Critical Update Flag for Non-Collocated AP MLDs
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Solution Overview
Problem
In wireless local area networks (WLANs), non-collocated access point (AP) multilink devices (MLDs) face challenges in efficiently managing critical updates across multiple frequency bands, leading to potential missed important fields or elements by stations (STAs) that only listen to one frequency band at a time, and existing solutions are impractical for large numbers of affiliated APs.
Innovation Solution
The implementation of a critical update procedure for non-collocated AP MLDs, where affiliated APs transmit advertisements with a Reduced Neighbor Report element in management frames, including a Critical Update flag and BSS Parameters Change Count, allowing STAs to track updates across different frequency bands and collocated sets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If non-collocated APs transmit critical updates on all frequency bands, then STAs can receive complete update information, but STAs listening to only one frequency band at a time may miss important fields or elements
Solution Approach 1:
The patent segments the critical update information transmission by designating specific APs as lead APs for different collocated sets. Each lead AP is responsible for transmitting critical updates on its associated frequency band, dividing the overall update transmission task across multiple APs and frequency bands to ensure comprehensive coverage.
Solution Approach 2:
The patent establishes lead AP designations and collocated set associations in advance before critical updates occur. This preliminary organization allows STAs to know which frequency band to monitor for critical updates from their associated lead AP, enabling them to receive updates reliably without needing to monitor all frequency bands simultaneously.
2Ease of manufacture
If existing critical update procedures are used for non-collocated APs, then implementation is straightforward, but the solution becomes impractical for large numbers of affiliated APs
Solution Approach 1:
The patent divides the large network into multiple collocated sets, each with a designated lead AP. This segmentation transforms the complex problem of managing critical updates across many non-collocated APs into simpler, manageable units where each lead AP handles updates for its specific collocated set, making the overall system scalable.
Solution Approach 2:
The patent introduces the dimension of collocated set organization and lead AP designation to manage non-collocated APs. By organizing APs into collocated sets with designated leads, the system adds a hierarchical layer that simplifies the management of critical updates across numerous APs without requiring direct peer-to-peer coordination between all APs.
3Reliability
If STAs monitor multiple frequency bands simultaneously to catch all critical updates, then no updates are missed, but power consumption and device requirements increase
Solution Approach 1:
The patent performs preliminary association between STAs and lead APs, and between lead APs and collocated sets, before critical updates occur. This pre-established mapping allows STAs to determine in advance which single frequency band to monitor for critical updates, eliminating the need to simultaneously monitor multiple bands while ensuring reliable update reception.
Solution Approach 2:
The lead AP acts as an intermediary that consolidates critical update information from its collocated set and transmits it on its associated frequency band. STAs communicate with the lead AP rather than directly with all APs in the collocated set, reducing the number of frequency bands each STA must monitor while ensuring comprehensive update coverage.
Data Source
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AI summary
Methods, apparatuses, and computer readable media for critical updates for access points (APs), the apparatus of a first AP of a non-collocated AP MLD, the apparatus comprising processing circuitry configured to: set a value of a non-collocated AP MLD critical update flag subfield to indicate 1, if there is a change to a value in a basic service set (BSS) parameter change count subfield of a MLD parameters field in a reduced neighbor report element for a second AP, the second AP affiliated with the non-collocated AP MLD, where the first AP and the second AP have a setup link for a non-AP MLD associated with the non-collocated AP MLD, and where the first AP and the second AP are part of a different collocated sets, and the processing circuitry further configured to encode for transmission a capability information field, the capability information field comprising the critical update flag subfield.