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

專(zhuān)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(lèi)
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(shū)

Such an approach may require measuring the GD(i,j,k) for the (i,j) ordered pairs for both k=kT and k=kR, which in turn involves one or more of transmitting at frequency kR which differs from the usual transmit frequency kT, and likewise receiving at frequency kT which differs from the usual receive frequency kR. In this instance, an additional receiver module may be provided to receive at the transmit frequency kT, to enable determining txgd(i,kT). Likewise, an additional transmitter module may be provided to transmit at the receive frequency kR, to enable determining rxgd(j,kR).

Further, transmissions by the device at the receive frequency may interfere with reception by other devices at that same frequency. For example, assume that UE1 transmits at its receive frequency kR to measure rxgd(j,kR). If UE2 receives this transmission at frequency kR, it would be difficult for UE2 to receive its downlink transmissions from the base station at frequency kR, especially if UE2 is very close to UE1, in which case downlink reception may be completely jammed. An analogous situation can also happen at the gNBs, where an FDD gNB transmitting in its receive band creates interference to other gNBs attempting to receive signals from UEs they serve; the only difference being that the transmit and receive bands are now interchanged with respect to that of the UE.

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