User Equipment Cell Ranking for Non-Terrestrial Networks
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Solution Overview
Problem
The large distance between user equipment and satellite or aircraft-based non-terrestrial radio transceivers in non-terrestrial networks results in significant communication delays, which complicates mobility control in these networks.
Innovation Solution
The proposed solution involves a communication control method where user equipment determines the rank of cells during cell reselection and handover, taking into account whether the target cell is a non-terrestrial cell. The user equipment receives a time offset from the source cell to adjust communication timers when performing handover to a non-terrestrial cell, thereby mitigating delay-related issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If user equipment selects non-terrestrial cells for serving cell, then coverage area is extended to remote areas, but communication delay increases significantly
Solution Approach 1:
The patent changes the ranking parameter by introducing a cell type identification mechanism that distinguishes between terrestrial and non-terrestrial cells. User equipment modifies the cell ranking process by applying different evaluation criteria based on cell type, thereby controlling selection behavior to avoid non-terrestrial cells when terrestrial alternatives are available, thus reducing communication delay while maintaining coverage capability.
2Measurement precision
If user equipment applies time offset for non-terrestrial cell communication, then handover timing accuracy is improved, but communication control complexity increases
Solution Approach 1:
The patent applies local quality by introducing differentiated time offset parameters specifically for non-terrestrial cells rather than using uniform timing parameters for all cells. The user equipment identifies non-terrestrial cells through cell type information and applies specific time offset adjustments only to these cells, thereby improving handover timing accuracy for satellite communications without significantly increasing overall system complexity.
Data Source
AI summary
User equipment according to an aspect performs cell reselection of selecting a serving cell by ranking a plurality of cells based on radio quality. Based further on whether a cell is a non-terrestrial cell, the non-terrestrial cell being formed by a radio transceiver of a satellite or an aircraft, the user equipment determines a rank of the cell in the cell reselection.