Research On Small Cell Selection In 5G User-centric Networks

To solve the problem of cumulate interference and frequent handover in 5G Ultra-dense Network(UDN),the concept of User-centric Network(UCN)is proposed.UCN shifts the cell-centric architecture in traditional cellular network,it guarantees a senseless mobility and continuous service for users by building a dynamic small cell group.This thesis focuses on two small cell selection schemes which can enhance user mobility,including a sojourn time estimation based and an uplink measurement based small cell selection schemes.It can be applied to small cell deployment in future 5G and this topic it is of great practical significance and value.This thesis mainly contains two parts:To reduce the unnecessary handover in dense deployment small cell scenario,the sojourn time in the neighboring candidate small cell is calculated by the local service center.The small cell in the virtual cell is selected based on the estimated sojourn time and the key factors of cell sojourn time are analyzed using tools of stochastic geometry.The effectiveness of the sojourn time based small cell selection scheme in reducing unnecessary is verified by simulation.To alleviate the battery consumption of users caused by traditional downlink measurement in UDN,we explore the uplink measurement based small cell selection in UCN,including the supported user number of sounding reference signal from different dimensions and key parameters on the performance of uplink based small cell selection.The simulation results verify the feasibility of uplink based small cell selection and it can be used to UCN parameter configuration in 5G uplink measurement network.