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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

FIG. 10 illustrates an example process performed by the network entity to implement block 920, i.e., determine the network total GD. At 1010, the network entity (e.g., a serving node) may schedule self-transmit and self-receive resources for transmit and receive antennas. The self-transmit resources may comprise physical layer resources, and the self-receive resources may also comprise physical layer resources. If necessary, at 1020, the network entity notifies the UEs of the scheduled resources (e.g., in downlink control information (DCI)) so that the UEs will not interfere.

At 1030, the network entity may transmit a test signal from the transmit antenna at transmit time tt. The transmit time tt is in the digital domain and may correspond to a frame, subframe, or a slot of the self-transmit resource in which symbols of the test signal are scheduled for transmission. The test signal may be a simulated RTTR signal. At 1040, the network entity may listen on the receive antenna and detect the reception of the test signal at receive time tr. The receive time tr is in the digital domain and may correspond to a frame, subframe, or a slot of the self-receive resource in which received symbols contained therein are recognized as the symbols of the test signal.

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