Electricity production and distribution is facing two major changes. First, production is shifting from classical energy sources such as coal and nuclear power toward renewable resources such as solar and wind. Second, consumption in the low voltage grid is expected to grow significantly due to the expected introduction of electrical vehicles. Thus, with the increasing penetration of distributed energy resources, the smart grid needs more and deeper monitoring and control to maintain stable operation. In this paper, we proposed advanced measurement devices, management framework, and secure communication infrastructure, which allows full observability of the energy flows in the distribution grid. Furthermore, using proposed infrastructure, the prosumers are able to participate pro-actively and coordinate with the distribution system operator and other stakeholders in the grid. This paper presents novel solutions and analyses of these aspects for the real testbed (Elektro Primorska region) scenario, where smart grid ICT solutions are provided through shared cellular LTE networks. Specifically, we highlighted the security and communication requirements such as, e.g., end-to-end security, dynamic credential distribution, and highly reliable low latency communication.
COBISS.SI-ID: 30453031
5G machine type communication (MTC) networks will be formed of dense, heterogeneous clusters of wireless devices serving different applications verticals such as urban service enablers, body area networks, industrial and home automation, entertainment, etc. They will use a large number of existing and emerging wireless technologies served by advanced 5G gateways or eNodeB IoT and controlled through software interfaces by control and application programs, reducing the need for on site, manual reconfigurations. In this paper, we focus on the software interfaces that enable the control of 5G MTC networks and propose a functional split in upstream and downstream functions. We provide a reference implementation using RESTful functionality and an example control application that performs radio localization.
COBISS.SI-ID: 30593831
The contribution presents a novel model for prediction of site diversity system performance in millimeter-wave satellite communications. The model predicts the joint exceedance probability of rain attenuation based on a new family of Archimedean copulas, called the Hyperbolic Cosecant Copula. The proposed methodology can be used also for the prediction of joint first order statistics of rain attenuation for dual and multiple site diversity systems. Moreover, in addition to the common approaches, where the dependency of rain attenuation induced on multiple links is based solely on the distance between ground stations, elevation and baseline angle are also taken into account for the modeling of the dependence parameter. Tests have been performed on an extensive dataset of site diversity experiments with various system configurations and it is shown that the proposed model outperforms the the ITU-R Recommendation P.618-12 as well as the state-of-the-art models such as the models based on the Archimedean Clayton Copula and the Gaussian Copula.
COBISS.SI-ID: 30651175
In this paper, the influence of typical objects to the mmWave propagation channel are analysed for different railway scenarios with various configurations. Propagation measurements are conducted in the mmWave band for the 12 most common railway materials. The corresponding electromagnetic parameters are obtained and a 3D ray tracing (RT) simulator is calibrated. Results indicate that the calibrated RT can be used to generate the close-to-real mmWave channel for railway scenarios. The influence of typical objects and corresponding material compositions are also compared and significant objects are determined for each scenario. The results of this work not only imply how the propagation environment impacts on the propagation channel, but also makes suggestions to efficiently reconstruct railway environment models for an accurate RT based channel model.
COBISS.SI-ID: 30993447
We have developed a methodology that guides researchers in the process of developing effective machine-type communication (MTC) wireless systems with the devices that have restricted capabilities. It enables experimental evaluation and replication of the existing theoretical results. The methodology consists of six sequential steps, namely, (i) formulation of the discrete problem, (ii) development of the theoretical formalism, (iii) design of the algorithm, (iv) definition of evaluation criteria, (v) definition of the experimental set-up and (vi) performance of experimental evaluation. As a case study of using the proposed methodology, we present the development and evaluation of an efficient interference mitigation systems using devices that support only discrete transmit power levels.
COBISS.SI-ID: 30267943