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We propose Bluemob, a novel algorithm for building ad-hoc networks among mobile devices of passengers on urban buses using the Bluetooth interface. Based on estimates of node permanence onboard, a role-assignment mechanism establishes the nodes more suited to perform a given function in the network (masters, slaves or gateways). The mechanism is flexible and isolated from the algorithm core, allowing the adoption of Bluemob in other small and dynamic environments and applications with minimal changes. Simulation studies indicate improvements of up to 75 % in the times needed to rebuild the network after nodes have left in comparison to an algorithm without the role-assignment mechanism. Performance levels related to the quality of estimates are also evaluated to indicate the accuracy of estimation needed for proper application of the algorithm.

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