1. Parmesh Ramanathan University of Wisconsin, Madison parmesh@ece.wisc.edu Mobility Management in GENI WiMAX

2. Handoff Scenarios Both basestations (BS) are in the same IP subnet Both BS in different IP subnets A new Layer 3 –e.g., Mobility First GENI Airspan BS do not have Layer 2 handover software –All three scenarios need Layer 2 handover 2

3. Layer 2 Handoff Schemes Break and Make –Mobile node breaks its connection with current WiMAX BS and then establishes connection with the new WiMAX BS –No new software needed –Handoff latency We need to measure Make and Break –Mobile node needs two interfaces Yellow nodes have this capabilities Can most laptops also support two interfaces? –In the simplest form, one interface always connects to BS1 while the other connects to BS2 (whenever possible) –Requires some s/w at the mobile node 3

4. Layer 3 Handoff Schemes Minimal solution –S/w on controller node re-routes through new BS after IP address re-write –Does not allow initiation of incoming connection to mobile node (e.g. incoming Skype call) 4 BS1 BS2 To Internet OpenFlow Router Mobile node Subnet 1 Subnet 2

5. Layer 3 Handoff Schemes General solution –Open source mobile IP s/w (Transparent Mobile IP) http://sourceforge.net/projects/tmip/ –Presently working with this s/w –Needs OpenFlow s/w in mobile node to de- encapsulate IP packets 5 BS1 BS2 To Internet OpenFlow Router Mobile node Subnet 1 Subnet 2

6. Timeline Yellow Node with two interfaces doing handover between two BS in the same subnet Transparent MobileIP working to implement a baseline Layer 3 handover scheme Support new Layer 3 solutions like Mobility First Demonstrate heterogeneous network handovers 6