查看文章

Beam management under blockage has been challenging for millimeter wave communication relying on directional links. The baseline beam management protocols in 5G new radio (NR) are not able to predict and avoid the beam blockage timely, leading to significant link quality degradation and beam switching delays. In this paper, we propose a new dual- beam-sweeping-procedure (DBSP) scheme as well as a proactive blockage prediction and fast beam switching strategy at the user side. Specifically, we propose to only exploit existing resources in 5G NR standards and allocate them for DBSP, i.e., the regular beam sweeping procedure in 5G NR as well as an additional serving beam pair link (BPL) monitoring procedure. The DBSP then facilitates the user-side proactive blockage prediction. Once the beam blockage instance is predicted, users could determine candidate BPL earlier for fast beam switching so …