Adaptive Timing Advance for 5G NTN Uplink Synchronization
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Solution Overview
Problem
The challenge in 5G NR non-terrestrial networks (NTN) is achieving uplink synchronization due to fast satellite movement, leading to excessive air interface signaling overhead and delayed TA adjustments, which affect user experience.
Innovation Solution
A wireless communication method where a network device transmits first information for adaptive TA adjustments to a terminal device, allowing it to actively adjust its timing advance based on received information, reducing signaling overhead and improving synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional TA adjustment methods are used in NTN systems, then uplink synchronization can be maintained, but signaling overhead becomes excessive and TA adjustments are delayed
Solution Approach 1:
The patent applies preliminary action by having the terminal device proactively send TA adjustment requests before synchronization degradation occurs. The terminal monitors downlink signal quality and predicts TA needs, initiating adjustment procedures in advance rather than reacting to degradation, thereby reducing overall signaling overhead while maintaining synchronization reliability
Solution Approach 2:
The patent implements feedback mechanisms where the terminal device reports its synchronization status and signal quality measurements to the network device. This feedback loop enables the network to make informed decisions about when TA adjustments are actually needed, avoiding unnecessary signaling while ensuring synchronization is maintained
2Reliability
If frequent TA adjustments are performed to maintain synchronization, then uplink synchronization is improved, but signaling overhead increases
Solution Approach 1:
The patent applies dynamics by making the TA adjustment frequency adaptive rather than fixed. The terminal device dynamically determines when adjustments are needed based on real-time signal quality monitoring and movement detection. During high-speed satellite passages, adjustments occur more frequently; during stable periods, adjustments are reduced, thereby optimizing the balance between synchronization reliability and signaling overhead
Solution Approach 2:
The patent changes the parameter of adjustment frequency from a static configuration to a dynamic value determined by actual synchronization needs. The terminal monitors parameters like signal quality, Doppler shift, and satellite velocity to determine the optimal adjustment interval, reducing unnecessary signaling while maintaining synchronization during critical periods
3Device complexity
If TA adjustments are delayed to reduce signaling frequency, then signaling overhead is reduced, but synchronization accuracy deteriorates
Solution Approach 1:
The terminal device performs preliminary TA calculations based on predicted satellite movement and signal quality trends. By anticipating future synchronization needs and pre-calculating required TA adjustments, the system can maintain synchronization accuracy without waiting for actual degradation, thereby reducing the delay between needed adjustment and actual adjustment
Data Source
AI summary
A wireless communication method, a terminal device, and a network device are provided in implementations of the present disclosure. The wireless communication method includes the following. The terminal device receives first information transmitted by the network device, where the first information is used for the TA adjustment.