Sidelink HARQ Feedback Resource Allocation in 5G NR

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Solution Overview

Problem

Current 5G NR systems face challenges in efficiently transmitting sidelink HARQ feedback information due to the need for flexible radio resource allocation across different numerologies and scenarios, such as eMBB, mMTC, and URLLC, which require varying data rates, latency, and reliability.

Innovation Solution

The method involves configuring a physical sidelink feedback channel (PSFCH) resource set for transmitting HARQ feedback information, where a receiver UE receives configuration information and determines the appropriate PSFCH resource based on pre-configured identification for transmitting feedback to a transmitter UE, allowing efficient allocation and transmission of sidelink HARQ feedback.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If flexible radio resource allocation is implemented to meet diverse scenario requirements (eMBB, mMTC, URLLC), then adaptability is improved, but device complexity increases

Engineering Contradiction:

Improveadaptability to different usage scenariosVSAvoidcomplexity of resource allocation mechanism

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The PSFCH resource set is segmented into multiple individual PSFCH resources that can be independently selected and allocated. This segmentation allows the system to provide flexible resource allocation for different scenarios (eMBB, mMTC, URLLC) by selecting appropriate resources from the set, thereby improving adaptability without requiring a completely new allocation mechanism for each scenario.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The PSFCH resource allocation is designed to be dynamic, where the receiver UE determines the specific PSFCH resource based on pre-configured identification information and current transmission conditions. This dynamic selection mechanism enables the system to adapt to different usage scenarios in real-time while maintaining a unified resource management framework, balancing flexibility and complexity.

Inventive Principle:

Principle #15Dynamics

2Reliability

If PSFCH resource set is configured for sidelink HARQ feedback, then feedback reliability is improved, but loss of time in resource determination increases

Engineering Contradiction:

Improvereliability of HARQ feedback transmissionVSAvoidtime for determining PSFCH resource

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The PSFCH resource set is pre-configured with multiple available resources and identification information before actual HARQ feedback transmission is needed. This preliminary configuration allows the receiver UE to quickly determine the appropriate PSFCH resource by matching pre-configured identification information with current transmission conditions, reducing the time required for resource determination while ensuring reliable feedback transmission.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS11539475B2Method and apparatus for transmitting sidelink HARQ feedback information

Publication Date: 2022.12.27 KT CORP

AI summary

Provided are methods and apparatuses for transmitting sidelink hybrid automatic repeat request (HARQ) feedback information. The method of a receiver user equipment (UE) includes: receiving configuration information on a physical sidelink feedback channel (PSFCH) resource set, receiving a physical sidelink shared channel (PSSCH) from a transmitter UE, determining a PSFCH resource used for transmitting the HARQ feedback information in response to the PSSCH in the PSFCH resource set based on pre-configured identification information, and transmitting the HARQ feedback information using the PSFCH resource.