Communication Device EHT-SIG-A Signaling for Concurrent Multi-AP Recognition

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Solution Overview

Problem

Existing wireless LAN standards, such as IEEE802.11ax, do not provide a mechanism for a station (STA) to recognize when frames are concurrently transmitted from multiple access points (APs), limiting throughput improvement in congested conditions.

Innovation Solution

A communication device transmits a radio frame with a preamble that includes specific fields indicating whether data is concurrently transmitted from multiple APs to a common partner device, utilizing an EHT-SIG-A subfield to signal this concurrency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If conventional IEEE802.11ax standard is used, then communication speed is maintained at existing levels, but throughput cannot be improved in congested conditions

Engineering Contradiction:

ImprovethroughputVSAvoidability to recognize concurrent transmission

Core Design Contradiction:

ProductivityVSAdaptability or versatility

Solution Approach 1:

The patent modifies the EHT-SIG-A field parameters by adding a concurrency indication subfield that changes the signaling parameters to indicate whether multiple APs are transmitting concurrently. This parameter change enables STAs to recognize concurrent transmissions and adjust their reception accordingly, resolving the contradiction between maintaining conventional compatibility and achieving improved throughput.

Inventive Principle:

Principle #35Parameter changes

2Ease of operation

If STA communicates with single AP, then communication mechanism is simple, but cannot recognize concurrent data transmission from multiple APs

Engineering Contradiction:

Improvecommunication mechanism simplicityVSAvoidconcurrent transmission recognition

Core Design Contradiction:

Ease of operationVSLoss of information

Solution Approach 1:

The patent introduces an intermediary field (concurrency indication subfield in EHT-SIG-A) that mediates between the transmission APs and the receiving STA. This intermediary signaling mechanism conveys concurrency information without requiring fundamental changes to the basic single-AP communication model, thus maintaining simplicity while preventing information loss about concurrent transmissions.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Productivity

If multiple APs transmit concurrently to improve throughput, then data transmission speed increases, but STA cannot recognize which AP transmitted which frame

Engineering Contradiction:

ImprovethroughputVSAvoidtransmission source identification

Core Design Contradiction:

ProductivityVSMeasurement precision

Solution Approach 1:

The patent segments the EHT-SIG-A field into multiple subfields including a concurrency indication subfield and other transmission parameters. This segmentation allows the system to separately indicate whether concurrent transmission occurs while maintaining identification of individual AP transmissions through other fields, thus achieving both improved throughput and precise transmission source measurement.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS20250267511A1Communication device, communication method thereof, information processing device, control method thereof, and computer-readable storage medium

Publication Date: 2025.08.21 CANON KK

AI summary

A communication device communicates a radio frame including a preamble and a data field of a physical layer (PHY). The preamble includes an L-STF (Legacy Short Training Field), an L-LTF (Legacy Long Training Field), an L-SIG (Legacy Signal Field), an EHT-SIG-A (Extremely High Throughput Signal A Field), an EHT-STF (EHT Short Training Field), and an EHT-LTF (EHT Long Training Field), and the EHT-SIG-A includes a subfield indicating whether data are concurrently transmitted from a plurality of communication devices to a common partner device.