JP5673876B2 - Wireless communication device, peripheral device including the same, and wireless communication method - Google Patents

Description

  The present invention relates to a wireless communication device or the like that searches for a communication partner that is a connection destination candidate for wireless communication, and in particular, when it is a device that mainly performs reception, performs an appropriate search according to the state of the device. It is related with the radio | wireless communication apparatus etc. which can be performed.

  Conventionally, wireless communication devices that search for a communication partner such as a base station (access point) as a connection destination candidate and perform communication based on the result are known, and electronic devices such as printers equipped with the device are widely used. doing.

  For the above-mentioned connection destination candidate search, the wireless communication device usually detects the connection destination candidate by transmitting search data (probe request) and receiving response data (probe response) from the base station to the data. There are active scan and passive scan methods of detecting connection destination candidates by receiving broadcast data (beacons) transmitted from a base station or the like without transmitting from the wireless communication device.

  With respect to the use of such active scan and passive scan, several inventions have been proposed in the past. For example, in Patent Document 1 below, active scan is based on a factor for searching for a base station or a communication state of a wireless terminal device. It has been proposed to select one of the passive scans.

JP 2005-12539 A

  The above-described active scan has the advantage of being able to search in a shorter time than the passive scan and requesting the necessary information, but has the disadvantage of consuming radio resources because a probe request needs to be transmitted. is there. On the other hand, the passive scan can perform a relatively reliable search, but has a disadvantage in that information that can take a long time is limited.

  Further, in the case of active scanning, depending on the specifications of the communication processing unit of the wireless communication apparatus that performs the active scanning, they may not be detected depending on the state of the communication partner (such as an access point).

  From the above, an appropriate search method should be selected according to the state and needs of the wireless communication device.

  In the apparatus described in Patent Document 1, a search method is determined according to a communication state (whether or not communication is in progress), and passive scan is selected when communication is not being performed. In the wireless communication in the device to be performed, it is not preferable to select the time-consuming passive scan because it is not known when print data (job data) or the like is received even if communication is not performed at that time. Therefore, a wireless communication apparatus that mainly performs reception needs to make a determination based on another index.

  Accordingly, an object of the present invention is a wireless communication device that searches for a communication partner that is a connection destination candidate for performing wireless communication, and is suitable for the state of the device when the device mainly performs reception. The object is to provide a wireless communication device capable of executing a search.

  In order to achieve the above object, according to one aspect of the present invention, when a wireless communication apparatus that mainly performs reception searches for a connection destination candidate, is a wireless connection established with any of the connection destinations? Depending on whether or not, an active scan for performing the search is performed by transmitting search data and receiving response data for the search data, or a passive scan for performing the search by notification data received from the surroundings Is to decide what to do.

  Furthermore, in the above invention, a preferable aspect thereof is that the search is not a search performed prior to the connection process in response to a communication instruction, but a search for acquiring information of connection destinations that can be connected around. It is characterized by that.

  Furthermore, in the above-mentioned invention, the preferable aspect is that the active scan is executed when the wireless connection is established, and the passive scan is executed when the wireless connection is not established. It is characterized by that.

  In order to achieve the above object, according to another aspect of the present invention, in a peripheral device including a wireless communication device, when the wireless communication device searches for a connection destination candidate, wireless connection with any of the connection destinations Depending on whether or not is established, an active scan for performing the search is performed by transmitting search data and receiving response data for the search data, or the notification data received from the surroundings Determining whether to perform a passive scan to search.

  Furthermore, in the above invention, a preferable aspect thereof is that the peripheral device is provided with a wired communication mode and a wireless communication mode, and that the wireless connection is not established, when the peripheral device is in the wired communication mode, Alternatively, the peripheral device is in the wireless communication mode and is not connected to any connection destination.

  In order to achieve the above object, according to another aspect of the present invention, in a wireless communication method in a wireless communication apparatus that mainly performs reception, when searching for a connection destination candidate, a wireless connection with any of the connection destinations Depending on whether or not is established, an active scan for performing the search is performed by transmitting search data and receiving response data for the search data, or the notification data received from the surroundings Determining whether to perform a passive scan to search.

  Further objects and features of the present invention will become apparent from the embodiments of the invention described below.

1 is a diagram illustrating a network configuration according to an embodiment of a printer to which the present invention is applied. FIG. FIG. 2 is a diagram illustrating a functional configuration of a printer. It is the figure which illustrated the connection destination candidate table. 5 is a flowchart illustrating a procedure of search processing performed by the wireless communication unit 14; It is the flowchart which illustrated the procedure of the search process for a state (5).

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the technical scope of the present invention is not limited to these embodiments, but extends to the matters described in the claims and equivalents thereof.

  FIG. 1 is a diagram showing a network configuration according to an embodiment of a printer to which the present invention is applied. The printer 1 shown in FIG. 1 includes a wireless communication device (wireless communication unit 14) to which the present invention is applied, and whether or not the wireless connection is established when searching for connection destination candidates. Accordingly, it is determined whether to perform an active scan or a passive scan, and to perform a search process suitable for the state of the apparatus.

  The printer 1 according to the present embodiment is an example of a peripheral device that is an electronic device equipped with a wireless communication device. As shown in FIG. 1, a plurality of access points (base stations) 2 existing around the printer 1 Wireless communication is possible with a plurality of host computers 3 that are host devices of the printer 1, and wired communication with the host computer 3 is possible via the communication network 4.

  The printer 1 is, for example, a laser printer that receives a print request from the host computer 3 and executes printing according to the request, and a specific internal configuration thereof will be described later.

  The host computer 3 is composed of a personal computer equipped with a driver for the printer 1 and transmits the print request (print data) to the printer 1 wirelessly or by wire as shown in FIG. FIG. 1 illustrates three host computers 3a, 3b, and 3c among a plurality of host computers. The host computer 3a is shown in FIG. 1 as being connected both wirelessly (dashed line) and wired (solid line), but either one of the communication methods is selected and used.

  Next, the access point 2 is a base station that relays communication between the printer 1 and other devices such as the host computer 3, and in the present embodiment shown in FIG. 1, there are five access points 2a and 2b. 2c, 2d, and 2e. Here, it is assumed that the three access points 2a, 2b, and 2c have the same SSID (Service Set ID), and the two access points 2d and 2e have the same SSID.

  FIG. 2 is a diagram illustrating a functional configuration of the printer 1. As illustrated in FIG. 2, the printer 1 includes a controller unit 11, a print execution unit 12, an operation unit 13, a wireless communication unit 14, and the like. Further, as described above, the printer 1 communicates with the host computer 3 through wired communication or wireless communication via the access point 2.

  The controller unit 11 is a so-called printer controller, and holds the print data received from the host computer 3, necessary image processing for the print data, a print instruction to the print execution unit 12, and the printer 1 including the operation unit 13. This is the part that controls each part of the system. Although not shown, the controller unit 11 includes a CPU, RAM, ROM, ASIC, a bus connecting them, and the like.

  The print execution unit 12 is a so-called printer engine, and is a part that executes print processing on a print medium in accordance with a print instruction from the controller unit 11. When the printer 1 is a laser printer, the printer 1 includes a photoconductor, an exposure device, a developing device, an intermediate medium, a fixing device, a printing medium transport device, and the like.

  The operation unit 13 is a part that controls an interface with the user of the printer 1, and includes various buttons for the user to operate, a display for displaying information to the user, and the like. In addition, a list of wireless communication connection destination candidates, which will be described later, is displayed on the display of the operation unit 13, and a connection destination that the user desires to connect to is selected from the list using the button or the like.

  Next, the wireless communication unit 14 is a wireless communication device included in the printer 1, and performs wireless communication with the access point 2 described above and enables communication between the printer 1 and other devices such as the host computer 3. is there. As shown in FIG. 2, the wireless communication unit 14 includes a communication control unit 15 and a communication processing unit 19.

  The communication control unit 15 is a part that controls the communication processing unit 19 that executes actual communication processing, and the communication control unit 15 instructs the above-described connection destination candidate search processing that is a feature of the printer 1. . As shown in FIG. 2, the communication control unit 15 includes a search unit 16, a setting unit 17, a connection unit 18, and the like as a functional configuration, and includes a CPU, a RAM, a ROM, and the like. Note that the processing performed by the communication control unit 15 is mainly executed by the CPU operating in accordance with a program stored in the ROM.

  The search unit 16 is a part that controls the search processing, and the specific processing content will be described later. The setting unit 17 and the connection unit 18 are a part for setting each parameter for wireless communication in the communication processing unit 19 and a part for causing the communication processing unit 19 to execute a connection process with the communication destination (access point 2). It is.

  The communication processing unit 19 is a part that performs wireless communication in accordance with the control of the communication control unit 15, and transmits and receives data to and from the communication destination. Specifically, according to the instruction of the search unit 16, transmission of search data (probe request), reception of response data (probe response), reception of broadcast data, and the like are performed. Further, when establishing a wireless connection, a connection process is executed in accordance with an instruction from the connection unit 18 under the conditions set by the setting unit 17 to establish a wireless connection. Thereafter, communication with the connection destination is performed. The communication processing unit 19 is configured by an ASIC or the like.

  The printer 1 having the above-described configuration is characterized by processing in the wireless communication unit 14, and the specific contents thereof will be described below.

  First, the wireless communication unit 14 periodically executes a connection destination candidate search process in order to always hold information about connectable access points 2 existing in the vicinity. Then, the connection destination candidate information obtained by the search process is stored as the connection destination candidate table 21 in the RAM of the communication control unit 15 described above.

  FIG. 3 is a diagram illustrating the connection destination candidate table 21. The example shown in FIG. 3 is a case where all of the five access points 2a, 2b, 2c, 2d, and 2e shown in FIG. 1 are detected by searching. Information is retained. In the information shown in FIG. 3, information from “SSID” to “radio wave intensity” is usually included in notification data (beacon) periodically transmitted by the access point 2, and includes “WPS ON / OFF” and “WPS”. Information such as “security” may be included in the notification data, but is generally not included in the notification data but is returned when the wireless communication unit 14 requests in a probe request. .

  As described above, since the access points 2a, 2b, and 2c have the same SSID, the same information is held in the SSID of each access point 2 as shown in FIG. 3, and similarly, the access point 2d And 2e SSID hold the same information.

  In addition, WPS (WiFi Protected Setup) (registered trademark) is a standard for easily setting up wireless communication with security, and this simple setting allows users to set various complicated parameters. Even if it is not performed, the connection can be established only by performing an easy operation. The “WPS ON / OFF” information is information indicating whether a simple setting instruction according to WPS has been given (ON) or not (OFF). In other words, it corresponds to the simple setting according to WPS at that time. It shows whether it is in a ready state (ON) or not (OFF). “Security for WPS” is information indicating a security method used when communication conforming to WPS is performed. In the example shown in FIG. 3, it is shown that only the access point 2 e is in a state that can cope with simple setting in accordance with WPS. Note that the simple setting using WPS is merely an example, and simple settings according to other standards can be used. In this case, information corresponding to the simple setting is acquired and similarly held.

  As described above, since the connection destination candidate information is held, when the user makes a request from the operation unit 13 described above, the wireless communication unit 14 stores the information on the held connection destination candidates (connection destination candidate table 21). Is displayed on the display of the operation unit 13. In this display, information is displayed to the user in units of SSIDs. Accordingly, in the example shown in FIGS. 1 and 3, two SSIDs and accompanying information are displayed.

  A user who wants to perform wireless communication can instruct connection by selecting a desired connection destination (in this case, an SSID) from the displayed connection destination candidates, and performs the above-described simple setting. If desired, a connection can be instructed by performing a predetermined operation such as pressing a predetermined button.

  Thus, when there is a wireless communication connection instruction from the user, the wireless communication unit 14 executes the search process to determine a connection destination according to the instruction. As a result, if the connection according to the user's instruction is possible, the connection is established, and then necessary communication processing with the communication partner such as the host computer 3 is executed.

  Wireless communication is performed according to the procedure as described above. The wireless communication unit 14 is characterized by the search processing method executed in each scene described above, and the specific contents thereof will be described below. As described above, for the search, a search that is periodically executed to acquire information on surrounding connection destination candidates without intention of a specific connection thereafter (hereinafter referred to as a general search), and thereafter There is a search performed for the connection (referred to here as a connection time search). The general search and the connection search have different needs. Even in the general search and the connection search, the state of the printer 1 at that time varies. Therefore, the wireless communication unit 14 determines a search method based on the state of the printer 1 when the search is performed, and realizes a highly accurate search.

  Specifically, the state when the search is performed is divided into five, and the search is executed using a search method suitable for each state. The five states are as follows.

  State (1): In this state, the printer 1 is used in the wired mode and performs a general search. In other words, a general search is performed when wired communication is being performed and wireless communication is in a disconnected state (connection is not established).

  State (2): In this state, the printer 1 is in the wireless mode, but is not yet connected (connection is not established) and a general search is performed. That is, although it is a mode that uses wireless communication, it is a state in which a general search is performed when wireless communication is not connected.

  State (3): A state in which a general search is performed in a state where the printer 1 is in the wireless mode and is connected to any other party (a state where the connection is established). In other words, the general search is performed in a state where the connection process is performed and the connection is established and data communication is immediately possible.

  State (4): The printer 1 is in the wireless mode and is in a state of connecting to the designated SSID partner. In other words, the connection search is performed when a connection instruction specifying the SSID is made by a user or the like. This state is the state in which the user selects a desired connection destination when the connection destination candidates are displayed on the operation unit 13 as described above.

  State (5): State in which connection with the other party is received in response to the above-described instruction such as simple setting. That is, this is a state in which a search at the time of connection is performed when it is necessary to determine a connection destination based on information that cannot normally be obtained from notification data (beacon) from a communication partner. In this case, the SSID is not specified in the connection instruction.

  FIG. 4 is a flowchart illustrating the procedure of the search process performed by the wireless communication unit 14. Hereinafter, the contents of the search process will be described with reference to FIG. First, the communication control unit 15 determines whether or not it is time to search (step S1). Specifically, it is determined whether the execution timing of a general search performed periodically (for example, every 30 seconds) or whether a connection instruction has been made (whether it is the timing to perform a connection search) is determined. If it is determined that the timing is reached (Yes in step S1), the process proceeds to step S2, and if it is determined that such timing is not reached (No in step S1), Wait until it is time.

  In step S2, the communication control unit 15 determines whether the search to be executed is a general search or a connection time search. If the search is a general search (No in step S2), the process proceeds to step S3. If the search is a connection time search (Yes in step S2), the process moves to step S9.

  In step S3, the communication control unit 15 determines whether the printer 1 is in the wired mode at that time. The determination is made by making an inquiry to the controller unit 11. If the wired mode is selected (Yes in Step S3), the process proceeds to Step S4. If the wired mode is not selected (No in Step S3), the process is performed. The process proceeds to step S6.

  When the process proceeds to step S4, it is the case of the state (1) described above, and the search process is executed by the search method defined for the state (1). Specifically, the search is performed by the passive scan described above. Therefore, the communication control unit 15 acquires connection destination candidate information by receiving beacons periodically transmitted by each access point 2. In this state (1), since wired communication is used, even if it takes a long time to search on the wireless communication side, there is no adverse effect, and the search accuracy is improved by using a passive scan with reliable search. Can be made.

  Next, in step S6, the communication control unit 15 determines whether or not the wireless connection is established. If not (No in step S6), the process proceeds to step S7. If connected (Yes in step S6), the process proceeds to step S8.

  When the process proceeds to step S7, it is the case of the state (2) described above, and the search process is executed by the search method defined for the state (2). Specifically, similarly, the search is performed by passive scanning. In this state (2), although wireless mode has not been established yet, the wireless communication has not been performed, so even if the search takes a long time, the wireless communication is not affected. Accuracy can be improved.

  When the process proceeds to step S8, it is the case of the state (3) described above, and the search process is executed by the search method defined for the state (3). Specifically, the search is performed by the active scan described above. More specifically, since it is a general search, in order to perform a broadcast active scan that does not specify a partner, search data (probe request) with unspecified destination is transmitted, and response data (probe response) is received. Get information of connection destination candidates. In this case, in step S5 described later, the information acquired in the previous search and the information acquired in the current search are merged to obtain information in the connection destination candidate table 21. For this purpose, the information acquired this time is also stored in the RAM.

  In this state (3), wireless communication is in a connected state, and it is not possible to know when print data or the like is transmitted from the host computer 3 or the like, and it is not preferable to take a long time for the search. Use active scan. Further, as described above, since active scan has a problem of accuracy, the search accuracy is improved by merging two search results. Note that printers generally do not change their installation positions frequently, so the status of the surrounding connection destinations is rarely changed in a short time, and information is inaccurate even if the above information is merged. There is little possibility of becoming.

  In general, printers often receive data, and it is difficult to actively control communication timing. Therefore, even if the printer is not actually in communication, it can always be connected. Since communication may start, it is meaningful to use an active scan that does not take time in this state (3) so as not to disturb the communication.

  Next, in step S9, the communication control unit 15 determines whether or not the connection instruction that causes the search is to specify an SSID, and when the SSID is specified (step S9). Yes), the process proceeds to step S10, and if the SSID is not designated (No in step S9), the process proceeds to step S11.

  When the process proceeds to step S10, it is the case of the state (4) described above, and the search process is executed by the search method defined for the state (4). Specifically, the search is performed using an active scan designating an SSID. At that time, the waiting time of the probe response returned in response to the probe request is set to be longer than in the normal case.

  In this state (4), since the search is performed at the time of connection and connection processing must be performed after the search, an active scan that can be performed in a short time is adopted, and further, the accuracy problem due to the active scan is improved by extending the waiting time. doing.

  Next, when it transfers to step S11, it is a case of the state (5) mentioned above, and a search process is performed by the search method defined for the state (5). Here, a method using both active scan and passive scan is used, and the specific contents thereof will be described later.

  As described above, when the search process is completed in each case, the process proceeds to step S5, and the communication control unit 15 holds the information obtained by the search process in the connection destination candidate table 21 as the latest information. Thereafter, the process returns to step S1, and the same process is repeated.

  FIG. 5 is a flowchart illustrating the procedure of the search process for the state (5). In the search for the state (5), the communication control unit 15 first executes an active scan that does not designate an SSID (step S111). Here, a description will be given of processing when simple setting by WPS is instructed by the user.

  Therefore, in the active scan, since it is necessary to know whether or not the simple setting by WPS is valid in the access point 2 as the connection destination, the search data (“WPS ON / OFF” information described above) is obtained. (Probe request) is transmitted to an unspecified destination. In this way, normally, an active scan is performed to obtain predetermined information that is not included in the beacon from the access point 2.

  As a result of the active scan, the communication control unit 15 determines whether there is data in which “WPS ON / OFF” is “ON” in the response data received from the access point 2 (step S112). Is detected (Yes in step S112), the connection can be made to the access point 2 that transmitted the data, and the search process is terminated. For example, in the example shown in FIG. 3, if response data from the access point 2e is received, the search process is terminated and a connection process with the access point 2e is performed.

  On the other hand, if data that is “ON” is not detected (No in step S112), the communication control unit 15 performs a passive scan (step S113). That is, a beacon transmitted from each access point 2 is received for a predetermined period.

  Thereafter, the communication control unit 15 determines whether there is data in which “WPS ON / OFF” is “ON” in the notification data received from the access point 2 (step S114). If data that is “ON” is detected as a result of the determination (Yes in step S114), connection can be made to the access point 2 that transmitted the data, and the search process ends. As described above, the “WPS ON / OFF” information is not normally included in the beacon, but depending on the access point 2, a beacon including this information may be transmitted, and at this time, the beacon is “ON”. Data may be detected.

  On the other hand, if data that is “ON” is not detected (No in step S114), the communication control unit 15 has detected a new access point 2 that was not detected during the active scan in step S111 by the passive scan. It is determined whether or not (step S115).

  As a result, when a new access point 2 is detected (Yes in step S115), the communication control unit 15 performs an active scan specifying an SSID (step S116). Specifically, the search point (probe request) having one of the SSIDs detected in the active scan (S111) and the passive scan (S113) as a response destination is transmitted, and the access point 2 having the SSID is transmitted. Response data from is received.

  Then, the communication control unit 15 determines whether there is data in which “WPS ON / OFF” is “ON” in the response data received from the access point 2 (step S117). If it is detected (Yes in step S117), connection can be made to the access point 2 that transmitted the data, and the search process is terminated.

  On the other hand, if data that is “ON” is not detected (No in step S117), the communication control unit 15 determines whether or not the active scan in step S116 has been performed for all of the detected SSIDs (step S116). Step S118). If not performed for all (No in step S118), the process is repeated from step S116 for the next SSID.

  After that, if data with “WPS ON / OFF” set to “ON” is not detected and processing is completed for all of the detected SSIDs (Yes in step S118), the processing moves to step S119.

  The active scan (S116) in which the above SSID is specified is preferably executed with priority given to the SSID of the access point 2 newly detected in the passive scan (S113).

  For example, as shown in FIG. 3, when “WPS ON / OFF” is “ON” only in the access point 2e, the access point 2e is not detected in the active scan in S111, and the access point 2e in the passive scan in S113. Is detected, first, as the active scan of S116, one in which the SSID ("xxx") of the access point 2e is designated is executed.

  If no new access point is detected in step S115 (No in step S115), the process proceeds to step S119.

  In step S119, the communication control unit 15 determines whether or not the preset time for the search process for the state (5) has been exceeded in the current search process. (No in step S119), the process from step S113 or the process from step S111 is repeatedly executed. On the other hand, when it exceeds the said time (Yes of step S119), this search process is complete | finished.

  As described above, the wireless communication unit 14 according to the present embodiment determines a search method according to whether or not a wireless connection with any connection destination is established during a general search. If the connection is not established, the passive scan is executed. If the connection is established, the active scan is executed. Since the printer 1 including the wireless communication unit 14 mainly performs reception, the search is completed in a short time using the active scan in a state where the connection is established, thereby hindering reception processing that does not know when it occurs. It is possible to perform a highly accurate search by using a passive scan in a state where a connection is not established and the search can take a long time. Therefore, the wireless communication unit 14 can execute search processing suitable for the state of the apparatus.

  In the description based on FIG. 4, the determination as to whether or not the connection time search is performed (S2) is performed before the determination as to whether or not the wired mode is used (S3). May be reversed. In this case, in the determination of whether or not the wired mode is used, if the result is “Yes”, the process proceeds to S4, and if the result is “No”, whether the search is on-connection. Make a decision. Then, when the result of the determination is “No”, the process proceeds to S6, and when the result is “Yes”, the process proceeds to S9.

  In addition, the state (5) described above includes not only the case of connection by simple setting, but also the case of connecting a connection destination that is not an access point (communication destination connected in ad hoc mode) to function as an access point. .

  Also, as shown in FIG. 1, in the present embodiment, the connection destination of the printer 1 is the access point 2, but the connection destination is not limited to this, and the connection destination has a wireless communication function such as another printer. Other electronic devices may also be used.

  In the present embodiment, the electronic apparatus to which the present invention is applied is a laser printer, but other electronic apparatuses such as an ink jet printer and a projector may be used.

  The protection scope of the present invention is not limited to the above-described embodiment, but covers the invention described in the claims and equivalents thereof.

  DESCRIPTION OF SYMBOLS 1 Printer, 2 Access point (2a, 2b, 2c, 2d, 2e), 3 Host computer (3a, 3b, 3c), 4 Communication network, 11 Controller part, 12 Print execution part, 13 Operation part, 14 Wireless communication part , 15 communication control unit, 16 search unit, 17 setting unit, 18 connection unit, 19 communication processing unit, 21 connection destination candidate table.

Claims (6)

A wireless communication unit for performing wireless communication;
A control unit for controlling the wireless communication unit,
When the control unit causes the wireless communication unit to search for a connection destination candidate, when the wireless connection with any of the connection destinations is established, the control unit executes the first scan, and When the wireless connection is not established, a second scan is executed that requires a longer time for searching than the first scan. In claim 1,
The search is not a search that is performed prior to connection processing upon receiving a communication instruction, but a search for acquiring information about connection destinations that can be connected to the surroundings. In claim 1 or 2,
The first scan is a search performed by transmitting search data and receiving response data for the search data. The second scan is performed by receiving notification data transmitted from the surroundings. A wireless communication apparatus characterized by being a search. A peripheral device comprising a wireless communication device,
The wireless communication device
A wireless communication unit for performing wireless communication;
A control unit for controlling the wireless communication unit,
The control unit causes the wireless communication unit to search for connection destination candidates, and when the wireless connection with any of the connection destinations is established, causes the first scan to be executed,
When the wireless connection with any one of the connection destinations is not established, the second scan is executed, which takes a longer time for the search than the first scan. In claim 4,
The peripheral device is provided with a wired communication mode and a wireless communication mode,
The wireless connection is not established when the peripheral device is in the wired communication mode, or when the peripheral device is in the wireless communication mode and is not connected to any connection destination. Peripheral device. A wireless communication method in a wireless communication device for performing wireless communication,
When searching for a connection destination candidate, if a wireless connection with any one of the connection destinations is established, the first scan is executed, and if a wireless connection with any one of the connection destinations is not established, A wireless communication method characterized by executing a second scan that takes a longer time to search than the first scan.

Images