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Licensed-assisted access (LAA) is a feature of Long-Term Evolution (LTE) which enables operation in the unlicensed spectrum. LAA guarantees fair coexistence with Wi-Fi by implementing the listen- before-talk (LBT) mechanism. In this paper, we leverage stochastic geometry to characterize key performance metrics of neighboring LAA and Wi-Fi networks. Our analysis is focused on a single unlicensed frequency...
We report on the development of optical wireless arrays composed of multiple electrically interconnected optical modules (i.e., elements) forming a flat or curved terminal that is inexpensive, lightweight, and easy-to-assemble. The technology enables economic access to wide field-of-view optical communication for last-mile broadband connectivity. The smart modules provide reconfigurability, as well...
This paper investigates the station (STA)-access point (AP) association and airtime control for virtualized 802.11 networks to provide service customization and fairness across multiple Internet service-providers (ISPs) sharing the common physical infrastructure and network capacity. More specifically, an optimization problem is formulated on the STAs' transmission probabilities to maximize the overall...
Nowadays, mobile terminals have the ability to connect to several access networks at the same time. In an IoT scenario, it is important that all technologies be available simultaneously to transfer the information between all (users, sensors, vehicles) and the infrastructure. This paper proposes the use of machine learning to gather accurate network information in a real multihoming environment. It...
Traditional fronthaul (FH) solutions are not efficient and scalable enough to enable large-scale Cloud RAN deployment and to support 5G evolutions. In this paper we proposed a new fronthaul interface call Next Generation Fronthaul Interface (NGFI). The design principles of the NGFI are described including decoupling the FH bandwidth from the number of antennae, decoupling cell and user equipment processing...
This paper proposes a novel data detection scheme based on the occurrence of blurred output images in image- sensor-based visible light communication systems. This system's receiver suffers from an inability to detect correct LED luminance values and demodulation of data because the captured image blurs owing to defocusing. The proposed method assumes that the light emitted by all LEDs that is diffused...
With the shift towards decoupling of data and control plane and the softwarization in mobile networks, delivery of mobile network control functionalities can be foreseen as over the top services. We envisage such move within the paradigm of Functionality as a Service (FaaS); a platform that can also deliver requirements of the 5th generation mobile, i.e. 5G. In this paper, we briefly explain architectural...
Configuring uplink-downlink frame structure has played an important role in TD-LTE Heterogeneous Cellular Networks (HCNs), but how to dynamically choose the specific TD-LTE frame structure under the densely deployed scenarios has not been well investigated. In this paper, we proposed a novel dynamic frame configuration scheme which could resolve the above problem with low complexity. Specifically,...
Nowadays wireless communications still lack the ability to provide high reliability and low latency, although mission-critical applications, such as found in industrial automation, rely on both requirements. The main challenge is that an improved reliability often comes at the price of an increased latency. It has been shown that cooperative schemes can effectively increase the reliability by leveraging...
Interference coordination in heterogeneous cellular networks is a major bottleneck. In LTE-A (release 10), enhanced inter cell interference coordination (eICIC) scheme is proposed as an effective solution. It notably involves the approach of almost blank subframes (ABS) consisting of muting the macro cell during a set of predefined subframes. This offers the opportunity to the overlay small cells...
In this paper, an optical orthogonal frequency di- vision multiplexing (OFDM) system based on a single-photon avalanche diode (SPAD) receiver with a nonlinear distortion is presented. In this study, the methods to calculate the output of passive and active quenching SPAD arrays are given. Nonlinear performances of these two SPAD arrays and their effects on bit-error ratio performances of SPAD-based...
This paper proposes a scalable model based on hyper- graph representation for the evaluation of the cooperation between sensor nodes for a reliable node discovery. In the model a set of sensors participates in a single hyper-edge including multiple sensors that work together resulting in the decrease in discovery costs. The proposed model covers well the dynamics of the complex sensor network, such...
This paper proposes a new random access Medium Access Control (MAC) protocol, named as Full-duplex Multipacket reception Medium Access Control (FM-MAC), which jointly uses In-band Full-Duplex (FDX) and MultiPacket Reception (MPR) techniques. The protocol was designed to maximize the spectral efficiency by combining the FDX doubling potential and the MPR capability to handle interference due to concurrent...
Abstract-In this paper, we consider a mixed RF and hybrid RF/FSO system where several mobile users transmit their data over an RF link to a relay node (e.g. a small cell base station) and the relay forwards the information to a destination (e.g. a macro cell base station) over a hybrid RF/FSO backhaul link. The relay and the destination employ multiple antennas for transmission and reception over...
Mobility support is one of the key use cases of Information-Centric Networking (ICN), and is also widely discussed as a potential advantage of ICN compared to IP. In this paper, we review the state-of- the-art solutions for supporting producer mobility in ICN networks. Through deep analysis of the procedures for handling pending Interests, we observe two issues in the previous mobility solutions,...
This paper surveys the literature to reveal the communication patterns associated with cloud computing. The literature includes a number of studies that although are not specific to cloud computing do provide insight into one class of communication for cloud computing: the communication between cloud clients (CCs) and cloud service provider (CSP) facilities. In addition, a few studies focus on the...
Data framing attacks against linear state estimation was first proposed by Kim et. al. in 2014. Such attack is very interesting since it can mislead the control centre and "help" remove the measurements without malicious data. However, as the nonlinear state estimator is more widely used (than linear state estimator) in industry today, the nonlinear system cannot be simply analyzed with...
We propose a secure transmission scheme for a relay wiretap channel, where a source communicates with a destination via a decode-and- forward relay in the presence of spatially random- distributed eavesdroppers. We assume that the source is equipped with multiple antennas, whereas the relay, the destination, and the eavesdroppers are equipped with a single antenna each. In the proposed scheme, in...
The secrecy capacity of compound wiretap channels is studied. Using the known lower bounds for non-degraded discrete memoryless channels and establishing the converse, the secrecy capacity is established under the less capable and noisier conditions. The compound capacity is shown to be equal to the worst-case channel capacity when there exists a saddle- point in the mutual information difference...
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