Proactive BSS-Color Management for Wi-Fi 6 CCI

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Solution Overview

Problem

Current WiFi-6, WiFi-6E, and WiFi-7 systems face processing delays and battery consumption when detecting and resolving BSS-color collisions in overlapping radio ranges, leading to inefficient data transmission and increased overhead on wireless stations.

Innovation Solution

Implement a proactive method using scan reports from access points to identify neighboring BSSIDs and their associated BSS-colors, allowing for preemptive modification of BSS-colors to avoid potential collisions before they are reported by stations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If stations detect and report BSS-color collisions in real-time, then color collision resolution is achieved, but processing time and battery consumption increase significantly

Engineering Contradiction:

ImproveBSS-color collision resolutionVSAvoidprocessing time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The access point performs preliminary scanning of the wireless environment to identify neighboring BSSIDs and their BSS-color assignments before stations need to detect collisions. This advance preparation allows the AP to proactively assign unique BSS-colors to overlapping BSSs, eliminating the need for stations to perform time-consuming real-time detection and reporting of color collisions.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The access point acts as an intermediary that centralizes the BSS-color management function. Instead of individual stations detecting and reporting collisions, the AP scans the environment, identifies potential color conflicts, and assigns unique BSS-colors to overlapping BSSs. This intermediary approach consolidates the complex detection and resolution logic at the AP, reducing processing burden on stations.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Measurement precision

If stations continuously monitor and detect BSS-color collisions, then accurate collision detection is achieved, but battery consumption increases

Engineering Contradiction:

Improvecolor collision detection accuracyVSAvoidbattery consumption

Core Design Contradiction:

Measurement precisionVSUse of energy by moving object

Solution Approach 1:

The access point serves as an intermediary that performs the energy-intensive scanning and detection tasks on behalf of stations. The AP scans for neighboring BSSIDs, monitors BSS-color assignments, and identifies potential collisions, thereby eliminating the need for stations to continuously monitor and detect color collisions themselves. This transfers the energy burden from mobile stations to the powered access point.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The access point performs self-service by autonomously scanning the wireless environment, identifying overlapping BSSs, and assigning appropriate BSS-colors without requiring station involvement in the detection process. This self-service approach at the AP eliminates the need for stations to expend battery power on continuous monitoring and collision detection.

Inventive Principle:

Principle #25Self-service

3Reliability

If stations perform real-time BSS-color collision detection and reporting, then collision resolution is achieved, but data transmission efficiency decreases due to CSMA-CA back-off

Engineering Contradiction:

Improvecollision resolutionVSAvoiddata transmission efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The access point performs preliminary identification and BSS-color assignment for overlapping BSSs before stations attempt data transmission. By scanning the environment and assigning unique BSS-colors in advance, the system prevents color collisions from occurring during data transmission, eliminating the need for stations to invoke CSMA-CA back-off procedures and maintain high transmission efficiency.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The access point takes preliminary anti-action by proactively assigning unique BSS-colors to overlapping BSSs, thereby preventing color collisions before they can occur. This preventive measure eliminates the need for stations to detect and respond to collisions through CSMA-CA back-off, maintaining continuous data transmission efficiency.

Inventive Principle:

Principle #9Preliminary anti-action

4Reliability

If access points manage BSS-colors proactively using scan reports, then BSS-color collision occurrence is reduced, but AP processing overhead increases

Engineering Contradiction:

ImproveBSS-color collision preventionVSAvoidAP processing overhead

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The access point merges the BSS-color management function with its existing scan operations. By integrating BSS-color assignment logic into the regular scanning process, the AP leverages existing infrastructure and data collection mechanisms, thereby reducing the additional processing overhead that would result from implementing a separate, dedicated BSS-color management system.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS20250113288A1Smart BSS-coloring to overcome co-channel-interference (CCI) for wi-fi6

Publication Date: 2025.04.03 FORTINET INC

AI summary

Scan reports are received by a Wi-Fi controller from a plurality of access points. Each scan report identifies neighboring BSSIDs with associated BSS-color within radio range and corresponding RSSI measurements. An OBSS can be detected by cross referencing scan reports. BSS color us modified to avoid a potential BSS collision. A station associated the potential BSS collision reports actual color collisions. An indication of the BSS color change is transmitted to one or more access points for local implementation.