An Adaptive Channel Handoff Strategy for Opportunistic Spectrum Sharing in Cognitive Global Control Plane Architecture精品.pdfVIP

An Adaptive Channel Handoff Strategy for Opportunistic Spectrum Sharing in Cognitive Global Control Plane Architecture 1,2 1 1,2 1,2 Zhiming Xu , Yu Wang , Jingguo Zhu , and Jian Tang 1 Department of Space Engineering, Academy of Opto-electronics, Chinese Academy of Sciences, Beijing 100190, China 2 School of Information Science and Engineering, Graduate University of Chinese Academy of Sciences, Beijing 100049, China Abstract. In the cognitive wireless networks, the channel handoff strat- egy which controls the communication in a channel to migrate to another channel when primary users hope to access directly affects the quality-of- service of cognitive users and primary users. In this paper, we propose a Cognitive Global Control Plane (CGCP) which embraces the controlling of spectrum sensing, channel handoff and node mobility. With the CGCP architecture, an adaptive channel handoff strategy is given out. We ana- lyze the handoff algorithm with Markov chain theory and some tradeoffs between performance and overhead. The results of performance evalua- tion show that the channel handoff strategy can adaptively and flexibly perform channel handoff. Keywords: Cognitive networks, Channel handoff, Strategy, Adaptive, Control. 1 Introduction For the past decades, with the unprecedented proliferation of wireless mobile devices, it is believed that spectrum is getting acute shortage in the near future. The spectrum regulatory bodies have to start rethinking if their static spectrum strategy is suitable. And they racked their brains to explore h