Equation based TCP-friendly rate control (TFRC) protocol has been proposed to support video streaming applications. In order to improve TFRC performance in wireless channels, the link level automatic repeat request (A...Equation based TCP-friendly rate control (TFRC) protocol has been proposed to support video streaming applications. In order to improve TFRC performance in wireless channels, the link level automatic repeat request (ARQ) scheme is usually deployed. However, ARQ cannot ensure strict delay guarantees, especially over multihop links. This paper introduces a theoretical model to deduce an equation for packet size adjustment in transport layer to minimize retransmission delay by taking into con- sideration the causative reasons inducing retransmission in link layer. An enhanced TFRC (ETFRC) scheme is proposed inte- grating TFRC with variable packet size policy. Simulation results demonstrate that higher goodput, lower packet loss rate (PLR), lower frame transmission delay and jitter with good fairness can be achieved by our proposed mechanism.展开更多
提出了基于请求迁移的任务调度策略(Request migration based task scheduling,RMTS)算法,当有新请求到达系统时,运行RMTS算法的调度器根据当前负载状态和迁移路径长度决定是否对请求进行迁移,并选择最优迁移路径。当某个媒体服务器出...提出了基于请求迁移的任务调度策略(Request migration based task scheduling,RMTS)算法,当有新请求到达系统时,运行RMTS算法的调度器根据当前负载状态和迁移路径长度决定是否对请求进行迁移,并选择最优迁移路径。当某个媒体服务器出现故障无法提供服务时,调度器将该服务器正在服务的请求迁移到其他存储有相应内容的媒体服务器以保障点播服务不间断。采用请求成功率和服务时延度量系统的性能,仿真结果表明:RMTS算法优于传统迁移算法和REM(Random early migration)算法,服务时延和请求成功率分别提高了14%和15%。展开更多
基金Project supported by the National Natural Science Foundation ofChina (No. 60302004) and the Natural Science Foundation of HubeiProvince (No. 2005ABA264), China
文摘Equation based TCP-friendly rate control (TFRC) protocol has been proposed to support video streaming applications. In order to improve TFRC performance in wireless channels, the link level automatic repeat request (ARQ) scheme is usually deployed. However, ARQ cannot ensure strict delay guarantees, especially over multihop links. This paper introduces a theoretical model to deduce an equation for packet size adjustment in transport layer to minimize retransmission delay by taking into con- sideration the causative reasons inducing retransmission in link layer. An enhanced TFRC (ETFRC) scheme is proposed inte- grating TFRC with variable packet size policy. Simulation results demonstrate that higher goodput, lower packet loss rate (PLR), lower frame transmission delay and jitter with good fairness can be achieved by our proposed mechanism.
文摘提出了基于请求迁移的任务调度策略(Request migration based task scheduling,RMTS)算法,当有新请求到达系统时,运行RMTS算法的调度器根据当前负载状态和迁移路径长度决定是否对请求进行迁移,并选择最优迁移路径。当某个媒体服务器出现故障无法提供服务时,调度器将该服务器正在服务的请求迁移到其他存储有相应内容的媒体服务器以保障点播服务不间断。采用请求成功率和服务时延度量系统的性能,仿真结果表明:RMTS算法优于传统迁移算法和REM(Random early migration)算法,服务时延和请求成功率分别提高了14%和15%。
