摘要
为了解决认知无线网络中认知用户频繁切换的问题,最大程度上降低认知用户的切换次数,在已建频谱池的基础上,提出了频谱空穴空闲时间由长到短的排队时间模型,并对该模型下的频谱切换概率问题进行对比研究。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,研究了授权用户到达率与认知用户到达率对频谱切换概率的影响,给出了频谱切换的概率仿真,仿真证明该模型比随机信道选择的效果更优越。
In order to solve cognitive users frequent switching in the cognitive wireless network, and minimize the num- ber of cognitive users handoff, the spectrum holes model that free time from long to short waiting time is built based on spec- trum pooling, and compared to non-queuing model. Then it infers probability formula within a cognitive service request time of arising spectrum handoff, and researches effect that primary user arrival rate and the cognitive user arrival rate take on the spectrum handoff probability, given the probability simulation of spectrum handoff. Simulation results show that this model is better than the random channel selection.
出处
《计算机与数字工程》
2014年第4期566-569,684,共5页
Computer & Digital Engineering
关键词
认知无线电
频谱池
频谱切换
空闲时间
切换概率
cognitive radio, spectrum pooling, spectrum handoff, idle time, spectrum handoff probability
