1 / 17

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

nishan
Download Presentation

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

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. 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

  2. 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

  3. 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

  4. 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

  5. Access networks • Four different access networks are considered: WiFi UMTS xDSL Ethernet

  6. 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

  7. 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

  8. 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

  9. Access Networks: xDSL

  10. 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

  11. 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

  12. 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

  13. A simple heterogeneous simulation scenario • First simulations showing the need for e2e QoS

  14. Evaluation of delay and jitter

  15. 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

  16. 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

  17. End of presentation • Thanks for listening • ?? || //

More Related