PUCCH Repetition Configuration for Multi-TRP Reliability
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G NR, face challenges in enhancing the reliability of physical uplink control channels (PUCCH) for multi-TRP operation, including dynamic PDSCH aggregation and beam configuration, which affect the reliability and efficiency of data transmission.
Innovation Solution
The use of DCI to configure dynamic PUCCH repetition, introduce new DCI fields for PUCCH resource indicators, and enhance PUCCH beam configuration by allowing multiple beams and default beam settings, ensuring reliable PUCCH transmission across various formats and scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PUCCH repetition is configured for multi-TRP operation, then reliability of control channel transmission is improved, but device complexity and configuration overhead increase
Solution Approach 1:
The patent introduces dynamic PUCCH repetition configuration where the number of repetitions and beam configurations are adjusted based on real-time channel conditions and traffic requirements. The gNB can dynamically modify repetition factors and beam switching patterns through DCI signaling, allowing the system to adapt PUCCH transmission parameters rather than using fixed configurations, thus improving reliability without permanent complexity increase
Solution Approach 2:
The patent changes key transmission parameters including repetition factor, beam index, and spatial relation information to optimize PUCCH reliability. By modifying these parameters dynamically based on channel quality indicators and multi-TRP coordination requirements, the system achieves enhanced reliability while managing complexity through parameter optimization rather than structural complexity
2Adaptability or versatility
If multiple beams are configured for PUCCH transmission, then adaptability and reliability in multi-TRP environments improve, but device complexity increases
Solution Approach 1:
The patent segments the beam configuration into multiple spatial relation information sets, each associated with different TRPs and beam directions. Instead of managing all beams simultaneously as a single complex configuration, the system divides beam management into separate, manageable segments that can be independently configured and activated based on which TRP is currently serving the UE
Solution Approach 2:
The patent pre-configures multiple spatial relation information sets and beam candidates before actual PUCCH transmission begins. These preliminary configurations include pre-defined beam indices, spatial relations, and associated TRP identifiers that are prepared in advance through RRC signaling, reducing the complexity of real-time beam management during active transmission
3Productivity
If dynamic PUCCH repetition is implemented, then data transmission efficiency improves, but processing overhead and complexity increase
Solution Approach 1:
The patent implements feedback mechanisms where the gNB monitors PUCCH transmission quality and channel conditions, then provides feedback through DCI signaling to adjust repetition factors and beam configurations. This closed-loop feedback system optimizes data transmission efficiency by adapting to actual channel conditions while managing processing overhead through intelligent, condition-based adjustments rather than exhaustive processing
Data Source
AI summary
Techniques for physical uplink control channel (PUCCH) operation with multiple transmission and reception point (multi-TRP) are disclosed. In some embodiments, determining PUCCH transmission repetition may include determining that an original PUCCH transmission overlaps a slot boundary between a first slot for PUCCH transmission and a second slot for PUCCH transmission, and configuring a PUCCH repetition of the original PUCCH transmission. The PUCCH repetition may include one or more symbols of the original PUCCH transmission and may be located in one or more slots other than the first slot and the second slot. The PUCCH repetition may be configured by a downlink control information (DCI) configuration that includes a physical downlink shared channel to hybrid automatic repeat request acknowledgement feedback (PDSCH-to-HARQ_feedback) timing indicator, a PUCCH repetition number field that configures a number of transmissions of the PUCCH repetition, or a PUCCH resource indicator field that configures a number of transmissions of the PUCCH repetition.