Page 83 - 5G Basics - Core Network Aspects

Core network aspects 1

Figure 7-20 is a procedural diagram of DAN functions for this scenario.

1) The service provider transmits the QoS requirements of the NDOs to the DAN network with labels
in the names of the NDOs, e.g., "/Phone/" or "/FDS/".
2) The end user requests an NDO from its service provider with the names, e.g., "/Phone/NDO" or
"/FDS/NDO".
3) The traffic control functions of the intermediate DAN elements identify the required QoS of the
request by the name and inform its content delivery function how to forward the requested NDO to
the end user.
4) The service provider forwards the requested NDO to the DAN network.
5) The DAN network determines a route based on the QoS requirement of the requested NDO and the
information of DAN networks, e.g., traffic and topology. The NDO is forwarded to the end user
following the determined route.

Figure 7-20 – Use case of traffic engineering DAN
7.10.1 Benefits

The properties of data objects are exposed to DAN elements in the form of the names or the attributes of
the data objects, which is known as the data awareness of DAN. The properties enable DAN elements to treat
individual data flows differently according to their requirements, e.g., delay sensitive or network conditions.
While such an awareness feature in DAN is supported in a native manner by the architecture, conventional
networks need a technology, e.g., deep packet inspection (DPI), to be aware of data flows.

Moreover, conventional networks secure connection, not the data object individually. For instance, the
hypertext transfer protocol – secure (HTTPS) widely adopted in recent years disables the awareness by
encrypting data flows from one end to the other. Thus, even though different types of data objects, e.g.,
cacheable or non-cacheable, are transferred through the secure connection, it is not possible to differentiate
the data objects and cache them selectively. On the other hand, DAN deals with individual data objects
selectively for caching or processing because its security mechanism is applied for each data object rather
than the connection.
With this service scenario, network operators can use the network resource more efficiently by enforcing
data flows to follow less utilized paths in the network. At the same time, network operators can also provide
more elaborated service for end users since they can identify data flows and treat them differently based on
the requirements. This service scenario shows a potential possibility of how DAN can be operated within the

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