Dual SIM Terminal Emergency Callback Handling
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Solution Overview
Problem
Dual SIM terminals face issues with user experience due to paging conflicts and inadequate inter-network negotiation, leading to suboptimal performance in emergency callback scenarios.
Innovation Solution
Implementing a method where a dual SIM terminal waits for a specified time period after an emergency call ends before detaching the secondary card or suspending its RRC connection, to handle potential emergency callbacks and optimize user experience by ensuring seamless service switching between primary and secondary cards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the terminal immediately returns to the primary card after an emergency call ends, then the service switching speed is improved, but the reliability of emergency callback is deteriorated
Solution Approach 1:
The terminal performs preliminary actions by waiting for a configured time period after the emergency call ends before returning to the primary card. This preliminary waiting period ensures that if an emergency callback is needed, the secondary card remains active and can receive the callback, thus resolving the contradiction between fast service switching and reliable emergency callback handling
2Reliability
If the terminal waits for a time period after emergency call ends, then the emergency callback reliability is improved, but the service switching speed is deteriorated
Solution Approach 1:
The terminal performs a preliminary wait for a configured time period after emergency call termination. This preliminary action balances reliability and speed by keeping the secondary card active only long enough to catch emergency callbacks, then quickly switching back to the primary card for normal service
Solution Approach 2:
The terminal changes the operational state of the secondary card based on time parameters. By adjusting the waiting time period parameter, the system optimizes the balance between maintaining emergency callback capability and enabling fast service switching, thus resolving the contradiction
3Adaptability or versatility
If the terminal uses dual SIM card mode, then the adaptability and service coverage are improved, but the paging conflict and inter-network negotiation issues are deteriorated
Solution Approach 1:
The terminal performs preliminary actions by proactively managing the secondary card's state before paging conflicts can occur. By controlling when the secondary card remains active versus when it switches to primary card mode, the system prevents inter-network negotiation issues while maintaining dual SIM adaptability
Solution Approach 2:
The terminal dynamically adjusts the operational state of SIM cards based on service conditions. The system transitions from static dual SIM operation to dynamic card state management, where the secondary card's active state changes based on timing and service requirements, thereby reducing paging conflicts while maintaining service coverage
Data Source
AI summary
Embodiments of the present disclosure provide a method for service optimization and a communications device. The method for service optimization applied to a first communications device includes: performing a waiting-related operation before performing a first operation, where the waiting-related operation is any one of the following: an operation of waiting for a first time period; an operation, before the first time period is overrun, when a first condition is satisfied, of stopping waiting for the first time period; and an operation of waiting for an incoming call, where the first time period is a time period starting from a time point at which an emergency service is ended.