Sidelink Groupcast Feedback With Dedicated PUCCH Resources

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Solution Overview

Problem

In groupcast communication within the Internet of Vehicles (IoV) system, there is no technical solution for group members to send feedback information to the group header in response to groupcast messages.

Innovation Solution

A first terminal device receives a message from a second terminal device, obtains a transmission resource not used for data transmission to other devices in the same group, and sends feedback information to the second terminal device using this resource.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If groupcast communication is implemented in IoV system, then spectrum efficiency and transmission delay are improved, but feedback communication mechanism is missing

Engineering Contradiction:

Improvespectrum efficiencyVSAvoidfeedback information

Core Design Contradiction:

ProductivityVSLoss of information

Solution Approach 1:

The patent implements a feedback mechanism where group members send feedback information to the group header using PUCCH resources. The group header configures dedicated PUCCH resources for each group member, enabling reliable feedback transmission for groupcast communication. This resolves the contradiction by adding the missing feedback pathway while preserving the efficient groupcast data transmission.

Inventive Principle:

Principle #23Feedback

2Loss of time

If direct terminal-to-terminal communication is adopted, then transmission delay is reduced, but resource allocation complexity increases

Engineering Contradiction:

Improvetransmission delayVSAvoidresource allocation

Core Design Contradiction:

Loss of timeVSDevice complexity

Solution Approach 1:

The patent uses the group header as an intermediary to manage resource allocation for groupcast communication. The group header receives resource allocation information from the network and distributes it to group members, simplifying the resource management complexity while maintaining direct terminal-to-terminal communication benefits.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If PUCCH resources are configured for feedback transmission, then feedback reliability is improved, but resource collision may occur

Engineering Contradiction:

Improvefeedback transmissionVSAvoidresource collision

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent segments PUCCH resources by associating each group member with dedicated PUCCH resources configured by the group header. This segmentation approach ensures that feedback from different group members uses distinct time-frequency resources, eliminating resource collisions while maintaining reliable feedback transmission.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS12356378B2Communication methods and devices for sidelink

Publication Date: 2025.07.08 GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORP LTD

AI summary

Communication methods and devices for a sidelink (SL) are provided. A communication method for an SL includes the following. A first terminal device obtains a first transmission resource. The first terminal device sends first feedback information to a second terminal device, by using the first transmission resource. A time unit in which the first transmission resource is located is not used for transmitting data by the first terminal device to at least one third terminal device or the second terminal device, where the first terminal device, the second terminal device, and the at least one third terminal device belong to a first group.