Foundation for Research and Technology

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Foundation for Research and TechnologyHellas
(FORTH)Institute of Computer Science (ICS)
Telecommunications and Networks Laboratory (TNL)
Dr. Vasilios A. SirisBroadband and Wireless
Networking Activity Leader vsiris_at_ics.forth.gr htt
p//www.ics.forth.gr/netlab
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Institute of Computer Science (ICS), FORTH

• One of FORTHs 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
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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

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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

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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 funds1.630K (05-08 966K )
• Funds from services 500K (05-08 150K )

Growth of personnel
During 2000 -2004
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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

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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

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Research approach goals
Performance resource sharing objectives
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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 RohdeSchwarz FSH-6
  (100KHz-6GHz), Spectran 6060 (1MHz-6GHz), low
  freq. detectors (3Hz-3GHz)

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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
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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, gt100 Km2 coverage, serving 30 stationary
  sites. Evolving into multi-hop, multi-channel
  multi-radio MESH test-bed

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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
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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

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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_at_csd.uoc.gr)
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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

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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.h
  tm
• ? Login/ password access after free registration

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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

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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

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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

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Foundation for Research and TechnologyHellas
(FORTH)Institute of Computer Science (ICS)
Telecommunications and Networks Laboratory (TNL)
Dr. Vasilios A. SirisBroadband and Wireless
Networking Activity Leader vsiris_at_ics.forth.gr htt
p//www.ics.forth.gr/netlab