%0 Journal Article
%T MAC Access Delay Analysis of EDCA Mechanism of Wireless LANs<br>无线局域网EDCA机制MAC接入延时分析
%A ZHOU Xin-Yun
%A HUANGFU Wei
%A SUN Li-Min
%A WANG Xian-Lei
%A LI Kai-Hui
%A <br>周新运
%A 皇甫伟
%A 孙利民
%A 王显雷
%A 李凯慧
%J 软件学报
%D 2008
%I 
%X A model is proposed to analyze the MAC (medium access control) access delay of EDCA (enhanced distribution channel access) mechanism of wireless LANs (local area networks),which is based on the moment generating function and signal flow graph.The model gives the probability distribution function (PDF) of MAC access delay and several relative characteristic numbers,including the mean value,variance,standard deviation and deviation coefficient of MAC access delay.The results of the analytical model coincide with simulations,which validates the model proposed.A lot of analyses are presented.Firstly,the model presents the relationship among number of nodes and sending probability,collision probability,freezing probability and mean delay of all ACs (access categories).Secondly,the model discloses the composition of MAC access delay.Thirdly,the model presents the effect of different values of AIFS (arbitration inter frame spacing) on MAC access delay.Lastly,the model presents that the deviation coefficient of MAC access delay is larger than 1,so when the exponential distribution is adopted as the distribution of MAC access delay,the capacity of the queue system will be evaluated wrongly.
%K IEEE 802
%K 11e
%K EDCA (enhanced distribution channel access)
%K MAC (medium access control) access delay
%K performance analysis<br>IEEE
%K 802．11e
%K 增强的分布式信道访问(enhanced
%K distribution
%K channel
%K access，简称EDCA)
%K MAC(medium
%K access
%K control)接入延时
%K 性能分析
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=8240383F08CE46C8B05036380D75B607&jid=7735F413D429542E610B3D6AC0D5EC59&aid=21FE36004618C9B9879CFDD9C463E21E&yid=67289AFF6305E306&vid=2A8D03AD8076A2E3&iid=5D311CA918CA9A03&sid=92E8E2714FC49B30&eid=5E3A696E84245F10&journal_id=1000-9825&journal_name=软件学报&referenced_num=2&reference_num=10