5G Uplink CSI Mapping With Polar Codes for Fewer Blind Decodes
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Solution Overview
Problem
Current 5G communication systems face challenges in efficiently mapping uplink control information (UCI) to report channel state information (CSI), leading to ambiguity in encoding and increased blind decoding attempts by the base station.
Innovation Solution
A method is introduced to efficiently design a UCI mapping rule using polar codes, where CSI reference signal resource indicators (CRI) and rank indicators (RI) are placed before padding bits, and precoding matrix indicators (PMI) and channel quality indicators (CQI) are placed after, to reduce ambiguity and improve decoding efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional UCI mapping methods are used for CSI reporting, then the system maintains basic compatibility with existing protocols, but ambiguity in encoding increases and blind decoding attempts by the base station increase
Solution Approach 1:
The patent segments the UCI information sequence into distinct parts: CSI information (CRI, RI, PMI, CQI) and padding bits. By clearly defining the structure as CSI information followed by a specific number of padding bits, the segmentation eliminates encoding ambiguity and allows the base station to determine the exact sequence length without multiple blind decoding attempts.
2Loss of information
If the UCI sequence length is extended to include all CSI parameters, then complete channel state information can be reported, but the complexity of identifying the sequence boundary increases
Solution Approach 1:
The patent applies preliminary action by pre-defining the UCI sequence structure with a fixed number of padding bits appended after the CSI information. This predetermined structure allows the base station to easily identify the sequence boundary without complex detection mechanisms, while ensuring all necessary CSI parameters (CRI, RI, PMI, CQI) are included in the reporting.
Data Source
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 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 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.