Research on dynamic spectrum access for MAC protocol
Lianzhi Wang · Digital Communication · 2009
Opportunistic spectrum access(OSA)allows unlicensed secondary networks to share licensed spectrum in space and time,but only when licensed users 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.