Call Admission Control for LTE Networks by Using Bandwidth Reservation Algorithm

Abstract

With the rapid growth of wireless communication systems, the number of wireless users has consequently increased. Therefore, wireless networks should be able to provide guaranteed quality of service (QoS) for different services while maintaining high network utilization. The wireless network may also have to decline new call/connection if the resources are not available or this new call/connection would violate the network promises. The process of such decision is called call admission control (CAC). In this thesis a call admission control with bandwidth reservation in LTE network was simulated using two bandwidth reservation methods; the static and the adaptive bandwidth reservation methods using MATLAB R2013a software. The call requests are classified into new call and handoff call, and new calls are classified into voice over IP calls (VoIP) and video calls. Different scenarios were carried out using different values of the thresholds to test the performance of the system. The simulation results showed that the CAC algorithm based on adaptive bandwidth reservation outperformed the static in the handoff and video calls resulting in a lower dropping and blocking probability. The results also showed that an increase in the bandwidth reserve results in a decrease in the dropping and blocking probabilities as more calls are allowed to enter the network.