Research on HCCA mechanism of wireless LAN access

Computer Engineering and Applications ›› 2011, Vol. 47 ›› Issue (5): 69-72.

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Research on HCCA mechanism of wireless LAN access

LIANG Hua¹，HU Zhigang²

1.Hunan International Economics University，Changsha 410205，China
2.School of Software，Central South University，Changsha 410075，China

Received:1900-01-01 Revised:1900-01-01 Online:2011-02-11 Published:2011-02-11

无线局域网HCCA接入机制研究

梁华¹，胡志刚²

1.湖南涉外经济学院，长沙 410205
2.中南大学软件学院，长沙 410075

Abstract

Abstract: The Quality Of Service（QOS） scheduling mechanism of IEEE802.11e is analyzed，and the simple scheduling algorithm（Simple Scheduler） and its deficiencies existing in supporting Variable Bit-Rate service（VBR） are discussed.And then an improved algorithm which adapts to the real time VBR service is proposed.The algorithm can dynamically adjust the service interval and the TXOP of per flow.Finally，the algorithm on NS2 is implemented.Compared with the HCCA，simulation results show that this mechanism effectively improves the delay and transmission efficiency.

Key words: wireless local area network, service interval, duration

摘要： 分析IEEE802.11e的服务质量（QOS）调度机制，讨论了IEEE802.11e协议给出的简单调度算法（Simple Scheduler）及其支持可变比特速率业务（VBR）时存在的不足。对简单调度算法进行了改进，提出一种适用于实时VBR业务的调度算法，该算法可以动态地调整服务间隔、每个业务流的发送机会周期（TXOP）。在NS网络模拟器上实现了适用于VBR业务的HCCA调度算法，并进行模拟仿真，对两种调度算法的性能进行比较。仿真结果表明，该机制有效改善了延时和传输效率。

关键词: 无线局域网, 服务间隔, 持续时间

LIANG Hua¹，HU Zhigang². Research on HCCA mechanism of wireless LAN access[J]. Computer Engineering and Applications, 2011, 47(5): 69-72.

梁华¹，胡志刚². 无线局域网HCCA接入机制研究[J]. 计算机工程与应用, 2011, 47(5): 69-72.

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Research on HCCA mechanism of wireless LAN access

无线局域网HCCA接入机制研究

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