RF Channel Sharing for Fast Dual-SIM Service Switching
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Solution Overview
Problem
Dual-SIM dual active (DSDA) terminals experience slow switching times and service interruptions when switching data services between SIM cards due to the need for deregistration and registration procedures, as they require different radio frequency capabilities and complex channel switching.
Innovation Solution
A radio frequency channel sharing method where the terminal reports the same radio frequency capability upon registration and dynamically allocates resources, allowing seamless switching between SIM cards without initiating deregistration or registration procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the terminal uses different radio frequency capabilities for primary and secondary SIM cards, then the radio frequency circuit design complexity is reduced and terminal costs are reduced, but the switching time increases and service interruption occurs
Solution Approach 1:
The terminal pre-configures multiple radio frequency channels (first RF channel for primary SIM card, second RF channel for secondary SIM card) during initial setup. When switching between SIM cards, the terminal can immediately activate the pre-configured channel without needing to reconfigure or re-register, thus reducing switching time while maintaining different RF capabilities for each SIM card
Solution Approach 2:
The patent implements dynamic switching between different radio frequency channels based on which SIM card is active. The terminal can dynamically select and switch between the first RF channel and second RF channel without changing the underlying RF capabilities of each SIM card, allowing fast switching while maintaining simplified hardware design
2Reliability
If the terminal initiates deregistration and registration procedures when switching SIM cards, then the radio frequency capabilities are properly updated, but the switching speed decreases and service interruption occurs
Solution Approach 1:
The terminal performs capability reporting in advance for both SIM cards during initial network registration. The network side device stores the capability information for both SIM cards, so when switching occurs, the terminal can immediately use the pre-reported capabilities without initiating additional deregistration and registration procedures, ensuring both reliability and fast switching
3Loss of time
If the terminal configures separate radio frequency channels for each SIM card, then service switching can be performed without deregistration, but the hardware resources and costs increase
Solution Approach 1:
The terminal uses a shared radio frequency channel (fourth RF channel) that can serve both SIM cards when needed. Instead of requiring completely separate dedicated channels for each SIM card, the system implements a universal channel that can be dynamically allocated to either SIM card, reducing hardware resource requirements while still enabling fast switching without deregistration procedures
Data Source
AI summary
This application discloses methods and apparatuses for radio frequency channel sharing. An example method includes sending, by a terminal, first user equipment (UE) capability information to a network side device after receiving UE capability enquiry signaling that is sent by the network side device for a first subscriber identity module (SIM) card. The example method further includes sending, by the terminal, second UE capability information to the network side device after receiving UE capability enquiry signaling that is sent by the network side device for a second SIM card, wherein radio frequency capability information in the first UE capability information is the same as radio frequency capability information in the second UE capability information.