Performances evaluation and Congestion Analysis in IoT Network: Simulation and Emulation approach

The age of the massive Internet of Things (IoT) is forthcoming, transforming real-world objects into intelligent virtual objects and offering practical and high-quality innovative services. The Constrained Application Protocol (CoAP) was adopted as an efficient candidate to transmit collected data over-constrained environments. However, the congestion control scheme of CoAP and its advanced versions still do not cope with the massive deployment of heterogeneous devices and simultaneous transmission, which increases congestion implying the unsatisfactory of many applications with various requirements and the energy-efficiency reduction. As the first step in our study to improve the CoAP congestion control, we deeply analyzed in this work the network performance when CoAP congestion control operates in an IoT network. We varied several parameters at different levels: the network, the CoAP protocol itself, and the node processing capacity. This performance analysis is performed by simulation under Cooja/Contiki. Obtained results show the limitations of CoAP and the need to adjust the parameters of CoAP, whether the network state is congested or not.