Page 162 - 5G Basics - Core Network Aspects

1 Core network aspects

1 Scope
This Recommendation describes the functional requirements of software-defined networking (SDN), which
are defined in [ITU-T Y.3300], by providing:
– general requirements,
– functional requirements of the SDN application layer,

– functional requirements of the SDN control layer,
– functional requirements of the SDN resource layer, and
– functional requirements of the multilayer management functions.
NOTE – In [ITU-T Y.3300] the term "application layer" refers to "SDN application layer" and "resource layer" refers to
"SDN resource layer". As the names "application layer" and "resource layer" are too general this Recommendation uses
more specific names of layers such as "SDN application layer" and "SDN resource layer".

2 References
The following ITU-T Recommendations and other references contain provisions which, through reference in
this text, constitute provisions of this Recommendation. At the time of publication, the editions indicated
were valid. All Recommendations and other references are subject to revision; users of this Recommendation
are therefore encouraged to investigate the possibility of applying the most recent edition of the
Recommendations and other references listed below. A list of the currently valid ITU-T Recommendations is
regularly published. The reference to a document within this Recommendation does not give it, as a stand-
alone document, the status of a Recommendation.
[ITU-T Y.3011] Recommendation ITU-T Y.3011 (2012), Framework of network virtualization for
future networks.
[ITU-T Y.3300] Recommendation ITU-T Y.3300 (2014), Framework of software-defined
networking.

3 Definitions

3.1 Terms defined elsewhere
This Recommendation uses the following terms defined elsewhere:

3.1.1 software-defined networking [ITU-T Y.3300]: A set of techniques that enables to directly program,
orchestrate, control and manage network resources, which facilitates the design, delivery and operation of
network services in a dynamic and scalable manner.

3.1.2 network virtualization [ITU-T Y.3011]: A technology that enables the creation of logically isolated
network partitions over shared physical networks so that heterogeneous collection of multiple virtual
networks can simultaneously coexist over the shared networks. This includes the aggregation of multiple
resources in a provider and appearing as a single resource.
3.1.3 virtual resource [ITU-T Y.3011]: An abstraction of physical or logical resource, which may have
different characteristics from the physical or logical resource and whose capability may be not bound to the
capability of the physical or logical resource.

3.2 Terms defined in this Recommendation
None.

4 Abbreviations and acronyms
This Recommendation uses the following abbreviations and acronyms:

BSS Business Support Systems

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