Solving Ack inefficiencies in 802.11 networks
Murray, D., Koziniec, T. and Dixon, M.W. (2009) Solving Ack inefficiencies in 802.11 networks. In: IEEE International Conference on Internet Multimedia Services Architecture and Applications, IMSAA 2009, 9 - 11 December, Bangalore.
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The founding idea behind this study was that 802.11 acks and TCP acks are substantial contributors to 802.11 overheads, yet, they both provide the same functionality; reliability. Initial experiments suggest that 802.11 acks contribute to over 20% of the overhead in 802.11 networks. Unfortunately, without 802.11 acks, paths with RTTs greater than a millisecond are unable to utilise this additional performance because lost packets, which occur frequently in unacknowledged (NoAck) 802.11, are interpreted as congestion. This study experiments with a range of PEPs (Performance Enhancing Proxies) which retransmit lost packets. A new proxy, known as D-Proxy, designed to solve the shortcomings of previous I-TCP and Snoop proxies, is experimentally developed and tested in Linux. D-Proxy is a distributed, proactive proxy that caches, analyses and resends packets based on TCP sequence numbers. The results suggest that D-Proxy can substantially improve 802.11 throughputs.
|Publication Type:||Conference Paper|
|Murdoch Affiliation:||School of Information Technology|
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