PUCCH UCI Encoding for Multi-Carrier HARQ-ACK and CSI
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Solution Overview
Problem
In LTE systems, expanding the number of component carriers per user terminal beyond five poses challenges in ensuring appropriate quality of transmission for uplink control information, including HARQ-ACK and CSI, due to joint encoding methods used in existing systems.
Innovation Solution
Implementing a new PUCCH format that separately encodes HARQ-ACK and CSI, allowing for different error correction coding rates to meet the distinct quality requirements of each, ensuring reliable transmission even with an increased number of component carriers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of component carriers is expanded beyond five, then the system bandwidth and data rate are improved, but the transmission quality of uplink control information deteriorates due to joint encoding limitations
Solution Approach 1:
The patent segments the uplink control information into two separate encoding streams: HARQ-ACK information and CSI information. Each segment is encoded independently with its own coding rate, allowing optimized protection for each type of control information. This segmentation resolves the contradiction by enabling the system to support more component carriers while maintaining reliable transmission of control information through separate encoding paths.
2Device complexity
If joint encoding is used for HARQ-ACK and CSI, then the encoding process is simplified, but the transmission quality cannot meet different requirements of each information type
Solution Approach 1:
The patent divides the encoding process into separate segments for HARQ-ACK and CSI information. Each segment undergoes independent channel coding with appropriate coding rates selected based on the specific requirements of that information type. This segmentation approach resolves the contradiction by accepting increased encoding complexity as a necessary trade-off to achieve differentiated quality transmission for different control information types.
Solution Approach 2:
The patent applies different coding rates to different segments of control information based on their specific reliability requirements. HARQ-ACK information, which requires high reliability for data retransmission control, can be assigned a lower coding rate (more redundancy), while CSI information can use a higher coding rate. This local quality differentiation resolves the contradiction between encoding simplicity and transmission quality by allowing optimized encoding parameters for each information type.
Data Source
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AI summary
The present invention is designed so that, even when the number of component carriers (CC) that can be configured per user terminal is expanded more than in existing systems, UCI including at least HARQ-ACK and CSI can be transmitted with appropriate quality. The user terminal of the present invention separately encodes at least one CC's HARQ-ACK and at least one CC's CSI. The user terminal maps the encoded bit sequence of the HARQ-ACK and the encoded bit sequence of the CSI to radio resources constituting the same PUCCH and transmits the PUCCH.