P2P流媒体系统的激励机制  

Incentive mechanisms in P2P streaming systems

作　　者：秦丰林[1,2] 江林 葛连升[2] 

机构地区：[1]山东大学信息科学与工程学院,山东济南250100 [2]山东大学网络与信息中心,山东济南250100 [3]山东山大鸥玛软件有限公司,山东济南250100

出　　处：《山东大学学报（理学版）》2010年第3期29-33,40,共6页Journal of Shandong University(Natural Science)

基　　金：国家自然科学基金资助项目(60773101;60872024);山东省自然科学基金资助项目(Y2007G42)

摘　　要：目前P2P流媒体技术已经成为Internet上大规模流媒体应用的最流行的实现方案,但其服务质量会受到搭便车问题的影响。本文提出了一种基于内容差分服务的激励机制,该机制根据节点的贡献值和节目的流行度两个因素来计算节点的信誉,节目列表服务器按照节点的信誉值返回相应的节目列表,这样可以实现内容差分服务以避免搭便车问题。仿真结果表明,该激励机制可以有效提高视频播放质量。Recently peer-to-peer（P2P） streaming media technology has been of the most popular solution for large-scale streaming applications over the Internet,but its quality of service（QoS） can be seriously degraded by the free-riding problem.In this paper,a content differentiation service（CDS） based incentive mechanism was proposed,wherein the peer＇s reputation was computed with two factors：its contribution level and the popularity of the program,then a differentiated program list was returned to the peer in accordance with its reputation value.Hence,the free-riding problem could be restrained by the implementation of content differentiation service.The simulation results demonstrate that the proposed incentive mechanism can efficiently improve the playback quality in P2P streaming systems.

关 键 词：P2P流媒体 搭便车 激励机制 内容差分服务 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]