Slide 1 © EuQoS consortium IPS MoMe, Warsaw, March 2005 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

Slide 2 © EuQoS consortium IPS MoMe, Warsaw, March 2005 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

Slide 3 © EuQoS consortium IPS MoMe, Warsaw, March 2005 Simulation models Simulation is for validating and assessing the performance of the 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

Slide 4 © EuQoS consortium IPS MoMe, Warsaw, March 2005 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

Slide 5 © EuQoS consortium IPS MoMe, Warsaw, March 2005 Access networks Four different access networks are considered: UMTS xDSL WiFi Ethernet

Slide 6 © EuQoS consortium IPS MoMe, Warsaw, March 2005 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

Slide 7 © EuQoS consortium IPS MoMe, Warsaw, March 2005 Access Networks: WiFi Nodes using DCF in an infrastructure mode network (802.11e left for the 2 nd phase) RTS/CTS handshake Fragmentation No mobility simulated Channel error models to be added No power saving nor rate switching

Slide 8 © EuQoS consortium IPS MoMe, Warsaw, March 2005 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

Slide 9 © EuQoS consortium IPS MoMe, Warsaw, March 2005 Access Networks: xDSL

Slide 10 © EuQoS consortium IPS MoMe, Warsaw, March 2005 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

Slide 11 © EuQoS consortium IPS MoMe, Warsaw, March 2005 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

Slide 12 © EuQoS consortium IPS MoMe, Warsaw, March 2005 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

Slide 13 © EuQoS consortium IPS MoMe, Warsaw, March 2005 A simple heterogeneous simulation scenario First simulations showing the need for e2e QoS Traffic typeEthernetCoreWiFi Hi-priPremium Same treatment Lo-priBest Effort

Slide 14 © EuQoS consortium IPS MoMe, Warsaw, March 2005 Evaluation of delay and jitter Add background traffic at… EthernetCoreWiFi t=20st=40st=60s

Slide 15 © EuQoS consortium IPS MoMe, Warsaw, March 2005 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

Slide 16 © EuQoS consortium IPS MoMe, Warsaw, March 2005 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

Slide 17 © EuQoS consortium IPS MoMe, Warsaw, March 2005 End of presentation Thanks for listening ?? || //