CSI Feedback Segmentation in VHT MIMO Systems

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Solution Overview

Problem

Current wireless communication systems face challenges in efficiently communicating Channel State Information (CSI) in MIMO systems, particularly in managing large CSI feedback data and optimizing transmission parameters to ensure high throughput and reliability.

Innovation Solution

The method involves a wireless communication system that receives a request for CSI, determines parameters based on included information, and transmits a frame containing the CSI, using techniques like Null Data Packet Announcement (NDPA) and CSI polling to segment and manage CSI feedback, optimizing transmission parameters for each user terminal.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If CSI feedback data is transmitted in a single frame, then transmission simplicity is maintained, but overhead increases and efficiency decreases for large data volumes

Engineering Contradiction:

ImproveCSI transmission efficiencyVSAvoidCSI feedback data volume

Core Design Contradiction:

ProductivityVSQuantity of substance

Solution Approach 1:

The patent segments large CSI feedback data into multiple frames for transmission. The apparatus divides the CSI feedback information into first CSI feedback information and second CSI feedback information, transmitting them in separate frames at different times. This segmentation reduces the overhead of each individual frame and improves transmission efficiency for large data volumes.

Inventive Principle:

Principle #1Segmentation

2Measurement precision

If CSI is transmitted frequently to maintain accuracy, then measurement precision improves, but network overhead increases

Engineering Contradiction:

ImproveCSI accuracyVSAvoidnetwork overhead

Core Design Contradiction:

Measurement precisionVSQuantity of substance

Solution Approach 1:

The patent implements periodic CSI transmission with different frequencies for different types of CSI feedback. Beamforming feedback is transmitted periodically at a first frequency, while other CSI feedback is transmitted periodically at a second frequency. This periodic action maintains measurement precision for critical parameters while reducing overall network overhead through optimized transmission intervals.

Inventive Principle:

Principle #19Periodic action

3Productivity

If transmission parameters are optimized for each user terminal, then data throughput improves, but system complexity increases

Engineering Contradiction:

Improvedata throughputVSAvoidparameter management complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent applies local quality by configuring different transmission parameters for different user terminals and different CSI feedback types. The apparatus determines first transmission parameters for beamforming feedback and second transmission parameters for other CSI feedback, allowing optimization of data throughput for each terminal's specific channel conditions and requirements while managing complexity through structured parameter configuration.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS10090982B2Systems and methods for communication of channel state information

Publication Date: 2018.10.02 QUALCOMM INC

AI summary

Certain aspects of the present disclosure relate to a technique for communicating Channel State Information (CSI) feedback. In some aspects, the CSI feedback is communicated in a very high throughput (VHT) wireless communications system.