Vehicular Platoon NACK Feedback Using Primary and Secondary UEs

Solution Overview

Problem

In vehicular platoons, configuring each vehicle UE with a full set of V2X features for distance-based NACK procedures is inefficient, leading to unnecessary computational complexity and resource consumption.

Innovation Solution

Designating primary and secondary UEs within a platoon, where the primary UE performs and transmits distance-based NACK calculations for secondary UEs, reducing computational requirements and resource usage by secondary UEs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If each vehicle UE is configured with a full set of V2X features for distance-based NACK procedures, then the reliability of error detection and feedback is improved, but the computational complexity and resource consumption increase

Engineering Contradiction:

Improveerror detection and feedback reliabilityVSAvoidcomputational complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The platoon is segmented into primary UE and secondary UEs, dividing the NACK procedure responsibilities. The primary UE performs distance-based NACK calculations and transmits NACK feedback, while secondary UEs rely on the primary UE's calculations, thus reducing individual device complexity while maintaining overall system reliability

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The NACK calculation functions of multiple secondary UEs are merged into the primary UE. Instead of each UE independently performing distance-based NACK procedures, the primary UE consolidates these calculations and represents the entire platoon's NACK feedback, reducing redundant computations across the system

Inventive Principle:

Principle #5Merging (Combining)

2Speed

If each vehicle UE performs autonomous distance-based NACK calculations, then the responsiveness of error feedback is improved, but the power consumption and resource usage increase

Engineering Contradiction:

Improvefeedback responsivenessVSAvoidpower consumption

Core Design Contradiction:

SpeedVSUse of energy by moving object

Solution Approach 1:

The platoon is segmented into primary UE and secondary UEs, dividing the NACK procedure responsibilities. The primary UE performs distance-based NACK calculations and transmits NACK feedback, while secondary UEs rely on the primary UE's calculations, thus reducing individual device complexity while maintaining overall system reliability

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The NACK calculation functions of multiple secondary UEs are merged into the primary UE. Instead of each UE independently performing distance-based NACK procedures, the primary UE consolidates these calculations and represents the entire platoon's NACK feedback, reducing redundant computations across the system

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS12587320B2Distance-based NACK procedures in a vehicular platoon

Publication Date: 2026.03.24 QUALCOMM INC

AI summary

Methods, systems, and devices for wireless communications are described. A user equipment (UE), such as a vehicle UE may receive an indication of a change in a formation of a vehicle grouping, such as a platoon, with which the UE is associated, the vehicle grouping including a plurality of vehicles moving as a group based on sidelink communications between members of the group. The UE may determine a distance-based feedback procedure to be used by the UE based on whether the UE is, as a result of the change in the formation, a primary vehicle in the vehicle grouping or a secondary vehicle that is responsive to one or more primary vehicles in the vehicle grouping, and may operate in accordance with the distance-based feedback procedure.