Cell Selection Method Prioritizing Signal Quality in Hierarchical Structures
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Solution Overview
Problem
Existing cell selection methods in hierarchical cell structures waste radio resources due to inadequate consideration of cell quality, leading to out-of-service situations and inefficient power consumption, especially when mobile terminals move at high speeds.
Innovation Solution
The method prioritizes the Signal criterion (S criterion) over the Hierarchical criterion (H criterion) for cell selection and re-selection, ensuring that only cells meeting the S criterion are considered for ranking, thereby improving the stability and efficiency of cell selection and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If cell selection is performed based on hierarchical cell structure without prioritizing cell quality, then cell reselection can be simplified, but radio resources are wasted and out-of-service situations occur
Solution Approach 1:
The patent changes the parameter priority from H criterion to S criterion in the cell selection process. By modifying the evaluation parameters to prioritize signal quality (S criterion) over hierarchical structure (H criterion), the system ensures reliable cell selection while maintaining simplicity. This parameter change resolves the contradiction by making the selection process more reliable without adding complexity.
2Speed
If cell selection does not prioritize cell quality, then the selection process is faster, but power consumption increases due to unnecessary reselection attempts
Solution Approach 1:
The patent applies preliminary action by pre-establishing the S criterion as the primary selection criterion before the cell selection process begins. This preliminary setup ensures that quality assessment is performed first, preventing unnecessary reselection attempts and reducing power consumption while maintaining fast selection speed. The preliminary prioritization of quality criteria avoids wasted computational resources.
3Area of stationary object
If hierarchical cell structure is used without quality prioritization, then cell coverage is improved, but radio resources are wasted in high-mobility scenarios
Solution Approach 1:
The patent applies local quality by prioritizing signal quality (S criterion) specifically for high-mobility scenarios. Instead of uniformly applying hierarchical cell structure, the system locally adapts the selection criteria to emphasize quality assessment when mobility is detected. This resolves the contradiction by maintaining broad coverage through H criterion while preventing resource waste through S criterion prioritization in high-mobility contexts.
Data Source
AI summary
A cell selection method where, if a hierarchical cell structure (HCS) is used, a first ranking procedure is performed if the UE has low mobility, and a second ranking procedure is performed if the UE has high mobility. When the UE has low mobility, the first ranking procedure is performed for all measured cells that have a highest HCS priority among those cells that fulfill a criterion S and a criterion H≧0, or the ranking procedure is performed for all measured cells regardless of HCS priorities if no cell fulfills the criterion S and the criterion H≧0. When the UE has high mobility, the second ranking procedure is performed for all measured cells, and if there are cells with lower HCS priority than the serving cell that fulfills the criterion S and the criterion H≧0, the ranking procedure is performed for all cells that have the highest HCS priority.