动态频谱接入MAC协议研究

机会频谱接入（OSA,opportunistic spectrum access）允许未授权用户在空间域和时域上共享授权频谱,但仅当授权用户没有占用这些频谱时认知用户才能接入。另外频谱环境的动态性使MAC协议设计面临着几个重要的问题,即认知用户需要确定何时以什么方式接入哪一个信道发送/接收数据而不影响主用户的通信。从OSA-MAC设计面临的技术挑战出发,对近年来国内外在该方向的研究成果做了总结和分析,并阐述了OSA-MAC设计亟待解决的问题和今后的研究方向。

Research on dynamic spectrum access for MAC protocol

Opportunistic spectrum access （OSA）allows unlicensed secondary networks to share licensed spectrum in space and time, but only when licensed lasers are not using the spectrum. In addition, the dynamic of spectrum environment implies a few nontrivial problems to MAC design, including how the secondary user decide and to which channel it should tune in order to transmit/receive packets without affecting the communications of the primary users. This paper comprehensively summarizes and analyzes the researches of recent years on the challenges of OSA-MAC design. Based on the analysis, it discusses the problem that must be resolved to design an efficient OSA-MAC in cognitive wireless network, and points out the research direction in the future.