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

專利號(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
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

This can also involve reducing, limiting or altering other parameters associated with scheduled transmissions during the gap. For example, the MCS may be limited. In another example, the UE may choose a transmit beamformer that requires fewer number of antenna elements or panels, freeing up other antenna elements or panels for reception. The reduction in beamforming gain can be compensated for by increasing transmit power, either by an explicit override of the power control formula during the gap, or by existing power control mechanism in which the downlink pathloss measured increases because the same set of fewer antenna elements is also used to form the beam used as downlink pathloss reference for the power control loop.

At 1260, the UE may determine the UE total GD based on the transmit and receive times tt, tr. As indicated above with respect to FIGS. 5 and 10, the transmit time tr may represent 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 may represent a time just subsequent to the conversion of the received RF signal back to the digital symbols. Thus, the UE total GD, defined as a sum of the UE transmission GD and the UE 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 UE total GD can be reduced to (tr?tt).

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