Page 487 - 2015 Security in Telecommunications and Information Technology

Unleashing the potential of the Internet of Things 5

order to describe and analyse the capabilities of the IoT. It is anticipated that there is no need to cover all
possible implementation views of the IoT functional framework: the implementation view of the IoT is in fact
only used for showing the implementability of the IoT capabilities, so one implementation view of the IoT is
sufficient to show this possibility.
7.2.1 Structure of an implementation view

An implementation view of the IoT functional framework consists of the functional entities of the
IoT, and their high level relations. Figure 7-2 illustrates an implementation view of the IoT functional
framework based on the IoT reference model specified in [ITU-T Y.2060] and the IoT common
requirements specified in [ITU-T Y.2066], and building over functional entities described in the NGN
functional architecture [ITU-T Y.2012].

Figure 7-2 – Implementation view of the IoT functional framework building over the NGN
functional architecture
There are two classes of functional entities in this implementation view of the IoT functional
framework, one is for the functional entities already specified for the NGN [ITU-T Y.2012], and
another is for the functional entities specific to the IoT.
The functional entities that are illustrated by green boxes in Figure 7-2 are the functional entities
specific to the IoT (to be specified in this Recommendation), while the functional entities illustrated
by differently coloured boxes are the functional entities described in [ITU-T Y.2012]. Among the
functional entities described in [ITU-T Y.2012], the functional entities illustrated by the same colour
belong to a single functional layer except the Management and Identity Management functional entity
that crosses all functional layers of the IoT reference model [ITU-T Y.2060].
Even if some end-user functions are already mentioned in NGN Recommendations, these
Recommendations only cover specifications on interactions between end-user functions and other
NGN functions. There is no specification of end-user functions. In the implementation view, the end-
user functions are needed to be described in order to cover the possibility that the IoT device
capabilities are implemented in end-user functional entities. The "End-User" functional entity of
NGN Recommendations enhanced with some IoT device capabilities is named as "End-User Device"
functional entity in this Recommendation.

Rec. ITU-T Y.4401/Y.2068 (03/2015) 473