Relay UE Context Transfer for Seamless Uu-PC5 Path Switching

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Solution Overview

Problem

Existing wireless communication systems face challenges in ensuring session continuity during direct path switches between Uu and PC5 connections, particularly when switching between a Uu connection with a base station and a PC5 connection with another UE, as existing 5G ProSe sidelink communication mechanisms do not guarantee seamless transitions.

Innovation Solution

The implementation of a relay UE to assist in switching between Uu and PC5 connections by providing context information and QoS mapping relationships, ensuring smooth and stable transitions through the relay UE's Uu and PC5 connections.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If direct path switch between Uu and PC5 connections is implemented, then communication path flexibility is improved, but session continuity is worsened

Engineering Contradiction:

Improvecommunication path flexibilityVSAvoidsession continuity

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent introduces a relay UE as an intermediary device to facilitate the path switch between Uu and PC5 connections. The relay UE receives context information from the target UE and provides QoS mapping relationships, acting as a mediator that ensures session continuity during the switching process without requiring direct connection between the remote UE and base station

Inventive Principle:

Principle #24Intermediary (Mediator)

2Speed

If path switch strategy is implemented without relay assistance, then switching speed is improved, but communication stability is worsened

Engineering Contradiction:

Improveswitching speedVSAvoidcommunication stability

Core Design Contradiction:

SpeedVSStability of the object's composition

Solution Approach 1:

The patent implements preliminary action by having the target UE send context information to the relay UE before the actual path switch occurs. The relay UE prepares and provides QoS mapping relationships in advance, ensuring that when the switch is executed, the communication parameters are already prepared and matched, thereby maintaining communication stability while achieving fast switching

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS20250365791A1Electronic device and method used for wireless communication, and computer-readable storage medium

Publication Date: 2025.11.27 SONY GROUP CORP

AI summary

An electronic device includes: a processing circuit configured to: based on received first information, determine that a first user equipment is a relay device between a base station and a second user equipment, wherein the first user equipment can establish a Uu connection with the base station and can establish a PC5 connection with the second user equipment, and a Uu communication between a third user equipment and base station and a PC5 communication between the third user equipment and the second user equipment will be switched; and providing base station or second user equipment with context information of communication before switching, and information of a QoS mapping relationship between the communication before switching and communication after switching, the communication before switching is one of the Uu communication and the PC5 communication, and the communication after switching is the other one of the Uu communication and the PC5 communication.