PUCCH Format 0 Orthogonal Sequence Mapping for NR-U Multiplexing
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Solution Overview
Problem
Current PUCCH formats in NR-U lack sufficient user equipment (UE) multiplexing capability and resource utilization efficiency, particularly in non-power-limited scenarios, and require improved maximum coupling loss (MCL) and payload size support.
Innovation Solution
The proposed solution involves mapping a plurality of mutually orthogonal sequences to physical resource blocks (PRBs) within an interlace for PUCCH transmission in NR-U, using techniques such as cycling through sequences with specific intervals to reduce peak-to-average power ratio (PAPR) and optimize sequence indexes for better waveform efficiency, allowing for increased UE multiplexing and payload support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If e-PF0 is carried by an interlace with 120 subcarriers in NR-U, then the frequency domain resources are expanded, but the UE multiplexing capability and payload size remain limited compared to NR PF0
Solution Approach 1:
The interlace is segmented into multiple groups of PRBs, and multiple orthogonal sequences are mapped to different PRB groups. This segmentation allows different UEs to be multiplexed across different segments of the interlace, thereby increasing UE multiplexing capability while utilizing the expanded frequency domain resources.
Solution Approach 2:
The patent extends the multiplexing dimension from single-PRB based sequences to multi-PRB based sequences within the interlace. By mapping sequences across multiple PRBs in the frequency domain, the system achieves higher UE multiplexing capability and supports larger payload sizes, effectively utilizing the expanded frequency resources.
2Productivity
If more UEs are multiplexed on e-PF0 in NR-U, then resource utilization efficiency improves, but sequence design complexity increases to maintain orthogonality and low PAPR
Solution Approach 1:
The patent changes the parameters of orthogonal sequences by mapping them across multiple PRBs within the interlace structure. This parameter change allows maintaining orthogonality through structured mapping while achieving higher UE multiplexing capability and better resource utilization efficiency.
3Reliability
If sequence mapping is optimized for low PAPR, then waveform efficiency improves, but the number of supported UEs and payload sizes are constrained
Solution Approach 1:
The patent extends the sequence mapping from single-PRB to multi-PRB dimensions within the interlace. This dimensional extension allows the system to maintain low PAPR through proper orthogonal sequence mapping while simultaneously supporting larger payload sizes and more UEs by utilizing the expanded frequency domain structure.
Data Source
AI summary
An apparatus (e.g., a user equipment (UE)) maps a plurality of mutually orthogonal sequences to each of a plurality of physical resource blocks (PRBs) within an interlace. The apparatus then performs a physical uplink control channel (PUCCH) transmission in a New Radio unlicensed spectrum (NR-U). The apparatus also receives an assignment of a set of sequences for each PRB of the plurality of PRBs from a wireless network. In response, the apparatus performs an uplink control information (UCI) transmission via the PUCCH in the NR-U.