Proposal of adaptive control CRE in heterogeneous networks

Heterogeneous networks (HetNets) are expected to handle increasing demands for mobile network capacity. This paper presents an adaptive control cell range expansion (CRE) technique that improves the cell edge user throughput in HetNets, in which user equipment (UE) can automatically choose an optimal cell selection offset (CSO). The aspects and algorithm of the proposed CRE are described by comparing them with the conventional method operated by a fixed CSO. Computer simulation results such as average and cell edge user throughput are provided as parameters of the number of UEs. We confirmed that the proposed CRE can improve cell edge user throughput, while maintaining the average user throughput performance. The proposed CRE will play an important role in future mobile communication systems such as LTE-Advanced and beyond.