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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
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
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
Contents
Problem Description Integrated Networks Proposed Solution TCP over 2.5G/3G Networks ComNets Testbed Future Research
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
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
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
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
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
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)
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
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
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
Network Simulation with NS-2
Screenshot from the Network Animator (NAM)
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
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
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
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.
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