US-20260129605-A1 - ENHANCEMENT ON OPEN LOOP POWER CONTROL FOR ATG UES

US20260129605A1US 20260129605 A1US20260129605 A1US 20260129605A1US-20260129605-A1

Abstract

The disclosure relates to enhancement on open loop power control for ATG UEs. In some embodiments, there is provided a user equipment (UE), comprising at least one antenna, at least one radio coupled to the at least one antenna and a processor coupled to the at least one radio. The processor is configured to perform location based open loop power control comprising: receiving, from a base station, a location and an antenna gain pattern of the base station; determining a location of the UE; and determining an initial transmission power of the UE for the location based open loop power control based on the location of the UE, the location of the base station and the antenna gain pattern of the base station.

Inventors

Yuexia Song
Manasa Raghavan
Yang Tang
Dawei Zhang
Xiang Chen
Qiming Li
Jie Cui
Rolando E Bettancourt Ortega

Assignees

APPLE INC.

Dates

Publication Date: 20260507
Application Date: 20221104

Claims (17)

1 . A user equipment (UE), comprising: at least one antenna; at least one radio coupled to the at least one antenna; and a processor coupled to the at least one radio; wherein the processor is configured to perform location based open loop power control comprising: receiving, from a base station, a location and an antenna gain pattern of the base station; determining a location of the UE; and determining an initial transmission power of the UE for the location based open loop power control based on the location of the UE, the location of the base station and the antenna gain pattern of the base station.
2 . The UE of claim 1 , wherein the processor is further configured to: calculate a distance between the base station and the UE based on the location of the UE and the location of the base station; calculate a first pathloss based on the distance according to a Line of Sight (LOS) propagation channel model; determine an angle of arrival from the base station based on the location of the base station and the location of the UE; calculate an antenna gain between the base station and the UE at the angle of arrival based on the angle of arrival and the antenna gain pattern of the base station; determine a second pathloss between the base station and the UE based on the first pathloss and the antenna gain; and apply the second pathloss to determine the initial transmission power of the UE for the location based open loop power control.
3 . The UE of claim 2 , wherein the processor is further configured to apply the second pathloss to determine the initial transmission power of the UE for the location based open loop power control by determining a minimum of the following as the initial transmission power of the UE: (i) a maximum output power configured by the UE, and (ii) a product of an expected receiving power at the base station and the second pathloss.
4 . The UE of claim 1 , wherein the processor is further configured to: determine an altitude of the UE; compare the altitude to an altitude threshold; and determine whether to adopt the location based open loop power control according to a comparing result.
5 . The UE of claim 4 , wherein the processor is further configured to: in response to the comparing result indicating that the determined altitude is larger than the altitude threshold, determine to adopt the location based open loop power control.
6 . The UE of claim 4 , wherein the processor is further configured to: in response to the comparing result indicating that the determined altitude is not larger than the altitude threshold, determine to adopt Reference Signal Receiving Power (RSRP) measurement based open loop power control.
7 . The UE of claim 4 , wherein the processor is further configured to: receive the altitude threshold broadcast by the base station.
8 . The UE of claim 1 , wherein the processor is further configured to: receive, from the base station, an expected receiving power at the base station.
9 . The UE of claim 1 , wherein the processor is further configured to: perform Physical Random Access Channel (PRACH) transmission with the initial transmission power.
10 . The UE of claim 1 , wherein the UE is an Air to Ground (ATG) UE that is Global Navigation Satellite System (GNSS) capable.
11 . A method, comprising: by a user equipment (UE), performing location based open loop power control comprising: receiving, from a base station, a location and an antenna gain pattern of the base station: determining a location of the UE: determining an initial transmission power of the UE for the location based open loop power control based on the location of the UE, the location of the base station and the antenna gain pattern of the base station.
12 - 13 . (canceled)
14 . A base station (BS), comprising: at least one antenna; at least one radio coupled to the at least one antenna; and a processor coupled to the at least one radio; wherein the processor is configured to: determine a location and an antenna gain pattern of the base station; and broadcast to a UE the location and the antenna gain pattern of the base station, the location and the antenna gain pattern of the base station being used by the UE along with a location of the UE to determine an initial transmission power of the UE for location based open loop power control.
15 . The BS of claim 14 , wherein the processor is further configured to: broadcast an altitude threshold, wherein the UE determines whether to adopt the location based open loop power control according to a comparison result between an altitude of the UE and the altitude threshold.
16 . The BS of claim 14 , wherein the processor is further configured to: broadcast a downlink reference signal power and an expected receiving power at the base station.
17 . The BS of claim 14 , wherein the UE is an ATG UE that is GNSS capable.
18 - 20 . (canceled)

Description

TECHNICAL FIELD This application relates generally to wireless communication systems, including user equipments (UEs), base stations (BSs), methods, apparatus, and medium for enhancement on open loop power control for Air-to-Ground (ATG) UEs. BACKGROUND Wireless mobile communication technology uses various standards and protocols to transmit data between a base station and a wireless communication device. Wireless communication system standards and protocols can include, for example, 3rd Generation Partnership Project (3GPP) long term evolution (LTE) (e.g., 4G), 3GPP new radio (NR) (e.g., 5G), and IEEE 802.11 standard for wireless local area networks (WLAN) (commonly known to industry groups as Wi-Fi®). As contemplated by the 3GPP, different wireless communication systems standards and protocols can use various radio access networks (RANs) for communicating between a base station of the RAN (which may also sometimes be referred to generally as a RAN node, a network node, or simply a node) and a wireless communication device known as a user equipment (UE). 3GPP RANs can include, for example, global system for mobile communications (GSM), enhanced data rates for GSM evolution (EDGE) RAN (GERAN), Universal Terrestrial Radio Access Network (UTRAN), Evolved Universal Terrestrial Radio Access Network (E-UTRAN), and/or Next-Generation Radio Access Network (NG-RAN). Each RAN may use one or more radio access technologies (RATs) to perform communication between the base station and the UE. For example, the GERAN implements GSM and/or EDGE RAT, the UTRAN implements universal mobile telecommunication system (UMTS) RAT or other 3GPP RAT, the E-UTRAN implements LTE RAT (sometimes simply referred to as LTE), and NG-RAN implements NR RAT (sometimes referred to herein as 5G RAT, 5G NR RAT, or simply NR). In certain deployments, the E-UTRAN may also implement NR RAT. In certain deployments, NG-RAN may also implement LTE RAT. A base station used by a RAN may correspond to that RAN. One example of an E-UTRAN base station is an Evolved Universal Terrestrial Radio Access Network (E-UTRAN) Node B (also commonly denoted as evolved Node B, enhanced Node B, eNodeB, or eNB). One example of an NG-RAN base station is a next generation Node B (also sometimes referred to as a or g Node B or gNB). A RAN provides its communication services with external entities through its connection to a core network (CN). For example, E-UTRAN may utilize an Evolved Packet Core (EPC), while NG-RAN may utilize a 5G Core Network (5GC). Frequency bands for 5G NR may be separated into two or more different frequency ranges. For example, Frequency Range 1 (FR1) may include frequency bands operating in sub-6 GHz frequencies, some of which are bands that may be used by previous standards, and may potentially be extended to cover new spectrum offerings from 410 MHz to 7125 MHz. Frequency Range 2 (FR2) may include frequency bands from 24.25 GHz to 52.6 GHz. Bands in the millimeter wave (mmWave) range of FR2 may have smaller coverage but potentially higher available bandwidth than bands in the FR1. Skilled persons will recognize these frequency ranges, which are provided by way of example, may change from time to time or from region to region. SUMMARY Embodiments relate to user equipments (UEs), base stations, methods, apparatus, and medium for enhancement on open loop power control for ATG UEs. In one aspect, there is provided a user equipment (UE), comprising at least one antenna, at least one radio coupled to the at least one antenna and a processor coupled to the at least one radio. The processor is configured to perform location based open loop power control comprising: receiving, from a base station, a location and an antenna gain pattern of the base station; determining a location of the UE; and determining an initial transmission power of the UE for the location based open loop power control based on the location of the UE, the location of the base station and the antenna gain pattern of the base station. In another aspect, there is provided a method, comprising: by a user equipment (UE), performing location based open loop power control comprising: receiving, from a base station, a location and an antenna gain pattern of the base station; determining a location of the UE; determining an initial transmission power of the UE for the location based open loop power control based on the location of the UE, the location of the base station and the antenna gain pattern of the base station. In another aspect, there is provided an apparatus for operating a user equipment (UE), comprising: a processor configured to cause the UE to perform a method as recited above. In another aspect, there is provided a non-transitory computer-readable memory medium storing program instructions which, when executed at a user equipment (UE), cause the UE to perform a method as recited above. In another aspect, there is provided a base station (BS), comprising at least one antenna, a