Multi-SIM Device Cell Reselection Barring Management
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Solution Overview
Problem
Multi-SIM wireless communication devices face cell reselection and handover failures due to barring procedures, particularly when both subscriptions are camped on the same Public Land Mobile Network, leading to network congestion and inefficient resource allocation.
Innovation Solution
The wireless communication device transfers barring information and deprioritizes target cells or frequencies by adjusting their ranks or priorities based on the mode of the second subscription, either by lowering their ranks for idle mode or blacklisting them in connected mode, ensuring efficient resource management and preventing network congestion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cell reselection or handover is performed on a target cell or frequency with high signal strength, then connection quality is improved, but network congestion and reselection failures occur due to barring procedures
Solution Approach 1:
The patent applies preliminary anti-action by detecting cell reselection failures and proactively applying barring procedures to target cells or frequencies before attempting reselection. When a reselection failure is detected, the system bars the target cell or frequency for a predetermined duration, preventing further reselection attempts that would exacerbate network congestion. This anticipatory measure stops harmful reselection behavior before it can cause additional network overload.
Solution Approach 2:
The patent implements preliminary action by measuring signal strength and evaluating cell reselection candidates in advance of actual reselection. The system identifies strong candidate cells or frequencies, assesses their suitability, and prepares barring decisions before reselection is attempted. This advance preparation allows the system to prevent problematic reselections while maintaining the ability to utilize good reselection opportunities.
2Adaptability or versatility
If cell searches and measurements are performed on target cells or frequencies, then reselection options are improved, but reselection failures occur leading to barring of target cells
Solution Approach 1:
The patent implements feedback by continuously monitoring cell reselection outcomes and using this information to adjust future reselection behavior. When reselection failures occur on specific target cells or frequencies, the system records these failures and applies barring procedures. The feedback loop ensures that problematic cells are identified and restricted, while successful reselections continue without restriction. This adaptive feedback mechanism improves overall reselection reliability by learning from past failures.
3Productivity
If the second subscription is camped on the same PLMN as the first subscription, then resource sharing is improved, but cell reselection failures on the first subscription affect the second subscription
Solution Approach 1:
The patent applies segmentation by separating the handling of reselection failures for different subscriptions, even when they share the same PLMN. When a reselection failure occurs on the first subscription, the system applies barring specifically to that subscription's reselection attempts. The second subscription maintains its ability to perform cell searches and measurements independently, unless it experiences its own reselection failures. This segmented approach prevents cross-contamination of barring states while allowing efficient resource sharing on the same PLMN.
Data Source
AI summary
Examples described herein relate to managing reselection for a wireless communication device having a first subscription associated with a first Radio Access Technology (RAT) and a second subscription associated with a second RAT, including determining an occurrence of a barring procedure that bars a target cell or a target frequency for the first subscription for a barring duration and deprioritizing the target cell or the target frequency for the barring duration on the second subscription.