无线Mesh网络中的P2P流媒体性能评价-计算机工程与应用.PDFVIP

Computer Engineering and Applications 计算机工程与应用 2013 ，49 （16） 71 ⦾网络、通信、安全⦾ 无线Mesh 网络中的P2P 流媒体性能评估 1 1 2 刘婷婷 ，杨 维 ，王玉柱 1 1 2 LIU Tingting , YANG Wei , WANG Yuzhu 1.北京交通大学 电子信息工程学院，北京 100044 2.华北计算技术研究所 航空信息系统部，北京 100083 1.Department of Electronic Information and Engineering, Beijing Jiaotong University, Beijing 100044, China 2.Department of Aviatic Information System, North China Institute of Computing Technology, Beijing 100083, China LIU Tingting, YANG Wei, WANG Yuzhu. Performance evaluation of P2P video streaming in wireless mesh networks. Computer Engineering and Applications, 2013, 49 （16）：71-76. Abstract ：A platform of P2P （Peer-to-Peer ）video on demand in wireless mesh networks is established. The four factors which influence video quality are tested on the platform, including encoding and decoding method in application layer, encoding rate, inter-flow interference introduced by P2P mechanism and hop counts. The experiments results show that H.264 encoding is more appropriate for wireless mesh networks and encoding rate must not be greater than network connection speed in order to gain high quality. P2P video quality does not decrease along with network performance when the packet loss rate is smaller than 10%. P2P mechanism introduces 3 dB gain than non-P2P mechanism before the 1,000 th frame, but this advantage vanishes after the 1 000 th frame because of inter-flow interference. The transmission capacity decrease as hop count increases, but this rule is not suitable for P2P video performance. Key words ：Peer to Peer; wireless mesh networks; performance evaluation 摘 要：通过搭建基于无线Mesh 网络的P2P 流媒体点播测试平台，对影响无线Mesh 网络中P2P 流媒体性能的流媒体编解 码方式、编码速率、数据转发路径的选择和跳数四个因素进行了测试。实验结果表明，采用H.264 编解码标准更适合无线 Mesh 网络中流媒体的传输；编码速率必须不大于网络连接速率才能获得高视频质量；P2P 技术可以抵抗10% 的丢包对视 频质量的影响，比采用非P2P 技术在视频的前1 000 帧视频质量平均高出3 dB ；由于P2P 技术带来的流间