User Equipment Cell Re-Selection Using Recommended Lists
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Solution Overview
Problem
Current cell re-selection mechanisms in wireless communication systems, particularly for New Radio (NR) and LTE, do not effectively prioritize cells based on recommended information, leading to difficulties in maintaining service continuity and inefficient utilization of radio resources, especially for intra-frequency service based cell re-selection.
Innovation Solution
A cell re-selection method for user equipment that considers recommended cell information by obtaining and evaluating a list of recommended cells, marking cells as unavailable if they do not belong to the recommended list, and prioritizing cells based on signal quality and status to ensure service continuity and efficient resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a UE performs cell re-selection based on existing frequency priority and signal quality rules without considering recommended cell information, then the cell re-selection process is simple and fast, but service continuity cannot be maintained and radio resource utilization is inefficient
Solution Approach 1:
The network node pre-configures a list of recommended cells to the UE before the UE needs to perform cell re-selection. This preliminary action provides the UE with advance information about which cells are suitable for service continuity, eliminating the need for complex real-time evaluations during cell re-selection and ensuring reliable service maintenance.
2Productivity
If a UE evaluates all measured cells without prioritization based on recommended information, then all cells are considered equally, but radio resource utilization becomes inefficient and service continuity is compromised
Solution Approach 1:
The patent applies different evaluation criteria to different cells based on their classification. Cells in the recommended list receive prioritized consideration with relaxed re-selection conditions, while non-recommended cells follow standard evaluation rules. This local differentiation ensures efficient radio resource utilization while maintaining service continuity through preferential treatment of suitable cells.
3Reliability
If a UE marks non-recommended cells as unavailable, then the UE focuses only on recommended cells for re-selection, but this increases the complexity of cell management
Solution Approach 1:
The patent extracts recommended cells from the complete set of available cells and places them in a separate recommended list. This extraction allows the UE to apply different rules to recommended versus non-recommended cells, maintaining service continuity through focused evaluation of recommended cells while simplifying overall cell management through clear categorization.
4Reliability
If intra-frequency service based cell re-selection is not supported, then the cell re-selection mechanism is simple, but service continuity for intra-frequency cells cannot be maintained
Solution Approach 1:
The patent changes the evaluation parameters for intra-frequency cells by introducing recommended cell information from the network. When a cell is marked as recommended, the UE applies modified re-selection conditions that prioritize service continuity. This parameter change enables intra-frequency service based re-selection without requiring fundamentally new mechanisms, maintaining simplicity while improving reliability.
Data Source
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AI summary
The disclosure is directed to a cell re-selection method used by a user equipment and a user equipment using the same method. In an aspect, the disclosure is direct to a cell re-selection method which is used by a user equipment and includes obtaining a recommended cell list; storing one or more first cells after a signal quality measurement; determining a second cell from the first cells based on the signal quality measurement; determining whether the second cell belongs to the recommended cell list; and performing cell reselection to the second cell in response to having determined that the second cell belongs to the recommended cell list..