Thoughts on Seamless Roaming in Non-Collocated AP MLD Architecture
Explore a new roaming approach under a non-collocated AP MLD architecture for seamless transitions between APs without interrupting data transmission. Understand definitions, network topologies, and compatibility issues in this innovative framework.
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doc.: IEEE 802.11-23/0231r0 Thoughts on Seamless Roaming Under Non-collocated AP MLD Architecture Date: 2023-02-20 Authors: Affiliations Address Phone email Name Guogang Huang huangguogang1@huawei.com Yuchen Guo Huawei Yunbo Li Yousi Lin Ming Gan Submission Slide 1 Guogang Huang, Huawei Technologies Inc.
doc.: IEEE 802.11-23/0231r0 Introduction A new roaming approach under a non-collocated AP MLD architecture is proposed in [1]. The proposed approach would enable seamless transition from the current collocated AP MLD to another collocated AP MLD without interrupting the data transmission. In this presentation, we share some thoughts on this non-collocated AP MLD architecture. Submission Slide 2 Guogang Huang, Huawei Technologies Inc.
doc.: IEEE 802.11-23/0231r0 Definitions Collocated AP MLD An AP MLD where all affiliated APs are co-located with each other. Non-collocated AP MLD An AP MLD that is not a collocated AP MLD. And the UMAC is not co-located with the corresponding LMAC. Submission Slide 3 Guogang Huang, Huawei Technologies Inc.
doc.: IEEE 802.11-23/0231r0 Example Network Topology Compatibility issue for EHT non-AP MLD and UHR non-AP MLD The EHT non-AP MLD only can associate with the collocated AP MLD. Otherwise, it will be confused by the same link ID but with different BSSIDs The UHR non-AP MLD can associate with either the collocated AP MLD or the non- collocated AP MLD Non-802.11 DS SAP + DSAF Interface between UHR AP MLD UMAC and UHR AP MLD LMAC Portal Data from/to UHR non-AP MLD UHR AP MLD UMAC Data from/to EHT non-AP MLD Data from/to EHT non-AP MLD Wired or wireless backhaul connection UHR non-Collocated AP MLD EHT AP MLD UMAC EHT AP MLD UMAC TID-to-link Mapping /Link Merging TID-to-link Mapping Link Merging ... UHR Collocated AP MLD 1 UHR Collocated AP MLD M ... ... LMAC LMAC LMAC LMAC ... PHY of affiliated AP 0 PHY of affiliated AP N ... PHY of affiliated AP 0 PHY of affiliated AP N Link 0 Link N Link 0 Link N Submission Slide 4
doc.: IEEE 802.11-23/0231r0 Example Network Topology (Cont.) The UHR non-AP MLD can distinguish links of the same non- collocated AP MLD through the tuple (MLD MAC Address of Collocated AP MLD, link ID) Non-802.11 DS SAP + DSAF Interface between UHR AP MLD UMAC and UHR AP MLD LMAC Portal Data from/to UHR non-AP MLD UHR AP MLD UMAC Data from/to EHT non-AP MLD Data from/to EHT non-AP MLD Wired or wireless backhaul connection UHR non-Collocated AP MLD EHT AP MLD UMAC EHT AP MLD UMAC TID-to-link Mapping /Link Merging TID-to-link Mapping Link Merging ... UHR Collocated AP MLD 1 UHR Collocated AP MLD M ... ... LMAC LMAC LMAC LMAC ... PHY of affiliated AP 0 PHY of affiliated AP N ... PHY of affiliated AP 0 PHY of affiliated AP N Link 0 Link N Link 0 Link N Submission Slide 5 Guogang Huang, Huawei Technologies Inc.
doc.: IEEE 802.11-23/0231r0 Example Network Topology (Cont.) For the UHR non-AP MLD associated with a non-collocated AP corresponding the resides in the UHR AP MLD UMAC of the non-collocated AP MLD, which may be resided in a portal Authentication, Association SN and PN assignment Encryption/Decryption BA buffering and reordering per SN Replay detection Per PN Note whether the Detection per SN Scoreboarding reside in the non-collocated AP MLD UMAC depends on whether allowing a TID to be mapped to more than one collocated AP MLD MLD, following the context operations (U) (C) Legend: (M) MAC SAP (U) Uncontrolled port (C) - Controlled port IEEE 802.1X Controlled and Uncontrolled Port Filtering (optional) (M) RX/TX MSDU Rate Limiting A-MSDU MSDU Flow - Transmitting MSDU Flow Receiving Aggregation (TX) / De-aggregation (RX) Replay Detection Per PN (optional) PS Defer Queuing1 (AP MLD Only) UHR AP MLD UMAC Block Ack Buffering and Reordering per SN Sequence Number Assignment MPDU Decryption Packet Number Assignment Duplicate Detection per SN Block Ack Scoreboarding MPDU Encryption functions and Duplicate Block Interface of AP MLD upper MAC sublayer and MLD lower MAC sublayer Ack Submission Slide 6 Guogang Huang, Huawei Technologies Inc.
doc.: IEEE 802.11-23/0231r0 Non-collocated AP MLD Discovery If a collocated AP MLD is affiliated with a non-collocated AP MLD, then each AP affiliated with this collocated AP MLD shall include the corresponding MLD MAC address of the non-collocated AP MLD in the Basic Multi-link element of the Beacon frame Similarly, if a reported AP in the Reduced Neighbor Report (RNR) element is affiliated with a non-collocated AP MLD, then a non-collocated AP MLD ID (or the corresponding MLD MAC address of the non-collocated AP MLD) shall be included within a newly defined Extended MLD Parameters subfield. To avoid the Beacon bloating, each affiliated AP shall include the info of other APs affiliated with the same collocated AP MLD in the RNR element. And the info on other APs affiliated with a different collocated AP MLD is optionally included in the RNR element Submission Slide 7 Guogang Huang, Huawei Technologies Inc.
doc.: IEEE 802.11-23/0231r0 Multi-link Reconfiguration vs. BSS Transition The BTM frames can be reused to trigger the multi-link reconfiguration with neighboring collocated AP MLDs which affiliate with the same non- collocated AP MLD. Non-collocated AP MLD 1 Collocated AP MLD For an UHR non-AP MLD associated with a non-collocated AP MLD, the BSS transition only happens at the junction (red part shown in the right figure) of different non-collocated AP MLDs if an ESS is divided into more than one non-collocated AP MLD. Non-collocated AP MLD 2 Submission Slide 8 Guogang Huang, Huawei Technologies Inc.
doc.: IEEE 802.11-23/0231r0 Open Discussion The challenge to enable the non-collocated AP MLD architecture is to standardize the interface between the non-collocated AP MLD UMAC and the non-collocated AP MLD LMAC. In 802.11 organization? In other industry alliance? Submission Slide 9 Guogang Huang, Huawei Technologies Inc.
doc.: IEEE 802.11-23/0231r0 Conclusions We have discussed the non-collocated AP MLD architecture which allows seamless roaming without interrupting the data transmission. We covered the following aspects Compatibility Issue. The EHT non-AP MLD only can associate with the collocated AP MLD. Discovery of non-collocated AP MLD Challenge. Standardize the interface between the non-collocated AP MLD UMAC and the non-collocated AP MLD LMAC Submission Slide 10 Guogang Huang, Huawei Technologies Inc.
doc.: IEEE 802.11-23/0231r0 References [1] Duncan, et al. Seamless Roaming for UHR, DCN 11-22/1910r1 Submission Slide 11 Guogang Huang, Huawei Technologies Inc.
doc.: IEEE 802.11-23/0231r0 Appendix Network Topology (considering pre-EHT STA) Non-802.11 DS SAP + DSAF Interface between UHR AP MLD UMAC and UHR AP MLD LMAC Portal Data from/to UHR non-AP MLD Data from/to pre- EHT STA UHR Non-collocated AP MLD Data from/to pre-EHT STA UHR AP MLD UMAC Data from/to pre-EHT STA Data from/to EHT non-AP MLD Data from/to EHT non-AP MLD Data from/to pre-EHT STA Wired or wireless backhaul connection Non-MLD UMAC EHT AP MLD UMAC Non-MLD UMAC Non-MLD UMAC EHT AP MLD UMAC Non-MLD UMAC TID-to-link Mapping /Link Merging TID-to-link Mapping Link Merging ... UHR Collocated AP MLD 1 UHR Collocated AP MLD M ... ... LMAC LMAC LMAC LMAC ... PHY of affiliated AP 0 PHY of affiliated AP N ... PHY of affiliated AP 0 PHY of affiliated AP N Link 0 Link N Link 0 Link N Submission Slide 12 Guogang Huang, Huawei Technologies Inc.
