Cluster-Based PSFCH Interlaces for Unlicensed Sidelink HARQ Feedback
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Solution Overview
Problem
There is a need for effective handling of sidelink transmissions on an unlicensed spectrum, particularly in improving the physical sidelink feedback channel (PSFCH) capacity and resource determination for hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback in wireless communication systems.
Innovation Solution
The introduction of a cluster-based interlace structure for PSFCH transmission, where each interlace comprises a set of subcarrier clusters that are equally spaced in the frequency bandwidth, and the use of non-interleaved or interleaved subcarrier-to-cluster mapping to determine Type-1 interlaces for transmitting or receiving HARQ-ACK feedback, ensuring compliance with regulatory requirements and enhancing resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If traditional PSFCH resource allocation is used, then implementation is simple, but PSFCH capacity is insufficient for unlicensed spectrum requirements
Solution Approach 1:
The frequency bandwidth is segmented into multiple Type-1 interlaces, where each interlace contains a specific pattern of resource blocks. This segmentation allows the PSFCH capacity to be increased by utilizing more frequency resources while maintaining a structured and manageable allocation framework that doesn't overly complicate the resource determination process.
Solution Approach 2:
The patent introduces a new dimension to resource allocation by defining interlaces with specific frequency span requirements (exceeding a predefined percentage of carrier bandwidth). This dimensional approach to resource organization enables scalable PSFCH capacity that adapts to different unlicensed spectrum configurations without fundamentally changing the allocation mechanism.
2Reliability
If frequency resources are increased to meet OCB requirements, then regulatory compliance is achieved, but resource allocation complexity increases
Solution Approach 1:
The patent establishes specific parameter thresholds for interlace design, including the frequency span requirement (exceeding a predefined percentage of carrier bandwidth) and the equal spacing of subcarrier clusters. These parameter constraints ensure automatic compliance with OCB and PSD requirements while providing a clear framework for implementation that reduces the complexity of frequency resource management.
3Reliability
If subcarrier clusters are equally spaced across frequency bandwidth, then frequency diversity is improved, but resource determination complexity increases
Solution Approach 1:
The resource pool for PSFCH is pre-configured with Type-1 interlaces that have predetermined subcarrier cluster patterns and frequency spacing. This preliminary organization of resources with explicit frequency span requirements allows UEs to quickly determine appropriate PSFCH resources without performing complex real-time calculations, thereby maintaining frequency diversity benefits while simplifying the resource determination process.
Data Source
AI summary
Embodiments of the present disclosure relate to methods and apparatuses for a cluster-based sidelink transmission(s) over an unlicensed spectrum. According to some embodiments of the disclosure, a UE may: receive data transmission on a PSSCH on a carrier; determine a first Type-1 interlace from a first set of Type-1 interlaces for transmitting a PSFCH carrying HARQ-ACK feedback corresponding to the data transmission, wherein each of the first set of Type-1 interlaces has a frequency span exceeding a predefined percentage of a frequency bandwidth of the carrier; and transmit the PSFCH on the first Type-1 interlace.