一种可控P2P文件下载算法  

An Algorithm for Controllable P2P File Downloading

作　　者：庞涛[1] 黄海[1] 龙斌[1] 武娟[1] 

机构地区：[1]中国电信股份有限公司广东研究院,广州510630

出　　处：《电信科学》2010年第9期111-117,共7页Telecommunications Science

基　　金：国家发改委CNGI示范工程2006年产业化及应用试验资助项目

摘　　要：以BitTorrent为代表的对等网络文件下载时存在带宽吞噬的难题,如何实现可控传输是这类应用可持续发展的必要条件。本文基于电信新业务平台——媒体电信网对可控传输的需求,提出一种可控性对等网络文件下载算法,采用集中式目录服务器传输调度有效限制骨干网负载流量;同时利用基于对等技术的分布式传输,采用空闲终端和补偿服务器相结合的策略进行补偿传输,以保持不低于BitTorrent的下载速率。基于PDNS的数据包级大规模网络并行仿真结果证明了所提出算法的有效性,其综合性能优于BitTorrent算法。Bandwidth devouring has become a significant problem with P2P file downloading applications represented by BitTorrent （BT）. Implementing controllable P2P transfer is a key for sustainable deployment of this type of service. This paper proposes a novel controllable P2P file downloading algorithm based on requirements of new Teleeom service platform--Media Telecom Network （MTN）. This algorithm adoptes centralized directory servers to effectively decrease traffic load of backbone networks. Meanwhile, taking advantage of distributed P2P transfer, the algorithm combines idle terminals and compensation servers to improve downloading rate, which is not worse than BT. Finally, large-scale simulations at packet level based on PDNS prove the effectiveness of the proposed algorithm and show its improvement in terms of overall performance upon BT.

关 键 词：可控对等网 P2P文件下载 BITTORRENT协议 对等节点 

分 类 号：TP393.09[自动化与计算机技术—计算机应用技术]