Abstract
In this paper we analytically derive the sojourn time of a
user accessing an online IPTV recording service. Basically, the system
consists of a server (or server farm) and the bandwidth at which a user
can download recorded files depends on the number of other concurrently
downloading users. In particular, we consider both cases, one in which the
user’s download speed is limited by his own access bandwidth, whereas in
the other case the server is the bottleneck and all downloading users share
the server’s upload capacity. Our model includes user impatience which
depends on the actual download speed. A user may abort his download
attempt if a threshold duration is exceeded. The file size distribution is
obtained by measurements of offered files at an existing server.
Users
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