SoR Security Check Timer for 5G UE Deregistration

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Solution Overview

Problem

In wireless networks, User Equipment (UE) faces challenges in handling Steering of Roaming (SoR) security check failures, leading to potential malicious behavior by Virtual Public Land Mobile Networks (VPLMNs) that corrupt SoR information to maintain revenue by keeping UE in connected mode, impacting service quality and revenue distribution between HPLMNs and VPLMNs.

Innovation Solution

Implementing a 'SoR security check timer' configured by the Home Public Land Mobile Network (HPLMN) in UE, which initiates a deregistration procedure and PLMN selection when the security check fails, ensuring UE releases NAS signaling connections and switches to higher priority networks, thereby preventing malicious behavior by VPLMNs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of energy

If VPLMN keeps UE in connected mode to maintain revenue, then VPLMN revenue is improved, but service quality and network security deteriorate

Engineering Contradiction:

ImproveVPLMN revenueVSAvoidservice quality

Core Design Contradiction:

Loss of energyVSReliability

Solution Approach 1:

The UE performs a security check on SOR information in advance before fully establishing connected mode. The timer mechanism is pre-configured to automatically trigger deregistration if security checks fail, preventing malicious VPLMNs from maintaining harmful connected states without requiring real-time intervention.

Inventive Principle:

Principle #10Preliminary action

2Reliability

If UE performs security check on SOR information, then network security is improved, but connection stability deteriorates

Engineering Contradiction:

Improvenetwork securityVSAvoidconnection stability

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The invention introduces a timer parameter that dynamically controls the connection state. When security checks fail, the timer expires and automatically triggers state transition from connected to deregistered, providing a quantitative mechanism to balance security requirements with connection stability without manual intervention.

Inventive Principle:

Principle #35Parameter changes

3Loss of energy

If VPLMN corrupts SOR information, then VPLMN revenue is maintained, but UE independence and service quality deteriorate

Engineering Contradiction:

ImproveVPLMN revenueVSAvoidUE independence

Core Design Contradiction:

Loss of energyVSAdaptability or versatility

Solution Approach 1:

The UE implements a feedback mechanism where security check results directly control the timer behavior. If SOR information security checks fail, the timer expires and triggers automatic deregistration, creating a closed-loop system that prevents corrupted information from maintaining harmful connected states and ensures UE independence.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS20240205687A1Apparatus and method for handling SOR security check failure in connected mode of UE in wireless network

Publication Date: 2024.06.20 SAMSUNG ELECTRONICS CO LTD

AI summary

The present disclosure relates to a 5G communication system or a 6G communication system for supporting higher data rates beyond a 4G communication system such as long term evolution (LTE).