JP2016149648A5 - COMMUNICATION DEVICE, COMMUNICATION METHOD, AND PROGRAM - Google Patents
COMMUNICATION DEVICE, COMMUNICATION METHOD, AND PROGRAM Download PDFInfo
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- JP2016149648A5 JP2016149648A5 JP2015025617A JP2015025617A JP2016149648A5 JP 2016149648 A5 JP2016149648 A5 JP 2016149648A5 JP 2015025617 A JP2015025617 A JP 2015025617A JP 2015025617 A JP2015025617 A JP 2015025617A JP 2016149648 A5 JP2016149648 A5 JP 2016149648A5
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Description
上記目的を達成するため、本発明の通信装置は、第一の帯域幅を利用し第一のチャネルを使用する第一の通信であって、前記第一の帯域幅を利用する通信を許容しない無線ネットワークを検索するために他のチャネルに切り替わる第一の期間があり、かつ、前記無線ネットワークが検出された場合に前記第一の通信を行う際に利用する無線ネットワークを構築した装置へレポートが送信される第二の期間がある前記第一の通信を行う第一の通信手段と、前記第一の帯域幅より狭い第二の帯域幅を利用する第二の通信であって、前記レポートが送信されない前記第二の通信を行う第二の通信手段と、ストリーミング通信に関する情報に基づいて、前記第一の通信手段または前記第二の通信手段を選択する選択手段と、前記選択手段により選択した通信手段で他の通信装置と通信するように制御する制御手段と、を有する。
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.
以上により、本実施形態では、連続的なデータ通信が行われる場合に、映像許容遅延時間に応じて、HT20モードとHT40モードとのいずれかが選択される。これにより、遅延が許されない場合には、OBSSスキャンで一時的に映像の乱れを防ぐためにバッファサイズを大きくするのではなく、HT20モードで動作することで映像の遅延を少なくする。一方で、遅延が許される場合には、HT40モードで接続することによって帯域幅を広くして、より高画質な映像を送信するようにする。そして、OBSSスキャンにかかる時間の分以上にバッファサイズを設けることによって、OBSSスキャン中にフレームが受信できなくても映像が乱れることなく再生することができる。
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.
HT20モードにすると、Sink101がOBSSスキャンを開始して、その間映像フレームを受信できずに映像が乱れることはない。このため、Source102は、リアルタイム性を優先してバッファサイズ縮小要求をSink101に送信する(S1521)。Sink101は、バッファサイズ縮小要求を受信すると、バッファサイズを縮小する(S1522)。HT20モードになり信号帯域幅が小さくなるため、高画質の映像では帯域幅が足りない場合には、Source102は、Wi−Fi Displayで規定されているAV Format Changeを送信する。これにより、Source102は、画質を下げたデータを送信することをSink101に通知する(S1523)。これは上述した通り、必ずしも送信されなくてもよい。その後、Source102は、映像フレームをRTPデータとして、引き続きSink101へと送信する(S1524)。
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).
続いて、本実施形態に係る無線通信システムにおける処理の流れについて図17を用いて説明する。図17はWi−Fi Displayにより、Source102の画面をSink101でミラーリングするための一連の処理の流れを示すシーケンス図である。図17では、Source102が、P2PのGOの役割で動作する。なお、図17の初期状態として、Source102では、リアルタイム性が重要であるメニュー画面が表示されているものとする。
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.
<<その他の実施形態>>
また上述の各実施形態では、Wi−Fi Displayを例に説明したが、Wi−Fi Displayではなく、他の方法により映像ストリーミングが配信される場合に、上述の各議論を適用することもできる。
<< 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)
前記第一の帯域幅より狭い第二の帯域幅を利用する第二の通信であって、前記レポートが送信されない前記第二の通信を行う第二の通信手段と、
ストリーミング通信に関する情報に基づいて、前記第一の通信手段または前記第二の通信手段を選択する選択手段と、
前記選択手段により選択した通信手段で他の通信装置と通信するように制御する制御手段と、
を有することを特徴とする通信装置。 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:
前記制御手段は、前記通信装置が前記第一の通信手段による前記第一の通信を行うことを要求する要求信号を送信し、かつ、前記要求信号に対する応答信号を前記他の通信装置から受信したことに基づいて、前記第二の通信手段から前記第一の通信手段に切り替えることを特徴とする請求項1から13のいずれか1項に記載の通信装置。 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.
前記制御手段は、前記第一の通信手段による前記第一の通信を行うことを要求する要求信号を前記他の通信装置から受信し、かつ、前記要求信号に対する応答信号を送信したことに基づいて、前記第二の通信手段から前記第一の通信手段に切り替えることを特徴とする請求項1から14のいずれか1項に記載の通信装置。 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.
前記第二の通信は、前記OBSSスキャンを行わない通信であることを特徴とする請求項1から17の何れか一項に記載の通信装置。The communication apparatus according to claim 1, wherein the second communication is communication that does not perform the OBSS scan.
前記選択工程において選択した前記第一の通信または前記第二の通信で、前記第一の通信装置と第二の通信装置とが通信するように制御する制御工程と、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;
を有することを特徴とする通信方法。A communication method characterized by comprising:
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