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ABSTRACT
This paper explores the impact of node mobility on DMAC, a typical clustering protocol for mobile ad hoc networks. Several protocols for clustering have been proposed, which are quite similar in operations and performance. We selected one and evaluate the cost of maintaining the clustering structures when the nodes move according to three different mobility models, namely, the random way point model, the Brownian motion and the Manhattan mobility model. Via ns2-based simulations we have observed that the mobility models have different impact on protocol performance. The general trend, however, appears to be the same for networks of increasing size. The second contribution of this paper concerns mitigating the impact of mobility over the clustering structure and hence on the overall network performance. We consider a generalization of DMAC (GDMAC) where rules are established to decrease the number of cluster updates. Via simulation we have observed that GDMAC is effective in reducing the clustering overhead imposed by mobility, and hence its maintenance cost.
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