Sidelink HARQ-ACK Interlace Mapping for Unlicensed Spectrum
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Solution Overview
Problem
The challenge in wireless communication systems is the difficulty in ensuring communication quality and preventing interference when using unlicensed frequency spectrums, particularly with LTE and NR technologies, due to the simultaneous use of multiple communication facilities without exclusive frequency rights, leading to potential interference with conventional wireless devices.
Innovation Solution
A terminal and method for wireless communication that includes a communication module and processor configured to transmit and receive signals using a hybrid automatic repeat request-acknowledgement (HARQ-ACK) feedback on physical sidelink shared channels (PSSCH) and feedback channels (PSFCH), employing interlace structures for resource blocks (RBs) to manage HARQ-ACK feedback information, ensuring efficient resource allocation and interference mitigation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple communication facilities use unlicensed frequency spectrum simultaneously, then communication capacity and service coverage are improved, but interference with conventional wireless devices and communication quality degradation occur
Solution Approach 1:
The patent segments the unlicensed frequency spectrum into multiple interlace structures, where each interlace consists of non-contiguous resource blocks. This segmentation allows multiple communication facilities to operate simultaneously in different frequency segments, reducing mutual interference while maintaining overall communication capacity. The resource blocks are divided into first and second interlaces that can be independently allocated to different users or services.
Solution Approach 2:
The patent implements dynamic resource allocation where the base station can flexibly assign resource blocks from different interlaces to different terminals based on real-time channel conditions and traffic requirements. This dynamic allocation optimizes spectrum utilization while adapting to changing interference patterns, allowing the system to maintain high productivity while managing interference levels.
2Ease of operation
If resource blocks are allocated contiguously in frequency domain, then resource allocation simplicity is improved, but frequency selectivity and interference resistance are worsened
Solution Approach 1:
The patent divides resource blocks into multiple interlaces where resource blocks within each interlace are non-contiguous in frequency domain. This segmentation provides frequency diversity by spreading allocated resources across different frequency segments, making the transmission more resistant to frequency-selective fading and interference while maintaining manageable allocation complexity through standardized interlace patterns.
3Reliability
If HARQ-ACK feedback is transmitted using all available resource blocks, then feedback reliability is improved, but resource waste and system overhead increase
Solution Approach 1:
The patent applies partial action by allocating only a subset of available resource blocks for HARQ-ACK feedback transmission. Specifically, the terminal selects resource blocks from one or more interlaces based on channel conditions and feedback requirements, rather than using all available resources. This approach achieves sufficient feedback reliability while minimizing resource consumption and reducing system overhead.
Data Source
AI summary
This terminal for performing wireless communication in a wireless communication system may comprise: a communication module; and a processor for controlling the communication module, wherein the processor receives a physical sidelink shared channel (PSSCH), and transmits a physical sidelink feedback channel (PSFCH) including hybrid automatic repeat request-acknowledgement (HARQ-ACK) feedback information corresponding to the PSSCH, the PSFCH is transmitted in at least one resource block (RB) set, each RB set of the at least one RB set includes physical resource blocks (PRBs) of a first interlace structure and PRBs of a second interlace structure, first data is mapped to the PRBs of the first interlace structure, second data is mapped to the PRBs of the second interlace structure, the first data is the HARQ-ACK feedback information, and the first data and the second data are different from each other.