tailieunhanh - Báo cáo hóa học: " Research Article Game Theoretical Approaches for Transport-Aware Channel Selection in Cognitive Radio Networks"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Game Theoretical Approaches for Transport-Aware Channel Selection in Cognitive Radio Networks | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2010 Article ID 598534 14 pages doi 2010 598534 Research Article Game Theoretical Approaches for Transport-Aware Channel Selection in Cognitive Radio Networks Shih-Ho Chen Tein-Yaw Chung and Yung-Mu Chen Department of Computer Science and Engineering Yuan Ze University 135 Yuan-Tung Road Chung-Li 32003 Taiwan Correspondence should be addressed to Tein-Yaw Chung csdchung@ Received 29 April 2010 Revised 12 October 2010 Accepted 24 October 2010 Academic Editor Sayandev Mukherjee Copyright 2010 Shih-Ho Chen et al. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. Effectively sharing channels among secondary users SUs is one of the greatest challenges in cognitive radio network CRN . In the past many studies have proposed channel selection schemes at the physical or the MAC layer that allow SUs swiftly respond to the spectrum states. However they may not lead to enhance performance due to slow response of the transport layer flow control mechanism. This paper presents a cross-layer design framework called Transport Aware Channel Selection TACS scheme to optimize the transport throughput based on states such as RTT and congestion window size of TCP flow control mechanism. We formulate the TACS problem as two different game theoretic approaches Selfish Spectrum Sharing Game SSSG and Cooperative Spectrum Sharing Game CSSG and present novel distributed heuristic algorithms to optimize TCP throughput. Computer simulations show that SSSG and CSSG could double the SUs throughput of current MAC-based scheme when primary users PUs use their channel infrequently and with up to 12 to 100 throughput increase when PUs are more active. The simulation results also illustrated that CSSG performs up to 20 .