In recent years, the Underwater Internet of Things (IoUT) has become a popular technology for exploring the underwater environment. IoUT enables administrators to explore and monitor underwater environmental phenomena from anywhere in the world where there is Internet access. Due to the harsh underwater environment, the reliability of communication between sensor nodes deteriorates, causing certain performance issues such as higher packet loss rate and long end-to-end delay. Therefore, it is essential to manage the communications between the sensors to address these problems in order to improve the QoS. Software-defined networking (SDN) is one of the most promising architectures for providing efficient network management by decoupling the data plane from the control plane of the network. This paper proposes a new QoS routing technique for SDN-based IoUT aiming at improving QoS by establishing reliable paths between sensor nodes. To do this, the controller gathers the 3D coordinates of each underwater sensor in order to compute the distance between the nodes. Then, it estimates the reliability of each link by using underwater acoustic equations. Finally, it calculates the most reliable path with minimum delay and installs the path on the nodes located along it. The experimental results show that our mechanism significantly outperforms other non-SDN approaches in terms of several performance measures ranging from packet loss ratio and end-to-end delay to energy consumption.

近年来，水下物联网（IoUT）已成为探索水下环境的流行技术。IoUT 使管理员能够从世界上任何有 Internet 访问的地方探索和监控水下环境现象。由于恶劣的水下环境，传感器节点之间通信的可靠性变差，导致丢包率高、端到端时延长等性能问题。因此，管理传感器之间的通信以解决这些问题以提高服务质量至关重要。软件定义网络 (SDN) 是通过将数据平面与网络控制平面解耦来提供高效网络管理的最有前途的架构之一。本文提出了一种新的基于 SDN 的 IoUT QoS 路由技术，旨在通过在传感器节点之间建立可靠的路径来提高 QoS。为此，控制器收集每个水下传感器的 3D 坐标以计算节点之间的距离。然后，它通过使用水声方程估计每个环节的可靠性。最后，它以最小的延迟计算最可靠的路径，并将路径安装在沿途的节点上。实验结果表明，我们的机制在丢包率和端到端延迟到能耗等多项性能指标方面明显优于其他非 SDN 方法。控制器收集每个水下传感器的 3D 坐标以计算节点之间的距离。然后，它通过使用水声方程估计每个环节的可靠性。最后，它以最小的延迟计算最可靠的路径，并将路径安装在沿途的节点上。实验结果表明，我们的机制在丢包率和端到端延迟到能耗等多项性能指标方面明显优于其他非 SDN 方法。控制器收集每个水下传感器的 3D 坐标以计算节点之间的距离。然后，它通过使用水声方程估计每个环节的可靠性。最后，它以最小的延迟计算最可靠的路径，并将路径安装在沿途的节点上。实验结果表明，我们的机制在丢包率和端到端延迟到能耗等多项性能指标方面明显优于其他非 SDN 方法。