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Simulation Model for End-to-end QoS across Heterogeneous Networks. C. Cicconetti and G. Stea , University of Pisa, Italy G. Garcia de Blas, Telefónica I+D, Spain X. Masip, Technical University of Catalunya, Spain J. Sá Silva, University of Coimbra, Portugal

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simulation model for end to end qos across heterogeneous networks

Simulation Model for End-to-end QoS across Heterogeneous Networks

C. Cicconetti and G. Stea, University of Pisa, Italy

G. Garcia de Blas, Telefónica I+D, Spain

X. Masip, Technical University of Catalunya, Spain

J. Sá Silva, University of Coimbra, Portugal

G. Santoro, University of Rome "La Sapienza", Italy

H. Tarasiuk, Warsaw University of Technology, Poland

outline
Outline
  • This presentation is about
    • Simulation in the EuQoS project
    • Overview of the EuQoS packet-level simulator
    • Description of the access and core networks
    • Description of the traffic models
    • Preliminary performance evaluation
simulation models
Simulation models
  • Simulation is for validatingand assessing the performance ofthe EuQoS system
  • Two simulators for the EuQoS project
    • Flow Level simulator
      • Flow setup/teardown are the events driving simulation
      • Assess (e.g.) resource reservation and admission control
    • Packet level simulator
      • Packets are transmitted
      • Assess packet-wise measures, e.g. e2e delay and jitter
  • This work describes the packet-level simulator
overview of the packet level simulator
Overview of the Packet Level Simulator

Access networks connected to the core through a single link

No. of flows is fixed

Routing does not change

Traffic distinguished into

Foreground, i.e. applications which are actually measured

Background, i.e. aggregated interference traffic

Hypotheses

access networks
Access networks
  • Four different access networks are considered:

WiFi

UMTS

xDSL

Ethernet

access networks umts
Access Networks: UMTS

Urban and rural scenarios considered

Different propagation and mobility models

Single Node B

Intercell interference accounted for by using interference models

DSCH and DCH implemented

access networks wifi
Access Networks: WiFi

Nodes using DCF in an 802.11 infrastructure mode network (802.11e left for the 2nd phase)

RTS/CTS handshake

Fragmentation

No mobility simulated

Channel error models to be added

No power saving nor rate switching

access networks ethernet
Access Networks: Ethernet
  • Switched Ethernet:
    • Small Office Home Office (SOHO)
    • Campus/LAN scenario
    • MAN organization scenario
    • MAN residential scenario (EPON)
  • 802.1p and 802.1q standards implemented
core network
Core Network

DiffServ-capable routers with (at least) 2 PHBs

QoS-oriented classification, policing and scheduling mechanisms enforced

Interfering traffic represents aggregated traffic from access networks and core domains

Bottlenecks are at the inter-domain links

traffic models
Traffic models

Foreground traffic

VoIP

G.711, G.729 codecs with VAD

Video Conference

MPEG4 and H263 VC traces

Video streaming

MPEG 4 encoded movies

Input expected from application developers in EuQoS

Background traffic

Depends on the network (access tech. and core)

Depends on what applications are actually used

Many models available in the literature

Input expected from measurement activities in EuQoS

implementation of the packet level simulator
Implementation of the packet level simulator
  • Ns-2 has been used
  • Devised a framework that allows the seamless addition of new modules
  • Simulation scenarios can be built incrementally
a simple heterogeneous simulation scenario
A simple heterogeneous simulation scenario
  • First simulations showing the need for e2e QoS
conclusions and future work
Conclusions and future work
  • Conclusions
    • We have designed and developed a flexible simulation system, aimed at verifying e2e QoS on a path of heterogeneous networks
  • Still much to be done…
    • Assess the performance of the solutions that are being (and will be) proposed within the EuQoS project
    • Provide insight on the QoS interoperability across heterogeneous networks
    • Support the development of new algorithms and mechanisms
acknowledgements
Acknowledgements
  • Thanks to all the people involved in the simulation activities within WP2:
    • L. Lenzini, E. Mingozzi, University of Pisa, Italy
    • M. L. García Osma, Telefónica I+D, Spain
    • S. Sánchez, J. Domingo-Pascual, UPC, Spain
    • M. Carmo, University of Coimbra, Portugal
    • A. Angelini, M. Cavicchioni, V. D’Eri, D. Fiorentini, R. Proietti, University of Rome "La Sapienza", Italy
    • R. Janowski, J. Sliwinski, W. Burakowski, D. Duda , WUT, Poland
end of presentation
End of presentation
  • Thanks for listening
  • ?? || //