Uplink Time-Frequency Sync Updates for NTN Communication
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Solution Overview
Problem
In non-terrestrial network communication scenarios, user terminals face challenges in updating uplink time-frequency synchronization parameters in a timely manner, leading to degraded communication quality.
Innovation Solution
A network apparatus configures an update period parameter for terminal apparatuses to ensure timely updates of uplink time-frequency synchronization parameters, using methods such as segmental linear fitting for complex satellite orbits, and sends these parameters through various message types to facilitate accurate synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the terminal calculates uplink time-frequency synchronization parameters based on satellite PVT information and common parameters, then the terminal can initially obtain synchronization parameters, but the parameters cannot be updated in time leading to synchronization errors
Solution Approach 1:
The patent implements periodic updates of uplink time-frequency synchronization parameters by establishing an update period based on satellite orbital characteristics. The network apparatus sends updated common parameters (common TA, common TA rate, Doppler, Doppler rate) at regular intervals defined by this update period, ensuring the terminal receives timely synchronization updates without requiring continuous calculation
Solution Approach 2:
The network apparatus pre-calculates and determines the update period based on satellite orbital information and terminal position information before the terminal needs to update parameters. This preliminary determination of the update timing allows the system to proactively provide updated parameters before synchronization errors occur, rather than reactively responding to synchronization failures
2Reliability
If the network provides common timing advance and Doppler parameters for NTN communication, then uplink synchronization can be maintained, but parameter updates are delayed affecting communication quality
Solution Approach 1:
The patent makes the parameter update mechanism dynamic by setting the update period based on actual satellite orbital characteristics and terminal position. Rather than using fixed update intervals, the system adapts the update frequency to match the dynamic changes in satellite position and orbital velocity, ensuring updates occur at optimal intervals to maintain communication reliability without unnecessary delays
Data Source
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AI summary
Embodiments of this application disclose a parameter update method, including: A terminal apparatus receives a parameter that is configured by a network apparatus and that is used to calculate an update period, where the update period is used to indicate time at which the terminal apparatus receives an uplink time-frequency synchronization parameter; and the terminal apparatus receives an updated uplink time-frequency synchronization parameter based on the update period. The network apparatus configures the parameter for calculating the update period, so that the terminal apparatus can update the uplink time-frequency synchronization parameter in time. This reduces an error of uplink time-frequency synchronization, and ensures communication quality.