Refined approximations for performance analysis and optimization of queueing model with guard channels for handovers in cellular networks

The queueing model of a single cell of wireless network with guard channels is investigated taking into account handover effect. A new effective method for calculation of loss probability of both new and handover calls as well as average number of busy channels is developed. In contrast to known papers, it is supposed here that both new and handover calls have same distribution but with different mean rates. Problems of finding optimal number of guard channels in terms of defined quality-of-service (QoS) provisioning are solved. At that QoS is defined by indicating upper bounds for lost probabilities of new and handover calls as well as lower bound for number of busy channels. Results of numerical experiments are given.