具负载平衡之IPTV影音串流系统

摘要

Since the video media has wide band width,the improvement of QoS (quality of service) of IPTV system de⁃pends on effective management of video servers. A video replication and access request distribution algorithm to implement a load balanced IPTV system with replica servers is proposed in this paper. The proposed algorithm is based on the more replicas for hot program and load distribution among replica servers. By comparing with two other algorithms,the proposed algorithm fea⁃tures better load balance effects. System practices demonstrate that the access requests can be evenly distributed among replica servers such that a better streaming service can be provided. The proposed algorithm has been implemented on an IPTV system platform. The relative technical issues for the implementation are discussed.%影音媒体具高带宽及实时特性，因此影音串流系统的服务质量的提升端赖影音服务器的有效管理。在此提出一套Video replication及Access request distribution的算法，藉由将热门影音分散到各影音服务器以及影音存取的分散，以达到各影音服务器系统负载平衡的效果。在此比较了3个不同的算法的负载平衡的状况，经实例验证，提出的算法确能达到影音服务器负载平衡的效果，承载更多的系统服务要求。该系统构建在Smart⁃iTV的IPTV系统台，并讨论了实作的相关技术。