Evaluating the effect of fifo queuing system on originating and handoff calls

Thumbnail Image
Journal Title
Journal ISSN
Volume Title
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 calls. 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 thesis 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 calls or the 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.
A thesis submitted to the Department of Electrical/ Electronic Engineering, Kwame Nkrumah University of Science and Technology, Kumasi in partial fulfilment of the requirements for the degree of Master of Science in Telecommunication Engineering. 2015