NTN Random Access Timing Offset for Delayed RAR Windows
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Solution Overview
Problem
In Non-Terrestrial Networks (NTN), the great distance between satellites and the ground causes significant signal transmission delays, preventing terminal devices from using the random access mode to access NTN cells effectively.
Innovation Solution
A wireless communication method that involves determining a first offset for a Random Access Response (RAR) window and initiating it after a preamble transmission on a Secondary Cell (SCell), with monitoring for the RAR on a Primary Cell (PCell) or Primary SCell (PSCell) to optimize the random access procedure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal device uses the random access mode for Terrestrial Network to access NTN cell, then the access procedure follows standard protocol, but the signal transmission delay prevents successful access due to great distance between satellite and ground
Solution Approach 1:
The terminal device performs preliminary timing adjustment by determining a first offset based on NTN cell characteristics before initiating the RAR window. This preliminary action compensates for the signal transmission delay in advance, allowing the terminal to correctly monitor the RAR window despite the delayed response from the satellite, thereby resolving the contradiction between standard random access protocol and NTN-specific delay characteristics
2Reliability
If the terminal device monitors RAR window continuously to ensure successful access, then access reliability improves, but power consumption increases
Solution Approach 1:
The terminal device determines a first offset before initiating the RAR window based on NTN cell characteristics. This preliminary timing adjustment ensures that the terminal monitors the RAR window at the correct time, avoiding continuous or prolonged monitoring. By performing the timing calculation in advance, the system achieves reliable access while minimizing unnecessary power consumption during the monitoring phase
Data Source
AI summary
Embodiments of the present disclosure provide a wireless communication method and a terminal device. The method includes: determining, by a terminal device, a first offset for a Random Access Response, RAR, window; initiating, by the terminal device, the RAR window after the first offset following transmission of a preamble on a Secondary Cell, SCell; and monitoring, by the terminal device, an RAR in the RAR window on a Primary Cell, PCell, or a Primary SCell, PSCell.