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The Interaction Between TCP Reordering Mechanisms and Multi-path Forwarding in Wireless Mesh Networks
Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science. (Datavetenskap)ORCID iD: 0000-0002-4366-6625
Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science. (Datavetenskap)ORCID iD: 0000-0002-8731-2482
Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science. (Datavetenskap)ORCID iD: 0000-0001-7311-9334
Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science. (Datavetenskap)ORCID iD: 0000-0002-9446-8143
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2012 (English)In: 2012 IEEE 8th International Conference on Wireless and Mobile Computing, Networking and Communications (WiMob), IEEE Press, 2012, p. 276-283Conference paper, Published paper (Refereed)
Abstract [en]

Routing packets over multiple disjoint paths towards a destination can increase network utilization by load-balancing the traffic over the network. In wireless mesh networks, multi-radio multi-channel nodes are often used to create a larger set of interference-free paths thus increasing the chance of load-balancing. The drawback of load-balancing is that different paths might have different delay properties, causing packets to be reordered. This can reduce TCP performance significantly, as reordering is interpreted as a sign of congestion. Packet reordering can be avoided by letting the network layer forward traffic strictly on flow-level. This would avoid the negative drawbacks of packet reordering, but will also limit the ability to achieve optimal network throughput. On the other hand, there are several proposals that try to mitigate the effects of reordering at the transport layer. In this paper, we perform an in-depth evaluation of such TCP reordering mitigations in multi-radio multi-channel wireless mesh networks when using multi-path forwarding. We evaluate two TCP reordering mitigation techniques implemented in the Linux kernel. The transport layer mitigations are compared using different multi-path forwarding strategies. Our findings show that, in general, flow-level forwarding gives the best TCP performance and that transport layer reordering mitigations only marginally can improve performance

Place, publisher, year, edition, pages
IEEE Press, 2012. p. 276-283
Keywords [en]
TCP, reordering, Wireless Mesh Networks, Multi-channel, Multi-radio, Multi-path
National Category
Communication Systems
Research subject
Computer Science
Identifiers
URN: urn:nbn:se:kau:diva-14503DOI: 10.1109/WiMOB.2012.6379088ISBN: 978-1-4673-1429-9 (print)OAI: oai:DiVA.org:kau-14503DiVA, id: diva2:544525
Conference
The 8th IEEE International Conference on Wireless and Mobile Computing, Networking and Communications (WiMob 2012), October 2012, Barcelona, Spain
Note

Kommande

Available from: 2012-08-15 Created: 2012-08-15 Last updated: 2018-07-23Bibliographically approved
In thesis
1. Transport-Layer Performance in Wireless Multi-Hop Networks
Open this publication in new window or tab >>Transport-Layer Performance in Wireless Multi-Hop Networks
2013 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Wireless communication has seen a tremendous growth in the last decades. Continuing on this trend, wireless multi-hop networks  are nowadays used or planned for use in a multitude of contexts, spanning from Internet access at home to emergency situations.

The Transmission Control Protocol (TCP) provides reliable and ordered delivery of a data and is used by major Internet applications such as web browsers, email clients and file transfer programs. TCP traffic is also the dominating traffic type on the Internet. However, TCP performs less than optimal in wireless multi-hop networks due to packet reordering, low link capacity, packet loss and variable delay.

In this thesis, we develop novel proposals for enhancing the network and transport layer to improve TCP performance in wireless multi-hop networks. As initial studies, we experimentally evaluate the performance of different TCP variants, with and without mobile nodes. We further evaluate the impact of multi-path routing on TCP performance and propose packet aggregation combined with aggregation aware multi-path forwarding as a means to better utilize the available bandwidth. The last contribution is a novel extension to multi-path TCP to  enable single-homed hosts to fully utilize the network capacity.

Place, publisher, year, edition, pages
Karlstad: Karlstads universitet, 2013. p. 71
Series
Karlstad University Studies, ISSN 1403-8099 ; 2013:1
Keywords
TCP, MPTCP, transport protocols, packet aggregation, multi-path routing, reordering, wireless multi-hop networks, tactical MANET, mobile ad hoc networks, wireless mesh networks
National Category
Communication Systems
Research subject
Computer Science
Identifiers
urn:nbn:se:kau:diva-15603 (URN)978-91-7063-473-4 (ISBN)
Public defence
2013-03-04, 1B 364, Fröding, Karlstads Universitet, Karlstad, 10:15 (English)
Opponent
Supervisors
Note

Opponent changed. Prof. C. Lindeman from the University of Leipzig was substituted by Prof. Zhang.

Available from: 2013-02-08 Created: 2012-11-14 Last updated: 2018-07-23Bibliographically approved

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Karlsson, JonasHurtig, PerBrunstrom, AnnaKassler, Andreas

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