Seamless Roaming Procedures for IEEE 802.11 Networks
Explore the seamless roaming procedures outlined in IEEE 802.11-24/391r0 document for efficient transition of non-AP MLD between access points. The process involves preparation and execution in a single step, ensuring uninterrupted connectivity during the roaming process.
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August 2024 doc.: IEEE 802.11-24/391r0 Single Step Preparation and Execution for 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 802.11-24/391r0 Abstract In this contribution, we discuss a case for performing preparation and execution in a single step Description of the use case Example of how signaling can work Submission Slide 2 Peshal Nayak, Samsung Research America
August 2024 doc.: IEEE 802.11-24/391r0 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 802.11-24/391r0 Single Step Preparation and Execution STA Current AP Target AP A non-AP MLD may not have the time to perform preparation in some cases. E.g., sudden drop in RSSI. Consequently, the non-AP MLD may have to perform preparation and execution in a single step. In our previous contribution[1-2], we discussed the details of signaling design. Next, we show the example operation based on that signaling Preparation + Execution req AP to AP communication Preparation + Execution response STA transitions to target AP STA communicates with Target AP Submission Slide 4 Peshal Nayak, Samsung Research America
August 2024 doc.: IEEE 802.11-24/391r0 Example Operation: Execution and preparation in single step STA Current AP EXE Resp: Modified Reconfiguration response frame format Order 1 2 Protected UHR Action 3 4 AID (optional) 5 Transferred context indication 6 Operation parameters 8 Suggested parameters 10 11 Reconfiguration Status List 12 Group Key Data (optional) 13 OCI element (optional) 14 Basic Multi-link element (optional) EXE Req: Modified Reconfiguration request frame format Meaning Category Order 1 2 3 4 5 6 7 8 Meaning Exe req Category Protected UHR Action Dialog token Target AP MLD identifier Action indicator field: NS + R Context to be transferred Reconfiguration Multi-link element OCI element Interaction with target Dialog Token Exe resp Count Submission Slide 5 Peshal Nayak, Samsung Research America
August 2024 doc.: IEEE 802.11-24/391r0 Conclusion In this contribution we discuss a use case for performing preparation and execution in a single step. We discuss the signaling and show an example operation. Submission Slide 6 Peshal Nayak, Samsung Research America
August 2024 doc.: IEEE 802.11-24/391r0 References [1] IEEE 802.11-25/388, Link Reconfiguration Framework for Preparation and Execution Phases of Seamless Roaming [2] IEEE 802.11-25/390, Link Reconfiguration Signaling Design for Next Generation WLANs Submission Slide 7 Peshal Nayak, Samsung Research America
