Enhancement of System Information Acquisition for User Based CSG Femtocells in Heterogeneous Network

Abstract

In LTE/LTE-Advanced networks, system information (SI) acquisition is one of the important parts for accomplishment of handover (HO) to closed subscriber group femtocells. Long measurement gaps and transfer of information during system information (SI) acquisition leads to a degradation of the service quality of the user or radio link failure. In this paper, we run simulations on SI acquisition schemes for user based CSG femtocell inbound using system acquisition from the nearest co-Base station users to avoid interruption ongoing services via intra-frequency measurement scenario and compare with the existing of SI acquisition schemes such as scheduled, semi scheduled and autonomous scheme. Additionally, we propose an improved SI acquisition scheme to reduce measurement gap and minimize the latency of the SI acquisition during the inbound HO evaluation phase with a reduction of time during consideration and valuation of the HO phase. Simulation results show that the performance of the proposed scheme is better than that of the existing SI acquisition schemes by approximately 85%.