Sidelink DRX Channel Sensing for Flexible V2X Resource Allocation

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 services requiring high reliability and low latency.

Innovation Solution

A method is proposed for determining a sensing window and a selection window within an SL discontinuous reception (DRX) configuration to efficiently select SL resources for transmitting sidelink control information and data, using physical sidelink channels.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If SL DRX configuration is used to reduce power consumption, then energy efficiency is improved, but resource allocation flexibility deteriorates

Engineering Contradiction:

Improvepower consumptionVSAvoidresource allocation flexibility

Core Design Contradiction:

Use of energy by moving objectVSAdaptability or versatility

Solution Approach 1:

The SL DRX configuration is segmented into multiple active times within a single DRX cycle, allowing the UE to perform sensing and resource selection in different time segments. This segmentation enables the UE to maintain power savings while having multiple opportunities for resource allocation, thus resolving the contradiction between energy efficiency and resource allocation flexibility.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system dynamically adapts resource allocation within the constraints of SL DRX by allowing multiple active times and flexible sensing/selection window configurations. This dynamic approach enables the UE to adjust its resource selection strategy based on traffic requirements while maintaining power-efficient DRX operation, balancing energy savings with allocation flexibility.

Inventive Principle:

Principle #15Dynamics

2Productivity

If sensing window and selection window are determined within SL DRX configuration, then resource allocation efficiency is improved, but latency increases

Engineering Contradiction:

Improveresource allocation efficiencyVSAvoidlatency

Core Design Contradiction:

ProductivityVSLoss of time

Solution Approach 1:

The UE performs sensing in a first active time that may be shorter or partial compared to traditional continuous sensing, and then completes resource selection in a subsequent active time. This partial action approach improves resource allocation efficiency by distributing the sensing and selection process across multiple active times, while the total time remains controlled to prevent excessive latency.

Inventive Principle:

Principle #16Partial or excessive action

Solution Approach 2:

The sensing window is configured to end before the selection window begins, allowing the UE to complete sensing preparations in advance during the first active time. This preliminary action enables the UE to have sensing results ready before the selection window opens in the second active time, improving allocation efficiency while managing latency through proper timing coordination.

Inventive Principle:

Principle #10Preliminary action

3Adaptability or versatility

If multiple active times are configured in SL DRX, then resource selection opportunities are improved, but device complexity increases

Engineering Contradiction:

Improveresource selection opportunitiesVSAvoidconfiguration complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The SL DRX configuration uses universal parameters (drx-OnDurationTimer, drx-InactivityTimer, drx-RetransmissionTimer, drx-LongCycleStartOffset) that serve multiple functions: defining active times for both sensing and resource selection operations. This multi-functionality allows the system to provide multiple resource selection opportunities without requiring separate configuration sets, thus reducing device complexity while maintaining versatility.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The system manages complexity by controlling the number and duration of active times through parameter adjustments rather than creating entirely separate configuration structures. By modifying existing SL DRX parameters to support multiple active times within cycles, the system increases resource selection opportunities while keeping configuration complexity manageable through parameter-based control.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS12439473B2Method and device for channel sensing and resource allocation for SL DRX

Publication Date: 2025.10.07 LG ELECTRONICS INC

AI summary

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