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The device-to-device (D2D) communications can improve the spectrum efficiency with low power and effectively offload the traffic from the macro-eNB. However, the macro/femto/D2D heterogeneous networks face a complicated three-tier interference issue. The completely centralized resource management is not applicable in such three-tier heterogeneous networks. Therefore, we propose a network-assisted...
Cognitive heterogeneous networks (HetNets) have been recently introduced as a promising solution to meet the user demand for higher data rate. Due to the physical coexistence of microcells, femtocells and the lack of available spectrum, there is a need for techniques that allows users to share the same spectrum while maintaining required performance level for each user by adopting interference mitigation...
In heterogeneous networks, a severe downlink interference from femtocells should be controlled centrally to increase the performance requirement of macrocell users. This paper proposes a power control mechanism for interference mitigation in a mobility environment where macrocells and femtocells are co-located together. The key benefits of this scheme is to achieve higher performance for non closed...
Rapid growth in provisioning of cellular data at low or same energy expenditure is one of the most significant objectives of Information and Communication Technology (ICT) division. The exponential growth of cellular data traffic affects not only the capacity requirements of the cellular networks, but also affects the quality of service. In order to fulfill the increasing demands in cellular communications,...
Femtocells are capable of achieving high capacity and improving indoor coverage due to a shorter distance between the transmitter and receiver, while fractional frequency reuse (FFR) has been proposed to improve spectral efficiency in emerging OFDMA networks. Due to spectrum limitations, FFR macrocell and femtocells are likely to share the same licensed spectrum, thereby inadvertently creating a possible...
Femtocells are a promising approach to provide high data rates through autonomous configuration in indoor environments. However, due to the random and uncontrolled deployment of femtocells within users premises, interference between femtocells themselves and with macrocell base stations is a major issue. In this work, we look into the interference management problem and work towards the development...
Femtocells are small, low-power, low-cost randomly deployed base stations, which are deployed by end users without proper cell planning or resource optimization. This ad-hoc deployment results in many technical issues that demand an effective solution to exploit the co-channel deployment with macro-cells. One typical problem is cross-tier interference especially at the cell edge where macro user equipments...
This paper proposes a self-optimizing based energy-efficient scheme with a dynamic coverage expansion of femtocells in the macro-femto two-tier networks. High SINR and low power consumption can be benefited by coordinating downlink cross-tier interference and intra-interference with a neuron control based adaptive power adjustment when sleep mode is involved in the macro base station (MBS). Moreover,...
Developments in autonomic network management offer many promises, but its economic benefits are hard to assess. This paper proposes a method to calculate the OPEX gains of a typical network on the basis of a scenario, for which a management framework and autonomous mechanisms have been developed. It makes use of a novel approach, a Toy model, taking into account expert opinions as well as simulation...
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