【作者】 李强；

【导师】 张晋豫；

【作者基本信息】 北京交通大学 ， 计算机科学与技术， 2010， 硕士

【摘要】 大规模P2P (Peer-to-Peer)流媒体应用中,由于客户端的异构性、分布式和用户行为的个性化、随机性带来了QoS (Quality of Service)维护问题和扩展性问题。本论文主要研究优化的P2P流媒体网络的信令协议。通过研究基于超网的P2P网络分布式重叠拓扑(Overlay Topology)构架和信息模型,建立具有位置意识的P2P分布式重叠拓扑构造和维护机制；通过研究用户的普遍网络意识和行为,提出节点服务能力效用分类算法,建立基于Polling的具有位置意识(Local-Awareness)、QoS意识(QoS-Awareness)、信任意识(Trust-Awareness)、奖励意识(Award-Awareness)、同步意识(Synchronization-Awareness)、开销意识(Cost-Awareness)的服务节点(Serving Peer)选择和调整机制,解决了当前P2P网络中存在的拓扑不匹配问题,实现小世界网络(Small World),提高QoS的保证能力；通过研究基于超级管理节点服务能力的资格分类算法,建立超级节点的选举和维护机制；通过研究节点的失效和性能评估算法,建立业务信息和性能信息同步机制,解决了P2P网络的扩展性问题和可靠性问题。以上问题的解决,将有力的推动流媒体业务在宽带网络和数字电视网络上的开展和普及。更多还原

【Abstract】 In the large-scale P2P (Peer-to-Peer) streaming applications, the heterogeneous and distributed clients as well as the different and random behavior of user lead to the problems of QoS maintenance and scalability.This paper will focus on the QoS mechanisms of high-performance P2P streaming network. A construction and maintenance mechanism of distributed position-aware P2P overlay topology is established, based on the study of supernet based P2P distributed network overlay topology architecture and information model. By researching the users’ general awareness and behaviors on the network, an effective node service capabilities classification algorithm is developed, and a Polling-based Serving Peer selection and adjustment mechanism with Local-Awareness, QoS-Awareness, Trust-Awareness, Award-Awareness, Cost-Awareness and Synchronization-Awareness is established, which can solve the problem of P2P network topology mismatch, and can realize the Small World and improve the QoS ability. A qualification classification algorithm based on the capacity of super manager node is developed, and a maintenance and election mechanism for super-nodes is established. By researching the node’s failure and performance evaluation algorithms, a synchronization mechanism for traffic information and performance information is developed, which can greatly improve the P2P network scalability and reliability.The work of this paper will effectively promote the development of streaming media in the broadband networks and digital television networks更多还原