Abstract: In cellular networks, there exist fixed and dedicated channel for the entire duration of a set up call. The signal strength and interference at various locations differs within a cell and this affects the quality of the on-going call including handoff. This may require the transfer of the on-going call to another cell with a better signal strength. Given a fixed channel at a cell site, and assuming the arrivals of originating calls and handoff requests to be Poissonian, either process could result in queuing. This paper by using Matlab seeks to evaluate in terms of probability of blocking, which queuing system is more suitable when either or both priority are given and when no priority is given. It is observed that, for cell sites with traffic intensity to channel ratio of 0 – 0.75 which is considered as not congested, a system of either queuing the originating or handoff calls can be employed. For a congested system in which the traffic intensity to channel ratio is 0.76 – 1 there should be separate queuing of both the originating calls and the handoff calls. When the cell site is very congested that is, having a traffic intensity to channel ratio of greater than 1, queuing of handoff calls provides the best network optimization.
Keywords: Signal strength, Originating calls, Handoff calls, Poissonian, and Queuing