Timing Advance Command Handling in Non-Terrestrial Networks
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Solution Overview
Problem
Non-terrestrial communication systems face challenges in timing corrections due to long propagation distances and fast satellite movements, leading to potential overcompensation of timing errors, which existing methods fail to adequately address.
Innovation Solution
A user equipment (UE) is configured to receive timing advance commands from non-terrestrial network nodes, check for recent timing advance information, and apply or ignore these commands based on the availability of new information within a specified time interval to prevent overcompensation, employing a conditional mode for timing adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If timing advance commands are applied continuously to correct timing errors in non-terrestrial networks, then timing synchronization is improved, but overcompensation occurs leading to timing inaccuracies
Solution Approach 1:
The patent applies dynamics by making the timing advance command application conditional rather than continuous. The UE dynamically adjusts its behavior based on whether new timing advance information has been received within a specified time interval, switching between applying commands and ignoring them based on current conditions
Solution Approach 2:
The patent implements feedback by having the UE check whether new timing advance information has been received within a time interval before applying timing advance commands. This feedback mechanism prevents overcompensation by only applying commands when appropriate timing conditions are met
2Measurement precision
If timing advance commands are applied frequently to maintain synchronization, then timing alignment is improved, but unnecessary corrections increase latency
Solution Approach 1:
The patent applies periodic action by introducing a time interval condition for applying timing advance commands. Instead of continuous correction, the UE checks periodically whether new timing advance information has been received within the specified interval, applying commands only when the condition is satisfied
Solution Approach 2:
The patent uses partial action by selectively applying timing advance commands only when new information has been received within the time interval, rather than applying all received commands. This partial application avoids unnecessary corrections and reduces latency
Data Source
AI summary
A method including, receiving, in an apparatus, a timing advance command from a non-terrestrial network node, checking, in the apparatus, whether the apparatus has received information associated with a timing advance value within a time interval and determining in the apparatus, based on said checking, whether to apply the timing advance command to calculate the timing advance value for communicating with the non-terrestrial network node.