Rate Adaptation Based on Collision Probability for IEEE 802.11 WLANs

Taejoon KIM  Jong-Tae LIM  

IEICE TRANSACTIONS on Communications   Vol.E91-B    No.4    pp.1227-1230
Publication Date: 2008/04/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e91-b.4.1227
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Terrestrial Radio Communications
IEEE 802.11,  rate adaptation,  ARF,  

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Nowadays IEEE 802.11 wireless local area networks (WLANs) support multiple transmission rates. To achieve the best performance, transmitting stations adopt the various forms of automatic rate fallback (ARF). However, ARF suffers from severe performance degradation as the number of transmitting stations increases. In this paper, we propose a new rate adaptation scheme which adjusts the ARF's up/down threshold according to the channel contention level. Simulation result shows that the proposed scheme achieves fairly good performance compared with the existing schemes.