A d Hoc网络具有网络拓扑结构动态变化的特点,而且网络中的源节点与目的节点间通常存在多条路径.因此A d Hoc网络中的路由协议必须适应网络的动态性且充分利用有效的多条路径.文中基于动态源路由协议DSR,提出了一种基于移动节点移动预...A d Hoc网络具有网络拓扑结构动态变化的特点,而且网络中的源节点与目的节点间通常存在多条路径.因此A d Hoc网络中的路由协议必须适应网络的动态性且充分利用有效的多条路径.文中基于动态源路由协议DSR,提出了一种基于移动节点移动预测和多路径路由机制的路由协议PM DSR.该协议可根据移动节点的位置、速度和移动方向等信息,对相邻节点的链路最大生存时间进行预测,并选择相对稳定的多条路径投递分组.仿真结果表明,与经典的DSR协议相比,PM D-SR协议可有效地提高分组平均投递率,降低平均端到端时延.展开更多
The best-effort internet has inherent limitations on the end-to-end performance for interactive multimedia communications. This paper presents a multiple description coding （MDC） and forward error correction （FEC）...The best-effort internet has inherent limitations on the end-to-end performance for interactive multimedia communications. This paper presents a multiple description coding （MDC） and forward error correction （FEC） based multiple path transmission schemes for interactive multimedia （M3FEC）, which improves the end users’ experience by maximizing a rate-distortion （R-D） based optimization problem. The proposed model considers both the network diversity and the application’s stringent requirements, and combines the individual merits of the three promising technologies of multiple path overlay routing, MDC and FEC. Extensive numerical analysis and PlanetLab experiments demonstrate that M3FEC successfully combats packet losses, error propagation, and unpredictable network dynamics. This method also significantly increases distortion for interactive multimedia by over 10 dB than traditional IP-layer single path transmission in poor network environments, and outperforms the performance achieved by using MDC or FEC alone.展开更多
文摘A d Hoc网络具有网络拓扑结构动态变化的特点,而且网络中的源节点与目的节点间通常存在多条路径.因此A d Hoc网络中的路由协议必须适应网络的动态性且充分利用有效的多条路径.文中基于动态源路由协议DSR,提出了一种基于移动节点移动预测和多路径路由机制的路由协议PM DSR.该协议可根据移动节点的位置、速度和移动方向等信息,对相邻节点的链路最大生存时间进行预测,并选择相对稳定的多条路径投递分组.仿真结果表明,与经典的DSR协议相比,PM D-SR协议可有效地提高分组平均投递率,降低平均端到端时延.
基金Supported by the National Natural Science Foundation of China(No.90718040)NEC Laboratories China (No.LC-2008-055)
文摘The best-effort internet has inherent limitations on the end-to-end performance for interactive multimedia communications. This paper presents a multiple description coding （MDC） and forward error correction （FEC） based multiple path transmission schemes for interactive multimedia （M3FEC）, which improves the end users’ experience by maximizing a rate-distortion （R-D） based optimization problem. The proposed model considers both the network diversity and the application’s stringent requirements, and combines the individual merits of the three promising technologies of multiple path overlay routing, MDC and FEC. Extensive numerical analysis and PlanetLab experiments demonstrate that M3FEC successfully combats packet losses, error propagation, and unpredictable network dynamics. This method also significantly increases distortion for interactive multimedia by over 10 dB than traditional IP-layer single path transmission in poor network environments, and outperforms the performance achieved by using MDC or FEC alone.
