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Future mobile networks are known to deploy a two-tier architecture of macrocell — femtocell [1]. In the two-tier architecture, femtocell downlink channels can cause strong co-channel interference to downlink transmission of macrocell users (MUs) which use the same frequency. The co-channel downlink interference to the MU might cause the MU's QoS degradation. To maintain the QoS of the MU's connection,...
Direct Device-to-Device (D2D) communication permits to offload the network, increase the capacity, and extend the cellular coverage. In D2D systems, user equipments (UEs) do not necessarily communicate via evolved Node Base station (eNB); instead, they are allowed to communicate directly with each other. This underlying communication generates interference due to reusing the same resources of the...
Traditional power allocation algorithms in heterogeneous networks (HeNets) are given under the assumption of perfect channel state information (CSI). However, the perfect CSI is difficult to obtain due to the efficiency of channel fading and feedback delays. In this paper, a robust power allocation algorithm is proposed to minimize the total transmit power of femtocell users under the constraints...
Small cells are low-powered cellular radio access nodes which make best use of available spectrum by reusing the same frequencies many times within a geographical area. However, the deployment of small cells (e.g., femtocells) may introduce extra interferences such as cross-tier(macrocellfemtocell) and co-tier (femtocell-femtocell) interferences. In this regard, an effective interference management...
In this paper, we consider a heterogeneous cellular network with a macrocell and several femtocells. In each femtocell, the femto base station (FBS) serves one femto user (FU), which is capable of simultaneous wireless information and power transfer (SWIPT) energy harvesting (EH) in a power splitting manner. All FBSs suppress their interference to macro users (MUs) via a interference power constraint...
A decentralized power adjustment scheme based on non-cooperative game theory in a dense heterogeneous femtocell network is studied. Transmission power of the femtocell base stations are adjusted independently in a self-organizing manner to maximize the corresponding utility function, which consists of the signal-to-interference plus noise ratio and the transmission power of the femtocell base stations...
Femtocell is a small cell of 10–30 meters radius deployed in the existing larger cell (macrocell) forming two-tier femtocell-macrocell cellular network. However, the deployment of femtocell into the existing macrocell cellular network is facing more complex interference problems. This paper focuses on interference management using power control methods for the uplink transmission of such two-tier...
Deployment of femtocell in macrocell cellular network which forms two-tier femtocell-macrocell cellular network faces more complicated interference problems, since it uses the same licensed frequency spectrum as its macrocell. This paper addresses the interference problems for downlink transmission in such two-tier cellular communication network. In this paper, interference management using power...
In this paper, we jointly perform the cell selection and activation (CSA) to maximize the network energy efficiency (EE) under users' long-term rate constraints for green communications in ultra-dense heterogeneous networks (UD-HetNets). The finally formulated problem is in a mixed-integer fractional form and hard to tackle. We first transform it into a parametric subtractive form, by which we reach...
Heterogeneous Networks (HetNets) are being considered a promising way to significantly boost the overall spectral efficiency by using spectrum-sharing scheme to deploy femto base stations (FBSs) within a macrocell network. However, the co-channel deployment also brings a severe problem of interference containing intra-tier interference among FBSs and inter-tier interference between FBSs and the macro...
HetNets have attracted many attentions these last five years, as they are a promising solution to improve network capacity and indoor coverage. In these emerging networks, technical challenges remain, principally user mobility management through handover decision. Consequently, we propose a novel utility-based handover algorithm to improve the performance of the mobility management in a two-tier network,...
For heterogeneous network, which has been deployed by 4G systems in a small scale and is viewed as one pioneering technology for making cellular networks be evolved into 5G systems, more efficiently achieving load balance between Macrocells and small cells has attracted increasing attention. Specifically, when Macrocells and Picocells use the completely same frequency spectrum resource, range extension...
Smallcells have great potential to enhance cellular networks, complementing macrocells. Severe interference may occur, as smallcells are expected to be deployed and operated uncoordinatedly. However, existing resource management methods require significant overhead to suppress interference. We propose a new resource management approach which is able to mitigate the cross-tier and co-tier interference...
In this paper, we investigate the problem of pilot optimization, resource allocation, and user association in a massive MIMO heterogeneous network (HetNet) with wireless backhaul (WB) and linear processing. The objective is to maximize the sum downlink rate of all users, subject to constraints on data rate of WB and fairness-aware constraints. Such a problem is formulated as an integer programming...
Long term evolution-advanced (LTE-A) supports high-speed communications for cellular systems. It allows different types of base stations to form a heterogeneous network to provide service. However, signal interference between a macrocell and its picocells is inevitable. Thus, LTE-A adopts enhanced intercell interference coordination (eICIC) to conquer the interference problem. In the time-domain eICIC...
The heterogeneous deployment of ultra dense small cells such as femtocells in the coverage area of the traditional macrocells is seen as a cost-efficient solution to provide network capacity, indoor coverage and green communications towards sustainable environments in the fifth generation wireless network. However, the unplanned and ultra-dense deployment of femtocells will lead to increase in total...
In the fifth generation wireless networks, the heterogeneous deployment of ultra-dense small cells such as femtocells is seen as a major solution to cope with the exponential traffic growth and to improve coverage especially in indoor environments. However, the unplanned and ultra-dense deployment of femtocells in the coverage area of conventional macrocells introduces new challenges such as cross-tier...
Recent development of wireless communications has resulted to the augmentation of small cell to traditional macrocell networks. This constitutes an improved coverage and system capacity of the networks. However, it consequently results to interference and high blockage rate, which are the problems we are treating in this paper. This work proposes two cell selection schemes that adopt the enhanced...
Interference management (IM) is essential to wireless communication networks, but interference suppression, a key component of IM, is known to degrade users' achievable spectral efficiency (SE). It is thus important to select an appropriate IM method with optimal operating parameters according to diverse network deployments, transmit power differences of various communication equipments, and dynamically...
How to improve system capacity and spectral efficiency is a key issue for next generation wireless communication. Heterogeneous network (HetNet) has been considered as a new promising technique for enhancing the quality of service and spectrum efficiency due to different radio access technology and network structures. However, conventional resource allocation algorithms in HetNets are achieved under...
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