Understanding IEEE 802.11 Multi-BSSID Operation with MLO
Explore the concept of Multiple BSSID Set and MLD in IEEE 802.11, allowing multiple virtual APs on the same device with shared or unique attributes. Discover how these features work together and the implications for network architecture.
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March 2020 doc.: IEEE 802.11-19/0358r2 Multi-BSSID Operation with MLO Date: 2020-03-15 Name Affiliation Address Phone Email Abhishek Patil Qualcomm Inc. appatil@qti.qualcomm.com Duncan Ho Qualcomm Inc. George Cherian Qualcomm Inc. Alfred Asterjadhi Qualcomm Inc. Submission Abhishek P (Qualcomm), et. al., Slide 1
March 2020 doc.: IEEE 802.11-19/0358r2 Overview Multiple BSSID set feature enables multiple (virtual) APs hosted on the same device to setup BSS on a link Each (virtual) AP has its own capabilities and other attributes E.g., SSID, security, feature set etc In multi-link operation, APs of an MLD share common parameters E.g., common security, BA session and possibly SSID This document takes a closer look on how these two features fit together Submission Slide 2 Abhishek P (Qualcomm), et. al.,
March 2020 doc.: IEEE 802.11-19/0358r2 Multiple BSSID set with MLO Since each (virtual) AP on a link has different set of attributes, they can t be part of the same AP MLD. Further, it is possible to have (virtual) APs on different links be part of the same AP MLD E.g., an enterprise network utilizes all links and has same SSID, common security and BA session across all links. A guest network uses a subset of the links which share security and BA session. Therefore, a set of virtual APs from different links would belong to the same AP MLD There would be different AP MLDs operating on the same set of links Each MLD having its own set of common attributes Submission Slide 3 Abhishek P (Qualcomm), et. al.,
March 2020 doc.: IEEE 802.11-19/0358r2 Multiple MLDs for a set of links MLD 1 (L1, L2, L3) MLD 2 (L2, L3) MLD 3 (L1, L2) BSSID-x BSSID-y Link 1 o o Multiple BSSID set on L1 BSSID-p BSSID-q o BSSID-r Link 2 o o Multiple BSSID set on L2 BSSID-c o BSSID-a BSSID-b Link 3 o o Multiple BSSID set on L3 Submission Slide 4 Abhishek P (Qualcomm), et. al.,
March 2020 Thoughts on signaling a combination of Multiple BSSID set and MLDs doc.: IEEE 802.11-19/0358r2 A beacon for an AP would carry Multiple BSSID element (MBSSID IE) which provides information of all the virtual APs operating on the link Same as today 11ax multiple BSSID feature The beacon also carries Multi-link Attribute element which provides information of the advertising BSSID s MLD information and other links that are part of that AP MLD. Information of other links can be advertised as partial profile to prevent beacon bloating. A nontransmitted BSSID profile in the MBSSID IE would carry Multi-Link Attribute element which provides MLD information and partial profile for other links of that AP MLD Exact signaling details TBD. Submission Slide 5 Abhishek P (Qualcomm), et. al.,
March 2020 doc.: IEEE 802.11-19/0358r2 Co-Hosted BSSID set Further, APs of a co-hosted set would have similar considerations 11ax introduced the concept of co-hosted BSSID set for supporting legacy clients Each AP in a co-hosted BSSID set transmits its own beacon and probe response frames Highly inefficient compared to multiple BSSID set where a single beacon carries information for the set Operation permitted only for APs operating on 2.4/5 GHz Since each AP of a co-hosted set has different set of attributes, they can t be part of the same AP MLD. However, an AP of an MLD may be part of a co-hosted set of a link Submission Slide 6 Abhishek P (Qualcomm), et. al.,
March 2020 doc.: IEEE 802.11-19/0358r2 Summary This contribution discusses the support multi-link operation in conjunction with multiple BSSID set or co- hosted BSSID set operation on one or more links It is possible that an AP of an AP MLD corresponds to a nonTxBSSID in a multiple BSSID set on a link BSSIDs of a multiple BSSID cannot be part of the same AP MLD Similarly, an AP of an AP MLD may correspond to an AP in a co- hosted set on 2.4 or 5 GHz link Further APs of a co-hosted set cannot be part of the same AP MLD Submission Slide 7 Abhishek P (Qualcomm), et. al.,
March 2020 doc.: IEEE 802.11-19/0358r2 SP #1 Do you agree that an AP of an AP MLD can correspond to a transmitted BSSID or a nontransmitted BSSID in a multiple BSSID set on a link? Approved with unanimous consent Y: N: A: Submission Slide 8 Abhishek P (Qualcomm), et. al.,
March 2020 doc.: IEEE 802.11-19/0358r2 SP #2 Do you agree that APs belonging to the same multiple BSSID set cannot be part of the same AP MLD? Note: APs within a multiple BSSID set are, by definition, operating on the same channel Approved with unanimous consent Y: N: A: Submission Slide 9 Abhishek P (Qualcomm), et. al.,
March 2020 doc.: IEEE 802.11-19/0358r2 SP #3 Do you agree that APs belonging to the same co-hosted BSSID set cannot be part of the same AP MLD? Note: APs within a co-hosted BSSID set are, by definition, operating on the same channel Approved with unanimous consent Y: N: A: Submission Slide 10 Abhishek P (Qualcomm), et. al.,
March 2020 doc.: IEEE 802.11-19/0358r2 SP #4 Do you support that each AP of an AP MLD is independently configured to operate as transmitted or nontransmitted BSSID of a multiple BSSID set or as an AP of a co-hosted BSSID set? Y: N: A: Submission Slide 11 Abhishek P (Qualcomm), et. al.,
March 2020 doc.: IEEE 802.11-19/0358r2 Appendix Submission Slide 12 Abhishek P (Qualcomm), et. al.,
March 2020 doc.: IEEE 802.11-19/0358r2 Brief history of VAPs Types of VAPs Multiple BSSID set (same channel) Remark Introduced by 11v and extended by 11ax Efficient mechanism to advertise multiple VAPs 11be should consider re-using/extending this Introduced by 11ax for 6 GHz advertisement Multi-link can re-use this Time / amendment Co-Located AP set (same or different channel) Co-Hosted BSSID set (same channel) Introduced by 11ax for legacy compliance Each VAP transmits its own beacon (highly inefficient) 11be should not extend or use this due to its inefficiencies Introduced in 11be co-located AP concept can be extended for advertising link(s) Multi-Link (different channel) Submission Slide 13 Abhishek P (Qualcomm), et. al.,
