VoLTE Device SIM Initialization for Reduced Camp Time
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Solution Overview
Problem
Wireless devices configured to use multiple cellular communication technologies face delays in camping on cellular networks due to the time required for multiple SIM applications to initialize, especially when one SIM application is ready before the network supports both data and voice communications.
Innovation Solution
The user equipment (UE) initializes the first SIM application and initiates camping on the cellular network with that RAT before the second SIM application is ready, if the network supports both data and voice communications via the first RAT, and waits or camps simultaneously with both RATs if the network does not support both.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE waits for all SIM applications to initialize before camping on the cellular network, then the reliability of cellular connectivity is improved, but the time to achieve connectivity deteriorates
Solution Approach 1:
The UE performs preliminary actions by initializing the first SIM application and camping on the cellular network before the second SIM application is fully ready. This allows the device to establish connectivity with the network using available SIM applications while the remaining applications continue to initialize in the background, thereby reducing the overall time to achieve cellular connectivity without compromising the reliability of the connection.
2Loss of time
If the UE camps on the cellular network with the first RAT before the second SIM application is ready, then the time to camp is reduced, but the device complexity increases due to managing multiple SIM applications with different readiness states
Solution Approach 1:
The UE implements a dynamic SIM application management system that continuously monitors the readiness state of multiple SIM applications and adapts the camping process accordingly. The system can dynamically switch between waiting for all applications to be ready and camping with partially initialized applications, based on network conditions and application readiness, thereby reducing time to camp while managing complexity through adaptive state-based decision making.
3Productivity
If the UE initializes multiple SIM applications simultaneously, then the productivity of the initialization process is improved, but the use of energy deteriorates due to concurrent processing of multiple applications
Solution Approach 1:
The UE performs preliminary initialization of the first SIM application independently and camps on the network before initializing the second SIM application. This sequential approach with overlapping operations allows the device to achieve connectivity with the first SIM application while the second application initializes in the background, improving overall initialization productivity while managing energy consumption by avoiding fully concurrent processing of all applications.
Data Source
AI summary
A user equipment (UE) may camp on a network following a SIM bootup. Specifically, the UE may determine that a SIM implementation module of the UE includes a first SIM application (e.g., USIM) associated with a first cellular radio access technology (RAT) (e.g., LTE) and a second SIM application (e.g., CSIM) associated with a second cellular RAT (e.g., CDMA). The UE may then initialize the first SIM application and the second SIM application. The UE may determine whether the network is configured to support both voice and data communications using the first cellular RAT. If so, the UE may initiate camping on the network with the first cellular RAT in response to determining that the first SIM application is ready, but before the second SIM application is ready. If not, the UE may wait until both the first and second SIM applications are ready before initiating camping on the network.