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In this paper, based on the analyzed emerging challenges encountered by the future radio network, we focus on several candidate techniques targeting at a more spectrum-efficient and cost-effective solution. Among them, spectrum management is one special topic covering fields of technique, regulation and politics. We point out the high tendency of spectrum liberation in terms of spectrum allocation for services and radio technologies even between different network providers. In the networkdoi:10.2529/piers041206104232 fatcat:2p3uukn4k5gnhiwdbwmzhuhxgi