PUCCH Repetition Number Configuration Across UCI Resources
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Solution Overview
Problem
The existing NR Release 15 protocol lacks flexibility in configuring the repetition number of PUCCH (Physical Uplink Control Channel) transmissions, limiting its effectiveness in various scenarios.
Innovation Solution
The repetition number of PUCCH is indicated per PUCCH resource or resource group through RRC signaling or MAC CE, allowing different configurations based on the type of UCI (Uplink Control Information) carried, such as periodic CSI, SR, HARQ-ACK, and semi-persistent CSI, and is also indicated in DCI for HARQ-ACK corresponding to DL scheduling, enhancing flexibility and reducing latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the repetition number of PUCCH is configured per PUCCH format in NR Release 15, then the configuration is simple, but the flexibility is limited
Solution Approach 1:
The patent segments the repetition number configuration by separating it into two independent dimensions: PUCCH format-specific configuration and PUCCH resource-specific configuration. This allows the repetition number to be indicated at multiple levels (format level and resource level), enabling flexible adaptation to different scenarios without requiring complete reconfiguration of the entire PUCCH system.
Solution Approach 2:
The patent introduces dynamic configuration capabilities by allowing the repetition number to be indicated not only through static RRC signaling but also through dynamic DCI signaling. This enables the repetition number to be adjusted in real-time based on channel conditions and traffic requirements, transforming the previously static configuration into a dynamic one that can adapt to changing conditions.
2Loss of time
If the repetition number is indicated through RRC signaling for all UCI types, then the configuration is comprehensive, but the latency is high
Solution Approach 1:
The patent uses RRC signaling to pre-configure PUCCH resources and parameters including the repetition number before actual transmission is needed. This preliminary configuration establishes the baseline settings that can be quickly activated or modified later through faster signaling mechanisms like MAC CE or DCI, reducing the latency for time-critical configurations.
Solution Approach 2:
The patent introduces MAC CE as an intermediary signaling mechanism between the slow RRC configuration and the fast DCI signaling. MAC CE can activate or modify PUCCH repetition configurations with moderate latency, serving as a middle ground that balances the comprehensiveness of RRC signaling with the speed requirements of dynamic adjustments.
3Adaptability or versatility
If only long PUCCH formats (1, 3, 4) are configured for repetition, then the configuration is restricted, but the system complexity is reduced
Solution Approach 1:
The patent extends the repetition capability from only long PUCCH formats (1, 3, 4) to include short PUCCH formats (0, 2) as well. By making the repetition mechanism universal across all PUCCH formats, the system gains multi-functionality where any PUCCH format can be configured for repetition based on specific resource indications, rather than being restricted to specific format types.
Solution Approach 2:
The patent applies different configuration approaches to different PUCCH formats through the PUCCH resource indication mechanism. Each PUCCH resource can be individually configured with repetition parameters appropriate to its format and usage scenario, allowing short formats to use repetition when needed while long formats use their established repetition mechanisms, optimizing each format's performance for its specific requirements.
Data Source
AI summary
Methods and apparatuses for indicating repetition number of PUCCH are disclosed. A base unit comprises a transmitter that transmits a configuration containing an indication of a repetition number of PUCCH, wherein the configuration is determined according to a type of UCI carried in the PUCCH; and a receiver that receives the PUCCH repeatedly with the repetition number.