IEEE 802.11-24/1875r0 November 2024 Submission on FT and SR Architecture
"Explore the architecture for Seamless Roaming (SR) and Fast Transition (FT) in IEEE 802.11-24/1875r0 document, focusing on minimizing changes to key hierarchy while enabling smooth transitions and roaming between AP MLDs."
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November 2024 doc.: IEEE 802.11-24/1875r0 802.11bn Architecture and Key Hierarchy Date: 2024-11-08 Authors: Name Jarkko Kneckt Affiliations Apple Inc. Address Cupertino, CA Phone email jkneckt@apple.com Pooya Monajemi Yong Liu Yanjun Sun Chitto Ghosh Submission Slide 1 Jarkko Kneckt, Apple
November 2024 doc.: IEEE 802.11-24/1875r0 Abstract This submission defines architecture when an AP MLD supports Seamless Roaming (SR) and 802.11r fast transition (FT). The proposed architecture minimizes changes to the 802.11r key hierarchy. Submission Slide 2 Jarkko Kneckt, Apple
November 2024 doc.: IEEE 802.11-24/1875r0 The Main Roaming Concepts FT: FT is possible within a Mobility Domain (MD) FT requires a STA to re-associate SR: SR is possible within an UHR Seamless Roaming Domain (USRD) When an UHR STA roams, it stays associated (state 4) with USRD USRD may be within a MD PR: A STA may rekey its PTK at any time Note: AP MLDs in USRD do not support FT, if the USRD is not within a MD Jarkko Kneckt, Apple Submission Slide 3
November 2024 doc.: IEEE 802.11-24/1875r0 Proposal, FT Support for Legacy STAs All APs and AP MLDs in a Mobility Domain have FT parameters to support legacy STAs Legacy STAs do not see any differences on FT use Within a mobility domain an UHR non-AP STA: Should do SR between AP MLDs of the same USRD Should do FT otherwise 802.11bn key hierarchy needs to support both SR and FT protocols Jarkko Kneckt, Apple Submission Slide 4
November 2024 doc.: IEEE 802.11-24/1875r0 Proposal: FT Compliant Key Hierarchy Background: FT has 2 level PMK hierarchy PMK-R0 is stored at the mobility domain PMK-R1 is created at the association level FT and SR use PMK-R1 to create PTK USRD has common PMK-R1 for affiliated AP MLDs Changes to the key hierarchy are minimized A non-AP device selects its association level (Link, MLD, or USRD) Jarkko Kneckt, Apple Submission Slide 5
November 2024 doc.: IEEE 802.11-24/1875r0 Summary Seamless roaming (SR) is possible between AP MLDs in UHR Seamless Roaming Domain Fast Transition (FT) is possible between APs and AP MLDs in Mobility Domain The PMK-R0 is maintained in Mobility Domain The PMK-R1 is created at association level (Link, MLD, or USRD) FT and SR use PMK-R1 to create PTK Submission Slide 6 Jarkko Kneckt, Apple
November 2024 doc.: IEEE 802.11-24/1875r0 Straw Poll Do you support to use PMK-R0 and PMK-R1 as shared PMK in an UHR SR domain, if the UHR SR domain is part of a (FT) mobility domain? - The PMK-R0 and PMK-R1 are compatible with FT key hierarchy Submission Slide 7 Jarkko Kneckt, Apple
November 2024 doc.: IEEE 802.11-24/1875r0 Annex: Different Views of Wi-Fi Architecture 802.11ax and older STAs view 802.11bn STAs view 802.11be STAs view Jarkko Kneckt, Apple Submission Slide 8
