Uplink Frequency Determination via Satellite Reference Point
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Solution Overview
Problem
In non-terrestrial wireless communication networks, determining an accurate uplink transmission frequency is challenging due to multiple sources of frequency errors and Doppler drifts, which can lead to interference and reduced communication efficiency.
Innovation Solution
A method where user equipment determines an uplink transmission frequency based on a reference point, either a satellite or a gateway associated with the satellite, allowing for frequency adjustment to compensate for Doppler drifts and residual frequency errors, with the option to use GNSS capabilities for more accurate frequency determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If uplink transmission frequency is determined without reference point adjustment, then device complexity is reduced, but frequency accuracy deteriorates due to Doppler drifts and residual frequency errors
Solution Approach 1:
The patent introduces a reference point (satellite or gateway) as an intermediary for frequency determination. The UE determines uplink transmission frequency based on a reference point associated with either the satellite providing cell coverage or a gateway associated with the satellite. This intermediary reference point enables accurate frequency compensation for Doppler drifts and residual frequency errors without requiring complex UE-side calculations, thus resolving the contradiction between frequency accuracy and device complexity.
2Object-affected harmful factors
If frequency compensation is not uniformly determined, then adaptability to different network configurations is improved, but interference increases due to inaccurate frequency alignment
Solution Approach 1:
The patent changes the reference parameter for frequency determination from UE-specific calculations to network-defined reference points (satellite or gateway). The network can configure different reference points adaptively based on network topology and service requirements, while UEs uniformly apply frequency compensation relative to their configured reference point. This parameter change approach reduces interference through uniform frequency alignment while maintaining network configuration flexibility through adaptive reference point selection.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach improves the accuracy of uplink transmissions by uniformly determining frequency compensation, reducing interference and enhancing communication efficiency in non-terrestrial networks.
Implementation Method 1
determining an accurate uplink transmission frequency is challenging due to multiple sources of frequency errors and Doppler drifts
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment may determine a transmission frequency for an uplink transmission based at least in part on a reference point for the uplink transmission, the reference point being associated with one of: a satellite that provides a cell covering the user equipment, the satellite being associated with a non-terrestrial network, or a gateway associated with the satellite; and transmit the uplink transmission based at least in part on the transmission frequency. Numerous other aspects are provided.