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Wednesday, April 18
12:10 p.m.
ISAT/CS 259

The Computer Science Department invites you to attend the upcoming Speaker Series presentation by Keith Scott of MITRE Corporation on Wednesday, April 18 at 12:10 in the ISAT/CS 259.

Dr. Scott will be discussing the Delay / Disruption Tolerant Networking (DTN) architecture and protocols that form the basis of the Solar System Internet and that are currently being standardized in the Internet Engineering Task Force (IETF) for terrestrial applications. While the Internet Protocol Suite (IPS) was originally designed to operate in austere wireless environments including satellite communications, it has grown to depend on stable connectivity, low delay, and low error rate links. DTN was first proposed in the late 1990s as a way of standardizing the relay communications used to return data from rovers on the surface of Mars (and which still return over 90% of data from the rover). DTN differs from IP in that DTN 'routers' may hold on to data for extended periods of time before forwarding them -- for instance if an orbiter obtains data from a rover but can't immediately forward it to Earth. DTN has since been deployed as an experimental capability on a number of space missions and is currently operational for payload communications on the International Space Station.

While DTN has been under development for nearly 20 years, significant research challenges still remain. For example, a number of routing strategies have been developed for scheduled and ad-hoc networks, but scalability, multicast, and mechanisms to provide both efficient and reliable delivery in non-scheduled networks remain issues.

Refreshments will be provided courtesy of the Computer Science Department.

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