TCP performance in cognitive multi-radio mesh networks
Wooseong Kim, Andreas Kassler, Mário Gerla · 2011
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.