MLD Beacon Update Indication to Prevent Wi‑Fi Probe Storms

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

In IEEE 802.11be Multi-Link Device (MLD) operation, the notification of Basic Service Set (BSS) parameter updates to clients leads to unwanted beacon bloat and probe storm issues, as clients send multiple probe requests to obtain updated parameters.

Innovation Solution

An AP of an MLD device includes out-of-link BSS parameter updates in a beacon frame with a flag indicating that all updates will be communicated, preventing clients from sending unnecessary probe requests.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of information

If BSS parameter updates are included in transmitted beacon frames, then clients can receive updated parameters, but beacon frame size increases causing beacon bloat

Engineering Contradiction:

ImproveBSS parameter update deliveryVSAvoidbeacon frame size

Core Design Contradiction:

Loss of informationVSVolume of moving object

Solution Approach 1:

The patent extracts only the essential update notification (Change Sequence Number) from the full BSS parameter updates, placing it in the beacon frame. The complete updated parameters are then provided on-demand through probe response frames, separating the notification function from the data transmission function to avoid beacon bloat.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent performs preliminary notification by including the Change Sequence Number in beacon frames before clients request full parameter updates. This preliminary action allows clients to identify parameter changes without receiving the complete parameter data in the beacon, enabling efficient update detection without beacon bloat.

Inventive Principle:

Principle #10Preliminary action

2Loss of information

If clients send probe requests to obtain updated parameters, then clients can receive complete BSS parameters, but network experiences probe storm disruptions

Engineering Contradiction:

ImproveBSS parameter acquisitionVSAvoidprobe storm

Core Design Contradiction:

Loss of informationVSObject-generated harmful factors

Solution Approach 1:

The patent implements a feedback mechanism where the Access Point includes a Change Sequence Number in beacon frames to notify clients of parameter updates. Clients use this feedback to determine whether to send probe requests, creating a controlled feedback loop that reduces unnecessary probe requests while ensuring parameter updates are received.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The Access Point performs preliminary notification by embedding the Change Sequence Number in beacon frames before clients need to request full parameter updates. This preliminary action informs clients of parameter changes in advance, allowing them to send targeted probe requests only when necessary, thereby preventing probe storms.

Inventive Principle:

Principle #10Preliminary action

3Productivity

If all BSS parameter updates are included in beacon frames, then clients receive complete updates without probe requests, but beacon transmission overhead increases

Engineering Contradiction:

Improveparameter update efficiencyVSAvoidbeacon transmission overhead

Core Design Contradiction:

ProductivityVSLoss of energy

Solution Approach 1:

The patent extracts only the Change Sequence Number from the complete BSS parameter updates and places it in beacon frames. The full parameter updates are transmitted separately on-demand through probe response frames. This extraction approach maintains parameter update efficiency while significantly reducing beacon transmission overhead and energy consumption.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent applies partial action by including only the essential Change Sequence Number in beacon frames rather than complete BSS parameter updates. This partial inclusion is sufficient for clients to detect parameter changes and request updates only when necessary, optimizing the balance between update efficiency and transmission overhead.

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS12484103B2Complete basic service set (BSS) update report indication for multi-link device (MLD) access points

Publication Date: 2025.11.25 CISCO TECHNOLOGY INC

AI summary

A method is provided in which an AP of a MLD AP device may decide to include all out-of-link BSS parameters updates in a beacon frame (beacon). A flag is included in the beacon frame to indicate that all updates are included in the beacon frame and thus the client device that receives the beacon frame should not send probe request frames (probe requests) to obtain these updates. Thus, a non-AP MLD that receives a beacon frame with the above indication and that has all critical BSS parameters corresponding to the Change Sequence Number (CSN) that preceded the updates indicated by the AP, should not send probe requests to obtain the updated parameters. The number of bits to assign to the complete BSS Update Report Indication flag may vary depending on the number of updates to be reported.