US-12625222-B2 - Mapping of reference signal measurements to angles of departure

US12625222B2US 12625222 B2US12625222 B2US 12625222B2US-12625222-B2

Abstract

In an aspect, a UE determines a mapping a mapping between (i) one or more measurements of one or more reference signals based on one or more transmit codebooks and (ii) one or more angles of departure (AoDs) associated with transmission of the one or more reference signals. The UE transmits an indication of the mapping to a position estimation entity. The position estimation entity determines a positioning estimate of the UE based at least in part upon the one or more AoDs.

Inventors

Alexandros Manolakos
WEIMIN DUAN
Jay Kumar Sundararajan
Naga Bhushan
Krishna Kiran Mukkavilli
Tingfang JI
Wanshi Chen

Assignees

QUALCOMM INCORPORATED

Dates

Publication Date: 20260512
Application Date: 20211201
Priority Date: 20210208

Claims (20)

1 . A method of operating a user equipment (UE), comprising: receiving configuration of one or more reference signals to be measured; receiving configuration of one or more transmit codebooks associated with the reference signals to be measured; determining one or more measurements of the one or more reference signals based on the one or more transmit codebooks; determining a mapping between (i) the one or more measurements of the one or more reference signals and (ii) one or more angles of departure (AoDs) associated with transmission of the one or more reference signals; and transmitting an indication of the mapping to a position estimation entity.
2 . The method of claim 1 , wherein the mapping is based upon field testing performed in association with one or more test user equipments (UEs), or wherein the mapping is based upon crowd-sourcing in association with one or more UEs, or a combination thereof.
3 . The method of claim 1 , wherein the position estimation entity corresponds to the UE, another UE, a base station, a location management function (LMF), or a combination thereof.
4 . The method of claim 1 , wherein the one or more reference signals comprise one or more sidelink (SL) reference signals, or wherein the one or more reference signals comprise one or more downlink (DL) signals.
5 . The method of claim 1 , wherein the mapping is one of a plurality of mappings between different measurements associated with reception of the one or more reference signals and different respective one or more AoDs associated with transmission of the one or more reference signals.
6 . The method of claim 1 , wherein each measurement is derived using at least one or more Pre-coding Matrix Indicators (PMIs) associated with the one or more transmit codebooks and the one or more reference signals.
7 . The method of claim 1 , wherein the one or more measurements include: one or more Pre-coding Matrix Indicators (PMIs) that maximize a received power of the reference signal on at least one path, or one or more relative reference signal received power (RSRP) measurements, or one or more time of arrival (TOA) measurements, or a combination thereof.
8 . The method of claim 1 , wherein the one or more AoDs comprise: a single Azimuth AoD or a single range of Azimuth AoDs, or multiple Azimuth AoDs or multiple ranges of Azimuth AoDs, or a single Zenith AoD or a single range of Zenith AoDs, or multiple Zenith AoDs or multiple ranges of Zenith AoDs, or a single Zenith and Azimuth AoD or a single range of Zenith and Azimuth AoDs, or multiple Zenith and Azimuth AoDs or multiple ranges of Zenith and Azimuth AoDs, or a combination thereof.
9 . The method of claim 8 , wherein the multiple Azimuth AoDs, the multiple Zenith AoDs, the multiple Zenith and Azimuth AoDs, the multiple ranges of Azimuth AoDs, the multiple ranges of Zenith AoDs, and/or the multiple ranges Zenith and Azimuth AoDs are associated with different multipaths of the one or more reference signals.
10 . The method of claim 1 , wherein the mapping is configured at the UE via unicast or broadcast location assistance data.
11 . The method of claim 1 , wherein the mapping is transmitted to a location management function (LMF) via New Radio Positioning Protocol A (NRPPa) signaling.
12 . The method of claim 1 , further comprising: performing, for one or more other reference signal measurements, formula-based AoD computation in lieu of mapping-based AoD lookup.
13 . The method of claim 1 , wherein the one or more reference signals comprise a reference signal for positioning (RS-P), a channel state indication (CSI)-RS, a synchronization signal block (SSB), a tracking RS (TRS), or a demodulation RS (DMRS).
14 . The method of claim 13 , wherein the one or more reference signals comprise a downlink positioning reference signal (DL-PRS), or wherein the one or more reference signals comprise a sidelink positioning reference signal (SL-PRS).
15 . The method of claim 1 , wherein the mapping is determined so as to weight a first performance characteristic over a second performance characteristic.
16 . The method of claim 15 , wherein the first performance characteristic is associated with spectral efficiency of transmission and the second performance characteristic is associated with a reference signal received power (RSRP) of an earliest path of signal transmission, and the one or more reference signals are associated with communication of data, or wherein the second performance characteristic is associated with spectral efficiency of transmission and the first performance characteristic is associated with a reference signal received power (RSRP) of an earliest path of signal transmission, and the one or more reference signals are associated with positioning of the UE.
17 . The method of claim 1 , wherein the receiving of the configuration of the one or more transmit codebooks comprises receiving a transmit antenna configuration, and deriving the one or more transmit codebooks based on the transmit antenna configuration.
18 . A method of operating a position estimation entity, comprising: receiving, from a user equipment (UE), an indication of a mapping between (i) one or more measurements of one or more reference signals based on one or more transmit codebooks, and (ii) one or more angles of departure (AoDs) associated with transmission of the one or more reference signals; and determining a positioning estimate of the UE based at least in part upon the one or more AoDs.
19 . The method of claim 18 , wherein the mapping is based upon field testing performed in association with one or more test user equipments (UEs), or wherein the mapping is based upon crowd-sourcing in association with one or more UEs, or a combination thereof.
20 . The method of claim 18 , wherein the position estimation entity corresponds to the UE, another UE, a base station, a location management function (LMF), or a combination thereof.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS The present application for patent claims priority to Greek Patent Application No. 20210100083, entitled “MAPPING OF REFERENCE SIGNAL MEASUREMENTS TO ANGLES OF DEPARTURE,” filed Feb. 8, 2021, and is a national stage application, filed under 35 U.S.C. § 371, of International Patent Application No. PCT/US2021/072672, entitled, “MAPPING OF REFERENCE SIGNAL MEASUREMENTS TO ANGLES OF DEPARTURE”, filed Dec. 1, 2021, both of which are assigned to the assignee hereof and are expressly incorporated herein by reference in their entirety. BACKGROUND OF THE DISCLOSURE 1. Field of the Disclosure Aspects of the disclosure relate generally to wireless communications. 2. Description of the Related Art Wireless communication systems have developed through various generations, including a first-generation analog wireless phone service (1G), a second-generation (2G) digital wireless phone service (including interim 2.5G and 2.75G networks), a third-generation (3G) high speed data, Internet-capable wireless service and a fourth-generation (4G) service (e.g., Long Term Evolution (LTE) or WiMax). There are presently many different types of wireless communication systems in use, including cellular and personal communications service (PCS) systems. Examples of known cellular systems include the cellular analog advanced mobile phone system (AMPS), and digital cellular systems based on code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), the Global System for Mobile communications (GSM), etc. A fifth generation (5G) wireless standard, referred to as New Radio (NR), calls for higher data transfer speeds, greater numbers of connections, and better coverage, among other improvements. The 5G standard, according to the Next Generation Mobile Networks Alliance, is designed to provide data rates of several tens of megabits per second to each of tens of thousands of users, with 1 gigabit per second to tens of workers on an office floor. Several hundreds of thousands of simultaneous connections should be supported in order to support large sensor deployments. Consequently, the spectral efficiency of 5G mobile communications should be significantly enhanced compared to the current 4G standard. Furthermore, signaling efficiencies should be enhanced and latency should be substantially reduced compared to current standards. SUMMARY The following presents a simplified summary relating to one or more aspects disclosed herein. Thus, the following summary should not be considered an extensive overview relating to all contemplated aspects, nor should the following summary be considered to identify key or critical elements relating to all contemplated aspects or to delineate the scope associated with any particular aspect. Accordingly, the following summary has the sole purpose to present certain concepts relating to one or more aspects relating to the mechanisms disclosed herein in a simplified form to precede the detailed description presented below. In an aspect, a method of operating a user equipment (UE) includes: receiving configuration of one or more reference signals to be measured; receiving configuration of one or more transmit codebooks associated with the reference signals to be measured; determining one or more measurements of the one or more reference signals based on the one or more transmit codebooks; determining a mapping between (i) the one or more measurements of the one or more reference signals and (ii) one or more angles of departure (AoDs) associated with transmission of the one or more reference signals; and transmitting an indication of the mapping to a position estimation entity. In some aspects, the mapping is based upon field testing performed in association with one or more test user equipments (UEs), or the mapping is based upon crowd-sourcing in association with one or more UEs, or a combination thereof. In some aspects, the position estimation entity corresponds to the UE, another UE, a base station, a location management function (LMF), or a combination thereof. In some aspects, the one or more reference signals comprise one or more sidelink (SL) reference signals, or the one or more reference signals comprise one or more downlink (DL) signals. In some aspects, the mapping is one of a plurality of mappings between different measurements associated with reception of the one or more reference signals and different respective one or more AoDs associated with transmission of the one or more reference signals. In some aspects, each measurement is derived using at least one or more Pre-coding Matrix Indicators (PMIs) associated with the one or more transmit codebooks and the one or more reference signals. In some aspects, the one or more measurements include: one or more Pre-coding Matrix Indicators (PMIs) that maximize a received power of the reference signal on at least one path, or one or more relative reference signa