摘要
视频点播系统中的节点可以在任意时刻选择任意视频并进行拖放等交互式操作,在这一操作过程中会产生播放延迟,影响用户观看满意度,为保证播放流畅性以提高用户满意度,节点需要快速响应该行为产生的查找目的片段请求,在P2P VoD中有效的节点组织策略是实现节点快速定位目的节点的关键.所提策略利用视频片段关联性这一特点,不去具体挖掘各个片段之间关联性强度,使有相似兴趣爱好的节点自组织在一起以实现快速查找目的片段;对该策略引出的节点邻居优化问题,给出近似优化算法.仿真对比实验表明了该策略在降低跳播观看时延和提高系统可扩展性上的有效性.
Peers in a video-on-demand system can choose any vedio at any time do interactive operations, such as play forward or backward. The interactive action may induce the play back delay which can influence users＇ viewing experience, in order to ensure the playback continuity, it is essential for peers who do interactive operations to hit the destination segment as fast as possible. In P2P VoD, an efficient peer organization strategy is necessary for peers to fast locate the destination segment. Based on the character that the segments of on-demand streaming have some relevance with each other, this paper proposes a self-organization strategy for peers, which in stead of digging the specific relevancy of different segments makes peers of similar interest organize together to realize fast locate the destination segment. The optimization problem about how to optimize peer＇s neighborlist is induced by the proposed strate- gy, an approximate optimization algorithm is presented to solve the problem. The simulation results show that the given strategy can effectively reduce the seeking delay and enhance the scalability of the system.
出处
《小型微型计算机系统》
CSCD
北大核心
2013年第2期205-209,共5页
Journal of Chinese Computer Systems
基金
河南省教育厅信息化工程项目(2008XXH001)资助
河南省教育厅创新人才工程项目(2011HASTIT003)资助
