Page 297 - Big data - Concept and application for telecommunications

Big data - Concept and application for telecommunications 5

2) support for network virtualization, and;

3) network customization, for efficient and effective network deployments and operations.
Requirements for SDN [ITU-T Y.3300] include:
1) separation of SDN control from network resources;
2) programmability of network resources;
3) abstraction of network resources, by means of standard information and data models, and;

4) support for orchestration of network resources and SDN applications.
More detailed requirements are provided in [ITU-T Y.3301].

This Recommendation provides a description of the SDN functional architecture with the aim of ensuring that
the key properties and requirements of SDN are appropriately supported. The SDN functional architecture is
based on the layering framework derived from clause 11 of [ITU-T Y.3300] and shown in Figure 6-1.

Figure 6-1 – SDN layering framework

Considering other efforts to design an SDN architecture [b-ONF-arch 1.0], [b-ONF-arch 1.1], [b-IETF RFC 7426], the
SDN architecture described in this Recommendation takes into account factors that are important in large-scale
public networks:
– Orchestration-based run-time lifecycle management of software-based SDN functions.
Since public networks are becoming even more complex due to the emerging technologies, services
and companion usage behaviors as well as the integration of fixed and mobile networks, SDN
technologies need to contribute to the orchestration of operations and the resulting lifecycle
management of network functions. SDN orchestration in this Recommendation is used to automate
a set of operations;
NOTE – The background, design principle and role of SDN orchestration is described in more details
in Appendix I.
– Interaction with operators’ legacy operations support system (OSS)/business support system (BSS).
The SDN architecture is designed to be capable to interact with the existing OSS/BSS;
– Scalability.
In order to cope with appropriate control and application layers (ALs) performance in SDN networks
potentially involving a huge number of customers, providing various types of services and covering
vast geographical areas, the SDN architecture provides independent control and management
capabilities, which enables performance monitoring of available resources in all layers, and enables
dynamic adaptation of resources, e.g., scaling up and scaling down. The SDN architecture also allows
for implementation of functions in a distributed manner, and enables distribution of fault,
configuration, accounting, performance and security (FCAPS) management in each of the SDN
layers;

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