CSI Bit Mapping in Polar Codes for Reliable 5G NR Reporting
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Solution Overview
Problem
In 5G NR communication systems, there is no effective method to reasonably map positions of various types of information in CSI reporting, leading to suboptimal performance due to differing lengths and reliabilities of CSI information bits.
Innovation Solution
A method for encoding CSI that maps different types of information bits to specific positions based on their reliability and bit error ratio (BER), using Polar codes encoding and determining the positions through density evolution or Gaussian approximation, ensuring that information bits with higher reliability are placed at optimal positions to improve decoding performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If joint coding mechanism is employed for CSI reporting with different information types, then coding efficiency is improved, but mapping positions of various types of information cannot be reasonably determined
Solution Approach 1:
The patent applies local quality by assigning different information types (CRI, RI, PMI, CQI) to different position sets based on their specific characteristics and reliability requirements. Each information type is mapped to appropriate positions within the mother code sequence, ensuring that critical information is placed in positions with higher decoding reliability while less critical information occupies other positions.
2Reliability
If CSI information is padded to have same length in different situations, then blind detection is reduced, but determination of padding bits length and information positions becomes complex
Solution Approach 1:
The patent applies preliminary action by pre-defining multiple position sets for different information types before actual CSI reporting. These position sets are determined in advance based on information type and length, allowing the system to quickly map information to appropriate positions without complex real-time calculations. The padding bits are also pre-positioned in specific sets, simplifying the overall mapping process.
3Reliability
If Polar codes encoding is used for control channel, then encoding performance is improved, but bit error ratio varies for different input bit indexes requiring optimal mapping
Solution Approach 1:
The patent applies parameter changes by utilizing the different reliability characteristics of various bit positions in Polar codes encoding. The system changes the mapping parameters by assigning information types to different position sets that correspond to different reliability levels. This ensures that information requiring higher reliability is mapped to positions with lower bit error ratios, while less critical information is mapped to positions with higher bit error ratios.
Data Source
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AI summary
Provided is a method and an apparatus for encoding CSI, a storage medium, and a processor, where the method includes: placing a first type of information bits of the CSI in a first type of position indexes of the position index set, and determining, from the indexes other than the first type of position indexes determined by the first type of information bits in the position index set, indexes of the second type of information bits of the CSI, indexes of the third type of information bits of the CSI, and indexes of the fourth type of information bits in the position index set; or placing the fourth type of information bits in the fourth type of position indexes of the position index set, and determining indexes of the first type of information bits, indexes of the second type of information bits, and indexes of the third type of information bits of the CSI in the position index set from indexes other than the fourth type of position indexes determined by the fourth type of information bits in the position index set. The present disclosure solves the problem that positions of various types of information in the CSI reporting cannot be reasonably mapped in the related art.