摘要
定量分析了WFQ在不同信道利用率情况下和各等级业务负载分布变化时的性能变化。研究发现 ,WFQ本身具有一定的抗高等级业务突发的能力 ,其性能不仅与业务负载分布有关 ,而且与信道利用率和各服务等级权值之间的比例关系有关。提出了一种基于测量的可变权值的WFQ调度算法 ,根据信道利用率和各等级负载分布的变化调整各等级的权值。最后通过仿真 ,将这两种算法在比例区分服务模型PDS(ProportionalDif ferentiatedService)下进行了比较。仿真结果证明基于测量的WFQ在各等级业务负载正常分布的情况下性能比WFQ更好 ,在保持高等级业务的时延和时延抖动很小的情况下 。
As an important algorithm to implement QoS, the performance of WFQ under load distribution varying has not been quantitatively analyzed. This paper discusses this point and discovers that its performance is not only related with the load distribution, but also with link utilization and the ratio of successive classes' weight. Measurement based WFQ is proposed to overcome WFQ's shortcomings. At last, compared with WFQ, the simulation results show that the measurement based WFQ has a better performance and can adapt to the distribution varying.
出处
《高技术通讯》
EI
CAS
CSCD
2002年第7期28-33,共6页
Chinese High Technology Letters
基金
86 3计划 ( 86 3 317 0 3 0 3 99)
国家自然科学基金 ( 6 9872 0 2 8)资助项目
