Performance Enhancement and Bandwidth Guarantee in IEEE 802.11 Wireless LANs

作     者：YongPeng Shi-DuanCheng 

作者机构：NationalLaboratoryofSwitchingTechnologyandTelecommunicationNetworksBeijingUniversityofPostsandTelecommunicationsBeijing100876P.R.China 

出 版 物：《Journal of Computer Science & Technology》 (计算机科学技术学报（英文版）)

年 卷 期：2004年第19卷第2期

页      面：150-157页

核心收录：

学科分类：080904[工学-电磁场与微波技术] 0810[工学-信息与通信工程] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 080402[工学-测试计量技术及仪器] 0804[工学-仪器科学与技术] 081001[工学-通信与信息系统] 

基　　金：国家自然科学基金 国家高技术研究发展计划(863计划) 高等学校博士学科点专项科研项目 

主　　题：IEEE 802.11 performance enhancement bandwidth guarantee 

摘      要：This paper first revisits the previously proposed NSAD (New Self-Adapt DCF) mechanism. Some modifications are presented to further enhance the performance of NSAD in the error-prone environment. Then a new MAC mechanism is proposed that can realize bandwidth guarantee by assigning different self-adapt parameters to users at different priority levels. The bandwidth guarantee property of this new mechanism is analyzed and the high priority users are found to have bandwidth guaranteed even in heavy contention condition, which is proved true not only by theoretical analysis but also by simulation results. At the same time the new scheme keeps the self-adapt character of NSAD, so the overall system utilization is kept very high in heavy contention condition compared with the previously studied DCF-based QoS mechanisms.