PC5 QoS Flow Mapping Across ProSe WTRU Relay Links

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Solution Overview

Problem

Existing wireless transmit-receive units (WTRUs) cannot establish end-to-end quality of service (QoS) when communicating via WTRU-to-WTRU relays, as QoS management is limited to direct PC5 links and not supported across relayed communications.

Innovation Solution

Implement methods and apparatuses for end-to-end QoS management by establishing PC5 QoS flows between WTRUs through WTRU-to-WTRU relays, which forward packets based on PC5 QoS flow mappings and IP filters.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a WTRU communicates with a peer WTRU via a ProSe layer 3 WTRU-to-WTRU relay, then the communication range and connectivity are extended, but end-to-end QoS cannot be supported from WTRU to peer WTRU

Engineering Contradiction:

Improvecommunication connectivityVSAvoidend-to-end QoS

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The relay WTRU acts as an intermediary that establishes separate PC5 QoS flows with both the source WTRU and target WTRU. It performs QoS flow mapping between these links, translating QoS parameters and forwarding packets while maintaining end-to-end QoS requirements through the relay connection

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The end-to-end QoS flow is segmented into multiple segments: a first PC5 QoS flow between source WTRU and relay WTRU, and a second PC5 QoS flow between relay WTRU and target WTRU. Each segment is independently managed with its own QoS parameters, allowing QoS to be maintained across the relay path

Inventive Principle:

Principle #1Segmentation

2Reliability

If direct PC5 links are established between WTRUs for peer-to-peer communication, then QoS can be set up and managed between peers, but the communication range is limited to direct communication range

Engineering Contradiction:

ImproveQoS supportVSAvoidcommunication range

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The relay WTRU serves as a mediator that extends communication range by establishing PC5 links between WTRUs that are not in direct communication range. It maintains QoS support by managing separate PC5 QoS flows with each connected WTRU and performing appropriate flow mapping

Inventive Principle:

Principle #24Intermediary (Mediator)

3Adaptability or versatility

If a ProSe Layer-3 WTRU-to-WTRU Relay is implemented to enable communication beyond direct range, then communication versatility is improved, but QoS management complexity increases

Engineering Contradiction:

Improvecommunication rangeVSAvoidQoS flow management

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The relay WTRU implements QoS flow mapping functionality that automatically translates and maps QoS flows between different PC5 links. This intermediary function manages the complexity of QoS coordination across multiple links while maintaining end-to-end QoS requirements

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The relay WTRU performs multiple functions including packet forwarding, QoS flow mapping, and QoS parameter translation across different PC5 links. This multi-functionality consolidates QoS management complexity into a single device that handles all QoS coordination for relayed communications

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS12615541B2Methods and apparatuses for end-to-end quality of service for communication between wireless transmit-receive units

Publication Date: 2026.04.28 INTERDIGITAL PATENT HOLDINGS INC

AI summary

Methods and apparatuses are described herein for end-to-end Quality of Service, QoS, for communication between Wireless Transmit-Receive Units (WTRUs), via a ProSe WTRU-to-WTRU relay. PCS QoS flows are established respectively between a source WTRU and the ProSe WTRU-to-WTRU relay, and between a target WTRU and the ProSe WTRU-to-WTRU relay. The ProSe WTRU-to-WTRU relay performs PCS QoS flow mapping between the source and the target WTRU.