Sidelink Resource Re-Selection for LTE-NR Co-Channel Coexistence

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Solution Overview

Problem

In scenarios of LTE sidelink and NR sidelink co-channel coexistence, there is a challenge of resource conflicts and reduced reliability due to overlapping reserved resources, which existing technologies have not effectively addressed.

Innovation Solution

A method where user equipment determines a resource subset for PSSCH/PSCCH transmission, reports pre-emption of resources to a higher layer, and performs resource re-selection to avoid conflicts, ensuring that reserved resources indicated by the LTE sidelink module are accounted for in NR sidelink communication.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If LTE sidelink and NR sidelink share the same channel for coexistence, then spectrum utilization is improved, but resource conflicts and reliability deteriorate due to overlapping reserved resources

Engineering Contradiction:

Improvespectrum utilizationVSAvoidcommunication reliability

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The patent segments the resource pool by introducing a pre-emption indication mechanism that divides resources into protected LTE resources and available NR resources. The MAC layer segments the candidate resource set by excluding resources indicated by pre-emption information, thereby separating LTE and NR resource usage to prevent conflicts while maintaining co-channel operation.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces pre-emption indication information as an intermediary mechanism between LTE and NR sidelink systems. This intermediary carries resource reservation information from LTE to NR, enabling NR user equipment to identify and avoid conflicting resources without direct interference, thus mediating the coexistence of both systems on the same channel.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If user equipment performs sensing-based resource allocation in NR sidelink, then resource allocation efficiency is improved, but resource conflicts with LTE sidelink worsen due to lack of awareness of LTE reserved resources

Engineering Contradiction:

Improveresource allocation efficiencyVSAvoidresource conflict avoidance

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent implements a feedback mechanism where pre-emption indication information is fed back from the physical layer to the MAC layer. This feedback loop provides the MAC layer with awareness of LTE reserved resources, enabling it to make informed resource allocation decisions that avoid conflicts while maintaining sensing-based allocation efficiency.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent applies preliminary action by having the physical layer perform pre-emption checks on selected transmission resources before final NR sidelink transmission. The MAC layer also performs preliminary exclusion of resources indicated by pre-emption information when determining candidate resource sets, preventing conflicts before they occur.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS20260052527A1Method performed by user equipment, and user equipment

Publication Date: 2026.02.19 SHARP KK

AI summary

The present invention provides a method performed by user equipment, and user equipment. The method includes: a higher layer requesting or triggering the user equipment to determine a resource subset for a physical sidelink shared channel (PSSCH)/physical sidelink control channel (PSCCH) transmission; and the user equipment reporting pre-emption of a resource to the higher layer.