摘要
频谱退让技术是认知无线电中尤为重要的一项技术,当主用户出现在授权频段时认知用户必须迅速退出该频段,并迁移到新的空闲频段以恢复其被中断的传输链路,从而实现保障主用户正常通信的同时确保自身的服务质量,以此提高系统的频谱利用率。阐述了频谱退让的概念,分析比较了两大类频谱退让策略,即主动频谱退让策略和被动频谱退让策略,总结了相关的目标信道选择算法,最后,对需要进一步研究的问题作了说明。
Spectrum handoff is a key technology in cognitive radio,and when the primary user appears at the licensed spectrum,the cognitive user must quickly vacate the spectrum,move to a new idle spectrum and resume the unfinished transmission,thus to ensure the service quality while guaranteeing the normal communication of the primary user.This would improve the overall spectrum utilization of the system.This paper gives the concept of spectrum handoff,compares two major types of spectrum handoff strategies,that is proactive spectrum handoff strategy and reactive spectrum handoff strategy.Finally this paper summarizes the related target channel selection algorithms,and points out the future work on this topic.
出处
《通信技术》
2013年第8期12-14,共3页
Communications Technology
基金
国家科技重大专项资助项目(No.2012ZX03003005-003)
关键词
认知无线电
频谱退让
频谱切换
目标信道选择
退让时延
cognitive radio
spectrum handoff
spectrum switch
target channel selection
handoff delay
