Multi-SIM Camping in Coverage Holes
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Solution Overview
Problem
Multi-SIM wireless devices face challenges in efficiently managing cell camping when in coverage holes of network operators, leading to increased power consumption and limited service availability.
Innovation Solution
The device identifies whether another SIM is already camped on a cell with limited service and suspends the selection process for the affected SIM, attempting to camp on an acceptable cell from a different network operator for limited services if necessary, thereby reducing power consumption while maintaining access to emergency services.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE attempts to camp on a cell of the configured network operator in a coverage hole, then the UE can maintain service availability, but the power consumption increases due to continuous cell reselection attempts
Solution Approach 1:
The UE performs preliminary detection to determine whether it is in a coverage hole before attempting cell camping. By detecting coverage hole conditions in advance and identifying that the configured network operator has no available cells, the UE can preliminarily decide to suspend cell selection for that SIM, thereby avoiding continuous futile reselection attempts and reducing power consumption while maintaining service availability through other SIMs.
2Use of energy by moving object
If the UE suspends cell selection for a SIM in a coverage hole, then the power consumption is reduced, but the service availability for that SIM is limited
Solution Approach 1:
The UE utilizes multiple SIMs with multi-functionality to compensate for service limitations. When one SIM is suspended due to coverage hole conditions, the UE can still access emergency services and other network services through other SIMs that are camped on available cells. This multi-functionality approach ensures that the overall service availability is maintained even though individual SIMs may be limited.
3Reliability
If the UE continuously monitors for cell reselection options, then the service availability is improved, but the processing complexity and power consumption increase
Solution Approach 1:
The UE performs preliminary detection to identify coverage hole conditions and determines whether cell selection should be suspended. This preliminary action allows the UE to avoid continuous complex monitoring and evaluation processes when no suitable cells are available, thereby reducing processing complexity while maintaining service availability through alternative SIMs.
Data Source
AI summary
A user equipment (UE) is equipped with multiple subscriber identity modules (SIMs). The UE identifies a situation requiring selection of a cell to camp on for a first SIM configured to operate using a first mobile network of a first network operator. The UE checks whether the UE is in a coverage hole of the first mobile network. If the UE is not in a coverage hole, the UE camps the first SIM in a cell of the first mobile network. If the UE is in a coverage hole, the UE determines whether any other SIM is already camped on a cell with support for limited service. If there is such other SIM, the UE suspends selection of the cell for the first SIM. Otherwise, the UE camps the first SIM on any acceptable cell for limited service.