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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)

Note that each GD(i,j,k)=txgd(i,k)+rxgd(j,k) where txgd(i,k) is the group delay for the transmit chain using the i-th antenna and rxgd(j,k) is the group delay for the receive chain using the j-th antenna. For each k, there are 2N variables txgd(i,k), rxgd(i,k) whereas there are N*(N?1) measurable values of GD(i,j,k) corresponding to the ordered (i,j) pairs where i≠j, with i, j representing respectively the transmit and receive antenna indices. Thus, if N>2, since N*(N?1)>2N, there are more equations than unknowns, allowing the individual delays txgd(i,k) and rxgd(j,k) to be determined if all of the total GD(i,j,k) are measured. For N=2, the individual delays txgd(i,k) and rxgd(j,k) may be estimated under an assumption or approximation that they are same for both antennas, i.e., independent of i,j.

This can be useful for FDD devices, which usually communicate with a receive frequency kR and transmit frequency kT≠kR, for which the total group delay of interest for RTT measurement is thus txgd(i,kT)+rxgd(j,kR). Since measurements GD(i,j,k) made using a receive antenna to receive the transmission from a transmit antenna on the same device are necessarily at the same frequency k, they do not directly yield the above-mentioned quantity of interest txgd(i,kT)+rxgd(j,kR). Nonetheless, they can be used to determine the individual values txgd(i,k) and rxgd(j,k), from which this quantity may then be computed.

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