NR V2X Resource Re-Evaluation for Event-Triggered Sidelink Allocation

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Solution Overview

Problem

Existing wireless communication systems face challenges in efficiently managing resource allocation and re-evaluation for vehicle-to-everything (V2X) communication, particularly in next-generation radio access technologies like NR, which are crucial for supporting enhanced mobile broadband, massive Machine Type Communication, and Ultra-Reliable and Low Latency Communication.

Innovation Solution

A method is proposed for a first device to select and re-evaluate resources within a selection window, transmit sidelink control information, and then communicate using a physical sidelink shared channel to efficiently perform V2X communication, including resource reservation and MAC protocol data unit transmission.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If resource re-evaluation is performed frequently to improve reliability of V2X communication, then communication reliability is improved, but signaling overhead and processing complexity increase

Engineering Contradiction:

Improvecommunication reliabilityVSAvoidprocessing complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent changes the parameter of resource re-evaluation from continuous/frequent operations to event-triggered operations based on specific conditions (resource status changes, interference detection, channel quality variations). This parameter change maintains reliability by performing re-evaluation only when necessary while reducing processing complexity by avoiding unnecessary re-evaluation operations.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The system performs self-service through autonomous resource re-evaluation based on pre-defined triggers and conditions. The first device automatically monitors resource status, detects changes, and initiates re-evaluation without external intervention, reducing the need for complex centralized control while maintaining communication reliability.

Inventive Principle:

Principle #25Self-service

2Adaptability or versatility

If resource selection window is enlarged to provide more resource options, then resource allocation flexibility is improved, but resource selection complexity and latency increase

Engineering Contradiction:

Improveresource allocation flexibilityVSAvoidresource selection latency

Core Design Contradiction:

Adaptability or versatilityVSLoss of time

Solution Approach 1:

The patent segments the resource selection process into multiple stages: initial resource selection from a larger window, followed by re-evaluation from a smaller focused window when triggers are detected. This segmentation provides flexibility through the initial large window while reducing latency in subsequent selections by narrowing the search scope based on accumulated channel knowledge and trigger conditions.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system performs preliminary resource selection and sensing actions in advance, establishing a pool of candidate resources before actual transmission needs arise. This preliminary action enables faster resource selection when needed, as the device already has pre-evaluated candidate resources ready, reducing selection latency while maintaining flexibility through the pre-established candidate pool.

Inventive Principle:

Principle #10Preliminary action

3Productivity

If sensing and resource selection procedure is performed continuously to optimize resource allocation, then resource allocation efficiency is improved, but energy consumption and processing load increase

Engineering Contradiction:

Improveresource allocation efficiencyVSAvoidenergy consumption

Core Design Contradiction:

ProductivityVSUse of energy by moving object

Solution Approach 1:

The patent implements periodic resource re-evaluation triggered by specific events (resource status changes, interference detection, channel quality variations) rather than continuous monitoring. This periodic action maintains resource allocation efficiency by re-evaluating resources at optimal intervals based on actual channel conditions while significantly reducing energy consumption compared to continuous sensing and selection procedures.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The system employs feedback mechanisms where the outcome of previous resource selections and channel conditions are used to trigger subsequent re-evaluation operations. This feedback-driven approach optimizes resource allocation efficiency by learning from past selections and only re-evaluating when feedback indicates potential improvements, while reducing energy consumption by avoiding redundant sensing and processing operations.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS12452889B2Method and apparatus for performing resource re-evaluation operation in NR V2X

Publication Date: 2025.10.21 LG ELECTRONICS INC

AI summary

Proposed is a method for operation of a first apparatus (100) in a wireless communication system. The method may comprise the steps of: selecting a first resource and a third resource within a selection window, on the basis of a sensing and resource selection procedure; performing re-evaluation related to the first resource, on the basis of triggering of the re-evaluation related to the first resource; selecting a second resource on the basis of the re-evaluation related to the first resource; transmitting, to a second apparatus (200) via a physical sidelink control channel (PSCCH), sidelink control information (SCI) including a first value related to a resource reservation period of the second resource, on the basis of the second resource; and transmitting a medium access control (MAC) protocol data unit (PDU) to the second apparatus (200) via a physical sidelink shared channel (PSSCH), on the basis of the second resource.