the autonomic management framework mainly consists of:
1) SDN/NFV sensors that can collect the network metrics;
2) monitoring modules that can derive the symptoms from the collected metrics;
3) network intelligence that is in charge of diagnosing network problems and making tactical decisions
4) SDN/NFV actuators and an orchestrator that perform corrective and preventive actions.
the potential architecture for autonomic management can be split into several layers, which are explained as follows:
Infrastructure layer: All NFs managed autonomously by the framework rely on physical and virtualized resources in this layer. It encompasses physical and virtualization sublayers. The former provides an access to physical resources (networking, computing, storage, etc.), while the latter instantiates virtual infrastructures on top of the physical sublayer. It represents the NFVI as defined by the ETSI NFV terminology;
Data network layer: This implies an architectural evolution towards the SDN paradigm by decoupling the CP from the UP. In this framework, the data layer represents a simple data‐forwarding, which can be either a non‐virtualized or virtualized NF
SON control layer: This layer includes two internal sublayers: SDN controllers and SON CP sublayer. SDN/NFV sensors and actuators, which are capable of collecting data from the entire system and enforcing actions, respectively, are also contained. The SON control layer and data network layer have associated CPs and UPs of the network that are decoupled in the SDN paradigm;
SON autonomic layer: To realize the network intelligence, this layer consists of three modules, i.e., monitor, aggregator and analyzer, autonomic manager, and orchestrator. The monitor and analyzer extract metrics related to network behavior, aggregate the collected metrics into health of network (HoN) metrics, and use these to infer the network status. The autonomic manager is in charge of diagnosing the root cause of any existing or potential network problems, and decidingwhich countermeasure should be conducted. Following the tactical decisions from the autonomic manager, the orchestrator coordinates the physical and virtualized resources, and manages the SDN/NFV actuators to execute the decided actions;
NFV orchestration and management layer: This layer is responsible for orchestrating and managing VNFs via the VNF manager, as well as virtualized resources through VIM. It conforms to the NFV MANO specified by ETSI [5];
SON access layer: This is the external interface that is exposed by the framework. Despite the fact that internal components may have specific interfaces for the particular scope of their functions, these components contribute to a general SON API, managed by the SELFNET API broker that exposes all aspects of the autonomic framework to external systems, such as BSS or OSS and administration graphical user interfaces (GUIs). The latter enable network administrators to interact with and configure the SELFNET framework and also observe the complete status of the network.
The Reference :
5G System Design
Architectural and Functional Considerations and Long Term Research
