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Master's Thesis

Evaluation of Simple Fragment Forward Recovery for the 6LoWPAN Protocol

To realize the vision of the Internet of Things, various efforts are undertaken to bring the internet protocol even to the most resource-constrained devices such as wireless sensor nodes. One important building block is the 6LoWPAN protocol which enables transmission of IPv6 datagrams via link layers such as the 802.15.4 protocol. Although 6LoWPAN has reached RFC status in the meantime, there exist some unsolved questions, especially concerning fragmentation, which has to be used to send large IPv6 datagrams over link layers with small MTUs (e.g. 802.15.4 with 127 bytes). Sending a large number of fragments over multiple hops of an unreliable channel exhibits an increasing probability to lose a fragment and thereby the whole datagram. Additionally, this may lead to situations, where consecutive fragments are still transmitted uselessly by nodes farther away from the occasion of the datagram loss.

To overcome such problems, an addition to the 6LoWPAN RFC describes a mechanism for Simple Fragment Forward Recovery (SFFR). This mechanism uses acknowledgements to add end-to-end reliability to the frag- mented transmission of datagrams, both for mesh-under and direct route-over routing schemes. Within this Diplomarbeit or Master’s Thesis, this mechanism has to be implemented for the existing CometOS 6LoWPAN stack and evaluated against the standard stack without such a mechanism using different modes (Assembly, Direct).

Start date 15. April 2014
End date 31. October 2014
Documents Flyer
Projects CometOS | SensorNet
Supervisor Dr-Ing. Andreas Weigel