SIM Initialization Logic for Multi-RAT Network Registration

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Solution Overview

Problem

Existing 4G SIM cards lack 5G profiles, leading to unnecessary network registration attempts, signaling overhead, registration delays, and reduced battery efficiency in 5G-capable user equipment due to failed 5G registration and inefficient use of globally unique temporary identifiers.

Innovation Solution

A system and method to read capability information from a UICC during SIM initialization, determining the UE's connectivity capabilities, and registering with either a 4G or 5G network based on subscription and profile information, disabling unnecessary device capabilities to reduce signaling and enhance registration efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the UE attempts to register with a 5G network using a traditional 4G SIM card, then the UE shows 5G capability, but the registration fails and causes unnecessary signaling overhead

Engineering Contradiction:

Improve5G capabilityVSAvoidsignaling overhead

Core Design Contradiction:

Adaptability or versatilityVSLoss of energy

Solution Approach 1:

The system performs preliminary detection of SIM card type and 5G profile presence before attempting network registration. This preliminary action prevents unnecessary 5G registration attempts when the SIM card does not support 5G, thereby avoiding the harmful signaling overhead while maintaining the ability to utilize 5G when appropriate.

Inventive Principle:

Principle #10Preliminary action

2Adaptability or versatility

If the UE continuously attempts 5G registration, then the UE maintains 5G capability, but the registration loop causes delays in 4G network registration

Engineering Contradiction:

Improve5G capabilityVSAvoidregistration delay

Core Design Contradiction:

Adaptability or versatilityVSLoss of time

Solution Approach 1:

The system performs preliminary detection of SIM card type and 5G profile presence before network registration attempts. This early detection prevents the formation of registration loops by identifying incompatible SIM cards upfront, allowing the UE to proceed directly to 4G registration without repeated failed 5G attempts, thus reducing registration delay.

Inventive Principle:

Principle #10Preliminary action

3Reliability

If the UE performs IMSI attach for every network rejection, then the UE maintains connection capability, but security is compromised due to repeated use of permanent identifiers

Engineering Contradiction:

Improveconnection capabilityVSAvoidsecurity risk

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The system performs preliminary detection of SIM card type and 5G profile presence before network registration. By identifying SIM card compatibility issues in advance, the system prevents repeated network rejections that would otherwise trigger repeated IMSI attach operations, thereby reducing security risks associated with repeated exposure of permanent identifiers while maintaining connection capability.

Inventive Principle:

Principle #10Preliminary action

4Reliability

If the UE disables 5G capabilities to use 4G SIM, then network registration succeeds, but the UE cannot utilize 5G networks when available

Engineering Contradiction:

Improvenetwork registrationVSAvoid5G network access

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The system dynamically adjusts 5G capability based on SIM card detection results. When a 4G-only SIM is detected, 5G capabilities are disabled to ensure successful registration. When a 5G-capable SIM is detected, 5G capabilities are enabled to allow utilization of 5G networks. This dynamic adjustment resolves the contradiction by making the capability adaptation contingent on the actual SIM card type.

Inventive Principle:

Principle #15Dynamics

5Productivity

If the UE performs unnecessary registration signaling, then the UE shows network activity, but battery efficiency is reduced due to extra signaling

Engineering Contradiction:

Improvenetwork activityVSAvoidbattery efficiency

Core Design Contradiction:

ProductivityVSUse of energy by moving object

Solution Approach 1:

The system performs preliminary detection of SIM card type and 5G profile presence before initiating network registration signaling. By identifying incompatible SIM cards in advance, the system prevents unnecessary registration signaling attempts, thereby conserving battery energy while maintaining essential network activity for successful registration.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS20250386184A1System and method to select multi-radio access technology in a user equipment during SIM initialization

Publication Date: 2025.12.18 JIO PLATFORMS LTD

AI summary

The present disclosure relates to a system and a method for selecting multi-radio access technology (RAT) in a user equipment (UE) during an initialization of subscriber identity module (SIM). The method includes reading capability information associated with the UE from a universal integrated circuit card (UICC) at the time of initializing the SIM, determining whether the UE includes a capability to connect to a first network having a first RAT based on the capability information, and registering the UE with the first network having the first RAT based on the UE capable of being connected to the first network.