Page 67 - 5G Basics - Core Network Aspects

Core network aspects 1

The operational procedures of the scenario are as follows:

1) Sensors generate sensor data and send them to the first hop DAN element. The DAN element stores
the sensor data as NDOs and distributes routing information that leads towards the NDOs.
2) Terminal A (user PC) requests an NDO using its ID. The request is routed to the first hop DAN element
from the sensors.
3) The NDO is transferred back to terminal A. The NDO is stored on selected DAN elements along the
transferred path, e.g., close to terminal A.
4) Subsequently, other terminals that are connected to the same DAN element as terminal A request
and retrieve the same NDO from the first hop DAN element from terminal A.
5) Terminal B (sensor processing server) and other terminals that are connected to the same DAN
element subscribe to an NDO, and the first hop DAN element from terminal B distributes routing
information that directs the request for the NDO towards itself.
6) NDOs stored on the first hop DAN element from the sensors are transferred to the first hop element
from terminal B and they are sent to connecting terminals including terminal B by multicast.
7) The service provider requests the NDO from the first hop DAN element from the sensors. At this
time, the request hits the cached NDO on the DAN element.
8) NDOs stored on the intermediate DAN elements are processed (e.g., aggregated and compressed)
according to a preconfigured policy and the processed NDOs are sent to the service provider using
a pre-set route.
Figure 7-4 is a procedural diagram of DAN functions for sensor networking service.

Figure 7-4 – Use case of sensor networking with DAN
1) The end user and service provider subscribe to NDOs. The service provider additionally specifies a
processing policy (e.g., aggregation and compression) that should be applied to the subscribed
NDOs.
2) The end user publishes the NDOs.
3) The DAN network provider transfers the NDOs to end users who subscribe to the NDOs.
4) The DAN network provider processes the NDOs based on the processing policy and transfers the
processed NDO to the service provider.

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