Polar-Code UCI Mapping for Ambiguity-Free CSI Feedback
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems face challenges in efficiently mapping uplink control information (UCI) for reporting channel state information (CSI), particularly in 5G networks, where ambiguity in UCI encoding can lead to increased blind decoding attempts and decoding errors.
Innovation Solution
The method involves designing an efficient UCI mapping rule for encoding polar codes, where UCI elements like CRI, RI, and CQI are encoded before padding bits, and the order of encoding is optimized based on the number of CSI-RS ports and rank, to reduce ambiguity and improve decoding reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UCI elements are encoded without a specific mapping rule, then the encoding process is simple, but decoding ambiguity increases and decoding reliability decreases
Solution Approach 1:
The patent applies preliminary action by establishing a predetermined mapping rule that defines the encoding order of UCI elements (CRI, RI, CQI) and padding bits before the actual encoding process. This pre-defined sequence eliminates decoding ambiguity without requiring complex real-time decision-making during encoding, thus improving reliability while maintaining encoding simplicity.
2Reliability
If blind decoding attempts are increased to handle ambiguity, then decoding coverage is improved, but the number of attempts and processing time increase
Solution Approach 1:
By pre-defining the encoding order of UCI elements and padding bits through a specific mapping rule, the patent eliminates decoding ambiguity at the source. This prevents the need for multiple blind decoding attempts, thereby reducing decoding time while maintaining high decoding success rate.
3Measurement precision
If UCI mapping rule is optimized based on CSI-RS ports and rank, then CSI reporting accuracy is improved, but the complexity of determining encoding order increases
Solution Approach 1:
The patent uses parameter changes by adjusting the encoding order of UCI elements based on specific system parameters (number of CSI-RS ports and rank). Different parameter combinations trigger different predefined mapping rules, allowing the system to optimize CSI reporting accuracy for various configurations without requiring complex real-time calculations.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The present disclosure relates to a communication method and system for converging a 5th-Ggeneration (5G) communication system for supporting higher data rates beyond a 4th-Ggeneration (4G) system with a technology for Internet of Tthings (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the loT-related technology, such as smart homes, smart buildings, smart cities, smart cars, connected cars, health care, digital education, smart retail, security, and safety services. A method of transmitting uplink control information in a wireless communication system is provided. The method includes receiving channel state information (CSI) feedback configuration information from a base station, generating (CSI) including at least one of a CSI reference signal resource indicator (CRI), a rank indicator (RI), a precoding matrix indicator (PMI), or a channel quality indicator (CQI) based on the CSI feedback configuration information, identifying an information sequence including the CSI, encoding the information sequence using a polar code, and transmitting the encoded information sequence to a base station. The CRI and the RI are placed before padding bits in the information sequence and the PMI and the CQI are placed after the padding bits in the information sequence.