Loss-tolerant TCP (LT-TCP) : adapting TCP to modern wireless networks

Authors
Hourt, Nathaniel
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Other Contributors
Szymanśki, Bolesław
Kar, Koushik
Cutler, Barbara M.
Ganguly, Bishwaroop
Issue Date
2014-08
Keywords
Computer science
Degree
MS
Terms of Use
Attribution-NonCommercial-NoDerivs 3.0 United States
This electronic version is a licensed copy owned by Rensselaer Polytechnic Institute, Troy, NY. Copyright of original work retained by author.
Full Citation
Abstract
The transport protocol most widely adopted for reliable network communication, TCP, does not fully utilize wireless networks where packet losses and topological changes are prevalent. To address this issue, Loss-Tolerant TCP (LT-TCP) has been implemented to provide robust and efficient communications over potentially lossy networks without assuming the presence of a static network structure.
Experiments have shown LT-TCP to yield throughput speedups of greater than 262 over TCP on high bandwidth networks which experience packet loss bursts of average length 5, causing 10% of total packets to be lost.
Finally, this thesis explores some architectural problems with the current LT-TCP implementation, which limit its portability to modern operating systems, and proposes a new architecture which will facilitate integration of LT-TCP into modern Linux-based operating systems as well as simplify the development and testing of new algorithms to support LT-TCP functionality.
This testing identified some weaknesses in the current LT-TCP implementation, and this thesis describes the subsequent revisions to the protocol to address these weaknesses and provides experimental data demonstrating the effects of these improvements.
Demand for widespread, robust wireless computer networking is increasing rapidly, and unlike wired networks, wireless networks frequently drop packets due to interference or signal attenuation. To compound this issue, mobile, ad-hoc networks have no reliable structure, and routes or adjacent nodes may change without notice.
This thesis examines the current implementation of LT-TCP and compares it with other transport layer solutions on network profiles with tunable loss and delay properties. In particular, tests were conducted with correlated losses, where contiguous groups of packets are dropped, and high latencies. Results show that LT-TCP performance is significantly higher than that of TCP on networks with correlated losses or networks with losses and high latency.
Description
August 2014
School of Science
Department
Dept. of Computer Science
Publisher
Rensselaer Polytechnic Institute, Troy, NY
Relationships
Rensselaer Theses and Dissertations Online Collection
Access
CC BY-NC-ND. Users may download and share copies with attribution in accordance with a Creative Commons Attribution-Noncommercial-No Derivative Works 3.0 License. No commercial use or derivatives are permitted without the explicit approval of the author.