Common SIG Field for Legacy EHT Coexistence

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Solution Overview

Problem

Existing IEEE 802.11 wireless networks face challenges in integrating new generations with legacy systems, as new amendments require new signaling fields that legacy devices cannot decode, leading to inefficiencies in coexistence and power saving.

Innovation Solution

The implementation of a common preamble with a common SIG field that includes early signaling using the rate field to indicate packet type and channel configuration, allowing for improved coexistence and power saving across different IEEE 802.11 STAs by reducing detection and classification of PPDUs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If new IEEE 802.11 amendments are implemented with new signaling fields, then new features and higher throughput are achieved, but legacy devices cannot decode these new fields leading to coexistence inefficiencies

Engineering Contradiction:

Improvenetwork throughputVSAvoiddevice coexistence

Core Design Contradiction:

ProductivityVSAdaptability or versatility

Solution Approach 1:

The signaling fields are segmented into two parts: a common SIG field that legacy devices can decode and a new SIG field that provides enhanced functionality for newer devices. This segmentation allows simultaneous support for legacy and modern devices without requiring all devices to understand all signaling formats.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

A common SIG field acts as an intermediary between legacy devices and new signaling mechanisms. It provides a compatibility layer that allows legacy devices to coexist with newer devices while the new SIG field carries additional information for advanced devices that can decode it.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Adaptability or versatility

If new SIG fields are added for new amendments, then new packet types and configurations can be signaled, but packet detection and classification become more complex

Engineering Contradiction:

Improvepacket type signalingVSAvoidpacket detection complexity

Core Design Contradiction:

Adaptability or versatilityVSDifficulty of detecting and measuring

Solution Approach 1:

The common SIG field is placed before the new SIG field in the packet structure, performing preliminary signaling that legacy devices can process. This preliminary action provides essential packet information early in the transmission, allowing legacy devices to decode and process packets without needing to handle the more complex new SIG fields.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The signaling structure is extended into a new dimension by adding the new SIG field after the common SIG field. This dimensional extension allows additional packet type and configuration information to be conveyed without interfering with the original signaling structure that legacy devices rely upon.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Loss of information

If legacy devices must decode all signaling fields, then complete packet information is obtained, but power consumption increases and response time decreases

Engineering Contradiction:

Improvepacket information completenessVSAvoiddevice power consumption

Core Design Contradiction:

Loss of informationVSUse of energy by moving object

Solution Approach 1:

The essential packet information is extracted into the common SIG field, which legacy devices can decode efficiently. By taking out only the necessary information for legacy device operation into a separate, decodable field, devices can process critical information without the overhead of attempting to decode the entire extended signaling structure.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

Critical packet information is provided in advance in the common SIG field, allowing legacy devices to make quick decisions about packet processing without needing to decode the entire packet structure. This preliminary provision of information reduces both power consumption and response time by enabling early packet assessment.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS11569953B2Channel width, spatial streams, and short packet signaling

Publication Date: 2023.01.31 INTEL CORP

AI summary

Methods, apparatuses, and computer readable media include an apparatus of an access point (AP) or station (STA) comprising processing circuitry configured to decode a legacy preamble of a physical layer (PHY) protocol data unit (PPDU), determine whether the legacy preamble comprises an indication that the PPDU is an extremely-high throughput (EHT) PPDU, and in response to the determination indicating the PPDU is the EHT PPDU, decode the EHT PPDU. Some embodiments determine a spatial stream resource allocation based on a row of a spatial configuration table, a row of a frequency resource unit table, a number of stations, and location of the station relative to the number of stations in user fields of an EHT-signal (SIG) field. To accommodate 16 spatial streams, some embodiments extend the length of the packet extension field, extend signaling of a number of spatial streams, and/or extend a number of EHT-SIG symbols.