Читать книгу Service Level Management in Emerging Environments - Nader Mbarek - Страница 46

Having defined the various QoS requirements inherent to each IoT layer and the mechanisms that can enable QoS in each layer, we must specify the requirements and mechanisms to provide end-to-end QoS across the different layers of the IoT architecture. This end-to-end QoS allows clients to perceive the service level provided. The client (IoT application user) evaluates the overall level of end-to-end QoS and does not differentiate between the different levels into which the QoS is divided.

Different research studies have focused on end-to-end QoS in the IoT and specify the different needs relating to this type of environment. First of all, the IoT environment must be capable of prioritizing certain flows and services based on their requirements. IoT users who have paid for privileged services must be able to benefit from these. In addition, the deployment of the IoT, starting from the device layer up to the hosting of the application at the support layer, must be carried out in an optimal way to take into account the capabilities required from the different components. The gateways must be able to process the volume of data transmitted by the objects while the Cloud service must be able to provide the necessary computing and storage capabilities. Similarly, all components of the IoT environment must be capable of adapting themselves in real-time to meet the needs of different user flows. The QoS requirements for different layers of the architecture must then be translated such that they are comprehensible to the other layers. This translation allows different IoT layers to communicate with each other in order to meet QoS requirements. Consequently, guaranteeing end-to-end QoS in the IoT first requires breaking down QoS needs according to the different layers of the IoT architecture and then finding mechanisms to apply in a complementary manner between these layers.