Peer SIM Registration Sharing for Faster 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 network registration procedures across multiple SIMs, leading to increased service interruption and reduced efficiency, especially in scenarios of network congestion, lower coverage, and network failures.
Innovation Solution
Implementing a method where network registration information is shared between peer SIM stacks, allowing one stack to adapt network registration procedures based on information from another stack, such as back-off timer termination and recovery timer cancellation, to optimize network registration and reduce service interruptions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If each software stack performs independent network registration procedures on multiple SIMs, then each stack can maintain autonomous connectivity management, but recovery time from network failures increases and service interruption is prolonged
Solution Approach 1:
The patent merges the network registration procedures of multiple independent software stacks by introducing a shared mobility management entity. When one stack successfully registers with the network, this registration information is shared with other stacks, allowing them to skip redundant registration attempts and reduce recovery time while maintaining autonomous connectivity management for each SIM.
Solution Approach 2:
The patent introduces a mobility management entity as an intermediary between multiple software stacks and the network. This intermediary coordinates registration procedures across stacks, sharing success information and back-off timer states to prevent redundant failed attempts and accelerate recovery without compromising individual stack autonomy.
2Adaptability or versatility
If multiple SIMs perform simultaneous network registration procedures, then each SIM can establish independent connectivity, but service interruption time increases due to repeated procedures
Solution Approach 1:
The patent implements preliminary action by having software stacks share network registration results before other stacks attempt the same procedures. When one stack successfully registers, this success is communicated to other stacks in advance, allowing them to skip redundant registration steps and reduce overall service interruption time while maintaining independent connectivity capability.
Solution Approach 2:
The patent establishes feedback mechanisms where software stacks communicate registration success and failure states to each other. This feedback allows subsequent stacks to adjust their registration procedures based on prior outcomes, avoiding redundant attempts and reducing service interruption duration while preserving independent connectivity for each SIM.
3Ease of operation
If each software stack independently handles network failures with back-off timers, then each stack maintains autonomous failure recovery, but overall recovery time is prolonged
Solution Approach 1:
The patent introduces a universal mobility management entity that serves multiple software stacks simultaneously. This entity coordinates back-off timer management across stacks, allowing successful registration information from one stack to benefit other stacks, thereby reducing overall recovery time while each stack maintains its autonomous failure recovery capability through the shared coordination mechanism.
Data Source
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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.