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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

Referring back to FIG. 9, at 930, the network entity may schedule RTTM resources for transmitting one or more RTTM signals to the UE, and also schedule RTTR resources for receiving one or more RTTR signals from the UE. The RTTM resources may comprise downlink (DL) physical layer resources. For example, CSIRS, PRS, TRS, and/or SSB) may be configured for use as the RTTM waveform. The RTTR resources may comprise uplink (UL) physical layer resources. For example, uplink SRS may be configured for use as the RTTR waveform. As another example, PUCCH and/or PUSCH resources may be allocated to carry the RTTR payload. The PUCCH/PUSCH may be sized based on the payload (e.g., may be sized based on the amount of UE turn-around times and/or UE Rx?Tx time differences to be reported, amount of DL timing information to be reported, etc.).

For convenience and brevity, term “response delay” will be used to refer to turn-around time and/or Rx?Tx time differences. Thus, “measured response delay” may refer to measured turn-around time (t3?t2) and/or measured Rx?Tx time difference (t2?t3) for both the UE and the network entity. Similarly, “actual response delay” may refer to actual turn-around time (t3′?t2′) and/or actual Rx?Tx time difference (t2′?t3′) UE and the network entity. Then at 930, it may be said that the PUCCH/PUSCH may be sized based on the amount of UE response delays to be reported, amount of DL timing information to be reported, etc.).

At 940, the network entity may notify the UE, e.g., by sending a control signal, of the scheduled RTTM resources so that the UE can properly listen for the RTTM waveforms. The control signal may also notify the UE of the scheduled RTTR resources so that the UE can transmit the RTTR waveforms and the RTTR payload on the proper resources.

權(quán)利要求

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