Peer SIM Registration Sharing During NAS Failure Recovery
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Solution Overview
Problem
Multi-SIM user equipment (UE) devices experience prolonged recovery times and service interruptions due to repeated procedures across multiple SIMs during network failures, such as congestion, lower coverage, and network unavailability, leading to inefficient network registration and reliability issues.
Innovation Solution
Implementing a method where network registration information is shared between peer SIM stacks to optimize network registration, including sharing registration reject and success information to adjust back-off and recovery timers, and enabling stacks to skip redundant procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple SIMs perform independent network registration procedures separately, then each SIM maintains its own connection management, but recovery time from network failures increases and service interruption is prolonged
Solution Approach 1:
The patent merges network registration information across multiple SIM stacks by implementing a shared failure information database. When one SIM stack experiences network failure, the failure information (including back-off timer values and reject causes) is shared with other SIM stacks, allowing them to skip redundant registration attempts and procedures, thereby reducing overall recovery time while maintaining independent connection management for each SIM.
Solution Approach 2:
The patent implements a feedback mechanism where network failure information, registration reject causes, and back-off timer status from one SIM stack are fed back to other SIM stacks. This feedback allows peer SIMs to adjust their registration behavior based on the network conditions experienced by other SIMs, optimizing recovery timing and reducing service interruption.
2Ease of operation
If each software stack repeats the same registration procedure independently, then each stack maintains autonomous operation, but service interruption is prolonged due to redundant procedures
Solution Approach 1:
The patent implements preliminary action by having SIM stacks share network failure information and back-off timer status before other stacks initiate their registration procedures. When one SIM stack receives a network reject, this information is proactively shared with peer stacks, allowing them to preemptively adjust their registration timing and avoid redundant failed attempts, thus reducing service interruption while preserving autonomous operation.
3Reliability
If back-off timers are enforced independently on each SIM stack, then each SIM follows network protocols separately, but recovery time is extended when network conditions improve for one SIM but not others
Solution Approach 1:
The patent uses feedback to share back-off timer information across SIM stacks. When one SIM stack experiences network rejection with a back-off timer, this timer information is shared with peer stacks. If the network condition improves for one SIM (timer expires or network accepts connection), this positive feedback is shared with other SIMs, allowing them to提前 resume registration attempts even before their individual timers would expire, thus reducing recovery time while maintaining protocol compliance.
Solution Approach 2:
The patent implements a universal back-off timer management mechanism that serves all SIM stacks simultaneously. The shared failure information database and inter-stack communication protocol allow the back-off timer system to function universally across multiple SIMs, enabling coordinated recovery behavior that respects network protocols while optimizing overall service restoration time for all SIMs.
Data Source
AI summary
Disclosed herein is a method for network registration in a multi-Subscriber Identity Module (SIM) User Equipment (UE), the multi-SIM UE including a first SIM and at least one second SIM, the first SIM and the at least one second SIM being connected to a common network, and the method including sending network registration information to a first stack associated with the first SIM by at least one second stack associated with the at least one second SIM, and adapting, by the first stack, a network registration using the network registration information.