Multi-SIM Cell Reselection With Reduced-Power Any-Cell Camping
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Solution Overview
Problem
Dual-SIM or Multi-SIM user equipment (UE) devices face inefficiencies in cell selection and reselection processes, leading to excessive processing load and power consumption, which negatively impact battery life and user experience.
Innovation Solution
Implementing a Multi-SIM UE apparatus with executable instructions for determining PLMNs, scanning radio frequencies, and establishing cell states such as multi-camped normally, reduced power any cell selection, and reduced power camped on any cell to optimize cell selection and reselection processes, using relaxed measurement and evaluation criteria.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a Multi-SIM UE performs idle mode procedures such as cell selection and cell reselection on each SIM exactly as if the UE was operating with only one SIM, then the cell selection and reselection procedures are completed for each SIM, but the processing load and power consumption double compared to a single SIM UE
Solution Approach 1:
The patent merges the cell selection and reselection procedures for multiple SIMs into a unified process. The UE determines a single camped cell that can serve multiple SIMs simultaneously, rather than performing separate procedures for each SIM. This combining of procedures reduces the overall processing load and power consumption while maintaining reliable cell selection for all SIMs.
Solution Approach 2:
The patent implements a universal cell selection approach where a single camped cell serves multiple functions for different SIMs. The UE evaluates cells based on unified criteria and selects one cell that can handle communications for multiple SIMs, making the cell selection process multi-functional rather than requiring separate selections for each SIM.
2Reliability
If a Multi-SIM UE performs idle mode procedures such as cell selection and cell reselection on each SIM exactly as if the UE was operating with only one SIM, then the cell selection and reselection procedures are completed for each SIM, but the processing load increases severalfold
Solution Approach 1:
The patent combines cell reselection procedures for multiple SIMs into a single unified process. The UE performs one cell reselection evaluation that considers all SIMs simultaneously, determining a single camped cell that serves multiple SIMs. This merging reduces the processing load from performing separate reselection procedures for each SIM to a single consolidated procedure.
Solution Approach 2:
The patent segments the cell reselection process into distinct evaluation stages: measuring signal quality for multiple cells, evaluating suitability for multiple SIMs, and selecting a single camped cell. This segmentation allows the UE to systematically handle multi-SIM reselection without the complexity of performing full separate procedures for each SIM.
3Adaptability or versatility
If the UE triggers inter-RAT measurement and cell re-selection to inter-RAT re-selection when another inter-RAT frequency has higher priority, then the UE follows specification rules, but the UE loses camping on the current RAT and triggers unnecessary measurements
Solution Approach 1:
The patent applies preliminary anti-action by evaluating whether inter-RAT reselection is truly necessary before triggering the procedure. The UE checks if the current camped cell can still serve both SIMs adequately and only initiates inter-RAT reselection when absolutely required. This prevents unnecessary inter-RAT measurements and reselections that would consume additional battery power.
Solution Approach 2:
The patent implements feedback mechanisms where the UE continuously monitors the suitability of the current camped cell for both SIMs. Based on this feedback, the UE dynamically decides whether to maintain camping on the current RAT or trigger inter-RAT reselection. This feedback-driven approach avoids unnecessary inter-RAT measurements and reduces energy consumption while maintaining adaptability.
Data Source
AI summary
The present application describes methods and systems for cell selection and reselection. One aspect describes the apparatus including a non-transitory memory including executable instructions for cell selection or cell reselection, which when executed by a processor, performs the instructions of determining one or more new public land mobile networks (PLMNs) have been selected. The processor is also configured to execute the instructions of scanning radio frequencies for one or more cells in one or more of the selected PLMNs. The processor is further configured to execute the instructions of determining the one or more cells to be an acceptable cell, a suitable cell, not an acceptable cell, or not a suitable cell. The processor is even further configured to execute the instructions of determining a state of the apparatus to be a multi-camped normally state, a reduced power any cell selection state, a reduced power camped on any cell, a camped normally state, an any cell selection state, or a camped on any cell state.