S-MIP:A Seamless Handoff Architecture for Mobile IP

Robert HsiehZhe Guang ZhouAruna Seneviratne

School of Electrical Engineering and TelecommunicationsThe University of New South Wales Sydney,2052,AustraliaIn Proceedings of INFOCOM, San Francisco, USA, 2003.

Speaker: Yung-Lin Yu

Outline

• Introduction

• Seamless handoff architecture– Design– S-MIP Network Architecture– Movement tracking and handoff algorithm

• Performance evaluation

• Conclusion

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

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

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 con

nected MNs in its domain and movement patterns

– Load balancing

Seamless handoff architecture (cont.)

• Synchronized-Packet-Simulcast (SPS) scheme– Simulcast packets to current network and also t

o potential network which MN may asked to be moved

Seamless handoff architecture (cont.)

• S-MIP Network Architecture

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)

Seamless handoff architecture (cont.)

Seamless handoff architecture (cont.)

• Movement Tracking and Handoff Algorithm– Location tracking– Movement pattern detection

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

Seamless handoff architecture (cont.)

• Movement pattern detection– Use location tracking information– Assumption

• MN moves with a speed of 1m/s

• Sampling period is 1s

Performance evaluation

• Simulation performance result– Goal

• Examine packet loss

• Examine packet re-ordering behavior

Performance evaluation (cont.)– Simulation network topology

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

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

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