利用基于测量的 WFQ 实现比例区分服务 模型及其性能分析.pdf

第 3 期 电

子

学

报 Vol. 30
No. 3

WFQ ( Weight Fair Queuing) , a typical PFQ ( Packet Fair Queuing) algorithm, is analyzed and simulat
ed. The result shows that WFQ has certain resistibility to the burst of higher priority traffic has better resistibility under
medium load than in heavy load, and the larger the ratio of weights of successive queues, the stronger the resistibility of WFQ. Finally,
a new measurement
based WFQ ( M
WFQ) is proposed. The performances of long
term and short
term of M
WFQ with BPR, WTP, and
WFQ are given. The results show that M
WFQ has the best performance under normal traffic distribution reasonably and can be adap
tive to variation of traffic load distribution.
Key words:
QoS; PDS; WFQ; measurement
based WFQ
1
引言 区分服务希望通过半 静态的 资源预 约提供 端到端服 务质量,

因特网的飞速发展促使它转变成一个能提供多等级服务 主要有两种方法: 费用服务和有保证的服务. 它的缺点是实现
质量的网络. 目前, 提供服务质量的网络结构和协议主要有两 复杂.
种: 资 源 预 约/ 集 成 业 务 ( RSVP/ IntServ, Resource ReSerVation 相对区分服务的宗 旨是高 等级业 务的服 务质量 好于, 至
Protocol/ Integrated Service) [ 1, 2] 和 区 分 服 务 ( DS, Differentiated 少不差于低等级业务的服务质量 . 它没有资源预约,