User-centric network (UCN) is regarded as a promising candidate to approach the challenges of more radio link failures (RLFs) due to the ultradense deployment of small base stations (SBSs) and meet the requirements of ultrahigh throughput, ultrahigh reliability, and ultralow latency for the 6G system. In this paper, soft mobility is proposed for UCN with the split of control and user plane (C/U-plane) and shared physical cell identifier (PCI) to achieve the goal of zero handover failure (HOF) probability, where transparent handover (HO) within a cell is realized with user configuration duplication and measurement enhancement. Specifically, the cell is composed of several SBSs around the user, where one anchor SBS is selected for controlling, and others act as slave SBSs for transmission with duplicated UE configuration from the anchor SBS. Based on the proposed architecture, the user measures downlink channel quality for cells and SBSs distinguishingly, via SS/PBCH Block (SSB) and channel-state information-reference signal (CSI-RS), respectively, and then makes the HO decision. Results show that soft mobility can reduce the number of HOF by about 50% over the current system, and the HOF probability is lower than 1% for  ms and  dB.

中文翻译：

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软移动性：以用户为中心的网络中零切换失败的透明切换

以用户为中心的网络 (UCN) 被认为是解决由于小型基站 (SBS) 的超密集部署而导致的更多无线链路故障 (RLF) 挑战并满足超高吞吐量、超高可靠性和超低功耗要求的有希望的候选网络。 6G系统的延迟。在本文中，针对 UCN 提出了具有分离控制和用户平面 (C/U-plane) 和共享物理小区标识符 (PCI) 的软移动性，以实现零切换失败 (HOF) 概率的目标，其中透明切换 ( HO) 是通过用户配置复制和测量增强来实现的。具体地，该小区由用户周围的若干个SBS组成，其中选择一个锚SBS进行控制，其他作为从SBS使用来自锚SBS的重复UE配置进行传输。基于所提出的架构，用户分别通过 SS/PBCH 块 (SSB) 和信道状态信息参考信号 (CSI-RS) 分别测量小区和 SBS 的下行链路信道质量，然后做出 HO 决策。结果表明，软迁移可以使当前系统的 HOF 数量减少约 50%，并且 HOF 概率低于 1% 毫秒和  D b。