JP2006261850A - Communication apparatus and network buildup method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technology for preventing illegitimate access from a third party in a network built up among communication apparatuses and for preventing a communication speed from being decreased due to an effect from the third party. <P>SOLUTION: The communication apparatus including a function of transmitting a notice signal for concealing a network identifier discriminates whether or not the communication apparatus uses a particular communication apparatus to build up the network in the case of building up the network with the other communication apparatus, and transmits the notice signal for concealing the network identifier when the communication apparatus discriminates that the communication apparatus uses the particular communication apparatus to build up the network. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a communication apparatus having a function of transmitting a notification signal in which a network identifier is concealed and a network construction method thereof.

  Conventionally, a wireless LAN system called “ad hoc mode” in which a plurality of wireless terminal apparatuses perform wireless communication with each other has been provided. In such a wireless LAN system, communication is established between two wireless terminal devices (hereinafter, one is called “Station A” having the role of creator and the other is called “Station B” having the role of Joiner). The station B includes the beacon information including the SSID (Service Set Identifier) as a notification signal, and the station B that has received the beacon information is included in the beacon information. The most common method is to establish communication with the station A using the SSID.

  On the other hand, by concealing the SSID included in the beacon information, there is a station having a “stealth mode function” that can conceal the presence of the station A from the network and only a user who knows the SSID of the station A in advance can connect.

  There is also provided a wireless LAN system called “infrastructure mode” for performing wireless communication between an access point device (hereinafter referred to as “AP”) and a plurality of wireless terminal devices (hereinafter referred to as “STA”). . In this wireless LAN system, as in the above-described ad hoc mode, the STA uses the SSID included in the beacon information by transmitting the beacon information including the SSID to the surrounding area at a constant cycle from the AP as the creator at all times. The most common method is to establish communication with other STAs.

Even in the infrastructure mode, there is an AP having a “stealth mode function” that conceals the SSID included in the above-described beacon information (see, for example, Patent Document 1). This Patent Document 1 discloses that an AP having a stealth function rejects a connection from a STA attempting to connect with a blank SSID.
JP 2004-32133 A

  However, in the conventional wireless LAN system that performs the most general wireless communication that does not use the above-described stealth function, the SSID is disclosed on the network, so that anyone on the network can read the SSID. Therefore, there is a high possibility that an arbitrary third party will gain unauthorized access, which is not preferable in terms of security. In addition, this causes a decrease in the transfer rate of wireless communication.

  Furthermore, even if the stealth function is used, users who have already made a wireless connection already know the SSID, so even if the stealth function is used, they may attempt to participate in a one-to-one connection between wireless terminals. It is possible and it is unavoidable to reduce the transfer speed of wireless communication due to it.

  The present invention has been made in view of the above circumstances, and prevents unauthorized access from a third party in a network constructed between communication devices, and prevents a decrease in communication speed due to the influence of the third party. For the purpose.

  The present invention is a communication apparatus having a function of transmitting a notification signal concealing a network identifier, and whether or not a network is established with a specific communication apparatus when a network is established with another communication apparatus. And a means for transmitting a notification signal concealing the identifier of the network when the determination means determines that a network has been constructed.

  The present invention is also a network construction method for a communication device having a function of transmitting a notification signal concealing a network identifier, and when constructing a network with another communication device, a specific communication device and A determination step for determining whether or not a network has been established; and a step of transmitting a notification signal concealing the identifier of the network when it is determined that the network has been established in the determination step.

  According to the present invention, in a network constructed between communication devices, it is possible to prevent unauthorized access from a third party and to prevent a decrease in communication speed due to the influence of the third party. Become.

  The best mode for carrying out the invention will be described below in detail with reference to the drawings.

[First Embodiment]
FIG. 1 is a diagram illustrating a configuration example of a wireless LAN system according to the first embodiment. In FIG. 1, reference numeral 101 denotes a range in which an ad hoc network can be configured in a wireless LAN system compliant with IEEE 802.11b / a / g. Reference numeral 102 denotes a wireless LAN, a printer, a facsimile, a scanner, or a multifunction system (wireless terminal device having a wireless LAN function) that combines these functions. Further, the wireless terminal device 102 is assumed to have a function as a slave station and a function as a master station (control station), for example.

  In the first embodiment, the wireless terminal device 102 functions as a master station, and wireless terminals indicated by 103, 104, and 105 described later function as slave stations.

  Reference numeral 103 denotes a wireless terminal device such as a digital camera having a wireless LAN function, which transfers a captured image file to the wireless terminal device 102 by wireless connection. A wireless terminal device 104 such as a personal computer having a wireless LAN function transfers a document file to the wireless terminal device 102 by wireless connection, or reads a document file read by the wireless terminal device 102 by wireless connection. Reference numeral 105 denotes a wireless terminal device such as a notebook personal computer having a wireless LAN function.

  In addition, the wireless terminal device 102 previously owns the MAC addresses of the wireless terminal devices 103 and 104 as information on wireless terminals that can be connected to the wireless terminal device 102. In addition, the wireless terminal device 102 always sends a beacon signal including a domain ID (SSID) to all the wireless terminal devices 103, 104, and 105 on the ad hoc network at a constant cycle. In response to this beacon signal, the wireless terminal devices 103, 104, and 105 send a signal including an ID included in the wireless terminal device 103 to the wireless terminal device 102 as a connection request. In this case, connection is permitted only to a wireless terminal device (in this example, wireless terminal devices 103 and 104) whose MAC address and SSID match, and preparation for specific data communication is performed. That is, whether or not to connect is determined based on the match / mismatch of MAC addresses set other than the SSID.

  Here, in the first embodiment, a procedure at the time of connection until a specific data communication channel 106 is established between the wireless terminal device 102 and the wireless terminal device 103 (that is, until a data link is established). This will be described with reference to FIGS.

  FIG. 2 is a diagram illustrating a sequence at the time of connection between wireless terminal devices. FIG. 3 is a flowchart showing processing at the time of connection in the first embodiment. Furthermore, FIG. 4 is a block diagram showing a schematic configuration of the wireless terminal device 102 in the first embodiment. 4 shows only the communication unit of the wireless terminal apparatus 102, it goes without saying that a control unit for controlling the entire apparatus and a plurality of function units for realizing the above-described functions are included. This is the same in other embodiments.

  First, the wireless terminal device 102 as a creator transmits a beacon signal including a domain ID (SSID) to all the wireless terminal devices 103, 104, and 105 on the ad hoc network (201, S301). Next, it waits for reception of a connection request signal from each wireless terminal device that has received this beacon signal (S302). Then, when connection request signals including source terminal identification information (for example, MAC address) are received from the radio terminal devices 103, 104, and 105 (YES in S302), the source terminal identification information is the radio terminal shown in FIG. It is confirmed whether or not it matches information registered in advance in the wireless terminal information storage unit 401 of the device 102 (for example, the MAC addresses of the wireless terminal devices 103 and 104) (S303).

  If the source terminal identification information does not match the wireless terminal information (401) (NO in S303), the connection request is discarded and prepared for the next connection request. If the source terminal information matches the wireless terminal information (401) (YES in S303), a connection request signal is returned from the wireless terminal device 102 to the wireless terminal devices 103 and 104 (S304).

  Next, an authentication sequence process is performed between the wireless terminal apparatus 102 and the wireless terminal apparatuses 103 and 104 (S305). When the authentication sequence is completed, an association process is performed (202, S306 to S309). Here, when a specific data communication channel is established between the wireless terminal devices 103 and 104, the wireless terminal device 102 communicates with the wireless terminal devices 103, 104, and 105 within the range 101 in which an ad hoc network can be configured from the wireless terminal device 102. The beacon signal including the SSID that has been transmitted is switched to the beacon signal not including the SSID, that is, the stealth mode is entered (203, S310). As a result, the existence of the wireless terminal device 102 is hidden from the range 101 in which the ad hoc network can be configured.

  Thereafter, data communication between the wireless terminal device 102 and the wireless terminal devices 103 and 104 becomes possible (S311), and another wireless terminal device (the wireless terminal device 105 in the example shown in FIG. 1) is ad hoc of the wireless terminal device 102. It becomes impossible to join the network.

  Note that the information registered in the wireless terminal information storage unit 401 of the wireless terminal device 102 is stored in a nonvolatile memory in the device and may be arbitrarily rewritten, or written in the ROM at the time of factory shipment. After that, it may be a non-rewritable one.

  According to the first embodiment, in a network constructed between communication devices, participation from a specific communication device can be prevented and security can be improved.

[Second Embodiment]
Next, a second embodiment according to the present invention will be described in detail with reference to the drawings. In the second embodiment, a wireless terminal device (parent device) having a wireless LAN function, such as a printer, a facsimile machine, a scanner, or a multifunction system that combines these functions, is permitted to connect to this. In a wireless LAN system that establishes a specific data communication channel with a wireless terminal device group (slave unit) and performs communication, an arbitrary wireless terminal device in the wireless terminal device group connected to the wireless terminal device Until the number of (slave devices) reaches the number set in advance in the wireless terminal device (master device), the most common method in the prior art is adopted and the SSID is made public on the network. In addition, when the preset number of units is reached, the SSID is converted into stealth so that an arbitrary third party can connect between the wireless terminal device (master unit) and any wireless terminal device (slave unit). The present invention provides a wireless LAN system that makes it difficult to enter a specific data communication channel established in (1).

  Note that the configuration of the wireless LAN system in the second embodiment is the same as that of the first embodiment described with reference to FIG.

  Here, a procedure at the time of connection in the second embodiment until a specific data communication channel is established between the wireless terminal device 102 and the wireless terminal device 103 (that is, until a data link is established) will be described with reference to FIG. This will be described with reference to FIGS.

  FIG. 5 is a flowchart illustrating a connection procedure in the second embodiment. FIG. 6 is a block diagram illustrating a schematic configuration of the wireless terminal device 102 according to the second embodiment.

  First, the wireless terminal device 102 as a creator transmits a beacon signal including a domain ID (SSID) to all the wireless terminal devices 103, 104, and 105 on the ad hoc network (201, S501). Next, it waits for reception of a connection request signal from each wireless terminal device that has received this beacon signal (S502). When each of the connection request signals including the transmission source terminal identification information (for example, MAC address) is received from the wireless terminal devices 103, 104, and 105 (YES in S502), the number of wireless terminal devices that have received the connection request signal is It is determined whether or not the preset number (the number stored in the connected terminal number storage unit 601 shown in FIG. 6) has been reached (S503). If the number set in the storage unit 601 is exceeded, the subsequent connection request is discarded, and the process returns to step S501. If the number set in the storage unit 601 is not exceeded, a connection request signal is returned from the wireless terminal device 102 to the wireless terminal devices 103 and 104 (S504).

  Next, as in the first embodiment, authentication sequence processing is performed between the wireless terminal device 102 and the wireless terminal devices 103 and 104 (S505), and when the authentication sequence is completed, association processing is performed (202). , S506 to S509). Here, when a specific data communication channel is established between the wireless terminal devices 103 and 104, the wireless terminal device 102 communicates with the wireless terminal devices 103, 104, and 105 within the range 101 in which an ad hoc network can be configured from the wireless terminal device 102. The beacon signal including the SSID that has been transmitted is switched to the beacon signal not including the SSID, that is, the stealth mode is entered (203, S510). As a result, the existence of the wireless terminal device 102 is hidden from the range 101 in which the ad hoc network can be configured.

  Thereafter, data communication is possible between the wireless terminal device 102 and the wireless terminal devices 103 and 104 (S511), and another wireless terminal device (wireless terminal device 105 in the example shown in FIG. 1) is ad hoc of the wireless terminal device 102. It becomes impossible to join the network.

  The number preset in the connected terminal number storage unit 601 shown in FIG. 6 may be stored in a non-volatile memory and may be arbitrarily rewritten, or written in ROM at the time of factory shipment, and then rewritten. Anything that can't be done.

  According to the second embodiment, when the number of wireless terminal devices connected to the wireless terminal device reaches a preset number, authentication or subscription that is preparation (security protection means) for receiving a data communication service Since the SSID used in procedures such as these is stealthed, security can be increased.

[Third Embodiment]
Next, a third embodiment according to the present invention will be described in detail with reference to the drawings. In the second embodiment, since the SSID of the wireless LAN system is disclosed on the network up to a preset number, even after making the SSID stealth, there was an arbitrary third party who understood the previous SSID. In this case, the possibility that the arbitrary third party may illegally access the wireless terminal device cannot be denied.

  Therefore, in the third embodiment, after making the SSID stealth, a specific data communication established between the wireless terminal device (master device) and an arbitrary wireless terminal device (slave device) with an SSID different from the previous SSID. Using a channel, the wireless terminal device (base unit) encrypts it, transmits it by unicast, and again uses a different SSID between the wireless terminal device (base unit) and any wireless terminal device (slave unit). Thus, a wireless LAN system is provided that prevents any third party from entering a new specific data communication channel by establishing a new specific data communication channel.

  The configuration of the wireless LAN system in the third embodiment is the same as that of the second embodiment described above, and a description thereof is omitted.

  FIG. 7 is a diagram illustrating a sequence between wireless terminal devices in the third embodiment. In the third embodiment, the wireless terminal device 102 shown in FIG. 1 operates as a creator, and the wireless terminal device 103 that has established a specific data communication channel 106 with the wireless terminal device 102 operates as a joiner.

  FIG. 8 is a flowchart showing processing after data communication is possible in the third embodiment. First, communication channel establishment processing in the second embodiment shown in FIG. 5 is performed (S801), and then, when the wireless terminal device 102 and the wireless terminal device 103 are operating the same application, An SSID different from the SSID used to establish the communication channel 106 is created (S802), and the created SSID is encrypted by using the already established communication channel 106 and unicasted as a wireless terminal device. It transmits to 103 (704, S803).

  Different SSIDs may be created by the application itself or may be preset in the SSID storage unit 901 shown in FIG.

  Then, when the application operating on the wireless terminal device 103 receives the encrypted SSID, it returns information indicating completion of reception to the wireless terminal device 102 (705, S804). Thereafter, the new SSID notified to each other is changed, and a new data communication channel is established between the wireless terminal device 102 and the wireless terminal device 103 using this SSID.

  According to the third embodiment, it is possible to further improve security compared to the second embodiment.

[Fourth Embodiment]
Next, a fourth embodiment according to the present invention will be described in detail with reference to the drawings. In the fourth embodiment, by using different SSIDs in a new specific data communication channel in the stealth mode, it is assumed that only the wireless terminal device (parent device) and the wireless terminal device (child device) can recognize different SSIDs, The present invention provides a highly secure wireless LAN system that does not allow any third party to read the SSID.

  The configuration of the wireless LAN system in the fourth embodiment is the same as that of the third embodiment described above, and the description thereof is omitted.

  A fourth embodiment will be described with reference to FIGS. FIG. 10 is a diagram illustrating a sequence between wireless terminal devices in the fourth embodiment. FIG. 11 is a flowchart showing processing in the fourth embodiment. FIG. 12 is a block diagram illustrating a schematic configuration of the wireless terminal device 102 according to the fourth embodiment.

  As in the third embodiment, after the SSID is stealized and the communication channel establishment process is performed (1001 to 1003, S1101), the wireless terminal device 102 and the wireless terminal device 103 use the same algorithm. Create an SSID that is different from the SSID. Specifically, the SSID to be created acquires information specific to the communication partner from the data received using the communication channel established based on the previous SSID (S1102), and the information and the wireless terminal devices 102 and 103 A new SSID is created (S1104) by combining with preset information (S1103). Then, SSID creation completion notification is performed by unicast (1004, S1105).

  Thereafter, if an SSID creation completion notification is received from the communication partner (1005, S1106), it can be considered that the created SSIDs are shared with each other. And it changes to the new SSID shared mutually, and a new data communication channel is established between the radio | wireless terminal apparatus 102 and the radio | wireless terminal apparatus 103 using this SSID. At this time, information (such as information of the SSID creation unit 1202 shown in FIG. 12) set in advance in the wireless terminal apparatuses 102 and 103 may be information such as the MAC address or IP address of itself.

  In addition, the unique information (1202) acquired from the received data by the wireless terminal apparatus 102 may be a MAC address, an IP address, or the like that is unique to the communication partner. These pieces of information are stored in a nonvolatile memory included in the wireless communication function and can be arbitrarily rewritten.

  According to the fourth embodiment, security can be further improved as compared with the third embodiment.

[Fifth Embodiment]
Next, a fifth embodiment according to the present invention will be described in detail with reference to the drawings. In the fifth embodiment, when a specific data communication channel is established, a communication service is not performed on the established specific data communication channel, an SSID different from the data communication channel is notified, and a wireless terminal device sharing the SSID A new communication network is constructed between the two.

  FIG. 13 is a diagram illustrating a configuration example of a wireless LAN system according to the fifth embodiment. In FIG. 13, reference numeral 1301 denotes a specific data communication channel different from the data communication channel 106. About another structure, it is the same as the structure shown in FIG. 1, The same code | symbol is provided and the description is abbreviate | omitted.

  Here, in the fifth embodiment, the procedure at the time of connection until the specific data communication channel 1301 is established between the wireless terminal device 102 and the wireless terminal device 103 (that is, until the data link is established) is shown in FIG. This will be described with reference to FIGS.

  FIG. 14 is a diagram illustrating a sequence according to the fifth embodiment. FIG. 15 is a flowchart showing processing in the fifth embodiment.

  In the fifth embodiment, as in the first or second embodiment, the wireless terminal device 102 and the wireless terminal device 103 perform association processing using SSID1 (1401, 1402), and the SSID1 is made stealth. Later (1403), similar to the third or fourth embodiment, SSID2 different from SSID1 is shared (1404). Then, the communication channel 106 based on the previous SSID1 is temporarily disconnected (1405), and a new communication channel 1301 is established using SSID2 shared only by both on the network (1406 to 1408).

  It is assumed that the wireless terminal apparatus 102 establishes a new communication channel 1301 using a stealth mode that does not include SSID2 in the transmitted beacon information.

  Here, processing at the time of connection until establishing a new specific data communication channel between the wireless terminal device 102 and the wireless terminal device 103 will be described with reference to FIG.

  FIG. 15 is a flowchart showing processing in the fifth embodiment. First, the wireless terminal device 102 establishes the specific data communication channel 106 (S1501), and transmits the encrypted SSID2 to the wireless terminal device 103 (S1502). Then, the SSID2 reception completion notification is received from the wireless terminal device 103 (S1503), and when the time set in advance in the wireless terminal device 102 has elapsed while sharing SSID2, the communication channel automatically established using SSID1 is established. Disconnect (S1504).

  After that, a beacon that does not include the shared SSID2 is transmitted again in the stealth mode (S1505), and a process of establishing a new communication channel 1301 is executed for the wireless terminal device that has transmitted the connection request signal (1506 to 1509). Do.

  According to the fifth embodiment, the confidentiality of data communicated with the wireless terminal device can be prevented from leaking, and a third party can enter the specific data communication channel established with the wireless terminal device. Can be prevented. As a result, it becomes possible to limit the contents of the service to each communication channel, so that it can be developed into various usage forms.

[Sixth Embodiment]
Next, a sixth embodiment according to the present invention will be described in detail with reference to the drawings. In the sixth embodiment, an arbitrary wireless terminal device in the wireless terminal device group has left the new network formed by the wireless terminal device (master device) and the wireless terminal device group (slave device) using different SSIDs. In this case, that is, when the number of connected devices is less than the preset number, the wireless terminal device cancels the stealth mode and provides a wireless LAN system that releases the original SSID on the network again.

  FIG. 16 is a diagram illustrating a configuration example of a wireless LAN system according to the sixth embodiment. In FIG. 16, reference numeral 1601 denotes an ad hoc network range by the wireless radio terminal apparatus 102, which is the communication channel 106 or the new communication channel 1301 shown in FIG. Reference numeral 1602 denotes a wireless terminal device that is removed from the ad hoc network 1601 in which it participates. Other configurations are the same as those in FIG. 1, and the same reference numerals are given, and the description thereof is omitted.

  FIG. 17 is a diagram illustrating a sequence of the wireless terminal device in the sixth embodiment. As shown in FIG. 17, the wireless terminal device 102 transmits a beacon including SSID1 (1701), performs an association process (1702), steals SSID1 (1703), and enables data communication (1704).

  In this state, when the wireless terminal device 103 leaves the communication channel 1601 in which it participated, the wireless terminal device 102 disconnects the communication channel 1601 (1705). Then, a beacon including SSID1 is transmitted to the wireless terminal device group (1706).

  FIG. 18 is a diagram illustrating another sequence of the wireless terminal device in the sixth embodiment. This sequence is a sequence when the range 1601 of the ad hoc network shown in FIG. 16 is the communication channel 1301 configured with SSID2.

  Here, reference numerals 1801 to 1807 shown in FIG. 18 are the same as 1401 to 1408 shown in FIG.

  As described above, when data communication becomes possible and the wireless terminal device 103 exits the communication channel 1601 in which the wireless terminal device 103 has participated, the wireless terminal device 102 disconnects the communication channel 1601 (1808). Then, a beacon including SSID1 is transmitted to the wireless terminal device group (1809).

  In the sixth embodiment, the case where the wireless terminal device 103 has left the ad hoc network has been described as an example, but needless to say, the case where the wireless terminal device 102 leaves the ad hoc network can be applied.

  According to the sixth embodiment, when the wireless terminal device leaves the ad hoc network, the newly constructed network is disconnected and the original network is reconstructed, so that the wireless terminal device is automatically restored to the original network. It becomes possible to participate.

[Seventh Embodiment]
Next, a seventh embodiment according to the present invention will be described in detail with reference to the drawings. In the seventh embodiment, while a new network is formed by the wireless terminal device (master device) and the wireless terminal device group (slave device), the wireless terminal device (master device) is added to the original network configured with the SSID. ) When a wireless terminal device to which the same IP address is assigned is participating, when the wireless terminal device (master unit) rejoins the original network using the SSID again, the IP address is reassigned. Accordingly, it is an object of the present invention to provide a wireless LAN system capable of avoiding IP address collision and smoothly returning to the original network.

  FIG. 19 is a diagram illustrating a configuration of a wireless LAN system according to the seventh embodiment. In FIG. 19, reference numeral 1901 denotes a wireless terminal apparatus in a state where the data communication channel of SSID2 is disconnected and the beacon of SSID1 is transmitted according to the sixth embodiment. Reference numeral 1902 denotes an SSID1 data communication channel established by the wireless terminal devices 104, 105, and 1903 while the wireless terminal device 1901 establishes an SSID2 data communication channel.

  It is assumed that the wireless terminal device 1903 acquires the same IP address (192.168.0.2) as the wireless terminal device 1901 and participates in the ad hoc network 1902.

  Here, the process of constructing an ad hoc network in the seventh embodiment will be described with reference to FIG.

  FIG. 20 is a diagram illustrating a sequence according to the seventh embodiment. As described in the sixth embodiment, the wireless terminal device 1901 disconnects the ad hoc network (1908) while data communication is possible (1901-1907). When a beacon of the original SSID 1 is transmitted and an attempt is made to return to the original ad hoc network, the wireless terminal device 1903 that functions as a joiner having the same IP address as that of the wireless terminal device 1901 is returned to the return ad hoc network. The wireless terminal device 1901 once clears its own IP address and obtains a new IP address again. At this time, the new IP address may be random, or may be a method of incrementing a certain value from the original IP address or a method of decrementing.

  When a new IP address is acquired, a beacon including the original SSID1 is transmitted to the wireless terminal device groups 104, 105, and 1903 (1909).

  According to the seventh embodiment, it is possible to prevent IP address collision when rejoining the original network.

  Even if the present invention is applied to a system composed of a plurality of devices (for example, a host computer, an interface device, a reader, a printer, etc.), it is applied to an apparatus (for example, a copier, a facsimile machine, etc.) composed of a single device. It may be applied.

  Another object of the present invention is to supply a recording medium that records software program codes for realizing the functions of the above-described embodiments to a system or apparatus, and the computer (CPU or MPU) of the system or apparatus uses the recording medium as a recording medium. Needless to say, this can also be achieved by reading and executing the stored program code.

  In this case, the program code itself read from the recording medium realizes the functions of the above-described embodiment, and the recording medium storing the program code constitutes the present invention.

  As a recording medium for supplying the program code, for example, a floppy (registered trademark) disk, a hard disk, an optical disk, a magneto-optical disk, a CD-ROM, a CD-R, a magnetic tape, a nonvolatile memory card, a ROM, or the like is used. be able to.

  Further, by executing the program code read by the computer, not only the functions of the above-described embodiments are realized, but also an OS (operating system) operating on the computer based on the instruction of the program code. It goes without saying that a case where the function of the above-described embodiment is realized by performing part or all of the actual processing and the processing is included.

  Further, after the program code read from the recording medium is written in a memory provided in a function expansion board inserted into the computer or a function expansion unit connected to the computer, the function expansion is performed based on the instruction of the program code. It goes without saying that the CPU or the like provided in the board or the function expansion unit performs part or all of the actual processing and the functions of the above-described embodiments are realized by the processing.

It is a figure which shows the structural example of the wireless LAN system in 1st Embodiment. It is a figure which shows the sequence at the time of the connection between radio | wireless terminal apparatuses. It is a flowchart which shows the process at the time of the connection in 1st Embodiment. It is a block diagram which shows schematic structure of the radio | wireless terminal apparatus 102 in 1st Embodiment. It is a flowchart which shows the procedure at the time of the connection in 2nd Embodiment. It is a block diagram which shows schematic structure of the radio | wireless terminal apparatus 102 in 2nd Embodiment. It is a figure which shows the sequence between the radio | wireless terminal apparatuses in 3rd Embodiment. It is a flowchart which shows the process after the data communication in 3rd Embodiment is possible. It is a block diagram which shows schematic structure of the radio | wireless terminal apparatus 102 in 3rd Embodiment. It is a figure which shows the sequence between the radio | wireless terminal apparatuses in 4th Embodiment. It is a flowchart which shows the process in 4th Embodiment. It is a block diagram which shows schematic structure of the radio | wireless terminal apparatus 102 in 4th Embodiment. It is a figure which shows the structural example of the wireless LAN system in 5th Embodiment. It is a figure which shows the sequence in 5th Embodiment. It is a flowchart which shows the process in 5th Embodiment. It is a figure which shows the structural example of the wireless LAN system in 6th Embodiment. It is a figure which shows the sequence of the radio | wireless terminal apparatus in 6th Embodiment. It is a figure which shows the other sequence of the radio | wireless terminal apparatus in 6th Embodiment. It is a figure which shows the structure of the wireless LAN system in 7th Embodiment. It is a figure which shows the sequence in 7th Embodiment.

Claims (12)

A communication device having a function of transmitting a notification signal concealing a network identifier,
A determination means for determining whether or not a network is constructed with a specific communication device when constructing a network with another communication device;
And a means for transmitting a notification signal concealing the identifier of the network when the determination means determines that a network has been constructed.   2. The communication apparatus according to claim 1, wherein the determination unit determines whether or not a network has been established with the specific communication apparatus based on information for specifying another communication apparatus.   2. The communication apparatus according to claim 1, wherein the determination unit determines whether or not a network has been established with the specific communication apparatus based on information indicating the number of communication apparatuses that should construct the network.   The communication apparatus according to claim 1, wherein after the notification signal is transmitted, an identifier different from the identifier of the network is encrypted and communicated.   The communication apparatus according to claim 1, wherein after transmitting the notification signal, an identifier different from the identifier of the network is generated and notified with the specific communication apparatus.   The communication apparatus according to claim 1, wherein after transmitting the notification signal, an identifier different from the identifier of the network is shared with the specific communication apparatus.   The communication apparatus according to claim 4, wherein a network constructed with the network identifier is disconnected and a new network is constructed using the different identifier.   8. The communication apparatus according to claim 7, wherein the network constructed using the different identifier is disconnected and joined to the network using the original network identifier.   9. The communication apparatus according to claim 8, wherein information for identifying the communication apparatus is reset when participating in the network. A network construction method for a communication apparatus having a function of transmitting a notification signal concealing a network identifier,
When constructing a network with other communication devices, a determination step of determining whether or not a network is constructed with a specific communication device;
And a step of transmitting a notification signal concealing the identifier of the network when it is determined that the network is established in the determination step.   A program for causing a computer to execute the network construction method for a communication apparatus according to claim 10.   The computer-readable recording medium which recorded the program of Claim 11.

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