基于请求响应控制机制的数据调度策略

现有P2P流媒体系统的调度策略大多在请求端进行数据调度，在响应端则采用简单的先来先服务或最小时限优先响应的响应策略，其缺点是优先级较高的请求在响应时未必被优先响应。为此，综合考虑数据块的紧迫性、稀缺性以及请求节点的带宽，提出一种基于请求响应控制机制的数据调度策略(DSBRC)。与现有的数据调度策略相比，DSBRC提高系统上行带宽利用率，同时缩短节点启动时延和提高节点播放质量。

Data Schedule Strategies Based on Request Response Control Mechanism

Almost all existing schedule strategies only schedule data requests at request peers, and adopt simple response strategies such as First Come First Service(FCFS) or Early Deadline First Response(EDFR) at response peers. The drawback is that the high priority data requests may not be given priority to, when peers response to data requests. So that data schedule can not achieve the expected target. This paper takes the urgency and rarity of the request data blocks, as well as the bandwidth of request peers into consideration, and proposes a Data schedule Strategy Based on Response Control mechanism(DSBRC). Compared with the existed data schedule strategies, DSBRC can enhance the utilization of upload bandwidth of the system, at the same time, shorten the start-up delay and improve the playback quality of peers.