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In this paper, optimal scheduling mechanisms are developed for packet forwarding in wireless sensor networks, where clusterheads are gathering information. The objective is to monitor real-life processes for a given time interval and forward packets with minimum loss probabilities to the base station. In order to achieve this objective the authors develop an optimal scheduling algorithm, which determines the time slots in which packets must be sent by the nodes. The scheduling algorithm, on the one hand, guarantees that all the packets will be sent within a predefined time window and thus meeting delay constraints and, on the other hand, it provides uniform packet loss probabilities for all the nodes.
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