As one of the key enabling technologies of the fifth generation wireless network (5G), software defined network\n(SDN) offers a logically centralized control model, flexible programmability, and a flow-based paradigm that is ideally\nsuited for highly scalable wireless networks, from access to core part. Following this paradigm, a novel software-defined\nradio access network (SDRAN) architecture and the function modules have been proposed in this paper. In particular,\nthe motivation, challenge, and deployment roadmap of SDRAN framework are discussed. The relationships between\nalternative solutions (Cloud RAN, network function virtualization) and complementary technologies (cognitive radio,\nself-organizing network, big data analysis) are analyzed in detail. Taking interference management of heterogeneous\nmobile network as the example use case, scheme design and preliminary system evaluations are given to show the\nbenefit of SDRAN architecture.
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