Abstract
Using instantaneous aggregate arrival rate as an admission control
parameter will contribute to either bandwidth under-utilization or
over-utilization. Being bursty in nature and variable in rate, video
flows might encode any rate between a range of minimum and maximum
values. At the time the decision is made, if the measured rate is at the
minimum value, the bandwidth might be over-utilized due to accepting
more sessions than the link can accommodate. In contrast, it might be
under-utilized if the measured rate is at the maximum value due to
rejecting more sessions than the link can accommodate. The burstiness
can be taken into account by considering the past history of the
traffic. This paper investigates the suitability of the average
aggregate arrival rate instead of the instantaneous aggregate arrival
rate for video admission decisions. It establishes a mathematical model
to predict the relationship between the two rates. Simulation results
confirm that the average aggregate arrival rate is a more efficient
decision factor for a small number of flows. Although it has no
additional advantage for moderate and large number of flows, it still
can stabilize the admission decision by smoothing the burstiness of a
set of the instantaneous rates (within the measurement period) over a
period of time.