NACK Transmission Reliability via PUCCH Power and Beam Configuration
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Solution Overview
Problem
Current wireless communication systems face challenges in ensuring high transmission reliability for negative-acknowledgement (NACK) feedbacks, which are crucial for error correction in hybrid automatic repeat request (HARQ) processes, especially in scenarios requiring ultra-reliable low-latency communications (URLLC).
Innovation Solution
The solution involves configuring user equipment (UE) with a physical control channel (PUCCH) configuration that boosts transmit power and utilizes multiple beams for NACK transmissions, providing higher reliability compared to acknowledgement (ACK) feedbacks. This includes specific transmission power increments and beam configurations to enhance the reliability of NACKs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If NACK feedback is transmitted with standard reliability measures, then device complexity and energy consumption are kept low, but transmission reliability is insufficient for URLLC applications
Solution Approach 1:
The patent applies local quality by configuring different transmission parameters specifically for NACK feedback versus other uplink transmissions. The base station provides separate power control parameters (P0, deltaF) and spatial relation information specifically for PUCCH resources carrying NACK, allowing optimized reliability only where needed without increasing overall system complexity.
Solution Approach 2:
The patent changes transmission parameters dynamically based on feedback type. By providing separate power control parameters (P0-NACK, deltaF-NACK) and spatial relation configurations for NACK transmissions, the system adjusts power levels and beamforming parameters specifically for NACK to achieve higher reliability while maintaining standard operation for other transmissions.
2Reliability
If NACK feedback is transmitted with standard reliability measures, then energy consumption is kept low, but transmission reliability is insufficient for URLLC applications
Solution Approach 1:
The patent changes power control parameters specifically for NACK transmissions by providing separate P0 and deltaF values for NACK feedback. This allows the UE to transmit NACK at higher power levels only when needed for reliability, rather than maintaining high power for all transmissions, thus achieving improved reliability with targeted energy consumption.
3Reliability
If NACK feedback is transmitted with standard reliability measures, then device complexity is kept low, but error correction capability is insufficient for URLLC applications
Solution Approach 1:
The patent applies local quality by providing specific spatial relation information and power control parameters only for PUCCH resources that may carry NACK feedback. This targeted configuration approach enhances error correction capability through optimized power and beamforming without requiring complex system-wide reconfiguration.
Solution Approach 2:
The patent applies preliminary action by pre-configuring power control parameters (P0, deltaF) and spatial relation information for NACK transmissions before actual URLLC data transmission occurs. This allows the UE to immediately use optimized parameters for NACK feedback without real-time computation, reducing latency while maintaining high reliability.
4Reliability
If NACK feedback is transmitted with standard reliability measures, then latency is kept low, but block error rates remain high requiring higher-layer retransmission
Solution Approach 1:
The patent changes power control parameters specifically for NACK transmissions by providing separate P0 and deltaF values for NACK feedback. This allows the UE to transmit NACK at higher power levels only when needed for reliability, rather than maintaining high power for all transmissions, thus achieving improved reliability with targeted energy consumption.
Data Source
AI summary
Wireless communications systems and methods related to acknowledgement/negative-acknowledgement (ACK/NACK) transmissions with different reliability levels are provided. A user equipment (UE) receives, from a base station (BS), a negative acknowledgement (NACK) transmission configuration. The UE receives, from the BS, a data transmission. The UE transmits, to the BS, a physical uplink control channel (PUCCH) signal including a NACK for the data transmission based on the received NACK transmission configuration. Other aspects and features are also described.