Sidelink PSFCH Allocation in Shared Spectrum COT Resources

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Solution Overview

Problem

The configuration of multiple transmission opportunities for physical sidelink feedback channels (PSFCH) in shared spectrum leads to interruptions of channel occupancy time (COT) resources, adversely affecting communication efficiency in sidelink communication.

Innovation Solution

A method and apparatus for sidelink communication that involves determining COT resources and assigning PSFCH resources to multiple terminal devices based on a first set of PSFCHs to be transmitted, thereby avoiding interruptions and improving resource utilization.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If multiple transmission opportunities are configured for PSFCH in COT resources, then transmission success rate is improved, but COT resource continuity is interrupted

Engineering Contradiction:

Improvetransmission success rateVSAvoidCOT resource continuity

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The patent implements dynamic PSFCH resource allocation within COT resources, where the gNB dynamically determines and assigns PSFCH resources to multiple terminal devices based on actual transmission needs. This dynamic approach allows the system to adapt resource allocation in real-time, maintaining COT continuity while ensuring transmission success through multiple opportunistic assignments within the same COT.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent segments COT resources into multiple PSFCH transmission opportunities that are distributed across the COT duration. By dividing the COT into multiple usable segments for PSFCH transmission, the system achieves both continuity of COT and multiple transmission opportunities, resolving the contradiction between reliability and stability.

Inventive Principle:

Principle #1Segmentation

2Productivity

If multiple PSFCH transmission opportunities are allocated, then resource utilization is improved, but COT interruption occurs

Engineering Contradiction:

Improveresource utilization rateVSAvoidCOT interruption time

Core Design Contradiction:

ProductivityVSLoss of time

Solution Approach 1:

The patent employs preliminary action by having the gNB pre-configure multiple PSFCH resources within COT resources before terminal devices need to transmit. This advance preparation ensures that when transmission opportunities arise, pre-allocated resources are immediately available, improving resource utilization without causing COT interruptions since all allocations occur within the continuous COT framework.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent maintains continuity of useful action by ensuring that multiple PSFCH transmission opportunities are embedded within a continuous COT structure. The gNB manages resource allocation such that transmission activities continue without interruption throughout the COT period, maximizing productivity while eliminating time loss from COT interruptions.

Inventive Principle:

Principle #20Continuity of useful action

Data Source

PatentUS20250365746A1Method and apparatus for sidelink communication

Publication Date: 2025.11.27 QUECTEL WIRELESS SOLUTIONS CO LTD

AI summary

Disclosed are a method and apparatus for sidelink communication. The method is applicable to a first terminal device and includes: determining COT resources in shared spectrum, wherein the COT resources include PSFCH resources for transmitting PSFCHs; and assigning the PSFCH resources to a plurality of terminal devices sharing the COT resources based on a first set of PSFCHs to be transmitted, wherein the plurality of terminal devices include the first terminal device.