JP2015115626A - Source device, sink device, program, and communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a source device which is connectable with the nearest device even when the source device is carried.SOLUTION: A source device includes: a first communication part and a second communication part for radio communication with a source device; a requesting part for letting the first communication part request a connection signal for wireless LAN connection to a plurality of source devices; a determination part for determining a sink device to be a subject to be connected according to a signal strength comparison result of the connection signals when the connection signals are received from a plurality of sink devices through the first communication part; and a connection setting part for wireless LAN connection with the sink device determined as a subject to be connected using the second communication part.

Description

  The present invention relates to setting up a peer-to-peer wireless communication.

  Conventionally, peer-to-peer wireless communication for performing wireless communication between devices without using a device such as a wireless router is known. As such peer-to-peer wireless communication, IEEE. There is known WiFi Direct established by the WiFi Alliance based on the 802.11 standard. With WiFi Direct, if the other device is located in the communicable area of one device, wireless communication can be performed using the communication function of the device.

  With WiFi Direct, it is necessary to make settings including address information and security settings between a source device and a sink device before performing wireless communication between devices.

  Patent Document 1 discloses a method for automatically searching for a device to be connected before the device performs peer-to-peer wireless communication connection. In this search method, first, the device measures the signal strength of the probe response output from the devices existing around it. Next, the device creates a table for setting the connection order in the order of signal strength. The device then connects to the device based on the table created by the search method described above (see, for example, Patent Document 1).

JP 2013-162381 A

  If the device is portable, the user may want to connect to the nearest device that he has carried. However, the connection method disclosed in Patent Document 1 defines the connection priority order on the assumption that the device does not move. Therefore, when the user moves the device and connects the device at a new location, the searched device may not be a connection destination device intended by the user.

  The present invention has been made in view of the above problems, and provides a source device that can be connected to the nearest device even when the device is carried.

  In order to solve the above problems, in one aspect of the present invention, a source device that performs peer-to-peer wireless communication with a sink device, the first communication unit that performs wireless communication with the source device, and the second communication unit A request unit that requests the first communication unit to connect to the plurality of source devices for wireless LAN connection, and the connection signal from the plurality of sink devices through the first communication unit. A determination unit that determines a sink device to be connected based on a comparison result of signal strengths of the connection signal, and the sink device that is determined as a connection target and the second communication unit A connection setting unit for performing a wireless LAN connection.

In the invention configured as described above, the request unit causes the first communication unit to request a connection signal for performing wireless LAN connection to a plurality of source devices. In addition, when the determination unit receives connection signals from a plurality of sink devices through the first communication unit, the determination unit determines a sink device to be connected based on the signal strength of the connection signal.
Therefore, even when the source device is moved, it is possible to connect to the nearest sink device based on the signal strength of the connection signal performed with the surrounding devices.

In the aspect of the invention, the determination unit performs a comparison based on a change in signal strength of the connection signal, and sets a sink device that outputs the connection signal whose signal strength increases as a connection target. To do.
In the invention configured as described above, the sink device at the optimum position can be set as the connection target in accordance with the direction of movement of the user.

In the aspect of the invention, when the request unit detects a beacon issued from the source device, the request unit causes the first communication unit to request the connection signal.
In the invention configured as described above, the present invention can be applied even when the sink device emits a beacon.

Further, in one aspect of the present invention, it has a motion detection unit for detecting the amount of motion of the source device, the request unit, when a change in the amount of motion of the source device is detected by the motion detection unit, The first communication unit is made to request the connection signal.
In the invention configured as described above, the state where the source device moves can be detected by the motion detection unit.

Furthermore, according to an aspect of the present invention, the communication control unit includes a communication control unit that transmits video data to the sink device based on the wireless LAN connected by the connection setting unit.
In the invention configured as described above, when video data is transferred to the sink device, the video can be displayed on the nearest sink device according to the movement of the user.

In one aspect of the present invention, the request unit requests the connection signal from a plurality of source devices after the wireless LAN is connected with the first sink device, and the determination unit includes: The sink device to be switched is determined based on the signal strength of the connection signal, and the connection setting unit disconnects the connection with the first sink device and then determines the second sink to be switched. Wireless LAN connection is performed using the device and the second communication unit.
In the invention configured as described above, even when the source device is connected to the sink device, the connection can be switched to another sink device as the user moves. As a result, it is not necessary for the user to perform an operation for switching connections, and the burden on the user can be reduced.

  The present invention can also be understood as an invention of a sink device connected to a source device. That is, in one aspect of the present invention, a sink device that performs peer-to-peer wireless communication with a source device, the third communication unit that performs wireless communication, the fourth communication unit, and the connection output from the source device In response to the request, a response unit for outputting a connection signal for performing the wireless communication connection with the source device from the third communication unit, and a connection from the source device based on the output connection signal A connection setting unit configured to perform connection using the source device and the fourth communication unit when a request signal is received.

Furthermore, the present invention can be understood as an invention of a program that causes a source device to establish a peer-to-peer wireless communication connection with a sink device.
The present invention can also be understood as a communication system having a sink device and a source device that performs peer-to-peer wireless communication with the sink device.

1 is a diagram showing a configuration of a communication system 100. FIG. 2 is a functional block diagram illustrating functions of the communication system 100. FIG. 2 is a diagram illustrating a hardware configuration of a user terminal 10. FIG. It is a figure which shows the hardware constitutions of the display apparatus 30 (50). 4 is a flowchart for explaining a wireless LAN construction process realized by the communication system 100. It is a sequence diagram explaining the process performed between a user terminal and a display apparatus. It is a sequence diagram explaining the process performed between a user terminal and a display apparatus. It is a figure explaining the determination process performed in step S3. It is a figure explaining the communication system of 2nd Embodiment. It is a sequence diagram explaining the process (connection request | requirement) performed between the user terminal 10 and the display apparatuses 30 and 50 in 2nd Embodiment. It is a figure explaining the communication system 100 concerning 3rd Embodiment. It is a flowchart explaining the process in 3rd Embodiment. 12 is a sequence showing processing performed between the user terminal 10 and the display devices 30 and 50 in the connection request (step S21) and the determination of the connection target (step S22) in FIG. 12 is a sequence showing processing performed between the user terminal 10 and the display devices 30 and 50 in the connection request (step S21) and the determination of the connection target (step S22) in FIG.

Hereinafter, embodiments of the present invention will be described in the following order.
1. First embodiment:
(1) Configuration of communication system (2) Wireless LAN construction processing Second embodiment:
3. Third embodiment:
4). Other embodiments:

1. First embodiment:
(1) Configuration of Communication System FIG. 1 is a diagram illustrating a configuration of a communication system 100. The communication system 100 includes a user terminal 10 as a source device and display devices 30 and 50 as single devices. The user terminal 10 and the display devices 30 and 50 can perform peer-to-peer communication.

  In the communication system 100, the user terminal 10 can automatically perform connection setting with the nearest sink device (the display device 30 or the display device 50). For example, in FIG. 1, when the user moves from room B to room A, the distance between the user terminal 10 and the display device 30 becomes the shortest, so the user terminal 10 performs connection setting with the display device 30.

  FIG. 2 is a functional block diagram illustrating functions of the communication system 100. The user terminal 10 has functions of a request unit 11, a determination unit 12, a connection setting unit 13, a communication control unit 14, a first communication unit 15, and a second communication unit 16. The display device 30 (50) has the functions of a response unit 31, a connection setting unit 32, a communication control unit 33, a third communication unit 34, and a fourth communication unit 35. Note that the display device 50 has the same functions and hardware configuration as the display device 30, and thus description thereof is omitted.

  In connection setting in the communication system 100, first, the request unit 11 of the user terminal 10 makes a connection request to the display devices 30 and 50 using the first communication unit 15. In the display devices 30 and 50, when the connection request is received by the third communication unit 34, the response unit 31 outputs a connection signal in response to the response. When the user terminal 10 receives the connection signal from the display device 30 and the display device 50 through the first communication unit 15, the determination unit 12 determines whether the signal strength of the connection signal is compared with the sink device (display device). The display device 30 (FIG. 1) to be connected is determined.

  Then, the connection setting unit 13 of the user terminal 10 performs connection setting with the display device (connection setting unit 32) determined as the connection destination. In this connection setting, the second communication unit 16 and the fourth communication unit 35 are used. Thereafter, the communication control unit 14 performs peer-to-peer wireless communication based on the wireless LAN established with the sink device (the display device 30 in FIG. 1).

  FIG. 3 is a diagram illustrating a hardware configuration of the user terminal 10. In the present embodiment, the user terminal 10 can perform a mirroring process for transferring (transmitting) video data based on a wireless LAN connected to the display device 30 (50). For example, the user terminal 10 is realized by a smartphone, a portable PC, or the like.

  The user terminal 10 includes a first communication unit 15, a second communication unit 16, an operation unit 17, a motion sensor (motion detection unit) 18, a CPU 19, a RAM 20, a memory 21, a buffer memory 22, and a bus 23. Each unit is connected through the bus 23 and can communicate with each other.

  Both the first communication unit 15 and the second communication unit 16 are realized by a wireless communication IF capable of performing wireless communication according to WiFi Direct. The first communication unit 15 and the second communication unit 16 are connected to the CPU 19 through the bus 23, and can convert a request from the CPU 19 into a radio signal and output it. The first communication unit 15 and the second communication unit 16 receive a radio signal transmitted from the display device 30 (50), convert the radio signal into an electric signal, and then perform the CPU 19 through the bus 23. Can be sent to.

  In addition, when the user terminal 10 performs the mirroring process, the first communication unit 15 and the second communication unit 16 transmit and receive a wireless signal in which video data is combined. That is, a wireless signal transmitted through a wireless LAN or the like is received by the first communication unit 15. When the first communication unit 15 extracts the video signal from the wireless signal, the first communication unit 15 performs analog / digital conversion on the video signal and outputs the video signal to the buffer memory 22 through the bus 23. When the CPU 19 reads the video data recorded in the buffer memory 22, the CPU 19 transfers the video data to the display device 30 (50) through the second communication unit 16.

  Furthermore, the first communication unit 15 and the second communication unit 16 have a function of detecting signal strength. For example, the function of measuring signal strength is RSSI (Received Signal Strength Indicator).

The operation unit 17 includes a touch panel that receives an operation by the user and operation keys.
The motion sensor 18 can detect a change in the amount of motion of the user terminal 10 when the user terminal 10 is moved.

In the memory 21, an application program AP and a registration table RD are recorded. The CPU 19 implements the functions of the request unit 11, the determination unit 12, the connection setting unit 13, and the communication control unit 14 illustrated in FIG. 2 by developing and executing the application program AP in the RAM 20.
The registration table RD records registration information of the display devices 30 and 50 that are targets of WiFi direct communication. For example, a device name, a device MAC address, and a device type are recorded in the registration table RD.

  FIG. 4 is a diagram illustrating a hardware configuration of the display device 30 (50). The display device 30 includes a third communication unit 34, a fourth communication unit 35, a CPU 36, a RAM 37, a ROM 38, a display controller 39, a buffer memory 40, a display display 41, and a bus 42.

  Both the third communication unit 34 and the fourth communication unit 35 can perform wireless communication according to WiFi Direct. The third communication unit 34 and the fourth communication unit 35 are connected to the CPU 36 through the bus 42. Therefore, the third communication unit 34 and the fourth communication unit 35 can convert the request output from the CPU 36 into a radio signal and output it. The third communication unit 34 and the fourth communication unit 35 receive a radio signal transmitted from the user terminal 10, convert the radio signal into an electric signal, and then transmit the radio signal to the CPU 36 through the bus 42. be able to.

  In addition, when the display device 30 (50) performs mirroring with the user terminal 10, the wireless signal transmitted from the user terminal 10 is received by the fourth communication unit 35. Then, when the fourth communication unit 35 extracts the video signal from the wireless signal, the fourth communication unit 35 performs analog / digital conversion on the video signal and outputs the video signal to the buffer memory 40 through the bus 42.

  Then, the display controller 39 reads the video data from the buffer memory 40 and generates a drive signal based on the read video data. The drive signal is an analog signal for driving the display display 41. The display 41 is a liquid crystal display, for example, and has a number of pixels arranged vertically and horizontally according to the resolution. Then, the display 41 drives the pixels based on the drive signal output from the display controller 39 and displays an image.

  The ROM 38 stores a program (not shown). The CPU 36 develops and executes the program recorded in the ROM 38 in the RAM 37, thereby realizing the functions of the response unit 31, the connection setting unit 32, and the communication control unit 33 shown in FIG.

(2) Wireless LAN Construction Process FIG. 5 is a flowchart for explaining the wireless LAN construction process realized by the communication system 100.

  In the process shown in FIG. 5, first, the user terminal 10 registers the display devices 30 and 50 (step S1: registration process). In this registration process, the registration information of the display devices 30 and 50 is recorded in the registration table RD recorded by the user terminal 10. For example, communication processing using a beacon is performed between the user terminal 10 and the display devices 30 and 50, and the device name, MAC address, and device type are recorded in the registration table RD. Note that any other registration method may be used.

  Next, the user terminal 10 makes a connection request to each of the display devices 30 and 50 recorded in the registration table RD (step S2). Next, the user terminal 10 determines that the display device 30 (50) to be connected is based on the comparison result of the signal strength of the connection signal (probe response) returned from the display devices 30 and 50 in response to the connection request. Determination is made (step S3). Next, the user terminal 10 performs connection setting with the connection target determined in step S3 (step S4).

  When the connection with the display device is completed and the user selects to execute the mirroring process by operating the user terminal 10 (step S5: YES), between the user terminal 10 and the display device 30 (50). A mirroring process is performed (step S6).

  Next, each process shown in steps S2-S4 of FIG. 5 will be described in detail. 6 and 7 are sequence diagrams illustrating processing performed between the user terminal and the display device. The processing shown in FIGS. 6 and 7 specifically shows an example of the processing performed in steps S2 to S4 in FIG.

First, when the registration process is completed (step S1 in FIG. 5), the user terminal 10 discloses a connection request to the nearest device (step S2).
In the connection request, first, a connection request (connection request) using the first communication unit 15 is output from the user terminal 10 to peripheral devices. In this connection request, first, the CPU 19 (request unit 11) of the user terminal 10 requests a connection request from the first communication unit 15 (step S2-1). This connection request is a radio signal that returns a connection response to the sink devices (display devices 30 and 50) located in the communicable area of the user terminal 10. Therefore, the first communication unit 15 outputs a connection request in response to a request from the CPU 19 (step S2-2).

  In the display devices 30 and 50, when receiving the connection request, the third communication unit 34 transmits a connection response to the CPU 36 (step S2-3). When receiving the connection request, the CPU 36 (response unit 31) requests a connection response from the third communication unit 34 (step S2-4). The connection response is a radio signal that notifies the user terminal 10 of connection permission. Therefore, the third communication unit 34 outputs a connection response addressed to the user terminal 10 (step S2-5).

  In the user terminal 10, when the first communication unit 15 receives the connection response, the first communication unit 15 transmits the connection response to the CPU 19 (step S2-6). The first communication unit 15 returns the signal strength of the connection response to the CPU 19 together with the connection response. The CPU 19 (determination unit 12) that has received the connection response determines the sink device (display devices 30 and 50) that is the connection destination based on the signal strength of the connection response (step S3).

  FIG. 8 is a diagram illustrating the determination process executed in step S3. FIG. 8 is a graph in which the horizontal axis represents time and the vertical axis represents the signal strength (amplitude) of the connection response. FIG. 8A shows a change in connection response output from the display device 30. FIG. 8B shows a change in connection response output from the display device 50. In the connection response shown in FIG. 8A, the signal strength increases with time. On the other hand, in the connection response shown in FIG. 8B, the signal strength decreases with time. As shown in FIG. 1, when the user moves from the room B to the room A, the distance between the user terminal 10 and the display device 30 approaches, while the distance between the user terminal 10 and the display device 50 increases. This is because they are moving away.

  CPU19 (determination part 12) determines the display apparatus used as connection object based on the change of signal strength. In the first embodiment, the determination unit 12 determines that a display device (in FIG. 8, the display device 30) that outputs a connection response that has a signal strength that is greater than or equal to an acceptable threshold and increases with time is a connection target. To do. That is, in the comparison of the signal strength, even when the connection response from the display device 50 is higher than the connection response from the display device 30, the connection response in which the signal strength connection is increased (FIG. 8A) is determined. .

When the display device to be connected (display device 30 in this example) is determined by the determination process (step S3), the CPU 19 (connection setting unit 13) of the user terminal 10 performs connection setting for performing wireless communication ( FIG. 5: Step S4). In this connection setting, first, the CPU 19 (connection setting unit 13) creates an SSID (Service Set Identifier). Then, the CPU 19 (connection setting unit 13) records setting information necessary for wireless communication such as the created SSID, password, and IP address in the memory 21 (step S4-1).
Here, the SSID is information for identifying a wireless LAN constructed between the user terminal 10 and the display device 30.

  Next, the CPU 19 (connection setting unit 13) requests the second communication unit 16 to transmit a notification signal notifying that a wireless LAN has been established at the wireless layer level (step S4-2). The communication unit 16 outputs a notification signal addressed to the display device 30 (step S4-3).

Thereafter, the CPU 19 (connection setting unit 13) starts security information setting by a WPS (Wi-Fi Protected Setup) method (step S4-4). Therefore, security setting is performed between the user terminal 10 and the display device 30 (step S4-5).
In this way, a wireless LAN is established between the user terminal 10 and the display device 30.

  Thereafter, when the user selects the mirroring process (FIG. 5, step S5: YES), the second communication unit 16 between the communication control unit 14 of the user terminal 10 and the communication control unit 33 of the display device 30; Mirroring processing using the fourth communication unit 35 is performed (FIG. 5, step S6).

As described above, in the first embodiment, even when the user terminal (source device) 10 is moved, the signal strengths of the connection signals output from the surrounding sink devices are compared, and the nearest sink Can connect with device.
In addition, a comparison is made based on a change in the signal strength of the connection signal, and the sink device that outputs the connection signal whose signal strength increases is selected as the connection target, so that an optimal response can be made according to the user's movement. Devices can be connected.

2. Second embodiment:
In the second embodiment, when the display devices 30 and 50 are in the standby mode, a beacon is output at a predetermined cycle, and the user terminal 10 is configured to make a connection request when detecting a beacon as in the first embodiment. Different.

  FIG. 9 is a diagram illustrating the communication system according to the second embodiment. Also in the second embodiment, the user terminal 10 and the display devices 30 and 50 are located in the room. Further, the user terminal 10 and the display devices 30 and 50 can perform wireless communication according to WiFi direct. In addition, the display devices 30 and 50 can switch from the normal mode to the standby mode in which power consumption is lower than that in the normal mode when a predetermined condition is satisfied. In this standby mode, the display devices 30 and 50 output a beacon BE whose wireless signal output level is weaker than the connection response. The beacon is output from the third communication unit 34 at a predetermined cycle. Further, the beacon BE includes the MAC address of the display device 30 (50).

  FIG. 10 is a sequence diagram illustrating a process (connection request) performed between the user terminal 10 and the display devices 30 and 50 in the second embodiment. As with the first embodiment, the user terminal 10 performs wireless LAN construction processing (FIG. 5). The process shown in FIG. 10 shows the connection request in detail in the wireless LAN construction process.

  First, since the display devices 30 and 50 are in the standby mode, the beacon BE is output from the third communication unit 34 (step S12-1). For this reason, when the first communication unit 15 receives the beacon BE, the first communication unit 15 outputs the beacon BE to the CPU 19 (request unit 11) of the user terminal 10 (step S12-2).

  The CPU 19 (request unit 11) analyzes the MAC address included in the beacon BE (step S12-3). When the analyzed MAC address matches the MAC address included in the registration table RD, the CPU 19 (request unit 11) requests a connection request from the first communication unit 15 (step S12-4). ). Therefore, the first communication unit 15 outputs a connection request in response to a request from the CPU 19 (step S12-5).

  In the display devices 30 and 50, when receiving the connection request, the third communication unit 34 transmits a connection response to the CPU 36 (step S12-6). By receiving the connection response, the CPU 36 returns from the standby mode to the normal mode (step S12-7). Then, the CPU 36 (response unit 31) requests a connection response to the third communication unit 34 (step S12-8). Therefore, the 3rd communication part 34 outputs the connection response addressed to the user terminal 10 (step S12-9).

  In the user terminal 10, when the first communication unit 15 receives the connection response, the first communication unit 15 transmits the connection response to the CPU 19 (step S12-10). The first communication unit 15 returns the signal strength of the connection response to the CPU 19 together with the connection response. The CPU 19 (determination unit 12) that has received the connection response determines the sink device (display devices 30 and 50) that is the connection destination based on the signal strength of the connection response (step S3).

  Also in the second embodiment, as in the first embodiment, the display device to be connected is determined according to the signal strength of the connection response (step S3). Then, as in the first embodiment, the CPU 19 (connection setting unit 13) of the user terminal 10 performs connection setting for performing wireless communication with the sink device to be connected (FIG. 5, S4). . Then, when a wireless LAN is established between the user terminal 10 and the display device 30, a mirroring process via the second communication unit 16 and the fourth communication unit 35 is started (FIG. 5, step). S5, S6).

  As described above, in the second embodiment, even when the sink device is in the standby mode, the source device can set the connection with the nearest sink device.

3. Third embodiment:
In the third embodiment, the user terminal 10 is different from the other embodiments in the configuration for switching the connected sink device in accordance with the signal strength.

  FIG. 11 is a diagram illustrating the communication system 100 according to the third embodiment. In FIG. 11, the user terminal 10 and the display devices 30 and 50 are located in the room. In the room A, the user terminal 10 and the display device 30 are located. A wireless LAN according to Wi-Fi Direct is established between the user terminal 10 and the display device (first sink device) 30, and video data is distributed from the user terminal 10 to the display device 30 ( Mirroring). In the room B, the display device (second sink device) 50 is located.

  Assume that the user moves from room A to room B while holding the user terminal 10 in the state shown in FIG. In the third embodiment, the user terminal 10 automatically switches the wireless LAN connection destination from the display device 30 to the display device 50.

  FIG. 12 is a flowchart for explaining processing in the third embodiment. The flowchart shown in FIG. 12 is executed when the motion sensor 18 detects the amount of motion of the user terminal 10.

  First, the user terminal 10 makes a connection request to the display devices 30 and 50 recorded in the registration table RD (step S21). Next, the user terminal 10 determines the connection target based on the connection response returned from the display devices 30 and 50 in response to the connection request (step S22). Next, when the connection target determined in step S22 is different from the current connection target (step S23: YES), the user terminal 10 performs connection setting with a new connection target (step S24). That is, the connection target is switched. On the other hand, when the determined connection target is the same as the current connection target (step S23: NO), the connection target is not switched. In FIG. 11, if the distance between the display device 30 and the user terminal 10 is shorter than the distance between the display device 50 and the user terminal 10, the connection between the user terminal 10 and the display device 30 is maintained.

  Then, after the connection is completed, the mirroring process in which the video data is transferred from the user terminal 10 to the display device 30 (50) is resumed (step S25).

  13 and 14 are sequences showing processing performed between the user terminal 10 and the display devices 30 and 50 in the connection request (step S21) and the connection target determination (step S22) in FIG. 13 and 14, the case where the connection destination of the user terminal 10 is switched from the display device 30 to the display device 50 will be described as an example.

  In FIG. 13, in the connection request (step S21), first, the CPU 19 (request unit 11) of the user terminal 10 requests the first communication unit 15 for a connection request (step S21-1). This connection request is made to the display device 30 that is currently connected to the user terminal 10 in addition to the display device 50. The first communication unit 15 outputs a connection request in response to a request from the CPU 19 (step S21-2).

  In the display devices 30 and 50, when receiving the connection request, the third communication unit 34 transmits a connection response to the CPU 36 (step S21-3). When receiving the connection request, the CPU 36 (response unit 31) requests a connection response from the third communication unit 34 (step S21-4). Therefore, the 3rd communication part 34 outputs the connection response addressed to the user terminal 10 (step S21-5).

  Even in this state, the wireless LAN connection using the second communication unit 16 and the fourth communication unit 35 is maintained between the user terminal 10 and the display device 30.

  In the user terminal 10, when the first communication unit 15 receives the connection response, the first communication unit 15 transmits the connection response to the CPU 19 (step S21-6). The CPU 19 (determination unit 12) that has received the connection response determines whether to switch the connection destination based on the signal strength of the connection response (steps S22 and S23). Hereinafter, a case where the wireless LAN connection is switched from the display device 30 to the display device 50 based on the determination result will be described as an example.

  When the connection target is switched by the determination process (steps S22 and S23) (in this example, the connection target is switched from the display device 30 to the display device 50), the CPU 19 (connection setting unit 13) of the user terminal 10 Is switched (step S24).

  As illustrated in FIG. 14, in the switching process, first, the CPU 19 (connection setting unit 13) requests the second communication unit 16 to disconnect the wireless LAN between the user terminal 10 and the display device 30. (Step S24-1). For this reason, the second communication unit 16 disconnects the wireless LAN established with the fourth communication unit 35 of the user terminal 10 (step S24-2).

  Next, the CPU 19 (connection setting unit 13) of the user terminal 10 creates an SSID for the display device 50 to be newly connected. Then, the CPU 19 (connection setting unit 13) records setting information necessary for wireless communication such as the created SSID, password, and IP address in the memory 21 (step S24-3).

  Next, the CPU 19 (connection setting unit 13) requests the second communication unit 16 to transmit a notification signal notifying that a wireless LAN at the wireless layer level has been constructed (step S24-4). Therefore, the second communication unit 16 outputs a notification signal addressed to the display device 50 (step S24-5).

  Thereafter, the CPU 19 (connection setting unit 13) starts security information setting by the WPS (Wi-Fi Protected Setup) method (step S24-6). Therefore, security setting is performed between the user terminal 10 and the display device 50 (step S24-7).

  In this way, when a wireless LAN corresponding to Wi-Fi Direct is established between the user terminal 10 and the display device 50, mirroring via the second communication unit 16 and the fourth communication unit 35 is performed. The processing is resumed (FIG. 12, step S25).

  As described above, in the third embodiment, even when the source device is connected to the sink device, the connection can be switched to another sink device as the user moves. As a result, it is not necessary for the user to perform an operation for switching connections, and the burden on the user can be reduced.

4). Other embodiments:
There are various embodiments of the present invention.
The use of a user terminal as a source device and a display device as a sink device is merely an example. For example, the source device may be a display device, and video data may be transferred between the display devices.
The use of WiFi Direct for peer-to-peer wireless communication is only an example.
The roles of the first communication unit and the second communication unit may be changed by the CPU.

Needless to say, the present invention is not limited to the above embodiments.
That is,
Applying the combination of the mutually replaceable members and configurations disclosed in the above embodiments as appropriate,
Although not disclosed in the above embodiments, members and configurations that are known techniques and can be mutually replaced with members and configurations disclosed in the above embodiments are appropriately replaced, and combinations thereof are changed. Apply
Although not disclosed in the above-described embodiments, those skilled in the art will appropriately replace the members and configurations that can be assumed by those skilled in the art as substitutes for the members and configurations disclosed in the above-described embodiments. Changing and applying combinations,
Is disclosed as an embodiment of the present invention.

  DESCRIPTION OF SYMBOLS 10 ... User terminal, 11 ... Request part, 12 ... Determination part, 13 ... Connection setting part, 14 ... Communication control part, 15 ... 1st communication part, 16 ... 2nd communication part, 17 ... Operation part, 18 ... Motion sensor, 19 ... CPU, 20 ... RAM, 21 ... Memory, 22 ... Buffer memory, 23 ... Bus, 30 ... Display device, 31 ... Response unit, 32 ... Connection setting unit, 33 ... Communication control unit, 34 ... Third 35 ... fourth communication unit, 36 ... CPU, 37 ... RAM, 38 ... ROM, 39 ... display controller, 40 ... buffer memory, 41 ... display display, 42 ... bus, 50 ... display device, 100 ... Communication system, AP ... Application program

Claims (9)

A source device that performs peer-to-peer wireless communication with a sink device,
A first communication unit that performs wireless communication with the source device, and a second communication unit;
A request unit that causes the first communication unit to request a connection signal for performing wireless LAN connection to a plurality of source devices;
A determination unit that determines a sink device to be connected based on a comparison result of signal strengths of the connection signals when the connection signals are received from a plurality of sink devices through the first communication unit;
A source device comprising: the sink device that is determined as a connection target; and a connection setting unit that performs a wireless LAN connection using the second communication unit.   The determination unit performs a comparison based on a change in signal strength of the connection signal, and targets a sink device that outputs the connection signal whose signal strength increases as a connection target. The source device according to 1.   The request unit, when detecting a beacon issued from the source device, causes the first communication unit to request the connection signal. The source device according to one item. A motion detector for detecting a motion amount of the source device;
The request unit, when the change of the amount of motion of the source device is detected by the motion detection unit, makes the first communication unit request the connection signal. The source device according to claim 3.   5. The source according to claim 1, further comprising a communication control unit that transmits video data to the sink device based on a wireless LAN connected by the connection setting unit. device. The request unit requests the connection signal from a plurality of source devices after connection of the wireless LAN with the first sink device,
The determination unit determines a sink device to be switched based on the signal strength of the connection signal,
The connection setting unit disconnects the connection with the first sink device, and then performs a wireless LAN connection using the second sink device determined as a switching target and the second communication unit. The source device according to any one of claims 1 to 5, characterized in that: A sink device that performs peer-to-peer wireless communication with a source device,
A third communication unit that performs wireless communication, and a fourth communication unit;
In response to a connection request output from the source device, a response unit that outputs a connection signal for performing wireless communication connection with the source device from the third communication unit;
A connection setting unit configured to connect with the source device using the fourth communication unit when a connection request signal is received from the source device based on the output connection signal; Sink device. A program that allows a source device to establish a peer-to-peer wireless communication connection with a sink device,
In the source device,
Causing the first communication unit to request a connection signal for performing wireless LAN connection to a plurality of source devices;
When the connection signals are received from a plurality of sink devices through the first communication unit, the sink device to be connected is determined based on the comparison result of the signal strength of the connection signals,
A program for causing a wireless LAN to be connected using the sink device determined as a connection target and a second communication unit. A communication system comprising a sink device and a source device that performs peer-to-peer wireless communication with the sink device,
The source device is
A first communication unit that performs wireless communication with the source device, and a second communication unit;
A request unit that causes the first communication unit to request a connection signal for performing the wireless communication connection to a plurality of source devices;
A determination unit that determines a sink device to be connected based on a comparison result of signal strengths of the connection signals when the connection signals are received from a plurality of sink devices through the first communication unit;
A communication system comprising: the sink device determined as a connection target; and a connection setting unit configured to connect a wireless LAN using the second communication unit.

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