无线网状网多源多径组播P2P流媒体分发

Multi-source Multi-cast P2P Streaming Delivery in Wireless Mesh Networks

由于无线网络相邻链路间信号相互干扰,无线网状网中P2P流媒体分发不能直接利用现有有线网络P2P流媒体分发的调度算法.为提高无线网状网P2P流媒体分发质量,通过引入流媒体传输率失真模型和组播无线信号干扰模型,提出一种跨层多源多径组播调度策略,并采用改进的遗传算法对该策略进行实现.与多源多径单播调度算法相比,由于多源多径组播调度算法利用了无线网络实质采用广播方式传输数据的特点,能有效的减少流媒体数据传输冲突概率.仿真实验表明,多源多径组播调度算法更能有效的提高无线网状网P2P流媒体分发质量.

Wireless interference makes simultaneous use of some adjacent links impossible,it is impractical to adopt the P2P streaming delivery scheme used in conventional wired networks to wireless mesh networks.In order to improve the quality of P2P streaming delivery over wireless mesh networks,by integrating the wireless interference model and media streaming rate-distortion model into consideration,the cross-layer multi-source multi-path multicast scheme is proposed and the genetic algorithm is employed to implement the scheme.Comparing to the multi-source multi-path unicast scheme,the multi-source multi-path multicast scheme adopts the wireless networks＇ character that the data is transmitted by broadcasting and can effectively decrease the streaming transmitting interfering probability.The simulation results shows that the multi-source multi-path multicast scheme can effectively decrease the total rate-distortion of P2P media streaming delivery over wireless mesh networks by comparing to the multi-source multi-path unicast scheme.