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针对认知无线网络中的非实时业务,考虑集中式频谱分配可以实现全局优化,分布式频谱分配具有更好灵活性的特点,引入随机退避和控制中心调度的协作机制,提出一种混合式频谱分配策略.基于系统中授权用户和认知用户分别占用的信道个数,建立一个二维Markov模型,在认知用户理想感知的前提下,给出系统的转移概率矩阵,并进行系统模型的稳态分析.导出混合式频谱分配策略下的信道利用率、认知用户中断率及阻塞率等系统性能指标,并通过系统实验,定量的刻画认知用户数,认知用户到达率及信道数对系统性能的影响.
Considering the non-real-time services in cognitive wireless networks, we consider that global spectrum allocation can achieve global optimization and distributed spectrum allocation has more flexibility. We also introduce a cooperative mechanism of random backoff and control center scheduling to propose a hybrid spectrum Allocation strategy.According to the number of channels respectively occupied by authorized users and cognitive users in the system, a two-dimensional Markov model is established, and the transition probability matrix of the system is given and the stability of the system model State analysis, the system performance indicators such as channel utilization rate, cognitive user interruption rate and blocking rate under mixed spectrum allocation strategy are derived and the number of cognitive users, cognitive user arrival rate and number of channels are quantitatively described through systematic experiments System performance impact.