认知无线电网络中频谱切换概率研究  

Research on the Spectrum Handoff Probability in Cognitive Wireless Network

作　　者：刘红杰[1] 李书芳[1] 洪卫军[1] 宋起柱[2] 

机构地区：[1]北京邮电大学电信工程学院,北京100876 [2]国家无线电监测中心,北京100037

出　　处：《世界科技研究与发展》2009年第5期839-841,813,共4页World Sci-Tech R&D

基　　金：国家自然科学基金项目(60632030);国家"863"计划项目(2006AA04A106)

摘　　要：为了解决认知无线网络中由于频谱的移动性给无线资源管理带来的新挑战,提出了一种描述频谱移动和认知用户行为的时间关系模型,并对该时间模型下的频谱切换概率问题进行了研究。推导了一次认知业务请求服务时间内,发生频谱切换的概率公式,研究了频谱空洞消失的速率与认知业务离开的速率对频谱切换概率的影响,给出了频谱切换不大于4次时的理论和仿真概率,仿真结果验证了理论结果的正确性。研究结果表明,频谱空洞消失的越快,认知业务持续的时间越长,发生频谱切换的概率就越大。A time relationship model describing the spectrum mobility and cognitive user＇s behavior was developed to resolve the new challenges on wireless resources management due to the mobility of spectrum in cognitive wireless network. Spectrum handoff probability was studied under the time relationship model. A probability equation of spectrum handoff during one cognitive service holding time was deduced. The impact of spectrum holes and cognitive service departure rate on spectrum handoff probability was researched. Probability values were obtained both in theoretical and simulation when spectrum handoff times less than 4. Theoretical results were conformed by simulations. Conclusion shows that the faster spectrum holes depart or the longer one cognitive service last, the greater the spectrum handoff probability appear.

关 键 词：认知无线电 频谱移动 频谱切换 概率 

分 类 号：TN925[电子电信—通信与信息系统]