Multi-SIM eSIM SI Sharing for Timely 5G NR Updates
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Solution Overview
Problem
Monitoring system information (SI) updates for multiple SIMs and eSIMs on a wireless device with limited wireless circuitry is inefficient and delays availability, particularly in devices supporting dual SIMs or eSIMs connected to shared 5G NR networks.
Innovation Solution
A multi-SIM/eSIM wireless device efficiently shares SI updates between software stacks by designating one SIM/eSIM to monitor and store updated SI values, which are then notified to the other SIM/eSIM, using shared memory and coordinated monitoring mechanisms to reduce redundant computations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If each SIM/eSIM independently monitors system information updates, then each software stack can obtain SI updates autonomously, but computing resources are wasted and SI update availability is delayed
Solution Approach 1:
The patent merges the SI monitoring function across multiple SIM/eSIM software stacks by designating a single primary software stack to perform monitoring and collect SI updates. This consolidated approach eliminates redundant monitoring operations while ensuring that all SIMs/eSIMs receive the necessary system information updates timely and efficiently.
2Loss of information
If multiple software stacks monitor SI updates independently, then each stack has full access to SI information, but resource efficiency decreases and update timing is delayed
Solution Approach 1:
The patent introduces a primary software stack as an intermediary that centrally collects SI updates from the network and distributes them to secondary software stacks. This mediator approach ensures that all SIMs/eSIMs receive complete and consistent SI information while significantly improving update speed by eliminating parallel monitoring delays and redundant processing.
Data Source
AI summary
Embodiments described herein relate to sharing system information (SI) updates on a wireless device that supports multiple subscriber identity modules (SIMs) and/or electronic SIMs (eSIMs). The wireless device connects to a cell of a radio access network shared between two different 5G NR cellular wireless networks managed for two different mobile network operators. The wireless device receives an SI change indication in a first broadcast control channel (BCCH) modification cycle via a first SIM or eSIM and subsequently receives updated SI values, using either the first SIM or eSIM or a second SIM or eSIM depending on connectivity states of the wireless device to the cell. Updated SI values are received via broadcast messages and/or in response to SI request messages on demand and stored in a memory shared by both the first SIM or eSIM and the second SIM or eSIM.