Four-cycles Delay-Efficient RPL-based Routing approach For IoT applications

In wireless sensor networks (WSNs), the Routing Protocol for Low power and Lossy Networks (RPL) is praised as one of the most widely used routing protocols. In RPL, the Network is divided into a group of subgraphs. The best path can be computed by using an objective function and set of metrics. This paper proposes an enhancement for RPL by using four different cycle times to reduce the delay. This enhancement is projected to achieve better improvement if most of the nodes run in low duty cycles at the MAC layer. Cooja simulator using the Contiki 3.0 operating system is used to evaluate the performance of the proposed enhancement. The results inferred that the proposed enhanced scheme is better than the Expected Transmission Count (ETC) approach in terms of end-to-end delay. The end-to-end delay of all nodes is reduced, particularly for the nodes positioned far from the root node.