摘要
目的解决P2P点播系统中数据可用性和流媒体QoS的问题。方法通过有效的节点选择算法,研究点播场景下传统节点选择方案的局限性,提出了一种适用于混合式P2P点播流媒体系统的两阶段节点选择算法TSPS,算法的第一阶段根据缓存状态确定可用节点组,第二阶段根据带宽、延迟以及丢包率等QoS参数确定最优节点组。结果给出了算法的分析和实现步骤,从服务器负载、启动延迟、网络吞吐量和消息开销等方面对所提出的算法进行了仿真试验。结论通过对仿真试验结果的比对分析,表明所提出的节点选择算法性能良好。
Aim Using efficient peer selection algorithm to solve the problems of data availability and QoS of streaming in P2P on-demand streaming media system. Methods Through analysis of the limitation of existing peer selection algorithms propose a two-stage peer selection （TSPS） algorithm of hybrid P2P on-demand media streaming system. The first stage determines available peers according to peers＇ cache states as well as the second stage determines the most suitable peers according to peers＇ bandwidth, delay and loss rate. Results The algorithm＇s scheme and analyses are given, and the simulation experiment is carried out from aspects of server stress, start delay, throughput and total message number. Conclusion Through simulation and comparison, performance of TSPS was found well.
出处
《西北大学学报（自然科学版）》
CAS
CSCD
北大核心
2008年第2期199-202,216,共5页
Journal of Northwest University（Natural Science Edition）
基金
陕西省国际科技合作重点基金项目(2006KW-21)
陕西省教育厅产业化重点基金项目(05JC27)
