摘要
为了进一步提高无线频谱使用效率,提出了一种认知无线网络中新的动态频谱接入策略,该策略建立在频谱池的基础上,较即时接入方式有较高的接入效率.研究了频谱池的最佳容量和频谱池更新时间,发现最佳容量和系统效率之间的定量关系,提出了频谱池在授权频段和非授权频段不同的动态更新策略.仿真结果表明,2种频段内的频谱池更新时间基本都在1 h之内动态变化.
To improve spectrum utility efficiency, a new strategy of dynamic spectrum access is devel- oped in cognitive wireless network. This strategy, based on spectrum pool, has higher access efficiency than instant manners. The optimal capacity and update time of spectrum pool are all studied. It is found that there is quantitative mathematical relationship between optimal capacity and system efficien- cy. Different update strategies of spectrum pool in licensed and unlicensed frequency bands are also proposed. Simulation manifests that, under the assumed conditions, the update interval will vary within one hour in most cases.
出处
《北京邮电大学学报》
EI
CAS
CSCD
北大核心
2009年第1期1-4,共4页
Journal of Beijing University of Posts and Telecommunications
基金
国家"863计划"项目(2006AA04A106)
国家自然科学基金项目(60632030)
关键词
认知无线电
动态频谱接入
频谱池
容量
更新
cognitive radio
dynamic spectrum access
spectrum pool
capacity
update
