Channel State Information Feedback Compression in Wireless Communication

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Solution Overview

Problem

The overhead of reporting channel state information (CSI) in 5G NR radio networks is excessive due to the large number of frequency bands and spatial streams, which increases the complexity and power consumption of user devices.

Innovation Solution

The method involves compressing the coefficients of precoding vectors by determining frequency domain (FD) unit basis vectors and FD basis vector coefficients, allowing for reduced overhead in CSI reporting by only reporting a subset of compressed coefficients based on specific criteria.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If the number of utilized frequency bands and transmit/receive antennas is increased to enhance mobile broadband performance, then the performance and efficiency of wireless communication link is improved, but the overhead of reporting channel state information increases

Engineering Contradiction:

Improvewireless communication performanceVSAvoidCSI reporting overhead

Core Design Contradiction:

ProductivityVSQuantity of substance

Solution Approach 1:

The patent segments the precoding vector coefficients into two parts: wideband coefficients that are reported periodically, and subband-specific coefficients that are reported only when necessary. This segmentation allows the system to maintain high performance with multiple frequency bands and antennas while reducing the overall reporting overhead by dividing the CSI feedback into manageable segments.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies partial action by reporting only a subset of coefficients - specifically, the wideband coefficients and selected subband coefficients that meet certain criteria. Instead of reporting all coefficients for every frequency band and antenna combination, the system selectively reports only the necessary portions, thereby reducing overhead while maintaining communication performance.

Inventive Principle:

Principle #16Partial or excessive action

2Productivity

If the number of utilized frequency bands and transmit/receive antennas is increased to enhance mobile broadband performance, then the efficiency of wireless communication link is improved, but the complexity of user devices increases

Engineering Contradiction:

Improvewireless communication efficiencyVSAvoiduser device complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent segments the CSI reporting into wideband and subband components, which simplifies the processing requirements at the user device. By dividing the complex task of CSI calculation and reporting into smaller, more manageable segments, the device complexity is reduced while still supporting multiple frequency bands and antennas for high efficiency communication.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent reduces device complexity by implementing partial action - the user device only needs to calculate and report certain coefficients (wideband and selected subband coefficients) rather than all possible coefficients. This selective reporting approach significantly reduces the computational burden and complexity at the user device while maintaining the efficiency benefits of using multiple frequency bands and antennas.

Inventive Principle:

Principle #16Partial or excessive action

3Reliability

If the number of utilized frequency bands and transmit/receive antennas is increased to enhance mobile broadband performance, then the reliability of wireless communication link is improved, but the power consumption of user devices increases

Engineering Contradiction:

Improvewireless communication reliabilityVSAvoiduser device power consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent segments the CSI feedback process into wideband and subband reporting, which reduces the amount of data processing and transmission required at the user device. This segmentation lowers power consumption while maintaining the reliability benefits of using multiple frequency bands and antennas for diverse communication paths.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent implements partial action by having the user device report only a subset of coefficients rather than all coefficients. This selective reporting significantly reduces the power consumption associated with CSI calculation, processing, and transmission, while the system still maintains reliable communication through the use of multiple frequency bands and antennas.

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS12212384B2Channel state information feedback in wireless communication

Publication Date: 2025.01.28 ZTE CORP

AI summary

Methods, systems, and devices for reducing channel state information feedback channel overhead by compressing coefficients of precoding vectors and reporting a subset of the compressed coefficients based on several parameters including network-signaled parameters. Some embodiments may be used in wireless communication embodiments in which channel state information from many layers and many frequency domain units need to be reported.