Wi-Fi Spatial Reuse Interference Margin Control

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Solution Overview

Problem

Wi-Fi networks face inefficiencies due to increased interference from multiple devices, as the IEEE 802.11 framework does not effectively control interference during spatial reuse, leading to potential transmission disruptions and suboptimal aggregate performance.

Innovation Solution

Implementing a method where each transmit/receive pair exchanges frames to estimate and manage interference, setting and announcing an interference margin to ensure compliance, allowing for controlled interference and improved performance through explicit or implicit feedback mechanisms.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If spatial reuse is implemented without interference control, then channel efficiency is improved, but interference increases causing transmission disruptions

Engineering Contradiction:

Improvechannel efficiencyVSAvoidinterference

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent implements feedback mechanisms where receiving devices send interference feedback to transmitting devices. This feedback loop enables dynamic adjustment of transmit power and spatial reuse decisions based on actual interference conditions, resolving the contradiction by allowing spatial reuse while maintaining interference through control

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent dynamically changes transmission parameters such as power levels and spatial reuse thresholds based on channel conditions and interference measurements. By adjusting these parameters adaptively, the system can maximize channel efficiency while keeping interference below disruptive levels

Inventive Principle:

Principle #35Parameter changes

2Productivity

If interference margin is increased to allow more spatial reuse, then aggregate throughput increases, but signal-to-interference ratio deteriorates

Engineering Contradiction:

Improveaggregate throughputVSAvoidsignal-to-interference ratio

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent makes the interference margin dynamic rather than fixed. The interference margin is adjusted in real-time based on channel conditions, traffic load, and quality of service requirements. This dynamic adjustment allows the system to increase aggregate throughput when conditions permit while maintaining adequate signal-to-interference ratios when needed

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent performs preliminary interference assessment and margin calculation before transmissions occur. By pre-evaluating potential interference and setting appropriate margins in advance, the system can safely increase spatial reuse opportunities without compromising signal-to-interference ratio during actual transmissions

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentEP3162112B1Spatial reuse of wi-fi channels with interference estimation and control

Publication Date: 2020.12.23 INTEL CORP

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AI summary

A transmitter/receiver pair may estimate a first channel interference caused during the spatial reuse phase by the transmitter/receiver pair to other transmitter/receiver pairs over a channel. A second channel interference experienced by the transmitter/receiver pair may be estimated during the spatial reuse phase by the transmitter/receiver pair from the other transmitter/receiver pairs. An interference margin may be estimated for the channel based on the first and second channel interferences. The interference margin may be announced to the other transmitter/receiver pairs in frame. The interference margin may then be complied with while communicating over the channel in order to control the interference.