Abstract
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 TTT = 40 ms and offset = −1 dB.
Highlights
IntroductionThe architecture of user-centric network (UCN) with the split of control and user plane (C/Uplane) is proposed, and the concepts of the anchor small base stations (SBSs) and the slave SBS are introduced, and SBS-level mobility procedure and cell-level mobility procedure are designed correspondingly
Ubiquitous wireless access is one of the prominent features in six-generation (6G) wireless communication networks, so the number of Femto Access Points (FAPs) will grow exponentially in order to address the high traffic demands caused by more and more smart devices [1]
This paper proposes a soft mobility model for user-centric network (UCN) to reduce the number of HOs and handover failures (HOFs) without extra resource occupancy of dual connectivity (DC), where multiple small base stations (SBSs) around user equipment (UE) form a cell for transparent handover
Summary
The architecture of UCN with the split of control and user plane (C/Uplane) is proposed, and the concepts of the anchor SBS and the slave SBS are introduced, and SBS-level mobility procedure and cell-level mobility procedure are designed correspondingly. Different from the mobility procedure in the 5G system, it is needed to redesign the handover procedure separately when UE changes the slave SBS and anchor SBS, including SBS-level mobility procedure and cell-level mobility procedure, and transparent handover between slave SBSs is realized with user configuration duplication and measurement enhancement (iii) UE-controlled mobility management is applied for its scalability instead of network-controlled mobility management. This paper proposes a soft mobility model for UCN to reduce the number of HOs and handover failures (HOFs) without extra resource occupancy of dual connectivity (DC), where multiple SBSs around UE form a cell for transparent handover.
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