Page 80 - 5G Basics - Core Network Aspects

1 Core network aspects

4) Either the DAN element (4-1) or the service provider (4-2) supplies the NDO-data as a result of the
execution to the end user. If NDO-func is a DAN element, the DAN element executes the NDO-func,
produces NDO-data as a result of execution and supplies it.
7.8.1 Benefits

A network operator can benefit from this DAN service scenario because of the reduction of traffic load in the
core network and CPU load in the computing servers, thanks to the ubiquitous caching capability of DAN,
which also enables load balance in a native manner.

An end user can benefit from DAN because of the shortening of the response time due to the fact that data
as well as data-processing functions can be cached close to the end user and directly serve user requests
from the caching points. In addition, since the whole data-processing operation can be carried out between
the end user node and nearby caching nodes, the risk that user information gets intercepted is relatively low,
which protects user privacy in an appropriate manner.

An application developer can benefit from DAN in regards to easy programming of network applications, e.g.,
easy specification of interfaces for calling other applications by name.

7.9 Multihoming with DAN
Nowadays mobile devices are equipped with multiple wireless interfaces such as bluetooth, WLAN and long-
term evolution (LTE). Each of them has unique advantages in terms of bandwidth, network access costs,
coverage, etc. However, current IP networks cannot fully utilize the benefits because they basically cannot
forward selected data flows to a specified network interface.

DAN is based on the operation of name-based routing where each data flow is identified and forwarded to
selected network interfaces. For this reason, DAN is able inherently to support this service scenario.

Figure 7-17 depicts a sample scenario to support a multihomed mobile device using DAN. Suppose three end
users, S1, S2 and S3, in a train want to watch a TV programme with their smartphones, which have different
types of wireless interfaces, e.g., bluetooth, WLAN and LTE.

Figure 7-17 – Multihoming with DAN

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