Next Generation WLANs: IEEE 802.11-24/390r0 Link Reconfiguration Signaling Design
Discover the signaling design for seamless roaming in next-generation WLANs with IEEE 802.11-24/390r0. Explore the framework based on link reconfiguration and procedural overview for seamless roaming procedures. Learn about signaling details and examples for preparation and execution phases in WLAN environments.
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August 2024 doc.: IEEE 802.11-24/390r0 Link Reconfiguration Signaling Design for Next Generation WLANs 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 802.11-24/390r0 Abstract In this contribution, we discuss link reconfiguration framework based design for seamless roaming in next generation WLANs Signaling design and frame contents Examples based on the signaling for different use cases discussed in 11bn Submission Slide 2 Peshal Nayak, Samsung Research America
August 2024 doc.: IEEE 802.11-24/390r0 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 802.11-24/390r0 Signaling Details for Preparation and Execution In our last contribution [1], we proposed an enhancement to 11be link reconfiguration request and response frames to perform preparation and execution. In this contribution, we provide further details on the signaling Further, we provide some examples of how the signaling can be used in: Preparation and execution phases when both are done Preparation and execution done with an SN reset Preparation done through target AP MLD Submission Slide 4 Peshal Nayak, Samsung Research America
August 2024 doc.: IEEE 802.11-24/390r0 Signaling details: Reconfiguration Request frame Target AP MLD to roam to. Must be in the same SMD as current AP MLD. Modified Reconfiguration request frame format Order 1 2 3 4 5 6 7 8 Meaning Category Protected UHR Action Dialog token Target AP MLD identifier Action indicator field Context to be transferred Reconfiguration Multi-link element OCI element Near static Dynamic reset Context pull Roam Reserved/TBD Bits: 1 1 1 1 4 Compilation of individual bits for each feature/context set to 1/0 values Indicate per-STA profile of target AP that needs to be added. Missing in execution phase if preparation phase is completed. Submission Slide 5 Peshal Nayak, Samsung Research America
August 2024 doc.: IEEE 802.11-24/390r0 Signaling Details: Reconfiguration Response Frame Modified Reconfiguration response frame format Order 1 2 Protected UHR Action 3 4 AID (optional) 5 Transferred context indication 6 Operation parameters 7 Deadline/Timeout 8 Suggested parameters 9 10 Reconfiguration Status List 11 Group Key Data (optional) 12 OCI element (optional) 13 Basic Multi-link element (optional) Ideally AID should not change. But this can cause some complications. So a simple option is to include AID in response when response is for roam execution phase. Meaning Category Compilation of individual bits for each feature/context set to 1/0 values successfully transferred to target AP MLD Dialog Token Operation parameters needed for each feature if transferred. Examples: SCS: SCS descriptor element that carries only SCS ID, service start time, service start time link ID (remaining optional fields skipped), EPCS: priority access ML element. Deadline to roam after preparation phase is completed/timeout after execution phase is completed. Count 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 bound values for SCS setup Submission Slide 6 Peshal Nayak, Samsung Research America
August 2024 doc.: IEEE 802.11-24/390r0 Example 1: preparation phase + execution phase PREP Resp: Modified Reconfiguration response frame format Order 1 2 Protected UHR Action 3 4 5 Transferred context indication 6 Operation parameters 7 8 Suggested parameters 10 11 Reconfiguration Status List 12 Group Key Data (optional) 13 OCI element (optional) 14 Basic Multi-link element (optional) PREP Req: Modified Reconfiguration request frame format Order 1 Category 2 Protected UHR Action 3 Dialog token 4 Target AP MLD identifier 5 Action indicator field: NS 6 Context to be transferred 7 Reconfiguration Multi-link element 8 OCI element Current AP Meaning Category STA Meaning Prep req Dialog Token AID (optional) Interaction with target Roam Deadline Prep resp Count EXE Req: Modified Reconfiguration request frame format EXE Resp: Modified Reconfiguration response frame format Order 1 2 Protected UHR Action 3 4 AID (Not present if provided in prep phase) 5 Meaning Category Order 1 2 3 4 5 Meaning Exe req Category Protected UHR Action Dialog token Target AP MLD identifier Action indicator field: R Interaction with target Dialog Token Timeout Exe resp Submission Slide 7 Peshal Nayak, Samsung Research America
August 2024 doc.: IEEE 802.11-24/390r0 Example 2: Preparation phase + execution phase with SN reset PREP Resp: Modified Reconfiguration response frame format Order 1 2 Protected UHR Action 3 4 5 Transferred context indication 6 Operation parameters 7 8 Suggested parameters 10 11 Reconfiguration Status List 12 Group Key Data (optional) 13 OCI element (optional) 14 Basic Multi-link element (optional) Meaning Category PREP Req: Modified Reconfiguration request frame format PREP Req: Modified Reconfiguration request frame format Order 1 Category 2 Protected UHR Action 3 Dialog token 4 Target AP MLD identifier 5 Action indicator field: NS + DR 6 Context to be transferred 7 Reconfiguration Multi-link element 8 OCI element Current AP STA Meaning Dialog Token AID (optional) Prep req Interaction with target Roam Deadline Prep resp Count EXE Resp: Modified Reconfiguration response frame format Order 1 2 Protected UHR Action 3 4 5 EXE Req: Modified Reconfiguration request frame format EXE Req: Modified Reconfiguration request frame format Meaning Category Order 1 2 3 4 5 Meaning Exe req Category Protected UHR Action Dialog token Target AP MLD identifier Action indicator field: R Dialog Token AID (optional) Timeout Interaction with target Exe resp Submission Slide 8 Peshal Nayak, Samsung Research America
August 2024 doc.: IEEE 802.11-24/390r0 Example 3: preparation through target AP Prep req: Modified Reconfiguration response frame format Prep req: Modified Reconfiguration request frame format Target AP STA Order 1 2 3 4 5 6 8 10 12 12 13 14 Meaning Category Order 1 2 3 4 5 6 7 8 Meaning Category Protected UHR Action Dialog token Target AP MLD identifier old AP Action indicator field: CP + R Context to be transferred Reconfiguration Multi-link element OCI element Protected UHR Action Dialog Token AID (optional) Transferred context indication Operation parameters Suggested parameters Count Reconfiguration Status List Group Key Data (optional) OCI element (optional) Basic Multi-link element (optional) Exe(+prep) req Interaction with previous AP MLD Exe(+prep) resp Submission Slide 9 Peshal Nayak, Samsung Research America
August 2024 doc.: IEEE 802.11-24/390r0 Conclusion In this contribution we discuss the signaling for seamless roaming based on link reconfiguration framework We further discuss the example use cases and how the signaling can be used in those use cases Submission Slide 10 Peshal Nayak, Samsung Research America
August 2024 doc.: IEEE 802.11-24/390r0 References [1] IEEE 802.11-25/388, Link Reconfiguration Framework for Preparation and Execution Phases of Seamless Roaming Submission Slide 11 Peshal Nayak, Samsung Research America
