Sidelink Resource Reselection Around SL DRX Active Time

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Solution Overview

Problem

In sidelink communication, the transmitting UE often selects resources without considering the discontinuous reception (DRX) configuration of the receiving UE, leading to inefficient power consumption and increased signaling overhead due to non-compliant resource allocation.

Innovation Solution

The method involves determining sidelink grant resources based on the receiving UE's SL DRX configuration, triggering resource reselection if the allocated resources are not within the SL DRX active time, and ensuring that Physical Sidelink Control Channel (PSCCH) and Physical Sidelink Shared Channel (PSSCH) transmissions occur within the SL DRX active time.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the transmitting UE selects resources without considering the receiving UE's SL DRX configuration, then resource allocation flexibility is improved, but power consumption efficiency deteriorates

Engineering Contradiction:

Improveresource allocation flexibilityVSAvoidpower consumption efficiency

Core Design Contradiction:

Adaptability or versatilityVSUse of energy by moving object

Solution Approach 1:

The transmitting UE performs preliminary actions by determining the receiving UE's SL DRX configuration and predicting its active time before selecting resources. This allows the transmitting UE to proactively choose resources that fall within the receiving UE's active time, ensuring efficient power consumption while maintaining resource allocation flexibility.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The resource selection mechanism is made dynamic by adjusting resource selection based on the receiving UE's SL DRX state. The transmitting UE continuously monitors and adapts its resource selection to match the receiving UE's varying active and inactive periods, optimizing power consumption efficiency while preserving allocation flexibility.

Inventive Principle:

Principle #15Dynamics

2Ease of operation

If the transmitting UE selects resources without considering the receiving UE's SL DRX configuration, then resource selection simplicity is improved, but signaling overhead increases

Engineering Contradiction:

Improveresource selection simplicityVSAvoidsignaling overhead

Core Design Contradiction:

Ease of operationVSLoss of information

Solution Approach 1:

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

Inventive Principle:

Principle #15Dynamics

3Adaptability or versatility

If resource allocation does not align with SL DRX active time, then transmission independence is improved, but communication reliability deteriorates

Engineering Contradiction:

Improvetransmission independenceVSAvoidcommunication reliability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The transmitting UE utilizes feedback mechanisms by monitoring the receiving UE's SL DRX configuration and active time indications. This feedback allows the transmitting UE to adjust its resource selection to ensure transmissions occur during the receiving UE's active time, thereby maintaining transmission independence while significantly improving communication reliability.

Inventive Principle:

Principle #23Feedback

4Reliability

If the transmitting UE continuously monitors PSCCH without DRX operation, then reception completeness is improved, but power consumption increases

Engineering Contradiction:

Improvereception completenessVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The receiving UE implements periodic action through SL DRX operation, where it alternates between active and inactive states. During active time, the UE monitors PSCCH for transmissions; during inactive time, it suspends monitoring to save power. The transmitting UE aligns its transmissions with these periodic active periods, ensuring reception completeness while dramatically reducing power consumption.

Inventive Principle:

Principle #19Periodic action

Data Source

PatentUS12526772B2Method and apparatus for transmitting and receiving sidelink data in a wireless communication system

Publication Date: 2026.01.13 LG ELECTRONICS INC

AI summary

A method for a first user equipment (UE) to perform sidelink communication in a wireless communication system according to an embodiment of the present disclosure, the method comprises creating a sidelink grant related to resource allocation mode 2, transmitting, to a second UE, the PSCCH and transmitting, to the second UE, the PSSCH. Based on 1) the second UE behaving based on a SideLink Discontinuous Reception (SL DRX) configuration, and 2) the at least one duration related to the PSCCH and a second stage SCI related to the PSSCH, for transmission of a Medium Access Control Protocol Data Unit (MAC PDU) which is based on the sidelink grant, not being in a SL DRX active time of the second UE: a reselection of the resource based on the resource allocation mode 2 is triggered.