Seamless Roaming Framework in IEEE 802.11-24/388r0 Document
Explore the innovative Seamless Roaming Framework discussed in the August 2024 document IEEE 802.11-24/388r0. The framework covers signaling, link reconfiguration, and procedural overviews for preparation and execution phases, enhancing the roaming experience for non-AP MLD devices.
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August 2024 doc.: IEEE 802.11-24/388r0 Link Reconfiguration Framework for Preparation and Execution Phases of Seamless Roaming Date: 2024-08-06 Authors: Name Peshal Nayak Affiliations Samsung Address Phone email p.nayak@samsung.com Bilal Sadiq Vishnu Ratnam Rubayet Shafin Yue Qi Boon Loong Ng Submission Slide 1 Peshal Nayak, Samsung Research America
August 2024 doc.: IEEE 802.11-24/388r0 Abstract In this contribution, we discuss signaling for preparation and execution phases for seamless roaming Extension to 11be link reconfiguration framework Additional information that can be carried in the link reconfiguration request and response frames Submission Slide 2 Peshal Nayak, Samsung Research America
August 2024 doc.: IEEE 802.11-24/388r0 Seamless Roaming Procedural Overview TGbn has agreed to define procedures that enable a non- AP MLD to roam from current AP MLD to target AP MLD while remaining in state 4. A number of contributions have discussed various procedures for seamless roaming (summarized in the table) A number of target use cases/scenarios have also been discussed so far: Preparation of target AP MLD links through current AP MLD prior to roaming Preparation (context transfer) done through target AP MLD Phase Purpose Enh. Discovery Domain AP info gathering Recommendation Info gathering for candidate AP assessment considering: Context Load, etc. Preparation Prepare 1 target AP MLD for roaming (more than one is TBD) Near static context transfer Execution Initiate transition procedures: Dynamic context transfer DS remapping Buffered data handling Handling buffered data at current AP Can be considered a part of the above stage Submission Slide 3 Peshal Nayak, Samsung Research America
August 2024 doc.: IEEE 802.11-24/388r0 Signaling Details for Preparation and Execution A signaling framework that can be used across all the use cases/scenarios is needed. In this contribution, we discuss the signaling for preparation and execution phases based on an extension of the link reconfiguration concept defined in 11be. Submission Slide 4 Peshal Nayak, Samsung Research America
August 2024 doc.: IEEE 802.11-24/388r0 Link Reconfiguration Framework in 11be Link reconfiguration framework in 11be allows a non-AP MLD to add/delete links with its AP MLD. The non-AP MLD can transmit a link reconfiguration request frame and AP MLD can transmit a link reconfiguration response frame Submission Slide 5 Peshal Nayak, Samsung Research America
August 2024 doc.: IEEE 802.11-24/388r0 Link Reconfiguration Request and Response Frames Overview Link reconfiguration req Link reconfiguration resp Reconfiguration Status List Basic ML element Group Key Data Reconfiguration ML element Common Info Per-STA profiles Reconfig Status Duple Common Info Per-STA Profile STA control STA Info STA Profile Link ID Complete profile of the AP on the added link Status Reconfiguration operation type Complete profile of a STA Link ID Submission Slide 6 Peshal Nayak, Samsung Research America
August 2024 doc.: IEEE 802.11-24/388r0 Signaling Details Submission Slide 7 Peshal Nayak, Samsung Research America
August 2024 doc.: IEEE 802.11-24/388r0 Link Reconfiguration for Seamless Roaming The link reconfiguration framework concept can be used for designing signaling for preparation and execution phases of seamless roaming: Non-AP MLD transmits a modified link reconfiguration request to the current AP MLD to add links at the target AP MLD This can result in transfer of context to the target AP MLD Target AP MLD and current AP MLD must be from the same UHR seamless roaming domain. Context transfer Submission Slide 8 Peshal Nayak, Samsung Research America
August 2024 doc.: IEEE 802.11-24/388r0 Additional Information to include in Reconfiguration Request Frame AP MLD identifier: Can be set to target AP MLD identifier when performing roaming through current AP MLD. Can be set to current AP MLD when performing roaming through target AP MLD. Alternatively, this can be carried in a separate field. Action/type indicator: Can indicate if the request frame is meant for preparation/execution phase. Context to be transferred: Non-AP MLD can indicate to the current AP MLD, the context that it intends to have transferred to the target AP MLD. Submission Slide 9 Peshal Nayak, Samsung Research America
August 2024 doc.: IEEE 802.11-24/388r0 Additional Information to include in Reconfiguration Response Frame AID: Non-AP MLD can be assigned an AID Transferred context indication: Indication of what near static context were successfully transferred to the target AP MLD. Operational parameters: Operational parameters needed for SCS, EPCS setups if transferred from current AP MLD to the target AP MLD. Suggested parameters: If context is rejected at target AP MLD, then suggested value to help non-AP MLD to renegotiate and converge faster at target AP MLD. E.g., suggested delay bounds for rejected SCSs. Submission Slide 10 Peshal Nayak, Samsung Research America
August 2024 doc.: IEEE 802.11-24/388r0 Conclusion In this contribution we a link reconfiguration framework for seamless roaming in next generation WLANs Extend the 11be concept to perform seamless roaming Information items that can be carried in the link reconfiguration request and response frames Submission Slide 11 Peshal Nayak, Samsung Research America
