Explore seamless handover implementation in WLAN technology with IEEE 802.11 protocol and Mobile IP, detailing experiences, system architecture, single and multiple radio handover methods, and roaming considerations for efficient network transitions.
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January 2024 doc.: IEEE 802.11-24/0106r0 Seamless Roaming Consideration Date: 2024-01-13 Authors: Name Hitoshi Morioka Affiliations SRC Software Address Fukuoka JAPAN Phone email hmorioka@src-soft.com Submission Slide 1 Hitoshi Morioka (SRC Software)
January 2024 doc.: IEEE 802.11-24/0106r0 Abstract This presentation shares our experiences of seamless handover implementation. Submission Slide 2 Hitoshi Morioka (SRC Software)
January 2024 doc.: IEEE 802.11-24/0106r0 Our Experiences We have implemented WLAN seamless handover system from 20 years ago. We would like to share our experiences. Our system L2: IEEE 802.11 WLAN L3: Mobile IP Submission Slide 3 Hitoshi Morioka (SRC Software)
January 2024 doc.: IEEE 802.11-24/0106r0 Mobile IP Dst: Home Address Register Care of Address Src: Correspondent Node Correspondent Node Home Agent Home Address Internet Dst: Care of Address Src: Home Agent Dst: Correspondent Node Src: Home Address Dst: Home Address Src: Correspondent Node Encapsulate AP1 AP2 Switching AP disrupts communication Mobile Node Care of Address Submission Slide 4 Hitoshi Morioka (SRC Software)
January 2024 doc.: IEEE 802.11-24/0106r0 Single Radio Seamless Handover 1. 2. 3. Mobile Node (MN) communicates through AP1. MN finds AP2 and associates with it. (keep using AP1 link) In certain condition, MN decides to use AP2 link. (implementation dependent) MN registers its Care of Address to Home Agent. MN transmits packets to AP2 while MN can receive packets from both AP1 and AP2. This means MN can receive delayed packets from AP1. (No packet losses) In certain condition, MN decides to disconnect from AP1. (implementation dependent) APs must be operated on the same channel AP1 AP2 4. 5. 6. Radio Virtual Interface Virtual Interface Mobile Node Submission Slide 5 Hitoshi Morioka (SRC Software)
January 2024 doc.: IEEE 802.11-24/0106r0 Multiple Radio Seamless Handover Different channel Multiple radio to support multiple channels. Same channel Same channel AP1 AP2 AP3 AP4 Radio Radio Virtual Interface Virtual Interface Virtual Interface Virtual Interface Mobile Node Submission Slide 6 Hitoshi Morioka (SRC Software)
January 2024 doc.: IEEE 802.11-24/0106r0 Roaming Consideration Our system have achieved seamless handover on the existing IEEE 802.11 with Mobile IP. Obviously Mobile IP is a L3 protocol and it does not fit to IEEE 802.11 roaming. Considering about roaming in a DS, TX from non-AP MLD is simple. Just use preferred link. RX on non-AP MLD needs notification to DS where the non-AP MLD locates. Non-AP MLD can notify its location by transmitting a broadcast frame to DS. (e.g Gratuitous ARP/NDP) Seamless roaming can be realized by existing IEEE 802.11. Just a non-AP MLD implementation issue. Do we need new standards for seamless roaming? Slide 7 Submission Hitoshi Morioka (SRC Software)
January 2024 doc.: IEEE 802.11-24/0106r0 Reference H. Morioka, H. Mano, M. Ohmori, M. Ohta, M. Hirabaru, M. Hasegawa, M. Inoue, "Seamless Handover with Wireless LAN, Mobile IP, MISP and PDMA", The 9th International Symposium on Wireless Personal Multimedia Communications, 2006 Submission Slide 8 Hitoshi Morioka (SRC Software)
