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End to end available bandwidth is often constrained by IEEE 802.11 hops in the access network. Available bandwidth measurement is particularly challenging in the wireless environment because of adaptive data rates, a time varying channel, and CSMA/CA based contention instead of simple FIFO queueing. The authors present a novel estimation scheme for IEEE 802.11 networks in infrastructure mode, based on passive monitoring, without any need for access point cooperation or protocol modifications. They employ an empirical map of relationships local to the client station, and direct measurements of channel utilisation, combined with the known packet size dependent overheads.
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