5G ProSe Service Discovery Without Core Network Interaction

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Solution Overview

Problem

In the 5G System (5GS), wireless devices lack the ability to discover services of interest without interacting with a ProSe function in the core network, while ensuring service privacy.

Innovation Solution

Wireless transmit/receive units (WTRUs) are provisioned with service-specific discovery types and security credentials, enabling direct communication through PC5 discovery messages and responses, with verification of security elements to authorize communication links.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If WTRUs interact with a ProSe function in the core network for service discovery, then service discovery capability is improved, but network dependency and complexity increase

Engineering Contradiction:

Improveservice discovery capabilityVSAvoidnetwork dependency

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent extracts the service discovery functionality from the core network's ProSe function and implements it directly in the WTRU device. The WTRU now generates and verifies discovery codes locally using stored service information, eliminating the need for continuous interaction with the core network's discovery function while maintaining service discovery capability.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The WTRU performs self-service by autonomously generating discovery codes for services it provides and verifying discovery codes from other WTRUs using pre-stored service information. This self-contained approach enables service discovery without requiring external ProSe function assistance, reducing network dependency.

Inventive Principle:

Principle #25Self-service

2Device complexity

If WTRUs perform direct service discovery without core network interaction, then network dependency is reduced, but security verification capability may be compromised

Engineering Contradiction:

Improvenetwork dependencyVSAvoidsecurity verification

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The WTRU performs preliminary actions by pre-storing service information including service identities and associated security credentials in its local memory before engaging in direct discovery. This advance preparation enables the WTRU to securely verify discovery codes from other devices without real-time network assistance, maintaining security verification capability while reducing network dependency.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS20250280274A15g prose service based discovery

Publication Date: 2025.09.04 INTERDIGITAL PATENT HOLDINGS INC

AI summary

Methods and apparatuses are described herein for proximity-based services (ProSe) service-based discovery. For example, a service utilizing-wireless transmit/receive unit (SU-WTRU) may be provisioned with a type of discovery on a per-service basis and a security credential on a per-service basis. The SU-WTRU may transmit a PC5 discovery message with the type of discovery and a first security element that is generated based on the security credential. The WTRU may then receive, from a service providing-wireless transmit/receive unit (SP-WTRU), a PC5 discovery response message that includes a second security element and a service identity associated with a service that the SP-WTRU provides.