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The authors consider wireless sensor networks where a number of unconstrained nodes (Access Points) with unlimited power source can be deployed together with constrained and limited energy sensor nodes. The presence of unconstrained nodes promotes the use of centralized TDMA scheduling mechanisms that can potentially reduce the delay and save power by eliminating collisions. In this paper they propose two scheduling schemes: interleaved and non-interleaved scheduling, that allocate time slots to nodes in a spatial way to enable the follow of data from sensors to the access point (sink).
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