Network Coding for TCP Throughput Enhancement over a Multi-Hop wireless Network

David, Samuel P and Kumar, Anurag (2008) Network Coding for TCP Throughput Enhancement over a Multi-Hop wireless Network. In: Proceedings COMSWARE'08, Bangalore, 6-10 Jan. 2008, Bangalore .

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Abstract

The poor performance of TCP over multi-hop wireless networks is well known. In this paper we explore to what extent network coding can help to improve the throughput performance of TCP controlled bulk transfers over a chain topology multi-hop wireless network. The nodes use a CSMA/ CA mechanism, such as IEEE 802.11’s DCF, to perform distributed packet scheduling. The reverse flowing TCP ACKs are sought to be X-ORed with forward flowing TCP data packets. We find that, without any modification to theMAC protocol, the gain from network coding is negligible. The inherent coordination problem of carrier sensing based random access in multi-hop wireless networks dominates the performance. We provide a theoretical analysis that yields a throughput bound with network coding. We then propose a distributed modification of the IEEE 802.11 DCF, based on tuning the back-off mechanism using a feedback approach. Simulation studies show that the proposed mechanism when combined with network coding, improves the performance of a TCP session by more than 100%.

Item Type:	Conference Paper
Publisher:	IEEE
Additional Information:	Copyright 2008 IEEE. Personal use of this material is permitted.However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Keywords:	multi-hop wireless networks;network coding;TCP performance over wireless networks
Department/Centre:	Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited:	17 Oct 2011 08:02
Last Modified:	17 Oct 2011 08:02
URI:	http://eprints.iisc.ac.in/id/eprint/40627

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