Some previous projects

• Mobile and Sensor Computing
  • CarTel, a mobile sensor system motivated by vehicular and transportation applications. CarTel applications can collect, process, deliver, analyze, and visualize data from sensors located on mobile units such as automobiles and smartphones. Component projects include accurate delay estimation (Vtrack and CTrack); the Cabernet content delivery network for vehicles using opportunistic WiFi for connectivity; predictive delay modeling and traffic-aware stochastic routing (soon available on the iPhone as iCartel); various privacy protocols for tolling, insurance, and statistics gathering; the Pothole Patrol road surface monitoring system; etc.
    
  • Cricket, an indoor location system for embedded sensor & mobile context-aware applications. Cricket provides the hardware, software-based algorithms, and a software API for applications to discover their logical location (e.g., which room or portion of a room they are in), position coordinates (e.g., indoor GPS coordinates), and orientation (the Cricket compass). The Cricket design and software are available under open source, and the hardware is available commercially.
  • System software for "truly mobile" devices including:
    • Code In The Air programming model
    • sensor hints to augment wireless protocols
    • reducing energy consumption in LTE and 3G wireless networks
    • mobile privacy (esp. location privacy).
• Network architecture
  • Mosh, the mobile shell, an example of a "first-principles" architecture for interactive remote terminals.
  • Alfalfa, a system for interactive videoconferencing over wireless cellular networks, another example of a gracefully-mobile application (this one is high-bandwidth and low-delay, whereas Mosh is low-delay but not as bandwidth-intensive.
  • Developing elements of Internet architecture using flat names as a fundamental building block. Builds on some lessons learned in Project IRIS. In particular:
    • SFR: Treating data as first-class citizens.
    • DOA: Treating middleboxes as first-class citizens.
  • Robust wide-area Internet routing (e.g., fault detection in routing configuration using the rcc tool, verifying Internet routing, stable Internet routing, rethinking BGP and new routing architectures, router configurations, etc.).
  • Migrate, an session-based architecture for Internet mobility (including suspend/resume) and TCP connection migration.
  • DNS analysis.
  • CM, the Congestion Manager, an integrated end-to-end congestion management architecture for the future Internet. In addition to the architecture, this project developed binomial congestion control, analyzed congestion control under dynamic conditions, investigated congestion state sharing schemes, and developed some new adaptive applications, including OxygenTV (in 2000-01) for wireless MPEG-4 delivery.
  • TESLA, a toolkit for building transparent session-layer services.
• DDoS, spam control, intrusion detection
  • Speak-up: Thwarting application-layer DDoS attacks by taxing bandwidth (see this Sigcomm paper, and this older position paper).
  • DQE, controlling spam using quotas.
  • Real-time anomaly detection.
• Overlay and peer-to-peer networks
  • RON, Resilient Overlay Networks, to improve end-to-end communication availability among a group of cooperating nodes and MONET, Multi-homed Overlay Networks, to improve the end-to-end availability of access to Web sites from Internet clients.
  • Chord, a scalable lookup protocol to implement a distributed hash table (DHT).
  • The IRIS (Infrastructure for Resilient Internet Systems) project advocates the design and deployment of large-scale resilient distributed systems on the Internet using flat names as the fundamental abstraction. The ability to scalably and reliably resolve flat names using DHTs enables IRIS. I've worked on the Chord protocol, analysis of DHTs under node churn (the notion of "half-life" of P2P systems), and DHT-based services such as:
    • SFR (Semantic-Free Referencing), a proposal to untangle the Web from DNS.
    • DOA (Delegation-Oriented Architecture), an extension to the Internet architecture in which senders and receivers direct traffic through intermediaries with a delegation primitive. The goal is to accommodate middleboxes in an architecturally coherent way.
  • Infranet, a system for circumventing Web censorship and surveillance.
  • INS, the Intentional Naming System, in which entities are named by "what" attributes they provide (rather than "where" they are in the network).
• Wireless and sensor networks
  • MRD, a Multi-Radio Diversity system to improve throughput and loss rates in wireless networks.
  • Fusion, a congestion control scheme for wireless sensor networks.
  • Sift, A MAC protocol for event-driven wireless sensor networks.
  • MistLab, a sensornet testbed. Now open for public use and experimentation.
  • BSD, Bounded SlowDown protocol for minimizing energy for Web access on wireless (Wi-Fi) clients.
  • Span, an energy-efficient topology formation protocol for ad hoc networks.
  • LEACH and SPIN, energy-efficient clustering and information dissemination protocols for wireless sensornets.
  • HeaderCompress, a tool that automatically generates header compression code from high-level specs.
  • Blueware, protocols for internetworking with Bluetooth.
  • Wireless TCP improvements and TCP over asymmetric networks. Software (unmaintained and unsupported).
• Data management systems
  • CryptDB, a system to run SQL over fully encrypted data without requiring clients to perform any query processing themselves.
  • HRDB, a Heterogeneous Replicated Data Base system that provides high availability by replicating different implementations of a SQL DBMS (e.g., Postgres, MySQL, Oracle, and DB2 could form the replicas). (No modifications to these replicas is required.)
  • Medusa, a large-scale distributed streaming database system that provides a stream processing framework for sensor data streams, and its follow-on project, Borealis.