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

專利號
US11159972B2
公開日期
2021-10-26
申請人
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
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.

說明書

During the uplink subframes 706 and 708, each gNodeB in the neighborhood (i.e., within communication range of the UE 102; gNodeBs 202-206 in the example of FIG. 7) measures the RTTM arrival time (e.g., t2) and calculates the actual RTTM arrival time (e.g., t2′) of each received RTTM. The serving gNodeB instructs the UE 102 to scan for/receive RTTR signals from the gNodeBs 202-206 on a subsequent downlink subframe, which occurs in the example of FIG. 7 during the downlink subframes 714 and 716. The RTTR signal from each gNodeB 202-206 includes the actual gNodeB turn-around time (t3′?t2′) and/or the measured gNodeB turn-around time (t3?t2). In an aspect, the RTTR waveforms may be wideband signals to enable the UE 102 to make precise timing measurements.

The UE 102, and each UE in the neighborhood (e.g., all UEs within communication range of the serving gNodeB and gNodeBs 202-206), decodes the RTTR signals from the gNodeBs 202-206 during the downlink subframe 712, and also measures the RTTR arrival time t4 of the RTTR signal from the respective gNodeB(i) of the gNodeBs 202-206 and calculates the actual RTTR waveform arrival time t4′ of the respective RTTR signals.

權(quán)利要求

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