EHT Trigger Frame Spatial Reuse Signaling for HE/EHT WLANs

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Solution Overview

Problem

The 802.11be standard faces challenges in designing a trigger frame to schedule both HE and EHT stations efficiently, as existing methods cause low transmission efficiency due to overlapping basic service sets and half-duplex limitations.

Innovation Solution

A method for indicating a spatial reuse parameter in a trigger frame that allows scheduling both HE and EHT stations by setting one or two fields in the EHT TB PPDU's U-SIG based on values from the trigger frame, without altering the frame structure, and using a U-SIG reserved field for default values.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a trigger frame is used to schedule both HE and EHT stations, then compatibility with HE stations is maintained, but the frame structure becomes more complex and signaling overhead increases

Engineering Contradiction:

Improvecompatibility with HE and EHT stationsVSAvoidframe structure complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The trigger frame is designed to serve multiple functions: it can schedule both HE stations (802.11ax) and EHT stations (802.11be) using a unified frame structure. The common information field contains UL SRP fields that are interpreted differently by HE and EHT stations, allowing one frame to perform dual scheduling roles without requiring separate frame types

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent utilizes parameter interpretation differences between HE and EHT stations. The UL SRP fields in the trigger frame are interpreted as spatial reuse parameters by EHT stations while HE stations interpret them differently. This parameter-based differentiation allows the same frame structure to serve both station types without increasing complexity

Inventive Principle:

Principle #35Parameter changes

2Productivity

If spatial reuse parameters are indicated in the trigger frame, then transmission efficiency in overlapping BSS improves, but signaling overhead increases

Engineering Contradiction:

Improvetransmission efficiencyVSAvoidsignaling overhead

Core Design Contradiction:

ProductivityVSLoss of information

Solution Approach 1:

The spatial reuse parameter indication is merged into the existing UL SRP fields of the trigger frame's common information field. Instead of adding separate signaling elements, the patent combines the spatial reuse indication with the existing uplink spatial reuse parameter fields, thereby improving transmission efficiency without increasing overall signaling overhead

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The trigger frame's existing UL SRP fields serve dual purposes: they provide uplink spatial reuse parameters for HE stations and simultaneously indicate spatial reuse parameters for EHT stations. This self-service approach allows the same signaling elements to benefit both station types without requiring additional overhead

Inventive Principle:

Principle #25Self-service

3Reliability

If the frame structure of EHT TB PPDU is altered to include spatial reuse parameters, then EHT station performance improves, but compatibility with HE stations deteriorates

Engineering Contradiction:

ImproveEHT station performanceVSAvoidcompatibility with HE stations

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent segments the spatial reuse parameter indication into two parts: the trigger frame's common information field (which both HE and EHT stations process) and the EHT TB PPDU's U-SIG field (which only EHT stations process). This segmentation allows EHT-specific enhancements without affecting HE station operation, as HE stations ignore the U-SIG spatial reuse fields

Inventive Principle:

Principle #1Segmentation

4Measurement precision

If multiple UL SRP fields are copied to SRP fields in HE-SIG-A, then spatial reuse accuracy improves, but processing complexity increases

Engineering Contradiction:

Improvespatial reuse accuracyVSAvoidprocessing complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent copies the UL SRP field values from the trigger frame's common information field to the SRP fields in the HE-SIG-A of the EHT TB PPDU. This copying mechanism ensures that spatial reuse parameters are accurately transmitted from the trigger frame to the data packet, improving spatial reuse accuracy while using a simple copy operation rather than complex processing

Inventive Principle:

Principle #26Copying

Data Source

PatentUS20250254680A1Method for indicating spatial reuse parameter and determining spatial reuse parameter field and apparatus

Publication Date: 2025.08.07 HUAWEI TECH CO LTD

AI summary

This application relates to the wireless communication field, and is applied to a wireless local area network that supports the 802.11be standard. In particular, this application relates to a method including: An access point AP sends a trigger frame, where the trigger frame is used for triggering a station to send an extremely high throughput trigger based physical layer protocol data unit EHT TB PPDU. The station determines, based on one or two of a value indicated by an uplink EHT spatial reuse parameter UL EHT SRP and a value indicated by one or more uplink spatial reuse parameter UL SRP fields in a common information field of the trigger frame, a value indicated by a spatial reuse parameter SRP in a universal signal field U-SIG of the EHT TB PPDU. The STA sends the EHT TB PPDU to the AP.