No abstract

Femtocell is a small cellular base station in home, a low-power wireless access point designed for use in residential or small business environment, this technology is a promising solution for operators to improve network performance, and the deployment of a femtocell is a key for bandwidth limitation and coverage issues in conventional mobile network system. Therefore, the inter-cell handover process will become more complex, frequent and time-sensitive with the introduction of femtocells in cellular networks. This paper presents the architecture of LTE femtocell networks and investigates the different scenarios in the handoverprocedure. Especially, the mobility of user from macrocell to femtocell which is quite difficult due to the large number of candidate femtocells in the coverage area and the characteristics of the femtocell entity, In order to achieve the optimize procedure handover decision policy based on using the advantage of the entity HeNB Policy Function to select and make decision of handover based on different constraint to make the optimal decision about the target femtocell to mitigate the unnecessary handovers, hence we describe the decision policies rules as well as the handover signalling flow furthermore, an analytical model was presented for the handover signalling cost.

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.