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 Acronym Experimental Computer ECSL Systems Lab Wireless Networking and WINGS Simulation Lab Media Networking Lab 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.