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Potential Pitfalls of the Message in Message Mechanism in Modern 802.11 Networks
BibTeX
@MISC{Wang_potentialpitfalls,
author = {Wei Wang and Wai Kay Leong and Ben Leong},
title = {Potential Pitfalls of the Message in Message Mechanism in Modern 802.11 Networks},
year = {}
}
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Abstract
We study the performance impact of the Message in Mes-sage (MIM) mechanism in modern 802.11 networks. The MIM mechanism refers to the capability of receiver to aban-don an ongoing reception of an 802.11 MAC frame and shift to decode another frame with a higher signal strength. MIM is a common feature in modern 802.11 adapters and it has been shown to improve spatial concurrency. However, our measurement study in a campus WLAN shows that under certain conditions, MIM could cause a throughput degra-dation of more than 30 % when enabled, instead of improv-ing it as expected. With comprehensive experiments using commercial 802.11n adapters, we characterize the impact of MIM for a range of parameters and for different scenarios. We show that a simple adaptive MIM scheme can poten-tially achieve throughput that is close to the optimal. Our method is practical because it can be easily implemented in existing commodity 802.11 adapters.
Keyphrases
message mechanism potential pitfall different scenario campus wlan simple adaptive mim scheme mim mechanism refers signal strength throughput degra-dation measurement study ongoing reception mac frame certain condition performance impact common feature comprehensive experiment spatial concurrency
