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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。
Spectral concession is a particularly important technique in cognitive radio. When the primary user appears in the licensed band, the cognitive user must exit the band quickly and move to the new free band to recover the interrupted transmission link Maintain the normal user communication while ensuring its own quality of service, in order to improve the system’s spectrum utilization. The conception of spectrum concessions is expounded. Two types of spectrum concession strategies are analyzed and compared, namely active spectrum concession strategy and passive spectrum concession strategy, and the relevant target channel selection algorithms are summarized. Finally, the problems that need further research are illustrated.