WO2023081555A1 - Signalisation de décalage d'horaire commun dans un réseau non terrestre - Google Patents

Signalisation de décalage d'horaire commun dans un réseau non terrestre Download PDF

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Publication number
WO2023081555A1
WO2023081555A1 PCT/US2022/076873 US2022076873W WO2023081555A1 WO 2023081555 A1 WO2023081555 A1 WO 2023081555A1 US 2022076873 W US2022076873 W US 2022076873W WO 2023081555 A1 WO2023081555 A1 WO 2023081555A1
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WO
WIPO (PCT)
Prior art keywords
reference point
satellite
timing offset
time
uplink
Prior art date
Application number
PCT/US2022/076873
Other languages
English (en)
Inventor
Harikumar Krishnamurthy
Xiao Feng Wang
Liangping Ma
Original Assignee
Qualcomm Incorporated
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US17/654,179 external-priority patent/US20230135149A1/en
Application filed by Qualcomm Incorporated filed Critical Qualcomm Incorporated
Publication of WO2023081555A1 publication Critical patent/WO2023081555A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/185—Space-based or airborne stations; Stations for satellite systems
    • H04B7/1851—Systems using a satellite or space-based relay
    • H04B7/18519—Operations control, administration or maintenance
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/185—Space-based or airborne stations; Stations for satellite systems
    • H04B7/1851—Systems using a satellite or space-based relay
    • H04B7/18513—Transmission in a satellite or space-based system
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/004—Synchronisation arrangements compensating for timing error of reception due to propagation delay
    • H04W56/0045—Synchronisation arrangements compensating for timing error of reception due to propagation delay compensating for timing error by altering transmission time

Definitions

  • NTN non-terrestrial network
  • Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasts.
  • Typical wireless communication systems may employ multiple-access technologies capable of supporting communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, or the like).
  • multiple-access technologies include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single-carrier frequency division multiple access (SC- FDMA) systems, time division synchronous code division multiple access (TD-SCDMA) systems, and Long Term Evolution (LTE).
  • LTE/LTE- Advanced is a set of enhancements to the Universal Mobile Telecommunications System (UMTS) mobile standard promulgated by the Third Generation Partnership Project (3GPP).
  • UMTS Universal Mobile Telecommunications System
  • a wireless network may include one or more base stations that support communication for a user equipment (UE) or multiple UEs.
  • a UE may communicate with a base station via downlink communications and uplink communications.
  • Downlink (or “DL”) refers to a communication link from the base station to the UE
  • uplink (or “UL”) refers to a communication link from the UE to the base station.
  • New Radio which may be referred to as 5G, is a set of enhancements to the LTE mobile standard promulgated by the 3GPP.
  • NR is designed to better support mobile broadband internet access by improving spectral efficiency, lowering costs, improving services, making use of new spectrum, and better integrating with other open standards using orthogonal frequency division multiplexing (OFDM) with a cyclic prefix (CP) (CP-OFDM) on the downlink, using CP-OFDM and/or single-carrier frequency division multiplexing (SC-FDM) (also known as discrete Fourier transform spread OFDM (DFT-s-OFDM)) on the uplink, as well as supporting beamforming, multiple -input multiple-output (MIMO) antenna technology, and carrier aggregation.
  • OFDM orthogonal frequency division multiplexing
  • SC-FDM single-carrier frequency division multiplexing
  • MIMO multiple -input multiple-output
  • the UE may include: a transceiver; a memory comprising instructions; and one or more processors.
  • the one or more processors may be configured to execute the instructions and cause the UE to receive, via the transceiver from a network node, signaling indicating one or more common timing offset parameters that are based at least in part on one or more delays between a satellite and a reference point in a non-terrestrial network (NTN).
  • NTN non-terrestrial network
  • the one or more processors may be configured to execute the instructions and cause the UE to determine a transmit time for an uplink signal based at least in part on the one or more common timing offset parameters and a starting time associated with an uplink slot in which the uplink signal is to arrive at the reference point.
  • the one or more processors may be configured to execute the instructions and cause the UE to transmit, via the transceiver, the uplink signal at the transmit time.
  • the network node may include: a transceiver; a memory comprising instructions; and one or more processors.
  • the one or more processors may be configured to execute the instructions and cause the network node to determine one or more delays between a satellite and a reference point in an NTN.
  • the one or more processors may be configured to execute the instructions and cause the network node to transmit, to a UE via the transceiver, signaling indicating one or more common timing offset parameters that are based at least in part on the one or more delays between the satellite and the reference point.
  • Some aspects described herein relate to a method for wireless communication at a UE.
  • the method may include receiving, from a network node, signaling indicating one or more common timing offset parameters that are based at least in part on one or more delays between a satellite and a reference point in an NTN.
  • the method may include determining a transmit time for an uplink signal based at least in part on the one or more common timing offset parameters and a starting time associated with an uplink slot in which the uplink signal is to arrive at the reference point.
  • the method may include transmitting the uplink signal at the transmit time.
  • Some aspects described herein relate to a method for wireless communication at a network node.
  • the method may include determining one or more delays between a satellite and a reference point in an NTN.
  • the method may include transmitting, to a UE, signaling indicating one or more common timing offset parameters that are based at least in part on the one or more delays between the satellite and the reference point.
  • Some aspects described herein relate to a non-transitory computer-readable medium that stores a set of instructions for wireless communication by a UE.
  • the set of instructions when executed by one or more processors of the UE, may cause the UE to receive, from a network node, signaling indicating one or more common timing offset parameters that are based at least in part on one or more delays between a satellite and a reference point in an NTN.
  • the set of instructions when executed by one or more processors of the UE, may cause the UE to determine a transmit time for an uplink signal based at least in part on the one or more common timing offset parameters and a starting time associated with an uplink slot in which the uplink signal is to arrive at the reference point.
  • the set of instructions when executed by one or more processors of the UE, may cause the UE to transmit the uplink signal at the transmit time.
  • Some aspects described herein relate to a non-transitory computer-readable medium that stores a set of instructions for wireless communication by a network node.
  • the set of instructions when executed by one or more processors of the network node, may cause the network node to determine one or more delays between a satellite and a reference point in an NTN.
  • the set of instructions when executed by one or more processors of the network node, may cause the network node to transmit, to a UE, signaling indicating one or more common timing offset parameters that are based at least in part on the one or more delays between the satellite and the reference point.
  • the apparatus may include means for receiving, from a network node, signaling indicating one or more common timing offset parameters that are based at least in part on one or more delays between a satellite and a reference point in an NTN.
  • the apparatus may include means for determining a transmit time for an uplink signal based at least in part on the one or more common timing offset parameters and a starting time associated with an uplink slot in which the uplink signal is to arrive at the reference point.
  • the apparatus may include means for transmitting the uplink signal at the transmit time.
  • the apparatus may include means for determining one or more delays between a satellite and a reference point in an NTN.
  • the apparatus may include means for transmitting, to a UE, signaling indicating one or more common timing offset parameters that are based at least in part on the one or more delays between the satellite and the reference point.
  • the apparatus may include: a memory comprising instructions; and one or more processors.
  • the one or more processors may be configured to execute the instructions and cause the apparatus to obtain, from a network node, signaling indicating one or more common timing offset parameters that are based at least in part on one or more delays between a satellite and a reference point in an NTN.
  • the one or more processors may be configured to execute the instructions and cause the apparatus to determine a transmit time for an uplink signal based at least in part on the one or more common timing offset parameters and a starting time associated with an uplink slot in which the uplink signal is to arrive at the reference point.
  • the one or more processors may be configured to execute the instructions and cause the apparatus to output the uplink signal for transmission at the transmit time.
  • the apparatus may include: a memory comprising instructions; and one or more processors.
  • the one or more processors may be configured to execute the instructions and cause the apparatus to determine one or more delays between a satellite and a reference point in an NTN.
  • the one or more processors may be configured to execute the instructions and cause the apparatus to output, for transmission to a UE, signaling indicating one or more common timing offset parameters that are based at least in part on the one or more delays between the satellite and the reference point.
  • the method may include obtaining, from a network node, signaling indicating one or more common timing offset parameters that are based at least in part on one or more delays between a satellite and a reference point in an NTN.
  • the method may include determining a transmit time for an uplink signal based at least in part on the one or more common timing offset parameters and a starting time associated with an uplink slot in which the uplink signal is to arrive at the reference point.
  • the method may include outputting the uplink signal for transmission at the transmit time.
  • the method may include determining one or more delays between a satellite and a reference point in an NTN.
  • the method may include outputting, for transmission to a UE, signaling indicating one or more common timing offset parameters that are based at least in part on the one or more delays between the satellite and the reference point.
  • Some aspects described herein relate to a non-transitory computer-readable medium that stores a set of instructions for wireless communication by an apparatus.
  • the set of instructions when executed by one or more processors of the apparatus, may cause the apparatus to obtain, from a network node, signaling indicating one or more common timing offset parameters that are based at least in part on one or more delays between a satellite and a reference point in an NTN.
  • the set of instructions when executed by one or more processors of the apparatus, may cause the apparatus to determine a transmit time for an uplink signal based at least in part on the one or more common timing offset parameters and a starting time associated with an uplink slot in which the uplink signal is to arrive at the reference point.
  • the set of instructions when executed by one or more processors of the apparatus, may cause the apparatus to output the uplink signal for transmission at the transmit time.
  • Some aspects described herein relate to a non-transitory computer-readable medium that stores a set of instructions for wireless communication by an apparatus.
  • the set of instructions when executed by one or more processors of the apparatus, may cause the apparatus to determine one or more delays between a satellite and a reference point in an NTN.
  • the set of instructions when executed by one or more processors of the apparatus, may cause the apparatus to output, for transmission to a UE, signaling indicating one or more common timing offset parameters that are based at least in part on the one or more delays between the satellite and the reference point.
  • the apparatus may include means for obtaining, from a network node, signaling indicating one or more common timing offset parameters that are based at least in part on one or more delays between a satellite and a reference point in an NTN.
  • the apparatus may include means for determining a transmit time for an uplink signal based at least in part on the one or more common timing offset parameters and a starting time associated with an uplink slot in which the uplink signal is to arrive at the reference point.
  • the apparatus may include means for outputting the uplink signal for transmission at the transmit time.
  • the apparatus may include means for determining one or more delays between a satellite and a reference point in an NTN.
  • the apparatus may include means for outputting, for transmission to a UE, signaling indicating one or more common timing offset parameters that are based at least in part on the one or more delays between the satellite and the reference point.
  • aspects generally include a method, apparatus, system, computer program product, non-transitory computer-readable medium, user equipment, base station, satellite, reference point, network node, wireless communication device, and/or processing system as substantially described herein with reference to and as illustrated by the drawings and specification.
  • aspects are described in the present disclosure by illustration to some examples, those skilled in the art will understand that such aspects may be implemented in many different arrangements and scenarios.
  • Techniques described herein may be implemented using different platform types, devices, systems, shapes, sizes, and/or packaging arrangements.
  • some aspects may be implemented via integrated chip embodiments or other non-modulecomponent based devices (e.g., end-user devices, vehicles, communication devices, computing devices, industrial equipment, retail/purchasing devices, medical devices, and/or artificial intelligence devices).
  • Aspects may be implemented in chip-level components, modular components, non-modular components, non-chip-level components, device-level components, and/or system-level components.
  • Devices incorporating described aspects and features may include additional components and features for implementation and practice of claimed and described aspects.
  • transmission and reception of wireless signals may include one or more components for analog and digital purposes (e.g., hardware components including antennas, radio frequency chains, power amplifiers, modulators, buffers, processors, interleavers, adders, and/or summers). It is intended that aspects described herein may be practiced in a wide variety of devices, components, systems, distributed arrangements, and/or end-user devices of varying size, shape, and constitution.
  • components for analog and digital purposes e.g., hardware components including antennas, radio frequency chains, power amplifiers, modulators, buffers, processors, interleavers, adders, and/or summers.
  • Fig. 1 is a diagram illustrating an example of a wireless network, in accordance with the present disclosure.
  • Fig. 2 is a diagram illustrating an example of a base station in communication with a user equipment (UE) in a wireless network, in accordance with the present disclosure.
  • UE user equipment
  • Fig. 3 is a diagram illustrating an example of a regenerative satellite deployment and an example of a transparent satellite deployment in a non-terrestrial network (NTN).
  • NTN non-terrestrial network
  • Fig. 4 is a diagram illustrating an example associated with signaling ephemeris information in an NTN, in accordance with the present disclosure.
  • Figs. 5A-5D are diagrams illustrating examples associated with common timing offset signaling and UE transmit time calculation in an NTN, in accordance with the present disclosure.
  • Fig. 6 is a diagram illustrating an example associated with a direct uplink transmit time calculation in an NTN, in accordance with the present disclosure.
  • FIGs. 7-8 are diagrams illustrating example processes associated with common timing offset signaling in an NTN, in accordance with the present disclosure.
  • FIGs. 9-10 are diagrams of example apparatuses for wireless communication, in accordance with the present disclosure.
  • Fig. 1 is a diagram illustrating an example of a wireless network 100, in accordance with the present disclosure.
  • the wireless network 100 may be or may include elements of a 5G (e.g., NR) network and/or a 4G (e g., Long Term Evolution (LTE)) network, among other examples.
  • 5G e.g., NR
  • 4G e g., Long Term Evolution (LTE) network
  • the wireless network 100 may include one or more base stations 110 (shown as a BS 110a, a BS 110b, a BS 110c, and a BS 1 lOd), a user equipment (UE) 120 or multiple UEs 120 (shown as a UE 120a, a UE 120b, a UE 120c, a UE 120d, and a UE 120e), and/or other network entities.
  • a base station 110 is an entity that communicates with UEs 120.
  • a base station 110 may include, for example, an NR base station, an LTE base station, a Node B, an eNB (e.g., in 4G), a gNB (e.g., in 5G), an access point, and/or a transmission reception point (TRP).
  • Each base station 110 may provide communication coverage for a particular geographic area.
  • the term “cell” can refer to a coverage area of a base station 110 and/or a base station subsystem serving this coverage area, depending on the context in which the term is used.
  • a base station 110 may provide communication coverage for a macro cell, a pico cell, a femto cell, and/or another type of cell.
  • a macro cell may cover a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by UEs 120 with service subscriptions.
  • a pico cell may cover a relatively small geographic area and may allow unrestricted access by UEs 120 with service subscription.
  • a femto cell may cover a relatively small geographic area (e.g., a home) and may allow restricted access by UEs 120 having association with the femto cell (e.g., UEs 120 in a closed subscriber group (CSG)).
  • CSG closed subscriber group
  • a base station 110 for a macro cell may be referred to as a macro base station.
  • a base station 110 for a pico cell may be referred to as a pico base station.
  • a base station 110 for a femto cell may be referred to as a femto base station or an in-home base station.
  • the BS 110a may be a macro base station for a macro cell 102a
  • the BS 110b may be a pico base station for a pico cell 102b
  • the BS 110c may be a femto base station for a femto cell 102c.
  • a base station may support one or multiple (e.g., three) cells.
  • a cell may not necessarily be stationary, and the geographic area of the cell may move according to the location of a base station 110 that is mobile (e.g., a mobile base station).
  • the base stations 110 may be interconnected to one another and/or to one or more other base stations 110 or network nodes (not shown) in the wireless network 100 through various types of backhaul interfaces, such as a direct physical connection or a virtual network, using any suitable transport network.
  • the wireless network 100 may include one or more relay stations.
  • a relay station is an entity that can receive a transmission of data from an upstream station (e.g., a base station 110 or a UE 120) and send a transmission of the data to a downstream station (e.g., a UE 120 or a base station 110).
  • a relay station may be a UE 120 that can relay transmissions for other UEs 120.
  • the BS 1 lOd e.g., a relay base station
  • the BS 110a e.g., a macro base station
  • the UE 120d in order to facilitate communication between the BS 110a and the UE 120d.
  • a base station 110 that relays communications may be referred to as a relay station, a relay base station, a relay, or the like.
  • the wireless network 100 may be a heterogeneous network that includes base stations 110 of different types, such as macro base stations, pico base stations, femto base stations, relay base stations, or the like. These different types of base stations 110 may have different transmit power levels, different coverage areas, and/or different impacts on interference in the wireless network 100. For example, macro base stations may have a high transmit power level (e.g., 5 to 40 watts) whereas pico base stations, femto base stations, and relay base stations may have lower transmit power levels (e.g., 0.1 to 2 watts).
  • a network controller 130 may couple to or communicate with a set of base stations 110 and may provide coordination and control for these base stations 110.
  • the network controller 130 may communicate with the base stations 110 via a backhaul communication link.
  • the base stations 110 may communicate with one another directly or indirectly via a wireless or wireline backhaul communication link.
  • the UEs 120 may be dispersed throughout the wireless network 100, and each UE 120 may be stationary or mobile.
  • a UE 120 may include, for example, an access terminal, a terminal, a mobile station, and/or a subscriber unit.
  • a UE 120 may be a cellular phone (e g., a smart phone), a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) station, a tablet, a camera, a gaming device, a netbook, a smartbook, an ultrabook, a medical device, a biometric device, a wearable device (e g., a smart watch, smart clothing, smart glasses, a smart wristband, smart jewelry (e.g., a smart ring or a smart bracelet)), an entertainment device (e.g., a music device, a video device, and/or a satellite radio), a vehicular component or sensor,
  • Some UEs 120 may be considered machine-type communication (MTC) or evolved or enhanced machine-type communication (eMTC) UEs.
  • An MTC UE and/or an eMTC UE may include, for example, a robot, a drone, a remote device, a sensor, a meter, a monitor, and/or a location tag, that may communicate with a base station, another device (e.g., a remote device), or some other entity.
  • Some UEs 120 may be considered Intemet-of-Things (loT) devices, and/or may be implemented as NB-IoT (narrowband loT) devices.
  • Some UEs 120 may be considered a Customer Premises Equipment.
  • a UE 120 may be included inside a housing that houses components of the UE 120, such as processor components and/or memory components.
  • the processor components and the memory components may be coupled together.
  • the processor components e.g., one or more processors
  • the memory components e.g., a memory
  • the processor components and the memory components may be operatively coupled, communicatively coupled, electronically coupled, and/or electrically coupled.
  • any number of wireless networks 100 may be deployed in a given geographic area.
  • Each wireless network 100 may support a particular RAT and may operate on one or more frequencies.
  • a RAT may be referred to as a radio technology, an air interface, or the like.
  • a frequency may be referred to as a carrier, a frequency channel, or the like.
  • Each frequency may support a single RAT in a given geographic area in order to avoid interference between wireless networks of different RATs.
  • NR or 5G RAT networks may be deployed.
  • two or more UEs 120 may communicate directly using one or more sidelink channels (e.g., without using a base station 110 as an intermediary to communicate with one another).
  • the UEs 120 may communicate using peer-to-peer (P2P) communications, device-to-device (D2D) communications, a vehicle-to-everything (V2X) protocol (e.g., which may include a vehicle-to- vehicle (V2V) protocol, a vehicle-to-infrastructure (V2I) protocol, or a vehicle-to-pedestnan (V2P) protocol), and/or a mesh network.
  • V2X vehicle-to-everything
  • a UE 120 may perform scheduling operations, resource selection operations, and/or other operations described elsewhere herein as being performed by the base station 110.
  • Devices of the wireless network 100 may communicate using the electromagnetic spectrum, which may be subdivided by frequency or wavelength into various classes, bands, channels, or the like. For example, devices of the wireless network 100 may communicate using one or more operating bands.
  • 5G NR two initial operating bands have been identified as frequency range designations FR1 (410 MHz - 7.125 GHz) and FR2 (24.25 GHz - 52.6 GHz). It should be understood that although a portion of FR1 is greater than 6 GHz, FR1 is often referred to (interchangeably) as a “Sub-6 GHz” band in various documents and articles.
  • FR2 which is often referred to (interchangeably) as a “millimeter wave” band in documents and articles, despite being different from the extremely high frequency (EHF) band (30 GHz - 300 GHz) which is identified by the International Telecommunications Union (ITU) as a “millimeter wave” band.
  • EHF extremely high frequency
  • ITU International Telecommunications Union
  • FR3 7.125 GHz - 24.25 GHz
  • Frequency bands falling within FR3 may inherit FR1 characteristics and/or FR2 characteristics, and thus may effectively extend features of FR1 and/or FR2 into mid-band frequencies.
  • higher frequency bands are currently being explored to extend 5G NR operation beyond 52.6 GHz.
  • three higher operating bands have been identified as frequency range designations FR4a or FR4-1 (52.6 GHz - 71 GHz), FR4 (52.6 GHz - 114.25 GHz), and FR5 (114.25 GHz - 300 GHz). Each of these higher frequency bands falls within the EHF band.
  • sub-6 GHz may broadly represent frequencies that may be less than 6 GHz, may be within FR1, or may include mid-band frequencies.
  • millimeter wave may broadly represent frequencies that may include mid-band frequencies, may be within FR2, FR4, FR4-a or FR4-1, and/or FR5, or may be within the EHF band.
  • frequencies included in these operating bands may be modified, and techniques described herein are applicable to those modified frequency ranges.
  • the wireless network 100 may include one or more non-terrestrial network (NTN) deployments in which a non-terrestrial wireless communication device may include a base station (referred to herein, interchangeably, as a “non-terrestrial base station”) and/or a relay station (referred to herein, interchangeably, as a “non-terrestrial relay station”).
  • NTN may refer to a network for which access is facilitated by a nonterrestrial base station and/or a non-terrestrial relay station.
  • the wireless network 100 may include any number of non-terrestrial wireless communication devices.
  • a non-terrestrial wireless communication device may include a satellite and/or a high-altitude platform (HAP).
  • HAP high-altitude platform
  • a HAP may include a balloon, a dirigible, an airplane, and/or an unmanned aerial vehicle.
  • a non-terrestrial wireless communication device may be part of an NTN that is separate from the wireless network 100.
  • an NTN may be part of the wireless network 100.
  • Satellites may communicate directly and/or indirectly with other entities in wireless network 100 using satellite communication.
  • the other entities may include UEs, other satellites in the one or more NTN deployments, other types of base stations (e g., stationary or ground-based base stations), relay stations, and/or one or more components and/or devices included in a core network of wireless network 100.
  • a network node a network entity, a mobility element of a network, a RAN node, a core network node, a network element, or a network equipment, such as a base station (BS, e.g., base station 110), or one or more units (or one or more components) performing base station functionality, may be implemented in an aggregated or disaggregated architecture.
  • BS base station
  • one or more units (or one or more components) performing base station functionality may be implemented in an aggregated or disaggregated architecture.
  • a BS such as a Node B (NB), eNB, NR BS, 5G NB, access point (AP), a TRP, a cell, or the like
  • NB Node B
  • eNB evolved Node B
  • NR BS NR BS
  • 5G NB access point
  • TRP TRP
  • cell a cell, or the like
  • an aggregated base station also known as a standalone BS or a monolithic BS
  • disaggregated base station also known as a standalone BS or a monolithic BS
  • An aggregated base station may be configured to utilize a radio protocol stack that is physically or logically integrated within a single RAN node.
  • a disaggregated base station may be configured to utilize a protocol stack that is physically or logically distributed among two or more units (such as one or more central or centralized units (CUs), one or more distributed units (DUs), or one or more radio units (RUs)).
  • CUs central or centralized units
  • DUs distributed units
  • RUs radio units
  • a CU may be implemented within a RAN node, and one or more DUs may be co-located with the CU, or alternatively, may be geographically or virtually distributed throughout one or multiple other RAN nodes.
  • the DUs may be implemented to communicate with one or more RUs.
  • Each of the CU, DU and RU also can be implemented as virtual units, i.e., a virtual centralized unit (V CU), a virtual distributed unit (VDU), or a virtual radio unit (VRU).
  • Base station-type operation or network design may consider aggregation characteristics of base station functionality.
  • disaggregated base stations may be utilized in an integrated access backhaul (IAB) network, an 0-RAN (such as the network configuration sponsored by the 0-RAN Alliance), or a virtualized radio access network (vRAN), also known as a cloud radio access network (C-RAN)).
  • IAB integrated access backhaul
  • 0-RAN such as the network configuration sponsored by the 0-RAN Alliance
  • vRAN virtualized radio access network
  • C-RAN cloud radio access network
  • Disaggregation may include distributing functionality across two or more units at various physical locations, as well as distributing functionality for at least one unit virtually, which can enable flexibility in network design.
  • the various units of the disaggregated base station, or disaggregated RAN architecture can be configured for wired or wireless communication with at least one other unit.
  • the term “base station” (e g., the base station 110) or “network node” may refer to an aggregated base station, a disaggregated base station, an IAB node, a relay node, and/or one or more components thereof.
  • the term “base station” or “network node” may refer to a CU, a DU, an RU, a Near-Real Time (Near-RT) RAN Intelligent Controller (RIC), or a Non-Real Time (Non-RT) RIC, or a combination thereof.
  • the term “base station” or “network node” may refer to one device configured to perform one or more functions, such as those described herein in connection with the base station 110.
  • the term “base station” or “network node” may refer to multiple devices configured to perform the one or more functions. For example, in some distributed systems, each of a number of different devices (which may be located in the same geographic location or in different geographic locations) may be configured to perform at least a portion of a function, or to duplicate performance of at least a portion of the function, and the term “base station” or “network node” may refer to any one or more of those different devices.
  • the term “base station” or “network node” may refer to one or more virtual base stations and/or one or more virtual base station functions. For example, in some aspects, two or more base station functions may be instantiated on a single device. In some aspects, the term “base station” or “network node” may refer to one of the base station functions and not another. In this way, a single device may include more than one base station. [0055] In some aspects, the UE 120 may include a communication manager 140.
  • the communication manager 140 may obtain, from a network node (e.g., base station 110), signaling indicating one or more common timing offset parameters that are based at least in part on one or more delays between a satellite and a reference point in an NTN; determine a transmit time for an uplink signal based at least in part on the one or more common timing offset parameters and a starting time associated with an uplink slot in which the uplink signal is to arrive at the reference point; and output the uplink signal for transmission at the transmit time. Additionally, or alternatively, the communication manager 140 may perform one or more other operations described herein.
  • a network node e.g., base station 110
  • signaling indicating one or more common timing offset parameters that are based at least in part on one or more delays between a satellite and a reference point in an NTN
  • determine a transmit time for an uplink signal based at least in part on the one or more common timing offset parameters and a starting time associated with an uplink slot in which the uplink signal is to arrive at the reference point
  • the base station 110 may include a communication manager 150.
  • the communication manager 150 may determine one or more delays between a satellite and a reference point in an NTN; and output, for transmission to a UE 120, signaling indicating one or more common timing offset parameters that are based at least in part on the one or more delays between the satellite and the reference point. Additionally, or alternatively, the communication manager 150 may perform one or more other operations described herein.
  • Fig. 1 is provided as an example. Other examples may differ from what is described with regard to Fig. 1.
  • Fig. 2 is a diagram illustrating an example 200 of a base station 110 in communication with a UE 120 in a wireless network 100, in accordance with the present disclosure.
  • the base station 110 may be equipped with a set of antennas 234a through 234t, such as T antennas (T> 1).
  • the UE 120 may be equipped with a set of antennas 252a through 252r, such as R antennas (R > 1).
  • a transmit processor 220 may receive data, from a data source 212, intended for the UE 120 (or a set of UEs 120).
  • the transmit processor 220 may select one or more modulation and coding schemes (MCSs) for the UE 120 based at least in part on one or more channel quality indicators (CQIs) received from that UE 120.
  • MCSs modulation and coding schemes
  • CQIs channel quality indicators
  • the base station 110 may process (e.g., encode and modulate) the data for the UE 120 based at least in part on the MCS(s) selected for the UE 120 and may provide data symbols for the UE 120.
  • the transmit processor 220 may process system information (e.g., for semi-static resource partitioning information (SRPI)) and control information (e.g., CQI requests, grants, and/or upper layer signaling) and provide overhead symbols and control symbols.
  • the transmit processor 220 may generate reference symbols for reference signals (e.g., a cell-specific reference signal (CRS) or a demodulation reference signal (DMRS)) and synchronization signals (e.g., a primary synchronization signal (PSS) or a secondary synchronization signal (SSS)).
  • reference signals e.g., a cell-specific reference signal (CRS) or a demodulation reference signal (DMRS)
  • synchronization signals e.g., a primary synchronization signal (PSS) or a secondary synchronization signal (SSS)
  • a transmit (TX) multiple -input multiple -output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on the data symbols, the control symbols, the overhead symbols, and/or the reference symbols, if applicable, and may provide a set of output symbol streams (e.g., T output symbol streams) to a corresponding set of modems 232 (e.g., T modems), shown as modems 232a through 232t.
  • each output symbol stream may be provided to a modulator component (shown as MOD) of a modem 232.
  • Each modem 232 may use a respective modulator component to process a respective output symbol stream (e.g., for OFDM) to obtain an output sample stream.
  • Each modem 232 may further use a respective modulator component to process (e.g., convert to analog, amplify, fdter, and/or upconvert) the output sample stream to obtain a downlink signal.
  • the modems 232a through 232t may transmit a set of downlink signals (e.g., T downlink signals) via a corresponding set of antennas 234 (e.g., T antennas), shown as antennas 234a through 234t.
  • a set of antennas 252 may receive the downlink signals from the base station 110 and/or other base stations 110 and may provide a set of received signals (e.g., R received signals) to a set of modems 254 (e.g., R modems), shown as modems 254a through 254r.
  • R received signals e.g., R received signals
  • each received signal may be provided to a demodulator component (shown as DEMOD) of a modem 254.
  • DEMOD demodulator component
  • Each modem 254 may use a respective demodulator component to condition (e.g., filter, amplify, downconvert, and/or digitize) a received signal to obtain input samples.
  • Each modem 254 may use a demodulator component to further process the input samples (e.g., for OFDM) to obtain received symbols.
  • a MIMO detector 256 may obtain received symbols from the modems 254, may perform MIMO detection on the received symbols if applicable, and may provide detected symbols.
  • a receive processor 258 may process (e.g., demodulate and decode) the detected symbols, may provide decoded data for the UE 120 to a data sink 260, and may provide decoded control information and system information to a controller/processor 280.
  • controller/processor may refer to one or more controllers, one or more processors, or a combination thereof.
  • a channel processor may determine a reference signal received power (RSRP) parameter, a received signal strength indicator (RSSI) parameter, a reference signal received quality (RSRQ) parameter, and/or a CQI parameter, among other examples.
  • RSRP reference signal received power
  • RSSI received signal strength indicator
  • RSSRQ reference signal received quality
  • CQI CQI parameter
  • the network controller 130 may include a communication unit 294, a controller/processor 290, and a memory 292.
  • the network controller 130 may include, for example, one or more devices in a core network.
  • the network controller 130 may communicate with the base station 110 via the communication unit 294.
  • One or more antennas may include, or may be included within, one or more antenna panels, one or more antenna groups, one or more sets of antenna elements, and/or one or more antenna arrays, among other examples.
  • An antenna panel, an antenna group, a set of antenna elements, and/or an antenna array may include one or more antenna elements (within a single housing or multiple housings), a set of coplanar antenna elements, a set of non-coplanar antenna elements, and/or one or more antenna elements coupled to one or more transmission and/or reception components, such as one or more components of Fig. 2.
  • a transmit processor 264 may receive and process data from a data source 262 and control information (e.g., for reports that include RSRP, RSSI, RSRQ, and/or CQI) from the controller/processor 280.
  • the transmit processor 264 may generate reference symbols for one or more reference signals.
  • the symbols from the transmit processor 264 may be precoded by a TX MIMO processor 266 if applicable, further processed by the modems 254 (e.g., for DFT-s-OFDM or CP-OFDM), and transmitted to the base station 110.
  • the modem 254 of the UE 120 may include a modulator and a demodulator.
  • the UE 120 includes a transceiver.
  • the transceiver may include any combination of the antenna(s) 252, the modem(s) 254, the MIMO detector 256, the receive processor 258, the transmit processor 264, and/or the TX MIMO processor 266.
  • the transceiver may be used by a processor (e.g., the controller/processor 280) and the memory 282 to perform aspects of any of the methods described herein (e.g., with reference to Figs. 4-10).
  • the uplink signals from UE 120 and/or other UEs may be received by the antennas 234, processed by the modem 232 (e.g., a demodulator component, shown as DEMOD, of the modem 232), detected by a MIMO detector 236 if applicable, and further processed by a receive processor 238 to obtain decoded data and control information sent by the UE 120.
  • the receive processor 238 may provide the decoded data to a data sink 239 and provide the decoded control information to the controller/processor 240.
  • the base station 110 may include a communication unit 244 and may communicate with the network controller 130 via the communication unit 244.
  • the base station 110 may include a scheduler 246 to schedule one or more UEs 120 for downlink and/or uplink communications.
  • the modem 232 of the base station 110 may include a modulator and a demodulator.
  • the base station 110 includes a transceiver.
  • the transceiver may include any combination of the antenna(s) 234, the modem(s) 232, the MIMO detector 236, the receive processor 238, the transmit processor 220, and/or the TX MIMO processor 230.
  • the transceiver may be used by a processor (e.g., the controller/processor 240) and the memory 242 to perform aspects of any of the methods described herein (e.g., with reference to Figs. 4-10).
  • the controller/processor 240 of the base station 110, the controller/processor 280 of the UE 120, and/or any other component(s) of Fig. 2 may perform one or more techniques associated with common timing offset signaling in an NTN, as described in more detail elsewhere herein.
  • the controller/processor 240 of the base station 110, the controller/processor 280 of the UE 120, and/or any other component(s) of Fig. 2 may perform or direct operations of, for example, process 700 of Fig. 7, process 800 of Fig. 8, and/or other processes as described herein.
  • the memory 242 and the memory 282 may store data and program codes for the base station 110 and the UE 120, respectively.
  • the memory 242 and/or the memory 282 may include a non-transitory computer-readable medium storing one or more instructions (e.g., code and/or program code) for wireless communication.
  • the one or more instructions when executed (e.g., directly, or after compiling, converting, and/or interpreting) by one or more processors of the base station 110 and/or the UE 120, may cause the one or more processors, the UE 120, and/or the base station 110 to perform or direct operations of, for example, process 700 of Fig. 7, process 800 of Fig. 8, and/or other processes as described herein.
  • executing instructions may include running the instructions, converting the instructions, compiling the instructions, and/or interpreting the instructions, among other examples.
  • the UE 120 includes means for obtaining, from a network node (e.g., the base station 110), signaling indicating one or more common timing offset parameters that are based at least in part on one or more delays between a satellite and a reference point in an NTN; means for determining a transmit time for an uplink signal based at least in part on the one or more common timing offset parameters and a starting time associated with an uplink slot in which the uplink signal is to arrive at the reference point; and/or means for outputting the uplink signal for transmission at the transmit time.
  • a network node e.g., the base station 110
  • signaling indicating one or more common timing offset parameters that are based at least in part on one or more delays between a satellite and a reference point in an NTN
  • means for determining a transmit time for an uplink signal based at least in part on the one or more common timing offset parameters and a starting time associated with an uplink slot in which the uplink signal is to arrive at the reference point
  • the means for the UE 120 to perform operations described herein may include, for example, one or more of communication manager 140, antenna 252, modem 254, MIMO detector 256, receive processor 258, transmit processor 264, TX MIMO processor 266, controller/processor 280, or memory 282.
  • a network node (e.g., the base station 110) includes means for determining one or more delays between a satellite and a reference point in an NTN; and/or means for outputting, for transmission to a UE 120, signaling indicating one or more common timing offset parameters that are based at least in part on the one or more delays between the satellite and the reference point.
  • the means for the network node to perform operations described herein may include, for example, one or more of communication manager 150, transmit processor 220, TX MIMO processor 230, modem 232, antenna 234, MIMO detector 236, receive processor 238, controller/processor 240, memory 242, or scheduler 246.
  • Fig. 2 While blocks in Fig. 2 are illustrated as distinct components, the functions described above with respect to the blocks may be implemented in a single hardware, software, or combination component or in various combinations of components.
  • the functions described with respect to the transmit processor 264, the receive processor 258, and/or the TX MIMO processor 266 may be performed by or under the control of the controller/processor 280.
  • Fig. 2 is provided as an example. Other examples may differ from what is described with regard to Fig. 2.
  • FIG. 3 is a diagram illustrating an example 300 of a regenerative satellite deployment and an example 310 of a transparent satellite deployment in an NTN.
  • Example 300 shows a regenerative satellite deployment in an NTN.
  • a UE 120 is served by a satellite 320 via a service link 330.
  • the satellite 320 may include a base station 110 (e.g., base station 110a) and/or a gNB.
  • the satellite 320 may be referred to as a non-terrestrial base station, a regenerative repeater, and/or an on-board processing repeater, among other examples.
  • the satellite 320 may demodulate an uplink radio frequency (RF) signal and may modulate a baseband signal derived from the uplink RF signal to produce a downlink RF transmission.
  • the satellite 320 may transmit the downlink RF signal to the UE 120 on the service link 330.
  • RF radio frequency
  • the satellite 320 may provide a cell that covers the UE 120 [0072]
  • Example 310 shows a transparent satellite deployment, which may also be referred to as a bent-pipe satellite deployment.
  • a UE 120 is served by a satellite 340 via the service link 330.
  • the satellite 340 may be a transparent satellite.
  • the satellite 340 may relay a signal received from a gateway 350 (e.g., a reference point) via a feeder link 360.
  • the satellite 340 may receive an RF transmission from the gateway 350 via the feeder link 360 and may relay the RF transmission to the UE 120 via the service link 330 without demodulating the RF transmission.
  • the satellite 340 may receive an RF transmission from the UE 120 via the service link 330 and may relay the RF transmission to the gateway 350 via the feeder link 360 without demodulating the RF transmission.
  • the satellite 340 may frequency convert the RF transmission(s) received on the service link 330 to a frequency of the RF transmission(s) on the feeder link 360 (or vice versa) and may amplify and/or fdter the relayed RF transmission(s).
  • the UEs 120 shown in example 300 and example 310 may be associated with a Global Navigation Satellite System (GNSS) capability or a Global Positioning System (GPS) capability, though not all UEs have such capabilities.
  • GNSS Global Navigation Satellite System
  • GPS Global Positioning System
  • the satellite 340 may provide a cell that covers the UE 120.
  • the service link 330 may include a link between the satellite 320/340 and the UE 120, and may include one or more of an uplink or a downlink.
  • the feeder link 360 may include a link between the satellite 340 and the gateway 350, and may include one or more of an uplink (e.g., from the UE 120 to the gateway 350 via the satellite 340) or a downlink (e.g, from the gateway 350 to the UE 120 via the satellite 340).
  • an uplink of the service link 330 is indicated by reference number 330-U and a downlink of the service link 330 is indicated by reference number 330-D.
  • an uplink of the feeder link 360 is indicated by reference number 360-U and a downlink of the feeder link 360 is indicated by reference number 360-D.
  • the feeder link 360 and the service link 330 may each experience Doppler effects due to the movement of the satellites 320 and 340, and potentially movement of a UE 120.
  • the Doppler effects may be significantly larger than in a terrestrial network.
  • the Doppler effect on the feeder link 360 may be compensated for to some degree, but may still be associated with some amount of uncompensated frequency error.
  • the gateway 350 may be associated with a residual frequency error, and/or the satellite 320/340 may be associated with an on-board frequency error. These sources of frequency error may cause a received downlink frequency at the UE 120 to drift from a target downlink frequency.
  • communication in an NTN may be associated with a much longer delay (e.g., a longer latency and/or a longer round-trip time (RTT)) than a delay associated with a terrestrial network.
  • the delay may be even greater in a transparent satellite deployment because any communication between the UE 120 and the gateway 350 must travel over the service link 330 and the feeder link 360, each of which may associated with a longer delay than a terrestrial network.
  • a UE may generally apply a timing advance (TA) to an uplink transmission performed in a radio resource control (RRC) idle or inactive state and/or an uplink transmission performed in an RRC connected state. Applying the TA to the uplink transmission can include transmitting the uplink transmission at an earlier time (e.g., at a transmit time that is advanced by a value of the TA).
  • RRC radio resource control
  • the TA applied by the UE may have a value that corresponds to a length of time that a signal takes to travel from a reference point to the UE and back to the reference point, where the reference point may be included in a satellite in a regenerative satellite deployment or included in a gateway or a base station in a transparent satellite deployment.
  • the reference point in an NTN may generally correspond to a physical entity in the NTN where downlink and uplink slots are synchronized, and a slot duration is constant overtime.
  • the TA applied by the UE may therefore correspond to a round-trip time (RTT) between the reference point and the UE because the TA is relative to a downlink slot at the UE, which is already a single-trip delay relative to the same downlink slot at the reference point.
  • RTT round-trip time
  • the TA applied by the UE may align uplink reception timing at the reference point to enable communication with different UEs that may be located at various distances from the reference point.
  • T TA may be given by: [0076]
  • N TA is a closed-loop timing offset between uplink and downlink radio frames at the UE.
  • the closed-loop timing offset may be defined as zero (0) for a physical random access channel (PRACH) transmission that occurs before the UE has established an RRC connection, and the closed-loop timing offset value may then be updated based at least in part on a TA command field in msg2 in a four-step random access procedure, a TA command field in msgB in a two-step random access procedure, and/or a medium access control (MAC) control element (MAC-CE) TA command, among other examples.
  • PRACH physical random access channel
  • MAC-CE medium access control element
  • the parameter N TA UE-speci f ic represents an open-loop UE-specific TA that is self-estimated by the UE to precompensate for a service link delay
  • the parameter N TA common is a network-controlled common TA (e.g., a TA that is common to all UEs in the NTN or all UEs served by a satellite) that includes any timing offsets that may be considered necessary by the NTN
  • the parameter N TA orrset is a fixed timing advance offset that the UE uses to calculate the TA applied to an uplink transmission
  • T c is a timing unit defined as 1/(480,000x4096) seconds, or 0.509 nanoseconds.
  • the network-controlled common timing offset, N TAiCommon may cause significant timing errors when the common timing offset is set to be the feeder link delay based on an incorrect assumption that the feeder link delay is the same for all UEs.
  • the network-controlled common timing offset may be set to zero (0) because there is no feeder link delay to incorporate into the total TA applied by a UE.
  • an NTN may be configured such that the reference point is at the base station or another terrestrial or non-terrestrial node in a communication path between the satellite and the base station (e.g., a physical entity or physical node that relays communications between the base station and the satellite via a backhaul, a midhaul, or a fronthaul, such as an RU or a DU of a disaggregated base station).
  • a physical entity or physical node that relays communications between the base station and the satellite via a backhaul, a midhaul, or a fronthaul, such as an RU or a DU of a disaggregated base station.
  • the network-controlled common timing offset may have a non-zero value that changes over time (e.g., based on the feeder link delay that exists at a given time, which may vary over time due to movement of the satellite orbiting the Earth and/or movement of the reference point caused by rotation of the Earth changing the distance between the satellite and the reference point).
  • the base station may periodically signal the common timing offset value, or the base station may signal the common timing offset value and/or one or more derivatives of the common timing offset value so that the UE can calculate the common timing offset value over an extended time period.
  • the net feeder link delay may involve one-way delays at different times.
  • the net feeder link delay for a given UE includes a one-way (downlink) delay from the reference point to the satellite at a first time and a one-way (uplink) delay from the satellite to the reference point at a second time, where the first time and the second time are separated by the service link delay for the given UE.
  • the satellite moves between the first time (e.g., a time when the satellite receives a downlink signal to be relayed from the reference point to the UE) and the second time (e.g., a time when the satellite receives an uplink signal to be relayed from the UE to the reference point)
  • the first time e.g., a time when the satellite receives a downlink signal to be relayed from the reference point to the UE
  • the second time e.g., a time when the satellite receives an uplink signal to be relayed from the UE to the reference point
  • Setting the network-controlled common timing offset to the feeder link delay can therefore result in significant timing errors, especially in an NTN where communication with satellites and/or other nodes at high altitudes involve large round-trip delays.
  • a base station in an NTN may transmit, to a UE, ephemeris information associated with a satellite, where the ephemeris information defines a trajectory (e.g., an astronomical position and/or velocity) of the satellite overtime.
  • a trajectory e.g., an astronomical position and/or velocity
  • the satellite ephemeris information may be associated with an epoch time or a reference time, which may be configured to be the starting time of a downlink slot at a reference point where downlink and uplink slots are synchronized, and a slot duration is constant over time.
  • a base station may signal one or more common delay or timing offset parameters to a UE, and the UE may use the common delay or timing offset parameter(s) and the ephemeris information to compute a UE-specific transmit time for transmitting an uplink signal in a particular slot.
  • the one or more common delay or timing offset parameters may include a one-way delay from the satellite to the reference point for the targeted uplink slot, half of a round-trip time between the reference point and the satellite, a one-way delay from the reference point to the satellite for a downlink slot aligned in time with the targeted uplink slot, and/or a geometric distance between the satellite and the reference point divided by the speed of light at the time of the targeted uplink slot, among other examples.
  • a UE that receives the one or more common delay or timing offset parameters may accurately compute a UE-specific transmit time for transmitting an uplink signal in a particular uplink slot based on the common delay or timing offset values, the ephemeris information, and the service link delay of the UE. Further details are provided below with reference to Fig. 4, Figs. 5A-5D, and Fig. 6. [0080] As indicated above, Fig. 3 is provided as an example. Other examples may differ from what is described with regard to Fig 3.
  • Fig. 4 is a diagram illustrating an example 400 associated with signaling ephemeris information in an NTN, in accordance with the present disclosure.
  • example 400 includes communication between a UE (e.g., UE 120) and abase station in an NTN.
  • the base station may control communication between the UE and one or more satellites (not shown) (e.g., in a regenerative or transparent deployment, as described in more detail above with reference to Fig. 3).
  • the base station and the UE may communicate in an NTN where a reference point is at a location other than the satellite (e.g., the reference point may be at the base station or another location in a path between the satellite and the base station, such as an RU, a DU, or any other physical entity or physical node that relays communications between the base station and the satellite).
  • a reference point is at a location other than the satellite (e.g., the reference point may be at the base station or another location in a path between the satellite and the base station, such as an RU, a DU, or any other physical entity or physical node that relays communications between the base station and the satellite).
  • the base station may transmit, and the UE may receive, ephemeris information associated with a satellite in an NTN.
  • ephemeris information may include various parameters that define orbital mechanics that can be used to describe or derive the location and orbital behavior of an astronomical body, such as a star or an Earth-orbiting object (e.g., the satellite in the NTN).
  • the ephemeris information signaled from the base station to the UE may be expressed in a two-line element (TLE) format, and may include a satellite number, one or more international designators (e.g., the last two digits of a launch year and/or a launch number of a year), an inclination in degrees, an eccentricity, a mean anomaly, a mean motion (e.g., revolutions per day), and/or one or more time derivatives of the mean motion, among other examples.
  • TLE two-line element
  • the ephemeris information may generally express mean orbital parameters, filtering out short-term perturbations, whereby the UE can then use the ephemeris information and a simplified general propagation model to calculate a location of the satellite revolving about the Earth in True Equator, Mean Equinox (TEME) coordinates.
  • the UE can then convert the location of the satellite into Earth-centered, Earth-fixed (ECEF) Cartesian x, y, z coordinates as a function of time (where the z-axis points to true North, and where the x-axis and y-axis intersect at zero (0) degrees latitude and zero (0) degrees longitude).
  • the UE can use the ephemeris information to obtain the instantaneous velocity of the satellite at the time that the satellite is in a particular ECEF location.
  • the UE may determine an epoch time (or reference time) associated with the satellite ephemeris information.
  • the epoch time may be defined to enable the UE to compute a common timing offset based on the location of the satellite at a time instant when an uplink signal transmitted by the UE is to arrive at the satellite or a reference point.
  • the reference point may be defined as the location in the NTN where downlink and uplink slots are synchronized (e.g., aligned in time with an offset given by N T A, O ffset ⁇ which may have a zero or non-zero value) and a slot duration is constant over time, where the reference point may be at the base station or another location between the satellite and the base station.
  • the epoch time or reference time for the ephemeris information may be defined as a starting time for a downlink slot at the reference point. For example, because the slot duration is uniform at the reference point, the slot duration is non-uniform at the satellite in cases where the reference point is at a location other than the satellite.
  • the epoch time may therefore be defined as the starting time for a downlink slot at the reference point so that the UE can accurately determine the location of the satellite at the starting time of an uplink slot, which may be necessary to compute the service link delay. Otherwise, if the epoch time were to be defined based on timing at the satellite, the UE may be unable to accurately determine the location of the satellite at the starting time of an uplink slot because slots are non-uniform at the satellite when the reference point is at a location other than the satellite.
  • defining the epoch time to be the starting time of a downlink slot at the reference point may enable the UE to define a reference timing for computing a UE-specific transmit time for transmitting an uplink signal in an uplink slot.
  • the base station may signal the ephemeris information to the UE in a particular downlink slot, Ko, which may then be used to define the starting time for a satellite ephemeris epoch.
  • the UE can easily propagate the location of the satellite over time because uplink and downlink slots are synchronized at the reference point and have a uniform duration at the reference point.
  • the UE may determine one or more common timing offsets at different times (e.g., uplink and/or downlink feeder link delays based on relative locations of the satellite and the reference point at the different times), which can be used to determine the UE-specific transmit time for transmitting an uplink signal in a particular uplink slot.
  • Fig. 4 is provided as an example. Other examples may differ from what is described with regard to Fig 4.
  • Figs. 5A-5D are diagrams illustrating examples 500 associated with common timing offset signaling and UE transmit time calculation in an NTN, in accordance with the present disclosure.
  • examples 500 include communication between a UE, a satellite, a reference point, and a base station.
  • the reference point may be provided at the base station, or the reference point may be provided at a location between the satellite and the base station (e.g., at a physical node or entity in a communication path between the satellite and the base station, such as an RU or a DU of a disaggregated base station).
  • the UE, the satellite, the reference point, and the base station may communicate in an NTN (e.g., in a regenerative or transparent deployment).
  • the base station may signal ephemeris information indicating the location of the satellite at the beginning of the downlink slot Ko at the reference point. Accordingly, an epoch time for the ephemeris information may be defined as to, which corresponds to the starting time of the downlink slot Ko at the reference point in which the ephemeris information is signaled.
  • the base station may signal one or more common delay or common timing offset parameters to the UE to enable the UE to compute a transmit time for transmitting an uplink signal in a particular uplink slot.
  • the base station may transmit, and the UE may receive, signaling that indicates one or more common delay or common timing offset parameters (e.g., delay or timing offset parameters that are common to all UEs in the NTN or all UEs served by the satellite) based on an uplink slot number (e.g., an uplink slot in which an uplink signal is to arrive at the reference point).
  • the base station may signal the one or more common delay or common timing offset parameters in a system information block (SIB), a radio resource control (RRC) message, a medium access control (MAC) control element (MAC-CE), and/or downlink control information (DCI).
  • SIB system information block
  • RRC radio resource control
  • MAC-CE medium access control element
  • DCI downlink control information
  • the base station may transmit the signaling that indicates the one or more common delay or common timing offset parameters to the UE directly (e.g., without any intermediate device) or indirectly (e g., via a satellite or other node).
  • the UE may then use the one or more common delay or common timing offset parameters to compute a common delay or common timing offset (Tdeiay) for a particular uplink slot.
  • Tdeiay common delay or common timing offset
  • the UE may need to compute the common delay or common timing offset at time tn, which generally corresponds to a starting time for uplink slot N.
  • the common delay or common timing offset at time IN may be defined as the oneway delay of a hypothetical transmission from the satellite to the reference point such that an arrival time of the transmission at the reference point is IN (e.g., the starting time of uplink slot N).
  • the common delay or timing offset at time IN may be defined as half of the round-trip time between the reference point and the satellite for the uplink slot N that starts at time tN.
  • the round-trip time between the reference point and the satellite for the uplink slot N may be the round-trip time for a hypothetical transmission to travel from the reference point to the satellite and then from the satellite back to the reference point such that the hypothetical transmission is received at the reference point at the starting time of uplink slot A (e.g., at time tw).
  • the round-trip time may include a one-way delay for the hypothetical transmission to travel from the reference point to the satellite, denoted as Td g in Fig.
  • the common delay or timing offset at time tN may be defined as half of the round-trip time between the reference point and the satellite for the uplink slot N that starts at time tN
  • the difference between T dg and T ug may depend only on movement of the reference point (e.g., due to the rotation of the Earth).
  • the common delay or common timing offset parameters may include a common delay or timing offset value at a particular time instant and one or more derivatives of the common delay or timing offset at the particular time instant (e.g., first and higher-order denvatives).
  • a common delay or timing offset value at a particular time instant e.g., first and higher-order denvatives.
  • an actual transmission from the satellite to the reference point is not instantaneous (e.g., limited by the speed of light), whereby the satellite and/or the reference point may change locations during the transmission time.
  • the reference point may move due to the rotation of the Earth, and the satellite may move in an orbital trajectory around the Earth.
  • the satellite movement in a particular time period is therefore likely to be much larger than the reference point movement in the same time period (e.g ., if a signal takes 10 milliseconds to travel from the reference point to a satellite traveling at around 7000 meters per second, the satellite may move by about 70 meters during the transmission time).
  • the change in location during the transmission time can lead to a large error if the common delay or timing offset parameters were to consider only the relative locations of the satellite and the reference point at the time of transmission.
  • the one-way delay from the satellite to the reference point and/or the round-trip time between the reference point and the satellite may be based on a difference in the location of the transmitter at a first time when a signal is transmitted and the location of the receiver at a second time when the signal is received.
  • the difference in location may indicate a total distance that the signal travels, which may be divided by the speed of light to determine the downlink delay Td g from the reference point to the satellite and/or the uplink delay T ug from the satellite to the reference point.
  • the UE may compute the common delay or common timing offset at other times, and the UE may use the common delay or common timing offset to determine a transmit time for transmitting an uplink signal in a particular uplink slot.
  • the TA for a particular slot N may generally be defined as a time difference between a first time when the UE transmits an uplink signal in uplink slot N and a second time when the UE receives a downlink signal in downlink slot N.
  • transmission of the uplink signal in uplink slot N at the UE occurs before the UE receives the downlink signal in downlink slot N. Accordingly, applying a particular TA value in an uplink slot may require non-causal behavior, whereby the UE may instead compute a transmit time for transmitting an uplink signal in a particular uplink slot.
  • the UE may compute the transmit time for an uplink slot N using the common delay values signaled by the base station and the satellite ephemeris information, which has an epoch time to that corresponds to the starting time of a downlink slot K o at the reference point in which the ephemeris information is signaled.
  • the UE may use the common delay values and the satellite ephemeris information to compute Tdeiay(Ts), which corresponds to the one-way delay from the satellite to the reference point for uplink slot N or half of the round-trip time between the reference point and the satellite for uplink slot N.
  • Tdeiay(Ts) an uplink feeder link delay from the satellite to the reference point, T C 2
  • the UE may then compute a service link delay T s (e.g., based on the closed-loop and/or open-loop parameters described above), where T s is round-trip delay for a transmission to arrive at the satellite at time T4.
  • T s round-trip delay for a transmission to arrive at the satellite at time T4.
  • the UE may compute a slot delay for uplink slot N, denoted SD(/V)> AS the sum of the downlink feeder link delay, the service link delay, and the uplink feeder link delay divided by the slot duration, which is given by (T ci + T s + T C 2)/slot_duration, where the slot delay may be a whole number or a fractional number of slots.
  • the UE may compute the transmit time associated with an uplink signal to be received at the reference point in uplink slot A', and may transmit the uplink signal at the transmit time such that the uplink signal arrives at the reference point at the starting time of uplink slot N.
  • the UE may use a received downlink signal to determine the transmit time, where the UE may start to transmit the uplink signal for uplink slot N (e.g., to the reference point via the satellite) after receiving a sample corresponding to downlink slot N- SD(A).
  • uplink slot N e.g., to the reference point via the satellite
  • the base station may transmit, and the UE may receive, signaling that indicates separate common delay or common timing offset parameters for uplink and downlink slots.
  • the base station may signal the one or more common delay or common timing offset parameters in a SIB, an RRC message, a MAC-CE, and/or DCI, and the UE may use the separate common delay or common timing offset parameters for the uplink and downlink slots in order to compute a first common delay or common timing offset (Uieia .ui.) for an uplink slot and a second common delay or common timing offset (Tdeiay,DL) for a downlink slot.
  • a first common delay or common timing offset Uieia .ui.
  • Tdeiay,DL second common delay or common timing offset
  • an uplink common delay or common timing offset at time tN may be defined as a one-way delay from the satellite to the reference point for the uplink slot N that starts at the reference point at time tN, shown as Tdeiay.uiXA) in Fig. 5B
  • a downlink common delay or common timing offset at time tN may be defined as a one-way delay from the reference point to the satellite for the downlink slot N that starts at the reference point at time tN, shown as T eiay,DL(/V) in Fig. 5B.
  • the common delay or common timing offset parameters that are signaled to the UE may include an uplink common delay or timing offset value and a downlink common delay or timing value at a particular time instant and one or more derivatives of the common delay or timing offset values at the particular time instant (e.g., first and higher- order derivatives).
  • the uplink common delay or common timing offset may indicate the one-way delay associated with a signal that arrives at the reference point from the satellite at the beginning of uplink slot A (e.g., at time t ) and the downlink common delay or common timing offset may indicate the one-way delay associated with a signal that is transmitted from the reference point to the satellite at the beginning of downlink slot N (e.g., at time IN).
  • the UE may compute the uplink and downlink common delay or common timing offset values at other times based on the ephemeris information associated with the satellite.
  • the UE may compute the transmit time for an uplink slot N using the common delay values signaled by the base station and the satellite ephemeris information, which has an epoch time to that corresponds to the starting time of a downlink slot Ko in which the ephemeris information is signaled.
  • the UE may use the common delay values and the satellite ephemeris information to compute T eiay.ui/Ts), which corresponds to the one-way delay from the satellite to the reference point for a transmission to arrive at the reference point at the start of uplink slot N.
  • the UE may then compute a service link delay T s in a similar manner as described above with reference to Fig.
  • T s is defined as a round-trip delay between the satellite and the UE for a transmission to arrive at the satellite at time T 4 .
  • the UE may compute the slot delay for uplink slot N, denoted SD(A), as r ' 1c sum °f the downlink feeder link delay, the service link delay, and the uplink feeder link delay divided by the slot duration, which is given by (Tci + T s + T c2 )/slot_duration, where the slot delay may be a whole number or a fractional number of slots.
  • the UE may compute the transmit time associated with an uplink signal to be received at the reference point in uplink slot A, and may transmit the uplink signal at the transmit time such that the uplink signal arrives at the reference point at the starting time of uplink slot N. For example, as shown by reference number 524, the UE may use a received downlink signal to determine the transmit time, where the UE may start to transmit the uplink signal for uplink slot N (e.g., to the reference point via the satellite) after receiving a sample corresponding to downlink slot N- SD(A).
  • the base station may transmit, and the UE may receive, signaling that indicates approximate common delay or common timing offset parameters for an uplink slot.
  • the base station may signal the approximate common delay or common timing offset parameters in a SIB, an RRC message, a MAC-CE, and/or DCI, and the UE may use the approximate common delay or common timing offset parameters for the uplink slot in order to compute a common delay or common timing offset for an uplink slot N that starts at time tN.
  • the common delay or timing offset at time tN may be approximated based on the geometric distance between the location of the satellite at time tN and the location of the reference point at time tN divided by the speed of light, c.
  • the approximate common delay or timing offset may differ from the one-way delay for a transmission starting from the satellite that arrives at the reference point at time tN and/or a transmission starting from the reference point at time tw because the satellite and/or the reference point may move between transmission and reception times.
  • the UE may approximate the common delay between the satellite and the reference point at a particular time based on the location of the satellite at the particular time since the satellite is typically moving at a faster rate.
  • the distance used may be calculated using the position of the satellite at a time when the satellite performs reception and/or transmission of a signal.
  • the UE may compute the transmit time for an uplink slot N using the approximate common delay value signaled by the base station and the satellite ephemeris information.
  • the actual delay for an uplink signal to arrive at the reference point at time T5 may be based on the geometric distance between the location of the reference point at time T5 and the location of the satellite at time T4.
  • the geometric distance between the location of the reference point at time T5 and the location of the satellite at time T4 may be approximated by the geometric distance between the locations of the reference point and the satellite at time T4.
  • the UE may then compute a service link delay T s in a similar manner as described above with reference to Figs.
  • T s is defined as a round-trip delay between the satellite and the UE for a transmission to arrive at the satellite at time T4.
  • SD(A) the slot delay for uplink slot N
  • the UE may compute the transmit time associated with an uplink signal to be received at the reference point in uplink slot Abased on a time when a downlink signal is received. For example, as shown by reference number 534, the UE may start to transmit the uplink signal for uplink slot A (e g., to the reference point via the satellite) after receiving a sample corresponding to downlink slot A - SD(A).
  • the UE may use a local clock to determine the transmit time (e.g., based on a downlink slot M in which the UE achieves downlink synchronization (e.g., determines downlink timing), such as slot K o when the reference point transmits the satellite ephemeris information).
  • Tdeia T4
  • T4 + TdeiayfU T5
  • T C 2 Tdeiay(T4)
  • T ⁇ the uplink service link delay
  • the UE may transmit the uplink signal for uplink slot N (e.g., to the reference point via the satellite) the time delay TD after the time when receiving the beginning of downlink slot M.
  • FIGS. 5A-5D are provided as examples. Other examples may differ from what is described with regard to Figs. 5A-5D.
  • Fig. 6 is a diagram illustrating an example 600 associated with a direct uplink transmit time calculation in an NTN, in accordance with the present disclosure.
  • example 600 includes communication between a UE, a satellite, and a reference point, which may be provided at a base station or a location between the base station and the satellite.
  • the UE, the satellite, and the reference point may communicate in an NTN (e.g., in a regenerative or transparent deployment).
  • the UE may compute a transmit time for transmitting an uplink signal in an uplink slot A' based on a local clock.
  • the UE then calculates Tsu for the uplink transmission arriving at the satellite at time to + (N- X ) * Ds - Tcu.
  • the downlink at the reference point corresponds to slot A' - Tcu / Ds, where the term slot is used in Fig. 6 to indicate a time with possible fractional numbers.
  • the downlink at the satellite at this time instant corresponds to an earlier downlink transmitted from the reference point. Because the UE does not know directly the downlink slot time at the satellite, the UE calculation may be simplified in cases where the epoch time or reference time associated with the satellite ephemeris is at the reference point.
  • the UE may determine the transmit time of for slot N as to + (N- M) * Ds -Ten - Tsu.
  • E e.g., representing the predicted time when the beginning of downlink slot N is received at the UE
  • E may be set to to + (N- M) * Ds + Ted + Tsd
  • the downlink signal received at this time corresponds to slot A- Y, where Y is a number of slots between a slot in which an uplink transmission is performed and downlink reception corresponding to slot N, where X * Ds may differ from Y * Ds in terms of time based on the downlink signal, which is non-uniform with respect to an ideal clock.
  • X is in terms of a time difference in terms of an ideal clock, and a difference between A and Y can be up to 2 microseconds assinning a 20 millisecond one-way delay and a 100 microsecond per second round-trip timing variation rate.
  • Fig. 6 is provided as an example. Other examples may differ from what is described with regard to Fig. 6.
  • Fig. 7 is a diagram illustrating an example process 700 performed, for example, by an apparatus, in accordance with the present disclosure.
  • Example process 700 is an example where the apparatus (e.g., UE 120) performs operations associated with common timing offset signaling in an NTN.
  • the apparatus e.g., UE 120
  • process 700 may include obtaining, from a network node, signaling indicating one or more common timing offset parameters that are based at least in part on one or more delays between a satellite and a reference point in an NTN (block 710).
  • the apparatus e.g., using communication manager 140 and/or reception component 902, depicted in Fig. 9 may obtain, from a network node, signaling indicating one or more common timing offset parameters that are based at least in part on one or more delays between a satellite and a reference point in an NTN, as described above.
  • process 700 may include determining a transmit time for an uplink signal based at least in part on the one or more common timing offset parameters and a starting time associated with an uplink slot in which the uplink signal is to arrive at the reference point (block 720).
  • the apparatus e.g., using communication manager 140 and/or determination component 908, depicted in Fig. 9 may determine a transmit time for an uplink signal based at least in part on the one or more common timing offset parameters and a starting time associated with an uplink slot in which the uplink signal is to arrive at the reference point, as described above.
  • process 700 may include outputting the uplink signal for transmission at the transmit time (block 730).
  • the apparatus e.g., using communication manager 140 and/or transmission component 904, depicted in Fig. 9
  • Process 700 may include additional aspects, such as any single aspect or any combination of aspects described below and/or in connection with one or more other processes described elsewhere herein.
  • the reference point corresponds to a location in the NTN where downlink slots and uplink slots are synchronized and a slot duration is constant overtime.
  • the reference point is at the network node.
  • the reference point is in a path between the satellite and the network node.
  • process 700 includes obtaining, from the network node, signaling that indicates ephemeris information associated with the satellite, wherein the transmit time is further based at least in part on an epoch time for the ephemeris information.
  • the epoch time for the ephemeris information is at a starting time for a downlink slot at the reference point.
  • the one or more common timing offset parameters include one or more of values for the one or more delays between the satellite and the reference point or one or more derivatives of the one or more delays between the satellite and the reference point.
  • the one or more common timing offset parameters include a one-way delay from the satellite to the reference point for a transmission to arrive at the reference point at a starting time of an uplink slot at the reference point.
  • the one or more common timing offset parameters include half of a round-trip delay between the reference point and the satellite for a transmission to arrive at the reference point at a starting time of an uplink slot at the reference point.
  • the one or more common timing offset parameters include a one-way delay from the reference point to the satellite for a transmission performed by the reference point at a starting time of a downlink slot at the reference point.
  • the one or more common timing offset parameters include a geometric distance between the reference point and the satellite at a starting time of an uplink slot at the reference point.
  • the one or more common timing offset parameters are indicated in a SIB, an RRC message, a MAC-CE, or DCI.
  • the transmit time is UE-specific.
  • process 700 may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in Fig. 7. Additionally, or alternatively, two or more of the blocks of process 700 may be performed in parallel.
  • Fig. 8 is a diagram illustrating an example process 800 performed, for example, by an apparatus, in accordance with the present disclosure.
  • Example process 800 is an example where the apparatus (e.g., a network node, such as base station 110) performs operations associated with common timing offset signaling in an NTN.
  • the apparatus e.g., a network node, such as base station 110
  • process 800 may include determining one or more delays between a satellite and a reference point in an NTN (block 810).
  • the apparatus e.g., using communication manager 150 and/or determination component 1008, depicted in Fig. 10) may determine one or more delays between a satellite and a reference point in an NTN, as described above.
  • process 800 may include outputting, for transmission to a UE, signaling indicating one or more common timing offset parameters that are based at least in part on the one or more delays between the satellite and the reference point (block 820).
  • the apparatus e.g., using communication manager 150 and/or transmission component 1004, depicted in Fig. 10
  • Process 800 may include additional aspects, such as any single aspect or any combination of aspects described below and/or in connection with one or more other processes described elsewhere herein.
  • the reference point corresponds to a location in the NTN where downlink slots and uplink slots are synchronized and a slot duration is constant overtime. [0126] In a second aspect, alone or in combination with the first aspect, the reference point is at the apparatus.
  • the reference point is in a path between the satellite and the apparatus.
  • process 800 includes outputting, for transmission to the UE, signaling that indicates ephemeris information associated with the satellite, wherein the one or more common timing offset parameters are further based at least in part on an epoch time for the ephemeris information.
  • the epoch time for the ephemeris information is at a starting time for a downlink slot at the reference point.
  • the one or more common timing offset parameters include one or more of values for the one or more delays between the satellite and the reference point or one or more derivatives of the one or more delays between the satellite and the reference point.
  • the one or more common timing offset parameters include a one-way delay from the satellite to the reference point for a transmission to arrive at the reference point at a starting time of an uplink slot at the reference point.
  • the one or more common timing offset parameters include half of a round-trip delay between the reference point and the satellite for a transmission to arrive at the reference point at a starting time of an uplink slot at the reference point.
  • the one or more common timing offset parameters include a one-way delay from the reference point to the satellite for a transmission performed by the reference point at a starting time of a downlink slot at the reference point.
  • the one or more common timing offset parameters include a geometric distance between the reference point and the satellite at a starting time of an uplink slot at the reference point.
  • the one or more common timing offset parameters are indicated in a SIB, an RRC message, a MAC-CE, or DCI.
  • process 800 includes obtaining, from the UE, an uplink signal that was transmitted at a UE-specific transmit time that is based at least in part on the one or more common timing offset parameters and a starting time associated with an uplink slot in which the uplink signal is to arrive at the reference point.
  • process 800 may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in Fig. 8. Additionally, or alternatively, two or more of the blocks of process 800 may be performed in parallel.
  • Fig. 9 is a diagram of an example apparatus 900 for wireless communication.
  • the apparatus 900 may be a UE, or a UE may include the apparatus 900.
  • the apparatus 900 includes a reception component 902 and a transmission component 904, which may be in communication with one another (for example, via one or more buses and/or one or more other components).
  • the apparatus 900 may communicate with another apparatus 906 (such as a UE, a base station, or another wireless communication device) using the reception component 902 and the transmission component 904.
  • the apparatus 900 may include the communication manager 140.
  • the communication manager 140 may include a determination component 908, among other examples.
  • the apparatus 900 may be configured to perform one or more operations described herein in connection with Fig. 4, Figs. 5A-5D, and/or Fig. 6. Additionally, or alternatively, the apparatus 900 may be configured to perform one or more processes described herein, such as process 700 of Fig. 7.
  • the apparatus 900 and/or one or more components shown in Fig. 9 may include one or more components of the UE described in connection with Fig. 2. Additionally, or alternatively, one or more components shown in Fig. 9 may be implemented within one or more components described in connection with Fig. 2. Additionally, or alternatively, one or more components of the set of components may be implemented at least in part as software stored in a memory. For example, a component (or a portion of a component) may be implemented as instructions or code stored in a non-transitory computer-readable medium and executable by a controller or a processor to perform the functions or operations of the component.
  • the reception component 902 may receive communications, such as reference signals, control information, data communications, or a combination thereof, from the apparatus 906.
  • the reception component 902 may provide received communications to one or more other components of the apparatus 900.
  • the reception component 902 may perform signal processing on the received communications (such as filtering, amplification, demodulation, analog-to-digital conversion, demultiplexing, deinterleaving, de-mapping, equalization, interference cancellation, or decoding, among other examples), and may provide the processed signals to the one or more other components of the apparatus 900.
  • the reception component 902 may include one or more antennas, a modem, a demodulator, a MIMO detector, a receive processor, a controller/processor, a memory, or a combination thereof, of the UE described in connection with Fig. 2.
  • the transmission component 904 may transmit communications, such as reference signals, control information, data communications, or a combination thereof, to the apparatus 906.
  • one or more other components of the apparatus 900 may generate communications and may provide the generated communications to the transmission component 904 for transmission to the apparatus 906.
  • the transmission component 904 may perform signal processing on the generated communications (such as fdtering, amplification, modulation, digital-to-analog conversion, multiplexing, interleaving, mapping, or encoding, among other examples), and may transmit the processed signals to the apparatus 906.
  • the transmission component 904 may include one or more antennas, a modem, a modulator, a transmit MIMO processor, a transmit processor, a controller/processor, a memory, or a combination thereof, of the UE described in connection with Fig. 2. In some aspects, the transmission component 904 may be co-located with the reception component 902 in a transceiver.
  • the reception component 902 may obtain, from a network node, signaling indicating one or more common timing offset parameters that are based at least in part on one or more delays between a satellite and a reference point in an NTN.
  • the determination component 908 may determine a transmit time for an uplink signal based at least in part on the one or more common timing offset parameters and a starting time associated with an uplink slot in which the uplink signal is to arrive at the reference point.
  • the transmission component 904 may output the uplink signal for transmission at the transmit time.
  • the reception component 902 may obtain, from the network node, signaling that indicates ephemeris information associated with the satellite, wherein the transmit time is further based at least in part on an epoch time for the ephemeris information.
  • Fig. 9 The number and arrangement of components shown in Fig. 9 are provided as an example. In practice, there may be additional components, fewer components, different components, or differently arranged components than those shown in Fig. 9. Furthermore, two or more components shown in Fig. 9 may be implemented within a single component, or a single component shown in Fig. 9 may be implemented as multiple, distributed components. Additionally, or alternatively, a set of (one or more) components shown in Fig. 9 may perform one or more functions described as being performed by another set of components shown in Fig. 9.
  • Fig. 10 is a diagram of an example apparatus 1000 for wireless communication.
  • the apparatus 1000 may be a base station, or a base station may include the apparatus 1000.
  • the apparatus 1000 includes a reception component 1002 and a transmission component 1004, which may be in communication with one another (for example, via one or more buses and/or one or more other components).
  • the apparatus 1000 may communicate with another apparatus 1006 (such as a UE, a base station, or another wireless communication device) using the reception component 1002 and the transmission component 1004.
  • the apparatus 1000 may include the communication manager 150.
  • the communication manager 150 may include a determination component 1008, among other examples.
  • the apparatus 1000 may be configured to perform one or more operations described herein in connection with Fig. 4, Figs. 5A-5C, and/or Fig. 6. Additionally, or alternatively, the apparatus 1000 may be configured to perform one or more processes described herein, such as process 800 of Fig. 8.
  • the apparatus 1000 and/or one or more components shown in Fig. 10 may include one or more components of the base station described in connection with Fig. 2. Additionally, or alternatively, one or more components shown in Fig. 10 may be implemented within one or more components described in connection with Fig. 2. Additionally, or alternatively, one or more components of the set of components may be implemented at least in part as software stored in a memory. For example, a component (or a portion of a component) may be implemented as instructions or code stored in a non- transitory computer-readable medium and executable by a controller or a processor to perform the functions or operations of the component.
  • the reception component 1002 may receive communications, such as reference signals, control information, data communications, or a combination thereof, from the apparatus 1006.
  • the reception component 1002 may provide received communications to one or more other components of the apparatus 1000.
  • the reception component 1002 may perform signal processing on the received communications (such as filtering, amplification, demodulation, analog-to-digital conversion, demultiplexing, deinterleaving, de-mapping, equalization, interference cancellation, or decoding, among other examples), and may provide the processed signals to the one or more other components of the apparatus 1000.
  • the reception component 1002 may include one or more antennas, a modem, a demodulator, a MIMO detector, a receive processor, a controller/processor, a memory, or a combination thereof, of the base station described in connection with Fig. 2.
  • the transmission component 1004 may transmit communications, such as reference signals, control information, data communications, or a combination thereof, to the apparatus 1006.
  • one or more other components of the apparatus 1000 may generate communications and may provide the generated communications to the transmission component 1004 for transmission to the apparatus 1006.
  • the transmission component 1004 may perform signal processing on the generated communications (such as filtering, amplification, modulation, digital-to-analog conversion, multiplexing, interleaving, mapping, or encoding, among other examples), and may transmit the processed signals to the apparatus 1006.
  • the transmission component 1004 may include one or more antennas, a modem, a modulator, a transmit MIMO processor, a transmit processor, a controller/processor, a memory, or a combination thereof, of the base station described in connection with Fig. 2. In some aspects, the transmission component 1004 may be co-located with the reception component 1002 in a transceiver.
  • the determination component 1008 may determine one or more delays between a satellite and a reference point in an NTN.
  • the transmission component 1004 may output, for transmission to a UE, signaling indicating one or more common timing offset parameters that are based at least in part on the one or more delays between the satellite and the reference point.
  • the transmission component 1004 may output, for transmission to the UE, signaling that indicates ephemeris information associated with the satellite, wherein the one or more common timing offset parameters are further based at least in part on an epoch time for the ephemeris information.
  • the reception component 1002 may obtain, from the UE, an uplink signal that was transmitted at a UE-specific transmit time that is based at least in part on the one or more common timing offset parameters and a starting time associated with an uplink slot in which the uplink signal is to arrive at the reference point.
  • Fig. 10 The number and arrangement of components shown in Fig. 10 are provided as an example. In practice, there may be additional components, fewer components, different components, or differently arranged components than those shown in Fig. 10. Furthermore, two or more components shown in Fig. 10 may be implemented within a single component, or a single component shown in Fig. 10 may be implemented as multiple, distributed components. Additionally, or alternatively, a set of (one or more) components shown in Fig. 10 may perform one or more functions described as being performed by another set of components shown in Fig. 10.
  • a method for wireless communication at a UE comprising: obtaining, from a network node, signaling indicating one or more common timing offset parameters that are based at least in part on one or more delays between a satellite and a reference point in an NTN; determining a transmit time for an uplink signal based at least in part on the one or more common timing offset parameters and a starting time associated with an uplink slot in which the uplink signal is to arrive at the reference point; and outputting the uplink signal for transmission at the transmit time.
  • Aspect 2 The method of Aspect 1, wherein the reference point corresponds to a location in the NTN where downlink slots and uplink slots are synchronized and a slot duration is constant over time.
  • Aspect 3 The method of Aspect 2, wherein the reference point is at the network node.
  • Aspect 4 The method of Aspect 2, wherein the reference point is in a path between the satellite and the network node.
  • Aspect 5 The method of any of Aspects 1-4, further comprising: obtaining, from the network node, signaling that indicates ephemeris information associated with the satellite, wherein the transmit time is further based at least in part on an epoch time for the ephemeris information.
  • Aspect 6 The method of Aspect 5, wherein the epoch time for the ephemeris information is at a starting time for a downlink slot at the reference point.
  • Aspect 7 The method of any of Aspects 1-6, wherein the one or more common timing offset parameters include one or more of values for the one or more delays between the satellite and the reference point or one or more derivatives of the one or more delays between the satellite and the reference point.
  • Aspect 8 The method of any of Aspects 1-7, wherein the one or more common timing offset parameters include a one-way delay from the satellite to the reference point for a transmission to arrive at the reference point at a starting time of an uplink slot at the reference point.
  • Aspect 9 The method of any of Aspects 1-7, wherein the one or more common timing offset parameters include half of a round-trip delay between the reference point and the satellite for a transmission to arrive at the reference point at a starting time of an uplink slot at the reference point.
  • Aspect 10 The method of any of Aspects 1-9, wherein the one or more common timing offset parameters include a one-way delay from the reference point to the satellite for a transmission performed by the reference point at a starting time of a downlink slot at the reference point.
  • Aspect 11 The method of any of Aspects 1-10, wherein the one or more common timing offset parameters include a geometric distance between the reference point and the satellite at a starting time of an uplink slot at the reference point.
  • Aspect 12 The method of any of Aspects 1-11, wherein the one or more common timing offset parameters are indicated in a SIB, an RRC message, a MAC-CE, or DCI.
  • Aspect 13 The method of any of Aspects 1-12, wherein the transmit time is UE- specific.
  • Aspect 14 A method for wireless communication at a network node, comprising: determining one or more delays between a satellite and a reference point in an NTN; and outputting, for transmission to a UE, signaling indicating one or more common timing offset parameters that are based at least in part on the one or more delays between the satellite and the reference point.
  • Aspect 15 The method of Aspect 14, wherein the reference point corresponds to a location in the NTN where downlink slots and uplink slots are synchronized and a slot duration is constant over time.
  • Aspect 16 The method of Aspect 15, wherein the reference point is at the network node.
  • Aspect 17 The method of Aspect 15, wherein the reference point is in a path between the satellite and the network node.
  • Aspect 18 The method of any of Aspects 14-17, further comprising: outputting, for transmission to the UE, signaling that indicates ephemeris information associated with the satellite, wherein the one or more common timing offset parameters are further based at least in part on an epoch time for the ephemeris information.
  • Aspect 19 The method of Aspect 18, wherein the epoch time for the ephemeris information is at a starting time for a downlink slot at the reference point.
  • Aspect 20 The method of any of Aspects 14-19, wherein the one or more common timing offset parameters include one or more of values for the one or more delays between the satellite and the reference point or one or more derivatives of the one or more delays between the satellite and the reference point.
  • Aspect 21 The method of any of Aspects 14-20, wherein the one or more common timing offset parameters include a one-way delay from the satellite to the reference point for a transmission to arrive at the reference point at a starting time of an uplink slot at the reference point.
  • Aspect 22 The method of any of Aspects 14-21, wherein the one or more common timing offset parameters include half of a round-trip delay between the reference point and the satellite for a transmission to arrive at the reference point at a starting time of an uplink slot at the reference point.
  • Aspect 23 The method of any of Aspects 14-22, wherein the one or more common timing offset parameters include a one-way delay from the reference point to the satellite for a transmission performed by the reference point at a starting time of a downlink slot at the reference point.
  • Aspect 24 The method of any of Aspects 14-23, wherein the one or more common timing offset parameters include a geometric distance between the reference point and the satellite at a starting time of an uplink slot at the reference point.
  • Aspect 25 The method of any of Aspects 14-24, wherein the one or more common timing offset parameters are indicated in a SIB, an RRC message, a MAC-CE, or DCI.
  • Aspect 26 The method of any of Aspects 14-25, further comprising: obtaining, from the UE, an uplink signal that was transmitted at a UE-specific transmit time that is based at least in part on the one or more common timing offset parameters and a starting time associated with an uplink slot in which the uplink signal is to arrive at the reference point.
  • Aspect 27 An apparatus for wireless communication, comprising: a memory comprising instractions; and one or more processors configured to execute the instructions and cause the apparatus to perform the method of one or more of Aspects 1-13.
  • Aspect 28 A UE, comprising: a transceiver; a memory comprising instructions; and one or more processors configured to execute the instructions and cause the UE to perform the method of one or more of Aspects 1-13, wherein the transceiver is configured to receive the signaling indicating the one or more common timing offset parameters, transmit the uplink signal at the transmit time, or receive the signaling that indicates the ephemeris information associated with the satellite.
  • Aspect 29 An apparatus for wireless communication, comprising at least one means for performing the method of one or more of Aspects 1-13.
  • Aspect 30 A non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by an apparatus to perform the method of one or more of Aspects 1-13.
  • Aspect 31 An apparatus for wireless communication, comprising: a memory comprising instructions; and one or more processors configured to execute the instructions and cause the apparatus to perform the method of one or more of Aspects 14-26.
  • a network node comprising: a transceiver; a memory comprising instructions; and one or more processors configured to execute the instructions and cause the network node to perform the method of one or more of Aspects 14-26, wherein the transceiver is configured to transmit the signaling indicating the one or more common timing offset parameters, transmit the signaling that indicates the ephemeris information associated with the satellite, or receive the uplink signal that was transmitted at the transmit time.
  • Aspect 33 An apparatus for wireless communication, comprising at least one means for performing the method of one or more of Aspects 14-26.
  • Aspect 34 A non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by an apparatus to perform the method of one or more of Aspects 14-26.
  • the term “component” is intended to be broadly construed as hardware and/or a combination of hardware and software.
  • “Software” shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, and/or functions, among other examples, whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.
  • a “processor” is implemented in hardware and/or a combination of hardware and software. It will be apparent that systems and/or methods described herein may be implemented in different forms of hardware and/or a combination of hardware and software.
  • satisfying a threshold may, depending on the context, refer to a value being greater than the threshold, greater than or equal to the threshold, less than the threshold, less than or equal to the threshold, equal to the threshold, not equal to the threshold, or the like.
  • “at least one of: a, b, or c” is intended to cover a, b, c, a + b, a + c, b + c, and a + b + c, as well as any combination with multiples of the same element (e.g., a + a, a + a + a, a + a + b, a + a + c, a + b + b, a + c + c, b + b, b + b + b, b + b + c, c + c, and c + c + c, or any other ordering of a, b, and c).
  • the terms “has,” “have,” “having,” or the like are intended to be open-ended terms that do not limit an element that they modify (e.g., an element “having” A may also have B). Further, the phrase “based on” is intended to mean “based, at least in part, on” unless explicitly stated otherwise. Also, as used herein, the term “or” is intended to be inclusive when used in a series and may be used interchangeably with “and/or,” unless explicitly stated otherwise (e.g., if used in combination with “either” or “only one of’).

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
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  • Astronomy & Astrophysics (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Divers aspects de la présente divulgation portent d'une manière générale sur la communication sans fil. Selon certains aspects, un nœud de réseau peut transmettre, et un équipement utilisateur (UE) peut recevoir, une signalisation indiquant un ou plusieurs paramètres de décalage d'horaire commun qui sont basés au moins en partie sur un ou plusieurs retards entre un satellite et un point de référence dans un réseau non terrestre (NTN). L'UE peut déterminer un temps de transmission pour un signal de liaison montante sur la base, au moins en partie, du ou des paramètres de décalage d'horaire commun et d'un temps de départ associé à un créneau de liaison montante dans lequel le signal de liaison montante doit arriver au point de référence. L'UE peut transmettre le signal de liaison montante au moment du temps de transmission. De nombreux autres aspects sont décrits.
PCT/US2022/076873 2021-11-03 2022-09-22 Signalisation de décalage d'horaire commun dans un réseau non terrestre WO2023081555A1 (fr)

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US202163263505P 2021-11-03 2021-11-03
US63/263,505 2021-11-03
US17/654,179 US20230135149A1 (en) 2021-11-03 2022-03-09 Common timing offset signaling in a non-terrestrial network
US17/654,179 2022-03-09

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Citations (1)

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Publication number Priority date Publication date Assignee Title
US20160173188A1 (en) * 2013-07-31 2016-06-16 Ntt Docomo, Inc. Mobile station

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US20160173188A1 (en) * 2013-07-31 2016-06-16 Ntt Docomo, Inc. Mobile station

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ERICSSON: "On UL time and frequency synchronization enhancements for NTN", vol. RAN WG1, no. e-Meeting; 20211011 - 20211019, 1 October 2021 (2021-10-01), XP052058846, Retrieved from the Internet <URL:https://ftp.3gpp.org/tsg_ran/WG1_RL1/TSGR1_106b-e/Docs/R1-2109928.zip> [retrieved on 20211001] *
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