User Equipment Synchronization Using Timing Advance and Frequency Offsets
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Solution Overview
Problem
In non-terrestrial networks, the rapid change in relative distance between a base station and user equipment due to movement causes severe synchronization issues in both downlink and uplink directions, while in terrestrial networks, maintaining synchronization requires significant reference signal overhead.
Innovation Solution
User equipment calculates synchronization values, such as timing advance and frequency offsets, based on assistance information received from the base station, and applies these values for uplink transmissions, optionally reporting them back to the base station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If reference signal and signal design with larger overhead is used to maintain synchronization in terrestrial networks, then synchronization accuracy is improved, but signal overhead increases
Solution Approach 1:
The user equipment performs self-synchronization by autonomously calculating timing advance and frequency offset values based on downlink signal measurements, eliminating the need for extensive network-provided reference signals for synchronization purposes
Solution Approach 2:
The patent replaces the traditional mechanism of using extensive reference signals (a form of signal-based synchronization system) with a calculation-based approach where the UE computes synchronization parameters from measured downlink signal characteristics
2Reliability
If traditional synchronization methods are used in non-terrestrial networks with moving base stations, then synchronization can be maintained, but severe synchronization problems occur due to dramatic distance changes
Solution Approach 1:
The synchronization method is designed to be dynamic and adaptive to changing conditions, with the UE continuously measuring downlink signal characteristics and recalculating synchronization parameters to accommodate rapid distance changes in non-terrestrial networks
Solution Approach 2:
The patent changes the approach from using fixed reference signal patterns to dynamically calculating synchronization parameters based on measured signal characteristics, allowing the system to adapt to varying mobility conditions in both terrestrial and non-terrestrial networks
Data Source
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AI summary
A wireless communication method for use in a wireless terminal is disclosed. The wireless communication method comprises determining at least one synchronization value, and transmitting, to a wireless network node, a signal based on the at least one synchronization value.