NTN Timing Offset Updates for Faster Timing Advance Adjustment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Terminal devices in non-terrestrial networks (NTN) face insufficient time for timing advance adjustment due to large altitude differences, leading to inefficiencies in timing offset management.
Innovation Solution
A method and apparatus for updating timing offset by sending messages with indication information to ensure sufficient time for timing advance adjustment, using reduced bit signaling and parameters like random access windows and orbital heights to determine updated offsets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If a large timing offset is used to provide sufficient time for timing advance adjustment in NTN, then the terminal device has enough time to make timing advance adjustment, but the end-to-end delay increases and time-frequency resources are wasted
Solution Approach 1:
The timing offset is made dynamic by allowing the terminal device to indicate an updated timing offset to the network device. The network device then uses this updated offset for subsequent messages, enabling the system to adapt the timing offset to current conditions rather than using a fixed large offset throughout the procedure.
Solution Approach 2:
The terminal device provides feedback to the network device about the required timing offset through indication information in the third message. This feedback mechanism allows the network device to adjust the timing offset for subsequent messages based on the terminal's actual needs, reducing unnecessary delays.
2Reliability
If a fixed timing offset is used for all messages, then the terminal device can make timing advance adjustment, but time-frequency resources are wasted due to excessive delay
Solution Approach 1:
The system transitions from a static timing offset approach to a dynamic one where the timing offset can be updated. The terminal device indicates an updated timing offset in the third message, and the network device applies this updated offset for the fifth message, optimizing resource usage while maintaining reliability.
Solution Approach 2:
The timing offset parameter is changed from a fixed value to an updated value based on actual communication needs. The terminal device calculates and indicates the updated timing offset, allowing the system to adjust this parameter dynamically to balance reliability and resource efficiency.
3Stability of the object's composition
If timing offset is not updated, then the terminal device maintains stable timing, but end-to-end delay increases and resources are wasted
Solution Approach 1:
The terminal device provides feedback about the required timing offset through indication information. This feedback allows the network device to update the timing offset appropriately, maintaining stability when needed while reducing delays when conditions change.
Solution Approach 2:
The terminal device autonomously calculates and indicates the updated timing offset it needs, enabling it to self-manage its timing requirements without requiring complex network-side calculations or measurements.
Data Source
AI summary
This application provides a method and an apparatus for updating a timing offset, and is particularly applicable to an NTN network such as satellite communication. The terminal side method includes: A terminal receives a timing offset difference ΔKoffset, and updates a timing offset based on the ΔKoffset to obtain an updated timing offset. The network side method includes: A network device determines a timing offset difference ΔKoffset, and sends the ΔKoffset to a terminal device, wherein the ΔKoffset is used for the terminal device to update a timing offset.