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Handling of radio frequency front-end group delays for round trip time estimation

專(zhuān)利號(hào)
US11159972B2
公開(kāi)日期
2021-10-26
申請(qǐng)人
QUALCOMM Incorporated（US CA San Diego）
發(fā)明人
Sony Akkarakaran; Tao Luo; Joseph Binamira Soriaga; Alexandras Manolakos; Naga Bhushan; Guttorm Ringstad Opshaug; Sven Fischer
IPC分類(lèi)
H04W24/10; H04W64/00; H04W72/04
技術(shù)領(lǐng)域
rttr,ue,rttm,gd,rtt,network,may,gnodebs,signal,gnodeb
地域： CA CA San Diego

摘要

Disclosed are techniques for handling of radio frequency (RF) front-end group delays for round trip time (RTT) estimation. In an aspect, a network entity determines a network total group delay (GD) and a user equipment (UE) determines a UE total GD. The network entity transmits one or more RTT measurement (RTTM) signals to the UE. Each RTTM signal includes a RTTM waveform. The UE determines one or more one or more RTT response (RTTR) payloads for one or more RTTR signals. Each RTTR signal also includes a RTTR waveform. The UE transmits the RTTR signal(s) to the network entity. For each RTTR signal, a transmission time of the RTTR waveform and/or the RTTR payload is/are determined based on the UE total GD. The network entity determines a RTT between the UE and the network entity based on the RTTM signal(s), the RTTR signal(s), and the network total GD.

說(shuō)明書(shū)

During reception, the gNodeBs 202-206 record/report the beam index on which the RTT signals were received from the UE 102, and include that information in the RTTR payload, along with the timestamps (e.g., turn-around time) described earlier. In case the gNodeBs 202-206 have fewer RF chains than the number of receive beams it uses (as a single hardware receiver chain may be configurable to generate multiple receive beams), the UE 102 may be commanded to repeat the RTTM/RTTR signals multiple times, so that the gNodeB may sequentially cycle through the set of all receive beams that may be used to receive the RTT signals from the UE 102, based on its limited base-band processing capabilities. Note that different beam directions would result in different directional gains for the different multipath delays. Since RTT and OTDOA positioning methods rely on estimating the direct delay corresponding to the line-of-sight (LOS) path between the transmitter and receiver, it is of interest to identify the earliest arriving path, and this identification may be improved by using different transmit and receive beams.

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