TCP performance in cognitive multi-radio mesh networks

Authors:
Wooseong Kim;Andreas Kassler;Mario Gerla
Affiliations:
University of California, Los Angeles;Karstads Universitet, Karlstad, Sweden;University of California, Los Angeles
Venue:
Proceedings of the 4th International Conference on Cognitive Radio and Advanced Spectrum Management
Year:
2011

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Abstract

Wireless Mesh Networks (WMNs) that operate in license-free spectrum portions (e.g. ISM bands) in dense urban areas face heavy interference from coexisting devices such as residential access points. We address this challenge by designing Urban-X which is a new architecture for MultiRadio Cognitive Mesh Networks. It combines principles from Dynamic Spectrum Access Networks to develop novel spectrum aware channel assignment and routing algorithms. However, spectrum sensing and channel switching overhead may lead to a large variation in delay and available bandwidth. In this study, we evaluate the impact of Urban X on TCP. More specifically we analyze the impact of different external interference patterns and Urban-X configurations on TCP performance. Finally, we compare Urban-X with traditional multi-radio networks and demonstrate the superiority of our spectrum aware architecture.