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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
技術領域
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

At 1050, the network entity may determine the network total GD based on the transmit and receive times tt, tr. As indicated above with respect to FIG. 5, the transmit time tt represents a time just prior to the conversion of the digital symbols of the test signal to an RF signal for transmission and the receive time tr represents a time just subsequent to the conversion of the received RF signal back to the digital symbols. Thus, the network total GD, defined as a sum of the network transmission GD and the network reception GD, becomes (tr?tt?ts) where ts accounts for the separation between the transmit and receive antennas. If the separation is negligible, then the network total GD=(tr?tt).

The network entity may perform the process of FIG. 10 multiple times. The network entity may determine the total network GD for different combinations of transmit and receive antennas. If the network entity is part of an FDD system, then frequencies may be taken into account. For example, for a given transmit and receive antenna combination, the process may be performed for each operating frequency f Other factors such as the modulation and coding scheme (MCS) may also be considered.

權利要求

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