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This paper considers end-to-end per-station1 and per-flow fair bandwidth allocations for TCP traffic in 802.11 based multi-radio multi-hop networks. First it shows that TCP ACK packets have to be prioritised using IEEE 802.11e since otherwise congestion losses of ACK packets cause unpredictable performance. Then it proves that prioritising ACK packets alone and ignoring TCP data packets results in per-station max-min fairness. In terms of flow level fairness however, this paper highlights that gross unfairness can exist between competing traffic flows due to this per-station max-min fairness. The use of 802.11e's Transmission Opportunity (TXOP) mechanism to enforce/restore fairness is proposed.

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Format:PDFSize:314 KB
Date:Jul 2007
Pages:14

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