基于切换的认知QoS分析  

Channel switch based analysis of cognitive QoS

作　　者：朱平[1] 王煦法[1] 

机构地区：[1]中国科学技术大学计算机科学与技术学院,安徽合肥230027

出　　处：《中国科学技术大学学报》2011年第4期362-369,共8页JUSTC

基　　金：国家自然科学基金(60602019/F0101)资助

摘　　要：研究了认知无线电系统中认知用户的服务切换.提出一种"随机单次切换"策略,并通过构建基于信道叠加的半马尔科夫多信道切换模型,分析认知用户在频谱租用过程中的服务等待时间及切换开销.理论和实验表明,"随机单次切换"策略下,认知用户具有更小的服务等待时间和切换开销.The cognitive user＇s channel switch process was studied, and a ＂random once switch＂ policy was proposed. Moreover, a channel superposition theory based semi-Markov multi-channel switch model was constructed, to analyze the cognitive user＇s service waiting time and switch overhead during its spectrum leasing process. Theoretical and experimental results show that with the ＂random once switch＂ policy, the cognitive user has a shorter service waiting time and smaller switch overhead.

关 键 词：认知无线电 认知QoS 信道切换 信道叠加 

分 类 号：TN929.5[电子电信—通信与信息系统]