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Evaluation of Transport Layer Loss Notification in Wireless Environments
Karlstad University, Division for Information Technology.ORCID iD: 0000-0003-3461-7079
Karlstad University, Division for Information Technology.ORCID iD: 0000-0001-7311-9334
2005 (English)In: Networking - ICN 2005: 4th International Conference on Networking, Reunion Island, France, April 17-21, 2005, Proceedings, Part I / [ed] Pascal Lorenz & Petre Dini, Springer Berlin/Heidelberg, 2005, p. 247-257Conference paper, Published paper (Other academic)
Abstract [en]

Residual bit-errors in wireless environments are well known to cause difficulties for congestion controlled protocols like TCP. In this study we focus on a receiver-based loss differentiation approach to mitigating the problems, and more specifically on two different loss notification schemes. The fully receiver-based 3-dupack scheme uses additional dupacks to implicitly influence the retransmission behavior of the sender. The second TCP option scheme uses a TCP option to explicitly convey a corruption notification. Although these schemes look relatively simple at first glance, when examining the details several issues exist which are highlighted and discussed. A performance evaluation based on a FreeBSD kernel implementation show that the TCP option scheme works well in all tested cases and provides a considerable throughput improvement. The 3-dupack scheme also provide performance gains in most cases, but the improvements varies more between different test cases, with some cases showing no improvement over regular TCP.

Place, publisher, year, edition, pages
Springer Berlin/Heidelberg, 2005. p. 247-257
Series
Lecture Notes in Computer Science, ISSN 0302-9743 ; 3420
National Category
Computer Systems
Research subject
Computer Science
Identifiers
URN: urn:nbn:se:kau:diva-2370DOI: 10.1007/978-3-540-31956-6_30ISBN: 978-3-540-25339-6 (print)ISBN: 978-3-540-31956-6 (print)OAI: oai:DiVA.org:kau-2370DiVA, id: diva2:24709
Conference
4th International Conference on Networking, Reunion Island, France, April 17-21, 2005
Available from: 2009-06-18 Created: 2009-06-18 Last updated: 2018-08-14Bibliographically approved
In thesis
1. Improving Performance in Heterogeneous Networks: A Transport Layer Centered Approach
Open this publication in new window or tab >>Improving Performance in Heterogeneous Networks: A Transport Layer Centered Approach
2005 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The evolution of computer communications and the Internet has led to the emergence of a large number of communication technologies with widely different capabilities and characteristics. While this multitude of technologies provides a wide array of possibilities it also creates a complex and heterogeneous environment for higher-layer communication protocols. Specific link technologies, as well as overall network heterogeneity, can hamper user-perceived performance or impede end-to-end throughput.

In this thesis we examine two transport layer centered approaches to improve performance.

The first approach addresses the decrease in user satisfaction that occurs when web waiting times become too long. Increased transport layer flexibility with regards to reliability, together with error-resilient image coding, is used to enable a new trade-off. The user is given the possibility to reduce waiting times, at the expense of image fidelity.

An experimental examination of this new functionality is provided, with a focus on image-coding aspects. The results show that reduced waiting times can be achieved, and user studies indicate the usefulness of this new trade-off.

The second approach concerns the throughput degradations that can occur as a consequence of link and transport layer interactions. An experimental evaluation of the GSM environment shows that when negative interactions do occur, they are coupled to large variability in link layer round-trip times rather than simply to poor radio conditions. Another type of interaction can occur for link layers which expose higher layers to residual bit errors.

Residual bit errors create an ambiguity problem for congestion controlled transport layer protocols which cannot correctly determine the cause for a loss. This ambiguity leads to an unnecessary throughput degradation. To mitigate this degradation, loss differentiation and notification mechanisms are proposed and experimentally evaluated from both performance and fairness perspectives. The results show that considerable performance improvements can be realized. However, there are also fairness implications that need to be taken into account since the same mechanisms that improve performance may also lead to unfairness towards flows that do not employ loss differentiation.

Series
Karlstad University Studies, ISSN 1403-8099 ; 2005:27
Keywords
transport protocols, partial reliability, image transfer, transcoding, loss differentiation, fairness, wireless networks, network emulation
National Category
Computer Sciences
Research subject
Computer Science
Identifiers
urn:nbn:se:kau:diva-2364 (URN)91-85335-68-1 (ISBN)
Public defence
2005-06-17, Agardh-salen, 11D 257, Karlstads universitetKarlstad, 13:15 (English)
Opponent
Supervisors
Available from: 2009-06-09 Created: 2009-06-09 Last updated: 2018-01-13Bibliographically approved

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Garcia, JohanBrunstrom, Anna

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