PERFORMANCE EVALUATION OF CELL-TIME RESERVATION SCHEME IN CELLULAR NETWORKS

Abstract

Future mobile communication systems are required to support broadband multimedia services with diverse quality of service (QoS) requirements. To utilize the radio spectrum efficiently, the cellular architecture is used in wireless networks. Users may experience performance degradations due to mobile handoffs which is magnified in future micro/pico- cellular networks. Since forced call termination is more objectionable than new call blocking, handoff dropping probability can be considered as key connection-level QoS metric. Maximizing the resource utilization while keeping probability of new call blocking below a target value is also a critical factor. By predicting the potential future cells to reserve resources and forward data to the right BS prior to the arrival of a MH it is possible to address handoffs issue. Cell-Time reservation scheme is a mobility-based bandwidth reservation scheme. It uses the mobility history of the mobile users to predict the next possible cell of a mobile user. In order to utilize the resources more efficiently, Cell-Time reservation scheme not only predicts the cell into which a mobile user will hand offs but also when the handoff will occur. Based on the mobility prediction, this scheme reserves the bandwidth to guarantee some handoff dropping probability. By adaptively controlling the admission threshold Cell-Time reservation scheme achieves better balance between guaranteeing handoff dropping probability and maximizing the resource utilization. In this dissertation, Cell-Time reservation scheme is simulated. Cell-Time reservation achieved the handoff dropping probability always less than the target handoff dropping probability irrespective of load. The Cell-Time reservation scheme is compared with traditional static reservation scheme