scholarly journals Inter-cell Interference Management Technique for Multi-Cell LTE-A Network

2017 ◽  
Vol 7 (5) ◽  
pp. 2696
Author(s):  
Iskandar Iskandar ◽  
I. Setyawan ◽  
H. Nuraini
Keyword(s):  
Interference Management ◽  
High Capacity ◽  
Frequency Reuse ◽  
Spectrum Efficiency ◽  
Management Technique ◽  
Single Input Single Output ◽  
Downlink Transmission ◽  
Cell Edge ◽  
Single Output ◽  
Inter Cell Interference

In modern cellular system such as LTE Advanced (LTE-A), frequency reuse scheme is targeted to be applied to fulfill the requirement of high capacity broadband access and high spectrum efficiency. But this kind of frequency planning may lead to the worse inter-cell interference (ICI) level experienced especially by a user located at the cell edge. Soft Frequency Reuse (SFR) is considered as an effective way to mitigate inter-cell interference and maintain capacity. We propose a power division SFR, known as multi level SFR technique to minimize ICI in a designed LTE-A network for sub-urban environment. Service area of LTE-A network was first developed to deploy particular number of eNB by using LTE network planning tools in the frequency of 1800 MHz with the use of SISO (Single Input Single Output) antennas. Coverage dimensioning and propagation consideration determine LTE-A parameters which were used in the simulation. Monte carlo simulation is executed to examine the performance of SFR for LTE-A downlink transmission to address different power ratio and traffic loads problem. Both performance of cell edge users and overall cell performance are evaluated in terms of CINR, BLER, and throughput. Performance with SFR is also compared with the classical frequency reuse one and three.

scholarly journals Network Optimization Using Femtocell Deployment at Macrocell Edge in Cognitive Environment

2021 ◽  
Author(s):  
Joydev Ghosh
Keyword(s):  
Base Station ◽  
Wall Structure ◽  
Matlab Simulation ◽  
Femtocell Networks ◽  
Single Input Single Output ◽  
Cell Edge ◽  
Single Output ◽  
Macro Cell ◽  
Performance Metric ◽  
Cognitive Environment

<div>This research focuses on the problem of cell edge user’s coverage in the context of femtocell networks operating within the locality of macrocell border where pathloss, shadowing, Rayleigh fading have been included into the environment. As macro cell edge users are located far-away from the macro base station (MBS), so that, the underprivileged users (cell edge users) get assisted by the cognitive-femto base station (FBS) to provide consistent quality of service (QoS). Considering various environment factors such as wall structure, number of walls, distance between MBS and users, interference effect (i.e., co-tier and cross-tier), we compute downlink (DL) throughput of femto user (FU) for single input single output (SISO) system over a particular sub-channel, but also based on spectrum allocation and power adaptation, performance</div><div>of two tier network is analyzed considering network coverage as the performance metric. Finally, the effectiveness of the scheme is verified by extensive matlab simulation.</div>

scholarly journals Throughput Analysis and Optimization of Multi-layer FFR-aided OFDMA Networks

2017 ◽  
Author(s):  
Jan Garcia-Morales ◽  
Guillem Femenias ◽  
Felip Riera-Palou
Keyword(s):  
Analytical Framework ◽  
Frequency Reuse ◽  
Fractional Frequency Reuse ◽  
Spectrum Utilization ◽  
Average Cell ◽  
Cell Edge ◽  
Mathematical Expressions ◽  
Inter Cell Interference ◽  
Very High ◽  
Ofdma Networks

In OFDMA networks, the use of universal frequency reuse plans improves cell capacity but causes very high levels of inter-cell interference (ICI), particularly affecting users located in the cell-edge regions.In order to mitigate ICI while achieving high spectral efficiencies, fractional frequency reuse (FFR) shows a good tradeoff between cell-edge throughput and overall cell spectral efficiency.Recently, multi-layer FFR-aided OFDMA-based designs, splitting the cell into inner, middle and outer layers have been proposed and studied with the aim of increasing the spectrum utilization and improving the user fairness throughout the cell.This paper presents an analytical framework allowing the performance evaluation and optimization of multi-layer FFR designs in OFDMA-based networks.Tractable mathematical expressions of the average cell throughput as well as the layer spectral efficiency have been derived for both proportional fair (PF) and round robin (RR) scheduling policies.

A Simulation Framework for the Evaluation of Frequency Reuse in LTE-A Systems

2014 ◽  
Vol 3 (2) ◽  
pp. 56-83 ◽  
Author(s):  
Dimitrios Bilios ◽  
Christos Bouras ◽  
Georgios Diles ◽  
Vasileios Kokkinos ◽  
Andreas Papazois ◽  
...  
Keyword(s):  
Mobile Communications ◽  
High Performance ◽  
Interference Mitigation ◽  
High Capacity ◽  
Frequency Reuse ◽  
Fractional Frequency Reuse ◽  
Simulation Framework ◽  
Power Efficient ◽  
Enhance Efficiency ◽  
Inter Cell Interference

Long Term Evolution Advanced (LTE-A) technology is considered as the most possible candidate for next generation mobile communications. LTE-A networks offer high capacity and are specified and designed to accommodate small, high performance, power-efficient end-user devices. Similarly to its predecessor LTE, LTE-A incorporates inter-cell interference mitigation methods in order to mitigate interference and to enhance efficiency in bandwidth usage. These methods include power and frequency allocation schemes that allow neighbouring cells and femtocells in heterogeneous networks to co-ordinately share and reuse available spectral resources, in order to avoid performance degradation for interference suffering cell-edge users. In this paper, the authors study the LTE-A multi-cell systems' performance using a simulation framework, which integrates several frequency reuse techniques and provides a user-friendly graphical presentation of the evaluation results. The optimal Fractional Frequency Reuse (FFR) configuration for the user-defined network instance is also determined, based on overall performance and fairness index metrics. Finally, the authors examine FFR techniques in two-tier femtocell/macrocell environments and evaluate them based on the optimization of different metrics, depending on the network operator's needs.

scholarly journals Device to Device Hybridization in 5G and Beyond: A Literature Review

2021 ◽  
Vol 6 (4) ◽  
Author(s):  
Faisal Lawal ◽  
Aliyu D. Usman ◽  
Abdoulie M.S. Tekanyi ◽  
Hassan A. Abdulkarim ◽  
Abubakar L. Tanko
Keyword(s):  
Literature Review ◽  
Millimeter Wave ◽  
User Experience ◽  
Cellular Network ◽  
Mode Selection ◽  
Interference Management ◽  
Spectrum Efficiency ◽  
Device To Device ◽  
Wave Network ◽  
Inter Cell Interference

Abstract- Device-to-Device (D2D) communication is one of the most promising technologies to enhance user experience in 5G and beyond. Despite the huge benefit anticipated, enabling D2D in cellular network has encounter some challenges, these challenges include peer discovery and synchronization, mode selection and interference management. However, resolving these challenges promises improved service delivery, spectrum efficiency and reduced latency amongst other gains.  Attempts to enable D2D in both microwave and millimeter wave network gained some traction in recent years in a bid to enable wider coverage and utilization of the technology. Some of the research attempts, challenges and prosects are discussed in this paper.Keywords- Device-to-Device, Microwave, millimeter wave, Inter-cell Interference

scholarly journals Performance Improvement of Outage Users at Cell Edges Through Cognitive-Femtocell Deployment Over Macrocell Network

2021 ◽  
Author(s):  
Joydev Ghosh
Keyword(s):  
Base Station ◽  
Wall Structure ◽  
Femtocell Networks ◽  
Long Distance ◽  
Single Input Single Output ◽  
Cell Edge ◽  
Single Output ◽  
Macro Cell ◽  
User Coverage ◽  
Single Input

<div>This research focuses on the problem of cell edge user coverage in the context of femtocell networks operating within the locality of macrocell border. The macro cell-edge users get assisted by the cognitive-femto base station (FBS) to receive a consistent quality of service (QoS) because of their long distance from the macro base station (MBS). Considering various environment factors such as wall structure, number of walls, distance between macrocell and users, interference effect (i.e., co-tier and cross-tier), we compute not only the overall outage probability of single input single output (SISO) system and single input multiple output (SIMO) system users but also based on subcarrier and power allocation the performance of the two tier network is analysed with macrocell throughput as the performance metric. Finally, the effectiveness of the scheme is verified by extensive matlab simulation.</div>

scholarly journals An Active Power Control Technique for Downlink Interference Management in a Two-Tier Macro–Femto Network

Sensors ◽  
2019 ◽  
Vol 19 (9) ◽  
pp. 2015 ◽  
Author(s):  
Tehseen Ul Hassan ◽  
Fei Gao
Keyword(s):  
Power Control ◽  
Interference Mitigation ◽  
Interference Management ◽  
Active Power ◽  
User Equipment ◽  
Control Technique ◽  
Active Power Control ◽  
Downlink Transmission ◽  
High Data ◽  
Inter Cell Interference

The femtocell has evolved as a great solution for improving coverage and traffic offloading from the current LTE cellular networks, and it accomplishes the dreams of the high data rate for indoor mobile users. However, the exponentially expanding LTE femtocells cause interference in the network, as they share the same licensed spectrum with a macrocell. To tackle this issue, numerous interference mitigation techniques have been proposed in the literature. In this paper, we proposed an Active Power Control (APC) technique, which not only reduces Inter-Cell Interference (ICI) in a Macro User Equipment (MUE), generated from the downlink transmission power of an inadequately deployed femtocell, but also reduces unnecessary power consumption to achieve a green femtocell network. The simulation results show that the proposed APC technique effectively reduces ICI and optimizes the throughput performance of the MUE. Compared with the existing power control techniques, the APC technique provides a balanced trade-off in attaining necessary Quality-of-Service (QoS) of the Femto User Equipment (FUE) and reducing ICI to the victim MUE existing in the close proximity of the femtocell.

scholarly journals Study of Handover Techniques for 4G Network MIMO Systems

2021 ◽  
Vol 15 ◽  
pp. 10-16
Author(s):  
Jian-Sing Wang ◽  
Jeng-Shin Sheu
Keyword(s):  
Mimo Systems ◽  
Multiple Input Multiple Output ◽  
Cellular Systems ◽  
Frequency Reuse ◽  
Fractional Frequency Reuse ◽  
Cell Edge ◽  
Network Mimo ◽  
Input Multiple Output ◽  
Inter Cell Interference ◽  
4G Systems

For the upcoming 4G systems, network multiple-input multiple-output (MIMO) and inter-cell interference coordination (ICIC) are two of key techniques adopted in 4G systems to mitigate the serious inter-cell interference (ICI) and improve coverage and cell-edge throughput. Network MIMO is referred to as coordinated multi-point (CoMP) in LTE-A. In this paper, we propose a simulation platform to analyze the handover issue for downlink CoMP transmissions in LTE-A cellular systems. Among the variety of ICIC strategies, we apply the widely adopted soft frequency reuse (SFR) and the fractional frequency reuse (FFR) schemes. Both schemes are based on the idea of applying a frequency reuse factor of one in cell-center areas, and a higher reuse factor in cell-edge areas. Therefore, the ICI is reduced at the expense of the available frequency resources for each cell.

scholarly journals Performance Improvement of Outage Users at Cell Edges Through Cognitive-Femtocell Deployment Over Macrocell Network

2021 ◽  
Author(s):  
Joydev Ghosh
Keyword(s):  
Base Station ◽  
Wall Structure ◽  
Femtocell Networks ◽  
Long Distance ◽  
Single Input Single Output ◽  
Cell Edge ◽  
Single Output ◽  
Macro Cell ◽  
User Coverage ◽  
Single Input

<div>This research focuses on the problem of cell edge user coverage in the context of femtocell networks operating within the locality of macrocell border. The macro cell-edge users get assisted by the cognitive-femto base station (FBS) to receive a consistent quality of service (QoS) because of their long distance from the macro base station (MBS). Considering various environment factors such as wall structure, number of walls, distance between macrocell and users, interference effect (i.e., co-tier and cross-tier), we compute not only the overall outage probability of single input single output (SISO) system and single input multiple output (SIMO) system users but also based on subcarrier and power allocation the performance of the two tier network is analysed with macrocell throughput as the performance metric. Finally, the effectiveness of the scheme is verified by extensive matlab simulation.</div>

scholarly journals Soft Frequency Reuse (SFR) in LTE-A Heterogeneous Networks based upon Power Ratio Evaluation

2018 ◽  
Vol 8 (3) ◽  
pp. 1569
Author(s):  
Alvita Maurizka ◽  
F. Hamdani ◽  
M. M. Ulfah ◽  
Iskandar Iskandar
Keyword(s):  
User Experience ◽  
Heterogeneous Networks ◽  
Heterogeneous Network ◽  
Mobile Network ◽  
Frequency Reuse ◽  
Power Ratio ◽  
Traffic Demand ◽  
Cell Edge ◽  
Link Budget ◽  
Inter Cell Interference

As the traffic demand grows and the RF environment changes, the mobile network relies on techniques such as SFR in Heterogeneous Network (HetNet) to overcome capacity and link budget limitation to maintain user experience. Inter-Cell Interference (ICI) strongly affecting Signal-to-Interference plus Noise Ratio (SINR) of active UEs, especially cell-edge users, which leads to a significant degradation in the total throughput. In this paper we evaluate the performance of SFR with HetNet system in order dealing with interferences. Simulation result shows that the power ratio control in SFR HetNet system doesn’t have much effect on total achieved capacity for overall cell.

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