Investigation of mobile cellular system performance using queuing theorem for arrival requests

One of the main advantages of new wireless systems is the freedom to make and receive calls anywhere and at any time; handoffs are considered a key element for providing this mobility. This paper presents the handoff queuing problem in cellular networks. The queuing priority is employed to enhance the performance of the system in terms of reduced blocking probability of handoff calls and original calls. It proposes a model to study handoff queuing schemes, and provides a performance evaluation of these schemes. The paper begins by a presentation of the different handoff strategies and prioritization queuing scheme to evaluate, then gives an evaluation model with the different assumption considered in the simulations. The evaluation concerns the blocking probability for handoff and original calls with queue size for each other. These simulations are conducted for each scheme, according to different offered loads, size of call (original and handoff) queue, and number of voice channels. A model is proposed and introduced in this paper for the study of channel assignment schemes; the non-prioritized schemes, the original call queuing schemes, and the handoff call queuing schemes. Finally a comparison among these schemes is presented and observed that the blocking probability of handoff calls is affected visibly by original calls queue size.