P2P视频会议系统中的媒体流组播树的生成与维护  

Construction and Maintenance of the Multicast Tree for a P2P Video-conferencing System

作　　者：靳志峰[1] 周兵 张宏坡[1] 

机构地区：[1]郑州大学信息工程学院,郑州450001 [2]河南省高校信息网络重点学科开放实验室,郑州450052

出　　处：《计算机科学》2007年第8期134-137,201,共5页Computer Science

基　　金：中国国家自然科学基金(60075006);河南省高校杰出人才创新工程项目资助

摘　　要：P2P的技术把视频会议服务器的功能分散到客户端,从而解决视频会议系统中存在的网络和系统资源瓶颈问题。本文综合利用P2P技术和传统视频会议的优点,提出一种有中心管理服务器的P2P视频会议系统结构,并对节点间的数据交互和控制机制进行了研究。根据当前的Internet跨网段间不支持IP层组播的实际情况,提出在局域网内采用IP组播、在子网间采用单播的应用层组播方式进行媒体流传输。考虑P2P网络中每个节点都有自治的、动态的、自利的等特性,本文提出一种基于投标-招标机制的媒体流组播树的生成与维护算法。As video severs＇ tasks are distributed to its clients in P2P systems, a P2P based video conferencing system is able to solve the bottleneck problem of network and system resources. Taking advantage of P2P technology and traditional video conferencing systems, a P2P based video conferencing architecture is proposed and a new scheme of peer management and communication is put forward in this paper. Considering the fact that Internet can＇t support IP-layer multicasting between LANs, media-stream transmission adopts IP layer multicasting only within a LAN, and application-layer multicasting between LANs. According to autonomation, dynamic, selfishness of peers in P2P systems, a new algorithm for constructing and maintaining muticasting tree is designed with the principle of invitation and bidding.

关 键 词：P2P 视频会议 应用层组播 流媒体传输 

分 类 号：TP393.4[自动化与计算机技术—计算机应用技术]