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We denote by , , and as the average arrival rate of
clients,
the length of
the video, and the threshold value, respectively. We use the following performance metrics in our evaluation: (1) *Rejection
probability () * - the probability
that a client cannot be admitted and served; (2) *Normalized
workload ()* - the product of average client arrival rate and video
length, ; (3) *Effective normalized workload (* -
the admitted normalized workload, ;
(4) *Average workload placed on the network/Network usage ()* -
the sum of all link usage,
,
where the link usage of link , , is the product of link utilization
and its capacity. Hence network usage represents the average workload
placed on a network; (5) *Server stress ()* - the average amount of
bandwidth used at the server; (6) *Startup delay ()* - the
time that clients have to wait before actually receiving the video and
playing it back.
In the following simulation we assume
that the video length is 100 minutes.

Yang Guo
2003-03-27