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In this paper we explore the concept of an all-wireless Network of Femtocells (NoF). A NoF can be seen as a wireless mesh network providing multi-hop connectivity amongst femtocells and, in turn, to the Evolved Packet Core (EPC). As specified by 3GPP Technical Specifications (TS), IP networks are used to transport data through any interface and, in particular, through the S1 interface in the Evolved...
This article deals with the interference limitations of introducing femtocells in existing mobile networks. Femtocells are cheap alternatives for mobile operators to extend their network and to provide better coverage. However, having more femtocells increases the interference in existing components. Finally, the whole system could lock up itself, if the interference exceeds the maximum acceptable...
Due to the dense and self-deployment of home eNodeBs (HeNBs) in femtocells, serious inter-cell interference may arise without good coordination. To deal with it, a distributed interference coordination scheme for femtocells networks with carrier aggregation (CA) is proposed in this paper. Firstly, each femtocell operates on all the component carriers (CCs) of the network and gathers the information...
Femtocells were originally conceived to be deployed in private households and to solve the problem of poor indoor radio coverage as well as to offload traffic from the macrocellular network. The BeFEMTO project investigates and develops technologies that not only vastly improve the radio access capacity of femtocells, but also enables their use in novel scenarios like cooperative femtocell networks,...
With the ever increasing demand for wireless broadband, design of energy efficient systems is paramount. Femtocells, small self installable wireless base stations, are currently being deployed as a solution to the coverage problems faced by mobile operators, particularly in indoor environments. This paper outlines the framework for evaluating the performance of multiple antenna transmit diversity...
The increasing demand of indoor broadband access encourages the diffusion of the "home base stations", known as femtocells. Their self installation nature envisages interference problems due to a possible overload of local femtocell installations in the same area. To reduce the interference among femtocells we propose and analyze the performance of a dynamic frequency selection strategy,...
Time synchronization is an important challenge for femtocell design. An inaccurate clock can introduce interference, degrade spectrum accuracy and disrupt handovers. Among the potential solutions, wireless network-based time synchronization turns out to be cost effective because no extra provisions are required to ensure synchronization even on a regular basis. In wireless networks, receiver-receiver...
In this paper, we propose a novel cross-layer framework, which includes a two-level resource management to efficiently allocate subchannels among cell BSs (at the super-frame level) and do resource scheduling (at frame level) among intra-cell users based on channel condition and QoS requirement, and a system-level call admission control. The coordination among a plurality of BSs in the OFDMA-based...
The increasing popularity of the femtocell concept has revamped the interest in dynamic interference coordination techniques for dense and uncoordinated deployments of low- power home base stations. One of the proposed schemes for 4G OFDMA femtocells is known as Autonomous Component Carrier Selection (ACCS). ACCS capitalizes on the carrier aggregation framework of LTE-Advanced to curb inter-cell interference...
With the increasing demands for high data rate applications with high quality of service in the next generation networks, OFDMA based femtocell technology is a promising solution for indoor coverage extension and network capacity boosting with its automatic and easy deployment features in contrast to the high CAPital EXpenditure (CAPEX) and OPerating EXpense (OPEX) investments for macrocell deployments...
This paper proposes an opportunistic power control (PC) algorithm to mitigate the aggregate interference (AGGI) from active femtocells in uplink transmission. Macrocell base station (BS) decides the interference allowance per femtocell and femtocell users then allocate their transmit power within the allowance to suppress the cross-tier interference in heterogeneous networks. The PC algorithm should...
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