Analytical Modeling of IEEE 802.11e Enhanced Distributed Channel Access under a Non-Saturation Condition
Prakash · Journal of Computer Science · 2011
Problem statement: The IEEE 802.11eEDCA protocol with different access Categories (ACs) supporting for Quality-of-Service (QoS).Due to internal or external packet collision, the Contention 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 IEEE 802.11eEDCA scheme under non-saturation condition and error prone channel.The new markov chain model have decrease the channel idle time in IEEE 802.11EDCA and considerably increases the throughput for minimum number of station.Results: We develop an expression for the nonsaturation throughput as a function of the number of stations, packet sizes and BER.Conclusion: We validate the accuracy of our analysis with simulation expression.Using this model, the contention factors can be set appropriately to attain particular Quality-of-Service (QoS) requirements.