Dual-SIM 5G Network Reconnection via Active RRC Re-Establishment
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Solution Overview
Problem
In the EN-DC networking mode of 5G networks, terminals with dual SIM cards face issues where the primary card releases the 5G cell when the secondary card executes services, leading to prolonged network access delays due to the network side's failure to initiate an SCG addition process, affecting user experience.
Innovation Solution
The terminal actively initiates RRC connection re-establishment through the primary card when the secondary card's service ends, triggering the network to add a secondary cell group for the primary card, thereby facilitating quicker reconnection to the 5G network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the network side initiates the SCG addition process, then the primary card can reconnect to the 5G network, but the reconnection is delayed affecting user experience
Solution Approach 1:
Instead of waiting for the network side to initiate the SCG addition process, the terminal actively initiates RRC connection re-establishment to trigger the network side to add the secondary cell. This inversion of the initiation role changes the passive waiting approach into an active triggering approach, significantly reducing reconnection time while ensuring reliable reconnection to the 5G network
2Loss of time
If the terminal actively initiates RRC connection re-establishment, then the reconnection time is reduced, but the device complexity increases
Solution Approach 1:
The terminal performs self-service by autonomously monitoring the service status of the secondary card and proactively initiating RRC connection re-establishment when needed. The terminal independently determines when to disconnect and re-establish connections without requiring complex network-side coordination or additional control mechanisms, thus reducing reconnection time while avoiding excessive device complexity
Data Source
AI summary
This specification relates to the field of mobile communications technologies, and specifically to a network access method and a terminal. The method is applied to a terminal that is connected to the primary access network device and the secondary access network device through the first SIM card, and is connected to the secondary access network device. The method includes: disconnecting, by the terminal, an RRC connection between the terminal and the secondary access network equipment when the terminal executes a first service through the second SIM card; determining, by the terminal, that the first service ends; and actively disconnecting, by the terminal, an RRC connection between the terminal and the primary access network equipment, and sending an RRC connection re-establishment request, so that the terminal is reconnected to the secondary access network equipment through the first SIM card with assistance of the primary access network equipment.