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Abstract
Collision-free transmission and efficient data transfer between nodes can be achieved through a set of channels in multichannel wireless sensor networks (MWSNs). While using multiple channels, we have to carefully consider channel interference, channel and time slot (resources) optimization, channel switching delay, and energy consumption. Since sensor nodes operate on low battery power, the energy consumed in channel switching becomes an important challenge. In this paper, we propose channel and time slot scheduling for minimal channel switching in MWSNs, while achieving efficient and collision-free transmission between nodes. The proposed scheme constructs a duty-cycled tree while reducing the amount of channel switching. As a next step, collision-free time slots are assigned to every node based on the minimal data collection delay. The experimental results demonstrate that the validity of our scheme reduces the amount of channel switching by 17.5%, reduces energy consumption for channel switching by 28%, and reduces the schedule length by 46%, as compared to the existing schemes.
Highlights
Recent advances in wireless sensor networks (WSNs) have enabled the development of low-cost and low-power devices that are smaller in size and have longer coverage distances
Due to the increase in the amount of simultaneously-transmitted data, the data collection rate can be improved in multichannel wireless sensor networks (MWSNs)
Existing MWSN studies allocate different channels to all receiving nodes to prevent conflicts between channels, but time slot assignment is not taken into account
Summary
Recent advances in wireless sensor networks (WSNs) have enabled the development of low-cost and low-power devices that are smaller in size and have longer coverage distances. Existing MWSN studies allocate different channels to all receiving nodes to prevent conflicts between channels, but time slot assignment is not taken into account. In MWSNs, different channels and time slots can be used to complement each other in providing a collision-free schedule This can be solved with different time slot assignments, since it does not require allocating multiple channels. The rest of the paper is structured in the following manner: Section 2 describes related studies; Section 3 defines problems with the network model, and assumptions are discussed; the proposed scheme for channel and time slot assignment in a multichannel wireless sensor network is thoroughly explained in Section 4; Section 5 presents the simulation environment and performance evaluation of the proposed scheme; and, Section 6 concludes the work
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