On the transmission opportunity and TCP throughput in cognitive radio networks |
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| Authors: | Jian Wang Aiping Huang Wei Wang Zhaoyang Zhang Vincent K.N. Lau |
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| Affiliation: | 1. Institute of Information and Communication Engineering, Zhejiang University, Hangzhou, China;2. Zhejiang Provincial Key Laboratory of Information Network Technology, Hangzhou, China;3. Department of Electronic and Computer Engineering, Hong Kong University of Science and Technology, Hong Kong, China |
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| Abstract: | The characteristics of cognitive radio networks have huge impacts on the end‐to‐end performance of the transmission control protocol (TCP) for secondary users. Thus, the existing TCP throughput expression, widely used in wired and wireless networks, is no longer suitable for cognitive radio networks. In this paper, we derive the transmission opportunity of secondary users, taking into account the dynamics of spectrum availability, the overhead and errors of spectrum sensing, as well as the interaction between TCP and lower layers. The amount of transmission opportunity is expressed in terms of effective data transmission time. On the basis of the analysis of the transmission opportunity, an expression of an effective TCP throughput is then derived. To evaluate this effective TCP throughput expression, two cross‐layer optimization problems are formulated as application examples to maximize the transport layer effective throughput and energy utility, respectively. Simulation results show that our analysis on transmission opportunity is accurate, and the derived effective TCP throughput expression is more precise than existing ones. Copyright © 2012 John Wiley & Sons, Ltd. |
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| Keywords: | cognitive radio networks effective data transmission time effective TCP throughput imperfect spectrum sensing inter‐layer interaction |
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