Interlaced NR-PUCCH Allocation for OCB, PSD, and NR-U Multiplexing
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Solution Overview
Problem
Legacy NR-PUCCH formats 2 and 3 are not suitable for NR-unlicensed spectrum due to regulatory limitations on Occupied Channel Bandwidth (OCB) and Power Spectral Density (PSD), limiting user multiplexing capacity and requiring enhancements to meet these requirements.
Innovation Solution
Enhancements to NR-PUCCH formats 2 and 3 include non-contiguous interlaced resource allocation, OCC-based multiplexing, and modified DMRS patterns to meet OCB and PSD regulations, enabling user multiplexing and improving UE capacity in unlicensed spectrum.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If legacy NR-PUCCH formats 2 and 3 are used, then the system can maintain simple resource allocation, but it cannot comply with regulatory limitations on Occupied Channel Bandwidth (OCB) and Power Spectral Density (PSD) in unlicensed spectrum
Solution Approach 1:
The patent divides the contiguous frequency resources into non-contiguous interlaced resource blocks. Instead of allocating a continuous block of PRBs, the system segments resources into separate interleaved blocks that are distributed across the frequency spectrum. This segmentation enables compliance with OCB and PSD regulations by spreading the transmission power and bandwidth occupancy across non-adjacent frequency slots, thereby resolving the contradiction between regulatory compliance and resource allocation simplicity.
Solution Approach 2:
The patent introduces dynamic resource allocation mechanisms where the interlace pattern and resource block assignments can be adapted based on channel conditions, traffic requirements, and regulatory constraints. This dynamic approach allows the system to flexibly adjust resource allocation to meet OCB and PSD requirements while maintaining efficient spectrum utilization, resolving the contradiction between adaptability to regulations and structural complexity.
2Adaptability or versatility
If non-contiguous interlaced resource allocation is implemented, then compliance with OCB and PSD regulations is achieved, but user multiplexing capacity is reduced
Solution Approach 1:
The patent combines multiple interlaced resource block sets into a unified resource allocation framework. By merging the separate non-contiguous resource blocks into a coordinated interlace structure, the system maintains regulatory compliance while enabling multiple users to be multiplexed across different interlace patterns. This merging approach allows efficient resource sharing and user multiplexing despite the non-contiguous nature of individual user allocations.
Solution Approach 2:
The patent creates a universal interlace-based resource allocation framework that can serve multiple functions: it ensures regulatory compliance with OCB and PSD, enables user multiplexing through different interlace assignments, and supports flexible resource sharing. This multi-functional design resolves the contradiction by making the same interlaced structure serve both regulatory compliance and user capacity requirements simultaneously.
3Productivity
If OCC-based multiplexing is used, then user multiplexing capacity is improved, but complexity of the multiplexing scheme increases
Solution Approach 1:
The patent applies Orthogonal Cover Codes (OCC) selectively rather than universally across all resource elements. By applying OCC-based multiplexing only to specific interlaced resource blocks or specific user pairs, the system improves user multiplexing capacity where needed while avoiding the full complexity overhead. This partial application approach resolves the contradiction between enhanced multiplexing capacity and scheme complexity.
Data Source
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AI summary
Systems and methods are described for a resource allocation and user multiplexing capacity enhancements for interlace based physical uplink control channel (PUCCH) formats in new radio (NR) using unlicensed spectrum (NR-U). The systems and methods can include at least generating, by the UE, an uplink signal according to a physical uplink control channel (PUCCH) format 2 and having "n" number of physical resource blocks (PRBs) that are mapped in an interlaced manner across a frequency domain on a orthogonal frequency division multiplexing (OFDM) symbol, wherein "n" is an integer multiple of a number of PRBs per interlace, and transmitting, by the UE, the uplink signal over a PUCCH that utilizes unlicensed spectrum in a new radio wireless network.