1. S-MIP:A Seamless Handoff Architecture for Mobile IP Robert Hsieh Zhe Guang Zhou Aruna Seneviratne School of Electrical Engineering and Telecommunications The University of New South Wales Sydney,2052,Australia In Proceedings of INFOCOM, San Francisco, USA, 2003. Speaker: Yung-Lin Yu

2. Outline Introduction Seamless handoff architecture –Design –S-MIP Network Architecture –Movement tracking and handoff algorithm Performance evaluation Conclusion

3. Introduction When a mobile node moves to another network –Obtain a new IP address –Terminated and re-connected Mobile IP provides host mobility management on the Internet

4. Introduction (cont.) The handoff latency in Mobile IP is primarily due to –The address resolution –The network registration Some proposals for minimizing the latency –Fast-handoff –Hierarchical network The paper presents an architecture to providing packet lossless handoff

5. Seamless handoff architecture Combination HMIP and FMIP –Uses MN ’ s location and movement patterns –Uses signal strength Decision Engine (DE) entity –Make handoff decision for its network domain –Receives feedback from ARs and maintains connected MNs in its domain and movement patterns –Load balancing

6. Seamless handoff architecture (cont.) Synchronized-Packet-Simulcast (SPS) scheme –Simulcast packets to current network and also to potential network which MN may asked to be moved

7. Seamless handoff architecture (cont.) S-MIP Network Architecture

8. Seamless handoff architecture (cont.) S-MIP defines six new additional message –Current Tracking Status (CTS) –Carrying Load Status (CLS) –Handoff Decision (HD) –Handoff Notification (HN) –Simulcast (Scast) –Simulcast off (Soff)

9. Seamless handoff architecture (cont.)

10. Movement Tracking and Handoff Algorithm –Location tracking –Movement pattern detection

11. Seamless handoff architecture (cont.) Location tracking –Activated upon a DE receiving its first CTS message –In Zone I Cannot be detected –In Zone II Use AR3 ’ s CLS msg. Use marginal coverage area –In Zone III Use triangulation technique

12. Seamless handoff architecture (cont.) Movement pattern detection –Use location tracking information –Assumption MN moves with a speed of 1m/s Sampling period is 1s

13. Performance evaluation Simulation performance result –Goal Examine packet loss Examine packet re-ordering behavior

14. Performance evaluation (cont.) –Simulation network topology

15. Performance evaluation (cont.) –Handoff result for S-MIP

16. Performance evaluation (cont.) Signaling cost analysis –The seamless handoff setting message Identify with the HMIPv6 with Fast-handoff –Movement tracking message CLS message –AR to DE CTS message –MN to DE via AR CLS and CTS occur only in wired portion –Have far more bandwidth resources

17. Conclusion In this paper, It present a combined schema can provide lossless handovers at IP layer In future work, complex multiple connection scenarios is needed