Effect of Leaky-Bucket-Based Traffic Shaping on Capacity Enhancement for VSG-CDMA Cellular Networks

In this paper, we propose data traffic shaping via leaky bucket in order to reduce outage probability and enhance capacity of voice users for uplink variable spreading gain code-division multiple-access (VSG-CDMA) cellular networks. In order to analyze the effect of leaky bucket mechanism, we employ a closed Jackson queueing network with arbitrary service time distributions to model different states of a typical traffic-shaped data user. By solving the concerned queueing network, we obtain the steady state probability with which a typical data user exist at each state. By aggregating the effects of all data and voice users we obtain mean and variance of interference and compute the outage probability for different number of voice users. At the last part of the paper, we show the efficiency of the proposed traffic shaping on capacity enhancement, at the cost of delay degradation for data users, in different conditions.