QoS-Aware Call Admission Control (QA-CAC) Scheme for LTE Networks

Quality of Service (QoS) provisioning is a critical challenge in any wireless broadband (WiBB) network. LTE being a WiBB network technology aimed at providing adequate network resources for speedy transmission of applications with varying QoS requirements. It uses radio resource management (RRM) techniques such as call admission control (CAC) for resource utilization and to guarantee these QoS requirements. In this paper, a novel call admission control scheme is proposed to guarantee the QoS of calls and also increase the throughput of Real-time (RT) calls. The scheme allocates maximum bandwidth requirements to both RT and NRT calls at the point of admission. It then degrades all admitted NRT calls when a call arrives and there are insufficient resources to admit the requested call. Several simulation experiments were conducted with the aid of Vienna LTE system level simulator and the results reveal that the proposed scheme achieved superior performance in terms of throughput and blocking rate of RT traffic compared to the benchmark scheme