Читать книгу Service Level Management in Emerging Environments - Nader Mbarek - Страница 15

The ITU-T proposed a reference model for the IoT that is based on multiple layers (ITU-T 2012). This reference model (see Figure 1.1) defines four horizontal layers (application, support, network and devices) and two vertical layers (management and security). The application layer includes IoT applications and services. Next, the Service Support and Application Support Layer defines the capacities for generic support that are common to all applications, such as data processing and storage. This also includes specific support capacities that respond to the needs of a particular application. The Network Layer offers two services. First there are network capacities, which ensure that connectivity, mobility management, authentication, authorization and accounting functions are all monitored. Second, there are transport capacities that control the routing of data coming from applications or information from the monitoring and management of the environment. The Device Layer defines the capacities of each connected object and device as well as the capacities of the communication gateways.

The vertical layers define the generic management capacities (management of objects, network, traffic and congestion) as well as the security capacities (authorization, authentication, integrity and privacy protection). Further, these vertical layers introduce specific capacities that are dependent on the type of IoT application being considered.

Figure 1.1. The ITU-T architecture of the Internet of Things (ITU-T 2012). For a color version of this figure, see www.iste.co.uk/mbarek/service.zip