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Utility-based User Association In Heterogeneous Wireless Networks
Yanjia Qi,Hongyu Wang 한국정보통신학회 2015 2016 INTERNATIONAL CONFERENCE Vol.7 No.1
With many types of small cells and heterogeneous wireless networks emerging, how to allocate correct base station to a mobile user becomes a critical and challenging problem. Previous research proposed several methods such as RSRP-based, RE, RE with ABS and Bias-based cell selection. However, these methods do not consider mobile users" satisfaction degree. This paper considers a general utility maximization problem for joint optimization of mobile user associations and bandwidth allocations in cellular networks. The problem can incorporate a large class of network topologies and constraints. We first get optimal bandwidth allocation in multi-path connection scenario which can be applied in carrier aggregation scenarios where users can connect multiple base stations. Then we use truncation method to help user find specific optimal serving base station. Because the problem is non-convex, we show that the optimization admits a separable dual decomposition. This property enables fast computation of global optimal solution on the utility in an efficient, distributed implementation manner via augmented Lagrangian techniques. Simulations show in heterogeneous networks with macrocells and picocells, the proposed method achieves much better cell-edge users and median users performances than conventional cell selection method.
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