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Faculty and Labs
Lab Name Acronym
Experimental Computer Systems Lab
ECSL
Wireless Networking and Simulation Lab
WINGS
Media Networking Lab MNL
• Faculty: Hussein Badr, Tzi-cker Chiueh, Samir Das, Jie Gao, Himanshu Gupta, Alex Mohr, Jennifer Wong.
Focus Areas
• Wireless LAN
• Wireless Ad Hoc and Mesh Networks
• Wireless Sensor Networks
• Media Networking
• Peer-to-peer Networking
Focus Areas
• Wireless LAN
• Wireless Ad Hoc and Mesh Networks
• Wireless Sensor Networks
• Media Networking
• Peer-to-peer Networking
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.