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Data collection is one of the most important functions provided by wireless sensor networks. In this paper, the authors study the theoretical limitations of data collection and data aggregation in terms of delay and capacity for a wireless sensor network where n sensors are randomly deployed. They consider two different communication scenarios (with or without aggregation) under physical interference model. For each scenario, they first propose a new collection method and analyze its performance in terms of delay and capacity, then theoretically prove that their method can achieve the optimal order.
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