Abstract
Wireless Sensor Networks (WSN) are enabler technologies for the implementation of the Internet of Things (IoT) concept. WSNs provide an adequate infrastructure for the last-link communication with smart objects. Nevertheless, the wireless communication medium being inherently unreliable, there is the need to increase its communication reliability. Techniques based on the use of cooperative communication concepts are one of the ways to achieve this target. Within cooperative communication techniques, nodes selected as relays transmit not only their own data, but also cooperate by retransmitting data from other nodes. A fundamental step to improve the communication reliability of WSNs is related to the use of efficient relay selection techniques. This paper proposes a relay selection technique based on multiple criteria to select the smallest number of relay nodes and, at the same time, to ensure an adequate operation of the network. Additionally, two relay updating schemes are also investigated, defining periodic and adaptive updating policies. The simulation results show that both proposed schemes, named Periodic Relay Selection and Adaptive Relay Selection, significantly improve the communication reliability of the network, when compared to other state-of-the-art relay selection schemes.
Highlights
One of the most pursued goals in today’s computing environments is the ability to run and access computing data, anywhere, anytime
When compared to other techniques, the main scientific contribution of the proposed technique is the selection of a set of relay nodes being based on multiple criteria, namely: the number of neighbors of the candidate node, their remaining battery energy, the quality of the communication link between the candidate node and its neighbor nodes and the success rate’s history in recent node transmissions, which provides the adequate selection of relay nodes and improve the communication reliability, since these criteria are critical for the operation of the network
To overcome some of the disadvantages highlighted by this state-of-the-art analysis, the technique proposed in this paper considers multiple criteria as parameters for the relay selection
Summary
One of the most pursued goals in today’s computing environments is the ability to run and access computing data, anywhere, anytime. When compared to other techniques, the main scientific contribution of the proposed technique is the selection of a set of relay nodes being based on multiple criteria, namely: the number of neighbors of the candidate node, their remaining battery energy, the quality of the communication link between the candidate node and its neighbor nodes (by using the RSSI) and the success rate’s history in recent node transmissions, which provides the adequate selection of relay nodes and improve the communication reliability, since these criteria are critical for the operation of the network.
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