EHT-SIG Subfield for NOMA Usage Recognition in Wireless LAN

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Solution Overview

Problem

Current communication devices lack a mechanism to recognize whether Non-Orthogonal Multiple Access (NOMA) is used in a radio frame, which hinders effective data transmission and reception in wireless LANs.

Innovation Solution

Incorporating a subfield in the EHT-SIG of the radio frame's preamble to indicate the use of NOMA, allowing communication devices to determine if NOMA is employed during data transmission, thereby enabling appropriate processing and data separation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of information

If a subfield for NOMA indication is added to the EHT-SIG, then communication devices can recognize NOMA usage, but the frame structure complexity increases

Engineering Contradiction:

ImproveNOMA usage recognitionVSAvoidframe structure

Core Design Contradiction:

Loss of informationVSDevice complexity

Solution Approach 1:

The EHT-SIG field is segmented into multiple subfields, with a specific subfield allocated for NOMA indication. This segmentation allows the NOMA usage information to be clearly indicated within the existing frame structure without requiring a complete restructuring, thus resolving the contradiction between information recognition and frame complexity.

Inventive Principle:

Principle #1Segmentation

2Productivity

If NOMA is implemented in wireless LAN, then throughput is improved, but compatibility with conventional standards becomes more difficult

Engineering Contradiction:

ImprovethroughputVSAvoidcompatibility

Core Design Contradiction:

ProductivityVSAdaptability or versatility

Solution Approach 1:

The system dynamically adapts between NOMA and conventional transmission modes based on the NOMA indication subfield. When NOMA is indicated, the communication device processes the frame using NOMA-specific methods; otherwise, it uses conventional processing. This dynamic adaptability allows throughput improvement through NOMA while maintaining compatibility with conventional standards.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The NOMA indication subfield acts as an intermediary that bridges NOMA and conventional standards. It provides a clear signal to communication devices about whether NOMA is used, enabling seamless transition between modes and ensuring that devices can appropriately handle frames regardless of whether they use NOMA or conventional transmission methods.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS11612014B2Communication device, communication method thereof, information processing device, control method thereof, and storage medium

Publication Date: 2023.03.21 CANON KK

AI summary

A communication device that transmits or receives a radio frame including a preamble and a data field of a physical layer (PHY) is provided. 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 (Extremely High Throughput Signal Field), an EHT-STF (EHT Short Training Field), and an EHT-LTF (EHT Long Training Field), and the EHT-SIG includes a subfield in which information on whether NOMA (Non-Orthogonal Multiple Access) is used in transmission of data included in the data field is set.