Frequency range 2 (FR2) has become an integral part of 5G networks to fulfill the ever-increasing demand for data hungry-applications. However, radio signals in FR2 experience high path and diffraction loss, which also pronounces the problem of inter and intra-cell interference. As a result, both the serving and target links are affected, leading to radio link failures (RLFs) and handover failures (HOFs), respectively. To address this issue, multi-panel user equipment (MPUE) is proposed for 5G-Advanced whereby multiple spatially distinct antenna panels are integrated into the UE to leverage gains from antenna directivity. It also opens the possibility of using UE-side Rx-beamforming for each panel. In this paper, three different Rx-beamforming approaches are proposed to improve the serving link, the target link, and the handover process for an MPUE equipped with three directional panels. Thereafter, the mobility performance is analyzed in a system-level simulation for a multi-beam FR2 network. Results have shown that the proposed schemes can help reduce RLFs by 53\% and HOFs by 90\%.

翻译：频率范围2（FR2）已成为5G网络不可或缺的组成部分，以满足日益增长的高数据需求应用。然而，FR2中的无线电信号会经历较高的路径损耗与衍射损耗，这进一步加剧了小区内及小区间干扰问题。由此，服务链路和目标链路均受到影响，分别导致无线链路失败（RLF）与切换失败（HOF）。为解决此问题，5G-Advanced提出了多面板用户设备（MPUE）方案，通过将多个空间分布的天线面板集成到UE中，以利用天线方向性带来的增益。这也为每个面板使用UE侧接收波束赋形提供了可能。本文针对配备三个定向面板的MPUE，提出了三种不同的接收波束赋形方法，以改善服务链路、目标链路及切换过程。随后，在多波束FR2网络的系统级仿真中对移动性能进行了分析。结果表明，所提方案可将RLF降低53%，HOF降低90%。