PUCCH Transmission Power Control for HARQ-ACK Prioritization
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing transmission power for physical uplink control channels (PUCCH) due to the lack of effective methods for determining power based on hybrid automatic retransmit request (HARQ)-acknowledgment (ACK) information and priority between multiple uplink control information (UCI) services.
Innovation Solution
A method is introduced where the transmission power of a PUCCH is determined by considering the state of HARQ-ACK information and priority between different services, with increased power allocated when a higher percentage of HARQ-ACK bits are in the NACK state or when specific services have higher priority, and power is adjusted by dropping lower-priority HARQ-ACK bits if the maximum power is exceeded.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transmission power of PUCCH is increased to improve reliability of HARQ-ACK transmission, then transmission errors are reduced, but power consumption increases and power efficiency deteriorates
Solution Approach 1:
The patent dynamically adjusts the transmission power parameter of PUCCH based on the actual HARQ-ACK state (number of NACK bits) and service priority. When NACK ratio is high or service priority is high, transmission power is increased to ensure reliability. When NACK ratio is low or service priority is low, transmission power is reduced to save energy. This conditional parameter adjustment resolves the contradiction between maintaining high reliability and improving power efficiency.
2Reliability
If transmission power is uniformly allocated to all HARQ-ACK bits, then transmission reliability is maintained, but power efficiency deteriorates due to unnecessary high power allocation for low-priority services
Solution Approach 1:
The patent applies different transmission power levels to different HARQ-ACK bits based on their corresponding service priorities and NACK states. High-priority services (e.g., URLLC) and NACK bits receive higher power allocation, while low-priority services receive lower power allocation. This localized differentiation of power quality ensures reliable transmission for critical data while reducing unnecessary power consumption for non-critical data, resolving the contradiction between uniform reliability and power efficiency.
3Loss of information
If all HARQ-ACK bits are transmitted simultaneously, then complete feedback information is provided, but transmission reliability deteriorates when maximum power is exceeded due to power allocation conflicts
Solution Approach 1:
When the total transmission power required for all HARQ-ACK bits exceeds the maximum available power, the patent extracts and prioritizes high-priority HARQ-ACK bits (such as those corresponding to URLLC services or NACK states) for transmission at full power. Lower-priority bits are either transmitted at reduced power or dropped. This selective extraction and prioritization ensures that the most critical feedback information is transmitted reliably while managing power constraints, resolving the contradiction between information completeness and transmission reliability.
Data Source
AI summary
The present specification suggests a method for transmitting an uplink channel in a wireless communication system and a device supporting same. More particularly, a method for transmitting, by a terminal, a physical uplink control channel (PUCCH) in a wireless communication system, comprises the steps of: receiving a physical uplink shared channel (PDSCH) from a base station; and transmitting, to the base station, the PUCCH including hybrid automatic retransmit request (HARQ)-acknowledgment (ACK) information for the PDSCH, wherein the PDSCH includes a first PDSCH and a second PDSCH, and the transmission power of the PUCCH is determined on the basis of a priority between the first PDSCH and the second PDSCH and/or a bit configuration of the HARQ-ACK information.