The effect of originating call and handoff call for two selected different environments

Abstract

In cellular networks, 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.  This research evaluates cellular channel performance in terms of probability of blocking. It examines the queuing system that will be more suitable when either or both priority is given preference. It was 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 to provides the best network optimization. At the queue size of 2 in the site located at Umudike, the probability of blocking was approximately at 0.022. This effect was insignificant since it does not really make any difference due to the initial probability of blocking. Thus, system of either queuing the originating calls or the handoff calls can be employed. For a very efficient system like the site at Lodu Ndume, it was seen that the maximum blocking probability that can ever be offered to an originating call when handoff calls are queued was 0.000419 (4.19 x 10^-4). This probability was very small; which means queuing handoff calls will hardly have any effect on the originating calls as the blocking probability of the originating calls rises only by a very small margin. The research concludes that, the blocking probability decreases with increasing number of channels and decreasing amount of loads.