Trigger Frame AID12 Subfield Redundancy in 802.11ax Random Access

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Solution Overview

Problem

The AID12 subfield becomes redundant when the RA variant Trigger frame is applied in IEEE 802.11ax communication, leading to inefficiencies in field utilization.

Innovation Solution

A communication apparatus and method that generates and utilizes different information in the AID12 subfield based on trigger-type information for random-access transmission, allowing effective reduction of redundant fields by determining resource units for random access and generating corresponding signals.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of information

If the AID12 subfield is used to indicate RA resource units in the RA variant Trigger frame, then the terminal can determine resource units for random access, but the AID12 subfield becomes redundant and cannot effectively convey terminal-specific information

Engineering Contradiction:

Improveinformation conveyance efficiencyVSAvoidfield utilization complexity

Core Design Contradiction:

Loss of informationVSDevice complexity

Solution Approach 1:

The AID12 subfield is designed to serve multiple functions: it can indicate terminal identity in conventional Trigger frames, and indicate resource unit allocation for random access in RA variant Trigger frames. This multi-functionality resolves the redundancy issue by making the field versatile across different trigger frame types.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The interpretation of the AID12 subfield changes based on the trigger frame type. When the trigger frame is an RA variant type, the AID12 value is interpreted as indicating resource unit allocation rather than terminal identity, effectively changing the parameter meaning based on context.

Inventive Principle:

Principle #35Parameter changes

2Productivity

If the Trigger frame size is reduced by removing or optimizing fields, then transmission efficiency improves, but the ability to convey necessary control information may be compromised

Engineering Contradiction:

Improvetransmission efficiencyVSAvoidcontrol information completeness

Core Design Contradiction:

ProductivityVSLoss of information

Solution Approach 1:

The AID12 subfield serves dual purposes: terminal identification in conventional scenarios and resource unit indication in random access scenarios. This eliminates the need for separate dedicated fields, reducing overall frame size while maintaining complete control information functionality.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The functionality of indicating resource units for random access is merged into the existing AID12 subfield structure rather than adding a separate field. This consolidation reduces the total number of fields in the Trigger frame while preserving all necessary control information.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS20240349359A1Communication apparatus, terminal, and communication method

Publication Date: 2024.10.17 PANASONIC INTELLECTUAL PROPERTY CORP OF AMERICA

AI summary

A communication apparatus in the present disclosure comprises an AID generator, a Trigger frame generator, and a wireless transmitter/receiver. When a Trigger Type in a trigger frame is an RA trigger, the AID generator generates, as information for an AID12 subfield, information that is different from an AID. The Trigger frame generator generates a RA variant Trigger frame when the Trigger Type in the trigger frame is an RA trigger, and sets, in the AID12 subfield included in the RA variant Trigger frame, the information output from the AID generator. The wireless transmitter/receiver transmits the Trigger frame, generated by the Trigger frame generator, to a terminal.