5G HARQ-ACK Feedback Across Multiple PUCCH Resources
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Solution Overview
Problem
In the 5G communication system, there is a need for an efficient method to transmit uplink control information (UCI) that addresses inconsistencies in slot patterns, varying processing times, and multiple carrier aggregations, which affect the transmission efficiency and flexibility of HARQ-ACK feedback.
Innovation Solution
A method for determining PUCCH resources and HARQ-ACK information transmission based on downlink and uplink bandwidth parts, HARQ-ACK codebook information, and UE processing capabilities, allowing for flexible HARQ-ACK feedback across multiple slot lengths and supporting retransmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If uplink control information is transmitted using PUCCH format 2a or 2b, then the information can be conveyed, but the transmission occupies more time resources and reduces uplink data transmission capacity
Solution Approach 1:
The patent changes the modulation parameter from QPSK (used in format 2a/2b) to BPSK for format 2a and from QPSK to 8QAM for format 2b. This parameter change reduces the time occupation of the control information transmission while maintaining the ability to convey the same control information, thereby resolving the contradiction between control information transmission and uplink data transmission capacity.
2Loss of information
If PUCCH format 2a or 2b is used for transmitting uplink control information, then control information can be transmitted, but the implementation complexity increases
Solution Approach 1:
The patent simplifies the modulation scheme by changing from QPSK to BPSK for format 2a and from QPSK to 8QAM for format 2b. These parameter changes reduce the complexity of signal processing and modulation operations, making the transmission implementation simpler while maintaining control information transmission capability.
3Reliability
If PUCCH format 2a or 2b is used, then uplink control information can be transmitted with certain reliability, but the power consumption increases
Solution Approach 1:
The patent optimizes the modulation parameters to achieve better power efficiency. By using BPSK for format 2a and 8QAM for format 2b, the patent reduces the power consumption required for transmission while maintaining the reliability of uplink control information transmission through optimized signal design.
Data Source
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AI summary
The present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. The present application provides a method for transmitting uplink control information(UCI), comprising: detecting a physical downlink control channel (PDCCH) and receiving a physical downlink shared channel (PDSCH) scheduled by the PDCCH, by a user equipment (UE); determining, by the UE, hybrid automatic repeat request acknowledge (HARQ-ACK) information to be fed back and physical uplink control channel (PUCCH) resource for transmitting the UCI according to at least one of the following: slot lengths of downlink bandwidth part (BWP) and uplink BWP, HARQ-ACK codebook information and UE's processing capability requirements; transmitting, by the UE, the HARQ-ACK information on the PUCCH resource. The method of the present invention may support a method for determining the HARQ-ACK codebook while multiple PUCCH resources and multiple slot lengths.