Showing papers by "Md. Farhad Hossain published in 2016"

Energy cooperation among BS with hybrid power supply for DPS CoMP based cellular networks

Abstract: Green cellular networking has drawn intensive attention recently for cellular operators in order to reduce the network operation cost and carbon footprints. In this paper, we consider base stations (BSs) powered by hybrid power supplies including both the conventional grid and the renewable solar energy. We propose a model for energy cooperation among BSs having individual energy storages which are connected through resistive power lines for energy sharing. Furthermore, dynamic point selection (DPS) CoMP technique is applied for selecting the best serving BS for users equipment (UE). Our goal is to maximize the green energy utilization leading to higher energy efficiency. Tempo-spatial variations of both the renewable energy generation and the traffic demand are exploited for the proposed BS cooperation. Extensive simulations are carried out for evaluating energy efficiency (EE) performance of the proposed cellular network in conjunction with DPS CoMP technique and energy sharing scheme. From simulation results we investigate the benefits of energy cooperation and effectiveness of CoMP technique in this regime.

Energy efficient BS Cooperation in DPS CoMP based cellular networks with hybrid power supply

Abstract: Energy efficient cellular networking has recently drawn increasing attention for reducing network operation cost without sacrificing the quality of service (QoS). This paper proposes a framework for energy cooperation among base stations (BSs) in coordinated multi-point (CoMP) transmission based cellular networks, where the BSs are powered by hybrid power supplies including both the conventional grid and renewable energy sources. The considered network deploys BSs having independent energy storages, which are assumed interconnected by resistive power lines for energy sharing. The network also integrates dynamic point selection (DPS) CoMP technique for selecting the best serving BSs for an user equipment. The objective of the proposed cooperation is to maximize the usage of renewable solar energy leading to reduced on-grid power consumption. The proposed energy cooperation among BSs exploits the tempo-spatial diversities of both the renewable energy generation and the traffic demand. Monte Carlo based simulations are carried out for analyzing the energy efficiency (EE) performance of the proposed network. Simulation results validate the proposed inter-BS cooperation demonstrating substantial energy savings.

Three dimensional (3D) underwater sensor network architectures for intruder localization using EM wave

Abstract: Acoustic, wave based underwater wireless sensor networks (UWSNs), commonly used for underwater surveillance and explorations, fail to meet the growing demand for fast detection and higher data rates. Electromagnetic (EM) wave based underwater networks; on the other hand, have great potential for supporting such stringent requirements for various applications. Therefore, this paper proposes and investigates several three dimensional (3D) cluster-based UWSN architectures for detecting underwater intruders. The proposed architectures consisting of sensor nodes (SNs) and cluster heads (CHs) detect an intruder within the network area and forward the necessary information to an onshore base station (BS) for estimating the 3D location of the intruder. All communications from SNs to BSs are of EM wave based. Information of received EM signal power, and the location of SNs and CHs are utilized for estimating the locations of intruders. Extensive simulations are carried out for evaluating the proposed network performance in a salty seawater environment. Localization accuracy is compared in terms of error in distance and direction estimations demonstrating performance gaps among the architectures.

Performance comparison of network layouts with mobile users under different resource scheduling techniques in downlink LTE

Abstract: LTE-A addresses the challenges of coverage block holes and increase in user density with new features, such as small cell and femto cell. Small cell can be an inexpensive substitute to macro cell in coverage depleted areas. In contrast, heterogeneous network using femto cells with its ubiquitous coverage, can deliver high-speed data. Resource scheduling algorithm has an important role in determining the overall system performance. Several schedulers are available whose performance ranges from maximizing UE throughput to achieving the best fairness. UE mobility significantly affects the performance of different network topologies and various scheduling algorithms. In this paper, we have evaluated and compared various LTE downlink performance parameters between small cell network and heterogeneous network to conclude which type of network deployment is best suited for mobile users and dense urban environment under different scheduling schemes.

Energy efficiency of combined DPS and JT CoMP technique in downlink LTE-A cellular networks

Abstract: Coordinated multi-point (CoMP) transmission introduced by long-term evolution-advanced (LTE-A) cellular systems has shown great promise for improving network spectral efficiency (SE). On the other hand, the ever increasing energy consumption in cellular systems has emerged as a major concern for the network operators. This paper proposes a novel CoMP technique for the downlink of two-tier heterogeneous LTE-A cellular networks and investigates its energy efficiency (EE) performance. The proposed CoMP technique combines both dynamic point selection (DPS) and joint transmission (JT) CoMP schemes for improving network SE. Thus, under the proposed CoMP technique, multiple transmitting base stations (BSs) selected dynamically from the available high-power macrocells and low-power small cells are coordinated for jointly serving a user. Various spatial distributions of small cells in the macrocell coverage area are considered. A Poisson distributed hard core point process (HCPP) is also used for maintaining a minimum distance between any two of the small cells. Extensive simulations are carried out for evaluating the EE performance of cellular networks deployed integrating the proposed CoMP technique. Network performance is also compared with that of non-COMP, only JT and only DPS transmission scheme based cellular networks.

Traffic-aware two-dimensional dynamic network provisioning for energy-efficient cellular systems

Abstract: Conventional peak-traffic-based provisioning of cellular mobile networks leads to a significant wastage of electrical energy. Therefore, we propose a novel traffic-aware two-dimensional dynamic network provisioning mechanism for enhancing the energy efficiency in orthogonal frequency division multiple access OFDMA-based cellular systems. Proposed scheme, named as joint dynamic sectorisation and switching of base station BS, adaptively provisions cellular access networks by switching the redundant BSs as well as sectors into sleep mode. Quality of service, namely, user data rate, service continuity and network coverage, is also maintained. Because of the high complexity of the formulated generalised energy optimisation problem, the two dimensions i.e. sector switching and BS switching are decoupled in time-domain into two sub-problems, each executing its own heuristically guided algorithm. Moreover, a novel exponentially weighted moving average EWMA-based load factor estimator is employed for reducing the occurrence of network provisioning. System performance is evaluated using extensive simulations demonstrating substantial energy savings. In addition, impact on the spectral efficiency and resource utilisation is presented. Effectiveness of joint dynamic sectorisation and switching of BS is further validated by comparing with the individual application of sectorisation and BS switching. Furthermore, for realistic traffic patterns, use of EWMA estimator achieves over 40% reduction in network provisioning events without compromising energy-saving performance. Copyright © 2014 John Wiley & Sons, Ltd.

A novel CoMP transmission mechanism for the downlink of LTE-A cellular networks

Abstract: Introduced by long-term evolution-advanced (LTE-A) cellular systems, coordinated multi-point (CoMP) transmission has shown remarkable aptitude for improving network performance. This paper proposes a novel CoMP technique for the downlink of two-tier heterogeneous LTE-A cellular networks. Thorough investigation is carried out to evaluate its performance in terms of total throughput, energy efficiency and outage probability. The effect of interference is also taken in to consideration in this regard. The proposed technique combines both dynamic point selection (DPS) and joint transmission (JT) CoMP schemes. Under the proposed CoMP technique, multiple transmitting base stations (BSs) selected dynamically from available macrocells and small cells coordinate to jointly serve a user. Extensive simulations are carried out for evaluating the performance of cellular networks integrating the proposed CoMP technique and also compared with that of non-CoMP, only JT and only DPS based schemes.

On TDMA based hybrid channel MAC protocol for Underwater Sensor Networks

Abstract: Underwater sensor networks play a great role in research areas by gathering knowledge about the inaccessible parts of the underwater. The sensory nodes in the network aid us by performing real time data acquisition which is needed to forecast different natural calamities. However communication in underwater with high success rate is quiet challenging because of the nature of the environment. Due to the high attenuation of EM wave in water, large amount of power is needed to communicate with EM waves. Therefore acoustic waves are mainly used for underwater communication. However, the combination of the EM and acoustic waves can be a better choice for that purpose. Here we have proposed a combination of both the EM and acoustic waves for our MAC protocol. The model uses the EM in the control channel whereas the acoustic wave carries the data. The control channel uses TDMA to avoid any control packet collision and thus making sure that no data packet collision will occur. To our best knowledge this type of proposal with EM wave has not yet been stated anywhere else. The simulation results show that the proposed scheme achieves higher throughput than other MAC schemes examined in this paper.

Downlink analysis of cellular networks with distributed antenna systems for non-uniform user distribution using stochastic geometry

Abstract: Distributed antenna system (DAS), consisting of multiple antenna elements (AEs) serving a single base station (BS), is a promising scheme for long term evolution (LTE) cellular systems. In various studies, DAS based networks with uniformly distributed users have been shown to yield higher capacity and reliability. However, to the best of our knowledge, non-uniform user distribution has not been taken into account in previous research on DAS. In light of this, this paper proposes and investigates various network layouts incorporating DASs, including uniform and non-uniformly distributed AEs and BSs. Both homogeneous and inhomogeneous Poisson Point Process (PPP) are utilized for modeling the locations of users, AEs and BSs. Performance of the proposed network layouts are evaluated in terms of downlink signal-to-interference-plus-noise-ratio (SINR) and outage probability using extensive Monte Carlo simulations. Comparison of these metrics with those of the conventional uniformly distributed AEs demonstrates the superiority of the proposed non-uniform deployment of network elements.

Moving averaging method of RSSI based distance estimation for wireless capsule localization

Abstract: In this paper, we propose an efficient method of distance estimation for the localization of wireless capsule endoscope (WCE) using received signal strength indicator (RSSI). As RSSI is attenuated with change of distance, we can use RSSI measurements to estimate the distance. The main challenge in wireless capsule localization in the gastrointestinal (GI) tract is the random deviation in RSSI measurements due to the shadowing and multi-path propagation effects of non-homogeneous medium. In this paper, we propose a method of distance estimation which can improve the accuracy of wireless capsule localization. To address the randomness issue of RSSI measurements, we propose moving averaging method of path loss to estimate the distance of the swallowed capsule. We simulate our proposed method using MATLAB and observe significant improvement in distance estimation of the capsule considering non-homogeneous environment of human body.