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This paper presents a resource-efficient protocol for opportunistic routing in Delay-Tolerant Networks (DTN). First, the authors' approach exploits the context of mobile nodes (speed, direction of movement and radio range) to estimate the size of a contact window. This knowledge is exploited to make better forwarding decisions and to minimize the probability of partially transmitted messages. Optimizing the use of bandwidth during overloads helps reduce energy consumption since partially transmitted messages are useless and waste transmission power. Second, they use a differentiation mechanism based on message utility.
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