虚拟载波侦听机制对EDCA性能的影响

doi:10.3969/j.issn.1000-0801.2010.09.030

电信科学 ›› 2010, Vol. 26 ›› Issue (9): 118-122.doi: 10.3969/j.issn.1000-0801.2010.09.030

虚拟载波侦听机制对EDCA性能的影响

张牧¹,严军荣¹

¹ 贵阳学院计算机科学系贵阳550005
² 杭州电子科技大学通信学院杭州310018

出版日期:2010-09-15 发布日期:2010-09-15
基金资助:
国家“863”基金资助项目;国家“863”基金资助项目;江苏省自然科学基金资助项目;贵州省科技厅工业攻关项目;贵阳市人才创新基金资助项目;贵阳市科技局信息化专项项目

Performance Impact of Virtual Carrier Sensing Mechanism on EDCA

Mu Zhang¹,Junrong Yan¹

¹ Department of Computer Science,Guiyang University,Guiyang 550002,China
² Department of Communication Engineering,Hangzhou Dianzi University,Hangzhou 310018,China

Online:2010-09-15 Published:2010-09-15

摘要/Abstract

摘要：

本文研究虚拟载波侦听机制对EDCA机制性能的负面影响。首先指出在RTS/CTS 4次握手不能够完成时，虚拟载波侦听机制中网络分配矢量（NAV）会浪费信道资源；然后讨论了 NAV 设置影响EDCA性能的关键参数，并得出该参数在采用与不采用NAV清除机制以及没有考虑NAV设置影响情况下的取值；最后在不同访问类别（AC）下仿真显示EDCA机制的吞吐性能。很明显，虚拟载波侦听机制的NAV设置对EDCA吞吐性能会产生很大的影响，采用NAV清除机制的性能优于不采用NAV清除机制的性能。

关键词: 无线局域网, EDCA, 虚拟载波侦听, 网络分配矢量

Abstract:

Negative effect of virtual carrier sensing mechanism on EDCA mechanism is elaborated.Network allocation vector （NAV）of virtual carrier sensing mechanism is indicated that which waste channel resource in the case of uncompleted RTS/CTS four-way handshake.Then the key parameters which effect on the performance of EDCA are discussed and the value of the parameters are deduced under the condition of NAV settings with or without NAV clear mechanism,without consideration of NAV negative effect.At last,simulations show the throughput of EDCA in different access categories（AC）.Apparently the NAV settings of virtual carrier sensing mechanism brought big effect on the throughput of EDCA,and that with NAV clear mechanism is better than that without NAV clear mechanism.

Key words: wireless local area network, enhanced distributed channel access, virtual carrier sensing, network allocation vector

张牧,严军荣. 虚拟载波侦听机制对EDCA性能的影响[J]. 电信科学, 2010, 26(9): 118-122.

Mu Zhang,Junrong Yan. Performance Impact of Virtual Carrier Sensing Mechanism on EDCA[J]. Telecommunications Science, 2010, 26(9): 118-122.

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参考文献 13

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数据帧有效载荷：8 184 bit
MAC header:256 bit	信道速率：11 Mbit/s
PHY header: 192 bit	传播时延：1 μs
ACK:112 bit+PHY header	时隙：20 μs
PTS:160 bit+PHY header	SIFS:10 μs
CTS:112 bit+PHY header	DIFS/AIFS:50 μs

数据类型	优先型	AC=j	CW_0,j	CW_m,j	AIFS[AC
音频	最高	3	7	127	50 μs
视频	较高	2	15	255	50 μs
尽力服务	较低	1	31	511	70 μs
后台服务	最低	0	63	1 023	70 μs

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虚拟载波侦听机制对EDCA性能的影响

Performance Impact of Virtual Carrier Sensing Mechanism on EDCA

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