, obtain the first network information including the radio field intensity of the received wireless signal and the network identifier and address information included in the received wireless signal;
In response to a transmission request for network information, the acquired first network information group for each wireless LAN terminal is transmitted to the transmission source of the network information transmission request together with terminal identification information for identifying the own terminal,
The first wireless LAN terminal is
Receiving the wireless signal from each of the second wireless LAN terminals;
For each wireless LAN terminal, obtain the second network information including the radio field intensity of the received wireless signal and the network identifier and address information included in the received wireless signal;
Transmitting a transmission request for the network information to each of the second wireless LAN terminals, collecting the first network information group and terminal identification information for each wireless LAN terminal;
The correspondence relationship between the acquired second network information group for each wireless LAN terminal and the collected first network information group for each wireless LAN terminal is represented in the network identifier and address information included in each network information. A wireless LAN terminal distance determination method that calculates a radio field intensity similarity that is determined based on a relative comparison of the radio field intensity included in corresponding network information for each wireless LAN terminal.

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