Wireless Communication Device for Higher-Rate CSI Transmission

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Solution Overview

Problem

Existing Wi-Fi based sensing applications suffer from degraded performance due to the limited amount of channel state information (CSI) data transmitted at the basic physical layer (PHY) data rate, which hinders the effective utilization of CSI for enhancing application performance.

Innovation Solution

A wireless communication device and method that utilize a higher physical layer (PHY) data rate for CSI transmission by transmitting frames carrying CSI data at a specific PHY data rate higher than the basic PHY data rate for normal acknowledgement frames, allowing for increased subcarrier usage and improved CSI data transmission.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the basic PHY data rate is used for ACK frame transmission, then the bit error rate is low and the ACK frame is reliably received, but the CSI data amount available to the Wi-Fi based sensing application is low, resulting in degradation of sensing application performance

Engineering Contradiction:

ImproveACK frame reception reliabilityVSAvoidCSI data amount

Core Design Contradiction:

ReliabilityVSLoss of information

Solution Approach 1:

The patent changes the PHY data rate parameter from the basic rate to a higher data rate when transmitting ACK frames that carry CSI information. This parameter change allows more subcarriers to be used for CSI transmission, increasing the CSI data amount while maintaining acceptable reliability through other mechanisms.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If the basic PHY data rate is used for CSI transmission, then the transmission is reliable, but the amount of usable subcarriers is limited (e.g., 48 usable subcarriers among total 52 subcarriers), restricting the CSI data capacity

Engineering Contradiction:

Improvetransmission reliabilityVSAvoidCSI data capacity

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The patent changes the PHY data rate parameter to a higher value, which enables the use of more subcarriers for CSI transmission. This increases the CSI data capacity from the limited amount available at basic data rate to a significantly larger amount, improving sensing application performance.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent utilizes the data rate dimension as an additional degree of freedom for CSI transmission. By operating at a higher data rate, the system accesses additional subcarriers that would not be available at the basic data rate, effectively expanding the transmission capacity in a new dimension.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Data Source

PatentUS12408084B2Wireless communication device using higher physical layer data rate for channel state information transmission and associated wireless communication method

Publication Date: 2025.09.02 MEDIATEK INC

AI summary

A wireless communication device includes a channel state information (CSI) estimation circuit and a transmitter (TX) circuit. The CSI estimation circuit performs CSI estimation for generating CSI data. The TX circuit transmits a first frame at a specific physical layer (PHY) data rate to another wireless communication device. The first frame carries the CSI data. The specific PHY data rate is higher than a basic PHY data rate for normal acknowledgement (ACK) frame transmission.