NR V2X Sidelink DRX Resource Selection for Low-Latency Transmission

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing wireless communication systems face challenges in efficiently managing sidelink (SL) communication for vehicle-to-everything (V2X) scenarios, particularly in terms of resource allocation and latency, which are critical for applications like vehicle platooning and advanced driving.

Innovation Solution

A method is proposed for determining a selection window and selecting SL resources based on an SL discontinuous reception (DRX) configuration to efficiently transmit sidelink control information (SCI) and data using physical sidelink channels, enabling efficient SL communication.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If SL DRX configuration is used to save power, then power consumption is reduced, but resource allocation efficiency and latency performance deteriorate

Engineering Contradiction:

Improvepower consumptionVSAvoidresource allocation efficiency

Core Design Contradiction:

Use of energy by moving objectVSProductivity

Solution Approach 1:

The patent applies preliminary action by having the transmitting UE perform channel sensing and resource selection in advance during the inactive time period. The UE determines a selection window and identifies candidate resources before the active time begins, so that when transmission occurs, the resource is already prepared and allocated, eliminating the need for real-time resource selection during active transmission time and thus reducing latency while maintaining power savings.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements dynamics by allowing the transmitting UE to flexibly determine the selection window based on the data transmission timing requirements. The selection window can be dynamically adjusted to include periods before and/or after the active time, enabling adaptive resource selection that balances power saving benefits with latency and reliability requirements for different V2X scenarios.

Inventive Principle:

Principle #15Dynamics

2Use of energy by moving object

If SL DRX configuration is used to save power, then power consumption is reduced, but transmission latency increases

Engineering Contradiction:

Improvepower consumptionVSAvoidtransmission latency

Core Design Contradiction:

Use of energy by moving objectVSLoss of time

Solution Approach 1:

The patent applies preliminary action by performing channel sensing and resource determination in advance during the inactive time period. The transmitting UE identifies the selection window and selects candidate resources before the active transmission time, so that when transmission occurs, the resource is already prepared. This eliminates the need for real-time resource selection during active time, significantly reducing transmission latency while maintaining the power saving benefits of DRX.

Inventive Principle:

Principle #10Preliminary action

3Speed

If resource selection is performed in active time only, then transmission speed is fast, but power consumption increases and resource collision risk increases

Engineering Contradiction:

Improvetransmission speedVSAvoidpower consumption

Core Design Contradiction:

SpeedVSUse of energy by moving object

Solution Approach 1:

The patent applies preliminary action by performing channel sensing and resource selection in the inactive time period before transmission occurs. The transmitting UE determines the selection window and identifies candidate resources in advance, so that when active time arrives, the resource is already prepared and allocated. This approach maintains fast transmission speed while significantly reducing power consumption, as the UE remains in low-power mode during the sensing and selection process.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements dynamics by allowing the transmitting UE to flexibly determine the selection window based on transmission requirements. The selection window can be dynamically adjusted to include periods before and/or after the active time, enabling adaptive resource selection that balances power saving benefits with transmission speed and collision avoidance for different V2X scenarios.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS12574994B2Operation method and device using non-activation period of SL DRX configuration in NR V2X

Publication Date: 2026.03.10 LG ELECTRONICS INC

AI summary

Proposed is an operation method of a first device (100) in a wireless communication system. The method comprises the steps of: determining a selection window related to data to be transmitted; selecting an SL resource within the selection window and an active time determined on the basis of a sidelink (SL) discontinuous reception (DRX) configuration; transmitting first sidelink control information (SCI) to a second device (100) through a first physical sidelink control channel (PSCCH) on the basis of the SL resource, the first SCI being SCI for scheduling a physical sidelink shared channel (PSSCH); and transmitting second SCI and the data to the second device (200) through the PSSCH on the basis of the SL resource.