Measurement Device MCS Feedback for Arbitrary Modulation

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Solution Overview

Problem

Measuring devices face difficulties in characterizing devices under measurement with arbitrary modulation schemes or coding rates, particularly in next-generation wireless LAN standards like IEEE 802.11ac, due to changes in modulation and coding scheme standards.

Innovation Solution

A measurement device and method that includes frame reception, determination, and notification signal processing to ensure the device under measurement retransmits frames with adjusted modulation and coding rates until they meet predetermined conditions, increasing delivery probability and allowing for characterization with arbitrary schemes and rates.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the device under measurement transmits frames with arbitrary modulation schemes and coding rates, then measurement flexibility is improved, but compatibility with next-generation wireless LAN standards deteriorates

Engineering Contradiction:

Improvemeasurement flexibilityVSAvoidstandard compatibility

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The measurement device dynamically adjusts the MCS index based on the relationship between the first MCS index (from DUT) and second MCS index (from measurement result). When they differ, the device transmits a notification signal to request retransmission with adjusted modulation and coding parameters, enabling adaptive measurement while maintaining standard compatibility

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system changes the MCS parameter dynamically during the measurement process. By comparing MCS indices and requesting retransmission with different modulation schemes and coding rates, the measurement device can evaluate device characteristics under various parameter conditions while ensuring compatibility with IEEE 802.11ac standards

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If the measurement device accepts all modulation schemes and coding rates, then measurement coverage is improved, but measurement precision deteriorates due to inability to control retransmission

Engineering Contradiction:

Improvemeasurement coverageVSAvoidmeasurement accuracy

Core Design Contradiction:

Adaptability or versatilityVSMeasurement precision

Solution Approach 1:

The measurement device implements a feedback mechanism by transmitting notification signals to the device under measurement when the MCS index in the received frame differs from the MCS index in the measurement result. This feedback loop enables the measurement device to control retransmission and ensure precise measurements with arbitrary modulation schemes and coding rates

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS10433366B2Measurement device and measurement method

Publication Date: 2019.10.01 ANRITSU CORP

AI summary

A measurement device 10 includes a reception unit 13b that receives a frame transmitted from a DUT 1, an MCS determination unit 17a that determines whether or not a received MCS index of a frame received by the reception unit 13b matches a predetermined MCS index for comparison, a transmission unit 13a that transmits a notification signal to the DUT when the MCS determination unit 17a determines that the received MCS index matches the MCS index for comparison, and does not transmit the notification signal to the DUT when the MCS determination unit 17a determines that the received MCS index does not match the MCS index for comparison, and a measurement unit 14 that measures data under measurement included in the frame in which it is determined that the received MCS index matches the MCS index for comparison.