An enhancement to the IEEE 802.11e EDCA providing QoS guarantees |
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Authors: | Ali Hamidian Ulf Körner |
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Affiliation: | (1) Department of Communication Systems, Lund University, Box 118, 221 00 Lund, Sweden |
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Abstract: | One of the challenges that must be overcome to realize the practical benefits of ad hoc networks is quality of service (QoS).
However, the IEEE 802.11 standard, which undeniably is the most widespread wireless technology of choice for WLANs and ad
hoc networks, does not address this issue. In order to support applications with QoS requirements, the upcoming IEEE 802.11e
standard enhances the original IEEE 802.11 MAC protocol by introducing a new coordination function which has both contention-based
and contention-free medium access methods. In this paper, we consider the contention-based medium access method, the EDCA,
and propose an extension to it such that it can be used to provide QoS guarantees in WLANs operating in ad hoc mode. Our solution
is fully distributed, uses admission control to regulate the usage of resources and gives stations with high-priority traffic
streams an opportunity to reserve time for collision-free access to the medium. |
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Keywords: | QoS – IEEE 802 11e – distributed MAC Admission control and scheduling |
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