Call Admission Control Scheme and Handover Management in LTE Femtocell-Macrocell Integrated Networks

摘要

The femtocell technology is a quick and intelligent solution that improving system coverage and capacity to meet the great demand of services on broadband wireless access, the deployment of access point femtocells will unload a great quantity of traffic from the LTE macrocellular to be managed by the femtocellular network. Switching seamlessly between macrocell and femtocell base stations is a major challenge of LTE femtocell-macrocell integrated system; which is performed by the handover procedure that can guarantee an efficient transfer of UE from/to or between femtocells, and also offer an effective management of handover calls in the system. The intelligent LTE integrated system architecture, a generation and the optimization of neighboring list that contain the best cells for handover, efficient algorithm for call admission control, and also an optimized handover procedure are the most important topics for research. The intelligent LTE integrated system architecture is necessary to satisfy different criteria, as minimizing handover interruption, guarantee and assure minimum signaling overhead due to frequent and unnecessary handovers…so to determine a single handover decision making policy is not sufficient to develop the performance,? thus in this paper we propose a call admission control policy to reduce the redundant handovers in the system and an improved process to create a neighboring list with best cells for handover and an appropriate ones for? successful and efficient handover. Firstly, we present the LTE femtocell-macrocell integrated network architecture with a large deployment of femtocells. We propose the details signaling flux for handover procedure for different scenarios and the proposed CAC scheme to minimize the unnecessary handovers, based on an optimized neighboring list.