JP2015188132A - Communication device, control method, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate vexatious complication of re-connection processing between devices when a radio parameter is changed at one communication device after connection between the devices is performed once.SOLUTION: When a communication device for generating a radio network changes a radio channel it is using, the communication device terminates a generated radio network, generates a new radio network after change of the radio channel, and sends a first other communication device which was participating in the network before the change of the radio channel a signal to invite the first other communication device to the new radio network.

Description

  The present invention relates to radio channel setting in radio communication.

  In recent years, there is an increasing number of cases where a wireless LAN station (terminal) function is mounted on an electronic device such as a digital camera or a printer, and the electronic device is used as a communication device connected to the wireless LAN. Japanese Patent Application Laid-Open No. 2004-228561 describes a method of facilitating image sharing by mounting a wireless LAN function on a digital camera.

  A wireless LAN conforming to the IEEE 802.11 standard series has two modes, an infrastructure mode and an ad hoc mode. In the infrastructure mode, an access point (hereinafter referred to as “AP” or “base station”) manages a wireless network, and a station (hereinafter referred to as “STA” or “child station”) manages the wireless network. Connect to and communicate.

  In addition, Wi-Fi Peer-to-Peer (hereinafter referred to as “P2P”) standards are established by the Wi-Fi Alliance. The P2P standard defines a P2P group, which is a wireless communication network composed of a P2P group owner (hereinafter referred to as “P2P-GO”) and a P2P client (hereinafter referred to as “P2P-CL”). . Within the P2P group, P2P-CL performs communication by connecting to a base station P2P-GO as a slave station.

  The MAC layer of the wireless LAN employs CSMA / CA (Carrier Sense Multiple Access with Collision Aidance). Thus, a plurality of communication devices can communicate using the same radio frequency channel (hereinafter referred to as “radio channel”). In wireless communication such as a wireless LAN, communication cannot be performed if the wireless channel set by the transmission-side device and the reception-side device is different, and between communication devices that communicate with each other, The same radio channel needs to be set. Therefore, the AP generally changes the radio channel only when there is an instruction from the user or when the AP autonomously detects deterioration of the radio wave environment. That is, it is not common for the AP to change the radio channel frequently. On the other hand, when searching for an AP, the STA performs a network search (Scan) while switching channels. For this reason, it can be assumed that the STA frequently changes the channel.

  In addition, the STA function and the P2P-GO function can be operated simultaneously (hereinafter, such an operation is referred to as a “concurrent operation”), and a wireless communication apparatus having such an implementation has been developed. Has been. Hereinafter, such a wireless communication device is referred to as a dual device.

JP 2011-035768 A

  In the dual device, the STA function and the P2P-GO function can communicate with each other using different channels. However, in order to operate the STA function and the P2P-GO function of the dual device on different channels, two pieces of wireless hardware for setting the channels are required. However, if two pieces of wireless hardware are provided, the cost increases accordingly. Therefore, it is practical that the STA function and the P2P-GO function of the dual device use one radio hardware in common and the radio channels used by these functions are the same.

  Therefore, when at least one P2P-CL is connected to a wireless network generated by the dual device using the P2P-GO function, in order to maintain communication with the P2P-CL, the channel of the dual device is changed. Must be suppressed. However, if the channel change is suppressed, the dual device cannot perform network search and wireless connection other than the wireless channel being used. In other words, if the network search and wireless connection other than the wireless channel used by the dual device are performed, the P2P group generated by the P2P-GO function is forced to end.

  The present invention has been made in view of the above problems, and a technique for a communication device to maintain a connection with another communication device participating in a generated wireless network even after changing a wireless channel in use. The purpose is to provide.

  In order to achieve the above object, a communication device according to the present invention includes a generation unit that generates a wireless network, and a termination unit that terminates the wireless network generated by the generation unit when changing a wireless channel used by the communication device. And transmitting means for transmitting a signal to the first other communication device that has joined the wireless network generated by the generating means, and the generating means includes a new one after changing the wireless channel. A wireless network is generated, and the transmission means transmits a signal for inviting to the new wireless network to the first other communication device.

  ADVANTAGE OF THE INVENTION According to this invention, a communication apparatus can maintain the connection with the other communication apparatus which has participated in the produced | generated wireless network, even after changing the radio channel in use.

The figure which shows the structural example of a wireless network. The block diagram which shows the structural example of a communication apparatus. The block diagram which shows the example of a software function structure of a communication apparatus. FIG. 3 is a sequence diagram showing a flow of processing between apparatuses in the first embodiment. FIG. 3 is a first flowchart illustrating a processing flow of the communication apparatus according to the first embodiment. FIG. FIG. 5 is a second flowchart showing a processing flow of the communication apparatus according to the first embodiment. FIG. FIG. 9 is a sequence diagram illustrating a flow of processing between apparatuses according to the second embodiment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Hereinafter, an example using a wireless LAN system compliant with the IEEE 802.11 series will be described.

(Configuration of wireless communication system)
FIG. 1 shows a configuration example of a wireless communication system according to this embodiment. The wireless communication system of FIG. 1 includes a dual device 12, an access point 11 (hereinafter referred to as “AP”), and a peer-to-peer client 13 (hereinafter referred to as “P2P-CL”) which are communication devices. Including. The AP 11 generates and manages the wireless network 14. The dual device 12 has a station (hereinafter referred to as “STA”) function connected to the AP and a peer-to-peer group owner (hereinafter referred to as P2P-GO) function. The dual device 12 participates in the wireless network 14 generated by the AP 11 by the STA function to establish a wireless connection with the AP 11, and generates and manages the wireless network 15 by the P2P-GO function. The P2P-CL 13 participates in the wireless network 15 generated by the dual device 12 and establishes a wireless connection with the dual device 12. Note that the connection between the P2P-GO function of the dual device 12 and the P2P-CL 13 conforms to the Wi-Fi Peer-to-Peer (hereinafter referred to as “P2P”) standard.

  The wireless network 14 and the wireless network 15 are constructed with the same radio frequency (hereinafter referred to as a radio channel), but these networks operate independently. For this reason, the network identifier (hereinafter, SSID), the authentication method, the encryption method, and the like may be different between the wireless network 14 and the wireless network 15. Further, it is assumed that there is a wireless network 17 (not shown) that is generated and managed by the AP 16 (not shown) using a wireless channel different from the wireless network 14 and the wireless network 15. The SSID, authentication method, encryption method, and the like of the wireless network 17 are the same as those of the wireless network 14, and roaming from the wireless network 14 to the wireless network 17 is possible.

(DUAL device configuration)
FIG. 2 shows a configuration example of the dual device 12. In FIG. 2, 201 indicates the entire apparatus, and the dual apparatus 12 includes, for example, a display unit 202, a control unit 203, a storage unit 204, an input unit 205, a radio unit 206, an antenna control unit 207, and an antenna 208.

  The display unit 202 is a functional unit that performs various displays, and can output visually recognizable information such as an LCD or LED, or can output sound such as a speaker. The control unit 203 controls the entire apparatus by executing a control program stored in the storage unit 204. The control unit 203 includes, for example, one or a plurality of processors such as a CPU and an MPU. The storage unit 204 stores a control program executed by the control unit 203. The storage unit 204 is configured by various memories such as a ROM, a RAM, an HDD, and a flash memory, for example. Various operations to be described later are performed by the control unit 203 executing a control program stored in the storage unit 204. The input unit 205 is a functional unit for the user to make various inputs. The input unit 205 receives input from the user and outputs the received operation content to the control unit 203, for example. The wireless unit 206 is a functional unit for performing wireless communication, and the antenna control unit 207 can control at least one of transmission and reception of a wireless signal by controlling the antenna 208. Note that the dual device 12 may have a hardware configuration other than the hardware configuration shown in FIG. For example, the dual device 12 has an imaging unit when it is a digital camera, and has a printing unit when it is a printer.

  FIG. 3 shows an example of a software function configuration obtained by execution by the control unit 203. As illustrated in FIG. 3, the control unit 203 implements, for example, a common control unit 301, a P2P-GO control unit 302, and a STA control unit 303 as software functions. The common control unit 301 controls the wireless unit 206 in common with the P2P-GO function and the STA function. The P2P-GO control unit 302 controls the wireless unit 206 with the P2P-GO function. The STA control unit 303 controls the wireless unit 206 with the STA function.

  The common control unit 301 includes, for example, a packet reception unit 304, a packet transmission unit 305, a channel control unit 306, and a repetition processing unit 307. The packet reception unit 304 has a function of receiving a packet used for communication, and the packet transmission unit 305 has a function of transmitting a packet used for communication. The signal may be transmitted or received in a format other than the packet format. In this case, the packet reception unit 304 and the packet transmission unit 305 can be realized as a function of receiving or transmitting a signal in accordance with the format of the signal to be used. The channel control unit 306 controls a radio channel used for communication. The iterative processing unit 307 repeatedly executes a network search process described later.

  The P2P-GO control unit 302 includes, for example, a network management unit 308, a station detection unit 309, an absence notification processing control unit 310, and an invitation request processing control unit 311. The network management unit 308 generates and manages a wireless network as P2P-GO. The station detection unit 309 detects and determines whether or not at least one P2P-CL is connected to the wireless network generated by the network management unit 308. The absence notification process control unit 310 controls a Notice of Absence (hereinafter referred to as “NoA”) process, which will be described later. The invitation request processing control unit 311 transmits an invitation request (to be described later) to another communication apparatus having peer-to-peer (P2P) capability, thereby requesting an invitation to the wireless network generated by the network management unit 308. Do.

  The STA control unit 303 includes, for example, a network search unit 312 and a network connection control unit 313. The network search unit 312 searches for a wireless network generated by another surrounding communication device. The network connection control unit 313 controls connection to a wireless network generated by another communication device, for example, found by searching. Note that each of the functional blocks illustrated in FIG. 3 is not necessarily provided by software, and may be provided by hardware. Each functional block shown in FIG. 3 has a mutual relationship. Each functional block shown in FIG. 3 is an example, and a plurality of functional blocks in FIG. 3 may be configured as one functional block, or any one of the functional blocks in FIG. It may be divided.

(Process flow)
Subsequently, a flow of processing in the wireless communication system including the above-described dual device 12 will be described. FIG. 4 is a sequence diagram showing an example of the flow of this process.

  First, the AP 11 generates the wireless network 14 with 10 channels (10CH) (F401). The dual device 12 participates in the wireless network 15 generated by the AP 11 by the STA function, and establishes a connection with the AP 11 (F402). Thereafter, the dual device 12 generates the wireless network 15 by the P2P-GO function (F403). At this time, the radio channel used in the radio network 15 generated by the dual device 12 is the same (10 channels) as the radio channel used in the radio network 14 in which the dual device 12 participates. The P2P-CL 13 participates in the wireless network 15 and establishes a connection with the dual device 12 (F404). Here, in the connection between the dual device 12 (its P2P-GO function) and the P2P-CL13, a P2P Group Formation process or a P2P Invitation process defined in the P2P standard may be used.

  Thereafter, the wireless communication between the dual device 12 and the AP 11 (wireless network 14) is disconnected due to the movement of the dual device 12 and leaving the communicable range of the wireless network 14 or the suspension of the AP 11. (F405). Then, the dual device 12 checks whether or not there is a P2P-CL participating in the wireless network 15 generated as P2P-GO (F406). When the dual device 12 confirms that the P2P-CL 13 exists in the wireless network 15, the dual device 12 performs processing to notify the P2P-CL 13 of a schedule in which the P2P-GO of the dual device 12 is absent in the wireless network 15 (F407). . This process is hereinafter referred to as NoA process. The DUAL device 12 prevents the P2P-CL 13 from leaving the wireless network 15 by not being able to communicate with the P2P-GO by notifying the P2P-CL 13 using the NoA process, thereby preventing the P2P-CL 13 from leaving the wireless network 15. You can continue the group.

  Then, the dual device 12 changes the wireless channel to be used to one channel based on the schedule notified in the NoA process (F408). When the change of the wireless channel is completed, the dual device 12 transmits a wireless network search request (for example, Probe Request) using one channel (F409). Here, in one channel, it is assumed that there is no AP having an SSID related to the wireless network to which the dual device 12 should be connected. Then, since there is no wireless network to be connected, the dual device 12 does not connect to the wireless network using one channel. Thereafter, the dual device 12 finishes changing the radio channel to 1 channel and returns to 10 channel. Thereafter, the dual device 12 repeats the search for the wireless network while changing the wireless channel to be used (search target) for the wireless networks after the second channel in the same manner as the wireless network search for one channel (F410 to F415). .

  Here, it is assumed that the AP 16 having the SSID related to the wireless network to which the dual device 12 is connected has generated the wireless network 17 using three channels (F416). Then, the DUAL device 12 receives the wireless network search response from the AP 16 having the SSID related to the wireless network to be connected in the three channels while repeating the wireless network search (F417). Thereby, the dual device 12 discovers the wireless network 17 generated by the AP 16.

  The dual device 12 returns to the channel 10 when the wireless network search in the three channels is completed, and terminates the wireless network 15 before connecting to the wireless network 17 in the three channels. That is, the dual device 12 disconnects the connection with the P2P-CL13 (F418). Thereafter, the dual device 12 changes the wireless channel to be used to 3 channels, participates in the wireless network 17 and establishes a connection with the AP 16 (F419). Thereafter, the dual device 12 constructs the wireless network 18 by the P2P-GO function (F420). Here, the radio channels used in the radio network 18 are three channels, similarly to the radio channels used in the radio network 17 in which the dual device 12 participates by the STA function. At this time, the SSID, packet encryption, or decryption password used in the wireless network 18 may be different from the SSID, packet encryption, or decryption password used in the wireless network 15, respectively. When the generation of the wireless network 18 is completed, the dual device 12 transmits a P2P Invitation Request to the P2P-CL 13 that has joined the wireless network 15, and performs an invitation request process (F421). Upon receiving the invitation request, the P2P-CL 13 performs a P2P invitation process and completes the process of joining the wireless network 18 (establishing a connection with the dual device 12) (F422).

  After F406, if the dual device 12 searches for wireless networks in all available wireless channels and finds no wireless network to be connected, the dual device 12 does not disconnect the wireless network 15 and disconnects the P2P-CL13. Continue the connection.

  In the present embodiment, the dual device 12 changes the radio channel and discovers a new radio network by the STA function (F417), and then terminates the radio network 15 generated by the P2P-GO function (F418). However, the dual device 12 may terminate the wireless network 15 at the timing when the disconnection of the wireless network 14 is detected (F405). In that case, the confirmation (F406) whether the P2P-CL exists in the wireless network 15 constructed by the P2P-GO function and the NoA processing (F407, F410, F413) become unnecessary. In this case, the dual device 12 establishes the connection to the wireless network to be connected or completes the search in all the wireless channels without finding the wireless network to be connected, and then performs the wireless network using the P2P-GO function. 18 is generated (F420). Then, the dual device 12 performs a P2P-CL13 invitation request process for this wireless network 18 (F421, F422).

  Subsequently, processing executed by the dual device 12 will be described with reference to FIGS. 5 and 6. 5 and 6 are flowcharts showing the flow of processing executed by the dual device 12. Each step shown in FIGS. 5 and 6 is processed by the control unit 203 of the DUAL device 12 executing a control program stored in the storage unit 204, for example.

  When roaming occurs in the STA function of the dual device 12 during the concurrent operation, the dual device 12 checks whether at least one P2P-CL exists in the wireless network generated by the P2P-GO function of the own device. (S501). The confirmed result is stored as a P2P-CL flag. That is, the P2P-CL flag is set to ON (S502) when P2P-CL exists (YES in S501) and OFF (S503) when it does not exist (NO in S501).

  If the P2P-CL flag is ON (YES in S504), the DUAL device 12 performs NoA processing (S505), and changes the wireless channel to be used to a channel that transmits a wireless network search request (for example, Probe Request). (S506). On the other hand, when the P2P-CL flag is OFF (NO in S504), the DUAL device 12 changes the wireless channel to be used to a channel for transmitting a wireless network search request without performing the NoA process (S506). .

  After the change of the radio channel is completed, the dual device 12 transmits a search request for a radio network using the radio channel after the change (S507). When the transmission is completed, the dual device 12 waits until a wireless network search response (for example, Probe Response) is received for a predetermined time (S508). After the reception waiting time ends, the dual device 12 returns the radio channel to be used to the original channel (S509). After the change of the wireless channel to the original channel is completed, the dual device 12 confirms whether there is a wireless network to be connected to the searched wireless channel based on the result of the received wireless network search response. (S510). If there is a wireless network to be connected as a result of the confirmation (YES in S510), the dual device 12 ends the process of FIG. On the other hand, if there is no wireless network to be connected (NO in S510), the dual device 12 determines whether or not the wireless network has been searched in all available wireless channels (S511). If the dual device 12 determines that the search has been completed for all the wireless channels (YES in S511), the processing of FIG. On the other hand, if the search has not been completed for all the radio channels (NO in S511), the DUAL device 12 changes the radio channel to be searched and returns the process to S504.

  Next, the flow of processing when the dual device 12 changes the channel used in the STA function will be described with reference to FIG.

  When the channel to be used is changed in the STA function of the dual device 12 during the concurrent operation, the dual device 12 terminates the wireless network generated by the P2P-GO function (S601). The dual device 12 then changes the wireless channel used by the device itself (S602), and participates in the wireless network to be connected obtained by the search by the STA function (S603). The DUAL device 12 joins a new wireless network using the STA function, and then generates a new wireless network using the P2P-GO function using the same wireless channel (S604). When the generation of the wireless network is completed, the dual device 12 transmits a P2P Invitation Request to the P2P-CL connected to the wireless network terminated in S601, and performs an invitation request process (S605). After the transmission is completed, the dual device 12 waits until receiving a response to the P2P Invitation Request for a predetermined time (S606). Then, when the dual device 12 receives the response corresponding to the invitation request, the P2P-CL participates in the newly generated wireless network, and the wireless connection between the dual device 12 and the P2P-CL is established. Is done.

  As described above, according to the first embodiment, the P2P group can be continued even if a search of a wireless network or a change of a wireless channel occurs due to roaming in a dual device during a concurrent operation.

<< Embodiment 2 >>
In the first embodiment, the example in which the dual device 12 switches the wireless channel to be used when the connection by the STA function is disconnected has been described. In the present embodiment, an example will be described in which the dual device 12 switches the wireless channel in accordance with, for example, an instruction from the AP 11 or based on its own determination. In addition, since the structure of the radio | wireless communications system in this embodiment and the structure of a communication apparatus are the same as that of Embodiment 1, it abbreviate | omits about the detailed description.

  A processing flow according to the present embodiment will be described with reference to FIG. In the present embodiment, the dual device 12 that is performing a concurrent operation receives a channel change notification defined by the DFS (Dynamic Frequency Selection) function of IEEE802.11h from the AP connected by the STA function. Upon receiving this change notification, the dual device changes the radio channel to be used and continues the P2P group.

  The processing from F701 to F704 is the same as that from F401 to F404 in FIG. That is, the dual device 12 participates in the wireless network 14 generated by the AP 11 by the STA function and establishes a connection with the AP 11, generates the wireless network 15 by the P2P-GO function, and the P2P-CL 13 Join the wireless network. In the wireless network 14 and the wireless network 15, 52 channels are used.

  For example, the AP 11 detects radar from a satellite in a channel in which the wireless network 14 is generated, determines to shift to 36 channel, and transmits a channel change notification to the STA of the DUAL device 12 (F705). Here, the channel change notification includes the change destination radio channel and the change timing. In this example, 36 channels are designated as the change destination radio channel. As the channel change notification, the Channel Switch frame format of Action Frame defined in 802.11 may be used. Further, the channel change notification may be made by adding a Channel Switch Annunciation element to the Beacon or Probe Response.

  Upon receiving the wireless channel change notification, the dual device 12 checks whether there is a P2P-CL participating in the wireless network 15 (F706). When the dual device 12 confirms that P2P-CL participating in the wireless network 15 exists, the dual device 12 terminates the wireless network 15 and disconnects the connection with the P2P-CL 13 before shifting to channel 36 (F707). ). On the other hand, when the AP 11 transmits the wireless channel change notification, the AP 11 changes the wireless channel to be used to 36 channel and generates the wireless network 17 (F708). Then, the dual device 12 changes the wireless channel to be used to 36 channel and participates in the wireless network 17 (F709). Thereafter, the dual device 12 generates the wireless network 18 by the P2P-GO function (F710), and executes an invitation request process for the P2P-CL13 that has joined the wireless network 15 (F711). When this invitation request process ends, the P2P-CL 13 can participate in the wireless network 18 and can establish a wireless connection with the dual device 12 (F712).

  As described above, in the present embodiment, the dual device that is performing the concurrent operation continues the P2P group even if the wireless channel is changed in response to receiving the wireless channel change notification from the AP connected by the STA. It becomes possible to do.

  In the present embodiment, the AP 11 detects the radar, but the radar detection can also be performed by the P2P-GO function of the dual device 12. In this case, when the dual device 12 detects the radar by the P2P-GO function, the dual device 12 decides to change the wireless channel to be used, and transmits a wireless channel change notification designating the switching destination wireless channel to the AP 11. Good. When the AP 11 changes the wireless channel according to the change notification to form a wireless network, the DUAL device 12 participates in the wireless network. Note that the DUAL device 12 terminates the wireless network generated by the P2P-GO function before changing the wireless channel before joining the new wireless network. Then, after joining the new wireless network, the dual device 12 generates a wireless network by the P2P-GO function using the wireless channel specified by the change notification. Note that the dual device 12 may notify the AP 11 only that the radio channel should be switched, and may receive the changed radio channel information from the AP 11 as a response to the notification. In this case, after joining the new wireless network, the dual device 12 generates a wireless network by the P2P-GO function using the wireless channel specified by the received wireless channel information.

<< Other Embodiments >>
The present invention can also be realized by executing the following processing. That is, software (program) that realizes the functions of the above-described embodiments is supplied to a system or apparatus via a network or various storage media, and a computer (or CPU, MPU, or the like) of the system or apparatus reads the program. It is a process to be executed.

12: Dual device (communication device) 302: P2P-GO control unit 303: STA control unit

Claims (16)

A communication device,
Generating means for generating a wireless network;
Ending means for ending the wireless network generated by the generating means when changing the wireless channel used by the communication device;
Transmitting means for transmitting a signal to a first other communication device that has joined the wireless network for which the ending means has ended;
Have
The generating means generates a new wireless network after changing the wireless channel,
The transmission means transmits a signal for inviting to the new wireless network to the first other communication device;
A communication device. A determination means for determining whether or not there is a first other communication device participating in the wireless network when changing a wireless channel used by the communication device;
The termination means terminates the wireless network generated by the generation means when the determination means determines that the first other communication device exists.
The communication apparatus according to claim 1. A joining means for joining the wireless network generated by the second other communication device;
The same wireless channel is used in the wireless network that is joined by the joining means and the wireless network that is created by the creating means.
The communication apparatus according to claim 1 or 2, wherein When a connection with the second other communication device is disconnected, a wireless network to be joined is searched for in a wireless channel different from the wireless channel used for the connection with the second other communication device. And a search means for
The participation means participates in a wireless network to be found that is found by the search means,
The generation means generates the new wireless network using a wireless channel used in the wireless network to be joined that the search means has discovered.
The communication apparatus according to claim 3. The termination means terminates the wireless network generated by the generation means after the search means has found a wireless network to join,
The generation unit generates the new wireless network after the participation unit has joined the wireless network to be joined.
The communication apparatus according to claim 4. When the search means searches for a wireless network to which the search means should participate, the transmission means sends a signal indicating that the communication apparatus no longer exists in the wireless network generated by the generation means to the first other communication apparatus Send to
The communication apparatus according to claim 5. The termination unit is configured to change the wireless network generated by the generation unit after the connection with the second other communication device is disconnected and before the search unit starts searching for a wireless network to join. Exit
The generation means generates the new wireless network after the participation means has joined the wireless network to be found discovered by the search means.
The communication apparatus according to claim 4. The search means searches for a wireless network to join by transmitting a Probe Request in the wireless channel different from the wireless channel used for connection with the second other communication device.
The communication device according to claim 4, wherein the communication device is a device. Receiving means for receiving a radio channel change notification from the second other communication device;
The termination means terminates the wireless network generated by the generation means in response to the change notification being received,
The participation means participates in a wireless network generated by the second other communication device on a wireless channel specified by the change notification,
The generating means generates the new wireless network using the wireless channel specified in the change notification.
The communication apparatus according to claim 3. The transmission means transmits a radio channel change notification to the second other communication device,
The termination means terminates the wireless network generated by the generation means in response to the change notification being transmitted,
The participation means joins the wireless network generated by the second other communication device when the second other communication device generates a wireless network on the wireless channel specified in the change notification,
The generating means generates the new wireless network using a wireless channel designated by the change notification.
The communication apparatus according to claim 3. The generating means generates the new wireless network after the joining means has joined the wireless network generated by the second other communication device using the wireless channel specified in the change notification.
The communication apparatus according to claim 10 or 11, characterized in that The generation means generates a wireless network as a Wi-Fi Peer-to-Peer Group Owner.
The communication device according to claim 1, wherein the communication device is a device. The first other communication device is a communication device that participates in the wireless network generated by the generation unit as a Wi-Fi Peer-to-Peer Client.
The communication device according to claim 12. The signal to invite to the new wireless network is Wi-Fi Peer-to-Peer Invitation Request.
The communication apparatus according to claim 12 or 13, characterized by the above. A method for controlling a communication apparatus having a generating means for generating a wireless network,
An ending step of ending the wireless network generated by the generating unit when the wireless channel used by the communication device is changed;
The generating means for generating a new wireless network after changing the wireless channel; and
A transmission step of transmitting a signal for inviting to the new wireless network to the first other communication device participating in the wireless network before changing the wireless channel;
A control method characterized by comprising: In a computer provided in a communication device having a generation means for generating a wireless network,
An end step of ending the wireless network generated by the generating means when changing the wireless channel used by the communication device;
Controlling the generating means to generate a new wireless network after changing the wireless channel;
Controlling the transmission means to transmit a signal for inviting to the new wireless network to the first other communication device participating in the wireless network before changing the wireless channel;
A program for running

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