一种适合实时变比特率视频传输的IP区分服务调度算法

在建立的区分服务网络模型的基础上，提出一种针对实时变比特率突发业务的调度算法，称为加权开关赤字轮循(weighted switch deficit round robin，WSDRR)算法．根据不同的队列等级分配加权的带宽，并根据队列中分组状况动态调节服务量．该策略是针对网络拥塞下传输实时突发视频业务而提出的．基于一种吞吐量公平测度的比较，WSDRR算法与传统赤字轮循DRR算法具备相同的公平性．实验结果表明，与DRR算法相比，WSDRR算法能够降低实时突发视频业务的端对端延时和延时抖动，从而进一步使实时视频传输的要求得到满足．

A Novel Scheduling Algorithm for Real-Time VBR Video Transmission over IP DiffServ Networks

In this paper, a novel differentiated service scheduling algorithm based on the transmission condition is introduced The proposed scheduling scheme, called weighted switch deficit round robin (WSDRR), categorises the different frame types of compressed video which are handled in separate queues and prioritizes time sensitive and visually important data WSDRR also introduces an overdraft threshold that basically allows a packet to be scheduled even if its flow's deficit is not large enough in a given scheduling round By numerical experiments, WSDRR achieves better delay and delay jitter performance than the DRR scheduling algorithm Hence the delay and jitter can further meet the requirement for real time VBR video transmission