  Traditional Wireless Sensor Networks protocols used in Internet of Things
Networks (IoTNs) today face challenges in high- and ultra-density network
topology conditions. New networking paradigms like Software-Defined Networks
(SDN) have emerged as an up-and-coming approach to address IoT application
requirements through implementing global protocol strategies and network
programmability. This paper proposes a divide-and-conquer solution that aims to
improve the PDR in ultra-dense IoT (UDIoT) network environments using network
slicing. As such, we develop and evaluate DENIS-SDN, an open-source SDN
solution for UDIoT Network environments consisting of a modular SDN controller
and an OpenFlow-like data-plane protocol. DENIS-SDN utilizes our Network
Density Control mechanism based on operational specification requirements,
which address the challenges UDIoT network deployments pose, including
interference, congestion, resource management, control, and quality of service
(QoS) performance issues. To achieve this, it divides dense IoT networks into
either logically sliced sub-networks separating nodes using routing rules or
physically sliced sub-networks separating nodes into different radio channels.
We provide evaluation results over realistic scenarios demonstrating improved
PDR performance up to 4.8% for logically and up to 11.6% for physically sliced
network scenarios.
