NR Sidelink PSFCH Interlaced PRBs for OCB-Compliant HARQ
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Solution Overview
Problem
The existing HARQ feedback mechanism for NR sidelink communication in unlicensed spectrum does not meet the Occupied Channel Bandwidth (OCB) regulatory requirement and is inefficient due to Listen-Before-Talk (LBT) failures, leading to reduced reliability and resource wastage.
Innovation Solution
Enhanced PSFCH transmission scheme that transmits HARQ feedbacks on interlaced PRBs, including the mapped PSFCH resource, to meet OCB requirements and improve reliability by providing additional opportunities for HARQ feedbacks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional PSFCH transmission is used in unlicensed spectrum, then the existing HARQ feedback mechanism can be implemented, but it does not meet the OCB regulatory requirement and suffers from LBT failures reducing reliability
Solution Approach 1:
The patent segments the PSFCH transmission by distributing HARQ feedback across multiple PRBs instead of concentrating it in a single resource. This segmentation allows the transmission to meet OCB requirements by occupying multiple frequency resources simultaneously, thereby improving reliability while complying with unlicensed spectrum regulations.
Solution Approach 2:
The patent introduces frequency diversity by mapping PSFCH to multiple PRBs across different frequency resources. This dimensional expansion from a single resource to multiple resources enables the system to meet OCB requirements and provides additional transmission opportunities, thereby improving HARQ feedback reliability in unlicensed spectrum.
2Object-affected harmful factors
If PSFCH is transmitted on multiple PRBs to meet OCB requirements, then regulatory compliance is achieved, but the complexity of determining and transmitting feedback increases
Solution Approach 1:
The patent establishes predetermined mapping relationships between PSSCH and PSFCH resources before actual transmission occurs. This preliminary configuration of resource mapping rules simplifies the determination process during transmission, allowing devices to automatically select appropriate PRBs for PSFCH without complex real-time calculations, thus reducing device complexity while ensuring OCB compliance.
Solution Approach 2:
The patent implements a feedback mechanism where the selected PSFCH resources are indicated to the receiving device through control information. This feedback loop ensures that both transmitting and receiving devices are aligned on the resource allocation, simplifying the overall system operation while maintaining regulatory compliance through structured resource determination.
3Reliability
If HARQ feedback is transmitted on multiple time instances, then additional transmission opportunities are provided improving reliability, but the time required for feedback transmission increases
Solution Approach 1:
The patent segments the feedback transmission across multiple time instances, allowing different portions of HARQ feedback to be transmitted at different times. This segmentation provides multiple transmission opportunities that improve reliability through diversity, while the overall time consumption is managed by efficiently distributing the feedback across multiple shorter transmission intervals rather than a single prolonged transmission.
Data Source
AI summary
Embodiments of the present disclosure relate to devices, methods, apparatuses and computer readable storage media of an enhancement scheme of PSFCH transmission for NR SL communication in unlicensed spectrum. The method includes receiving, from a second device, a plurality of physical sidelink channels on multiple time instances, wherein the plurality of physical sidelink channels include Physical Sidelink Shared Channels (PSSCHs) and/or Physical Sidelink Control Channels (PSCCHs); determining a plurality of Physical Sidelink Feedback Channels (PSFCHs) in a plurality of Physical Resource Blocks (PRBs) within a first slot, wherein the plurality of PSFCHs convey Hybrid Automatic Repeat Request (HARQ) feedbacks corresponding to the plurality of physical sidelink channels; and transmitting, to the second device, the HARQ feedbacks on the plurality of PSFCHs in the plurality of PRBs.