Adaptive PSFCH Interlace Selection for Sidelink OCB Compliance
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Solution Overview
Problem
The existing PSFCH transmission scheme for sidelink communication in unlicensed spectrum fails to meet the occupied channel bandwidth (OCB) regulatory requirements, and is not resource efficient, leading to inefficiencies and increased mutual interference.
Innovation Solution
Adaptive NR sidelink HARQ feedback mechanism that employs partial or full interlace transmission based on channel occupancy time (COT) sharing, allowing flexible resource utilization and interference reduction, ensuring OCB compliance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If full interlace transmission is used for PSFCH, then OCB regulatory requirements are met, but resource efficiency decreases and mutual interference increases
Solution Approach 1:
The patent segments the full interlace into multiple partial interlaces, where each partial interlace contains a subset of resource blocks. This allows the system to meet OCB requirements by transmitting on multiple separated resource blocks while avoiding the need to occupy the entire channel bandwidth, thereby improving resource efficiency and reducing mutual interference.
Solution Approach 2:
The patent applies different transmission strategies to different parts of the frequency spectrum. Instead of uniformly using full interlace across the entire bandwidth, it selectively uses partial interlaces in specific frequency regions, allowing optimized resource utilization and interference management in each local area while maintaining overall OCB compliance.
2Reliability
If full interlace transmission is used for PSFCH, then OCB regulatory requirements are met, but mutual interference increases
Solution Approach 1:
By segmenting the full interlace into multiple partial interlaces transmitted at different times or frequencies, the patent reduces the simultaneous occupancy of channel resources. This segmentation approach maintains OCB compliance while distributing transmissions to reduce mutual interference between multiple users sharing the unlicensed spectrum.
3Productivity
If partial interlace transmission is used for PSFCH, then resource efficiency improves, but OCB regulatory requirements may not be met
Solution Approach 1:
The patent combines multiple partial interlace transmissions to achieve the required occupied channel bandwidth. By merging the spectral coverage of several partial interlaces, the system simultaneously achieves resource efficiency through selective transmission and OCB compliance through aggregate bandwidth occupancy.
4Productivity
If adaptive interlace selection is implemented, then resource efficiency and interference reduction are achieved, but device complexity increases
Solution Approach 1:
The patent implements dynamic interlace selection where the transmitting device adapts its transmission strategy based on real-time conditions such as detected COT sharing status. This dynamic approach allows the system to switch between partial and full interlace modes as needed, achieving resource efficiency and interference reduction while managing complexity through condition-based decision making.
Data Source
AI summary
Systems, methods, apparatuses, and computer program products for enhanced PSFCH transmission for SL-U are provided. One method may include decoding, by a receiving user equipment, a physical sidelink shared channel (PSSCH), and determining a physical sidelink feedback channel (PSFCH) resource for hybrid automatic repeat request (HARQ) feedback to the physical sidelink shared channel (PSSCH). The method may then include determining whether to transmit the hybrid automatic repeat request (HARQ) feedback with partial interlace or with full interlace based at least on whether channel occupancy time (COT) sharing is detected from a transmitting user equipment.