Sidelink HARQ Feedback Timing Across PSFCH Resources

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Solution Overview

Problem

Existing sidelink communication systems in wireless networks face inefficiencies in hybrid automatic repeat request (HARQ) feedback mechanisms, particularly in device-to-device (D2D) communication, leading to suboptimal resource utilization and performance.

Innovation Solution

Implementing a mechanism for sidelink HARQ feedback by configuring wireless devices to transmit HARQ feedback based on physical sidelink feedback channel (PSFCH) resources associated with physical sidelink shared channel (PSSCH) transmissions, with specific timing and resource allocation strategies to enhance communication efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If traditional HARQ feedback mechanisms are used in sidelink communication, then device-to-device communication can be established, but resource utilization is suboptimal and communication efficiency is reduced

Engineering Contradiction:

Improvecommunication efficiencyVSAvoidresource utilization

Core Design Contradiction:

ProductivityVSLoss of energy

Solution Approach 1:

The patent implements dynamic HARQ feedback mechanisms where wireless devices can adaptively adjust feedback timing and resource allocation based on real-time communication conditions. The system dynamically selects optimal feedback moments and allocates PSFCH resources accordingly, transforming static resource allocation into a dynamic process that responds to channel conditions, thereby improving resource utilization and communication efficiency simultaneously

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes key parameters of the HARQ feedback process including feedback timing offsets, resource allocation patterns, and acknowledgment mechanisms. By modifying these parameters dynamically based on communication quality and device capabilities, the system optimizes both resource utilization and communication efficiency, resolving the contradiction between productivity and energy loss

Inventive Principle:

Principle #35Parameter changes

2Reliability

If HARQ feedback is transmitted using physical sidelink feedback channel resources, then feedback reliability is improved, but latency increases due to timing constraints

Engineering Contradiction:

Improvefeedback reliabilityVSAvoidfeedback latency

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent applies preliminary action by pre-configuring multiple PSFCH resources and timing opportunities before the actual feedback transmission is needed. The system prepares feedback timing offsets and resource allocations in advance, allowing the transmitting device to select from pre-planned options that balance reliability and latency requirements without waiting for real-time decisions

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system dynamically adjusts feedback timing and resource selection based on actual communication conditions, allowing the device to choose optimal feedback moments that minimize latency while ensuring reliability. This dynamic adaptation enables the system to resolve the contradiction between feedback reliability and latency by making real-time decisions about when and how to transmit feedback

Inventive Principle:

Principle #15Dynamics

3Productivity

If resource allocation is optimized for HARQ feedback, then communication efficiency improves, but system complexity increases due to additional timing and resource management

Engineering Contradiction:

Improveresource utilization efficiencyVSAvoidtiming and resource management complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent makes the PSFCH resources and timing mechanisms multi-functional, serving both feedback transmission and resource allocation purposes. The same infrastructure used for feedback can also indicate resource assignments and communication parameters, eliminating the need for separate dedicated signaling channels and reducing overall system complexity while maintaining high resource utilization efficiency

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The system uses feedback mechanisms where receiving devices provide information about channel conditions and resource availability, which transmitting devices use to optimize their feedback timing and resource selection. This feedback loop enables automatic adaptation to network conditions, simplifying manual configuration and reducing operational complexity while improving resource utilization efficiency

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS12375225B2Sidelink hybrid automatic repeat request acknowledgement information generation

Publication Date: 2025.07.29 OFINNO LLC

AI summary

A first wireless receives a message comprising one or more configuration parameters indicating: a number of a plurality of physical sidelink feedback channel (PSFCH) resources that are associated with a physical sidelink shared channel (PSSCH) transmission, and a period of the plurality of PSFCH resources, wherein a time interval of two consecutive PSFCH resources, of the plurality of PSFCH resources, is equal to the period of the plurality of PSFCH resources. The first wireless device transmits, to a second wireless device and via a first slot, a first PSSCH transmission. The first wireless device sends a hybrid automatic repeat request (HARQ) feedback based on at least one PSFCH reception in a first plurality of PSFCH resources, of the plurality of PSFCH resources, wherein the first plurality of PSFCH resources occur at least one slot after the first slot.