NR V2X Sidelink Resource Allocation for CG-DG Collision Avoidance

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Solution Overview

Problem

In wireless communication systems, particularly in V2X scenarios, the dynamic grant (DG) and configured grant (CG) resource allocation schemes can result in timing and location collisions, leading to inefficiencies in resource management and transmission operations for user equipment (UEs).

Innovation Solution

A method and device for performing sidelink (SL) communication, where a UE receives information related to CG and DG resources, and performs initial SL transmissions based on overlapping resources in the time domain, while avoiding retransmissions on conflicting resources.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If both CG and DG resources are allocated to a UE, then resource allocation flexibility is improved, but resource collision and timing conflicts occur

Engineering Contradiction:

Improveresource allocation flexibilityVSAvoidtransmission reliability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The base station performs preliminary actions by first allocating CG resources through RRC signaling, then subsequently allocating DG resources through DCI. This sequential preliminary allocation allows the UE to have both reserved and dynamic resources available, improving flexibility while the base station coordinates timing to prevent collisions between the two resource types.

Inventive Principle:

Principle #10Preliminary action

2Stability of the object's composition

If CG resources are allocated through RRC signaling, then resource reservation is improved, but timing coordination with DG resources becomes complex

Engineering Contradiction:

Improveresource reservation stabilityVSAvoidtiming coordination complexity

Core Design Contradiction:

Stability of the object's compositionVSDevice complexity

Solution Approach 1:

The base station acts as an intermediary that coordinates between CG and DG resource allocation. It first provides CG resources through stable RRC signaling for reliable reservation, then uses DCI to allocate DG resources with timing information that references the CG resources. This intermediary coordination mechanism resolves the timing complexity while maintaining reservation stability.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Productivity

If DG resources are allocated through DCI, then dynamic resource allocation is improved, but timing conflicts with CG resources occur

Engineering Contradiction:

Improveresource allocation efficiencyVSAvoidtime collision

Core Design Contradiction:

ProductivityVSLoss of time

Solution Approach 1:

The base station performs preliminary allocation of CG resources before allocating DG resources. The DCI containing DG resource allocation includes timing information that is coordinated with the previously allocated CG resources, ensuring that dynamic allocation improves productivity without causing time collisions between the two resource types.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS12120668B2Method and device for performing SL communication on basis of resource allocation mode 1 in NR V2X

Publication Date: 2024.10.15 LG ELECTRONICS INC

AI summary

Provided are a method for performing wireless communication by a first device and a device for supporting same. The method comprises: receiving, from a base station, information related to a configured grant (CG) resource, wherein the CG resource includes at least one of a first resource related to CG type 1 or a second resource related to CG type 2; receiving, from the base station, information related to a dynamic grant (DG) resource; and performing a first sidelink (SL) transmission based on one of the CG resource or the DG resource.