Multi-SIM UE Power Management for TN Scanning in Remote Areas
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Solution Overview
Problem
User Equipment (UE) with multiple SIMs continuously scans for Terrestrial Network (TN) and Non-Terrestrial Network (NTN) coverage in remote areas, leading to rapid battery drain due to regulatory restrictions and unavailability of TN coverage, resulting in poor user experience.
Innovation Solution
Implement a power management method in UE with multiple SIMs, enabling a primary SIM for TN scanning, disabling other SIMs during TN scanning, and managing NTN access based on reject causes and preset conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE continuously scans for TN coverage in remote areas, then the UE can detect available network services, but the battery drains faster due to increased power consumption
Solution Approach 1:
The patent segments the multiple SIMs into different functional roles: one SIM is designated as the primary scanning SIM responsible for TN coverage detection, while other SIMs are disabled during scanning operations. This segmentation allows the UE to maintain network detection capability through a single active scanning SIM rather than having all SIMs scan simultaneously, thereby reducing overall power consumption while preserving service detection reliability
Solution Approach 2:
The patent implements periodic scanning instead of continuous scanning by enabling the primary SIM to scan for TN coverage at predetermined intervals. The UE determines whether to perform scanning based on stored TN coverage information and timing conditions, allowing the system to balance between detecting network availability and conserving battery power through time-based periodic operations
2Reliability
If the UE scans for both TN and NTN coverage simultaneously, then comprehensive network service availability is ensured, but power consumption increases leading to faster battery drain
Solution Approach 1:
The patent applies local quality by assigning different operational states to different SIMs based on their roles and the current scanning context. The primary SIM is enabled for TN scanning when needed, while other SIMs are selectively disabled during these periods. This localized control of SIM activation ensures that only the necessary SIM performs scanning operations, reducing overall power consumption while maintaining comprehensive network service availability through coordinated SIM management
3Reliability
If the UE constantly searches for NTN coverage after receiving reject cause, then NTN service availability is maximized, but battery life is reduced due to increased power consumption
Solution Approach 1:
The patent implements preliminary action by storing TN coverage information and reject cause information in advance, and using this stored information to make intelligent decisions about whether to perform subsequent scanning operations. Instead of constantly searching for NTN coverage after receiving a reject cause, the UE checks stored information first and only scans when conditions warrant, thereby preserving battery life while maintaining NTN service availability when genuinely needed
Data Source
AI summary
A method of power management in a User Equipment (UE) including a plurality of Subscriber Identity Modules (SIMs), includes: enabling, by the UE, one of plurality of SIMs as a primary SIM when the UE is in a location with no Terrestrial Network (TN) coverage, wherein the primary SIM performs a scanning for availability of the TN coverage; disabling, by the UE, one or more of the plurality of SIMs while the primary SIM scans for the TN coverage, wherein the one or more of the plurality of SIMs are different from the primary SIM; and enabling, by the UE, the one or more of the plurality of SIMs of the UE, based on detecting the availability of the TN coverage in response to the scanning performed by the primary SIM.