Abstract
Wireless sensors network (WSN) is widely used in the Internet of Things at present. However, limited energy source is a critical problem in the improvement and practical applications of WSN, so it is necessary to improve the energy efficiency. As another important evaluation criterion of transmission performance, throughput should be improved too. To mitigate both of the problems at the same time, by taking the advantages of Time Division Multiple Access (TDMA) and Carrier Sense Multiple Access (CSMA) at the medium access control (MAC) layer of WSN, we propose a hybrid TDMA/CSMA MAC layer protocol. Meanwhile, we design a novel power control scheme to further reduce the energy consumption and optimize the transmission slots. The simulation results demonstrate that the proposed protocol significantly improves the throughput and energy efficiency.
Highlights
Wireless sensors network (WSN) suffers from energy efficiency problem in many applications
We propose a Time Division Multiple Access (TDMA)/Carrier Sense Multiple Access (CSMA) hybrid medium access control (MAC) layer protocol (TCH-MAC) to enhance the energy efficiency of WSN
We take the protocols Energy-FDM [8], CEE [11], and Z-MAC [5] for comparison, because they are all aiming at energy efficiency and throughput improvement for wireless networks
Summary
Wireless sensors network (WSN) suffers from energy efficiency problem in many applications. A TDMA-based protocol is described in [7] to decrease energy consumption in WSN, but it has a negative influence on the transmission performance as the throughput. Another MAC layer protocol named Energy-FDM is proposed based on CSMA in [8]; it reduces energy consumption by transmission power control, but it leads to a high collision rate, especially in high traffic networks. OPWUM [10] makes efforts on receivers with leveraging wake-up hybrid scheme and reduces energy consumption effectively, but the frame structure design is complicated and leads to a waste of resources, so it has a negative influence on transmission performance.
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