R-UIM Card Reuse for HRPD Authentication via CAVE Algorithm

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Solution Overview

Problem

Current cdma2000/HRPD dual-mode terminals lack R-UIM cards that support simultaneous authentication for both networks, leading to waste and inefficiency when upgrading from cdma2000 to HRPD networks, as existing R-UIM cards are not compatible with HRPD network access authentication.

Innovation Solution

A cdma2000/HRPD dual-mode terminal design that reuses existing R-UIM cards by implementing the CAVE algorithm for HRPD network access authentication, utilizing a hardware structure including a radio module, dual-mode chip, R-UIM supporting CAVE, memory, LCD, and keyboard, allowing the R-UIM card to be separable and supporting both network authentication processes without modifying the HRPD network authentication flow.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If existing R-UIM cards are used for cdma2000 network authentication, then compatibility with current network is maintained, but they cannot perform authentication for HRPD network

Engineering Contradiction:

Improvenetwork authentication compatibilityVSAvoidauthentication function

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The R-UIM card is enhanced to support multiple authentication algorithms (CAVE for cdma2000 and MD5 for HRPD), transforming it from a single-function card to a multi-functional authentication device that can operate across different network types without requiring replacement

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Adaptability or versatility

If new R-UIM cards supporting both networks are developed, then dual-network authentication is enabled, but manufacturing cost and deployment complexity increase

Engineering Contradiction:

Improvedual-network authentication supportVSAvoidcard production and deployment

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The patent pre-loads multiple authentication algorithms (CAVE and MD5) into the R-UIM card during manufacturing, and pre-configures the terminal with both cdma2000 and HRPD network parameters. This preliminary preparation enables the card to immediately support both networks without requiring complex runtime configuration or multiple card deployments

Inventive Principle:

Principle #10Preliminary action

3Reliability

If separate R-UIM cards are used for cdma2000 and HRPD networks, then each network gets dedicated authentication capability, but device complexity and user burden increase

Engineering Contradiction:

Improvenetwork-specific authenticationVSAvoidmultiple R-UIM card management

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent merges the authentication functions for both cdma2000 and HRPD networks into a single R-UIM card by integrating multiple authentication algorithms (CAVE and MD5) within the same hardware device. The terminal automatically selects the appropriate algorithm based on the active network, eliminating the need for users to manage multiple separate cards

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS7649995B2Method and device for authenticating MS that has an R-UIM by using CAVE algorithm

Publication Date: 2010.01.19 SAMSUNG ELECTRONICS CO LTD

AI summary

A method and device for authenticating a MS has an R-UIM by using CAVE Algorithm are provided. The hardware structure of the device includes a cdma2000/HRPD dual-mode chip, a User Identity Module supporting the CAVE algorithm. The dual-mode terminal forms the NAI value with the domain name stored in a memory of the dual-mode terminal in advance by the IMSI. The dual-mode terminal extracts a RAND that is necessary for the calculation of an authentication parameter1 from the Random values included in a Chap Challenge message, instructs the R-UIM card to use the CAVE algorithm to calculate the authentication parameter1 with the RAND and an existing SSD_A in the R-UIM card, and bears the authentication parameter1 by the Result domain of a Chap Response message. With the present invention, the wastes caused by the replacement of R-UIM cards can be avoided.