Dynamic Cell Reselection Barring for Home PLMN
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently handling cell reselection to intra-frequency, inter-frequency, and inter-radio access technology (inter-RAT) cells of home public land mobile networks (PLMN), particularly when the best cell is not considered as a candidate for reselection due to equivalence issues, leading to unnecessary reselection failures and increased power consumption.
Innovation Solution
A method and apparatus that allow user equipment (UE) to identify and consider a second cell belonging to a home PLMN (HPLMN) as a candidate for reselection without barring it for a period of time, even if it is not an equivalent PLMN (EPLMN), based on absolute priority reselection rules or highest ranking, enabling timely cell reselection without adhering to standard barring periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the second cell belonging to HPLMN is barred for a period of time from being considered as a candidate for reselection, then the network can control roaming behavior, but cell reselection failures increase and power consumption increases
Solution Approach 1:
The patent changes the parameter of cell reselection barring time from a fixed period to a dynamic condition-based approach. Specifically, the second cell is excluded from reselection candidates only when certain conditions are met (such as when the first cell is the best cell according to absolute priority rules), and this exclusion is lifted when conditions change, thereby optimizing both reliability and power consumption.
Solution Approach 2:
The patent introduces dynamic behavior in cell reselection by making the barring period conditional rather than static. The system dynamically adjusts whether the second cell is barred based on real-time conditions such as the quality of the first cell and the ranking of neighboring cells, allowing flexible control that improves both reliability and energy efficiency.
2Productivity
If the second cell is considered as a candidate for reselection without barring, then cell reselection failures decrease and power consumption decreases, but the network control over roaming behavior is reduced
Solution Approach 1:
The patent optimizes the parameter of cell reselection by changing from a static barring approach to a dynamic condition-based approach. The second cell is considered for reselection unless specific conditions are met, thereby improving efficiency while maintaining network control flexibility through conditional exclusions.
Solution Approach 2:
The patent enables dynamic adaptability in cell reselection by making the inclusion/exclusion of the second cell conditional on real-time network conditions. This dynamic approach allows the system to adapt between high efficiency mode (when conditions permit) and controlled roaming mode (when conditions require), thus balancing productivity and adaptability.
3Adaptability or versatility
If the second cell is excluded from reselection candidates for a fixed period, then network control is maintained, but unnecessary reselection failures occur
Solution Approach 1:
The patent changes the parameter of exclusion duration from a fixed period to a condition-based duration. The second cell is excluded only when specific conditions are met (such as when the first cell has superior characteristics), and this exclusion is automatically lifted when conditions change, thereby preventing unnecessary reselection failures while maintaining network control.
Solution Approach 2:
The patent introduces dynamic condition-based control that adapts the exclusion status of the second cell based on real-time network conditions. This dynamic approach ensures that the second cell is excluded only when necessary, preventing unnecessary reselection failures while maintaining network control flexibility when conditions change.
Data Source
AI summary
A method and apparatus for wireless communications are provided. A first cell on which a user equipment (UE) is camped may be identified as a visited Public Land Mobile Network (VPLMN) of the UE. Information of a second cell among neighboring cells of the first cell may be received via a broadcast message from the first cell. The second cell may be part of a home PLMN (HPLMN) and the HPLMN may not be an equivalent PLMN (EPLMN) to the VPLMN associated with the first cell. Alternatively, the second cell may belong to an Equivalent HPLMN (EPLMN). When the second cell is determined to be a best cell according to absolute priority reselection rules or a highest ranked cell among the neighboring cells of the first cell, the second cell may not be barred for a period of time from being considered or identified as a candidate for reselection.