Abstract:
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We validate a call admission control (CAC) method for
mobile cellular networks under more restrictive conditions than
those assumed in its design. The method uses distribution and the
first and second moments of the channel holding time (CHT)
parameter to compute the algorithm’s main admission control
metric: remaining CHT. Our goal is to generalize the handover
method when only the mean and variance of CHT are known,
but precise knowledge of the CHT’s complete distribution is not
available. The problem is of practical interest because probability
distribution fitting can be time- and CPU-intensive. To this end,
we use an approximation of the expected remaining holding time
instead of its exact value. We show that for a variety of traffic
conditions and the general gamma distribution, the
approximation yields acceptable results. For a log-normal
distribution, our results also suggest that the algorithm can be
defined based solely on the mean and variance of CHT. |