NR PUCCH Resource Allocation for Initial Access in Unlicensed Spectrum
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Solution Overview
Problem
Current NR PUCCH resource configurations in licensed spectrum are not suitable for NR-unlicensed spectrum due to regulatory limitations on Occupied Channel Bandwidth (OCB) and Power Spectral Density (PSD), requiring enhancements to support HARQ-ACK feedback during initial access.
Innovation Solution
Enhancements to NR PUCCH resource sets before RRC connection setup, including configurations for PUCCH formats 0 and 1, and the introduction of new parameters to support multi-PRB transmissions, such as contiguous and non-contiguous PRB allocations, to meet OCB and PSD regulatory requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If legacy NR PUCCH resource configurations are used in licensed spectrum, then the system operates with established protocols, but the configurations are not suitable for NR-unlicensed spectrum due to regulatory limitations on OCB and PSD
Solution Approach 1:
The patent modifies PUCCH resource configuration parameters including bandwidth allocation, power spectral density limits, and resource block assignments to comply with unlicensed spectrum regulations while maintaining HARQ-ACK feedback functionality. Specific parameters such as OCB and PSD are adjusted to meet regulatory requirements.
Solution Approach 2:
The enhanced PUCCH resource configuration framework is designed to serve multiple functions: supporting both licensed and unlicensed spectrum operations, enabling HARQ-ACK feedback during initial access, and accommodating diverse regulatory requirements across different regions through configurable parameters.
2Reliability
If PUCCH resource configurations are enhanced to support multi-PRB transmissions, then OCB and PSD regulatory requirements are met, but the device complexity and configuration overhead increase
Solution Approach 1:
The PUCCH resource configuration is segmented into multiple parameters and sub-configurations that can be independently adjusted. This includes separate configurations for bandwidth, power spectral density, resource block assignments, and format selections, allowing granular control to meet regulatory requirements without overwhelming complexity.
Solution Approach 2:
The patent introduces dynamic configuration mechanisms where PUCCH resource parameters can be adjusted based on regulatory environment, spectrum conditions, and network requirements. This includes dynamic selection of PUCCH formats and resource block allocations to optimize compliance while managing complexity.
3Reliability
If new PUCCH formats and resource allocations are introduced for NR-unlicensed, then support for HARQ-ACK feedback during initial access is improved, but the deviation from Rel-15 NR framework increases
Solution Approach 1:
The patent establishes preliminary PUCCH resource configuration frameworks and parameter sets that are pre-defined to comply with unlicensed spectrum regulations. These pre-configured resource allocations and format selections reduce the need for complex real-time adjustments and minimize deviation from the Rel-15 framework.
Solution Approach 2:
The patent introduces intermediary configuration parameters and signaling mechanisms that bridge the gap between Rel-15 NR framework and unlicensed spectrum requirements. These intermediaries allow incremental enhancements rather than complete redesign, reducing overall system complexity.
Data Source
AI summary
Disclosed embodiments are related to resource allocation to 3GPP New Radio (NR) physical uplink control channel (PUCCH) in unlicensed spectrum. Embodiments include enhancements of NR PUCCH resource sets before dedicated PUCCH configuration via Radio Resource Control (RRC) signaling to enable PUCCH configuration during initial access in NR-unlicensed. Other embodiments may be described and/or claimed.