P2P流媒体网络中基于博弈理论的带宽请求分配策略  

Game Theoretical Bandwidth Request Allocation Policy in P2P Streaming Network

作　　者：陈卓[1,3] 冯钢[1] 周江[1] 周杨[2] 

机构地区：[1]电子科技大学通信抗干扰技术国家级重点实验室,成都611731 [2]佐治亚理工学院计算科学学院,美国亚特兰大30332 [3]重庆理工大学计算机科学与工程学院,重庆400054

出　　处：《电子与信息学报》2013年第7期1725-1731,共7页Journal of Electronics & Information Technology

基　　金：国家自然科学基金重点项目(60833002);国家科技重大专项(2010ZX03003-003);重庆教委科学研究项目(KJ120825)资助课题

摘　　要：基于对等网(P2P)技术的视频流媒体系统以其较低的服务器开销和良好的可扩展性被广泛应用。但由于在这类系统中普遍存在节点的资源及视频播放位置的异构性,使得节点负载不均衡的问题极易发生,进而严重影响到节点的视频播放质量。该文重点研究面向节点负载均衡的节点带宽请求分配策略,将服务请求节点竞争服务提供节点带宽的行为建模为一个非协作博弈,通过寻求该博弈问题的Nash均衡解的方法确定优化的带宽请求分配(GBRA)策略。通过和典型的带宽请求分配策略进行实验对比,数值结果表明该文提出的GBRA策略能有效改善P2P流媒体网络节点负载不均的问题并降低节点获取所需视频数据的平均延迟。Due to the merits of lower bandwidth consumption at streaming server and higher scalability,P2P streaming systems are widely adopted and deployed.However,the heterogeneity of bandwidth resource and playback position at peers may easily lead to load unbalancing problem.This may severely deteriorate video playback quality at peers.This paper focuses on the issue of bandwidth request allocation,aiming at substantially balancing the load at the peers in P2P streaming network.The problem of contending service from multiple neighboring peers is modeled as a non-cooperative game,and the optimal bandwidth request allocation policy,called Game based Bandwidth Request Allocation（GBRA）,is obtained through searching the Nash equilibrium of this game.Numerical results show that the proposed policy can effectively improve the load balancing of the P2P streaming networks and decrease the latency of streaming data retrieval at peers when compared with the classical bandwidth request allocation policies.

关 键 词：对等网(P2P) 视频流媒体 博弈理论 带宽请求分配 

分 类 号：TN915[电子电信—通信与信息系统]