JP2016149648A5 - COMMUNICATION DEVICE, COMMUNICATION METHOD, AND PROGRAM - Google Patents

Description

In order to achieve the above object, the communication device of the present invention is a first communication that uses the first bandwidth and uses the first channel, and does not allow communication that uses the first bandwidth. There is a first period of switching to another channel in order to search for a wireless network, and when the wireless network is detected, a report is sent to the device that has constructed the wireless network used when performing the first communication A first communication means for performing the first communication with a second period to be transmitted, and a second communication using a second bandwidth narrower than the first bandwidth, wherein the report is A second communication unit that performs the second communication that is not transmitted; a selection unit that selects the first communication unit or the second communication unit based on information related to streaming communication; and a selection unit that selects the second communication unit. And a control means for controlling so as to communicate with other communication devices in the communication means.

As described above, in the present embodiment, when continuous data communication is performed, either the HT20 mode or the HT40 mode is selected according to the video allowable delay time. As a result, when delay is not allowed, the buffer size is not increased in order to temporarily prevent image disturbance in the OBSS scan, but the video delay is reduced by operating in the HT20 mode. On the other hand, when the delay is allowed, the bandwidth is widened by connecting in the HT40 mode so that a higher quality image is transmitted. By providing a buffer size more than the time required for the OBSS scan, the video can be reproduced without being disturbed even if the frame cannot be received during the OBSS scan.

When the HT20 mode is set, the sink 101 starts the OBSS scan, and during that time, the video frame cannot be received and the video is not disturbed. For this reason, the Source 102 sends a buffer size reduction request to the Sink 101 giving priority to the real-time property (S1521). When the sink 101 receives the buffer size reduction request, the sink 101 reduces the buffer size (S1522). Since the signal bandwidth is reduced due to the HT20 mode, the Source 102 transmits AV Format Change defined by Wi-Fi Display when the bandwidth is insufficient for high-quality video. As a result, the source 102 notifies the sink 101 that data with reduced image quality is to be transmitted (S1523). This does not necessarily have to be transmitted as described above. Thereafter, the source 102 continues to transmit the video frame as RTP data to the sink 101 (S1524).

Next, a processing flow in the wireless communication system according to the present embodiment will be described with reference to FIG. FIG. 17 is a sequence diagram showing a flow of a series of processing for mirroring the screen of the source 102 with the sink 101 by Wi-Fi Display. In FIG. 17, the source 102 operates in the role of a P2P GO. Note that, as an initial state in FIG. 17, it is assumed that a menu screen in which real-time property is important is displayed in the source 102.

<< Other Embodiments >>
In each of the above-described embodiments, Wi-Fi Display has been described as an example. However, when video streaming is distributed by other methods instead of Wi-Fi Display, each of the above discussions can be applied.

Claims (20)

A first communication that uses a first bandwidth and uses a first channel and switches to another channel to search for a wireless network that does not allow communication using the first bandwidth. And the first communication has a second period in which a report is transmitted to a device that has constructed a wireless network used when the first communication is performed when the wireless network is detected. A first communication means for performing
A second communication using a second bandwidth narrower than the first bandwidth, the second communication means for performing the second communication in which the report is not transmitted;
Selection means for selecting the first communication means or the second communication means based on information relating to streaming communication;
Control means for controlling the communication means selected by the selection means to communicate with another communication device;
A communication apparatus comprising: The communication device according to claim 1 , wherein the selection unit selects the second communication unit based on the streaming communication being performed . The communication device according to claim 1 , wherein the selection unit selects the first communication unit based on the fact that the streaming communication is not performed . When the streaming communication is performed and a predetermined time equal to or exceeding the time corresponding to the first period does not exceed a delay time allowed in the streaming communication, The communication apparatus according to claim 1 , wherein the first communication unit is selected . 5. The communication apparatus according to claim 4 , wherein the selection unit selects the second communication unit when the streaming communication is performed and the predetermined time exceeds the delay time . 6. The communication apparatus according to claim 4 , wherein the delay time is notified from a partner apparatus that performs the streaming communication . 6. The communication apparatus according to claim 4 , wherein the delay time is determined based on data communicated in the streaming communication . The communication apparatus according to claim 1 , wherein the selection unit selects the first communication unit or the second communication unit based on a type of data communicated in the streaming communication . 9. The communication apparatus according to claim 8 , wherein the selection unit selects the second communication unit based on the fact that the type is a type for which real-time property is required . 10. The communication apparatus according to claim 8, wherein the information related to the type is notified from a partner apparatus of the streaming communication . Wherein the first bandwidth is a 40 MHz, the communication device according to any one of claims 1 to 10, wherein the second bandwidth is 20MHz. If the communication device is a device that participates in a wireless network that is used when the first communication means communicates and the communication device performs the first communication, the communication device switches to the other channel. the communication apparatus according to any one of claims 1 to 11, characterized in that the transmission of the report. The communication device receives the report when communicating by the first communication means and the communication device is a device for constructing a wireless network used when the first communication is performed. The communication device according to any one of claims 1 to 12. When the communication device communicates with the other communication device by the second communication means, and is a device that participates in a wireless network used when performing the second communication,
  The control means transmits a request signal for requesting that the communication device performs the first communication by the first communication means, and receives a response signal for the request signal from the other communication device. The communication apparatus according to any one of claims 1 to 13, wherein the second communication unit is switched to the first communication unit based on the above. When the communication device is communicating with the other communication device by the second communication means, and is a device that has built a wireless network to be used when performing the second communication,
  The control means is based on receiving a request signal for requesting to perform the first communication by the first communication means from the other communication device and transmitting a response signal to the request signal. The communication apparatus according to any one of claims 1 to 14, wherein the second communication unit is switched to the first communication unit. The communication apparatus according to any one of claims 1 to 15, wherein the streaming communication is communication used for the communication apparatus to perform mirroring conforming to a Wi-Fi Display standard. The communication device according to any one of claims 1 to 16, wherein the first communication and the second communication are communication conforming to a Wi-Fi Direct standard. The first communication is a communication for performing an OBSS (Overlapping Basic Service Set) scan,
The communication apparatus according to claim 1, wherein the second communication is communication that does not perform the OBSS scan. Switch to another channel to search for a wireless network that uses the first bandwidth and uses the first channel and does not allow communication using the first bandwidth. There is a first period, and when the wireless network is detected, there is a second period in which a report is transmitted to a device that has constructed a wireless network used when performing the first communication. And the second communication using the second bandwidth that is narrower than the first bandwidth, and the second communication in which the report is not transmitted. A selection step of selecting based on information relating to streaming communication performed by;
A control step for controlling the first communication device and the second communication device to communicate with each other in the first communication or the second communication selected in the selection step;
A communication method characterized by comprising: The program for functioning a computer as each means of the communication apparatus as described in any one of Claims 1-18.