Research on 5G SA Mobility Management

SA is the target network architecture of 5G network evolution and development, which adopts a brand new network deployment. But it will coexist with current LTE networks for quite a long time. In order to ensure that UE enjoy uninterrupted service in the mobile procedure, the network needs to provide efficient mobility management. Mobility management can be divided into cell reselection, handover, and redirection based on UE state. And it can be divided into intra-system mobility management and inter-system mobility management according to whether the service cells cross the system. To achieve the 0ms interruption delay of handover, R16 had proposed several mobility management enhancement solutions. The paper mainly introduced the mobility management between NR cells, the interoperability between 4G/5G cells and the mobility management enhancement solutions in R16, which provided a reference for the mobility management optimization of 5G SA network.