Analytical Modeling of IEEE 802.11e Enhanced Distributed Channel Access under a Non-Saturation Condition | Science Publications

Journal of Computer Science

G. Prakash¹  P. Thangaraj¹ 

关键词: Enhanced Distributed Channel Access (EDCA);    markov model;    Contention Window (CW);    non-saturation;    Quality-of-Servi (QoS);    Bit Error Rate (BER);   

DOI  :  10.3844/jcssp.2011.554.560

学科分类：计算机科学（综合）

来源: Science Publications

【 摘 要 】

Problem statement: The IEEE 802.11e EDCA protocol with different access Categories(ACs) supporting for Quality-of-Service (QoS). Due to internal or external packet collision, theContention Window (CW) of the station increases the channel idle time under high Bit Error Rate(BER). Approach: In this study, we propose an analytical model for performance evaluation of IEEE802.11e EDCA scheme under non-saturation condition and error prone channel. The new markovchain model have decrease the channel idle time in IEEE 802.11 EDCA and considerably increases thethroughput for minimum number of station. Results: We develop an expression for the nonsaturationthroughput as a function of the number of stations, packet sizes and BER. Conclusion: We validate theaccuracy of our analysis with simulation expression. Using this model, the contention factors can beset appropriately to attain particular Quality-of-Service (QoS) requirements.

【 授权许可】

Unknown