Page 64 - 5G Basics - Core Network Aspects

1 Core network aspects

The aim of this Supplement is to introduce the scenarios and use cases of DAN, which provides a technical
context that is expected to be useful for discussions on architectural requirements of DAN in further
documents to be developed, and also to clarify the roles and interactions of the various types of DAN entities
for services delivered via DAN.

The set of the scenarios and use cases is not intended to be exhaustive, but sufficient enough to provide an
understanding of DAN operation. Currently, this Supplement includes a set of use case scenarios: 1) content
dissemination; 2) sensor networking; 3) vehicular networking; 4) automated driving; 5) networking in a
disaster area; 6) advanced metering infrastructure (AMI) in a smart grid; 7) proactive video caching;
8) in-network data processing; 9) multihoming; and 10) traffic engineering. It may be updated as new use
cases are identified as being helpful in understanding the operation of DAN or in deriving its architectural
requirements.

7 Service scenarios

7.1 Content dissemination
This service scenario describes DAN as a cooperative caching architecture for efficient content dissemination.
This service provides users with fast and reliable access by distributing content to ubiquitous caching points
located close to users. Moreover, due to the context awareness of DAN, each caching point can easily adapt
the content in terms of the given context from users, and serve it to them accordingly.
DAN can be deployed either by content distributors, e.g., content delivery networks (CDNs), or by network
operators, e.g., internet service providers (ISPs). While content distributors aim to make a profit by providing
delivery services for content providers, network operators deploy DAN mainly to reduce transit traffic or
improve quality of service (QoS) for users.
For the distribution of content files, either the DAN operator actively pushes popular content to caching
points to deal with some events, e.g., flash crowd, or contents can be passively cached at points along the
downloading path while being pulled from the requester. Routing mechanisms in DAN are responsible for
directing users' requests to appropriate caching points. The routing mechanisms also interact with the
distribution mechanisms in order to keep content at caching points up-to-date.
Figure 7-1 depicts a sample scenario for content dissemination service using DAN.

Figure 7-1 – Content dissemination using DAN

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