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Johannes Kampmeyer, "Simulation von Firmwareupdates in drahtlosen Ad-Hoc-Netzwerken am Beispiel Freifunk Paderborn / B.A.T.M.A.N.," Bachelor Thesis, Department of Computer Science, University of Paderborn, August 2015. (Advisors: Maximilian Wilhelm and Falko Dressler)


Firmware updates in Mobile Ad Hoc Networks focus on efficient use of resources such as low power consumption or minimizing network usage. This thesis will focus on firmware updates that break compatibility on the network layer. When an update introduces a new incompatible version of the underlying routing algorithm, it can destroy the mesh. This is the case in the Freifunk network of Paderborn. Using the Freifunk network as an example, the particular characteristics, that are special to these networks in comparsion to traditional Mobile Ad Hoc Networks, will be explained. After describing the implementation details for the simulation, two different solu- tions to mitigate this problem will be presented. The first one utilizes the wireless neighborhood of a node to synchronize when updates are going to take place. The second one uses the Freifunk client network of each node as a fallback mechanism that will provide a connection to the update server. These solutions are also com- bined to evaluate if they work together and can improve the solution, to minimize the downtimes of each node. Using the network simulation tool OMNeT++1 the developed strategies will be simulated and compared. The results of the simulation showed definite improvements when the developed strategies were used. There were drawbacks as well, when both strategies were used together. The fallback mechanism would interfere with the synchronization and could destroy the update schedule. With an intelligent fallback mechanism the combination of the two strategies may present a better solution in the future.

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Johannes Kampmeyer

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    author = {Kampmeyer, Johannes},
    advisor = {Wilhelm, Maximilian and Dressler, Falko},
    title = {{Simulation von Firmwareupdates in drahtlosen Ad-Hoc-Netzwerken am Beispiel Freifunk Paderborn / B.A.T.M.A.N.}},
    institution = {Department of Computer Science},
    year = {2015},
    month = {August},
    school = {University of Paderborn},
    type = {Bachelor Thesis},

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