NTN Uplink Slot Offset Control Using TA Pre-Compensation
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Solution Overview
Problem
The existing NR standards do not provide a method to determine the k offset for timing advance (TA) in non-terrestrial networks (NTN), leading to increased signaling overhead and inaccurate control of uplink transmission due to larger propagation delays in satellite communication.
Innovation Solution
A method for determining time-domain resources for uplink transmission by a terminal device based on its TA pre-compensation capability, using a common time slot offset and adjustment amounts configured by the network device, allowing accurate control without additional signaling overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a k offset is introduced to compensate for greater TA in NTN, then the TA compensation capability is improved, but the signaling overhead increases due to lack of determination method
Solution Approach 1:
The terminal device determines the target time slot offset autonomously based on its TA pre-compensation capability and the configured common time slot offset, without requiring additional network signaling. The terminal self-determines whether to use its own TA or the common TA, eliminating the need for explicit k offset signaling while maintaining reliable TA compensation in NTN.
2Device complexity
If traditional NR standards are used for NTN, then the device complexity is maintained, but the time slot offset control precision deteriorates due to larger propagation delays
Solution Approach 1:
The solution introduces dynamic adaptability by allowing the terminal device to flexibly select between different TA determination methods (own TA or common TA) based on its pre-compensation capability. This dynamic approach enables precise time slot offset control for LEO satellites while maintaining compatibility with traditional NR standards for GEO satellites, resolving the contradiction between standard compliance and control precision.
3Manufacturing precision
If additional signaling is used to determine k offset, then the time slot offset control precision is improved, but the signaling overhead increases
Solution Approach 1:
The invention extracts the essential information needed for TA compensation (the common time slot offset configured by network device) and eliminates the need for additional k offset signaling. The terminal device uses its own TA or the common TA directly as the target time slot offset, achieving precise control without extracting or transmitting additional parameters through signaling.
Data Source
AI summary
Provided are a method for determining a time-domain resource of uplink transmission, and a terminal device, a network device and a computer-readable storage medium, which are used to avoid an increase in the more signaling overheads and can achieve accurate control over a slot offset of uplink transmission. Also provided is a terminal device determining, according to whether the terminal device has a timing advance (TA) pre-compensation capability, a target slot offset used for uplink scheduling.