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Core network aspects 1

Appendix III

Proactive video caching with DAN

Figure III.1 shows the experimental configuration of the proactive video caching mechanism with DAN. There
are three stations equipped with DAN elements and the content source provides video. Video contents are
proactively cached in the DAN element in every station using the scheduler, which decides how many video
contents should be proactively cached based on the train schedule. The experiment was carried out based
on NDN implementation.

Figure III.1 – Experimental setup for proactive caching mechanism with DAN

Figure III.2 shows the throughput changes as the mobile user on the train moves from station A to station C.
The red, green and blue lines show the throughput at each DAN element when the train stops at each
corresponding station, respectively. The pink line shows the throughput observed at the user device. The
black line shows the total of all throughputs, which are defined previously. The scheduler makes sure that
the video content being watched is proactively cached in every station before the train arrives there.

Figure III.2 – Variations of throughputs as a mobile user on a train
moves from station A to C

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