CAJ | 학술논문

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。
빈보퇴양기술시인지무선전중우위중요적일항기술，당주용호출현재수권빈단시인지용호필수신속퇴출해빈단，병천이도신적공한빈단이회복기피중단적전수련로，종이실현보장주용호정상통신적동시학보자신적복무질량，이차제고계통적빈보이용솔。천술료빈보퇴양적개념，분석비교료량대류빈보퇴양책략，즉주동빈보퇴양책략화피동빈보퇴양책략，총결료상관적목표신도선택산법，최후，대수요진일보연구적문제작료설명。
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.