Relay Discovery Security Verification in 5G ProSe Communication

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Solution Overview

Problem

The existing 5G ProSe discovery process lacks a reliable method to verify that the assigned security method is correctly used by user equipment, leading to potential security risks and inconsistencies in relay services.

Innovation Solution

A method and device for transmitting information that involves a discovery security management function to determine whether the assigned security method is used by the UE, utilizing relay discovery key requests and responses to ensure compatibility between the UE and the security management function, thereby reducing security risks and improving relay service security.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the existing 5G ProSe discovery process is used without verification mechanism, then the discovery process is simple and fast, but security risks increase and reliability decreases

Engineering Contradiction:

Improverelay service securityVSAvoiddiscovery process complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent introduces a verification mechanism where the network side sends a relay discovery key request to the UE and receives a relay discovery key response. This feedback loop allows the network to verify whether the UE correctly uses the assigned security method, thereby improving reliability without significantly complicating the overall discovery process.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent performs security method verification before allowing relay discovery communication to proceed. By checking whether the UE uses the assigned security method in advance (through the key request-response mechanism), the system prevents potential security issues before they can affect the relay service, thus improving reliability proactively.

Inventive Principle:

Principle #10Preliminary action

2Reliability

If security method assignment is implemented without verification, then the security framework is established, but inconsistencies and security risks remain

Engineering Contradiction:

Improvesecurity method consistencyVSAvoidsecurity method usage verification

Core Design Contradiction:

ReliabilityVSDifficulty of detecting and measuring

Solution Approach 1:

The patent establishes a feedback mechanism where the network side actively checks whether the UE correctly implements the assigned security method. The relay discovery key request and response provide a measurable way to detect security method usage consistency, transforming an unmeasurable security claim into a verifiable technical parameter.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent replaces abstract security assertions with concrete mechanical verification through key-based authentication. Instead of relying on vague security claims, the system uses tangible key exchange mechanisms (relay discovery key request/response) that can be detected, measured, and verified objectively.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Data Source

PatentUS20260052382A1Method and device for transmitting information, and communication device and storage medium

Publication Date: 2026.02.19 BEIJING XIAOMI MOBILE SOFTWARE CO LTD

AI summary

A method for transmitting information is provided. The method for transmitting information includes: a discovery security management function receiving a relay discovery key request transmitted by user equipment (UE) via a base station, where the relay discovery key request is used to request a relay discovery security parameter corresponding to relay discovery; and determining, based on the relay discovery key request, whether the UE uses a security method assigned to the UE.