CSI Bit Mapping with Position Index Sets for Lower BLER
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Solution Overview
Problem
In 5G NR communication systems, the positions of various types of information in CSI reporting cannot be reasonably mapped, leading to suboptimal performance in CSI reporting.
Innovation Solution
A method and apparatus for encoding CSI that maps CSI and additional information bits according to indexes in a position index set, allowing for the determination of optimal positions for different types of information bits, such as CRI, RI, PMI, and CQI, to improve encoding performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If joint coding mechanism is employed for CSI reporting, then encoding efficiency is improved, but mapping of various types of information bits becomes complex and suboptimal
Solution Approach 1:
The patent segments the CSI information bits into different types (first type, second type, third type, and fourth type) and assigns each type to specific position indexes in the codebook. This segmentation allows the encoder to efficiently process joint coding while the predefined type-based mapping simplifies the complexity of determining positions for different information bits.
Solution Approach 2:
The patent applies local quality by assigning different mapping rules to different types of information bits based on their specific characteristics. Each type of information bit (CRI, RI, PMI, CQI) has designated position indexes in the codebook, allowing optimal placement of each information type according to its reliability requirements and coding properties.
2Reliability
If padding is applied to unify CSI length, then blind detection is reduced, but determination of padding bits and information positions becomes more complex
Solution Approach 1:
The patent performs preliminary action by pre-defining position indexes for different types of information bits in the codebook before encoding. This preliminary mapping structure allows the system to determine positions of information bits and calculate required padding bits more systematically, reducing the complexity of the determination process while maintaining unified length for blind detection reduction.
3Reliability
If Polar codes encoding is used for control channel, then error protection performance is improved, but mapping of input bits to high reliability indexes is required
Solution Approach 1:
The patent applies local quality by mapping different types of information bits to different position indexes in the Polar code generator matrix based on their specific reliability requirements. The first type of information bits are mapped to indexes with higher reliability, while other information types are mapped to appropriate positions, optimizing error protection for each information type without requiring complex adaptive mapping.
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.