公开(公告)号：US20240250741A1

公开(公告)日：2024-07-25

申请号：US18157682

申请日：2023-01-20

Applicant: Apple Inc.

Inventor： Sharad Sambhwani ,  Boqiang Fan ,  Ankit Bhamri ,  Mithat C Dogan

IPC: H04B7/145 ,  H04B7/0426

CPC classification number: H04B7/145 ,  H04B7/043

Abstract: A communication system may include a base station (BS), user equipment (UE), and a set of reconfigurable intelligent surfaces (RIS's). The RIS's, the UE, and the BS may communicate using a control RAT and a data RAT. The BS may transmit downlink (DL) signals to the UE device via reflection off a DL RIS. The UE device may transmit uplink (UL) signals to the BS via reflection off a UL RIS. This may optimize wireless performance in situations where reflecting the UL and DL signals off the same RIS would limit performance under the current data RAT channel conditions. The BS and the UE device may use channel measurements of the control RAT at the RIS's to select the UL RIS and the DL RIS. This may significantly reduce overhead required to identify the UL and DL RIS's relative to scenarios where exhaustive beam training is used.