NTN Cell Selection Balancing Signal Quality and Coverage Duration
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Solution Overview
Problem
Conventional cell selection methods in non-terrestrial networks (NTN) rely solely on signal power, leading to increased signaling overheads due to frequent reselections when terminals camp on cells with optimal signal quality but short coverage duration, failing to meet diverse scenario and user requirements.
Innovation Solution
A method for cell selection in NTN that considers both signal quality and beam coverage duration, using weighted factors to determine an optimal cell for camping, incorporating beam coverage duration as a key parameter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If cell selection is based solely on signal power, then signal quality is optimized, but cell handover frequency increases and signaling overhead increases
Solution Approach 1:
The patent changes the cell selection parameters from single-parameter (signal power) to multi-parameter (signal power + beam coverage duration). By introducing beam coverage duration as a new selection criterion, the system avoids frequent handovers caused by transient signal fluctuations, thereby reducing signaling overhead while maintaining connection stability.
Solution Approach 2:
The patent adds a temporal dimension to cell selection by considering beam coverage duration alongside signal power. This dimensional expansion allows the system to evaluate not just the instantaneous signal quality but also the持续性 of coverage, leading to more stable cell selection decisions.
2Device complexity
If cell selection considers only signal power, then measurement simplicity is maintained, but adaptability to different scenarios is insufficient
Solution Approach 1:
The patent extends the measurement parameters from single-parameter (signal power) to multi-parameter (signal power + beam coverage duration). This parameter expansion enables the system to adapt to different communication scenarios (e.g., high-speed movement, coverage edge cases) while maintaining a relatively simple measurement framework.
Solution Approach 2:
The patent creates a universal cell selection mechanism that can handle multiple scenarios through a unified multi-parameter evaluation approach. The same selection criterion (combining signal power and beam coverage duration) works across different user scenarios, including high-speed movement and coverage edge cases, without requiring scenario-specific separate criteria.
3Measurement precision
If terminals camp on cells with optimal signal quality but short coverage duration, then initial signal reception is good, but frequent reselection is required increasing signaling overhead
Solution Approach 1:
The patent modifies the cell selection parameters to include beam coverage duration alongside signal power. By evaluating both parameters, the system identifies cells that provide not only good initial signal reception but also sustained coverage, thereby reducing frequent reselections and the associated signaling overhead.
Solution Approach 2:
The patent performs preliminary evaluation of beam coverage duration during cell selection before the terminal actually camps on the cell. This preliminary assessment prevents the terminal from selecting cells that would require frequent reselection, thereby avoiding future signaling overhead issues.
Data Source
AI summary
A method for selecting a cell in a non-terrestrial network (NTN) The method includes: user equipment queries whether there is first prestored information and determines a frequency for preferential searching based on the first prestored information. The user equipment then determines values of a first decision factor, a second decision factor, a first weighting coefficient, and a second weighting coefficient in a first decision criterion. The user equipment searches for a cell according to the determined first decision criterion and selects a cell with the largest value of the first decision criterion is largest to camp.