Page 163 - 5G Basics - Core Network Aspects

Core network aspects 1

FCAPS Fault, Configuration, Accounting, Performance and Security

IP Internet Protocol
MAC Media Access Control
OSS Operations Support Systems
SDN Software-Defined Networking

5 Conventions
This Recommendation uses the following conventions:

The term "is required to" indicates a requirement which must be strictly followed and from which no
deviation is permitted, if conformance to this Recommendation is to be claimed.

The term "is recommended" indicates a requirement which is recommended but which is not absolutely
required. Thus, this requirement need not be present to claim conformance.

6 Overview
[ITU-T Y.3300], the framework of SDN, defines SDN as a set of techniques that enables network resources to
be directly programmed, orchestrated, controlled and managed, which facilitates the design, delivery and
operation of network services in a dynamic and scalable manner. The high-level architecture of SDN in the
framework consists of the application layer, SDN control layer, resource layer and multilayer management
functions. The application layer executes SDN applications and enables network resources to act as instructed
from SDN applications in a programmatic manner via the SDN control layer. The SDN control layer provides
a means to control the behaviours of network resources via resource-control interfaces. The resource layer
performs the transporting and the processing of data packets based on the decisions of the SDN control layer.
The multilayer management functions provide functionalities for managing other layers including FCAPS.

This Recommendation defines the following functional requirements of SDN:
– general requirements;
– SDN application layer;
– SDN control layer;

– SDN resource layer; and
– multilayer management functions.

7 Functional requirements

7.1 General requirements
The general requirements are as follows:

– It is required to provide interoperability with external OSS/BSS.
– It is required to provide an orchestration functionality of the SDN application layer and SDN control
layer, and multilayer management to handle the lifecycle management of software-based SDN
functions.
– It is required to provide scalability for supporting a large number of users and vast geographical
areas.
– It is required to provide a management support functionality in each layer to enable the delegation
of multilayer management functions.
– It is recommended to maximize the energy-efficient usage of physical resources of all layers.

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