Next generation core networks
The next generation core networks are defined on the basis of their underlying technological
“components” that include – as mentioned in the ITU definition – packet-based networks, with the service
layer separated by the transport layer, which transforms them into a platform of converged infrastructure
for a range of previously distinct networks and related services. These features may have an impact on
traditional business models and market structure, as well as on regulation:
IP-based network: “Next generation core networks” generally cover the migration from multiple
legacy core networks to IP-based networks for the provision of all services. This means that all
information is transmitted via packets. Packets can take different routes to the same destination,
and therefore do not require the establishment of an end-to-end dedicated path as is the case for
PSTN-based communications.
Packet-based, multi-purpose: While traditionally separate networks are used to provide voice,
data and video applications, each requiring separate access devices, with NGN different kinds of
applications can be transformed into packets, labelled accordingly and delivered simultaneously
over a number of different transport technologies, allowing a shift from single-purpose networks
(one network, one service), to multi-purpose networks (one network, many services). Inter-
working between the NGN and existing networks such as PSTN, ISDN, cable, and mobile
networks can be provided by means of media gateways.
Separation of transport and service layer: This constitutes the key common factor between NGN
and convergence, bringing about the radical change in relationship between network “layers”
(transport infrastructure, transport services and control, content services and applications). In next
generation networks service-related functions are independent from underlying transport-related
technologies (Figure 1). The uncoupling of applications and networks allow applications to be
defined directly at the service level and provided seamlessly over different platforms, allowing
for market entry by multiple service providers on a non-discriminatory basis.
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