Beamforming-based random access method in NTN, base station device, and user terminal

By introducing a location-based PRACH occasion and preamble selection mechanism into NTN and optimizing beamforming using reference point mapping, the problem of inaccurate UE location positioning in satellite coverage areas is solved, thereby improving the success rate of random access and communication quality.

CN122052896BActive Publication Date: 2026-07-21BEIJING BLUE TOWER OPTICAL TRANSMISSION INTELLIGENT TECHNOLOGY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
BEIJING BLUE TOWER OPTICAL TRANSMISSION INTELLIGENT TECHNOLOGY CO LTD
Filing Date
2026-04-17
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

In non-terrestrial network (NTN) scenarios, the satellite coverage area is vast, leading to inaccurate UE location positioning. During random access, the beam direction deviation is large, reducing the access success rate and increasing inter-beam interference.

Method used

A location-based PRACH occasion and preamble selection mechanism is introduced. By mapping multiple reference points within the beamwidth, each reference point corresponds to a different PRACH occasion and preamble. The base station and user terminal determine the target reference point for beamforming based on the geographical location and system messages, thereby optimizing the random access process.

Benefits of technology

It improves the success rate of random access for user terminals and enhances communication quality through more accurate beam direction and signal-to-noise ratio.

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Abstract

The application discloses a beamforming-based random access method in NTN, a base station device and a user terminal. The method performed by the NTN base station comprises: acquiring a wave position planning parameter in a coverage area, determining a reference point configuration in a wave position based on the wave position planning parameter and a preset reference point mapping rule; sending a system message for different wave positions, wherein the system message carries position information of the current wave position and the reference point configuration; receiving a first signal sent by a user terminal in a random access process, determining a target reference point according to random access resources used by the first signal, and performing beamforming based on the position of the target reference point, and completing the random access with the user terminal. The scheme of the application introduces a geographical position-based selection mechanism to realize beamforming in the random access process on the basis of the selection of the PRACH occasion and the preamble based on the SSB in the traditional 5G system, and improves the success rate of the UE random access.
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