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An uplink scheduler in the Long Term Evolution (LTE) network has the objective to improve the radio resources utilization in the network. The choice of uplink scheduling procedure used impacts the throughputs of individual users, as well as the overall throughput of the cell. This paper evaluates and compares the performance of three well-known LTE uplink schedulers (namely, Maximum Throughput (MT),...
Low power and lossy networks (LLNs) consist of devices having limited battery power, less memory, reduced processing capability. RPL (Routing Protocol for low power and Lossy networks), is an approved Internet Engineering Task Force (IETF) standard routing protocol for IPv6-based LLNs. RPL uses a proactive routing approach and the sink or controller node within the network creates a Directed Acyclic...
Underwater Acoustic Sensor Networks are considered to provide efficient monitoring tasks in aquatic environment but due to limited battery resource of sensor nodes, network lifetime collapses. Energy balancing is the major issue in low network lifetime. High energy consumption creates energy holes and ultimately leads to shorter network lifetime. Therefore, energy consumption must be balanced to increase...
As new congestion control mechanisms are developed, their performance relative to existing mechanisms needs to be understood, in particular over wireless networks. This study aimed to evaluate existing TCP congestion control mechanisms using a comprehensive and reproducible methodology designed to be representative of real world usage of wireless networks. The study sought to investigate whether any...
In this paper we assess the benefit of WiFi offloading over dense urban scenarios in terms of both Quality of Service (QoS) and Electromagnetic Field (EMF) exposure. This study relies on results obtained with two complementary simulation platforms: a two-tier dynamic system-level simulator and a 3D coverage-based simulator. Outputs are usual service coverage key performance indicators, handover probability...
This paper presents a method of calculating the minimal required transmission period for control messages and power margin for MANET with constrained resources, namely for communication and control systems on-planet robotic systems. For a system with ten robotic devices, with velocities of 10 cm/s, the sufficient power margin for worst case scenario will be equal to dP = 1 dB, which gives a transmission...
Upcoming standards are moving towards multi-antenna multiple-input multiple-output (MIMO) transmission techniques to harness the benefits of spatial degrees of freedom (DoF) in addition to the conventional time and frequency resources. Even though single user MIMO transmission improves the throughput noticeably, multiplexing different user data streams across the spatial dimension as in multi-user...
In multi-tier cellular/small cell networks, decoupled uplink-downlink association (DUDe) enables a user to be associated with different base stations (BSs) for uplink (UL) and downlink (DL) transmissions. In this paper, we consider the overall UL and DL rate maximization problem of the users in such a network with a provisioning for decoupled association. In particular, we formulate the UL and DL...
In this paper, we analyze the performance of a dense small cell network with multi-antenna Base Station (BS)s employing spatial Poisson Point Process (PPP) model. In this model, the BSs and User Equipment (UE)s are distributed as two independent PPPs which are well appropriate for upcoming small cells in the next generation of wireless systems. We consider the scenario in which the small cell BSs...
Heterogeneous Wireless Mesh Networks (HetMesh) is a promising high throughput technology for multi-hop data forwarding by mobile clients and backbone routers in a dynamic environment. HetMesh supports Wifi-Direct facility and other separate access technologies in its mobile clients, which makes the selection of a suitable next hop forwarder for data transmission challenging. This paper proposes a...
Cognitive radio network (CRN) is a 5-G future technology which is helpful to mitigate band width crises. There are several factors that are responsible to improve CRN quality such as modulation, routing protocols, and transmission power, etc. In this paper, we have analyzed various modulation techniques like QPSK, QAM-16, & QAM-64, and shown that QAM-64 modulation scheme performs well in terms...
This paper exploits the fundamental connection between cell association and load in the sense of bits-per-joule energy efficiency. Users adopt a proposed energy- efficiency-based association reward function to associate with their base stations in a heterogeneous cellular network consisting of K independent Poisson point processes (PPPs) of base stations (BSs). We first investigate the cell association...
In multi-tier cellular/small cell networks, user performance is largely affected by the varying transmit powers, distances, and non- uniform traffic loads of different BSs in both the downlink (DL) and uplink (UL) directions of transmission. To optimize user performance in such networks, decoupled UL-DL association (DUDe) has recently been investigated. DUDe enables a user to be associated with different...
Results and lessons learned from the implementation of a novel ultra low-latency geo-routing scheme are presented in this paper. The geo-routing scheme is intended for team-based mobile systems whereby a cluster of unmanned autonomous vehicles are deployed to accomplish a critical mission under human supervision. The contention-free nature of the developed scheme lends itself to jointly achieve lower...
Intelligent data analysis has become more important in the last decade especially because of the significant increase in the size and availability of data. In this paper, we focus on the common execution models and characteristics of iterative graph analytics applications. We show that the features that improve work efficiency can lead to significant overheads on existing systems. We identify the...
The new standard for narrowband PLC-based communications IEEE P1901.2 defines two mechanisms which do not exist in the majority of its wireless counterparts — dynamic frequency mapping (tone mapping), and existence of several modulations. Until now, the benefit of these mechanisms was not taken explicitly into account by the routing protocols. In this paper, we propose a novel metric for RPL — the...
In the Software Defined Network (SDN) ecosystem, the controller remains the cornerstone of the architecture and the critical point of its success. That is why performance concerns have existed throughout the history of SDN and controller development. This paper aims at making a reality check on the current performance achieved by mainstream open source controllers. The measurements are carried out...
Cloud platform providers usually offer several APIs (Application Program Interface) to help facilitate programmers to utilize cloud resources effectively by hiding complex cloud structures and mechanisms. However, there are some aspects of distributed computing that cannot be hidden. Depending on data consistency models, two or more clients may not see the same current state of the data. Developers...
User satisfaction is a critical design metric of wireless communications systems and networks. In this paper, we consider user satisfaction of wireless communications networks from a human psychological point of view through the prospect theory. Due to the asymmetrical s-shaped value function and the dependence of reference point described by the prospect theory, user satisfaction is degraded significantly...
While transistor density continues to increase according to Moore's law, Dennard scaling ruling the downsizing of transistor power has broken down due to the increasing rise of leakage occurring in submicron technologies. With every process generation the speed at which transistors can be switched is increasingly exceeding the capacity to dissipate the generated heat, fact that demands highly energy-efficient...
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