Multi-USIM UE Registration Under NAS Congestion Timers

Solution Overview

Problem

Existing systems face challenges with user experience delays and service disruptions when a UE with multi-USIM capability is located in a restricted service area, as it is restricted from initiating service request procedures, including setting or deleting paging restrictions, and is affected by NAS congestion due to timers like T3346 and T3447.

Innovation Solution

The UE with M-USIM capability is configured to disregard or block timers like BO (T3446) and SGC (T3447) if they are not related to MUSIM features, allowing it to perform registration and NAS procedures when in a non-allowed area, thereby enabling it to set or delete paging restrictions and manage congestion effectively.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the UE is restricted from initiating service request procedures in a non-allowed area to manage NAS congestion, then network congestion is reduced, but user experience delays and service disruptions occur

Engineering Contradiction:

ImproveNAS congestion managementVSAvoiduser experience delays

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent segments the service request procedure into two distinct paths: one for MUSIM-related procedures and another for non-MUSIM procedures. The UE determines whether a triggered service request is MUSIM-related based on specific criteria (MUSIM feature indication, MUSIM-specific information elements), and applies different handling rules accordingly. This segmentation allows MUSIM procedures to proceed even when congestion control timers are running, while non-MUSIM procedures remain restricted, thus resolving the contradiction between congestion management and user experience.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces dynamic behavior in the UE's service request handling by making the decision to ignore or respect congestion control timers conditional rather than static. The UE dynamically evaluates whether a service request is MUSIM-related and adjusts its behavior accordingly - ignoring timers like T3346 and T3447 for MUSIM procedures while respecting them for non-MUSIM procedures. This dynamic approach enables the system to adapt to different service requirements in real-time, resolving the contradiction between maintaining congestion control and allowing timely service delivery.

Inventive Principle:

Principle #15Dynamics

2Productivity

If the UE disregards timers like T3346 and T3447 for MUSIM procedures, then service continuity is improved, but network congestion control may be compromised

Engineering Contradiction:

Improveservice continuityVSAvoidcongestion control

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent segments the service request procedure into two distinct paths: one for MUSIM-related procedures and another for non-MUSIM procedures. The UE determines whether a triggered service request is MUSIM-related based on specific criteria (MUSIM feature indication, MUSIM-specific information elements), and applies different handling rules accordingly. This segmentation allows MUSIM procedures to proceed even when congestion control timers are running, while non-MUSIM procedures remain restricted, thus resolving the contradiction between congestion management and user experience.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies local quality by making congestion control timer handling specific to MUSIM-related procedures rather than applying a blanket rule to all service requests. The UE checks whether the triggered service request is MUSIM-related and selectively disregards congestion control timers only for these specific procedures. This localized approach ensures that service continuity is improved for MUSIM operations without compromising the overall congestion control mechanism for non-MUSIM procedures.

Inventive Principle:

Principle #3Local quality

3Adaptability or versatility

If the UE performs registration procedure in non-allowed area for MUSIM features, then service availability is enhanced, but network resource consumption increases

Engineering Contradiction:

Improveservice availabilityVSAvoidnetwork resource consumption

Core Design Contradiction:

Adaptability or versatilityVSUse of energy by moving object

Solution Approach 1:

The patent applies preliminary action by enabling the UE to perform registration procedures proactively in non-allowed areas when MUSIM-related service requests are triggered. Instead of waiting for network rejection or service failure, the UE anticipates the need for service and initiates registration beforehand, ensuring service availability for MUSIM features. This preliminary action prevents service disruptions while the selective application to only MUSIM procedures minimizes unnecessary network resource consumption.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS12538249B2Multi-USIM operation in user equipment

Publication Date: 2026.01.27 SAMSUNG ELECTRONICS CO LTD

AI summary

The disclosure relates to 5th generation (5G) and/or 6th generation (6G) communication system for supporting a higher data transmission rate. A method is provided of operating a user equipment (UE) with multi universal subscriber identity module (M-USIM) capability in a wireless communication system. The method includes performing a registration procedure with respect to a connected telecommunication network if the UE is in a non-allowed area and encounters or receives a trigger for a network access stratum (NAS) procedure related to an M-USIM feature.