Multi-USIM WTRU Registration With Aggregate Challenge-Response

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Solution Overview

Problem

Wireless transmit/receive units (WTRUs) with multiple SIM cards face inefficient and resource-consuming registration and authentication procedures due to separate network registration and authentication processes for each SIM, leading to a high number of exchanged messages for security verification.

Innovation Solution

Implement optimized registration and authentication procedures for WTRUs with multiple USIMs, allowing a single registration and authentication procedure using aggregate challenge/response mechanisms and combined identifiers, reducing the need for separate procedures for each SIM.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If separate registration and authentication procedures are performed for each USIM, then security verification is ensured, but time consumption and resource consumption increase

Engineering Contradiction:

Improvesecurity verificationVSAvoidtime consumption

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent combines multiple separate registration and authentication procedures into a single unified procedure. The WTRU includes an indication that it is registering multiple USIMs, and the network performs authentication with an aggregate challenge/response that covers all USIMs simultaneously, eliminating the need for separate procedures for each SIM card.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The authentication procedure is designed to handle multiple USIMs universally within a single procedure. The network and WTRU use aggregate challenge/response mechanisms that can authenticate multiple subscriptions in one interaction, making the procedure multi-functional rather than requiring separate specialized procedures for each USIM.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Reliability

If separate registration and authentication procedures are performed for each USIM, then authentication completeness is ensured, but resource consumption increases

Engineering Contradiction:

Improveauthentication completenessVSAvoidresource consumption

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The patent merges multiple authentication procedures into one by using aggregate challenge/response mechanisms. The WTRU sends a single authentication request that includes indications for multiple USIMs, and the network responds with a single authentication response that validates all USIMs, significantly reducing the number of message exchanges and resource consumption.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent uses copied or referenced authentication data structures to handle multiple USIMs. Instead of creating completely separate authentication flows, the system uses aggregated authentication vectors and shared security contexts that can be reused across multiple USIMs, reducing the overall resource requirements while maintaining authentication completeness.

Inventive Principle:

Principle #26Copying

3Measurement precision

If separate registration procedures are performed for each USIM, then registration accuracy is ensured, but processing time increases

Engineering Contradiction:

Improveregistration accuracyVSAvoidprocessing speed

Core Design Contradiction:

Measurement precisionVSProductivity

Solution Approach 1:

The patent combines multiple registration procedures into a single registration process. The WTRU includes an indication in the registration request that it is registering multiple USIMs, and the network processes all registrations simultaneously in one procedure, improving processing speed while maintaining registration accuracy through proper handling of multiple identifiers and security contexts.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS12425867B2Registration and security enhancements for a WTRU with multiple USIMs

Publication Date: 2025.09.23 INTERDIGITAL PATENT HOLDINGS INC

AI summary

Methods and apparatuses are described herein for registration and security for wireless transmit/receive units (WTRUs) with multiple universal subscriber identity modules (USIMs). Optimized registration and authentication procedures, that enable a WTRU to register and authenticate multiple USIMs during one registration and authentication procedure are described herein. The techniques described herein may eliminate the need for separate registration and authentication procedures for each USIM. A gateway device may inform the network in a Registration Request message that it is registering multiple devices (i.e., multiple WTRUs). The network and the gateway may then perform an authentication procedure with an aggregate challenge/response (i.e., a single challenge for each WTRU). A WTRU may inform the network in a Registration Request message that it is registering multiple USIMs. The network and the WTRU may then perform an authentication procedure with an aggregate challenge/response (i.e., a single challenge for all USIMs).