公开(公告)号：US20230023632A1

公开(公告)日：2023-01-26

申请号：US17949983

申请日：2022-09-21

Applicant: Apple Inc.

Inventor： Carlos H. Aldana ,  Yongjun Kwak ,  Yingyang Li ,  Salvatore Talarico

IPC: H04W74/08 ,  H04W72/12

Abstract: Methods and apparatus are disclosed for a UE and its serving base station in 5G NR systems to signal channel scan or channel sensing to allow channel occupancy time (COT) sharing before transmissions. The COT sharing may be initiated by the base station or by the UE by asserting a CCA indication to enable channel sensing by a UE or base station, respectively. When the UE receives and decodes the asserted CCA indication during downlink transmission, the UE may perform channel sensing during a short interframe space (SIFS) between the downlink transmission and a scheduled uplink transmission. When the UE detects that the sensed RF energy across an intended transmission band is greater than an energy detect threshold, the UE may refrain from transmitting during the scheduled uplink transmission. Otherwise, or when the CCA indication is de-asserted, the UE may transmit during the scheduled uplink transmission without performing channel sensing.

公开(公告)号：US11490417B2

公开(公告)日：2022-11-01

申请号：US16924123

申请日：2020-07-08

Applicant: Apple Inc.

Inventor： Salvatore Talarico ,  Yongjun Kwak ,  Yingyang Li ,  Carlos H. Aldana

IPC: H04W74/08 ,  H04W16/14 ,  H04W72/12 ,  H04W88/08

Abstract: Apparatuses, systems, and methods are disclosed for frame based equipment (FBE) framework for new radio (NR) systems operating on the unlicensed spectrum. A processor for a base station performs a first clear channel assessment (CCA) using Category-1 (CAT-1) or CAT-2 listen-before-talk (LBT) on an unlicensed spectrum. The processor transmits first downlink (DL) data to one or more user equipments (UEs) within a fixed frame period (FFP) in accordance with a frame based equipment (FBE) framework for new radio (NR) on the unlicensed spectrum. The base station operates as an initiating device and the one or more UEs operate as responding devices. The processor performs a second CCA responsive to a gap of X orthogonal frequency-division multiplexing (OFDM) symbols between a DL burst and an uplink (UL) burst being greater than a threshold gap. The processor transmits second DL data within the FFP responsive to performing the second CCA.