Chemotaxis has been studied as a means to improve communication performancein the promising field of biological nanonetworks. However, as oftoday, no protocols for reliable two-way communications have been proposedin such networks. This work proposes a new protocol for switching betweendifferent chemotactic substances as a novel scheme to improve reliability oftwo-way communications in biological nanonetworks. Multiple simulations,involving message exchange between stations and chemotactic release, wereperformed to evaluate the performance of the proposed strategies and achievea deeper understanding of the behaviour of molecular communicationnanonetworks. Furthermore, a novel message sending strategy utilisingchemorepellent is presented, which does not involve the release of new moleculesinto the medium. Simulating chemotactic substance as individual moleculesallowed for a more accurate modelling of the system in the boundaries ofthe chemotactic interface, bringing out the wave-like behaviour of the latter.The results of the experiments indicate the effectiveness of the proposedcontrolled release strategy in improving message transmission quality.Furthermore, based on the findings of this work, we propose amendments ofexisting protocols that incorporate switching between chemotactic substances.
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