Correia, F.Vazao, T.Lobo, V. J.Eltoweissy, M.Wakamiya, N.Lorenz, P.Freire, M. M.2009-01-01978-1-4244-5085-5http://hdl.handle.net/10362/7127On a mobile ad-hoc network environment, where the resources are scarce, the knowledge about the network's link state is essential to optimize the routing procedures. This paper presents a study about different pheromone evaluation models and how they react to possible changes in traffic rate. Observing how the pheromone value on a link changes, it could be possible to identify certain patterns which can indicate the path status. For this study, the behavior of the Ant System evaluation model was compared with a Temporal Active Pheromone model (a biological approach) and a Progressive Pheromone Reduction model with and without a maximum pheromone limit.engbook part2014-12-09