NTN Random Access Channel Resource Configuration
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Solution Overview
Problem
In non-terrestrial network (NTN) systems, the large difference in signal transmission delays between terminal devices and network devices leads to ambiguity in determining the timing advance of terminal devices due to the extended receiving window for random access preambles, causing overlap of receiving windows and incorrect identification of the random access channel occasion.
Innovation Solution
Configuring random access channel resources by sending configuration information to terminal devices to utilize non-overlapping frequency domain resources corresponding to different time domain resources within a preset time, allowing the network device to determine the time domain resource and timing advance of terminal devices based on the received random access preamble.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the time length of the receiving window is extended to accommodate large transmission delay differences in NTN systems, then the network device can receive random access preambles from terminal devices in different positions, but receiving windows corresponding to adjacent ROs will overlap in the time domain, causing the network device to be unable to determine which RO the preamble was sent in
Solution Approach 1:
The patent introduces frequency domain resources as an additional dimension to distinguish between different ROs. Instead of relying solely on time domain separation, the network device assigns different frequency domain resources to different ROs. This allows the receiving window to be extended in time while maintaining the ability to identify which RO a preamble belongs to through frequency domain differentiation.
2Adaptability or versatility
If the time length of the receiving window is extended, then terminal devices in different positions can send preambles within the same coverage area, but the network device cannot determine the TA value due to window overlap ambiguity
Solution Approach 1:
The patent uses frequency domain resources as an additional dimension to resolve the timing measurement ambiguity. By associating different frequency domain resources with different ROs, the network device can first identify the RO through frequency domain detection, then use this information to correctly determine the TA value, thereby maintaining measurement precision while extending coverage.
3Productivity
If the same RACH resource is used by terminal devices in different positions in the same coverage area, then resource utilization is efficient, but the large transmission delay difference in NTN systems causes significant time difference in preamble arrival at the network device
Solution Approach 1:
The patent segments the RACH resources by introducing frequency domain division. Different ROs are assigned different frequency domain resources, which allows the system to accommodate terminal devices with different transmission delays while maintaining efficient resource utilization. This segmentation enables multiple preambles to coexist in the same time window without causing timing conflicts.
Data Source
AI summary
Embodiments of the present application provide a method for configuring random access channel resources, a device and a storage medium, configuration information of random access channel (RACH) resources is sent to a terminal device by a network device, and multiple groups of frequency domain resources are configured for the RACH resources, and the multiple groups of frequency domain resources do not overlap, and in any receiving window for a random access preamble, frequency domain resources corresponding to RACH resources on different time domain resources are different.