Dr. Jason Redi

email: my last name at bbn.com

Network Technologies Business Unit
BBN Technologies
10 Moulton St., Cambridge, MA, 02138
Tel: +1 617-873-4236 ; Fax: +1 617-873-2092

(This page last updated on Nov 29th, 2007)

I'm a Principal Scientist in the Network Technologies Business Unit of BBN Technologies. This group of about 100 people works on the design, implementation and fielding of of ad hoc wireless networks (aka packet radio).

Current Projects

  • Policy-based Infromation centric Reliable Ad hoc Network (PIRANA), part of the Wireless Network After Next Program, sponsored by DARPA-STO, Principal Investigator.

    DARPA WAND (known internally as PIRANA) is developing scalable, adaptive, ad hoc networks which exploit very inexpensive, yet flexible software radios. Innovative aspects of the program include the incorporation of DTN technology for disconnected operation, dynamic spectrum access for finding and exploiting any available frequencies rather than using pre-allocated frequencies, exploitation of multichannel MIMO, and the use of policy and reasoning techniques to make the right tradeoffs and adaptations for the particular mission. This program will require new ideas and innovations to combine previously isolated technologies in new and synergistic ways. We are working towards a 40 radio demonstration in Dec 2008, a 100 radio demonstration in Dec 2009, and a 1000 radio demonstration in Dec 2010.

  • Joint Architecture Vision for Low Energy Networking (JAVeLEN), part of the Connectionless Networking Program, sponsored by DARPA-STO, Principal Investigator.

    The goal of this program is to reduce the energy-per-bit used for delivering information in a wireless ad hoc network by 100 times, while still delivering the delay and throughput capabilities of traditional wireless multihop networks. The BBN Technologies team proposed and designed a set of interoperating networking and radio components which provide a fresh rethinking of network protocols and their interactions from the transport layers down to the radio modem. Particular innovations from our work include: dynamic slot synchronization that maintains tight slotting without external signals such as GPS, innovative use of correlators within the modems to provide signals without dedicated sync and acquisition bits; pseudo-random transmit and receive sequences for compact and flexible expression of radio cycles; and caching and cross-layer acknowledgement techniques to reduce the energy cost to maintain end to end delivery. In Phase 1 of the program we provided simulation and theoretical results across a variety of situations to show that our low-energy design scaled across network size, traffic, and density. In Phase 2 of the program we took one year to build working prototypes of our designs and demonstrate them in a 20 node network. These prototypes included custom military radio transcievers, a software radio modem, and network and transport protocols built from scratch. Our demonstration showed 100X reduction in energy while maintaining 1Mbps network wide throughput. We are now in phase 3 where we are finalizing the adaptation methods of the protocols and manufacturing final objective boards into a fieldable productized package.

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