標題: | On Synchronized Channel Sensing and Accessing for Cognitive Radio Users in IEEE 802.11 Wireless Networks |
作者: | Lou, TakChon Chao, Hsi-Lu Tsai, Tzu-Jane 資訊工程學系 Department of Computer Science |
關鍵字: | Cognitive radio;channel sensing;channel accessing;synchronized channel hopping;channel vacating |
公開日期: | 2009 |
摘要: | One of the most challenging issues in cognitive radio systems is channel sensing and channel accessing. In this paper, a synchronized channel-sensing and accessing for cognitive radio users in IEEE 802.11 wireless networks is proposed. The mechanism consists of two phases: fast channel sensing and proactive channel vacating. Fast channel sensing is for a pair of cognitive radio users to search an available channel time-efficiently; proactive channel vacating is for the pair of cognitive radio users to be aware of the presence of primary users and vacate the occupied channel as quick as possible. We utilize the concept of channel hopping to reduce the average channel sensing time of cognitive radio users. Besides, through the designed interruption mechanism, cognitive radio users can create opportunities for primary users to claim the spectrum and thus minimize the caused interference to primary users. From the simulation results, our proposed protocol can efficiently balance the tradeoff between throughput performance of a cognitive radio network and waiting time of primary users to claim channels. |
URI: | http://hdl.handle.net/11536/17060 http://dx.doi.org/10.1109/PIMRC.2009.5450103 |
ISBN: | 978-1-4244-5123-4 |
DOI: | 10.1109/PIMRC.2009.5450103 |
期刊: | 2009 IEEE 20TH INTERNATIONAL SYMPOSIUM ON PERSONAL, INDOOR AND MOBILE RADIO COMMUNICATIONS |
起始頁: | 757 |
結束頁: | 761 |
Appears in Collections: | Conferences Paper |
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