5G SA网络的移动性管理研究

Research on the mobility management in 5G SA network

SA是5G网络演进发展的目标网络架构,采用全新的网络部署,在相当长的一段时间内会和现网中的LTE网络共存。为了保证UE在移动过程中享受无中断的服务,需要网络提供高效的移动性管理。移动性管理根据UE状态可以分为小区重选、切换以及重定向。根据服务小区的变更是否跨系统,又可以分为系统内移动性管理和系统间移动性管理。为了达到切换0 ms的中断时延,R16又提出了几种移动性管理增强的解决方案。重点介绍了NR之间的移动性管理、4G/5G之间的互操作以及R16中的移动性管理增强方案,为5G SA网络的移动性管理优化提供参考。

SA is the final 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 UEs enjoy uninterrupted service in the mobile process,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 0 ms 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.