公开(公告)号：US20210044472A1

公开(公告)日：2021-02-11

申请号：US16683162

申请日：2019-11-13

Applicant: QUALCOMM Incorporated

Inventor： Alexander DOROSENCO ,  Carl HARDIN ,  Joseph Patrick BURKE ,  Joseph Binamira SORIAGA ,  Jay KING

IPC: H04L27/26 ,  H03L7/085 ,  H04W56/00

Abstract: Phase variations between a transmitter (TX) waveform and a receiver (RX) waveform produced by a TX Phase-Locked-Loop (PLL) and a RX PLL, respectively, is a source of error in processing delay calibration used, e.g., in Round Trip Time (RTT) estimation. While a TX waveform and a RX waveform have a constant phase delay while in steady state conditions, during transient times, e.g., at start up or reset, the phase delay may vary by as much as ±180°, which at baseband frequencies of 50 MHz, introduces a random delay variations of as much as ±10 nsec, which is undesirable for fine position estimation using RTT. The phase delay variation between the TX waveform and RX waveform may be reduced or eliminated using a phase correction signal generated using the output signals of the TX PLL and RX PLL.

公开(公告)号：US20210075573A1

公开(公告)日：2021-03-11

申请号：US16795338

申请日：2020-02-19

Applicant: QUALCOMM Incorporated

Inventor： Alexandros MANOLAKOS ,  Alexander DOROSENCO ,  Jay KING ,  Joseph Binamira SORIAGA ,  Joseph Patrick BURKE

IPC: H04L5/00 ,  H04W72/04

Abstract: Disclosed are techniques for reporting a group delay-per-frequency lookup table for transmit and receive beams. In an aspect, a user equipment (UE) receives, from a transmission-reception point (TRP), a first downlink reference signal on at least one downlink reference signal resource using a downlink receive beam, transmits, to the TRP, an uplink reference signal on at least one uplink reference signal resource using an uplink transmit beam, determines a parameter representing a difference between a reception time of the first downlink reference signal and a transmission time of the uplink reference signal, transmit the parameter to a network entity, and transmits, to the network entity, a first lookup table or an identifier of the first lookup table, wherein the first lookup table represents per-frequency group delay information for the downlink receive beam and/or the uplink transmit beam.