Delay Tolerant NetworkAhmed Osama

DTN- WINC- Nile University 2

Delay Tolerant NetworkWhat is Delay Tolerant Network?

Introduction Challenges Summary

S D

No continuous route exist between the source and destination

DTN- WINC- Nile University 3

Delay Tolerant NetworkWhat is Delay Tolerant Network?

Introduction Challenges Summary

S D

Use opportunistic routing to deliver packets (Mobility case)

I

DTN- WINC- Nile University 4

Delay Tolerant NetworkWhat is Delay Tolerant Network?

Introduction Challenges Summary

S D

Use opportunistic routing to deliver packets (Scheduled wake up)

II

I

DTN- WINC- Nile University 5

Delay Tolerant NetworkWhat is meant by extreme environment?

Introduction Challenges Summary

Deep Space CommunicationsBeyond near-earthLanders, Orbiters, Deep Space Probes

Sensor NetworksTerrestrial: Ocean or Land BasedExtra-terrestrial objects (on planets, etc)

High-Stress Physical EnvironmentsBattlefield, Civil Emergency, Submarines

DTN- WINC- Nile University 6

Delay Tolerant NetworkChallenges that concern us

1. Reliability2. Security 3. Evolving files and caching

Introduction Challenges Summary

DTN- WINC- Nile University 7

ReliabilityNetwork Coding in delay tolerant network

In delay tolerant network; realistic network environment suffers from limited bandwidth and node buffers.

In such environment, we need to deliver packets with minimal delivery delay under no precise knowledge, with taking into account limited buffer length

Introduction Challenges Summary

DTN- WINC- Nile University 8

Evolving files and cachingIn a cooperative environment and non cooperative

The need to send an updated version of file to N nodes to be stored; these nodes are mobilesSo we need to examine different ways in distributing files which change dynamically. “In Delay tolerant Network”Generic Examples

File change from time to time(weather forecasting)Backup filesSoftware update patches

Introduction Challenges Summary

DTN- WINC- Nile University 9

Security I am very concerned with Traffic analysis

1. Because traffic analysis is dangerous, why?2. Naïve solution (L2L encryption) will introduce a

huge overhead in addition to its failure if an intermediate nodes were compromised.

Introduction Challenges Summary

DTN- WINC- Nile University 10

SummaryTo sum up

1. Delay tolerant network coding is a network where no continuous path exist between source and destination

2. Delay tolerant network coding is used in extreme networks

Introduction Challenges Summary

DTN- WINC- Nile University 11

References

Web Resourcesen.wikipedia.org/wiki/Delay-tolerant_networkingwww.dtnrg.org/www.ipnsig.org/PapersE. Altman, P. Nain, and J. Bermond. Distributed storage management of evolving files in delay tolerant ad hoc networks. In Proc. of IEEE INFOCOM, 2009.Y. Fan, Y. Jiang, H. Zhu, and X. Shen, "An Efficient Privacy-Preserving Scheme against Traffic Analysis Attacks in Network Coding", Proc. IEEE INFOCOM'09, Rio de Janeiro, Brazil, April 19-25, 2009.Y. Lin, B. Liang, and B. Li, “Performance Modeling of Network Coding in Epidemic Routing,” in Proc. of the First ACM International Workshop on Mobile Opportunistic Networking (MobiOpp), 2007.

Any Questions?Thank you for listening