公开(公告)号：US20210306834A1

公开(公告)日：2021-09-30

申请号：US17264685

申请日：2019-07-31

Applicant: Apple Inc.

Inventor： Wenting CHANG ,  Huaning NIU ,  Salvatore TALARICO ,  Qiaoyang YE ,  Rongrong SUN

IPC: H04W4/80 ,  H04L5/00 ,  H04L27/26 ,  H04W72/04

Abstract: Embodiments of the present disclosure provide for narrowband reference signals transmission. A base station is configured to: generate downlink transmissions for unlicensed Internet of things (U-IoT) communication, the downlink transmissions to include an anchor segment on a first plurality of subframes and a data segment on a second plurality of subframes, wherein the anchor segment includes a narrowband reference signal (NRS) configured to be transmitted at a first transmit power by the base station, to facilitate time or frequency tracking and cause transmission of the downlink frame for the U-IoT communication. And a user equipment is configured to receive the NRSs transmitted by the base station and process transmissions based on reception of the NRSs.