Sidelink L3 Relay Paging Modes for Reliable Low-Power UE Reachability

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Solution Overview

Problem

There is a need for improved sidelink communications in wireless networks, particularly in sidelink layer 3 (L3) relay systems, to enhance communication efficiency and reduce power consumption in remote UEs that are out of network coverage.

Innovation Solution

The method involves connecting a remote UE to a relay UE via a sidelink, receiving configuration information for paging modes, and monitoring for paging from the network entity based on the identified mode, with the relay UE forwarding paging information when necessary.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If remote UE monitors paging directly from network entity, then paging reliability is improved, but power consumption increases

Engineering Contradiction:

Improvepaging reliabilityVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The relay UE acts as an intermediary between the network entity and the remote UE. The relay UE receives paging messages from the network entity and forwards them to the remote UE via sidelink communication. This allows the remote UE to be paged reliably through the relay while the remote UE itself does not need to continuously monitor the network's paging channel, thereby reducing its power consumption.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If remote UE connects to relay UE via sidelink, then coverage extension is improved, but communication complexity increases

Engineering Contradiction:

Improvecoverage extensionVSAvoidcommunication complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The communication system is segmented into different functional parts: the network entity maintains core network connectivity, the relay UE handles sidelink communication and paging forwarding, and the remote UE focuses on receiving forwarded paging messages. This segmentation allows each component to perform its specific function efficiently, extending coverage to remote UEs while managing overall system complexity through clear role division.

Inventive Principle:

Principle #1Segmentation

3Reliability

If relay UE forwards all paging messages, then paging completeness is improved, but sidelink traffic load increases

Engineering Contradiction:

Improvepaging completenessVSAvoidsidelink traffic load

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The relay UE does not need to forward all paging messages to the remote UE. Instead, it forwards only those paging messages that are relevant to the remote UE, determined by matching paging identifiers. This partial action approach ensures paging completeness for the remote UE while avoiding unnecessary traffic load on the sidelink by filtering out irrelevant paging messages.

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS12568466B2Paging in sidelink layer 3 relay systems

Publication Date: 2026.03.03 QUALCOMM INC

AI summary

Certain aspects of the present disclosure provide techniques for paging in sidelink L2 relay scenarios. An example method generally includes connecting, via a sidelink, to a relay user equipment (UE) connected to a network entity; receiving, from a network entity via the relay UE, configuration information identifying a paging mode for the remote UE; and monitoring for paging from the network entity, in accordance with the identified paging mode.