EHT-SIG-A Field Modulation Scheme Signaling

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Solution Overview

Problem

Conventional IEEE802.11 wireless LAN standards lack a mechanism to determine whether to use a Uniform Constellation (UC) or Non-Uniform Constellation (NUC) modulation scheme for data transmission, limiting throughput improvement efforts in high-demand scenarios.

Innovation Solution

A communication device that includes a PHY frame structure with fields indicating the modulation scheme, specifically using the EHT-SIG-A field to signal whether a UC or NUC scheme is employed, allowing for dynamic selection based on reception environment and user input.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If NUC modulation scheme is used to improve throughput, then data transmission efficiency is improved, but a mechanism to notify which modulation scheme is used is required, increasing system complexity

Engineering Contradiction:

Improvedata transmission efficiencyVSAvoidmodulation scheme notification mechanism

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent combines the modulation scheme indication with the existing EHT-SIG-A signal field structure. The UC/NUC information is integrated into the signal field that already carries other control information, merging multiple functions into a unified structure rather than adding a separate notification mechanism.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The EHT-SIG-A field is designed to serve multiple purposes: it carries both the UC/NUC modulation scheme indication and other control information. This multi-functional approach allows a single field to handle multiple tasks, reducing overall system complexity while enabling NUC scheme notification.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Reliability

If UC scheme is used for modulation, then compatibility with conventional standards is maintained, but throughput improvement under congestion is limited

Engineering Contradiction:

Improvecompatibility with conventional standardsVSAvoidcommunication speed under congestion

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent enables dynamic selection between UC and NUC modulation schemes based on channel conditions and congestion levels. The system can adaptively switch between schemes, using UC for compatibility and NUC for improved throughput when conditions permit, making the modulation approach flexible rather than fixed.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the modulation scheme parameter from a fixed conventional approach to a variable selection between UC and NUC. By allowing the modulation parameter to change based on channel conditions, the system achieves both compatibility (when using UC) and improved throughput (when using NUC).

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS12155521B2Communication device, communication method, and computer-readable storage medium

Publication Date: 2024.11.26 CANON KK

AI summary

A communication device communicates a physical (PHY) frame including a preamble and a data field. The preamble includes a Legacy Short Training Field (L-STF), a Legacy Long Training Field (L-LTF), a Legacy Signal Field (L-SIG), an EHT Signal Field (EHT-SIG-A), an EHT Short Training Field (EHT-STF), and an EHT Long Training Field (EHT-LTF), and the EHT-SIG-A includes fields indicating a modulation scheme and information indicating which one of a UC (Uniform Constellation) scheme and an NUC (Non Uniform Constellation) scheme is used as the modulation scheme, and the data field includes data that has undergone modulation corresponding to the modulation scheme and the information indicated by the fields.