Content for  TS 28.500  Word version:  16.0.0

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4  Background and conceptsWord‑p. 8

4.1  Background

It is expected that future implementation options for the entities of the 3GPP system include various technologies for virtualization. Network and service providers make use of different information in several different ways which also may vary from network to network and from time to time. Hence, entities of the 3GPP system that have been implemented with virtualization options should be managed in the same manner as entities implemented with non-virtualization options, to the extent possible.
Virtualized 3GPP entities still require some underlying hardware resources. One of the NFV business objectives is that VNFs are procured independently from the underlying hardware resources. The underlying hardware resources are expected to be administered independently from the virtualized entities required for the 3GPP system.

4.2  Concepts

4.2.1  NE and VNF

The components of NE can be shown as below (see Figure 4.2.1-1), where a Network Function (NF) is a processing function in a network which has defined functional behaviour and defined interfaces:
Reproduction of 3GPP TS 28.500, Figure 4.2.1-1: NE components
A VNF is NF(s) that runs on a NFV Infrastructure (NFVI) (see Figure 4.2.1-2):
Reproduction of 3GPP TS 28.500, Figure 4.2.1-2: VNF running on NFVI
Examples for the NE instance
The same telecommunication function of an NE instance could be carried as illustrated in the following examples (see also Figure 4.2.1-3):
One VNF instance composed of one or more VNFC instances running on NFVI.
NF(s) running on dedicated hardware, where the the NF is 3GPP defined mobile network function (as described in Figure in TS 32.102).
Reproduction of 3GPP TS 28.500, Figure 4.2.1-3: Examples of NE instances: a) virtualized and b) non-virtualized.

4.2.2  The relationship between NE and VNFWord‑p. 9
From 3GPP perspective, VNF contains the NE's Network Function(s). The relation between NE instance and VNF instance depends on the relation between the NFs of NE and the functions contained within VNF.
Relation1: The NE instance is 1:1 related to VNF instance if the VNF contains the whole Network Function(s) of the NE.

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