Energy Efficient Dynamic Slot Allocation Scheme for Wireless Sensor Networks
In this paper, we propose an energy-efficient slot allocation scheme for Time Division Multiple Access (TDMA) based Wireless Sensor Networks (WSNs). Due to battery constraints, energy efficiency is one of the most important factors in operating WSNs. TDMA is preferred in WSNs because it helps avoid data collision and provides predictable latency. In other words, it is energy efficient because no retransmission due to data collision is required. However, TDMA has the disadvantage of wasting assigned time slots when there is no data to transmit. Therefore, there is a need for a dynamic TDMA, which assigns timeslots only to nodes with data to transmit. Compared with static TDMA, dynamic TDMA should perform more frequent slot allocation. Therefore, the energy consumption for slot allocation should be low. In the proposed scheme, only nodes with data to be transmitted can obtain a time slot in a competitive way while considering energy efficiency. We evaluate and compare the proposed scheme with the LOCALL algorithm in terms of energy consumption for slot allocation using intensive simulations.
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