IEEE 802.11-19/1583r0 Multi-Link BSS Operations Overview
Explore the major MLME functions for the Multi-Link model in the IEEE 802.11-19/1583r0 document, covering pre-association operations, authentication, association, and post-association power management. The submission delves into the overall architecture, phases in Multi-Link setup, and Multi-Link capabilities and operations signaling during association. Learn how Multi-Link APs and STAs interact, authenticate, and securely join a Multi-Link BSS across different channels. Discover the dynamic signaling and management of operating links post-association for enhanced multi-link communication.
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Presentation Transcript
September 2019 doc.: IEEE 802.11-19/1583r0 Multi-Link BSS Operations Date: 2019-09-06 Authors: Name Jarkko Kneckt Affiliations Address Apple Inc Phone email jkneckt@apple.com Cupertino CA Yong Liu Apple Inc Jinjing Jiang Apple Inc Tianwu Yu Apple Inc Guoqing Li Apple Inc SK Yong Apple Inc Submission Slide 1 Jarkko Kneckt (Apple)
September 2019 doc.: IEEE 802.11-19/1583r0 Abstract This submission discusses some of the major MLME functions for the Multi-Link model: Pre-association operations Authentication and Association Post-association power management Submission Slide 2 Jarkko Kneckt (Apple)
September 2019 doc.: IEEE 802.11-19/1583r0 An Example of Overall Architecture Submission Slide 3 Jarkko Kneckt (Apple)
September 2019 doc.: IEEE 802.11-19/1583r0 Phases in Multi-Link Setup Multi-Link AP Multi-Link STA Authentication exchange AP discovery Discover EHT APs and their links Pre-association Pre-association Authentication exchange Authenticate and create master keys Association exchange Associate to an EHT AP and signal/negotiate capabilities Post association Post association 4-way handshake Setup the pairwise and group transient key Data channels Data channel in 5G Data exchange Link1 2.4G Link2 5G Link1 2.4G Link2 5G Link3 6G Link3 6G Submission Slide 4 Jarkko Kneckt (Apple)
September 2019 doc.: IEEE 802.11-19/1583r0 Multi-Link Setup (1/2) A Multi-Link AP is discoverable on all channels in which it operates, i.e. beacons and probe responses are transmitted on all links EHT STAs may discover the Multi-Link AP with multiple links in different channels Legacy STAs may discover multiple BSSs with the same SSID in different channels A single authentication, association and 4-way handshake enable a Multi-Link STA to securely join a Multi-Link BSS Authentication and Association may be done in any link Submission Slide 5 Jarkko Kneckt (Apple)
September 2019 doc.: IEEE 802.11-19/1583r0 Multi-Link Setup (2/2) The multi-link capabilities and operations are signaled / negotiated / confirmed during the association e.g. A Multi-Link STA can select its own operating link(s), based on a Multi-Link AP s capabilities and operating links, and indicate its selection in the Associate Request frame After association, a Multi-Link STA may use the Power Management and/or A-Control fields in MAC header to dynamically signal / change the availabilities of its operating links Examples are shown at the end of the submission Submission Slide 6 Jarkko Kneckt (Apple)
September 2019 doc.: IEEE 802.11-19/1583r0 Example: Submission Slide 7 Jarkko Kneckt (Apple)
September 2019 doc.: IEEE 802.11-19/1583r0 Power Management / Link Availability Examples Wi-Fi / BT Coex Stop Wi-Fi Busy Lower Tx /Rx MAC 2 Lower Tx /Rx MAC 1 awake 2.4GHz (busy) Lower Tx/Rx MAC 1 Lower Tx/Rx MAC 2 5GHz awake Link 1 Link 2 awake awake Link 1 Link 2 Link 2 Link 1 doze doze doze doze PS-Poll / Trigger Link 1 => OFF PM =1 Indicate doze for the whole Multi-Link STA Indicate awake for the whole Multi-Link STA Indicate unavailability of a different link Submission Slide 8 Jarkko Kneckt (Apple)
September 2019 doc.: IEEE 802.11-19/1583r0 Power Management / Link Availability Approaches Submission Slide 9 Jarkko Kneckt (Apple)
September 2019 doc.: IEEE 802.11-19/1583r0 Summary This submission discussed on major MLME functions of the Multi-Link BSS The main principles of Multi-Link power save and link availability mechanisms are described Submission Slide 10 Jarkko Kneckt (Apple)
September 2019 doc.: IEEE 802.11-19/1583r0 Straw poll 1 Do you agree that a Multi-Link STA may signal on one link the availability of all links and/or other link(s)? Yes: No: Abstain: Submission Slide 11 Jarkko Kneckt (Apple)
