Data-driven research uses real-life data to gain insight about the behavior of systems. It enables the analysis of small, simple as well as large and more complex systems in order to assess whether they function according to the intended design and as seen in simulation. Wireless networks can exhibit unpredictable interactions between algorithms from multiple protocol layers, interactions between multiple devices, and hardware specific influences. These interactions can lead to a difference between real-world functioning and design time functioning. Data science methods can help to detect the actual behavior and possibly help to correct it. Data science is increasingly used in wireless research. To support data-driven research in wireless networks, this paper illustrates the step-by-step methodology that has to be applied to extract knowledge from raw wireless network data traces.
COBISS.SI-ID: 29528103
This contribution describes a novel rain attenuation time series synthesizer based on Gaussian Copula function. Firstly, the Gaussian copula is tested for the modeling of joint exceedance probability of rain attenuation on temporal domain with good results. Afterward taking advantage of the results from the previous tests, two expressions are proposed for the modeling of the Gaussian copula parameter as a function of time for temperate and tropical climatic regions. The synthesizer is based on the generation of time series from copula functions. It reproduces the first order statistics and it is independent of the distribution that may describe well the rain attenuation used as input. The synthesizer is validated on first order statistics, for no time delay and with time delay and on second order statistics.
COBISS.SI-ID: 29464359
The contribution describes the main outcomes of the ABSOLUTE project in terms of network and system architecture, regulations, and implementation of aerial base stations, portable land mobile units, satellite backhauling, S-MIM satellite messaging, and multimode user equipment. The ABSOLUTE project focused on designing, prototyping, and demonstrating a high-capacity IP mobile data network with low latency and large coverage suitable for many forms of multimedia delivery including public safety scenarios. The ABSOLUTE project combines aerial, terrestrial, and satellites communication networks for providing a robust standalone communication systems.
COBISS.SI-ID: 29534247
In the paper a novel prediction model of joint exceedance probability of rain attenuation in Earth-satellite site diversity systems based on Gaussian copula is presented. The proposed model is based on a number of experimental data of two-site diversity systems with different configurations. The proposed model outperforms the existing model for two-site diversity given in recommendation ITU-R P.618-12 and the recently presented model based on Clayton copula. The method is generalized to multiple-site diversity prediction. Results for a few existing three site diversity experiments are evaluated.
COBISS.SI-ID: 29464103
The contribution studies the implementation of the 5G concept in the emergency network deployments. In particular, the integration of multiple heterogeneous communication systems with the preserved part of the existing wireless infrastructure is studied and evaluated, based on the simultaneous use of the remaining terrestrial systems and additional low-altitude platforms. Simulations of the system were performed using the GRASS-RaPlaT tool, augmented with the AMS-DEMO tool for optimising a radio network configuration and based on a set of four criteria functions. Different scenarios are investigated for setting up the initial emergency network configuration that is primarily focused on providing the high coverage needed for emergency forces. This is followed by recovering the complete system with larger capacity and better quality of service. An application of 5G principles, such as carrier aggregation, has proved to be beneficial. The performance of the emergency network is evaluated in an actual geographic location of the city of Ljubljana and compared with the existing mobile network in this area. Based on the results, recommendations are given for the procedures needed to rebuild a mobile network after a disaster.
COBISS.SI-ID: 29794855