Page 72 - 5G Basics - Core Network Aspects

1 Core network aspects

operator also benefit from DAN due to its efficient data collection. This mechanism can efficiently reduce
transmission delay and simplify mobility management over ubiquitous DAN elements.

7.5 Networking in a disaster area

This service scenario describes DAN as a communication architecture which provides an efficient and resilient
data dissemination in a disaster area, e.g., north eastern Japan (Tōhoku) hit by an earthquake and tsunami
on 11 March 2011 [b-FG-DR&NRR].
A provider can directly disseminate emergency data to a particular person or group of people. In this case,
consumers can express their interest in particular emergency data in advance so that DAN can deliver
emergency data when they are available. A provider can directly disseminate emergency data to many and
unspecified people regardless of any prior request for such a service.
A provider can push emergency data to the cache or storage of DAN elements and then DAN elements can
indirectly deliver emergency data from their caches or storages to a particular person, a group of people or
many and unspecified people in the network.

DAN elements have sufficient storage capacity and so they can hold emergency data for a long time.
Provider(s) and consumer(s) can use the storage as intermediate devices to share any emergency data with
others during a disaster period.

A DAN mobile element, e.g., carried by vehicles and rescuers, can deliver emergency data among fragmented
networks. A fragmented network is one that is locally connected by wired or wireless links without any
connections to a wide area network (WAN) service such as the Internet. A typical example is a cell covered
by a base station isolated from the WAN.

Figure 7-9 depicts a sample scenario for networking in a disaster area.

Figure 7-9 – Networking in a disaster area with DAN

The operational procedures of the scenario are as follows:
1) An end user subscribes to emergency data from the service provider.
2) The emergency data are pushed to the subscriber when they are available.
3) The service provider may push the emergency data to the DAN element close to the disaster area.

4) Then the DAN element informs many and unspecified people of the emergency situation by pushing
the emergency data to them.

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