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Published in: Wireless Networks 2/2011

01-02-2011

Optimal channel access for TCP performance improvement in cognitive radio networks

Authors: Changqing Luo, F. Richard Yu, Hong Ji, Victor C. M. Leung

Published in: Wireless Networks | Issue 2/2011

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Abstract

Cognitive radio (CR) is a promising technology to improve spectrum utilization. Most of previous work on CR networks concentrates on maximizing transmission rate in the physical layer. However, the end-to-end transmission control protocol (TCP) performance perceived by secondary users is also a very important factor in CR networks. In this paper, we propose a novel multi-channel access scheme in CR networks, where the channel access is based on the TCP throughput in the transport layer. Specifically, we formulate the channel access process in CR network as a restless bandit system. With this stochastic optimization formulation, the optimal channel access policy is indexable, meaning that the channels with highest indices should be selected to transmit TCP traffic. In addition, we exploit cross-layer design methodology to improve TCP throughput, where modulation and coding at the physical layer and frame size at the data-link layer are considered together with TCP throughput in the transport layer to improve TCP performance. Simulation results show the effectiveness of the proposed scheme.

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Metadata
Title
Optimal channel access for TCP performance improvement in cognitive radio networks
Authors
Changqing Luo
F. Richard Yu
Hong Ji
Victor C. M. Leung
Publication date
01-02-2011
Publisher
Springer US
Published in
Wireless Networks / Issue 2/2011
Print ISSN: 1022-0038
Electronic ISSN: 1572-8196
DOI
https://doi.org/10.1007/s11276-010-0292-9

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