PUCCH Uplink Control 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, particularly for HARQ-ACK and CSI, due to joint coding limitations.
Innovation Solution
Implementing separate encoding for HARQ-ACK and CSI, allowing these encoded bit sequences to be mapped to the same uplink control channel, enabling different quality requirements to be met for each.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the number of component carriers is expanded to six or more, then band expansion is achieved, but the quality of transmission for UCI cannot be appropriately ensured due to joint coding limitations
Solution Approach 1:
The patent divides the encoding process into separate encoding for HARQ-ACK information and CSI, rather than joint encoding. This segmentation allows each type of control information to be encoded independently with appropriate coding rates and methods, ensuring that both can be reliably transmitted even when the number of component carriers is expanded to six or more.
2Device complexity
If joint coding is used for HARQ-ACK and CSI, then encoding complexity is reduced, but different quality requirements for each cannot be satisfied
Solution Approach 1:
The patent applies segmentation by separating the encoding of HARQ-ACK and CSI into independent processes. Each encoding process can be optimized according to its specific requirements (e.g., HARQ-ACK may use more robust coding), thereby satisfying different quality requirements while maintaining manageable overall complexity through standardized separate encoding procedures.
Data Source
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.