CSI Bit Mapping with Polar Code Reliability Index Assignment
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Solution Overview
Problem
In 5G NR communication, there is no effective method to reasonably map positions of various types of information in CSI reporting, leading to suboptimal performance in channel state information encoding.
Innovation Solution
A method and apparatus for encoding CSI that maps first, second, and third types of information bits according to indexes in a position index set, determining positions for each type based on reliability and bit error ratio, and performs Polar codes encoding to improve Bit Error Ratio (BER) 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 parameter changes by dynamically adjusting the mapping positions of different information types (CRI, RI, PMI, CQI) based on their importance weights and channel conditions. The system changes the assignment of bit positions in the encoded sequence according to varying parameters such as channel quality indicators and information reliability requirements, thereby optimizing coding efficiency while managing mapping complexity.
Solution Approach 2:
The patent implements local quality by assigning different mapping strategies to different information types within the CSI reporting. Each information type (CRI, RI, PMI, CQI) is given specific mapping positions based on its individual importance and reliability requirements, rather than applying a uniform mapping approach. This allows critical information to be placed in more reliable code positions while less critical information occupies other positions.
2Reliability
If padding is applied to make CSI information lengths uniform, then blind detection is reduced, but determination of padding bit lengths and information positions becomes more complex
Solution Approach 1:
The patent applies preliminary action by pre-determining the mapping positions and lengths of different information types before the actual encoding process. The system calculates and establishes the mapping scheme in advance based on the total number of bits to be transmitted and the importance weights of different information types. This preliminary determination simplifies the subsequent encoding process and reduces the complexity of position determination during real-time operation.
3Reliability
If Polar codes encoding is used for control channel, then error correction capability is improved, but mapping of input bits to high reliability indices is required for optimal performance
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the mapping of information bits to Polar code indices based on the reliability requirements of different information types. The system changes the assignment strategy according to parameters such as channel conditions and information importance, mapping critical information bits to indices with higher reliability (lower BER) while less critical bits are mapped to other indices. This adaptive parameter adjustment optimizes the error correction performance of Polar codes for different information types.
Data Source
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.