Differentiated PUCCH Configurations for NACK Detection Reliability
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Solution Overview
Problem
In mobile communications, especially for New Radio (NR) ultra-reliable and low latency communications (URLLC), there is a challenge in ensuring high reliability of downlink transmission due to misinterpretation of feedback indications such as ACK and NACK signals by the network apparatus, leading to potential missed re-transmissions of downlink signals.
Innovation Solution
The solution involves configuring user equipment (UE) to transmit ACK and NACK signals using different configurations on the physical uplink control channel (PUCCH), such as varying transmission power levels, resource blocks, time intervals, and coding rates, to enhance the differentiation and reliability of NACK signals, thereby reducing the NACK-to-ACK error rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ACK and NACK signals are transmitted using the same configuration, then the system complexity is low and ease of operation is maintained, but the reliability of downlink transmission deteriorates due to misinterpretation of feedback indications
Solution Approach 1:
The feedback transmission is segmented into separate configurations for ACK and NACK signals. The UE determines a first configuration for ACK transmission and a second configuration for NACK transmission, allowing differentiated treatment of positive and negative acknowledgments to prevent misinterpretation
Solution Approach 2:
Different quality parameters are applied locally to ACK and NACK transmissions. The first configuration and second configuration may include different transmission power levels, resource blocks, time intervals, or coding rates, optimizing each feedback type for its specific reliability requirements
2Reliability
If different configurations are used for ACK and NACK transmission, then the reliability of feedback indication improves, but the device complexity and configuration management burden increase
Solution Approach 1:
The UE autonomously determines the first and second configurations for ACK and NACK transmission based on pre-configured parameters and current channel conditions. This self-service approach reduces the need for extensive network coordination and simplifies configuration management
Solution Approach 2:
Configuration parameters for ACK and NACK transmission are pre-configured by the network before actual feedback transmission occurs. The UE uses these pre-configured parameters to quickly determine appropriate configurations without real-time negotiation, reducing operational complexity
Data Source
AI summary
Various solutions for uplink control channel design for high reliability transmission with respect to user equipment and network apparatus in mobile communications are described. An apparatus may receive a downlink signal from a network node. The apparatus may determine a first configuration to transmit an acknowledgement (ACK). The apparatus may determine a second configuration to transmit a negative acknowledgement (NACK). The apparatus may transmit the NACK to the network node in response to unsuccessful detection of the downlink signal. The second configuration may be different from the first configuration.