Announcements CMPE 257 Wireless and Mobile Networking Homework on MAC due 05 06 Midterm moved to 05 10 Spring 2005 Wireless Internetworking II CMPE 257 Spring 2005 1 2 TCP Performance in MobileIP Choong Today CMPE 257 Spring 2005 Finish Mobile IP FLIP How does TCP perform atop Mobile IP What additional overhead is introduced by Mobile IP CMPE 257 Spring 2005 3 Tunneling encapsulation Fragmentation Triangle routing Handoffs CMPE 257 Spring 2005 4 1 Example Triangle routing Goal Source of overhead Additional processing at HA and FA Additional delay due to triangulation CMPE 257 Spring 2005 Combined overhead sources Individual overhead sources 5 Methodology Determine impact on TCP performance CMPE 257 Spring 2005 Summary of Results Several scenarios that compound isolate overhead sources Baseline scenario Compare performance between scenario pairs FTP transfer between MH and CH Metric TCP throughput Dogleg routing as main cause of TCP throughput degradation Solution route optimization Handoff is second Mobile IP s inherent delay in re establish connectivity with new FA Solutions CMPE 257 Spring 2005 6 7 Increase frequency of router advertisements Use link layer information to trigger handoff CMPE 257 Spring 2005 8 2 FLIP Solis CMPE 257 Spring 2005 9 3
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