Individually Addressed Traffic Indication via Working-Link Beacons

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Solution Overview

Problem

Some special access point multi-link devices (AP MLDs) cannot send beacon frames to indicate whether station multi-link devices (STA MLDs) have downlink individually addressed traffics, leading to incorrect reception of such traffic by STAs.

Innovation Solution

AP MLDs generate and send individually addressed traffic indication information through management frames like beacon or probe response frames, allocating unique AIDs to non-AP MLDs to ensure correct traffic indication across multiple links.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If AP MLDs use non-transmitted BSSIDs to increase network capacity and reduce interference, then more APs can operate simultaneously, but beacon frames cannot be sent to indicate downlink individually addressed traffics

Engineering Contradiction:

Improvenetwork capacityVSAvoidtraffic indication reliability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent introduces a working link as an intermediary channel. The working link AP MLD sends beacon frames containing traffic indication information to the STA MLD, enabling reliable communication even when the non-transmitted BSSID AP MLD cannot directly send beacons. This intermediary mechanism resolves the contradiction by separating the data transmission function (on non-transmitted BSSID) from the control signal function (on working link).

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent segments the AP MLD into two functional parts: a working link AP MLD that handles beacon frame transmission and traffic indication, and a non-transmitted BSSID AP MLD that handles data transmission. This segmentation allows each part to perform its specific function independently, resolving the contradiction between network capacity and traffic indication reliability.

Inventive Principle:

Principle #1Segmentation

2Productivity

If multiple links are used to increase throughput, then peak throughput increases, but complexity of managing individually addressed traffic indication across links increases

Engineering Contradiction:

Improvepeak throughputVSAvoidtraffic indication management complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The working link AP MLD performs multiple functions: it transmits beacon frames, carries traffic indication information for both itself and associated non-transmitted BSSID AP MLDs, and manages multiple links simultaneously. This multi-functionality reduces overall system complexity by consolidating management tasks into a single universal component.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent merges the traffic indication information of multiple AP MLDs into a single beacon frame transmitted by the working link AP MLD. Instead of requiring separate indication mechanisms for each link, the working link consolidates and transmits all necessary traffic indication information in one unified beacon frame, reducing management complexity.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS20250338183A1Individually addressed traffic indication method applicable to multiple links and related apparatus

Publication Date: 2025.10.30 HUAWEI TECH CO LTD

AI summary

This application relates to the field of wireless communication, and in particular, to individually addressed traffic indication methods and apparatuses applicable to multiple links, for example, in a wireless local area network supporting an 802.11be standard. In an example method, a first access point (AP) of a first access point multi-link device (AP MLD) generates and sends individually addressed traffic indication information. The individually addressed traffic indication information is used to indicate whether a non-AP MLD associated with a second AP MLD has a downlink individually addressed traffic. The second AP MLD is an AP MLD to which a non-transmitted AP belongs. The non-transmitted AP is in a multiple basic service set identifier (BSSID) set in which the first AP is located.