A Study on a Set of Media Synchronization Protocols in Wireless Networks

无线网络中一套媒体同步协议的研究

• 批准号: 09650411
• 负责人: TASAKA Shuji
• 金额: $ 2.18万
• 依托单位: Nagoya Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09650411/
• 关键词: wireless network; wireless LAN; PHS; media synchronization; MPEG video; H.263 video; G.726 audio; H.223 Annex; H.223Annex; 無線マルチメディア通信; ビデオ・音声総合伝送

The research results can be classified into five categories. The first study examines four lip synchronization schemes for stored MPEG video and voice ; two schemes interleave voice and video into a single transport stream, and the others treat them separately. In each kind, one exerts synchronization control at the destination, while the other does not. In addition, we apply a dynamic resolution control scheme of MPEG video to the two schemes with synchronization control. We have implemented those schemes on an ALTAIR wireless LAN.The measured performance shows that heavily loaded networks need synchronization control and that the dynamic resolution control is effective.Secondly, we study media synchronization on live MPEG video and voice as in the first study.Thirdly, we propose a joint synchronization scheme among stored video, live voice and live video streams. The scheme takes advantage of the difference in the feature between live and stored media. We have implemented the scheme on an integrated ATM and wireless LAN and demonstrated its effectiveness.The fourth study measures the quality of stored media synchronization under the slide control in PHS Internet access. A simple experimental system was developed for the transmission of H.263 video and G.726 audio from a media server to PHS mobile terminals. We examine the effects of Rayleigh fading in the PHS channels and the data load in the Internet on the media synchronization quality.Lastly, we study the application of the slide control to interleaved transmission of live video and audio specified by the H.223 Annex in PHS.We also propose a QOS control scheme to control both media synchronization quality and transmission delay. Through simulation, we confirm the effectiveness of the scheme. In addition, we carry out an experiment of live G.728 audio transmission with PIAFS and UDP/IP.

研究结果可以分为五类。第一项研究考察了存储MPEG视频和语音的四种唇同步方案；两种方案将语音和视频交织到一个传输流中，其他方案分别处理它们。在每一种类型中，一个在目的地施加同步控制，而另一个则没有。此外，我们将MPEG视频的动态分辨率控制方案应用于这两种方案，并进行同步控制。我们已经在ALTAIR无线局域网上实现了这些方案。实测性能表明，重载网络需要同步控制，动态分辨率控制是有效的。其次，和第一篇研究一样，我们研究了MPEG实时视频和语音的媒体同步。第三，提出了存储视频、实时语音和实时视频流的联合同步方案。该方案利用了实时媒体和存储媒体之间的特性差异。我们在一个集成ATM和无线局域网上实现了该方案，并验证了其有效性。第四项研究测量了小灵通网络接入中滑动控制下存储媒体同步的质量。为实现H.263视频和G.726音频从媒体服务器到小灵通移动终端的传输，开发了一个简单的实验系统。研究了小灵通信道中的瑞利衰落和网络中的数据负载对媒体同步质量的影响。最后，我们研究了滑动控制在小灵通中H.223附件规定的视频和音频直播交错传输中的应用。我们还提出了一种QOS控制方案来控制媒体同步质量和传输延迟。通过仿真验证了该方案的有效性。此外，我们还进行了基于PIAFS和UDP/IP协议的G.728音频实时传输实验。

项目成果

Shuji Tasaka: "Stored Media Synchronization in PHS Internet Access" Conference Record of IEEE GLOBECOM '98. 113-119 (1998)

Shuji Tasaka：IEEE GLOBECOM 98 的“PHS 互联网接入中的存储媒体同步”会议记录。

Masamio Kato: ""Experiment on stored media synchronization over PHS channels"" Transactions of IEICE. 709-719 (1998)

Masamio Kato：“通过 PHS 通道存储媒体同步的实验”IEICE 交易。

Masami Kato: "Performance Evaluation of Media Synchronization in PHS with the H.223 Annex Multiplexing Protocol" IEICE Transactions on Communications. Vol.E81-B,No.12. 2423-2431 (1998)

Masami Kato：“使用 H.223 附件复用协议对 PHS 中媒体同步的性能评估”IEICE 通信交易。

Masami Kato: "Performance Evaluation of Media Synchronization in PHS with the H.223 Annex Multiplexing Protocol" IEICE Transactions on Communications. Vol.E81-B, No.12. 2423-2431 (1998)

Masami Kato：“使用 H.223 附件复用协议对 PHS 中媒体同步的性能评估”IEICE 通信交易。

井上武志: "ライブ及び蓄積メディア同時転送時のメディア同期方式" 電子情報通信学会技術研究報告. CQ98-73 (1998)

Takeshi Inoue：“实时和存储媒体同步传输的媒体同步方法”IEICE 技术研究报告 CQ98-73 (1998)。