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TCP Performance in Mobile Ad Hoc Networks Connected to the Internet
Karlstad University, Faculty of Economic Sciences, Communication and IT.
Karlstad University, Faculty of Economic Sciences, Communication and IT.
2007 (English)In: REVISTA CIENTÍFICA PERIÓDICA - TELECOMUNICAÇÕES, Vol. 10, no 1, 22-29 p.Article in journal (Refereed) Published
Place, publisher, year, edition, pages
2007. Vol. 10, no 1, 22-29 p.
Identifiers
URN: urn:nbn:se:kau:diva-7060OAI: oai:DiVA.org:kau-7060DiVA: diva2:398557
Available from: 2011-02-18 Created: 2011-02-17 Last updated: 2013-06-19Bibliographically approved
In thesis
1. Improving TCP Performance in Wireless Multi-hop Networks: Design of Efficient Forwarding and Packet Processing Techniques
Open this publication in new window or tab >>Improving TCP Performance in Wireless Multi-hop Networks: Design of Efficient Forwarding and Packet Processing Techniques
2011 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Due to the high availability of cheap hardware, wireless multi-hop networks and in particular Wireless Mesh Networks (WMNs) are becoming popular in more and more contexts. For instance, IEEE 802.11 based WMNs have already started to be deployed as means to provide Internet access to rural areas in the developing world. To lower the cost and increase the coverage in such deployments, the wired network is extended with a wireless backbone of fixed mesh routers. With advances in technology and reduction in price comes also the possibility for more powerful wireless nodes, having multiple radios that allow transmitting on different channels in parallel.

To be a successful platform for providing general Internet access, wireless multi-hop networks must provide support for common Internet applications. As most of the applications in the Internet today use the Transmission Control Protocol (TCP), TCP performance is crucial. Unfortunately, the design of TCP’s congestion control that made it successful in today’s Internet makes it perform less than optimal in wireless multi-hop networks. This is due to, among others, TCP’s inability to distinguish wireless losses from congestion losses. The current trend for operating system designers is also to focus TCP development on high-speed fixed networks, rather than on wireless multi-hop networks. To enable wireless multi hop networks as a successful platform there is therefore a need to provide good performance using TCP variants commonly deployed in the Internet.

In this thesis, we develop novel proposals for the network layer in wireless multi-hop networks to support TCP traffic more efficiently. As an initial study, we experimentally evaluate different TCP variants, with and without mobile nodes, in a MANET context.

Our results show that TCP Vegas, which does not provoke packet loss to determine available bandwidth, reduces the stress on the network while still providing the same or slightly increased performance, compared to TCP Newreno. We further propose and evaluate packet aggregation combined with aggregation aware multi-path forwarding to better utilize the available bandwidth.

IP layer packet aggregation, where small packets are combined to larger ones before sent to the link layer, has been shown to improve the performance in wireless multi-hop networks for UDP and small packet transfers. Only few studies have been made on the impact of packet aggregation on TCP traffic, despite the fact that TCP traffic constitutes the majority of the Internet traffic. We propose a novel aggregation algorithm that is specifically addressing TCP relevant issues like packet reordering, fairness and TCP timeouts. In a typical WMN scenario, the aggregation algorithm increases TCP performance by up to 70 % and decreases round trip time (RTT) by up to 40 %.

A detailed evaluation of packet aggregation in a multi radio setting has shown that a naive combination of multi path routing and packet aggregation can cause valuable aggregation opportunities to be lost. Therefore, we propose a novel combined packet aggregation and aggregation aware forwarding strategy that can reduce delay, packet loss and increase TCP performance by around 30 %.

Place, publisher, year, edition, pages
Karlstad: Karlstad University, 2011. 26 p.
Series
Karlstad University Studies, ISSN 1403-8099 ; 2011:5
Keyword
TCP, transport protocols, packet aggregation, multi path routing, wireless mesh networks
National Category
Computer Science
Research subject
Computer Science
Identifiers
urn:nbn:se:kau:diva-6820 (URN)978-91-7063-337-9 (ISBN)
Presentation
2011-03-16, Sjöströmsalen, 1B 309, Karlstads universitet, Karlstad, 10:15 (Swedish)
Supervisors
Available from: 2011-02-22 Created: 2011-01-27 Last updated: 2011-10-27Bibliographically approved
2. 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. 71 p.
Series
Karlstad University Studies, ISSN 1403-8099 ; 2013:1
Keyword
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: 2013-02-18Bibliographically approved

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http://revista.inatel.br/revista/edicoes-em-pdf/v.10.01-dezembro-2007/7.-tcp-performance-in-mobile-ad-hoc-networks-connected-to-the-internet/download.html
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