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TCP-L: Allowing Bit Errors in Wireless TCP
Karlstad University, Division for Information Technology. (Distributed Systems and Communication Research Group)ORCID iD: 0000-0003-0368-9221
Karlstad University, Division for Information Technology. (Distributed Systems and Communication Research Group)
2003 (English)In: Proceedings of the 12th IST Summit on Mobile and Wireless Communications: Enabling a Pervasive Wireless World / [ed] Atílio Gameiro, Institute for Operations Research and the Management Sciences (INFORMS), 2003, 149-154 p.Conference paper, Published paper (Refereed)
Abstract [en]

This paper presents a technique to improve the performance of TCP and the utilization of wireless networks.Wireless links exhibit high rates of bit errors, compared to communication over wireline or fiber. Since TCP cannotseparate packet losses due to bit errors versus congestion,all losses are treated as signs of congestion and congestionavoidance is initiated. This paper explores the possibility of accepting TCP packets with an erroneous checksum, toimprove network performance for those applications that can tolerate bit errors. Since errors may be in the TCP header aswell as the payload, the possibility of recovering the headeris discussed. An algorithm for this recovery is also presented.Experiments with an implementation have been performed,which show that large improvements in throughput can beachieved, depending on link and error characteristics.

Place, publisher, year, edition, pages
Institute for Operations Research and the Management Sciences (INFORMS), 2003. 149-154 p.
Keyword [en]
TCP, wireless, emulation, bit error recovery, partial reliability
National Category
Computer Systems
Research subject
Computer Science
Identifiers
URN: urn:nbn:se:kau:diva-2338ISBN: 972-98368-1-7 (print)OAI: oai:DiVA.org:kau-2338DiVA: diva2:24677
Conference
IST - Mobile & Wireless Communications Summit, Aveiro
Projects
Wireless IP
Available from: 2009-06-08 Created: 2009-06-08 Last updated: 2014-09-10Bibliographically approved
In thesis
1. TCP in Wireless Networks: Challenges, Optimizations and Evaluations
Open this publication in new window or tab >>TCP in Wireless Networks: Challenges, Optimizations and Evaluations
2005 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis presents research on transport layer behavior in wireless networks. As the Internet is expanding its reach to include mobile devices, it has become apparent that some of the original design assumptions for the dominant transport protocol, TCP, are approaching their limits. A key feature of TCP is the congestion control algorithm, constructed with the assumption that packet loss is normally very low, and that packet loss therefore is a sign of network congestion. This holds true for wired networks, but for mobile wireless networks non-congestion related packet loss may appear. The varying signal power inherent with mobility and handover between base-stations are two example causes of such packet loss. This thesis provides an overview of the challenges for TCP in wireless networks together with a compilation of a number of suggested TCP optimizations for these environments. A TCP modification called TCP-L is proposed. It allows an application to increase its performance, in environments where residual bit errors normally give a degraded throughput, by making a reliability tradeoff. The performance of TCP-L is experimentally evaluated with an implementation in the Linux kernel. The transport layer performance in a 4G scenario is also experimentally investigated, focusing on the impact of the link layer design and its parameterization. Further, for emulation-based protocol evaluations, controlled packet loss and bit error generation is shown to be an important aspect.

Place, publisher, year, edition, pages
Karlstad: Karlstads universitet, 2005
Series
Karlstad University Studies, ISSN 1403-8099 ; 2005:13
Keyword
Wireless networks, TCP/IP, TCP-L, Network emulation
National Category
Computer Systems
Research subject
Computer Science
Identifiers
urn:nbn:se:kau:diva-2335 (URN)91-85335-53-3 (ISBN)
Presentation
2005-05-18, Agardsalen, 11D 257, Karlstads universitetKarlstad, 13:15 (English)
Opponent
Supervisors
Available from: 2009-06-05 Created: 2009-04-08 Last updated: 2016-10-25Bibliographically approved

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