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Dynamic Spectrum Access (DSA) is supposed to be the key technology to improve wireless communication. And at the other hand, Transport Control Protocol (TCP) will be used in DSA networks, considering it's the de-facto standard in wired communication and also has been widely deployed in wireless networks. However, TCP may suffer significant decrease in end-to-end throughput performance caused by spectrum switches in typical DSA networks. In this paper, TCP DSA is proposed to mitigate this issue. This is achieved by monitoring the RTT and throughput periodically, and using them to indicate the spectrum switches. We also calculate the optimal congestion windows of different channels, and use them to adjust TCP congestion window. Thus, we can fully utilize the channel capacity, and obtain higher throughput. TCP DSA is evaluated through simulation and the result shows significant improvement in throughput performance.

Study on TCP Performance Improvement in Dynamic Spectrum Access Networks Based on Spectrum Switch Estimation