Foundation for Research and Technology–Hellas (FORTH) Institute of Computer Science (ICS)

1. Foundation for Research and Technology–Hellas (FORTH)Institute of Computer Science (ICS) Telecommunications and Networks Laboratory (TNL) Dr. Vasilios A. SirisBroadband and Wireless Networking Activity Leader vsiris@ics.forth.gr http://www.ics.forth.gr/netlab

2. Institute of Computer Science (ICS), FORTH • One of FORTH’s 7 institutes • Established 1983 • Personnel: 247 (2005) • Researchers/Univ. Faculty: 33 • Technical: 106 • Administrative/Support: 19 • Grads/Undergrads: 57/32 • Laboratories • Center for Medical Informatics & Health Telematics • Computer Vision and Robotics • Human Computer Interaction • Information Systems • Computer Architecture & VLSI • Telecommunications & Networks FORTH-ICS

3. Telecommunications & Networks Lab Activities • Telecommunications & Mobile Communications • Trust, cooperation, power efficiency in ad hoc networks • Wireless network security with focus on GSM/UMTS, 802.11 • Broadband and Wireless Networking • Resource management & traffic engineering in wired/wireless networks • Channel and power control in dense WLANs & multi-hop mesh networks • Attack detection and mitigation in broadband networks • Digital Signal Processing • Statistical algorithms for multimedia delivery over wireless networks • Voice processing, synthesis, and compression • Collaborative signal processing for sensor networks • Mobile Computing • Mobile positioning, and location-based services • Mobile network traffic measurement and analysis • Mobile peer-to-peer computing

4. TNL RTD Goals • Explore novel network architectures • Ad-hoc and mesh wireless networks • Sensor networks • Mobile peer-to-peer • Focus on cross-layer design of network protocols • Develop advanced network- and service-level software prototypes • Participate in research excellence & training networks, at National, European, and International level • Serve as a proof-of-concept laboratory for telecommunication systems and software • Promote innovation through RTD transfer and consulting services to industry and government

5. TNL at a glance • Researchers: 5 • Research associates: 1 • Technical personnel: 2 • Research assistants: 17 (6 Ph.D and 11 M.Sc. students) • Journal publications: 20 • Book publications: 3 • Conference publications: 38 • Citations: 441 (101 self sited) • Project funds:1.630K € (05-08: 966K €) • Funds from services: 500K € (05-08 150K €) Growth of personnel During 2000 -2004

6. Traffic Management in Next Generation Wireless/Wired Networks • Efficient traffic management, seamless congestion control, and end-to-end Quality of Service (QoS) support • Importance • Increased access to Internet through wireless networks • Different users/applications demand different quality • Objectives / Expected results • Develop novel models based on cross-layer design for heterogeneous technologies (wired/wireless) • Investigate procedures to control interference, extend coverage, increase spatial reuse, reduce battery consumption • Investigate new architectures: multi-hop, multi-channel, ad-hoc, sensor networks • Investigate QoS support in conjunction with security • Evaluate using analysis, simulation & prototype implementation

7. Design, Management, and Security in Wireless Networks supporting Quality of Service • Integrate technical knowledge and research results to provide state-of-the-art consulting/research services and measurement studies • Importance • Wireless networks is a key technology for providing cost-effective broadband access in rural and densely populated areas • Current design focuses on best-effort services, increased use of Voice-over-IP and streaming video • Security up to now isolated from QoS support • Objectives / Expected results • Develop new techniques for design and management of secure wireless networks • Experiment with new technologies in advanced local and metropolitan area test-beds • Provide high-quality consulting, spectrum measurement services

8. Abstract models for throughput/constraints Map models to mechanisms Wireless technology Research approach & goals Performance & resource sharing objectives

9. TNL Infrastructure • MAC/Network experimentation • Linux/MadWiFi 802.11 MAC parameter control test-bed • Wireless measurement equipment • AirMagnet Laptop Analyzer 2.4/5 GHz and site surveyor • Spectrum analyzers: Rohde&Schwarz FSH-6 (100KHz-6GHz), Spectran 6060 (1MHz-6GHz), low freq. detectors (3Hz-3GHz)

10. MAC parameter control module IEEE 802.11e WLAN test-bed • Cisco 1200 Series Access Point • IOS Version 12.3(4)JA with WMM • SNMP IEEE 802.11 QoS MIB • D-Link DWL-G650 Wireless Cards • Atheros 5211 chipset, MadWiFi • Used by Linux stations • D-Link DWL-AG660 Wireless Cards • Atheros 5212 chipset • Used by Window XP station SNMP STA 1 … STA 11 STA 2 STA 10

11. TNL Infrastructure (cont.) • Science and Technology Park – Crete (STEP-C) Hotspot: serves ~ 1000 users, based on 802.11g/a • Heraklion Wireless MAN: Currently based on 802.11b, >100 Km2 coverage, serving 30 stationary sites. Evolving into multi-hop, multi-channel multi-radio MESH test-bed

12. N W E S Heraklion MESH: Advanced Metropolitan Multi-hop Multi-channel Test-bed • Under deployment • Unique in Greece • 12 nodes (mini PC/Linux) with 2-4 radio interfaces (802.11a/g, future WiMAX) • MadWiFi drivers, OLSR routing • Test-bed for • 802.11e QoS • power control / channel selection • load-based routing ~4.5Km, 11a, 54Mbps ~5Km, 11g, ≥34Mbps FORTH

13. Recent research activities • Resource control for 802.11 WLANs • efficient utilization & throughput differentiation • multi-rate operation, 802.11e EDCA & HCCA modes • coexistence of real-time and elastic traffic • unsaturated traffic conditions • Access point selection • delay-based selection for achieving throughput fairness • SINR and power control in ad hoc networks • tradeoff between SINR threshold and connectivity • Power and channel control for dense WLANs • cell-breathing for load-balancing • consider MAC/network layer performance in target objective

14. State of the Art in Wireless Measurements • Over-provisioning in wired networks is acceptable but in wireless networks can be problematic • Challenges to set a testbed • Complexity in correlating measurements from various tools • Complexity of the radio propagation in real-environments • Academics are reluctant to expend the time and energy to sanitize the data sets • Companies are reluctant to disclose their data • Lack of benchmarks Mobility Activity lead by Prof. Maria Papadopouli (maria@csd.uoc.gr)

15. Research Activities (1/2) • Uncover deficiencies & identify possible optimizations • Using measurements in large-scale production networks • Propose realistic models & benchmarks for network topology, traffic demand, mobility • Design and evaluate protocols for improving the QoS • Emphasis on capacity planning, admission control, buffer management • Employ realistic benchmarks & models in their evaluation

16. FORTH Repository • Online repository of • Wireless measurement data Packet headers, snmp, syslog, signal quality • Models (such as for flow & user arrivals) • Monitoring tools Corresponds to more than 700 APs & 20,000 users http://www.cs.unc.edu/Research/mobile/datatraces.htm Login/ password access after free registration

17. Research Activities (2/2) • Develop principles that enable devices to • Efficient monitoring of networks • Selection of the appropriate channel, network interface • Mobile peer-to-peer computing (mp2p) • Develop various mp2p systems (such as 7DS) • Positioning • Develop & analyze a positioning system (CLS) • Testbed in museums & research park

18. Key Collaborations • Institute for Systems Research - University of Maryland, USA. Prof. Anthony Ephremides • University of North Carolina at Chapel Hill, Prof. Haipeng Shen and Prof. Kevin Jeffay • CNR (National Research Council, IT), Marco Conti • British Telecom (UK). Ongoing funding since 2001 • FORTHnet S.A. Frame Agreement for Research Collaboration

19. Funding EU: • Marie Curie: Excellence Grant • Marie Curie: 2 re-integration grants • COST290: Traffic & QoS Mgmt in Wireless Multimedia Nets National (GSRT): Industrial: • CRETEWISE • Design, Mgmt, Security of Wireless Networks with QoS • Wireless Ad Hoc Networks: security, trust, and routing • Sensor networks for structural health monitoring • 3D audio synthesis • British Telecom: Future Wireless Networks • FORTHnet S.A.: SLA provisioning & monitoring • Intracom: wireless smart cards • GRnet S.A.: QoS mechanism evaluation

20. Foundation for Research and Technology–Hellas (FORTH)Institute of Computer Science (ICS) Telecommunications and Networks Laboratory (TNL) Dr. Vasilios A. SirisBroadband and Wireless Networking Activity Leader vsiris@ics.forth.gr http://www.ics.forth.gr/netlab