JP2014030215A - Communication device, method for controlling communication device, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform setting processing of communication parameters even when a plurality of providing devices for the communication parameters exists.SOLUTION: When a plurality of providing devices for communication parameters exists, the number of the providing devices is set to be in a single. For example, providing processing by all the providing devices is once stopped. Or, a user is caused to select one providing device. Or, one providing device is determined on the basis of a specified rule.

Description

  The present invention relates to a communication device, a communication device control method, and a program.

  In wireless communication represented by a wireless LAN compliant with the IEEE 802.11 standard series, there are many setting items that must be set before use.

  For example, as setting items, there are communication parameters necessary for wireless communication such as an SSID (Service Set Identifier) as a network identifier, an encryption method, an encryption key, an authentication method, and an authentication key. It is very complicated for the user to set all of these manually. Therefore, various manufacturers have devised automatic setting methods for easily setting communication parameters in wireless devices. In these automatic setting methods, communication parameters are automatically set by providing communication parameters from one device to the other device according to a predetermined procedure and message between connected devices.

  Non-Patent Document 1 discloses Wi-Fi Protected Setup (hereinafter, WPS), which is an industry standard for automatically setting communication parameters between an access point (base station) and a station (terminal station). WPS includes a push button method in which buttons are pressed by both devices, and a PIN method in which a predetermined PIN code is set in both devices and communication parameters are set between devices having the same PIN code.

Wi-Fi CERTIFIED (TM) for Wi-Fi Protected Setup: Easing the User Expert for Home and Small Office Wi-Fi (R) Networks, http: // www. wi-fi. org / wp / wif i-protected-setup

  In WPS, since the roles of a device that provides communication parameters (hereinafter, a providing device) and a device that receives (hereinafter, a receiving device) are determined in advance, the transfer direction of the communication parameters is also uniquely determined.

  When there are a plurality of providing devices, it is unclear which receiving device the receiving device should receive the communication parameters from. In such a case, in the WPS push button method, a receiving apparatus that detects a plurality of providing apparatuses performs an operation of terminating the WPS process. In the WPS PIN method, handshaking with the providing device is performed in the order of detection, and WPS processing is performed with the providing device having the same PIN. Therefore, in an environment where there are a plurality of providing devices, the communication parameter automatic setting process by the push button method is impossible, and there is a problem that the required time is required even by the PIN method. In WPS, automatic setting of communication parameters is not determined in the ad hoc mode.

  When multiple providing devices exist in different wireless LAN channels, candidates can be narrowed down by limiting the wireless LAN channels that can be used by the receiving device. However, if the providing devices exist in the same channel, narrowing down is possible. Is difficult. Therefore, even if the wireless LAN channel is limited, a providing device that performs the providing process cannot be determined, and communication parameters cannot be automatically set.

  Therefore, an object of the present invention is to enable communication parameter setting processing even when a plurality of communication parameter providing apparatuses exist.

  In order to achieve the above object, a communication device according to the present invention searches for a communication parameter providing device and selects a providing device from which communication parameters are received when a plurality of providing devices are detected. Process.

  The communication device according to another aspect of the present invention searches for a providing device for providing a communication parameter to a receiving device, and detects the providing device, and detects the providing device based on a predetermined rule. A process of determining a providing device that provides communication parameters to the receiving device is performed from the providing device.

  According to the present invention, when there are a plurality of providing devices, the possibility that the communication parameter automatic setting process will fail can be reduced.

Block diagram of the device Software function block diagram in the device Network configuration diagram Network configuration diagram Operation sequence diagram of apparatus A, apparatus B and apparatus C Operation sequence diagram of apparatus A, apparatus B and apparatus C Operation sequence diagram of apparatus A, apparatus B and apparatus C Operation sequence diagram of apparatus A, apparatus B and apparatus C Operation flowchart of communication device

<Embodiment 1>
Hereinafter, the communication apparatus according to the present embodiment will be described in detail with reference to the drawings. In the following, an example using a wireless LAN system compliant with the IEEE 802.11 series will be described, but the communication form is not necessarily limited to the wireless LAN compliant with IEEE 802.11.

  A hardware configuration in a case suitable for the present embodiment will be described.

  FIG. 1 is a block diagram illustrating an example of the configuration of each device described below. Reference numeral 101 denotes the entire apparatus. A control unit 102 controls the entire apparatus by executing a control program stored in the storage unit 103. The control unit 102 also performs communication parameter setting control with other devices. A storage unit 103 stores a control program executed by the control unit 102 and various types of information such as communication parameters. Various operations described later are performed by the control unit 102 executing a control program stored in the storage unit 103.

  A wireless unit 104 performs wireless LAN communication conforming to the IEEE802.11 series. Reference numeral 105 denotes a display unit that performs various displays, and has a function capable of outputting visually recognizable information such as an LCD or LED, or outputting sound such as a speaker.

Reference numeral 106 denotes a setting button for giving a trigger for starting communication parameter automatic setting processing.
When the setting button 106 is operated, communication parameter automatic setting processing is started. When the control unit 102 detects an operation of the setting button 106 by the user, the control unit 102 performs processing described later.

  Reference numeral 107 denotes an antenna control unit, and 108 denotes an antenna. Reference numeral 109 denotes an input unit for the user to perform various inputs. Reference numeral 110 denotes a functional unit. When the device 101 is a digital camera, the function unit 110 is a photographing unit. Similarly, when the apparatus 101 is a printer, the function unit 110 is a printing unit, and when the apparatus 101 is a mobile phone, the function unit 110 is a call unit or a public wireless unit. The function unit 110 has various functions depending on the type of the device 101. Note that the setting button 106 may be a dedicated button, but may also be used as another button. For example, when the device 101 is a camera, it may also be used as a shutter button, a SET button for various settings, or the like. In the case of a printer, it may also be used as a reset button, a SET button for various settings, or the like.

  FIG. 2 is a block diagram showing an example of the configuration of software function blocks that execute communication parameter automatic setting operations described later. A configuration corresponding to the functional unit in FIG. 1 is omitted.

  Reference numeral 201 denotes the entire apparatus. Reference numeral 202 denotes a communication parameter automatic setting function block. In the present embodiment, communication parameters necessary for wireless LAN communication such as an SSID as a network identifier, an encryption method, an encryption key, an authentication method, and an authentication key are automatically set. In the following, automatic setting of communication parameters is simplified as automatic setting.

  A packet receiving unit 203 receives packets related to various types of communication. Reception of the beacon (notification signal) is performed by the packet receiving unit 203. A packet transmission unit 204 transmits packets related to various types of communication. The beacon is transmitted by the packet transmission unit 204. Various information about the transmission source device is added to the beacon.

  A search signal transmission unit 205 controls transmission of a device search signal such as a probe request. The probe request can also be referred to as a network search signal for searching for a desired network. Transmission of the probe request is performed by the search signal transmission unit 205. Further, the search signal transmission unit 205 also transmits a probe response that is a response signal to the received probe request. In the present embodiment, when the user operates the setting button 106 and starts the automatic setting process, information indicating that the beacon, probe request, and probe response are being automatically set (automatic setting operation is in progress) (IE: Information) Element) is added and transmitted.

  A search signal receiving unit 206 controls reception of a device search signal such as a probe request from another device. The search signal reception unit 206 receives the probe request. The search signal receiving unit 206 also receives a probe response. Various information of the transmission source device is added to the device search signal and the response signal.

  A network control unit 207 controls network connection. The connection processing to the wireless LAN ad hoc network is performed by the network control unit 207.

  In the automatic setting function block 202, 208 is a communication parameter receiving unit that receives (accepts) communication parameters from the partner device, and 209 is a communication parameter providing unit that provides communication parameters to the partner device. An automatic setting control unit 210 controls various protocols in automatic setting. The automatic setting process described later is performed by the communication parameter receiving unit 208 and the communication parameter providing unit 209 based on the control of the automatic setting control unit 210.

  The automatic setting control unit 210 also determines whether or not the elapsed time from the start of the automatic setting process has exceeded the time limit for the setting process. If it is determined that the time limit has been exceeded, the automatic setting process is stopped under the control of the automatic setting control unit 210.

  Reference numeral 211 denotes a provider detection unit that detects a device that provides communication parameters (hereinafter, a providing device). The providing source detection unit 211 detects a providing device based on the transmission and response of the search signal by the search signal transmission unit 205 and the search signal reception unit 206. Further, the providing source detecting unit 211 can also detect the providing device by receiving the beacon by the packet receiving unit 203. When receiving communication parameters, the detected providing device is requested to provide communication parameters, and the communication parameters are provided. In the following description, a device that receives communication parameters is called a receiving device.

  A communication parameter storage unit 212 stores communication parameters provided from the providing device or communication parameters provided to the receiving device. The communication parameter storage unit 212 corresponds to the storage unit 103. In this embodiment, when communication parameters are provided from another device, the communication parameters are stored in the storage unit 103 as set parameters. Further, when the communication parameter is provided to another apparatus, the communication parameter is stored in the storage unit 212 as a set parameter. The set parameters stored in the storage unit 103 may be discarded when communication over a network configured using the set parameters is completed. Alternatively, the information may be discarded when the apparatus is turned off after a predetermined time has elapsed since it was stored in the storage unit 103.

  Reference numeral 213 denotes a beacon control unit that controls the transmission timing of a beacon (notification signal). Reference numeral 214 denotes a beacon generation unit that generates a beacon. The generated beacon is transmitted to the network by the packet transmission unit 204.

  All the functional blocks have a mutual relationship in terms of software or hardware. Further, the functional block is an example, and a plurality of functional blocks may constitute one functional block, or any functional block may be further divided into blocks that perform a plurality of functions.

  3 shows a communication device A32 (hereinafter referred to as device A), a communication device B33 (hereinafter referred to as device B), a communication device C35 (hereinafter referred to as device C), a communication device D36 (hereinafter referred to as device D), and a communication device E37 (hereinafter referred to as “device”). FIG. 2 is a diagram illustrating an apparatus E), an ad hoc network A31 (hereinafter, network A), and an ad hoc network B34 (hereinafter, network B). These communication apparatuses have the configurations shown in FIGS. 1 and 2 described above.

  It is assumed that the device A and the device D have already performed the automatic setting process between the two devices, and the network A is constructed using the communication parameter A shared between the devices A and D. In the automatic setting process performed between the devices A and D, it is assumed that the device A operates as a providing device and the device D operates as a receiving device.

  Similarly, apparatus B and apparatus E have already been subjected to automatic setting processing between the two apparatuses, and network B is constructed using communication parameter B shared between apparatuses B and E. . In the automatic setting process performed between the devices B and E, it is assumed that the device B operates as a providing device and the device E operates as a receiving device.

  Here, the network A and the network B are different networks. Regardless of whether the wireless LAN channel is the same or different from the different network, when the BSSID (Basic Service Set Identifier) that is the network identifier is different, the BSSID is the same, but the wireless LAN channel is different. The wireless LAN channel is a frequency channel.

  In this embodiment, in order to make apparatus C participate in network A, when trying to perform automatic setting between apparatus A and apparatus C participating in network A, A case will be described where the device B that has been activated has also started automatic setting.

  FIG. 5 is a diagram illustrating an example of a processing sequence when the setting button 106 is pressed in the devices A, B, and C and an automatic setting process is performed between the devices.

  The device A has already established the network A with the device D using the communication parameter A set by the automatic setting process performed with the device D (F501). The device B has already established the network B with the device E using the communication parameter B set by the automatic setting process performed with the device E (F509).

  When the setting button 106 is pressed in each device, the device A confirms that it is participating in the network (F502). Since the device A is participating in the network, the device A sets its role to the providing device (F503). After that, the providing apparatus existing in the same wireless LAN channel (wireless LAN channel of network A) is searched (F504). In order to search for a providing device, a search signal (probe request) is transmitted to the same wireless LAN channel (F505).

  The device B performs the same operation as the device A. That is, it confirms that it is participating in the network (F510). Since the device B has already joined the network, the device B sets its role to the providing device (F511). Then, the providing device existing in the same wireless LAN channel (wireless LAN channel of network B) is searched (F512). In order to search for a providing device, a search signal is transmitted to the same wireless LAN channel (F513).

  On the other hand, since the device C does not participate in the network, the network search process is performed for a plurality of wireless LAN channels (F506). The wireless LAN channel to be searched may be all of the supported wireless LAN channels or a plurality of channels designated in advance by the user. Apparatus C transmits a search signal to each channel (F507, F514). The search signal includes an information element indicating that it has an automatic setting function or that automatic setting processing is being performed.

  When device C performs a search on a channel in which network A exists, device A transmits a search response signal to device C (F508). When device C performs a search on a channel in which network B exists, device B transmits a search response signal to device C (F515). Similar to the search signal, the search response signal includes an information element indicating that it has an automatic setting function or that an automatic setting process is being performed. At this time, since the devices A and B have determined their role as the providing device, the devices A and B transmit the search response signal including the information element indicating “providing device”. Here, in addition to the information element indicating “providing device” as a role, an information element indicating that communication parameters can be provided may be added.

  As a result, device C detects that two providing devices, device A and device B, are present in the vicinity. The device C, which has detected that there are two providing devices in the vicinity, displays a message for causing the user to select which of the providing devices A and B the communication parameter automatic setting process is to be performed on. 105. Then, by a user operation on the input unit 109, the device C selects which of the device A and the device B is to perform the communication parameter automatic setting process (F516).

  After performing the selection process, the device C assumes its role as a receiving device (F517). In the selection process F516, when it is determined that the communication parameter automatic setting process is performed with the device A, the device C participates in the network A (F518). Then, the communication messages (protocol messages) exchanged in the communication parameter automatic setting protocol process are mutually transmitted and received between the devices A and C. Note that when the device C joins the network A in F518, since communication parameters such as an encryption key and an authentication key are not set in the device C, the device C normally uses encryption and authentication with the device A. Data communication cannot be performed.

Here, the automatic setting protocol processing refers to processing for transmitting / receiving various communication messages determined in advance to provide communication parameters from the providing device to the receiving device. In WPS, the above protocol processing is called a registration protocol. In this embodiment, in order to simplify the description, the following procedures 1 to 3 will be described as automatic setting protocol processing.
1. A message indicating the start of communication parameter setting (message requesting provision of communication parameters) is transmitted from the receiving device to the providing device.
2. In response to the message, the providing device performs communication parameter providing processing for the receiving device.
3. When the communication parameter provision is completed, a communication parameter setting completion message is transmitted from the providing apparatus to the receiving apparatus.

  When the device C participates in the network A, the device C transmits a message indicating the start of communication parameter setting to the device A (F519). In response to the message, the communication parameter A is provided from the device A to the device C (F520). When the provision processing is completed, the device A transmits a communication parameter setting completion message to the device C. (F521). Thereby, the communication parameter setting process is completed, and the communication parameter A is shared between the devices A and C.

  Then, apparatus A and apparatus C perform communication connection processing using the shared communication parameter A (F522). When the communication parameter setting process is completed, the communication connection process is automatically started, so that the apparatuses A and C can communicate without forcing the user to perform an operation.

  In addition, although the case where the apparatus A was selected in the selection process F516 has been described, when the user selects the apparatus B in F516, the description of F516 to F522 is performed between the apparatus B and the apparatus C. Needless to say.

  As described above, when a plurality of providing apparatuses are detected, a message for allowing the user to select the providing apparatus is displayed, and the providing apparatus and the communication parameter automatic setting process are selected by the user operation. However, there are cases where the user interface of the communication device is poor and an arbitrary one cannot be selected from a plurality of providing devices.

  FIG. 6 is an example of a sequence when the user interface of the communication apparatus is poor. F601 to F615 are the same as F501 to F515 in FIG.

  From the search response signal (F608) from the device A and the search response signal (F615) from the device B, the device C detects that the two providing devices of the device A and the device B exist in the vicinity (F616). . Since the device C has a poor user interface, it cannot be determined from which providing device the communication parameter should be received. Therefore, an instruction signal including an instruction to end the processing as the providing apparatus is transmitted to apparatuses A and B (F617, F618). In apparatus A and apparatus B that have received the instruction signal, the communication parameter automatic setting process ends (F619, F621). In addition, when the device C transmits the instruction signal, the communication parameter automatic setting process is ended (F620). At this time, the devices A, B, and C display an error display indicating that the communication parameter automatic setting process has ended on the display unit 105 and notify the user (F622, F623, and F624). As described above, when the receiving device that is to receive the communication parameters from the providing device detects a plurality of providing devices, the communication parameter setting process in all the devices is once ended. Then, the user who has recognized that the automatic setting process has been completed is again caused to start the communication parameter setting process. In this case, since there is a low probability that both the device A and the device B activate the automatic setting again, the device C is highly likely to perform the automatic setting process with the desired device of the device A or B. In this way, after once stopping the communication parameter setting process in all apparatuses, the automatic setting process is retried in a situation where there is only one providing apparatus. As a result, it is possible to prevent reception of communication parameters from a providing device not intended by the user.

  Next, consider a case where network A and network B are the same network. The network configuration is as shown in FIG. FIG. 4 is a diagram illustrating device A, device D, device B, device E, and ad hoc network 41 (hereinafter, network A). Apparatus A, apparatus B, apparatus D, and apparatus E have already been subjected to automatic setting processing between the apparatuses, and network A is constructed using communication parameter A shared between apparatus A and each apparatus.

  FIG. 8 is a diagram illustrating an example of a processing sequence when the setting button 106 is pressed in the devices A, B, and C and an automatic setting process is performed between the devices.

  The devices A and B have already established the network A using the communication parameter A set by the automatic setting process (F801). Apparatus C does not construct a network.

  Here, the setting button 106 is pressed in each device. First, apparatus A confirms that it is participating in the network (F802). Since device A has already joined network A, it determines its role as a providing device. Then, it is searched whether there is a providing device other than the own device in the wireless LAN channel to which the own device belongs (F803). In order to search for a providing device, device A transmits a search signal (probe request) toward the wireless LAN channel to which the device belongs (F808). On the other hand, the apparatus B is also operating as a providing apparatus because the setting button 106 has already been pressed. Accordingly, in response to the search signal (F808), a search response signal (probe response) is transmitted from apparatus B to apparatus A (F809).

  The device B performs the same operation as the device A. That is, it confirms that it is participating in the network (F804). Since it has already joined the network, it determines its role as the providing device and searches for the providing device for the same wireless LAN channel (F805). The device B transmits a search signal to the same wireless LAN channel in order to search for a providing device (F810). Since device A is already operating as a providing device, a search response signal is transmitted from device A to device B (F811).

  With the above processing, the device A grasps the presence of the device B, and the device B grasps the presence of the device A. In other words, each of the devices A and B detects that there are a plurality of providing devices (F812, F814).

  When the devices A and B detect that there are a plurality of providing devices, the devices A and B execute predetermined processes with each other, and determine which one will be the providing device according to a predetermined criterion (F824, F825). As a predetermined standard here, for example, the device identifier such as a MAC address or UUID is used, and a device having a large identifier is a providing device. This identifier may be a part of the MAC address or UUID. Both MAC address and UUID may be used. Further, the comparison may be performed based on the type of communication device (printer, camera, etc.), usage pattern, power source type (battery drive, AC power drive, etc.), or communication device capability such as CPU power. Moreover, in order to determine a providing apparatus, a predetermined message may be exchanged and a providing apparatus may be determined based on the exchanged information. In the example of FIG. 8, it is assumed that the device B becomes the providing device, and the device A ends the processing of the providing device (F813).

  On the other hand, since the device C does not participate in the network, the network search process is performed for a plurality of wireless LAN channels (F806). The wireless LAN channel to be searched may be all wireless LAN channels supported by the communication device, or may be a plurality of channels designated in advance by the user. Apparatus C transmits a search signal to each channel (F807). Note that the search signal may include an information element indicating that it has an automatic setting function or that an automatic setting process is being performed. The device C detects that the two providing devices of the device A and the device B exist in the same network. When the device C detects a plurality of providing devices in the same network, the device C waits for the providing devices to be determined as one of them. When the search is repeated for a predetermined time and the search signal (F816) is transmitted, the search response signal (F817) is transmitted only from the device B. Here, the providing apparatus is determined to be apparatus B. Of course, at the time when it is detected that two providing devices exist in the same network, as in the case of a plurality of providing devices in different networks or in infrastructure mode WPS, device C automatically sets up. You may cancel it. When the device C cancels the automatic setting, a display that prompts the user to press the setting button 106 again may be displayed on the user interface. When the setting button 106 is pressed again, the providing device is unified between the device A and the device B. If the device C decides to execute the communication parameter automatic setting process with the device B, it joins the network A (F818).

  In the description of the present embodiment, the setting buttons of the devices A, B, and C are operated at substantially the same timing. Needless to say, when the button pressing timing of the device C is later than those of the devices A and B, the number of providing devices is fixed at the time when the device C performs the automatic setting process. Processing that waits for the providing device to be fixed to either one or processing that temporarily cancels the processing is not performed.

  As a result, the communication messages (protocol messages) exchanged in the communication parameter automatic setting protocol processing are mutually transmitted and received between the devices B and C. Note that when the device C joins the network A in F818, since communication parameters such as an encryption key and an authentication key are not set in the device C, the device C normally uses encryption and authentication with the device B. Data communication cannot be performed. When the device C joins the network A, the device C transmits a message indicating activation of communication parameter setting to the device B (F819). In response to the message, the communication parameter A is provided from the device B to the device C (F820). When the provision processing is completed, the device B transmits a communication parameter setting completion message to the device C. (F821). Thereby, the communication parameter setting process is completed, and the communication parameter B is shared between the devices B and C.

  Then, apparatus B and apparatus C perform communication connection processing using the shared communication parameter B (F822). When the communication parameter setting process is completed, the communication connection process is automatically started, so that the apparatuses B and C can communicate without forcing the user to perform an operation.

  FIG. 9 is a flowchart illustrating an example of an operation flow in the devices A, B, and C. The operation of FIG. 9 is implemented by the control unit 102 of each device reading and executing a control program stored in the storage unit 103. Hereinafter, control executed by each device will be described with reference to this flowchart.

  First, the apparatus determines whether or not the setting button 106 for instructing the start of the automatic setting process has been pressed (S901). If it is determined that the setting button 106 has been pressed, the apparatus determines whether or not it is participating in the network (S902).

  If not participating in the network, a timer T1 that is a time limit for the search process of the providing device is started (S903). It is determined whether the timer T1 has expired (S904). If the timer has not expired, a search signal (for example, a probe request) is transmitted to all wireless LAN channels (S905). After transmitting the search signal, it is determined whether or not a search response signal is received from the providing apparatus (S906). If no search response signal is received from the providing device, the process returns to S904 again, and the search signal transmission process (S905) is repeated until the timer T1 expires.

  When the search response signal is received from the providing device, it is determined whether there are a plurality of providing devices in different networks (S907). If a plurality of providing apparatuses existing in different networks are not detected, it is determined whether or not a plurality of providing apparatuses exist in the same network (S922). If there is only one providing device on the same network, the communication device sets its role to the receiving device (S908), and performs communication parameter reception processing (S909). That is, it requests the providing apparatus to start communication parameter setting, and receives provision of communication parameters from the providing apparatus.

  As a result of S922, when there are a plurality of providing devices on the same network, arbitration is performed on the providing device side, so that the system waits until there is one providing device (S923). Thereafter, when the number of providing devices becomes one, the communication device sets its role to the receiving device (S908), and performs communication parameter reception processing (S909). Note that the standby process in S923 may not be performed, and the process may be stopped when a plurality of providing apparatuses are detected in the same network. When stopping the process, it is preferable to display a message indicating that the process is stopped on the display unit 105 and to perform a process such as prompting the user to press the setting button 106 again. In this case, there is a high possibility that there is only one providing device when the button is pressed again.

  On the other hand, in S907, when the communication device detects a plurality of providing devices in different networks, it is determined whether the communication device has a selection unit for selecting one specific providing device from the plurality of providing devices. Determine (S910). If there is a selection means, a display for selection is performed, and a providing apparatus to which communication parameters are to be provided is designated by a user operation (S911). After specifying the providing device, the role of the own communication device is set in the receiving device (S908), the designated providing device is requested to start communication parameter setting, and the communication parameter receiving process is performed (S909). This selection process is the operation of the communication apparatus C in FIG. 5 described above.

  In S910, when the communication device does not have a selection unit, the communication device transmits a stop instruction signal for providing device processing to all detected providing devices (S912). This stop instruction signal transmission process is the operation of the communication apparatus C in FIG. 6 described above.

  Even if the communication apparatus has a selection unit in S910, the process may proceed to S912 without proceeding to S911 depending on the user's intention and the implementation policy of the communication apparatus. Further, the processing of S911 or S912 may be performed without performing the determination of S910. That is, in S907, when a plurality of providing devices are detected in different networks by the communication device, display for selection may be performed, and the providing device to which the communication parameter is to be provided may be designated by a user operation. (S911). In S907, when a plurality of providing devices are detected in different networks by the communication device, a stop instruction signal for providing device processing may be transmitted to all detected providing devices (S912).

  Next, processing when the communication apparatus is participating in the network will be described. When participating in the network in the determination process of S902, the role is set in the providing apparatus (S913), and the timer T2 that is the time limit for the search process of the providing apparatus is started (S914).

  Thereafter, a search signal (probe request) is transmitted to the wireless LAN channel to which the communication apparatus belongs (S915). After transmitting the search signal, it is determined whether or not a search response signal (probe response) is received from another providing device (S916). When the search response signal from the providing device is not received, it is determined whether or not the timer T2 has expired (S921). If the timer T2 has not expired, the process returns to S915 to perform the search process again.

  In S921, when the timer T2 expires without receiving a search response signal from the providing device, there is no other providing device on the same wireless LAN channel as the own communication device, so the communication parameter providing process is started. (S920).

  On the other hand, if a search response signal is received from another providing device in S916, it means that there are a plurality of providing devices (S917). Therefore, it is determined whether or not to continue the processing as the providing device (S919). In this determination, first, it is determined whether a plurality of providing devices including the own communication device exist in the same network. When another providing apparatus exists in the same network, it is determined based on a predetermined criterion whether the own communication apparatus or another providing apparatus continues the function of the providing apparatus. As a predetermined standard here, for example, the device identifier such as a MAC address or UUID is used, and a device having a large identifier is a providing device. This identifier may be a part of the MAC address or UUID. Both MAC address and UUID may be used. Further, the comparison may be performed based on the type of communication device (printer, camera, etc.), usage pattern, power source type (battery drive, AC power drive, etc.), or communication device capability such as CPU power. Moreover, in order to determine a providing apparatus, a predetermined message may be exchanged and a providing apparatus may be determined based on the exchanged information. When the communication apparatus determines that the process as the providing apparatus is to be continued, the communication apparatus provides the communication parameter. In other words, the communication parameter setting activation request is waited, and when the request is received, the communication parameter is provided to the receiving device. If another providing device is a providing device, that is, if it is determined that the communication device does not perform processing as the providing device, the processing ends.

  When other providing devices exist in different networks, the processing of the providing device is continued when the activation signal (F519) for communication parameter setting is received from the receiving device (device C). In addition, when the stop instruction signal (F617, F618) of the providing apparatus process is received, the process of the providing apparatus is stopped. If the own communication device may remain the providing device, the communication parameter providing process is performed as it is (S920). On the other hand, when stopping the process of the providing apparatus, the communication parameter automatic setting process is terminated. In S919, only one of the plurality of providing devices is intended to continue the providing device, but all devices may stop the operation as the providing device.

  As described above, according to the above description, it is possible to prevent the communication parameter automatic setting process from failing due to the presence of a plurality of providing devices. In addition, even if there are a plurality of providing devices, as long as the providing device is in the same network, the communication parameter can be provided from any providing device so that it can participate in the same network. , Can join the network.

<Embodiment 2>
In this embodiment, it is the same that the network A and the network B are different networks, but an example in which the providing apparatus is automatically determined even when the wireless LAN channel is the same will be described.

  FIG. 7 is a diagram illustrating an example of a processing sequence when the setting button 106 is pressed in the devices A, B, and C and an automatic setting process is performed between the devices.

  The device A has already established the network A with the device D using the communication parameter A set by the automatic setting process performed with the device D (F701). The device B has already established the network B with the device E using the communication parameter B set by the automatic setting process performed with the device E (F704). Apparatus C does not construct a network.

  Here, the setting button 106 is pressed in each device. First, apparatus A confirms that it is participating in the network (F702). Since device A has already joined network A, it determines its role as a providing device. Then, it is searched whether there is a providing device other than the own device in the wireless LAN channel to which the own device belongs (F703). In order to search for the providing device, a search signal (probe request) is transmitted toward the wireless LAN channel to which the device belongs (F708). On the other hand, the apparatus B is also operating as a providing apparatus because the setting button 106 has already been pressed. Therefore, a search response signal (probe response) is transmitted from apparatus B to apparatus A in response to the search signal (F708) (F709).

  The device B performs the same operation as the device A. That is, it confirms that it is participating in the network (F705). Since it has already joined the network, it determines its role as the providing device and searches for the providing device for the same wireless LAN channel (F706). In order to search for a providing device, a search signal is transmitted toward the same wireless LAN channel (F710). Since device A is already operating as a providing device, a search response signal is transmitted from device A to device B (F711).

  With the above processing, the device A grasps the presence of the device B, and the device B grasps the presence of the device A. In other words, each of the devices A and B detects that there are a plurality of providing devices on the same wireless LAN channel (F713, F715). When the devices A and B detect that there are a plurality of providing devices, the devices A and B execute predetermined processes with each other, and determine which one will become the providing device according to a predetermined criterion (F724 and F725). As a predetermined standard here, for example, the device identifier such as a MAC address or UUID is used, and a device having a large identifier is a providing device. This identifier may be a part of the MAC address or UUID. Both MAC address and UUID may be used. Further, the comparison may be performed based on the type of communication device (printer, camera, etc.), usage pattern, power source type (battery drive, AC power drive, etc.), or communication device capability such as CPU power. Moreover, in order to determine a providing apparatus, a predetermined message may be exchanged and a providing apparatus may be determined based on the exchanged information. In the example of FIG. 7, it is assumed that the device B is the providing device, and the device A ends the processing of the providing device (F714).

  On the other hand, since the device C does not participate in the network, the network search process is performed for a plurality of wireless LAN channels (F707). The wireless LAN channel to be searched may be all wireless LAN channels supported by the communication device, or may be a plurality of channels designated in advance by the user. Apparatus C transmits a search signal to each channel (F712). Note that the search signal may include an information element indicating that it has an automatic setting function or that an automatic setting process is being performed.

Device C detects that two providing devices, device A and device B, are present on the same channel. Since the device C has a plurality of providing devices on the same channel, the device C waits for the providing devices to be determined as one of them. When the search is repeated for a predetermined time and the search signal (F717) is transmitted, the search response signal (F718) is transmitted only from the device B.
Here, the providing apparatus is determined to be apparatus B.

  Of course, when it is detected that two providing devices exist on the same channel, device C automatically sets at this point, as in the case of a plurality of providing devices on different channels or infrastructure mode WPS. You may cancel it. When the device C cancels the automatic setting, the user interface may be prompted to press the setting button 106 again. When the setting button 106 is pressed again, the providing device is unified between the devices A and B.

  In F718, when the device C determines to execute the communication parameter automatic setting process with the device B, the device C participates in the network B (F719).

  In the description of this embodiment, the setting buttons of the devices A, B, and C are operated at substantially the same timing. Needless to say, when the button pressing timing of the device C is later than those of the devices A and B, the number of providing devices is fixed at the time when the device C performs the automatic setting process. Processing that waits for the providing device to be fixed to either one or processing that temporarily cancels the processing is not performed.

  As a result, the communication messages (protocol messages) exchanged in the communication parameter automatic setting protocol processing are mutually transmitted and received between the devices B and C. Note that when the device C joins the network B in F719, since communication parameters such as an encryption key and an authentication key are not set in the device C, the device C normally uses encryption and authentication with the device B. Data communication cannot be performed. When the device C joins the network B, the device C transmits a message indicating activation of communication parameter setting to the device B (F720). In response to the message, the communication parameter B is provided from the device B to the device C (F721). When the provision processing is completed, the device B transmits a communication parameter setting completion message to the device C. (F722). Thereby, the communication parameter setting process is completed, and the communication parameter B is shared between the devices B and C.

  Then, the devices B and C perform communication connection processing using the shared communication parameter B (F723). When the communication parameter setting process is completed, the communication connection process is automatically started, so that the apparatuses B and C can communicate without forcing the user to perform an operation.

  In order to perform the operation in FIG. 7, the devices A and B determine whether there are a plurality of providing devices in different channels instead of S <b> 907 in FIG. 9. If a plurality of providing devices are detected by the determination, the process proceeds to S910. Alternatively, the process proceeds to either S911 or S912. If there are not a plurality of providing devices in different channels, it is determined whether there are a plurality of providing devices in the same channel instead of S922. If there are a plurality of providing devices on the same channel, the process proceeds to S923.

  As described above, according to the present embodiment, the providing device is automatically determined when the providing device exists in the same channel even if the providing device exists in a different network. Therefore, the receiving device communicates with any of the providing devices. You can receive parameters.

  Moreover, in S919 of FIG. 9, it is determined whether there are a plurality of providing apparatuses including the own communication apparatus. When another providing apparatus exists, it is determined based on a predetermined criterion whether the own communication apparatus or another providing apparatus continues the function of the providing apparatus. As a predetermined standard here, for example, the device identifier such as a MAC address or UUID is used, and a device having a large identifier is a providing device. This identifier may be a part of the MAC address or UUID. Both MAC address and UUID may be used. Further, the comparison may be performed based on the type of communication device (printer, camera, etc.), usage pattern, power source type (battery drive, AC power drive, etc.), or communication device capability such as CPU power. Moreover, in order to determine a providing apparatus, a predetermined message may be exchanged and a providing apparatus may be determined based on the exchanged information. When the communication apparatus determines that the process as the providing apparatus is to be continued, the communication apparatus provides the communication parameter. In other words, the communication parameter setting activation request is waited, and when the request is received, the communication parameter is provided to the receiving device. If another providing device is a providing device, that is, if it is determined that the communication device does not perform processing as the providing device, the processing ends. As described above, the determination in S919 does not need to determine whether or not the plurality of providing devices are in the same network, and performs the providing device determination process if there are a plurality of providing devices.

  As described above, also in this embodiment, it is possible to prevent the communication parameter automatic setting process from failing when there are a plurality of providing apparatuses. In addition, even if the providing devices are in different networks, if the providing devices exist on the same wireless LAN channel, the providing devices can also detect other providing devices, so it is possible to determine which providing device continues processing among the providing devices. .

  As described above, according to the present invention, it is possible to reduce the possibility that the communication parameter automatic setting process fails when there are a plurality of providing devices. Even if there are a plurality of providing devices, the possibility of receiving communication parameters from the providing device intended by the user increases. Also, as long as providing devices of the same network receive communication parameters from any providing device, they can participate in the same network. Therefore, they can receive provision from any providing device and participate in the network.

  In the above description, the providing device is searched by active scan using the search signal and the search response signal. However, passive scanning that searches for the providing device by waiting for reception of a beacon may be used. Further, the providing device may be searched by combining active scan and passive scan.

  Also, the above description has been made with reference to an IEEE 802.11-compliant wireless LAN as an example. However, the present invention may be implemented in other wireless media such as wireless USB, MBOA, Bluetooth (registered trademark), UWB, and ZigBee. Moreover, you may implement in wired communication media, such as wired LAN.

  Here, MBOA is an abbreviation for Multi Band OFDM Alliance. UWB includes wireless USB, wireless 1394, WINET, and the like. In addition, the network identifier, the encryption method, the encryption key, the authentication method, and the authentication key are exemplified as communication parameters, but other information may be used, and other information may be included in the communication parameters. Needless to say.

  According to the present invention, a recording medium recording software program codes for realizing the above-described functions is supplied to a system or apparatus, and a computer (CPU, MPU) of the system or apparatus reads and executes the program codes stored in the recording medium. It may be.

DESCRIPTION OF SYMBOLS 201 Apparatus apparatus 202 Communication parameter automatic setting functional block 203 Packet receiving part 204 Packet transmission part 205 Search signal transmission part 206 Search signal reception part 207 Network control part 208 Communication parameter reception part 209 Communication parameter provision part 210 Automatic setting control part 211 Communication parameter Provider detection unit 212 Communication parameter storage control unit 213 Beacon control unit 214 Beacon generation unit

Claims (12)

A communication device,
Search means for searching for a communication parameter providing device;
A selection means for selecting from which providing apparatus the communication parameter is received when a plurality of the providing apparatuses are detected by the search means;
A communication apparatus comprising:   The communication device according to claim 1, wherein the selection unit displays information for allowing a user to select the providing device on a display unit.   The communication apparatus according to claim 1, wherein the selection unit causes a user to select the providing apparatus according to a network in which a plurality of providing apparatuses exist.   The communication device according to claim 1, wherein the selection unit causes a user to select the providing device according to a channel in which a plurality of providing devices exist. A communication device,
Search means for searching for a providing device for providing communication parameters to the receiving device;
When the providing device is detected by the search unit, a determining unit that determines a providing device that provides communication parameters to the receiving device from the communication device and the detected providing device based on a predetermined rule;
A communication apparatus comprising:   The communication apparatus according to claim 5, further comprising a termination unit that terminates the process as the communication parameter providing apparatus in response to the determination by the determination unit.   The communication device according to claim 5, wherein the search unit searches for a channel providing device in which the communication device exists.   8. The determination unit according to claim 5, wherein the determination unit determines a providing device that provides communication parameters to the receiving device according to a network in which the providing device detected by the search unit exists. The communication apparatus as described in.   8. The determination unit according to claim 5, wherein the determination unit determines a providing device that provides a communication parameter to the receiving device according to a channel in which the providing device detected by the search unit exists. The communication apparatus as described in. A communication device control method comprising:
Search for communication parameter provider,
A method for controlling a communication device, comprising: performing processing for selecting from which providing device a communication parameter is received when a plurality of providing devices are detected. A communication device control method comprising:
Search for a providing device for providing communication parameters to the receiving device;
When a providing device is detected, the communication device executes processing for determining a providing device that provides communication parameters to the receiving device from the communication device and the detected providing device based on a predetermined rule. Control method.   The program for operating a computer as a communication apparatus of any one of Claims 1 thru | or 9.

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