AI 中文总结
针对双频亚太赫兹分布式系统的RU切换同步瓶颈，提出基于深度学习的算法，利用10 GHz以下信道特性推断延迟以计算定时提前量，实现RU的物理层无缝切换，无同步相关延迟。
AI 中文摘要
双频无线架构通过10 GHz以下频段传输控制信息，同时将亚太赫兹（sub-THz）频段保留用于高速数据链路，可显著提升容量。但这类系统存在关键瓶颈：定时同步。由于亚太赫兹射频单元（RU）的窄波束，当双频用户设备（UE）旋转或移动时，需在亚太赫兹RU之间切换传输。该切换需重新校准上行（UL）和下行（DL）传输的定时，以避免通信中断。此外，对于亚太赫兹RU，该方法会带来显著的开销和延迟，尤其在切换频繁时。10 GHz以下频段对UE移动性的抗扰性更强，适合用于控制信令。因此，本文提出一种基于深度学习的算法，利用10 GHz以下信道特性推断亚太赫兹RU到UE的传播延迟，该推断出的延迟用于计算上行传输的定时提前量，无需双向同步。仿真结果表明，可在物理层实现RU的无缝切换，不会产生任何与同步相关的延迟。
英文摘要
Dual-band wireless architectures transmit the control information over the sub-10 GHz while reserving sub-THz for high data rate links, offering notable capacity gains. However, a critical bottleneck in such systems is timing synchronization. Due to the narrow beams of the sub-THz radio units (RUs), when the dual-band user equipment (UE) rotates or moves, it becomes necessary to switch the transmission between the sub-THz RUs. This switching requires recalibrating the timing of uplink (UL) and downlink (DL) transmissions to prevent communication disruptions. Moreover, for sub-THz RUs, the method introduces significant overhead and latency, especially when switches are frequent. Leveraging the reliable sub-10 GHz band offers greater resilience to UE mobility, making it suitable for control signalling. Thus, in this paper, we propose a deep learning-based algorithm that infers the propagation delay from the sub-THz RUs to the UE using sub-10 GHz channel characteristics. The inferred delay is used for calculating the timing advance for UL transmissions without the need for two-way synchronization. Simulation results show that the RU switch can be made seamless at the physical layer, without incurring any synchronization-related latency.
CommentsAccepted for presentation at IEEE VTC2026-Spring
