A wireless communication technology field IEEE? Select the number of sub channel reserved in 802.22 networks, the method considered the spectrum sensing mechanism in the frame joints are analyzed in detail to complete the user service leave and new users, and get the accurate Markov chain state transtion-probablity matrix. Through the analysis of discrete time Markov chain, the invention has been forced to interrupt throughput, quantitative expression rate and handover queue average queuing delay of the three key performance indicators, and according to the specific requirements of application scenarios on the performance index to weigh the various performance indicators to select the appropriate reservation number of sub channel with low technical complexity; high efficiency, wide application, etc., suitable for cognitive radio network performance prediction or resource management.
【技术实现步骤摘要】
【技术保护点】
1.一种IEEE 802.22网络中选取预留子信道个数的方法,其特征在于,包括以下步骤:第一步,获取网络环境的系统参数,即基站个数、用户端设备个数、子信道个数、预留子信道数、切换队列容量、TDD帧的持续时间、带外感知的虚警概率、带内感知的虚警概率、使用子信道的授权用户和用户端设备发送数据的速率,以及每帧结束时用户端设备结束使用子信道概率、授权用户占用子信道的概率和结束使用子信道的概率;第二步,根据第一步得到的系统参数构建系统状态空间,并分别求得离开事件和到达事件的转移概率矩阵P1和P2,并综合得到系统转移概率矩阵P以及系统稳态;第三步,根据系统稳态得到网络吞吐量、强迫中断率和平均排队时延相对于预留子信道个数的函数并获得预留子信道个数。
【技术特征摘要】
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