Interplanetary Internet
(Seminar 2 SWS)

Instructor: Prof. Jens-Peter Redlich
Thursday, 13:15 - 14:45, RUD 25, Room 4.112

Computer Science Department
Systems Architecture Group

IMPORTANT: This is a draft. The final document may differ significantly from the current version.

Abstract: Increasingly, network applications must communicate with counterparts across disparate networking environments characterized by significantly different physical and operational constraints than what we find in today's Internet. In general, these environments share a common inability to establish and maintain a low-loss, low-latency, end-to-end communication session. Yet, it is precisely the ability to maintain such a session that is required by most existing Internet-style protocols. We will study the fundamental principles that underlie a delay-tolerant networking (DTN) architecture, that is suitable for the future Interplanetary Internet (as an extreme case) but also for "extreme situation networks" on planet earth (e.g. in developing regions with limited power and telecommunication infrastructure, or, in natural disaster areas).


  • Seminar, Praktische Informatik, Hauptstudium.
  • 2h each week, over one semester (2 SWS).
  • Target Audience: Students who are interested in "Challenged Internetworks" - Which (try to) apply Internet technology for inter-planetary communication and also in disparate environments on earth.

How the seminar will be conducted:

This is experimental; if it does not work, we'll switch back to the traditional model (see last semester's seminar on "peer-to-peer networks").

In addition to the technical (computer science) matter, it is the goal of this seminar that you learn to speak in front of an audience, learn to convey ideas effectively, learn to accept feedback from the audience and use it to improve your work (here: your presentation). The purpose of the "elevator presentation" is to (try to) express a great idea in a very short time - a skill that is certainly useful in your future professional life (it also gives your fellow student's an idea what's to come).

  • Topics will be firmly assigned to interested students during the first meeting (April 20th)
  • No meeting in 2nd week - you will be busy with homework :-)
  • During the next two meetings, every student (presenter) gives a 15 minutes elevator presentation (summary preview) of his/her topic. The audience will provide feedback regarding style and content.
  • In the following 8 weeks we'll have presentations; 1 or 2 peer meeting. Presentations will be evaluated by two members of the audience at the end of each class (Bewertungskriterien-Seminarvortrag.pdf).
  • Presentations may be given in English or in German. All documents are in English (exceptions may be granted). A PowerPoint template can be obtained here .
  • Presenters summarize their presentation and relevant discussion on the Seminar's WIKI page within 2 weeks.
  • To obtain credits for this seminar, you are expected to attend regularily.


  • Successful completion of PI-1,2,3.
  • Completion of at least one seminar/lecture/project-seminar in the general area of "Communication Networks" (e.g., lectures offered by Dr. Sommer, Prof. Redlich).
  • Advanced knowledge of the protocols IP (addressing, Internet Routing), and TCP (window-based congestion control). Basic knowledge of ad-hoc wireless mesh-networks.


  1. Interplanetary Internet - Introduction / State of the Art / Architecture Overview
  2. Interplanetary Transport Protocols
  3. DTN as a generalized messaging service
  4. DTN Architecture Overview
  5. DTN Routing (1): Epidemic Routing / Controlled Flooding
  6. DTN Routing (2): Probabilistic / Un-Planned / Unknown Connectivity Patterns
  7. DTN Routing (3): Planned / Scheduled / Known Connectivity Patterns
  8. DTN Multicasting
  9. Network Coding for Efficient Communication
  10. Data Retrieval in Intermittedly Connected Networks
  11. Self-Organization Principles
  12. Localization Services
  13. Under-Sea Communication
  14. Tetra, Tetrapol
  15. Security in DTN

Assignments (Themenvergabe):




 20.Apr Jens-Peter Redlich Introduction pdf

no meeting

 No Class - You'll prepare your elevator presentations 
 04.May Nordhausen, Nagel (2)
 Möbius, Altschudjian (5)
 Holzhauer, Cremerius (6)
 1st half of elevator presentations 
 11.May Beier, Neukirchen (10)
 Kunze, Otto (9)
 Semmler, Keller (12)
 Herkt, Kühn (15)
 2nd half of elevator presentations 
 18.May Nordhausen, Nagel 2: Interplanetary Transport Protocols  pdf

Himmelfahrt (National Holiday)

 01.Jun Möbius, Altschudjian 5: DTN Routing (1): Epidemic Routing / Controlled Flooding 
 08.Jun Holzhauer, Cremerius 6: DTN Routing (2): Probabilistic / Un-Planned / Unknown Connectivity Patterns 
 15.Jun Carstensen Regelmässige Bewegungsmuster  pdf
 22.Jun Beier, Neukirchen  10: Data Retrieval in Intermittedly Connected Networks  pdf
 29.Jun Kunze, Otto 9: Network Coding for Efficient Communication 
 06.Jul Maria Tsitiridou 8: DTN-Multicasting  pdf
 13.Jul Herkt, Kühn 15: Security in DTN 
 20.Julno meeting

 no meeting



 DTN...(1) Delay Tolerant Network
(2) Disruption Tolerant Network
 IPNI...InterPlaNetary Internet
 ICN...Intermittently Connected Network
 LEO ...Low Earth Orbit (satellite)
 FEC Forward Error Correction
Interplanetary Internet Project
Delay-Tolerant Networking Group
Georgia Tech
Broadband & Wireless Networking Lab

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