Cost optimization due to waiting times of prioritized Handoff calls in wireless networks

Abstract

A dynamic scheme for optimal waiting time in handoff calls is proposed in this paper, in wireless networks, the total system waiting time include both of new calls and handoff calls. In the viewpoint, efficient reduction of the waiting time is beneficial to the performance. Eventually the quality of service can be effectively improved. In wireless environments, the event of handoff occurs frequently when mobiles are moving from one cell to another cell. Handoff calls are preferred than new calls when congestion occurs due to threshold of the waiting time. Therefore significantly reduce the total system waiting time due to handoff calls become a stringent issue. In our study, handoff calls are granted for various classes. Different priorities are allocated for different class of handoff calls to achieve the optimal total system cost caused from the waiting time. In addition, each class of handoff call is granted with a weighting factor for cost estimation. The value of the weighting factor is thought as the cost per one unit of waiting time. Under the constraint of fixed total weighting factor, the system total cost caused by the waiting time is minimized by properly dividing the weighting factor for different priorities of the handoff calls. Through our discipline, the total system cost for the waiting time is optimized. The contribution is focused on reduction of the system cost caused from the waiting time effectively as compared to non-control disciplines.