IEEE Transactions on Wireless Communications
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Due to limited radio transmission range, sporadic node densities and power limitations, mobile ad hoc networks (MANETs) can usually become intermittently connected, thereby data routing process is disrupted in the absence of an end-to-end routing path. To this effect, various ‘store-carry-forward (SCF)’ routing algorithms have been proposed in the literature that exploit the mobility and storage space of the nodes to deliver messages even if a route never exists. To have a high probability of eventual delivery, flooding-based or multi-copy-based forwarding strategy is adopted by majority of these schemes. Furthermore, in the human-related environments containing correlated movements, performance is quantified in terms of the probability of the message delivery between any pair of nodes. However, in the multi-copy case, the conventional individual delivery probability alone fails to address delivery opportunity from other nodes that also carry the same message copies. With this in mind, this paper presents several routing-related key parameters and accordingly introduces a fuzzy logic-based delivery framework (FLDF) to select and store messages that have higher delivery preference in the future. In the proposed mechanism, FL, which has the fundamental ability to deal with imprecise or uncertain information caused by intermittent connectivity as well as mobility randomness, is employed to handle the message evaluation and selection. Simulation results demonstrate the enhanced delivery performance offered by the proposed FLDF compared with the existing schemes. Copyright © 2008 John Wiley & Sons, Ltd. A short version of this work was presented at International Wireless Communications and Mobile Computing Conference (IWCMC2008), 6-8 August 2008, Greece.