JP6444095B2 - Communication apparatus, control method, and program - Google Patents

Description

  The present invention relates to a communication device that acquires position information.

  There is a technique for adding position information acquired by a communication device such as a smartphone or a logger to image data of an image pickup device that does not have a position information acquisition function such as GPS (Global Positioning System). In general, since the communication device does not know the imaging timing of the imaging device, it is necessary to continuously acquire the position information. As a result, the power consumption of the communication device increases.

  On the other hand, the imaging device and the communication device are always wirelessly connected, and the imaging device uses wireless communication to request position information from the communication device at the time of imaging. A method for acquiring position information has been proposed (Patent Document 1).

JP2010-258593

  However, the above-described method has a problem in that the power consumption of the communication device increases because the communication device maintains a wireless connection even during a period in which position information is not acquired.

  In view of the above problems, an object of the present invention is to be able to notify the timing of starting up a wireless unit without maintaining mutual connection.

  The communication device of the present invention includes a first wireless communication unit that detects a notification signal including predetermined information from another communication device that is not connected to the communication device, and the notification signal is transmitted by the first wireless communication unit. An activation means for activating a second wireless communication means different from the first wireless communication means in response to the detection; and when the activation means activates the second wireless communication means, the second wireless communication means Receiving means for acquiring position information of the communication device by receiving a wireless signal for acquiring position information, and receiving a predetermined response signal from the other communication device. If not, the acquisition unit stops acquiring position information.

  ADVANTAGE OF THE INVENTION According to this invention, the timing which starts a radio | wireless part can be notified, without maintaining a mutual connection.

1 is a network configuration diagram according to an embodiment of the present invention. Block diagram of the portable terminal 101 Block diagram of the digital camera 102 Flowchart of position information acquisition mode performed by the mobile terminal 101 Flowchart of position information acquisition request executed by the digital camera 102 Flowchart of position information continuation acquisition request executed by the digital camera 102 Location information acquisition sequence diagram Sequence diagram for continuous acquisition of location information

  FIG. 1 is a network configuration diagram of this embodiment. The network shown in FIG. 1 includes a mobile terminal 101, a digital camera 102, a GNSS satellite 104, and a mobile phone base station 105. Note that GNSS is an abbreviation for Global Navigation Satellite System. In the present embodiment, the mobile terminal 101 and the digital camera 102 are communication devices having a wireless communication function. The wireless communication function is a function of performing wireless communication via a wireless LAN compliant with, for example, IEEE 802.11 series. In addition, the mobile terminal 101 has a function of receiving a GNSS signal that is a radio signal transmitted from the GNSS satellite 104, and can acquire position information of the mobile terminal 101.

  The digital camera 102 can construct a wireless LAN network 103. The mobile terminal 101 can search the wireless LAN network 103. Furthermore, the mobile terminal 101 can be connected to the backbone network 106 via the mobile phone base station 105. The backbone network 106 is, for example, the Internet.

  FIG. 2 is a block diagram illustrating an example of the configuration of the mobile terminal 101 according to an embodiment to which the present invention can be applied.

  The wireless LAN control unit 201 is a wireless communication unit, and performs various controls of wireless LAN RF control, wireless LAN communication processing, and wireless LAN communication conforming to the IEEE802.11 series. Reference numeral 202 denotes an antenna for performing wireless LAN communication. A control unit 203 includes a CPU and an MPU, and controls the entire mobile terminal 101 by executing a control program stored in the storage unit 204. A storage unit 204 includes a RAM and a ROM, and stores a control program executed by the control unit 203 and various types of information such as communication parameters necessary for communication. Various operations described below are performed by the control unit 203 executing a control program stored in the storage unit 204.

  A power supply unit 205 supplies power to the mobile terminal 101. The power supply unit 205 may be supplied with power by a commercial power supply or may be supplied with power by a battery. Reference numeral 206 denotes an operation unit for the user to operate the mobile terminal 101. Reference numeral 207 denotes a display unit that performs various displays, and has a function capable of outputting information that can be visually recognized by the user, such as an LCD or LED, or a sound output from a speaker or the like. A public wireless control unit 208 performs RF control of public wireless communication, public wireless communication processing for performing public wireless communication, various controls of public wireless communication, and protocol processing related to public wireless communication. Public wireless communication is based on, for example, the IMT (International Multimedia Communication) standard, the LTE (Long Term Evolution) standard, and the like.

  Reference numeral 209 denotes an antenna for performing public wireless communication. The GNSS control unit 210 is a wireless communication unit different from the wireless LAN control unit 201, and performs GNSS RF control, GNSS signal reception processing for receiving a GNSS signal, and various controls of GNSS signal reception. GNSS is, for example, GPS, GLONASS, GALILEO, or the like. Reference numeral 211 denotes an antenna for receiving a GNSS signal. A position information acquisition unit 212 acquires the position information of the mobile terminal 101 using GNSS, wireless LAN, or public wireless. A packet transmission / reception unit 213 transmits / receives packets related to various types of communication. Reference numeral 214 denotes a call unit for a user to make a call, and reference numeral 215 denotes a microphone.

  FIG. 3 is a block diagram illustrating an example of the configuration of the digital camera 102 according to an embodiment to which the present invention is applicable.

  Reference numeral 301 denotes a wireless LAN control unit that performs wireless LAN RF control, wireless LAN communication processing, a driver for performing various control of wireless LAN communication compliant with the IEEE 802.11 series, and protocol processing related to wireless LAN communication. Reference numeral 302 denotes an antenna for performing wireless LAN communication. A control unit 303 controls the entire mobile terminal 101 by executing a control program stored in the storage unit 304. A storage unit 304 stores a control program executed by the control unit 303 and various types of information such as parameters necessary for communication. Various operations described later are performed by the control unit 303 executing a control program stored in the storage unit 304. Reference numeral 305 denotes an operation unit for operating the digital camera 102. Reference numeral 306 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 307 denotes a microphone. A packet transmitting / receiving unit 308 transmits and receives packets related to various types of communication. Reference numeral 309 denotes an imaging unit that captures an optical image of a subject. An image processing unit 310 converts the captured image output from the imaging unit 309 into image data of a predetermined format and performs various processes such as luminance and color correction of the image data. Reference numeral 311 denotes an encoding / decoding unit that performs predetermined high-efficiency encoding (for example, DCT conversion, variable length encoding after quantization) on the image data output from the image processing unit 310. Reference numeral 312 denotes a recording / reproducing unit that records and reproduces compression-encoded image data on a recording medium (not shown). A power supply unit 313 supplies power to the digital camera 102.

  Note that the GNSS satellite 104 can be realized by a general GNSS satellite configuration, and thus description thereof is omitted here. Further, since the mobile phone base station 105 can also be realized by the configuration of a general public radio communication base station, description thereof is omitted here.

  All functional blocks have a mutual relationship in 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.

  In the present embodiment, first, when the mobile terminal 101 starts the position information acquisition mode, the wireless LAN function is operated and reception of the notification signal is started. The position information acquisition mode is a state in which preparations for starting acquisition of position information are made as necessary. Hereinafter, a beacon compliant with the IEEE 802.11 series will be described as an example of the notification signal. However, the present invention is not limited to this, and it may be a beacon compliant with the Bluetooth (registered trademark) standard, or may be a predetermined signal periodically compliant with another standard.

  When the digital camera 102 starts imaging processing, the digital camera 102 determines whether or not to request continuous acquisition of position information, and operates a wireless LAN function according to the determination result to transmit a position information acquisition request beacon signal described later. Start. When the portable terminal 101 receives the position information acquisition request beacon signal transmitted from the digital camera 102, the portable terminal 101 starts the position information acquisition process and calculates the current position. When the calculation of the current position is completed, the portable terminal 101 stores the position information and transmits a search signal to the digital camera 102. Hereinafter, a probe request signal (hereinafter referred to as a probe request) conforming to the IEEE 802.11 series will be described as an example of the search signal.

  When the digital camera 102 receives the probe request, the digital camera 102 transmits a Probe Response signal (hereinafter referred to as a probe response) to the mobile terminal 101 and stops transmitting the position information acquisition request beacon signal. Here, the probe response is a response signal to the probe request signal.

  These processes will be described in detail with reference to FIGS.

  FIG. 4 is a flowchart realized when the control unit 203 reads a program stored in the storage unit 204 when the mobile terminal 101 starts the position information acquisition mode. In the present embodiment, the position information acquisition mode is started when the mobile terminal 101 is turned on. However, the present invention is not limited to this, and the position information acquisition function may be turned on, or may be started when the user performs a predetermined button operation.

  When this process is started, first, in step S401, the wireless LAN control unit 301 starts detection of a wireless network generated by a device that is not connected to the mobile terminal 101, and proceeds to step S402.

  Here, the portable terminal 101 and the digital camera 102 are not connected. Note that the unconnected state is a state in which connection in a layer higher than the data link layer in the OSI reference model is not established.

  Specifically, the wireless LAN control unit 301 receives a beacon signal that is periodically or intermittently transmitted from the digital camera 102 that is not connected to the mobile terminal 101. Note that reception of the beacon signal is performed by periodically scanning all frequency channels of the wireless LAN network. By receiving the beacon signal, the wireless LAN control unit 301 detects a wireless network generated by the digital camera 102 that is not connected to the mobile terminal 101.

  Next, in S402, the wireless LAN control unit 301 determines whether or not a predetermined wireless network that requests acquisition of position information has been detected. Specifically, the wireless LAN control unit 301 determines whether a position information acquisition request beacon signal has been received. Here, the position information acquisition request beacon is a beacon whose SSID of the beacon signal is a predetermined SSID stored in the mobile terminal 101 in advance. However, the present invention is not limited to this. For example, the determination may be made based on whether a specific character string is included in the SSID in the beacon signal or a predetermined attribute is set. Here, the SSID is wireless network identification information.

  If a predetermined wireless network requesting acquisition of position information is detected, the process proceeds to S405, and if not, the process proceeds to S403. In S403, the control unit 203 determines whether to end the position information acquisition mode. Here, it is assumed that the determination is made by turning off the mobile terminal 101, turning off the position information acquisition function, executing a button operation by the user, or the like, but is not limited thereto. When it determines with complete | finishing, it progresses to S404 and the portable terminal 101 stops reception of a beacon signal, and complete | finishes position information acquisition mode. If not, the process returns to S402.

  Next, a case where the received beacon signal is a position information acquisition request beacon signal will be described. When the wireless LAN control unit 301 stops receiving the beacon signal in S405, the process proceeds to S406, where the location information acquisition unit 212 activates the GNSS control unit 210 and starts the location information acquisition process. The position information acquisition process is performed by acquiring mobile phone base station information or a GNSS signal. However, the present invention is not limited to this. For example, the position information may be acquired from a server on an external network.

  In any case, a wireless unit different from the wireless LAN control unit 201 that can be used for connection to the wireless network generated by the digital camera 102 is activated.

  Next, in S407, the position information acquisition unit 212 calculates the current position, and the process proceeds to S408. Here, the calculation of the current position assumes that the position information of the mobile terminal 101 is acquired by performing three-dimensional positioning and coordinate correction based on the position information acquired in the position information acquisition process. It is not limited. For example, the position information of the mobile terminal 101 may be acquired based on the radio wave intensity from a plurality of base stations instead of performing three-dimensional positioning.

  When the calculation of the current position is completed, the storage unit 204 stores the acquired position information in S408, and proceeds to S409. The location information to be stored includes current location information, current time information, SSID of the location information acquisition request beacon signal, and the like, which are stored in association with each other.

  In S409, similarly to S403, the control unit 203 determines whether or not to end the position information acquisition mode. If it is determined to end, the process proceeds to S410, where the position information acquisition unit 212 stops the position information acquisition process and ends the position information acquisition mode. If not completed, the process proceeds to S411, and the control unit 203 determines whether or not the position information acquisition request is a continuous acquisition request.

  Here, the continuous acquisition request is a signal for requesting the mobile terminal 101 to continuously acquire position information without the digital camera 102 transmitting a position information acquisition request beacon signal. The determination as to whether or not the request is a continuous acquisition request is made based on whether a specific character string is included in the wireless network identifier of the beacon signal or a predetermined extended attribute is set, but is not limited thereto. It is not a thing.

  If it is a continuous acquisition request, the process returns to S407, and if it is not a continuous acquisition request, the process proceeds to S412. In S412, the mobile terminal 101 transmits a probe request and proceeds to S413. In S413, the mobile terminal 101 determines whether or not a probe response that is a response signal to the probe request has been received. If received, the process returns to S407, and if not received, the process proceeds to S414. In S414, the portable terminal 101 stops the position information acquisition process and returns to S401.

  That is, if it is not a continuous acquisition request, the mobile terminal 101 checks whether the digital camera 102 exists in the surroundings, and if it is in the surroundings, continues to acquire position information, and does not exist in the surroundings In this case, the acquisition of position information is stopped. On the other hand, in the case of a continuous acquisition request, the mobile terminal 101 continues to acquire position information without confirming whether the digital camera 102 exists in the vicinity.

  In this process, reception of the beacon signal is stopped when the position information acquisition request beacon signal is received. However, it is not necessary to stop the reception. For example, it may be a case of receiving position information acquisition requests for a plurality of opposing devices. In addition, the position information acquisition process is immediately stopped when a probe response is not received in this process, but may be stopped at another timing. For example, when a probe request is transmitted a predetermined number of times and a probe response cannot be received continuously, or after reception of a beacon signal is resumed, a position information acquisition request beacon signal is stopped for a certain period of time, etc. It is.

  Next, a flowchart realized when the control unit 303 reads out a program stored in the storage unit 304 when the digital camera 102 starts a position information acquisition request will be described with reference to FIG. In the present embodiment, this processing is performed when the digital camera 102 is powered on, shifted to the imaging mode, or performed by a user to perform a button operation.

  When this process is started, first, in step S501, the digital camera 102 determines whether to request continuous acquisition of position information. Note that whether to request continuous acquisition is determined using predetermined conditions such as the remaining battery level and the imaging mode type. For example, when the remaining battery level is equal to or less than the threshold value, or when the imaging mode type is the moving image mode, continuous acquisition is requested. Since the position information can be continuously acquired even when the digital camera 102 does not continue to transmit the beacon when the remaining battery level is equal to or less than the threshold value, a decrease in the remaining battery level of the digital camera 102 can be suppressed. Further, in the moving image mode, the digital camera 102 can concentrate on the processing for moving image shooting because the position information can be continuously acquired even if the digital camera 102 does not continuously transmit the beacon, thereby reducing the processing load. be able to.

  If continuous acquisition is requested, the process proceeds to S502. If continuous acquisition is not requested, the process proceeds to S503. In S502, the digital camera 102 makes a position information continuation acquisition request. Hereinafter, the details of S502 will be described with reference to FIG.

  First, in S601, the digital camera 102 creates a wireless LAN network, and proceeds to S602. Here, the SSID of the wireless LAN network to be created is assumed to be the SSID of the digital camera 102 stored in advance in the mobile terminal 101, but is not limited to this, and may be other. For example, an SSID including a specific character string representing a position information continuation acquisition request. In S602, the digital camera 102 starts transmission of a position information continuation acquisition request beacon signal, and proceeds to S603. The position information continuation acquisition request beacon signal is a beacon signal including the SSID, but may be a beacon signal in which an extended attribute representing a position information continuation acquisition request is set. At this time, the digital camera 102 and the portable terminal 101 are not connected.

  Next, in S603, the digital camera 102 determines whether a probe request has been received. If a probe request is received, the process proceeds to S604, a probe response is transmitted, and the process proceeds to S607. If a probe request has not been received, the process proceeds to S605. In step S605, the digital camera 102 determines whether to time out the position information continuation acquisition request. The determination is made based on whether or not the elapsed time when the probe request is not received is equal to or greater than a threshold, but is not limited thereto. If timed out, the process proceeds to S606, and if not timed out, the process returns to S603. In step S606, the digital camera 102 issues an error notification and proceeds to step S607. The error notification here is assumed to be performed by displaying on the UI on the display that the mobile terminal 101 cannot correctly start the continuous acquisition of position information and notifying the user. However, the present invention is not limited to this, and the user may be notified using a speaker, LED, or the like. In this way, the user can be notified of the acquisition status of the requested position information.

  In S607, the digital camera 102 stops the transmission of the position information continuation acquisition request beacon signal, and proceeds to S608. In step S608, the digital camera 102 discards the wireless network and ends the position information continuation acquisition request. In this processing, the error acquisition is notified and then the continuous acquisition request is ended. However, it may not be ended. For example, receiving the probe request again. When the position information continuation acquisition request is completed by the above processing, the position information acquisition request is terminated.

  Next, an operation flow when continuous acquisition is not requested will be described. In S503, the digital camera 102 creates a wireless network. Here, the SSID of the wireless network to be created is the SSID of the digital camera 102 stored in advance in the mobile terminal 101, but is not limited to this, and the SSID including a specific character string representing a position information acquisition request, etc. But you can. Note that the SSID of the wireless network created in S601 is different from the SSID of the wireless network created in S503. At this time, the digital camera 102 and the portable terminal 101 are not connected.

  Next, in S504, the digital camera 102 starts transmission of a position information acquisition request beacon signal, and proceeds to S505. The position information acquisition request beacon signal here is a beacon signal including the SSID, but may be a beacon signal in which an extended attribute representing a position information acquisition request is set. In S505, the digital camera 102 determines whether or not to end the position information acquisition request. Here, the determination is made by turning off the power of the digital camera 102, shifting to the playback mode, executing a button operation by the user, or the like. In addition, it may be determined that the position information acquisition request is terminated when the acquisition of the position information is completed.

  If it is determined to end, the process proceeds to S506, and the digital camera 102 stops transmitting the position information acquisition request beacon signal. In step S507, the digital camera 102 discards the wireless network and ends the position information acquisition process.

  On the other hand, if it is determined that the process is not finished, the process proceeds to S508. In S508, the digital camera 102 determines whether a probe request has been received. If received, the process proceeds to S509, and the digital camera 102 transmits a probe response and proceeds to S510. If not received, the process proceeds to S512. In S510, the digital camera 102 determines whether or not transmission of the position information acquisition request beacon signal has been stopped. If it has been stopped, nothing is performed. If it has not been stopped, the digital camera 102 stops transmission in S511, and then returns to S505. In S512, the digital camera 102 determines whether to perform error notification. The determination is made based on whether or not the elapsed time when the probe request is not received is equal to or greater than a threshold value. If so, the process proceeds to S513, and if not, the process returns to S505. In step S513, the digital camera 102 issues an error notification for acquiring position information. In this case, the error notification is assumed to be performed by displaying on the UI on the display a notification for prompting confirmation because the location information is not correctly acquired in the mobile terminal 101 and notified to the user. However, the present invention is not limited to this, and the user may be notified using a speaker, LED, or the like. After performing the error notification, in S514, the digital camera 102 determines whether transmission of the position information acquisition request beacon signal has been stopped. If stopped, the process returns to S504, and if not stopped, the process returns to S505. In this process, the determination as to whether or not to request continuous acquisition is performed simultaneously with the start of the position information acquisition request, but may be performed at another timing. In addition, when the determination is performed at another timing and it is determined that the request for continuous acquisition is performed, the request may be switched to the position information continuous acquisition request in the middle of the processing of the position information acquisition request.

  Next, an example of a position information acquisition sequence between the portable terminal 101 and the digital camera 102 in the configuration shown in FIGS. 1 to 6 will be described with reference to FIGS.

  First, a communication sequence for obtaining position information will be described with reference to FIG. The user performs an operation for starting the position information acquisition mode in the portable terminal 101 (M701). When the operation is performed, the mobile terminal 101 starts receiving a beacon signal (M702). The user performs an operation for starting imaging in the digital camera 102 (M703). When the operation is performed, the digital camera 102 performs a position information continuation acquisition request determination (M704). When the digital camera 102 completes the continuous acquisition request determination, it creates a wireless network (M705). When the wireless network is created, transmission of a location information acquisition request beacon signal is started (M706), and thereafter, the location information acquisition request beacon signal is periodically transmitted (M707). When receiving the position information acquisition request beacon signal, the portable terminal 101 stops receiving the beacon signal (M708) and starts the position information acquisition process (M709). Thereafter, the mobile terminal 101 periodically acquires base station information and GNSS signals (M710, M711). The portable terminal 101 calculates the current position (M712) and stores the position information (M713). When the location information is stored, the portable terminal 101 transmits a probe request to the digital camera 102 (M714). Upon receiving the probe request, the digital camera 102 transmits a probe response to the mobile terminal 101 (M715), and stops transmitting the position information acquisition request beacon signal (M716). When the mobile terminal 101 receives the probe response, the mobile terminal 101 periodically repeats the calculation of the current position, the storage of the position information, and the probe request transmission (M717, M718). In the digital camera 102, the user performs an operation for ending the imaging (M719). When the operation is performed, the digital camera 102 discards the wireless network (M720). The portable terminal 101 transmits a probe request (M721), and when the probe response from the digital camera 102 cannot be received, the position information acquisition process is stopped (M722), and beacon signal reception is resumed (M723). Thereafter, when the portable terminal 101 receives the position information acquisition request beacon signal, the portable terminal 101 repeatedly performs the position information acquisition process. When the user performs an operation for ending the position information acquisition mode in the portable terminal 101 (M724), beacon signal reception is stopped (M725).

  Next, a communication sequence in continuous acquisition of position information will be described with reference to FIG. Since M801 to M815 are the same as the communication sequence for acquiring position information, the description thereof is omitted. When the digital camera 102 stops transmitting the position information continuation acquisition request beacon signal (M816), the wireless network is discarded (M817), and the imaging process is continued until the user performs an operation for ending the imaging (M820). . The mobile terminal 101 continuously calculates the current position and stores the position information (M818, M819), and stops the position information acquisition process when the user performs an operation to end the position information acquisition mode (M821). (M822).

  In the present embodiment, the portable terminal 101 transmits a probe request to the digital camera 102 when the position information is stored, and the digital camera 102 stops transmitting the position information acquisition request beacon signal when the probe request is received. I made it. In this way, the digital camera 102 can detect the start of acquisition of position information in the portable terminal 101, and power consumption can be further suppressed by stopping transmission of the beacon signal thereafter. Although the mobile terminal 101 transmits a probe request to the digital camera 102 when the location information is stored, the mobile terminal 101 may transmit it when receiving a beacon signal or starting a location information acquisition process. Accordingly, the digital camera 102 can immediately stop the transmission of the beacon signal without waiting for the completion of the acquisition of the position information in the mobile terminal 101, thereby further reducing power consumption. In particular, when the acquisition of position information is a cold start, it takes time to complete the acquisition. Therefore, it is expected that power consumption can be suppressed by transmitting a probe request before the acquisition is completed.

  In the present embodiment, the digital camera 102 makes a position information acquisition request as soon as imaging starts, but the request may not be made. For example, this is a case where a continuous acquisition request for position information has already been executed within a certain period in the past and has been successful.

  In the present embodiment, the digital camera 102 creates a wireless LAN network and transmits a beacon signal, and the mobile terminal 101 receives the beacon signal. For example, the digital camera 102 starts receiving a beacon signal when imaging starts, and after receiving the beacon signal of the mobile terminal 101, requests the mobile terminal 101 to acquire position information by a probe request.

  Thereafter, the position information and time information acquired by the portable terminal 101 are shared with the digital camera 102 in accordance with a user operation on the portable terminal 101 or the digital camera 102. At this time, the portable terminal 101 or the digital camera 102 stores the captured image and the positional information in association with each other based on the acquisition time of the positional information and the imaging time of the digital camera 102. For example, the positional information acquired at a time within 5 minutes of the difference from the time taken by the digital camera 102 is stored in association with the captured image obtained by the imaging. As a result, the user can know at which position the captured image is captured.

  As described above, by executing the present embodiment, it is possible to acquire position information with reduced power consumption without maintaining a wireless communication connection state. The position information acquired in this way is notified from the portable terminal 101 to the digital camera 102 together with time information indicating the time when the position information is acquired. In the digital camera 102, the position information is stored in association with image data captured at approximately the same time as the time when the position information was acquired. Note that the communication method used when notifying the location information may be the same as or different from the communication method used when creating the wireless network in S503 and S601. For example, both may be a wireless communication system compliant with the IEEE 802.11 series, while one is a wireless communication system compliant with the IEEE 802.11 series, while the other is a Bluetooth (registered trademark). A compliant wireless communication method may be used.

  In the above-described embodiment, the case where the present invention is applied to a wireless LAN compliant with IEEE 802.11 has been described. However, the present invention is not limited to this. For example, you may implement in other wireless media, such as wireless USB, MBOA, Bluetooth (trademark), UWB, 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.

  Specifically, a case where Bluetooth (registered trademark) Low Energy (BLE), which is one of the extended specifications of Bluetooth (registered trademark), is applied will be described.

  The above-described beacon signal is Advertising Indication or Advertising Direct Indication, and the probe request and the probe response are Scan Request and Scan Response, respectively. By applying BLE, position information can be acquired with further reduced power consumption. Also, Advertising Indication or Advertising Direct Indication is used instead of Scan Request. Furthermore, a BLE link may be established between the portable terminal 101 and the digital camera 102 by using a connection request instead of the scan response. In this case, the portable terminal 101 can immediately notify the position information to the digital camera 102 using the established BLE link. Note that a link may be established immediately by transmitting a connection request to advertising indication or advertising direct indication transmitted instead of the beacon signal. Further, the location information may be notified in the wireless LAN after the handover to the wireless LAN is performed in response to the transmission / reception of the Scan Request and the Scan Response, and the present invention is not limited to this.

  In the above-described embodiment, the IEEE802.11 compliant beacon is transmitted, the IEEE802.11 compliant wireless connection is performed, and the IEEE802.11 compliant wireless communication is performed to transmit / receive position information. However, the present invention is not limited thereto, and a Bluetooth (registered trademark) compliant beacon may be transmitted, wireless connection compliant with IEEE 802.11 may be performed, and wireless communication compliant with IEEE 802.11 may be performed to transmit and receive position information. That is, the communication standard used when transmitting a beacon may be different from the communication standard used when performing a wireless connection for communicating position information.

  Further, while the position information is being acquired, the user may be notified of the position information acquisition status. For example, when position information is given to a plurality of captured images, it is only necessary to display how many position information of the captured images have been acquired.

  In the above-described embodiment, in S402 of FIG. 4, the mobile terminal 101 determines whether or not the SSID of the received beacon signal is a predetermined SSID stored in advance, and if it is a predetermined SSID. , Started to get location information. Thereby, the portable terminal 101 can start acquisition of position information only in accordance with the beacon from the digital camera 102 set in the portable terminal 101 in advance by the user. That is, even when the mobile terminal 101 receives a beacon from an unintended partner, it can prevent acquisition of position information.

  Instead of or in addition to this, when the digital camera 102 transmits a probe response in S604 in FIG. 6, it is determined whether the probe request is stored in advance in the digital camera 102 from the portable terminal 101. You may make it determine. Here, the digital camera 102 stores the MAC address of the portable terminal 101 in advance, and determines whether it is a probe request from the portable terminal 101 by collating with the MAC address included in the probe request. Then, a probe response is transmitted only in response to a probe request from the mobile terminal 101 stored in advance in the digital camera 102. Even in this case, it is possible to prevent the mobile terminal 101 from intentionally starting acquisition of position information.

  In the above-described embodiment, the GNSS control unit 210 different from the wireless LAN control unit 201 is activated in response to the wireless LAN control unit 201 detecting a predetermined wireless network. However, the present invention is not limited to this, and in response to the detection of a predetermined wireless network by a Bluetooth (registered trademark) communication unit (not shown), a wireless LAN control unit 201 (a wireless unit different from the Bluetooth (registered trademark) communication unit (not shown)). ) May be activated.

  As a result, the communication device conforms to the IEEE802.11 series by generating a predetermined wireless network compliant with Bluetooth (registered trademark) at a necessary timing without maintaining the connection between the other device and Bluetooth (registered trademark). Communication can be started.

  Also, a process of supplying a program that realizes one or more functions of the above-described embodiment to a system or apparatus via a network or a storage medium, and one or more processors in a computer of the system or apparatus reading and executing the program But it is feasible. It can also be realized by a circuit (for example, ASIC) that realizes one or more functions.

DESCRIPTION OF SYMBOLS 101 Mobile terminal 102 Digital camera 103 Wireless LAN network 104 GNSS satellite 105 Mobile phone base station 106 Internet

Claims (12)

A communication device,
First wireless communication means for detecting a notification signal including predetermined information from another communication device not connected to the communication device;
Activating means for activating second wireless communication means different from the first wireless communication means in response to the notification signal being detected by the first wireless communication means;
When the activation means activates the second wireless communication means, the second wireless communication means receives the wireless signal for obtaining the position information, thereby obtaining the position information of the communication device. When,
Have
The communication device according to claim 1, wherein when the predetermined response signal is not received from the other communication device, the acquisition unit stops acquiring position information.   The communication apparatus according to claim 1, wherein the wireless signal is a GNSS (Global Navigation Satellite System) signal. A transmission means for transmitting the search signal;
The communication apparatus according to claim 1, wherein the predetermined response signal is a response signal to the search signal. Storage means for storing time information indicating the time when the acquisition means acquires position information and the position information in association with each other;
A notification means for notifying the other communication device of time information corresponding to the position information together with the position information acquired by the acquisition means;
The communication apparatus according to claim 1, further comprising:   5. The communication apparatus according to claim 1, wherein the first wireless communication unit detects the notification signal transmitted intermittently from the other communication apparatus. 6.   The communication apparatus according to claim 1, wherein the notification signal is a beacon.   The communication apparatus according to claim 1, wherein the predetermined information is information indicating that position information is requested.   8. The communication apparatus according to claim 7, wherein the information indicating that the location information is requested is predetermined wireless network identification information.   9. The communication apparatus according to claim 8, wherein the predetermined wireless network identification information is an SSID including a predetermined character string.   The communication apparatus according to any one of claims 1 to 9, wherein the first wireless communication unit performs wireless communication conforming to Bluetooth (registered trademark). A communication device control method comprising:
A detection step of detecting a notification signal including predetermined information from another communication device not connected to the communication device using the first wireless communication unit;
An activation step of activating a second wireless communication unit different from the first wireless communication unit in response to the notification signal being detected by the first wireless communication unit;
When the second wireless communication unit is activated, the second wireless communication unit receives a wireless signal for acquiring position information, thereby acquiring the position information of the communication device;
When a predetermined response signal is not received from the other communication device, a stop step of stopping the acquisition of the position information of the communication device;
A control method characterized by comprising:   The program for operating a computer as a communication apparatus of any one of Claim 1 to 10.

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