Mobility Management in Integrated Network Platforms

1. Mobility Management in Integrated Network Platforms Stefan Aust, Nikolaus Fikouras and Carmelita Görg ComNets, University of Bremen, Germany {aust,niko,cg}@comnets.uni-bremen.de

2. Contents • Problem Description • Integrated Networks • Proposed Solution • TCP over 2.5G/3G Networks • ComNets Testbed • Future Research

3. Wide range of access networks Wide range of devices Different devices in every environment Separate devices for data and tele-communications Internet is not mobile enabled Problem Description

4. Global Roaming Integration of access networks Wireless and wire-lined Option of ad hoc networks Access Freedom Integration of data and tele- communications Personal Mobility (between devices) Integrated Networks

5. Proposed Solution • A solution should be based on the Internet Protocol • Integrates hetero/homogeneous networks • Bearer for data/telecommunications • Global Roaming • Mobile Internet Protocol • Internet roaming • Transparent to higher layers • Does not interrupt communications • Access Freedom • Session Initiation Protocol • Personal mobility • Terminal-type negotiation • Terminal capability negotiation • Caller and callee authentication • Multicast support

6. TCP/IP over 2.5G/3G Networks • Optimization Mechanisms for TCP over 2.5G/3G networks • Large window size • Large initial window • MTU larger than default IP MTU (Maximum Transfer Unit) • Path MTU discovery • Selective acknowledgments (SACK) • Explicit congestion notification (ECN) • Comparison between TCP over 2.5G/3G networks and WAP Wireless Profiled TCP (WP-TCP) • Selective acknowledgment (TCP-SHOULD, WAP-MUST)

7. ComNets Testbed

8. Network Simulation with NS-2 Screenshot from theNetwork Animator (NAM)

9. Future Research • Multi-interface end-devices • Mobile IP provides mobility management for the total of communications • End-devices should utilise multiple interfaces simultaneously • Bandwidth Aggregation, QoS, Cost, Local Services, Distance to peer • Mobile Aware Stacks • Mobile IP is a transparent solution • Other layers are not mobile aware • Other layers provide resistances to mobility • Improve performance through mobile awareness • Ad hoc networks • Heterogeneous, multi-hop, Internet compatible • Investigate performance • Personal Mobility, Security Requirements, Service Location

10. Publications • N. A. Fikouras and C. Görg. Performance Comparison of Hinted and Advertisement Based Movement Detection Methods for Mobile IP Hand-offs. In Proceedings of the European Wireless 2000, Dresden, Germany, September 2000. • N. A. Fikouras and C. Görg. Performance Comparison of Hinted and Advertisement Based Movement Detection Methods for Mobile IP Hand-offs. Communication Networks, 2001. To Appear in Elsevier Science, Communication Networks. • N. A. Fikouras, C. Görg, and I. Fikouras. Achieving Integrated Network Platforms through IP. In Proceedings of the Wireless World Research Forum Kick-Off Meeting 2001 (WWRF), Munich, Germany, March 2001. IST. • N. A. Fikouras, A. J. Könsgen, and C. Görg. Accelerating Mobile IP Hand-offs through Link-layer Information, An Experimental Investigation with 802.11b and Internet Audio. In Proceedings of the International Multiconference on Measurement, Modelling, and Evaluation of Computer-Communication Systems (MMB), Aachen, Germany, September 2001.