Multi-Link BSS Parameter Update via Intermediary Beacon

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Solution Overview

Problem

In wireless communication systems, non-AP multi-link devices (MLD) often fail to receive Basic Service Set (BSS) parameter updates on links they are not actively monitoring, leading to inefficiencies and potential loss of connectivity.

Innovation Solution

The method involves broadcasting BSS parameter updates over a different wireless link, using Extended Channel Switch Announcement (ECSA) information elements, allowing non-AP MLDs to update their parameters even when not actively listening, enabling seamless channel switching and maintaining connectivity across multiple links.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If a non-AP MLD operates on multiple links concurrently to increase bandwidth, then network throughput is improved, but power consumption increases and the device cannot actively listen on all links simultaneously

Engineering Contradiction:

Improvenetwork throughputVSAvoidpower consumption

Core Design Contradiction:

ProductivityVSUse of energy by moving object

Solution Approach 1:

The patent segments the monitoring function by designating one link as a primary monitoring link where the non-AP MLD actively listens for BSS parameter updates, while other links can operate in sleep or reduced-power modes. This segmentation allows the device to maintain connectivity and receive updates on multiple links without continuously monitoring all of them, thus improving throughput while managing power consumption.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces an intermediary mechanism where BSS parameter updates intended for one link are forwarded or announced through another link that the non-AP MLD is actively monitoring. This intermediary approach allows the device to receive parameter updates for links it is not currently monitoring, enabling efficient channel management across multiple links without requiring simultaneous active listening on all links.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Use of energy by moving object

If a non-AP MLD actively monitors only one link to conserve power, then power consumption is reduced, but the device may miss BSS parameter updates on other links

Engineering Contradiction:

Improvepower consumptionVSAvoidparameter update reception

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The patent employs an intermediary mechanism where BSS parameter updates for a secondary link are announced through the primary monitoring link. When the non-AP MLD is actively monitoring the primary link, it receives these forwarded updates and can apply them to the secondary link even though it is not actively listening on that link. This resolves the contradiction by ensuring reliable parameter update reception while maintaining low power consumption through selective monitoring.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent implements preliminary action by having the AP MLD prepare and announce BSS parameter updates for multiple links in advance through the primary monitoring link, before the non-AP MLD needs to switch to or activate secondary links. This allows the non-AP MLD to receive and process parameter updates proactively while remaining in a low-power state on secondary links, ensuring reliability without increasing power consumption.

Inventive Principle:

Principle #10Preliminary action

3Adaptability or versatility

If a non-AP MLD switches channels on a link to optimize performance, then network flexibility is improved, but the device may miss updates on the original link

Engineering Contradiction:

Improvechannel switching capabilityVSAvoidparameter update loss

Core Design Contradiction:

Adaptability or versatilityVSLoss of information

Solution Approach 1:

The patent uses an intermediary mechanism where BSS parameter updates for links that the non-AP MLD has switched away from are announced through the current active monitoring link. This allows the device to receive parameter updates for switched-away links without needing to return to or actively monitor those links, preventing information loss while maintaining channel switching flexibility.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent implements multi-functionality by enabling a single monitoring link to serve multiple purposes: it not only carries traffic for that link but also announces BSS parameter updates for other links where the non-AP MLD may have switched channels. This universal approach allows the device to maintain adaptability across multiple links while concentrating monitoring resources on one link, preventing parameter update loss during channel switching.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS11595884B2Apparatus and methods for EHT multi-link BBS parameter update

Publication Date: 2023.02.28 MEDIATEK SINGAPORE PTE LTD

AI summary

Embodiments of the present invention provide apparatus and methods for announcing a BSS parameter updates for a wireless link that can be received by a MLD even when the MLD is not listening for parameter updates on that specific link by employing a different wireless link to broadcast, receive, and/or signal the BSS parameter update. An MLD can update the BSS parameters of the wireless link and use the wireless link according to the updated BSS parameters (e.g., after performing a channel switch). According to some embodiments, an STA within an AP MLD transmits an information elements (IE) including BSS parameter updates associated with a different STA (operating on a different wireless link) within the AP MLD.