无线Mesh网络中基于业务价值的组播带宽分配方案

高延迟及低效益是无线Mesh网络中开展流媒体业务面临的主要问题。为解决该问题,首先赋予组播业务价值,该值反映了业务的网络优先级及效益优先级,并提出一个基于组播价值优先级的组播带宽分配方案。该方案第一阶段实施基于价值优先级的不区分业务类型的静态分配,通过对高价值业务的优先调度,实现了组播价值最大化及带宽效益最大化。在拥塞时,实施第二阶段的基于业务带宽需求调整及抢占的动态分配,保证了低时延约束业务的服务质量。仿真与常见算法的比较表明,所提出的方案在保证业务网络服务质量的同时,能实现带宽效益最大化。

A bandwidth allocation scheme based on service value for multicast in wireless mesh networks

High delay and low benefit are essential problems when streaming media services run in wireless mesh networks. To solve these problems, we propose a value priority based bandwidth allocation scheme for multicast, and the value corresponding to each multicast session is calculated by priority weigh metric which captures the networks priority and benefit priority of services. The scheme first carries out static scheduling based on the value priority of multicast services regardless of their types, and this step can achieve the maximum value of multicast and the maximum benefit of bandwidth by offering the higher value service prior scheduling. When networks congestion occurs, the following dynamic scheduling based on the adjustment of bandwidth requirement and preemptive procedure is carried out, which offers QoS guarantee for applications with low delay constraint. Simulation results show that compared with the existing algorithms, the proposed scheme cannot only offer QoS guarantee for applications, but also achieve the maximum bandwidth benefit.