PUCCH OCC Sequence Selection for NR-U Bandwidth and PSD Limits
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Solution Overview
Problem
Existing technologies lack a defined method to generate a signal that meets the minimum occupied bandwidth and maximum Power Spectral Density requirements for Physical Uplink Control Channel (PUCCH) transmissions in New Radio-Unlicensed (NR-U) networks, which is crucial for effective operation in unlicensed bands.
Innovation Solution
A method for selecting Orthogonal Cover Codes (OCC) repetition sequences for PUCCH transmission is developed, utilizing a set of time and frequency domain variables to determine a PUCCH sequence that satisfies the bandwidth and PSD requirements, involving functions such as minimum(), maximum(), mean(), and median() to calculate the sequence based on OFDM symbols and slot numbers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a PUCCH transmission is performed in NR-U network without a defined sequence selection method, then the transmission can proceed, but the occupied bandwidth and Power Spectral Density requirements cannot be satisfied
Solution Approach 1:
The patent applies parameter changes by selecting different PUCCH sequences based on time-domain and frequency-domain variables. The sequence selection is determined by functions of OFDM symbol indices, slot numbers, and resource block allocations, which dynamically adjust the sequence parameters to satisfy bandwidth and PSD requirements in NR-U networks
Solution Approach 2:
The patent implements preliminary action by pre-defining a set of candidate PUCCH sequences and establishing selection criteria before actual transmission. The wireless device determines the appropriate sequence from the predefined set based on current transmission parameters, ensuring compliance with regulatory requirements before the PUCCH transmission occurs
2Area of stationary object
If multiple PUCCH sequences are used to satisfy bandwidth requirements, then the occupied bandwidth increases, but the multiplexing capacity may be reduced
Solution Approach 1:
The patent applies local quality by using Orthogonal Cover Codes (OCC) to differentiate PUCCH transmissions. Different OCC sequences are applied to different wireless devices or different time-frequency resources, allowing multiple devices to share the same physical resources while maintaining orthogonality. This preserves multiplexing capacity while ensuring sufficient occupied bandwidth through the OCC differentiation
Data Source
AI summary
A method for selecting orthogonal cover codes repetition sequence for Physical Uplink Control Channel (PUCCH) transmission in a New Radio-Unlicensed (NR-U) network is provided. In embodiments disclosed herein, a set of time domain and/or frequency domain variables, Φ, is first determined to be used in a function, ƒ(Φ), that determines a selected PUCCH sequence, rl(m), among at least two PUCCH sequences to be repeated with Orthogonal Cover Codes (OCC). Accordingly, a subset of the selected PUCCH sequence, rl(m), is repeated with OCC. By employing the method disclosed herein to determine the selected PUCCH sequence, rl(m), for repetition with OCC, it is possible to satisfy the occupied bandwidth and the maximum Power Spectral Density (PSD) requirements mandated in the NR-U network.