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Modeling the 802.11e Enhanced Distributed Channel Access Function

Summary: Modeling the 802.11e Enhanced Distributed
Channel Access Function
Inanc Inan, Feyza Keceli, and Ender Ayanoglu
Center for Pervasive Communications and Computing
Department of Electrical Engineering and Computer Science
The Henry Samueli School of Engineering, University of California, Irvine
Email: {iinan, fkeceli, ayanoglu}@uci.edu
Abstract--The Enhanced Distributed Channel Access (EDCA)
function of IEEE 802.11e standard defines multiple Access
Categories (AC) with AC-specific Contention Window (CW)
sizes, Arbitration Interframe Space (AIFS) values, and Transmit
Opportunity (TXOP) limits to support MAC-level Quality-of-
Service (QoS). In this paper, we propose an analytical model for
the EDCA function which incorporates an accurate CW, AIFS,
and TXOP differentiation at any traffic load. The proposed model
is also shown to capture the effect of MAC layer buffer size on the
performance. Analytical and simulation results are compared to
demonstrate the accuracy of the proposed approach for varying
traffic loads, EDCA parameters, and MAC layer buffer space.


Source: Ayanoglu, Ender - Department of Electrical and Computer Engineering, University of California, Irvine


Collections: Engineering