Relay UE Power-Saving Modes for PC5-to-Uu Communication

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Solution Overview

Problem

The challenge of managing unused Uu links in remote UEs to balance power saving and latency in V2X communication, particularly when switching between PC5 and Uu links, leading to potential service continuity issues.

Innovation Solution

A method and device for establishing a PC5 connection with a relay UE to configure a power saving mode for Uu communication, allowing efficient power management while maintaining communication with a base station.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If the remote UE does not perform monitoring the Uu link to save power, then power saving is improved, but latency occurs when switching from PC5 link to Uu link

Engineering Contradiction:

Improvepower savingVSAvoidlatency

Core Design Contradiction:

Use of energy by moving objectVSLoss of time

Solution Approach 1:

The patent applies preliminary action by having the remote UE perform preliminary monitoring of the Uu link in a first power saving mode before actual communication needs arise. This allows the UE to have advance knowledge of network conditions and maintain readiness for quick switching between PC5 and Uu links, thereby reducing latency while still achieving significant power savings compared to continuous monitoring.

Inventive Principle:

Principle #10Preliminary action

2Reliability

If the remote UE performs monitoring the Uu link to avoid latency, then service continuity is improved, but power consumption increases

Engineering Contradiction:

Improveservice continuityVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent applies dynamics by implementing multiple power saving modes (first power saving mode with preliminary monitoring, second power saving mode with enhanced monitoring) that can be dynamically selected based on communication needs. The system transitions between different monitoring intensities to balance service continuity requirements with power consumption constraints, allowing flexible adaptation to varying operational conditions.

Inventive Principle:

Principle #15Dynamics

3Use of energy by moving object

If the remote UE configures enhanced power saving mode, then power efficiency is improved, but switching capability between links may be affected

Engineering Contradiction:

Improvepower efficiencyVSAvoidswitching capability

Core Design Contradiction:

Use of energy by moving objectVSAdaptability or versatility

Solution Approach 1:

The patent applies preliminary action by having the remote UE perform preliminary monitoring of the Uu link in advance of actual communication needs. This preliminary action enables the UE to maintain switching capability between PC5 and Uu links while operating in an enhanced power saving mode, as the preliminary monitoring keeps the UE informed of network conditions without requiring continuous active communication.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS12457649B2Method and device for performing communication on basis of power saving mode

Publication Date: 2025.10.28 LG ELECTRONICS INC

AI summary

Provided are a method for performing wireless communication by a first device, and a device supporting same. The method may comprise the steps of: establishing a radio resource control (RRC) connection with a base station; establishing a PC5 connection with a second device that relays communication between the first device and the base station; setting, on the basis of establishment of the PC5 connection with the second device, a power saving mode for saving power related to Uu communication between the base station and the first device; and performing communication with the base station on the basis of the power saving mode.