Читать книгу Service Level Management in Emerging Environments - Nader Mbarek - Страница 43

F-Interop Platform, a European project funded by H2020 (November 2015– November 2018), has developed test tools for QoS and Quality of Experience (QoE), based on SDN/NFV (Software Defined Networking/Network Functions Virtualization) that can be used in the IoT (Ziegler 2015). These technologies can replace conventional technologies to guarantee QoS in the network layer of the IoT architecture. SDN technology consists of separating monitoring functions from data routing functions. The SDN controller (the component centralizing the decision making and management of the network formed by network equipment which exchanges data with each other) can impose policies on flows to provide different levels of QoS. NFV technology, on the other hand, makes it possible to provide modules to apply the various policies for the deployment of agents and to emulate network conditions while collecting measurements related to QoS parameters (Ziegler 2015). The collection of QoS statistics (delay, jitter, etc.) may be carried out through the F-Interop solution using a passive or active method. The passive method relies on the collection of QoS statistics from SDN switches on which counters are implemented to measure the throughput or loss of packets, for example. The active method relies on the use of NFV agents to measure QoS parameters in real time. The collection of information relates to data regarding packet loss, delay and jitter (Ziegler 2015).