User Terminal Uplink Control Reporting via Dynamic PUCCH Formats
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Solution Overview
Problem
Future radio communication systems, such as 5G and NR, face challenges in maintaining coverage and throughput due to the application of existing LTE systems' UCI transmission methods, which may deteriorate performance.
Innovation Solution
The development of a user terminal and radio communication method that employs a short PUCCH and long PUCCH format, with DMRS-based and sequence-based transmission, to efficiently report UL control information, utilizing multiple numerologies and adaptive phase rotation techniques to optimize resource allocation and error rate management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing LTE systems' UCI transmission methods are applied to future radio communication systems, then compatibility with legacy systems is maintained, but coverage and throughput deteriorate
Solution Approach 1:
The patent implements dynamic selection between short PUCCH and long PUCCH formats based on scheduling request status and uplink control information. The system adapts the PUCCH format, numerology, and resource allocation dynamically rather than using fixed LTE-style configurations, enabling optimal performance for future 5G/NR requirements while maintaining backward compatibility where applicable
Solution Approach 2:
The patent changes key parameters including introducing multiple numerologies (subcarrier spacing configurations), adjusting PUCCH format selections, and modifying resource allocation strategies. These parameter changes enable the system to overcome the coverage and throughput limitations of legacy LTE UCI transmission methods while adapting to future radio communication system requirements
2Loss of time
If short PUCCH format is used for UL control information reporting, then latency is reduced, but coverage and reliability may be compromised
Solution Approach 1:
The system dynamically selects between short PUCCH format (for low latency when SR is absent) and long PUCCH format (for better coverage when SR is present), with the selection based on real-time scheduling request status and channel conditions. This dynamic adaptation resolves the contradiction between latency reduction and coverage maintenance
Solution Approach 2:
The patent employs different numerologies (subcarrier spacing configurations) for short and long PUCCH formats, adjusting the time-frequency parameters according to the selected format and service requirements. This parameter adaptation enables short PUCCH to achieve low latency while long PUCCH maintains coverage and reliability
3Adaptability or versatility
If multiple numerologies are employed for resource allocation, then adaptability to different service requirements is improved, but system complexity increases
Solution Approach 1:
The patent segments the uplink control channel resources into different numerology configurations (e.g., 15 kHz, 30 kHz subcarrier spacing) tailored to specific service types. Each numerology configuration is optimized for particular service requirements (eMBB, mMTC, URLLC), allowing the system to manage complexity through structured segmentation while maintaining high adaptability
Solution Approach 2:
The patent creates a universal PUCCH resource allocation framework that can handle multiple numerologies and service types through a unified selection mechanism. The base station and user terminal use standardized signaling to indicate the appropriate numerology and format, enabling multi-functionality without proportionally increasing complexity
Data Source
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AI summary
The present invention is designed so that UL control information can be reported properly in future radio communication systems. A user terminal includes a generation section that generates a UL signal using a resource that is associated with presence or absence of a scheduling request (SR), and a transmission section that transmits the UL signal.