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Offloading in dynamic ultra dense small cell networks

The dynamic ultra-dense cellular network is a kind of networks with high system capacity and fast-changing resource management, and it is a potential solution for the 5G network. In view of small cell architecture, we put forward a wireless heterogeneous network design with the idea of soft defined networking (SDN). The heterogeneous network (HetNet) contains macro base stations, virtual nodes, a center controlled function entity and a large number of mobile devices, etc. A virtual node here is a kind of low power consumed small cell base stations with smaller area coverage. Compared with the small cell base stations in static deployment, virtual base stations are more intensive deployed in each cell and their access can be reconfigured according to the mobility of user equipment. Under a centralized control strategy, the network can dynamically select corresponding base station or virtual node according to the location of mobile devices, in order to balance the area load and improve the offloading performance of the heterogeneous network. Computer simulation results show that the semi-structured scheme is feasible.