NTN Cell Reselection Using Ephemeris-Based Candidate Cells
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Solution Overview
Problem
The challenge of improving cell selection or reselection efficiency and reducing service interruption delays in non-terrestrial networks (NTN) due to the high-speed movement of non-terrestrial devices, which causes frequent changes in physical coverage areas and triggers procedures like RRC reestablishment or RRC resume.
Innovation Solution
Utilizing ephemeris information of serving and neighboring cells to determine candidate cells for RRC reestablishment or RRC resume, prioritizing cells with suitable signal quality and compatible network devices for interface setup, thereby optimizing cell selection or reselection processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional cell selection or reselection procedures are used in NTN, then the terminal device can maintain basic connectivity, but the service interruption delay increases and the success rate of RRC reestablishment or RRC resume decreases due to high-speed movement and frequent coverage changes
Solution Approach 1:
The network device pre-configures the terminal device with a list of candidate cells and their ephemeris information before the terminal needs to perform cell selection or reselection. This preliminary provision of information allows the terminal to quickly identify suitable target cells without extensive measurement and evaluation procedures, thereby reducing service interruption delay and improving the success rate of RRC reestablishment or RRC resume.
Solution Approach 2:
The patent utilizes ephemeris information (orbital parameters) of non-terrestrial network devices to dynamically determine cell selection criteria. By incorporating temporal and spatial parameters of satellite movement into the cell selection process, the system adapts to the high-speed movement characteristics of NTN, enabling more accurate prediction of suitable target cells and improving reconnection success rates while reducing interruption time.
2Reliability
If the terminal device performs comprehensive cell measurement and evaluation procedures, then the success rate of cell selection improves, but the time required for cell selection or reselection increases
Solution Approach 1:
The network device pre-configures the terminal device with a list of candidate cells and their ephemeris information before the terminal needs to perform cell selection or reselection. This preliminary provision of information allows the terminal to quickly identify suitable target cells without extensive measurement and evaluation procedures, thereby reducing cell selection time while maintaining success rate.
Solution Approach 2:
The patent extracts and utilizes specific key parameters (ephemeris information) from the complete set of cell measurement data. By focusing only on the most critical orbital and temporal parameters rather than performing comprehensive measurements of all cell parameters, the system achieves fast cell selection with high success rate, eliminating unnecessary measurement steps.
Data Source
AI summary
Embodiments of this application provide a communication method and a related apparatus. The method includes: obtaining first information; and selecting, based on the first information, a target cell for cell selection or reselection, where the first information includes a first indication, and the first indication indicates a candidate cell for cell selection or reselection; or the first information includes ephemeris information of a serving cell and ephemeris information of a neighboring cell of the serving cell. According to embodiments of this application, cell selection or reselection efficiency of a terminal device is improved, and a service interruption delay can be shortened.