Transcript Networking Research - Stony Brook University

Networking Research
in
Stony Brook
University
Faculty and Labs
• Faculty: Hussein Badr, Tzi-cker Chiueh,
Samir Das, Jie Gao, Himanshu Gupta,
Alex Mohr, Jennifer Wong.
Lab Name
Experimental Computer
Systems Lab
Wireless Networking and
Simulation Lab
Media Networking Lab
Acronym
ECSL
WINGS
MNL
Focus Areas
• Wireless LAN
• Wireless Ad Hoc and Mesh
Networks
• Wireless Sensor Networks
• Media Networking
• Peer-to-peer Networking
Ad Hoc / Mesh Network
Wireless
router
Mobile
host
Ad Hoc / Mesh Network
Mobile wireless
router/host
Focus Areas
• Wireless LAN
• Wireless Ad Hoc and Mesh
Networks
• Wireless Sensor Networks
• Media Networking
• Peer-to-peer Networking
Sensor Network
Focus Areas
• Wireless LAN
• Wireless Ad Hoc and Mesh
Networks
• Wireless Sensor Networks
• Media Networking
• Peer-to-peer Networking
Wireless Interference Modeling
(Das)
• Model wireless interference in an actual
deployed network.
• Model network capacity based on
measurements.
• Useful for many goals:
– Routing
– Channel assignment
– Admission control for VoIP
Protocols and Algorithms for
Using Multiple Channels and
Directional Antenna
(Das and Gupta)
• Use of multiple channels and directional
antennas improve wireless network
capacity.
• Many directions: from MAC protocols to
topology control algorithms with
provable properties..
• Integration with routing.
RFID Sensor Networks
(Das and Gupta)
• Augment a sensor network with RFID
readers acting as sensors.
• Efficient channel access with multiple
RFID readers.
• Applications: activity recognition,
assisting blind people.
Carlsbad: Indoor Wireless Sensor
Network Platform (Chiueh)
• Exploit commodity IEEE 802.11b WLAN access points
(Linksys WRT54G, < $30) as building blocks for indoor
wireless sensor network (WSN) applications
• Use SNMP as the basic interaction protocol among
wireless sensor network nodes
• Provide a SQL interface and distributed query
processing system to sensor data stored on WSN
nodes
• Support dynamic channel switching to minimize
impacts of Carlsbad on enterprise LANs
• First application: enterprise WLAN traffic and security
monitoring, including spoof detection
Voice over IP on IEEE802.11-based
Wireless Mesh Network (Chiueh)
• Challenges:
– Quality of service guarantee
– Per-packet overhead
• Solution:
– A software-only MAC based on TDMA
– Disable link-layer ACK, shrink contention window
to zero and batching of downstream packet
• Result: allows a single IEEE 802.11b channel to
support more than 50 two-way G.729 VoIP
connections: < 10 in commercial VoWLAN products
MiNT: Miniaturized High-Fidelity
Wireless Test-bed (Chiueh)
• Use radio signal attenuation to reduce physical space
requirement
• Wireless network node on Roomba robot
• Vision-based robot motion control
• Self-charging for 24x7 unmanned operation
• Allow ns-2 code to run on MiNT without change
• Support re-configurable initial multi-hop network
topology and run-time mobility during simulation
• Next step: comprehensive wireless network
simulations on MiNT testbed
Topology Discovery in Sensor
Networks (Gao)
• Given a network of sensor nodes deployed in
an unknown region without location
information, discover the boundary nodes.
Joint work with Yue Wang, Joe Mitchell, to appear in Mobicom’06.
Routing Around Holes (Gao)
• Load balancing
• Do not overload
nodes on the
boundary.
• “Traffic road
system”.
Joint work with Shuki Bruck, Anxiao Jiang, Mobicom’05.