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Universität Brem en

Stefan Aust, Nikolaus Fikouras, Carmelita Görg ITG-Fachgruppe 5.2.4Kamp-Lintfort, 20.6.01

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

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Universität Brem en

Stefan Aust, Nikolaus Fikouras, Carmelita Görg ITG-Fachgruppe 5.2.4Kamp-Lintfort, 20.6.01

Contents

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

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Universität Brem en

Stefan Aust, Nikolaus Fikouras, Carmelita Görg ITG-Fachgruppe 5.2.4Kamp-Lintfort, 20.6.01

Problem Description

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

M obility

TAXI

TAXITAXI

Outdoors

M obility

OfficeHom e

Internet

WL

AN

Wir

elin

ed

UM

TS

/GS

M

Ad

ho

c

c nom ets

c no m e ts Kom m unikationsnetze

Universität Brem en

Stefan Aust, Nikolaus Fikouras, Carmelita Görg ITG-Fachgruppe 5.2.4Kamp-Lintfort, 20.6.01

Integrated Networks

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) T A X IT A X I

Access Devices

Personal Computer

Switch between devices

Mobile PhoneIn-car facilitiesTelevision

W LAN / Ad-hoc

GSM / UMTS

Ethernet / ADSL

M obility

M obility

M obility

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Universität Brem en

Stefan Aust, Nikolaus Fikouras, Carmelita Görg ITG-Fachgruppe 5.2.4Kamp-Lintfort, 20.6.01

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

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Universität Brem en

Stefan Aust, Nikolaus Fikouras, Carmelita Görg ITG-Fachgruppe 5.2.4Kamp-Lintfort, 20.6.01

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)

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Universität Brem en

Stefan Aust, Nikolaus Fikouras, Carmelita Görg ITG-Fachgruppe 5.2.4Kamp-Lintfort, 20.6.01

ComNets Testbed

Statio na ry N o de

Fo re ig nA g e ntFo re ig n A ge nt

Hom eAgent

F ire w a ll

E thernet

802.11GSM

Fo re ig nA g e nt

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Universität Brem en

Stefan Aust, Nikolaus Fikouras, Carmelita Görg ITG-Fachgruppe 5.2.4Kamp-Lintfort, 20.6.01

Network Simulation with NS-2

Screenshot from the Network Animator (NAM)

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Universität Brem en

Stefan Aust, Nikolaus Fikouras, Carmelita Görg ITG-Fachgruppe 5.2.4Kamp-Lintfort, 20.6.01

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

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Universität Brem en

Stefan Aust, Nikolaus Fikouras, Carmelita Görg ITG-Fachgruppe 5.2.4Kamp-Lintfort, 20.6.01

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.