JP2010226239A - COMMUNICATION DEVICE, COMMUNICATION SYSTEM, COMMUNICATION METHOD, COMMUNICATION DEVICE PROGRAM - Google Patents

Abstract

When building an ad hoc network, if there are a plurality of communication devices in a detectable network around the device on which the network is to be constructed, it is difficult to construct the intended network, or connection It may be difficult to join the intended network.
Network identifier information is shared among a plurality of communication devices, a network is constructed based on the shared network identifier information, and other communication devices join the network based on the shared network identifier information. The same network can be configured between intended communication devices.
[Selection] Figure 1

Description

  The present invention relates to a communication device, a communication system, a communication method, and a program for the communication device.

In recent years, devices having wireless functions such as IEEE (Institute of Electrical and Electronics Engineers) 802.11 wireless LAN have been commercialized.
The IEEE 802.11 wireless LAN communication method includes an ad hoc mode in which a network is configured by directly communicating between terminals.
When configuring an ad hoc network, a terminal that intends to construct an ad hoc network opens a network using an SSID (Service Set Identification) of a network identifier. The first device in the ad hoc network generates a BSSID (Basic Service Set Identification) of a network identifier using a random number, and starts beacon transmission including the network identifier.
A terminal trying to construct an ad hoc network detects and extracts network identifier information of another terminal having the same SSID as that used for establishment, and compares the BSSID to determine whether to join the network of the other terminal. .
If a terminal trying to build an ad hoc network has the same comparison result, it ends the established network and joins the detected network so that terminals with multiple communication functions can configure different networks. Thus, it is possible to configure the same network between terminals intended for connection (see, for example, Patent Document 1).

JP 2007-221559 A

In the conventional method, it is necessary to determine the SSID between terminals in advance.
In addition, when there are a plurality of terminals set to the same SSID in the vicinity of a terminal that is going to construct an ad hoc network, when each terminal tries to open a network at the same time, a network having a different BSSID temporarily Composed. For this reason, each terminal confirms the SSID and BSSID of its own terminal and other terminals, and if they are the same, the establishment of the network once established by one of the terminals is terminated. Furthermore, the terminal that has completed the establishment of the network needs to join a network having the same SSID.
In addition, when there are a plurality of terminals having the same SSID around the terminal where the ad hoc network is to be constructed, it cannot be determined from the SSID which terminal is the terminal that the user intends to connect to. However, there was a problem that participated in the network opened up to the terminal that is not intended to connect.
Further, when another network having the same SSID and different BSSID exists, a terminal trying to construct an ad hoc network cannot detect another network having the same SSID and tries to join the network. When a terminal can detect another network with the same SSID, there is a problem that it may be difficult to construct a network intended for connection because the terminal intended for connection has already joined the other network. It was.

  An object of the present invention is to make it possible to configure the same network among a plurality of communication devices intended to participate in the same network.

In order to achieve the above object, the present invention provides a communication system that performs wireless communication between a first communication device that constructs a network using network identifier information and a second communication device that joins the network.
The first communication device is:
Network identifier sharing means for transmitting or receiving and sharing network identifier information with the second communication device;
Ad hoc network construction means for configuring an ad hoc network using the shared network identifier information;
Network subscription accepting means for accepting a network subscription from the second communication device having the shared network identifier information for constructing the ad hoc network;
With
The second communication device is:
Network identifier sharing means for receiving or transmitting and sharing network identifier information with the first communication device;
Network receiving means for receiving network information including the network identifier information from a network existing around the second communication device;
Network identifier extracting means for extracting network identifier information from the network information received by the network receiving means;
Network identifier comparing means for comparing the network identifier extracted by the network identifier extracting means with the shared network identifier;
Network joining means for joining a network whose network identifier is determined to be the same as the shared network identifier by the network identifier comparing means;
It is characterized by having.

Further, according to the present invention, the network identifier information sharing means of the first communication device includes:
Network receiving means for receiving network information including the network identifier information from a network existing around the first communication device;
Network identifier extracting means for extracting network identifier information from the network information received by the network receiving means;
Network identifier generating means for generating a network identifier list;
Network identifier information selecting means for selecting network identifier information from the network identifier information list;
Network identifier comparison means for comparing the network identifier extracted by the network identifier extraction means with the network identifier selected by the network identifier selection means;
As a result of the comparing means, if the selected network identifier is the same as the extracted network identifier, a network identifier selecting means for reselecting a network identifier from the network identifier information list;
A network identifier transmission means for connection for transmitting the selected network identifier to the second communication device,
Means for sharing the network identifier information of the second communication device;
A connection network identifier receiving means for receiving the connection network identifier from the first communication device is provided.

Furthermore, the present invention provides means for sharing the network identifier information of the second communication device,
Network identifier information selecting means for selecting network identifier information from the network identifier information list;
Network identifier comparison means for comparing network identifiers extracted by the network identifier extraction means;
As a result of the comparison means, if the extracted network identifier is the same, a network identifier selection means for reselecting a network identifier from the network identifier information list;
A network identifier transmission means for connection that transmits the selected network identifier as a network identifier for connection to the first communication device;
The network identifier information sharing means of the first communication device includes:
A connection network identifier receiving means for receiving the connection network identifier from the second communication device;
It is characterized by having.

Furthermore, the present invention provides a communication system that performs wireless communication between a first communication device that constructs a network using network identifier information and a second communication device that joins the network.
The network identifier list generating means of the first communication device generates a plurality of network identifiers by a predetermined method,
The network identifier list generating means of the second communication device generates a plurality of network identifiers by a predetermined method.

Furthermore, the present invention provides a communication system that performs wireless communication between a first communication device that constructs a network using network identifier information and a second communication device that joins the network.
The network identifier list generating means of the first communication device generates a plurality of network identifiers from information generated in advance,
The network identifier list generating means of the second communication device generates a plurality of network identifiers from information generated in advance.

Furthermore, the present invention provides a communication method for performing wireless communication between a first communication device that constructs a network using network identifier information and a second communication device that joins the network.
A network identifier sharing step in which the second communication device transmits or receives and shares network identifier information with the first communication device;
A network identifier sharing step in which the first communication device receives or transmits network identifier information with the second communication device; and
An ad hoc network construction step in which the first communication device forms an ad hoc network using the shared network identifier information;
A network receiving step in which the second communication device receives network information including the network identifier information from a network existing around the second communication device;
A network identifier extracting step in which the second communication device extracts network identifier information from the network information received by the network receiving means;
A network identifier comparison step in which the second communication device compares the network identifier extracted by the network identifier extraction means with the shared network identifier;
A network joining step in which the second communication device joins a network in which the network identifier is determined to be the same as the shared network identifier by the network identifier comparing means;
The first communication device includes a network subscription acceptance step of accepting a network subscription from the second communication device having the network identifier information to be shared in order to construct the ad hoc network.

Furthermore, the present invention provides a program for a communication device that performs wireless communication between a first communication device that constructs a network using network identifier information and a second communication device that joins the network.
In the computer of the first communication device,
A network identifier sharing step of receiving or transmitting network identifier information to and sharing with the second communication device;
An ad hoc network construction step for constructing an ad hoc network using the shared network identifier information;
A network subscription acceptance step for accepting a network subscription from the second communication device having the shared network identifier information for the ad hoc network construction;
It is characterized by executing.

Furthermore, the present invention provides a program for a communication device that performs wireless communication between a first communication device that constructs a network using network identifier information and a second communication device that joins the network.
In the computer of the second communication device,
A network identifier sharing step of transmitting or receiving and sharing network identifier information with the first communication device;
A network receiving step of receiving network information of the network identifier information from a network existing around the second communication device;
A network identifier extracting step for extracting network identifier information from the network information received by the network receiving means;
A network identifier comparison step of comparing the network identifier extracted by the network identifier extraction means with the shared network identifier;
A network joining step of joining a network in which the network identifier is determined to be the same as the shared network identifier by the network identifier comparing means;
It is characterized by executing.

Furthermore, the present invention provides a communication apparatus that performs wireless communication between a first communication apparatus that constructs a network using network identifier information and a second communication apparatus that joins the network.
Network identifier sharing means for transmitting or receiving and sharing network identifier information with the second communication device;
Ad hoc network construction means for configuring an ad hoc network using the shared network identifier information;
Network subscription accepting means for accepting a network subscription from the second communication device having the shared network identifier information for constructing the ad hoc network;
It is characterized by having.

Furthermore, the present invention provides a communication apparatus that performs wireless communication between a first communication apparatus that constructs a network using network identifier information and a second communication apparatus that joins the network.
Network identifier sharing means for receiving or transmitting and sharing network identifier information with the first communication device;
Network receiving means for receiving network information including the identifier information from a network existing around the second communication device;
Network identifier extracting means for extracting network identifier information from the network information received by the network receiving means;
Network identifier comparing means for comparing the network identifier extracted by the network identifier extracting means with the shared network identifier;
Network joining means for joining a network whose network identifier is determined to be the same as the shared network identifier by the network identifier comparing means;
It is characterized by having.

  According to the present invention, a plurality of communication devices share network identifier information, and based on the shared network identifier information, the first communication device opens an ad hoc network and waits for subscription from another communication device. Since the other communication devices participate in the established network based on the network identifier information shared with the first communication device, it becomes possible to configure the same network between the communication devices intended for connection. In addition, the reliability of communication connectivity can be improved and the convenience of the user can be improved.

It is the schematic of the radio | wireless communication network structure in 1st-4th embodiment. It is an internal block diagram of the computer of 1st Embodiment. It is an internal structure of the projector of 1st Embodiment. It is a flowchart which shows the projector operation | movement of 1st Embodiment. It is a flowchart which shows the computer operation | movement of 1st Embodiment. It is an internal block diagram of the computer of 2nd Embodiment. It is a flowchart which shows the computer operation | movement of 2nd Embodiment. It is an internal block diagram of the projector of 3rd Embodiment. It is a flowchart which shows the projector operation | movement of 3rd Embodiment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. In addition, this invention is not limited to the embodiment which concerns, A various change is possible within the range of the technical thought.

[First embodiment]
FIG. 1 is a schematic diagram illustrating an example of a wireless communication network configuration according to the first embodiment of the present invention. The computer 1 or 2 and the projector 3 or 4 are communication devices that can communicate. The wireless communication detectable range 5 is a wireless communication range that can be detected by the computer 1, and the wireless communication detectable range 6 is detected by the computer 2. It is a possible wireless communication range.
In the present embodiment, an example in which an ad hoc network is constructed between the computer 1 or 2 and the projector 3 or 4 will be described below.
In the following description, it is assumed that the computer connection software is also installed in the computers 1 and 2.

  FIG. 2 is a schematic diagram of each internal configuration of the computer 1 or 2 according to the first embodiment.

  The computer 100 is an example of a communication device in the present embodiment.

  The network 101 is an IEEE 802.11 wireless LAN network.

The communication control unit 102 performs communication control with the projector 200 (FIG. 3) through the network 101, receiving a beacon that is a notification signal issued when a network existing around the computer 100 is opened.
Further, the communication control unit 102 receives network identifier information from the ad hoc network construction unit 105 when the ad hoc network is established, and uses the received network identifier information to send a beacon of notification information by the ad hoc network establishment to the network 101. send.
In addition, the communication control unit 102 passes the beacon signal received from the network 101 to the network detection unit 106.
Further, the communication control unit 102 transmits the device type information command from the network connection device determination unit 110 to the network 101, further receives a response to the device type information command from the network 101, and passes it to the network connection device determination unit 110. .

The connection SSID transmission / reception unit 103 receives a connection SSID from a connection SSID transmission / reception unit 203 (FIG. 3), which will be described later, of the projector 200 via a USB (Universal Serial Bus) I / F (not shown).
With this procedure, the computer 100 and the projector 200 share the connection SSID.
The connection SSID transmission / reception unit 103 transmits the received connection SSID to the network identifier SSID creation unit 104.

The connection SSID creation unit 104 creates a network identifier SSID having the same information as the connection SSID received from the connection SSID transmission / reception unit 103.
Further, the network identifier SSID creation unit 104 transmits the created connection SSID to the ad hoc network construction unit 105.
Further, the connection SSID creation unit 104 stores the connection SSID in the network identifier storage unit 108.

The ad hoc network construction unit 105 receives the connection SSID created from the connection SSID creation unit 104.
The ad hoc network creation unit 105 also receives the BSSID created by the BSSID creation unit 107.
Further, the ad hoc network creation unit 105 uses the connection SSID received from the connection SSID creation unit 104 and the network identifier BSSID created by the BSSID creation unit 107 to ad hoc to the network 101 via the communication control unit 102.・ Start building the network.
That is, the ad hoc network creation unit 105 transmits a beacon of a network establishment notification signal including identifier information to the network 101 via the communication control unit 102.

The network detection unit 106 receives a beacon transmitted from the network 101 around the computer 100.
In addition, the network detection unit 106 extracts network identifier information (SSID and BSSID) from the received beacon and transmits it to the ad hoc network creation unit 105.

The BSSID creation unit 107 creates a BSSID using random numbers.
The network identifier BSSID creation unit 107 transmits the created BSSID to the ad hoc network construction unit 105 and also saves it in the network storage unit 108.

  The network identifier storage unit 108 stores the connection SSID created by the connection SSID creation unit 104 and the BSSID created by the BSSID creation unit 108.

  After the ad-hoc network construction unit 105 starts transmitting a beacon for network establishment, the network subscription standby unit 109 joins the network to which the projector 200 having the same BSSID created by the connection SSID and the BSSID creation unit 107 joins the established network. Wait to do.

The network connection device determination unit 110 issues a device type information command to a device that has joined the ad hoc network established by the ad hoc network construction unit 105.
Further, the network connection device determination unit 110 receives a response to the issued device type information command.
Further, the network connection device determination unit 110 determines the device type participating in the ad hoc network from the response to the received device type information command.

  FIG. 3 is a schematic diagram of each internal configuration of the projector 3 or 4 according to the first embodiment.

  The projector 200 is an example of a communication device in the present embodiment.

  The network 201 is an IEEE 802.11 wireless LAN network.

The communication control unit 202 receives a beacon for establishing a network and controls communication with the computer 100 via the network 201.
In addition, the communication control unit 202 passes the beacon signal received from the network 201 to the network detection unit 204.
The communication control unit 202 also receives network identifier information for performing network subscription processing from the network subscription processing unit 208 and transmits network subscription information including the network identifier information to the network 201.
In addition, the communication control unit 202 receives the device type information command from the network 101, passes it to the device type information issuing unit 209, and further sends the response from the device type information issuing unit 209 to the device type information command to the network 201.

The connection SSID transmission / reception unit 203 issues a connection SSID to the connection SSID transmission / reception unit 103 of the computer 100 via a USB I / F (not shown) or the like.
Further, the connection SSID transmission / reception unit 203 transmits the connection SSID issued to the network identifier comparison unit 205 and stores it in the network identifier storage unit 207.

The network detection unit 204 receives network information including network identifier information from the network existing around the projector 200 from the communication control unit.
Further, the network detection unit 204 extracts network identifier information (SSID and BSSID) from the received network information, and transmits the network identifier information to the network identifier comparison unit 205.

The network identifier comparison unit 205 receives the network identifier information (SSID and BSSID) created by the network detection unit 204.
The network identifier comparison 205 compares the SSID extracted by the network detection unit 204 with the connection SSID issued by the connection SSID transmission / reception unit 203.
The network identifier comparison 205 transmits the BSSID of the network having the matched SSID to the BSSID creation unit 206 when the comparison result matches.

The BSSID creation unit 206 receives the BSSID of the network that matches the connection SSID from the network identifier comparison unit 205.
The BSSID creation unit 206 creates the same network identifier BSSID as the received BSSID.
The network identifier BSSID creation unit 206 stores the created BSSID in the network identifier storage unit.

The network storage unit 207 stores the connection SSID issued by the connection SSID transmission / reception unit 203 and the BSSID created by the BSSID creation unit 207.
Further, after both the connection SSID and BSSID are stored, the network storage unit 207 transmits the stored connection SSID and BSSID to the network subscription processing unit 208.

The network subscription processing unit 208 receives the connection SSID and BSSID from the network storage unit 207.
Further, the network subscription processing unit 208 transmits information and commands necessary for network subscription to the communication control unit 202 using the connection SSID and BSSID.

  The device type information issuing unit 209 receives a device type information command from the network computer 100 to which the projector 200 has joined, and transmits the device type information of the projector 200 to the communication control unit 202 as a response to the device type information command.

  2 and 3 of the present embodiment are functions of a ROM (Read Only Memory), a HDD (Hard Disk Drive), or a USB I / O connected to a CPU (Central Processing Unit) (not shown) in the computer 100 or the projector 200. It can also be executed by a program stored in a USB memory or the like connected via F.

  Next, the network connection operation of the projector 200 of the first embodiment will be described using the flowchart of FIG.

The connection SSID transmission / reception unit 203 of the projector 200 issues a network identifier SSID as a connection SSID to the connection SSID transmission / reception unit 103 of the computer 100 via a USB I / F (not shown) (S1).
The subsequent SSID is stored and shared in the network identifier storage units 108 and 207 of the computer 100 and the projector 200, respectively.

Next, the network detection unit 204 receives network information from the communication control unit 202 (S2).
In addition, the network detection unit 204 extracts the SSID and BSSID from the detected network information and transmits them to the network identifier comparison unit 205.

  The network identifier comparison unit 205 compares the network SSID extracted by the network detection unit 204 with the connection SSID issued by the connection SSID transmission / reception unit 203 (S3).

  In S3, if the comparison result between the SSID extracted by the network detection unit 204 and the connection SSID matches, the network identifier comparison unit 205 determines the network information of the computer 100 that has received the connection SSID issued in S1, It is determined that there is a network to which the projector 200 intends to connect (S3 YES).

  In S3, if the comparison result between the SSID for connection and the SSID detected by the network detection unit 204 does not match, the network identifier comparison unit 205 determines that there is no network intended for connection (S3 NO), and a certain waiting time. If the set time has not been exceeded (S4 NO), the process waits until a network intended for connection is detected (S2-4).

  In S4, when a certain waiting time is exceeded (S4 YES), it is determined that a network having a connection SSID has not yet been constructed around the projector, and a series of processing ends.

  Next, the BSSID creation unit 206 receives the BSSID of the network having the connection SSID from the network identifier comparison unit 205 (S5).

Next, the BSSID creation unit 206 creates the same BSSID as the BSSID received from the network identifier comparison unit 205 (S6).
The network identifier BSSID creation unit 206 stores the created BSSID in the network identifier storage unit 207.

  Next, the network subscription processing unit 208 uses the connection SSID and BSSID stored in the network identifier storage unit 207 to perform command processing for joining the same ad hoc network as the connection SSID, and the communication control unit 202. (S7).

  Next, the device type information issuing unit 209 receives the device type information command issued by the network connection device determining unit 110 of the computer 100 from the network and communication control unit 202 (S8).

Subsequently, the device type information issuing unit 209 transmits the device type information of the projector 200 to the communication control unit 202 as a response to the device type information command (S9).
With this procedure, the computer 100 determines that the device type that has joined the ad hoc network is a projector, and starts image distribution, for example.
As described above, the projector 200 issues a connection SSID to the computer 100, detects the network information of the computer 100 that has received the connection SSID, and joins the detected network. Subscription is completed and communication is started.

  Next, the network connection operation of the computer 100 of the first embodiment will be described using the flowchart of FIG.

  The connection SSID transmission / reception unit 103 of the computer 100 receives the network identifier SSID as the connection SSID from the connection SSID transmission / reception unit 203 of the projector 200 via a USB I / F (not shown) (S101).

The network identifier SSID creation unit 104 creates a network identifier SSID for creating an ad hoc network that is the same as the received connection SSID (S102), and stores it in the network identifier storage unit.
The connection SSID created by the network identifier SSID creation unit 104 is transmitted to the ad hoc network creation unit 105.

  The BSSID creation unit 107 creates a BSSID with a random number and stores it in the network identifier storage unit 108 (S103).

The ad hoc network creation unit 105 starts building an ad hoc network using the connection SSID created by the connection SSID creation unit 104 and the BSSID created by the BSSID creation unit 107 (S104).
That is, the ad hoc network creation unit 105 transmits a beacon of a network establishment notification signal including network identifier information to the network 101 via the communication control unit 102.

  After the ad hoc network construction is started, the network detection unit 106 and the network participation standby unit 109 wait for the connection SSID intended for connection to join if the predetermined standby time has not been exceeded (NO in S106) ( S105-106).

  In S106, when a certain waiting time is exceeded (S106 YES), it is determined that the projector having the connection SSID around the computer has not yet started the joining procedure, and the series of processing ends.

  If it is detected in S105 that a device having a connection SSID has been added to the network (YES in S105), it is determined as network information from the projector 200 that issued the connection SSID received in S101, and the network detection unit 106 and the network The subscription standby unit 107 performs network subscription processing such as terminating subscription acceptance to the network and starting communication with the subscribed device via the communication control unit 102 (S107).

  Next, the network connection device determination unit 110 delivers a device type information command for obtaining device type information to a device that has joined the network to the communication control unit 102 (S108).

  In addition, the network connection device determination unit 110 receives device type information in response to the device type information command from the communication control unit 102 from the devices participating in the network (S109).

  Further, the network connection device determination unit 110 extracts the projector specific information from the response of the device type information command received from the communication control unit 102, determines that the device participating in the network is a projector, and starts, for example, video distribution (S109).

As described above, according to the present embodiment, the computer and the projector that are intended to connect to the same network transmit the connection SSID, which is network identifier information, from the projector to the computer, and store and share the information in each device. .
Furthermore, using the transmitted SSID for connection, the computer starts construction of an ad hoc network and waits for a joining process from the projector.
In addition, the projector waits for the start of network construction using the connection SSID transmitted to the computer, and when network information having the connection SSID is detected, it joins the network, so the connection between the computer intended for connection and the projector The same network can be reliably configured.

  These operations performed on the computer can also be realized by a projector connection application installed on the computer.

[Second Embodiment]
Next, a second embodiment will be described with reference to FIGS. Note that the network configuration, the internal configuration diagram of the projector, and the operation flowchart of the projector are the same as those in the first embodiment (FIGS. 1, 3 and 4), and thus description thereof is omitted.

FIG. 6 is a schematic diagram of each internal configuration of the computer 1 or 2 according to the second embodiment. The same functional units as those in the first embodiment are denoted by the same reference numerals as those in FIG.
The difference from the first embodiment is a connection SSID transceiver 301, a connection SSID list creation unit 302, a network identifier comparison unit 303, and a connection SSID creation unit 304.

  The computer 300 is an example of an image supply device in the present embodiment.

The connection SSID transmission / reception unit 301 uses the network identifier SSID that does not exist in the periphery of the computer 300 among the connection SSID candidates created by the connection SSID list creation unit 302 as a connection SSID candidate. Receive from.
The connection SSID transmission / reception unit 301 issues connection SSID information to the connection SSID transmission / reception unit 203 of the projector 200 via a USB I / F (not shown).

The connection SSID creation unit 302 is a connection SSID stored in a ROM, HDD, or USB memory connected via a CPU (not shown) in the computer 300 by a method described later. Based on the list creation information, a connection SSID list having at least two connection SSID candidates is created.
Also, the connection SSID list creation unit 302 selects one connection SSID candidate from the created connection SSID list based on the connection SSID list creation information, and transmits it to the network identifier comparison unit 303.
Further, the connection SSID creation unit 302 selects the second candidate, the third candidate, and the like according to the comparison result of the network identifier comparison unit 303 and transmits the second candidate, the third candidate, and the like to the network identifier comparison unit 303.

The network detection unit 106 detects network information including network identifier information from the network 101 around the computer 300 via the communication control unit 102.
Further, the network detection unit 106 extracts the SSID from the detected network information and transmits it to the network identifier comparison unit 303.

The network identifier comparison unit 303 compares the connection SSID candidate created by the connection SSID creation unit 302 with the SSID extracted by the network detection unit 106.
As a result of the comparison, the network comparison unit 303 determines that the connection SSID candidate already exists on the network 201 when the connection SSID candidate and the SSID extracted by the network detection unit 106 are the same. The SSID list creation unit 302 is requested to reselect SSID candidates for connection.
Further, if the SSID extracted by the network detection unit 304 is different from the connection SSID candidate as a result of the comparison, the network identifier comparison unit 303 displays the connection SSID candidate received from the connection SSID creation unit 302 on the network 201. It is determined that it does not exist, and the connection SSID candidate is transmitted to the connection SSID creation unit 304.

The connection SSID creation unit 304 creates a connection SSID for creating an ad hoc network identical to the connection SSID candidate received from the network identifier comparison unit 303.
Also, the connection SSID creation unit 304 transmits the created connection SSID to the ad hoc network creation unit 105 and stores it in the network identifier storage unit 109.

Hereinafter, as in the first embodiment, the ad hoc network creation unit 105 opens an ad hoc network using the connection SSID created by the network identifier SSID creation unit 304 and the BSSID created by the BSSID creation unit 108. A beacon of a notification signal is transmitted.
Further, after starting the ad hoc network construction, the projector having the connection SSID performs the joining process, thereby completing the same network connection.

  Further, each function of FIG. 6 of the present embodiment is stored in a ROM, a HDD connected to a CPU (Central Processing Unit) (not shown) in the computer 300, a USB memory connected via a USB I / F, or the like. It is also possible to execute it by a program.

  Next, the network connection operation of the computer 300 of the second embodiment will be described using the flowchart of FIG.

  The connection SSID list creation unit 302 of the computer 300 is for connection stored in a ROM, HDD, or a USB memory connected via a USB I / F connected to a CPU (not shown) in the computer 300 described later. Based on the SSID list creation information, a connection SSID list having at least two or more connection SSID candidates is created (S201).

  Next, the connection SSID list creation unit 302 selects one connection SSID candidate from the created connection SSID list based on the connection SSID list creation information, and transmits it to the network identifier comparison unit 303 (S202).

The network detection unit 106 detects network information including network identifiers of networks existing around the computer 300 via the communication control unit 102 (S203).
Further, the network detection unit 106 extracts the network identifier SSID and BSSID from the detected network information, and transmits them to the network identifier comparison unit 303.

  The network identifier comparison unit 303 compares the connection SSID candidate created by the connection SSID list creation unit 302 with the network identifier SSID extracted by the network detection unit 106 (S204).

  In S204, when the network identifier comparison unit 303 determines that there is the same network identifier SSID as the connection SSID candidate (YES in S204), a network having the same SSID as the connection SSID candidate already exists around the computer 300. The connection SSID list creation unit 302 is requested to reselect a new connection SSID candidate (S202, S203).

  If the network identifier comparison unit 303 determines in S204 that there is no network identifier SSID identical to the connection SSID candidate (NO in S204), the connection SSID candidate is formally determined as the connection SSID (S205), and the connection SSID is determined. The candidate is transmitted to the connection SSID creation unit 304.

The connection SSID creation unit 304 creates the same connection SSID as the connection SSID candidate received from the network identifier comparison unit 303 (S206).
Further, the connection SSID creation unit 304 transmits the created connection SSID to the connection SSID transmission / reception unit 301.

  Thereafter, operations similar to those in the operation flowcharts S103 to S110 in FIG. 5 of the first embodiment are performed, and transmission of a beacon including network identifier information is started by opening an ad hoc network, and a connection SSID to be shared with the opened network is set. When the projector has been subscribed, a network subscription process, acquisition and discrimination of the subscribed device type, and the like are performed.

As described above, according to the present embodiment, the computer includes a plurality of defined connection SSID candidate creation methods and selection methods, and selects a connection SSID from the plurality of connection SSID candidates.
In addition, the computer detects the network information of the network around the computer in advance, extracts the network identifier from the network information, and compares it with the selected connection SSID candidate, so that the connection SSID that does not exist in its own peripheral network Select.
Next, the selected connection SSID is transmitted from the computer to the projector, and the connection SSID for connection is shared.
Further, based on the transmitted SSID for connection, the computer starts building an ad hoc network and waits for the projector to join.
In addition, the projector detects network information having the same SSID as the connection SSID received from the computer, and joins the network with the connection SSID, so that the same network is securely connected between the computer intended for connection and the projector. Can be configured.

[Third embodiment]
FIG. 8 is a schematic diagram of each internal configuration of the projector 1 or 2 according to the third embodiment. The same functional units as those in the first embodiment are denoted by the same reference numerals as those in FIG.
The difference from the first embodiment is a connection SSID transceiver 401, a connection SSID list creation unit 402, a network identifier comparison unit 403, and a connection SSID creation unit 404.

  The projector 400 is an example of an image supply device in the present embodiment.

The connection SSID transmission / reception unit 401 of the projector 400 uses a network identifier SSID that does not exist in the vicinity of the projector 400 among the connection SSID candidates created by the connection SSID list creation unit 402 as a connection SSID candidate. Received from the creation unit 404.
The connection SSID transmission / reception unit 401 issues connection SSID information to the connection SSID transmission / reception unit 103 of the computer 100 via a USB I / F (not shown).

The connection SSID creation unit 402 is based on connection SSID list creation information stored in a ROM, HDD, or a USB memory connected via a USB I / F connected to a CPU (not shown) in the projector 400. Then, a connection SSID list having at least two or more connection SSID candidates is created.
Further, the connection SSID list creation unit 302 selects one connection SSID candidate from the created connection SSID list based on the connection SSID list creation information, and transmits the connection SSID candidate to the network identifier comparison unit 403.
Further, the connection SSID creation unit 402 selects the second candidate, the third candidate, and the like according to the comparison result of the network identifier comparison unit 403 and transmits the second candidate, the third candidate, and the like to the network identifier comparison unit 403.

The network detection unit 204 detects network information including a network identifier from the network 201 around the projector 400 via the communication control unit 202.
Further, the network detection unit 204 extracts the SSID from the detected network information and transmits it to the network identifier comparison unit 403.

The network identifier comparison unit 403 compares the connection SSID candidate received from the connection SSID creation unit 402 with the SSID extracted by the network detection unit 204.
If the SSID extracted by the network detection unit 204 is the same as the connection SSID candidate as a result of the comparison, the network identifier comparison unit 403 determines that the connection SSID candidate already exists on the network 201, and connects The SSID list creation unit 402 is requested to reselect connection SSID candidates.
Furthermore, if the SSID extracted by the network detection unit 204 is different from the connection SSID candidate as a result of the comparison, the network identifier comparison unit 403 displays the connection SSID candidate received from the connection SSID creation unit 402 on the network 201. It is determined that it does not exist, and the connection SSID candidate is transmitted to the connection SSID creation unit 404.

The connection SSID creation unit 404 creates a connection SSID for creating an ad hoc network that is the same as the connection SSID candidate received from the network identifier comparison unit 403.
Also, the connection SSID creation unit 404 saves the created connection SSID in the network identifier storage unit 207.

  Hereinafter, similarly to the first embodiment, the network information of the ad hoc network having the connection SSID is detected, the BSSID is further extracted from the detected network information, and the connection is shared using the connection SSID and the extracted BSSID. Complete the subscription to the network intended for the connection with the SSID for use.

  Next, the network connection operation of the projector 400 of the third embodiment will be described using the flowchart of FIG.

  The connection SSID list creation unit 402 of the projector 400 includes a connection SSID list stored in a ROM, HDD, USB memory connected via a USB I / F, or the like connected to a CPU (not shown) in the projector 400. Based on the creation information, a connection SSID list having at least two or more connection SSID candidates is created (S301).

  Next, the connection SSID list creation unit 402 selects one connection SSID candidate from the created connection SSID list based on the connection SSID list creation information, and transmits it to the network identifier comparison unit 403 (S302). ).

The network detection unit 204 detects network information including a network identifier from a network existing around the projector 400 via the communication control unit 202 (S303).
Further, the network detection unit 204 extracts the network identifier SSID and BSSID from the detected network information, and transmits them to the network identifier comparison unit 403.

  The network identifier comparison unit 403 compares the connection SSID candidate created by the connection SSID list creation unit 402 with the network identifier SSID extracted by the network detection unit 204 (S304).

  In S304, when the network identifier comparison unit 403 determines that there is the same network identifier SSID as the connection SSID candidate (YES in S304), a network having the same SSID as the connection SSID candidate already exists around the projector 400. The connection SSID list creation unit 402 is requested to reselect connection SSID candidates (S302, S303).

  In S304, when the network identifier comparison unit 403 determines that there is no network identifier SSID identical to the connection SSID candidate (NO in S304), the network identifier comparison unit 403 formally determines the connection SSID candidate as the connection SSID. (S305), the connection SSID candidate is transmitted to the connection SSID creation unit 404.

The connection SSID creation unit 404 creates the same connection SSID as the received connection SSID candidate (S306).
In addition, the connection SSID creation unit 404 transmits the created connection SSID to the connection SSID transmission / reception unit 301.

  Thereafter, the same operations as those in the flowcharts S2 to S9 in FIG. 4 of the first embodiment are performed, and the construction of the same ad hoc network as the connection SSID is started after waiting for the same ad hoc network as the connection SSID to be constructed. If so, a subscription process is performed, and device type information is issued.

As described above, according to this embodiment, the projector includes the defined connection SSID candidate creation method and selection method, and selects the connection SSID.
In addition, the projector detects network information around the projector in advance, extracts a network identifier from the network information, compares the selected SSID candidate for connection with the extracted network identifier, and exists in the peripheral network of the projector. Select a connection SSID that does not exist.
Next, the selected connection SSID is transmitted from the projector to the computer, and the connection SSID for connection is shared.
Furthermore, based on the transmitted SSID for connection, the network information of the newly established ad hoc network is detected and the join process is performed on the network, so that the same network is securely connected between the computer and the projector intended for connection. Can be configured.

  Next, the connection SSID list creation method and the connection SSID candidate selection method used in the second and third embodiments will be described with reference to Tables 1 and 2.

As shown in Table 1, the first connection SSID list creation method and the connection SSID candidate selection method are methods for creating a connection SSID list using a combination of a specific character string and a changing character string.
In Table 1, “connect_req_” in the first half is a specific character string and does not change. The numerical part in the latter half is a character string that changes. For example, it starts from 1 and is incremented by 1 for example.
In this way, the SSID list for connection is created while ranking at the time of selection. The connection SSID list creation unit 302 or 402 in each device selects a connection SSID candidate based on the set order.
A method for changing and combining these specific character strings and changing character strings is connected as SSID list creation information for connection via a ROM, HDD, or USB I / F connected to a CPU (not shown) in each device. Defined and stored in a USB memory or the like.

  In the present embodiment, the method of creating a list by the connection SSID list creation unit has been described above. However, after the network identifier SSID that is the same as the connection SSID candidate is detected by network detection, the second and third The connection SSID candidates may be created in a timely manner by a defined method.

  Furthermore, in this embodiment, the connection SSID list creation method and the connection SSID candidate selection method are stored in either a computer or a projector, or a USB memory connected via a USB I / F. However, the same effect can be obtained even if it is stored in both the computer and the projector.

Next, a second connection SSID list creation method and a connection SSID candidate selection method will be described with reference to Table 2. As shown in Table 2, SSID candidates for connection and selection orders may be created in advance, and all data may be held.
The connection SSID candidate created in advance is preferably a meaningless and random character string that is unlikely to overlap with an identifier SSID of another network, and a number of connection SSID candidates are created and held. Is desirable.
Further, the connection SSID candidates may be arbitrarily selected and used without setting the selection order for the connection SSID candidates.

  In addition, the connection SSID list creation method has several methods at the same time, and the same effect can be obtained even if the user uses them according to the usage or situation.

  Furthermore, in this embodiment, in this embodiment, the connection SSID list and the connection SSID candidate selection method are stored in either a computer or a projector, or a USB memory connected via the USB I / F. However, the same effect can be obtained even if it is stored in both the computer and the projector.

[Fourth embodiment]
In the second and third embodiments, the example of selecting the connection SSID, starting the construction of the ad hoc network, and joining the established network has been described. However, these operations are performed periodically. There is.
For example, a plurality of computers and projectors exist in a company, and the installation location of the apparatus moves due to a meeting or the like, and the setting of the apparatus is often changed.
In such a case, since the connection SSID is selected and the network is constructed every time, for example, when a different apparatus constructs a network in this embodiment in the adjacent conference room, the connection SSID is selected by the same method. In this case, there is a possibility that a connection SSID candidate already exists around the apparatus.
In such a case, in the second and third embodiments, the connection SSID list creation method and the connection SSID candidate selection method further arbitrarily select a meaningless character string as shown in Table 2 above. Better way

Furthermore, a method for reducing the possibility of overlapping connection SSID candidates and reducing operations such as network detection for selecting connection SSID candidates will be described with reference to the flowchart of FIG. The description of the same operation as that of the second embodiment is omitted.
After the connection SSID candidate is determined from the connection SSID candidates (S205), the selected connection SSID candidate is deleted from a program or list such as a USB memory connected via a ROM or USB I / F (not shown) in the computer 300. Or set the used settings.
Thereafter, the operation is performed as in the second embodiment.

Furthermore, the deletion or used setting from the list of connection SSID candidates that have been used once may be performed after the network establishment cancellation or participation cancellation.
As described above, according to the present embodiment, a connection SSID candidate used once at the time of establishing a network is deleted from the connection SSID list or set to be used in a program such as a device or a USB memory. As a result, for example, when a computer or projector having the second embodiment is newly added, the possibility of overlapping SSID candidates for connection with the newly added device is reduced, and a more reliable and simple network connection system is achieved. Can be provided.

Furthermore, when the computer or the network information existing in the vicinity of the own computer is detected, the network detection unit 106 or 204 of each device may detect the channel of the wireless communication network used by the detected network information. good.
In this case, according to the detection result of the channel of the wireless communication network, the ad hoc network creation unit 105 of the computer creates an ad hoc network in preference to the vacant channel over other channels.
As described above, it is also possible to reduce interference in the wireless communication network.

In the first to fourth embodiments, an example in which a computer is used as an example of an image supply device has been described.
Moreover, although the example which uses a projector as an image display apparatus was demonstrated, the computer with an image display part, a portable terminal, etc. may be sufficient.

Furthermore, in this embodiment, the case where one computer and one projector establish and participate in the same network has been described, but a plurality of devices may be connected to each other. When establishing a network with three or more devices, one of the devices desired to participate in the network determines a connection SSID and transmits it to another device, for example, via a USB memory.
Further, the device for selecting the connection SSID may be, for example, a device at the farthest position that can be detected by the device attempting to establish the ad hoc network, depending on the range of the ad hoc network.
Furthermore, it is desirable that a device for selecting a connection SSID is set by a device in a range where another device has already established an ad hoc network.

  The present invention relates to a communication device, a communication device connection system, a communication device connection method, and a program for constructing and joining a network between communication devices intended for connection among a plurality of communication devices connected to a wireless communication network. It is effective for.

1, 2, 100, 300 ... computer 3, 4, 200, 400 ... projector 5, 6 ... wireless communication detectable range, 101, 201 ... network, 102, 202 ... Communication control unit 103, 203, 301, 401 ... SSID transmission / reception unit for connection, 104 ... SSID creation unit for connection, 105 ... Ad hoc network creation unit, 106, 204 ... Network detection unit, 107, 206... BSSID creation unit, 108, 207... Network identifier storage unit, 109... Network joining standby unit, 110 network connection device discrimination unit, 205, 303, 403. 209... Device type information issuing unit 302, 402... SSID list creation unit for connection 304, 40 ... connection for the SSID generating unit

Claims (10)

In a communication system that performs wireless communication between a first communication device that constructs a network using network identifier information and a second communication device that joins the network,
The first communication device is:
Network identifier sharing means for transmitting or receiving and sharing network identifier information with the second communication device;
Ad hoc network construction means for configuring an ad hoc network using the shared network identifier information;
Network subscription accepting means for accepting a network subscription from the second communication device having the shared network identifier information for constructing the ad hoc network;
With
The second communication device is:
Network identifier sharing means for receiving or transmitting and sharing network identifier information with the first communication device;
Network receiving means for receiving network information including the network identifier information from a network existing around the second communication device;
Network identifier extracting means for extracting network identifier information from the network information received by the network receiving means;
Network identifier comparing means for comparing the network identifier extracted by the network identifier extracting means with the shared network identifier;
Network joining means for joining a network whose network identifier is determined to be the same as the shared network identifier by the network identifier comparing means;
A communication system for a communication apparatus, comprising: The network identifier information sharing means of the first communication device includes:
Network receiving means for receiving network information including the network identifier information from a network existing around the first communication device;
Network identifier extracting means for extracting network identifier information from the network information received by the network receiving means;
Network identifier generating means for generating a network identifier list;
Network identifier information selecting means for selecting network identifier information from the network identifier information list;
Network identifier comparison means for comparing the network identifier extracted by the network identifier extraction means with the network identifier selected by the network identifier selection means;
As a result of the comparing means, if the selected network identifier is the same as the extracted network identifier, a network identifier selecting means for reselecting a network identifier from the network identifier information list;
A network identifier transmission means for connection for transmitting the selected network identifier to the second communication device,
Means for sharing the network identifier information of the second communication device;
The communication system according to claim 1, further comprising a connection network identifier receiving unit configured to receive the connection network identifier from the first communication device. Means for sharing the network identifier information of the second communication device;
Network identifier information selecting means for selecting network identifier information from the network identifier information list;
Network identifier comparison means for comparing network identifiers extracted by the network identifier extraction means;
As a result of the comparison means, if the extracted network identifier is the same, a network identifier selection means for reselecting a network identifier from the network identifier information list;
A network identifier transmission means for connection that transmits the selected network identifier as a network identifier for connection to the first communication device;
The network identifier information sharing means of the first communication device includes:
The communication system according to claim 1, further comprising a connection network identifier receiving unit configured to receive the connection network identifier from the second communication device. The network identifier list generating means of the first communication device generates a plurality of network identifiers by a predetermined method,
The communication of the communication apparatus according to any one of claims 1 to 3, wherein the network identifier list generation means of the second communication apparatus generates a plurality of the network identifiers by a predetermined method. system. The network identifier list generating means of the first communication device generates a plurality of network identifiers from information generated in advance,
The communication apparatus according to any one of claims 1 to 3, wherein the network identifier list generation unit of the second communication apparatus generates a plurality of the network identifiers from information generated in advance. Communication system. In a communication method for performing wireless communication between a first communication device that constructs a network using network identifier information and a second communication device that joins the network,
A network identifier sharing step in which the second communication device transmits or receives and shares network identifier information with the first communication device;
A network identifier sharing step in which the first communication device receives or transmits network identifier information with the second communication device; and
An ad hoc network construction step in which the first communication device forms an ad hoc network using the shared network identifier information;
A network receiving step in which the second communication device receives network information including the network identification information from a network existing around the second communication device;
A network identifier extracting step in which the second communication device extracts network identifier information from the network information received by the network receiving means;
A network identifier comparison step in which the second communication device compares the network identifier extracted by the network identifier extraction means with the shared network identifier;
A network joining step in which the second communication device joins a network whose network identifier is determined to be the same as the shared network identifier by the network identifier comparing means;
A network subscription accepting step in which the first communication device accepts a network subscription from the second communication device having the shared network identifier information in order to construct the ad hoc network;
A communication method for a communication apparatus, comprising: In a program for a communication device that wirelessly communicates between a first communication device that constructs a network using network identifier information and a second communication device that joins the network,
In the computer of the first communication device,
A network identifier sharing step of receiving or transmitting network identifier information to and sharing with the second communication device;
An ad hoc network construction step for constructing an ad hoc network using the shared network identifier information;
A network subscription acceptance step for accepting a network subscription from the second communication device having the shared network identifier information for the ad hoc network construction;
A program for running In a program for a communication device that wirelessly communicates between a first communication device that constructs a network using network identifier information and a second communication device that joins the network,
In the computer of the second communication device,
A network identifier sharing step of transmitting or receiving and sharing network identifier information with the first communication device;
Receiving a network information including the network identifier information from a network existing around the second communication device; and
A network identifier extracting step for extracting network identifier information from the network information received by the network receiving means;
A network identifier comparison step of comparing the network identifier extracted by the network identifier extraction means with the shared network identifier;
A network joining step of joining a network in which the network identifier is determined to be the same as the shared network identifier by the network identifier comparing means;
A program for running In a communication device that performs wireless communication between a first communication device that constructs a network using network identifier information and a second communication device that joins the network,
Network identifier sharing means for transmitting or receiving and sharing network identifier information with the second communication device;
Ad hoc network construction means for configuring an ad hoc network using the shared network identifier information;
Network subscription accepting means for accepting a network subscription from the second communication device having the shared network identifier information for constructing the ad hoc network;
A communication apparatus comprising: In a communication device that performs wireless communication between a first communication device that constructs a network using network identifier information and a second communication device that joins the network,
Network identifier sharing means for receiving or transmitting and sharing network identifier information with the first communication device;
Network receiving means for receiving network information including network identifier information from a network existing around the second communication device;
Network identifier extracting means for extracting network identifier information from the network information received by the network receiving means;
Network identifier comparing means for comparing the network identifier extracted by the network identifier extracting means with the shared network identifier;
Network joining means for joining a network whose network identifier is determined to be the same as the shared network identifier by the network identifier comparing means;
A communication apparatus comprising:

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