摘要
在认知无线网络中,一旦主用户出现,正在使用该频段的认知用户需退出该频段,寻找另外一个空闲的频段继续未完成的传输,这就是认知无线网络中的频谱切换。评价认知用户频谱切换性能有两个重要的参数:切换时延和切换次数。本文提出了一种基于信道感知排序的频谱切换方法,以同时减少切换时延和切换次数。在进行信道感知排序时,本文使用的方法同时考虑了切换发生时信道空闲概率以及使用该信道时不再发生切换的概率。仿真结果表明,与传统信道排序方法相比,本方法的切换时延可以达到与传统方法一样的性能,然而切换次数却大大地减少了。
In the cognitive radio network, when the primary users show up, the secondary users should vacate the channel and find another free channel for data transmissions. This is the so-called spectrum handoff. There are two most important performance metrics for spectrum handoff： handoff delay and handoff times. A novel spectrum handoff scheme with channel sensing sequencing was proposed in order to decrease both handoff delay and handoff times. When designing the channel sensing sequence, the channel free probability was considered, and the probability that no handoff will happen in a channel was considered as well. The simulation results show that the method not only can get the minimum handoff delay as the traditional method does, but also can decrease the handoff times were significantly compared with the traditional method.
出处
《电信科学》
北大核心
2013年第4期51-56,共6页
Telecommunications Science
基金
国家重点基础研究发展计划("973"计划)基金资助项目(No.2009CB320401)
关键词
频谱切换
切换时延
切换次数
信道感知排序
spectrum handoff, handoff delay, handoff times, channel sensing sequencing
