Terminal Identity Verification Request Comparison

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Solution Overview

Problem

Existing solutions fail to effectively reduce call drop rates during the identity verification and authentication stage in mobile communication networks, particularly due to misjudgment in synchronization failure between the network and terminal.

Innovation Solution

A method that involves receiving identity verification requests and responses, comparing them to prevent misjudgment, and using authentication tuples to directly reuse successful verification responses, thereby avoiding unnecessary call drops.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the terminal uses traditional identity verification methods with T3320 timer, then the verification process follows standard protocol, but call drops occur due to misjudgment of synchronization failure

Engineering Contradiction:

Improvecall drop rateVSAvoididentity verification complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The terminal performs preliminary comparison of identity verification requests before executing the verification process. By comparing the current verification request with previously received requests, the terminal can identify duplicate requests and avoid redundant verification operations that lead to call drops. This preliminary action prevents the T3320 timer from triggering unnecessary call drop procedures.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The terminal creates and stores copies of received identity verification requests in memory. These stored copies serve as reference data for comparing against future verification requests. By maintaining these copies, the terminal can quickly identify duplicate requests without re-executing the full verification process, thereby preventing synchronization failure misjudgments.

Inventive Principle:

Principle #26Copying

2Reliability

If the core network retransmits identity verification requests after T3360 timer expires, then network reliability is improved, but terminal misjudges synchronization failure causing call drops

Engineering Contradiction:

Improvenetwork verification reliabilityVSAvoidverification state information

Core Design Contradiction:

ReliabilityVSLoss of information

Solution Approach 1:

The terminal implements a feedback mechanism that monitors the status of identity verification requests throughout the process. By tracking whether verification requests have been received, sent, and their outcomes, the terminal can provide accurate feedback to the network and avoid misjudging synchronization failures. This feedback loop ensures that retransmitted requests are properly recognized and handled.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The terminal performs preliminary comparison of incoming verification requests against stored historical requests before processing them. This preliminary action preserves verification state information by identifying that a retransmitted request is actually a duplicate, preventing the loss of verification state information that would otherwise lead to synchronization failure misjudgments.

Inventive Principle:

Principle #10Preliminary action

3Loss of time

If the terminal starts T3320 timer after authentication failure, then the timer provides timeout protection, but it causes call drops when verification requests are duplicated

Engineering Contradiction:

Improveverification timeout controlVSAvoidcall service continuity

Core Design Contradiction:

Loss of timeVSReliability

Solution Approach 1:

The terminal applies preliminary anti-action by comparing incoming verification requests against stored copies before the T3320 timer can trigger a call drop. By identifying duplicate requests in advance and preventing their processing, the terminal counteracts the potential harmful effect of the timer expiration. This preliminary protective action ensures that the T3320 timer does not cause unnecessary call drops due to duplicated verification requests.

Inventive Principle:

Principle #9Preliminary anti-action

Data Source

PatentEP4340422B1Method for reducing call drop rate and terminal

Publication Date: 2025.06.04 HONOR DEVICE CO LTD

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AI summary

This application provides a call drop rate reduction method and a terminal. In this method, there is no need to make any changes to the core network, the base station, and the USIM. The core network performs identity verification with the terminal according to the normal process, and when the terminal receives the second identity verification request after the initial identity verification and authentication, the terminal compares the first identity verification request received during the initial identity verification with the second identity verification request, after determining that the second identity verification and authentication fails, the terminal monitors a direction of the call service within the timing duration corresponding to the T3320 timer, and when it is determined that the call service is redirected to success, the terminal automatically stops the T3320 timer to prevent the terminal from automatically executing the call drop process after the T3320 timer expires, thereby effectively avoiding misjudgment in the identity verification and authentication stage, and solving the problem of a call drop caused by misjudgment in the identity verification and authentication stage in existing user scenarios, which reduces the call drop rate and improves user experience.