Performance Analysis and Improvement About WFQ and WRR Schedule Algorithm

Different multimedia services have different requirement of delay and jitter, it is essential to select an appropriate schedule algorithm to meet the quality of service (QoS) of different multimedia services. Firstly, the impact on performance of delay and fairness of WRR and WFQ algorithm was studied; then, an enhanced WRR (E-WRR) algorithm based on packet length and queue weight was proposed. Simulation results show that when the packet length in different queues are same, almost same delay performance can be approached by both WRR and WFQ; when the packet length in different queues are different, the delay requirement of higher priority queue cannot be approached with WRR algorithm. However, the delay performance of proposed E-WRR algorithm can be close in upon WFQ algorithm, which can guarantee the delay requirement of higher priority queue, and greatly reduce the calculation complexity of schedule algorithm.