自适应IEEE802.11PCF调度算法  

Adaptive Scheme on IEEE 802.11 PCF

作　　者：廖勇[1] 杨士中[1] 徐昌彪[1] 

机构地区：[1]重庆大学通信工程学院,重庆400044

出　　处：《计算机科学》2007年第12期46-47,55,共3页Computer Science

基　　金：国家发改委CNGI2005示范工程项目(CNGI-04-4-2D);重庆市教委科学技术研究项目(040507);重庆市科委自然科学基金项目(CSTC;2006BB2164)

摘　　要：本文在研究现有无线局域网IEEE802.11PCF(Point Coordination Function)调度算法基础上,提出一个自适应PCF算法的解决方案。该算法通过使用队列调度来实现CFP(Contention Free Period)阶段PC和站点之间的消息服务,站点之间的服务顺序可以根据实时需求动态改变;对来自站点大量高速率发送的数据,调度器采用队列缓冲区尾部丢弃策略来缓解网络拥塞。通过对比定性的分析了此算法与单轮询算法在CFP帧传输的性能差异,得到在系统吞吐率以及平均包延迟上本文提出的算法能提供更好的QoS。On the basis of WLAN IEEE802. 11PCF （Point Coordination Function）schemes in this paper, an adaptive PCF scheme is proposed for un-solved problems. It deals with message service between PC and stations by queue scheme during the CFP（Contention Free Period）, the service orders among the stations can change with the real time requirement dynamically. For the large quantity of messages sent by the stations in high speed, the system is appointed to ease network congestion by discarding the tail part of queue buffer. According to the comparison and qualitative analysis of this scheme and single poll scheme, which are different from each other on the performance of CFP frame transmit. The result is that a better QoS of the system throughput rate as well as average packet delay will be provided by the scheme proposed in this paper.

关 键 词：无线局域网 PCF 自适应 队列调度 丢弃策略 QOS 

分 类 号：TP301.6[自动化与计算机技术—计算机系统结构]