(PCF中文)2007119163812.pdfVIP

Vol.16, No.7 ?2005 Journal of Software 软 件 学 报 1000-9825/2005/16(07)1296 具有最低竞争吞吐率保证的准入控制算法 ? 付晓蕊, 张连芳+ (天津大学 计算机科学与技术系,天津 300072) An Admission Control Algorithm with Minimum Contending Throughput Guarantee FU Xiao-Rui, ZHANG Lian-Fang+ (Department of Computer Science and Technology, Tianjin University, Tianjin 300072, China) + Corresponding author: Phn: +86-22 Fax: +86-22 E-mail: lfzhang@, Received 2003-12-22; Accepted 2004-08-10 Fu XR, Zhang LF. An admission control algorithm with minimum contending throughput guarantee. Journal of Software, 2005,16(7):1296?1304. DOI: 10.1360/jos161296 Abstract: In this paper, the performance of integrating real-time and non real-time traffic in the PCF (point coordination function) mode of IEEE 802.11 is studied, and a novel real-time traffic admission control algorithm is proposed. By changing the admission threshold dynamically according to the current load of non real-time traffic and polling the admitted real-time nodes according to their service index, the proposed algorithm can provide parameterized QoS (quality of service) for real-time traffic, while at the same time, keep the throughput of non real-time traffic at an acceptable level. The validity of the admission control algorithm is verified by simulation. Key words: IEEE 802.11; PCF (point coordination function); QoS (quality of service); admission control 摘 要: 研究了 IEEE 802.11 PCF(point coordination function)机制下集成实时业务和非实时业务的性能,提出 了一种新的实时业务准入控制算法.该算法根据网络中的非实时业务负载情况动态计算准入阈值,并对准入的 实时业务结点按服务指标进行轮询,从而在对实时业务提供参数化 QoS(quality of service)的同时,使非实时业务 吞吐率保持在可接受的水平上.仿真实验验证了算法的有效性. 关键词: IEEE802.11;PCF(point coordination function);QoS(quality of service);准入控制 中图法分类号: TP393 文献标识码: A 近年来,随着无线局域网(wireless local area network,简称 WLAN)的高速发展和 IEEE 802.11 标准的不断普 及,如何在 WLAN 中为有严格实时要求的业务提供服务质量保证引起了人们的广泛关注. IEEE 802.11 标准定义了两种通道访问机制[1]:分布式协调功能(distributed coordination function,简称 DCF) 和点协调功能(point coordination function,简称 PCF).DCF 通过 CSMA/C