Variable-Length CSI Coding for Efficient High-Band Reporting

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Solution Overview

Problem

Existing wireless communication systems face challenges in efficiently reporting Channel State Information (CSI) due to limitations in current coding methods, which affect radio interface efficiency and coverage, especially in high-frequency bands like 28 GHz and 60 GHz.

Innovation Solution

Implementing a variable-length (VL) encoder to encode CSI coefficient values as VL codes, enabling efficient reporting through a UE and BS that determine and transmit/receive these codes, enhancing CSI reporting accuracy and efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If uniform coding is used for CSI reporting, then the coding process is simple, but the reporting efficiency and accuracy are insufficient for high-frequency bands

Engineering Contradiction:

ImproveCSI reporting efficiencyVSAvoidcoding process complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent applies local quality by using variable-length coding where different CSI coefficients are encoded with different lengths based on their importance and distribution characteristics. Significant coefficients receive more bits while less significant ones receive fewer bits, optimizing the balance between reporting accuracy and efficiency without requiring complex uniform coding across all coefficients.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent changes the coding parameter from uniform fixed-length coding to variable-length coding. By adjusting the code length parameter dynamically based on coefficient characteristics, the system achieves higher reporting efficiency while maintaining manageable complexity through standardized variable-length encoding procedures.

Inventive Principle:

Principle #35Parameter changes

2Measurement precision

If more CSI coefficients are reported to improve accuracy, then the reporting accuracy improves, but the overhead and complexity increase

Engineering Contradiction:

ImproveCSI reporting accuracyVSAvoidreporting overhead

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent extracts only the most significant CSI coefficients for reporting rather than transmitting all coefficients uniformly. By identifying and reporting only the essential coefficients that contribute most to channel state characterization, the system achieves high accuracy with reduced overhead and lower complexity.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent applies local quality by differentiating the treatment of different coefficients - significant coefficients are reported with higher precision using variable-length codes while less significant coefficients are either omitted or reported with lower precision, optimizing the accuracy-overhead tradeoff.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS20250343647A1Non-uniform coding for CSI reporting

Publication Date: 2025.11.06 SAMSUNG ELECTRONICS CO LTD

AI summary

Apparatuses and methods for efficient reporting. A method performed by a user equipment (UE) includes receiving information about channel state information (CSI) and determining the coefficient values. The CSI includes coefficient values that are encoded based on a variable-length (VL) encoder {(νk, Ak)} where a coefficient value Ak is encoded as a VL code νk, k=0, . . . , NVL−1, and NVL is a number of VL codes. The method further includes determining VL codes of the coefficient values based on the VL encoder and transmitting a CSI report including at least one indicator indicating the VL codes of the coefficient values.