Random Access Occasion Design for Non-Terrestrial Network Timing
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Solution Overview
Problem
In non-terrestrial networks (NTNs), the overlapping of preamble receiving windows due to long propagation delays makes it difficult for network nodes to determine the corresponding random access (RA) occasion for received RA preambles, leading to ambiguity in timing advance estimation.
Innovation Solution
The proposed solution involves optimizing the RA occasion design to avoid overlapping between preamble receiving windows and providing specific RA occasion timing information to the network node, enhancing the flexibility of RA configuration and detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If conventional RA occasion design is used in NTN, then coverage area is extended, but preamble receiving windows overlap causing ambiguity in RO determination
Solution Approach 1:
The patent segments the coverage area into multiple non-overlapping preamble receiving windows, each associated with a specific RA occasion. By dividing the continuous coverage area into discrete segments with clear boundaries, the system eliminates ambiguity in determining which RO a received preamble belongs to, while still maintaining extensive overall coverage through the NTN architecture.
2Measurement precision
If RA occasion timing is optimized to avoid window overlap, then RO determination accuracy improves, but RA procedure flexibility decreases
Solution Approach 1:
The patent implements dynamic RA occasion timing configuration where the network can adaptively adjust the timing of RA occasions and preamble receiving windows based on propagation delay conditions. The system dynamically selects from multiple configured ROs with different timing parameters, allowing it to maintain both accurate RO determination (by avoiding overlap) and configuration flexibility (by adapting to different scenarios).
Solution Approach 2:
The system changes key timing parameters such as the start time and duration of preamble receiving windows based on propagation delay measurements. By adjusting these parameters dynamically, the system ensures that windows do not overlap (improving accuracy) while maintaining the ability to adapt to different network conditions and service requirements (preserving flexibility).
Data Source
AI summary
Various embodiments of the present disclosure provide a method for random access. The method which may be performed by a terminal device includes determining a random access occasion based at least in part on random access configuration information for a non-terrestrial network. The method further includes transmitting a preamble to a network node in the non-terrestrial network, according to the determined random access occasion.