Intelligent Interference Management for Dense Femtocellular Networks

Abstract

To meet the future demand of high data rates in wireless communication with improved indoor coverage we need a promising new technology. In searching such a new technology, femtocellular technology is one of the promising alternatives, having a low power small cellular base station termed as the femto-access-point FAP). This new technology has some unique features such as it provides good signal quality for the indoor users for supporting high data-rate communication with improved coverage, network capacity, and quality of service. The extreme goal of the ferntocellular technology is highly dense femtocellular deployments, which will require significant degree of self-organization with some intelligent cnfiguration to mitigate interference effects, random unwanted handover, and high level of outage probability. The conventional FAP transmits small power continuously but fernto-user does not stay all the time at home or office. So, continuous transmission of this FAP power cause high interference effect when fcmtocells are deployed densely. To gain control over this continuous power transmission of femtocell this thesis proposes two operational power modes for FAPs which is a new idea of on-demand service connectivity (ODSC) in femtocell termed as low-power femto-idle-mode (FIM) and high-power femto-active-mode (FIM) system. When femto-users are trying to get service from FAP, then FAP automatically changes its mode frorn low power idle mode to high power active mode otherwise FAP remains in idle mode and transmits beacons only in regular intervals. In this intelligent way, FAP transmits low power in idle mode and give less interference effect. The dense deployment of fcmtocell with the proposed ODSC scheme can solve the low level of signalto- noise plus interference ratio (SNTR) and throughput problems in the rnultistoricd building or home environment. The SNIR level, throughput, probability of outage, and probability of activeness of a FAP are analyzed. The simulation results show that the proposed ODSC scheme in femtocdll deployment significantly enhances performance of the SNIR level, throughput, probability of outage, and reduces the probability of activeness of a FAP having no user in the multistoried building or home environment.