NTN Random Access Timing Offset for Large Transmission Delays

The patent introduces a timing offset parameter specifically designed for NTN scenarios. The terminal device applies this timing offset to the random access preamble transmission timing, adjusting it based on the difference between actual transmission delay and reference transmission delay. This parameter change enables the system to accommodate large transmission delays and delay differences in NTN while maintaining random access success rates, resolving the contradiction between using simple traditional designs and achieving reliable random access in NTN.

Instead of applying full pre-compensation based on autonomous TA compensation value calculation, the patent introduces a timing offset that provides partial pre-compensation. The timing offset is designed to compensate for the delay difference without requiring perfectly precise positioning information. This partial action approach avoids the timing precision deterioration that would result from calculation errors, while still achieving sufficient collision avoidance between PRACH and other uplink transmissions.

The patent introduces a timing offset as an intermediary parameter that works together with the autonomously calculated TA compensation value. The timing offset serves as a correction mechanism that refines the autonomous calculation results, accounting for NTN-specific delay characteristics. This intermediary approach maintains device autonomy while reducing timing errors that would otherwise lead to failed random access attempts and poor resource utilization.