CSI Feedback Segmentation in VHT Wireless Systems

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Solution Overview

Problem

Current wireless communication systems face challenges in efficiently communicating Channel State Information (CSI) due to large data sizes that exceed the capacity of single Media Access Control (MAC) protocol data units or Physical Layer (PHY) protocol data units, leading to overhead and inefficiencies in CSI feedback processes.

Innovation Solution

A method is introduced to segment CSI feedback, utilizing Null Data Packet Announcements (NDPA) and CSI polls to break down CSI into manageable portions, allowing for efficient communication between access points and user stations, with specific packet formats and protocols supporting this segmentation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of information

If CSI feedback is transmitted as a single large data unit, then the completeness of information is preserved, but the transmission capacity is exceeded and overhead increases

Engineering Contradiction:

ImproveCSI feedback completenessVSAvoidMAC/PHY protocol data unit capacity

Core Design Contradiction:

Loss of informationVSDevice complexity

Solution Approach 1:

The patent divides the CSI feedback into multiple segments that can be transmitted separately. Each segment contains a portion of the CSI data, allowing the total feedback to be conveyed through multiple smaller transmission units rather than a single oversized unit, thereby resolving the capacity limitation while maintaining information completeness.

Inventive Principle:

Principle #1Segmentation

2Productivity

If CSI feedback is segmented into multiple units, then the transmission capacity is respected and overhead is reduced, but the complexity of the feedback mechanism increases

Engineering Contradiction:

ImproveCSI feedback efficiencyVSAvoidsegmentation protocol complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent implements a feedback mechanism where the receiver acknowledges received CSI segments and indicates which segments are missing or erroneous. This allows the transmitter to selectively retransmit only the problematic segments rather than the entire feedback message, improving efficiency while managing the complexity through intelligent feedback loops.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent uses Null Data Packets (NDP) to preliminarily establish the transmission parameters and prepare the CSI feedback structure before actual data transmission begins. This preliminary setup includes defining the segmentation scheme and allocating resources, which simplifies the subsequent segmented transmission process.

Inventive Principle:

Principle #10Preliminary action

3Ease of operation

If traditional single-unit CSI transmission is used, then the protocol simplicity is maintained, but the network resource usage becomes inefficient

Engineering Contradiction:

Improveprotocol simplicityVSAvoidnetwork resource efficiency

Core Design Contradiction:

Ease of operationVSLoss of energy

Solution Approach 1:

The patent transmits only the necessary portions of CSI feedback in each segment rather than always sending complete feedback. This partial transmission approach allows the system to adapt to varying network conditions and reduce energy consumption when full feedback is not required, while maintaining protocol simplicity through selective activation of segmentation modes.

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentEP2622767B1Systems and methods for communication of channel state information

Publication Date: 2019.03.06 QUALCOMM INC

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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.