Predicting Traffic Flow Size and Duration

Current networks suffer from poor traffic management that leads to traffic congestion, even when some parts of the network are still unused. In traditional networks each node decides how to forward traffic based only on local reachability knowledge in a setting where optimizing the cost and efficiency of the network is a complex task. Modern networking technologies like Software-Defined Networking (SDN) provide automation and programmability to Networks. In such networks control functions can be applied in a different manner to each specific traffic flow and a variety of traffic information can be gathered from several different sources. This dissertation studies the feasibility of an intelligent network that can predict traffic characteristics, when the first packets arrive. The goal is to know the duration and size of flow to improve scheduling, load balancing and routing capabilities. An OpenFlow application is implemented in an SDN Data Collecting Controller (DCC), that shows how the first few packets of a traffic flow can be gathered with scalability concerns and in a non-intrusive way. The use of different classifiers such as Random Forest, Naive Bayes, Support Vector Machines, Multi-layer Perceptron and K-Neighbour for effective flow duration and size classification is studied. The results of using each of these classifiers to predict flow size and duration using the DCC gathered data are presented and compared

Ffau—framework for fully autonomous uavs

Nr. 024539 (POCI-01-0247-FEDER-024539) under grant agreement No 783221 UID/EEA/00066/2019Unmanned Aerial Vehicles (UAVs), although hardly a new technology, have recently gained a prominent role in many industries being widely used not only among enthusiastic consumers, but also in high demanding professional situations, and will have a massive societal impact over the coming years. However, the operation of UAVs is fraught with serious safety risks, such as collisions with dynamic obstacles (birds, other UAVs, or randomly thrown objects). These collision scenarios are complex to analyze in real-time, sometimes being computationally impossible to solve with existing State of the Art (SoA) algorithms, making the use of UAVs an operational hazard and therefore significantly reducing their commercial applicability in urban environments. In this work, a conceptual framework for both stand-alone and swarm (networked) UAVs is introduced, with a focus on the architectural requirements of the collision avoidance subsystem to achieve acceptable levels of safety and reliability. The SoA principles for collision avoidance against stationary objects are reviewed and a novel approach is described, using deep learning techniques to solve the computational intensive problem of real-time collision avoidance with dynamic objects. The proposed framework includes a web-interface allowing the full control of UAVs as remote clients with a supervisor cloud-based platform. The feasibility of the proposed approach was demonstrated through experimental tests using a UAV, developed from scratch using the proposed framework. Test flight results are presented for an autonomous UAV monitored from multiple countries across the world.publishersversionpublishe

Reliable Capacity of A2G Drone Communications Using 5G NR

Publisher Copyright: © 2023, The Author(s), under exclusive license to Springer Nature Switzerland AG.This chapter analyses the suitability of unmanned aerial vehicles (UAVs) communications for providing reliable communications using the fifth generation (5G) cellular networks new radio (NR) interface. The air-to-ground channel model on a rural scenario is considered using MIMO 2 × 8 and the maximum transmission power specified for a 5G terminal. The capacity, coverage range and UAV positioning that allow providing reliable communications with a guaranteed block error rate below 1% and a 99% guaranteed throughput are calculated and are compared to the scenario where reliability is not required. It is shown that the coverage and UAV possible horizontal distances and heights are reduced because a minimum SNR is required for reliable operation, compared to a pure throughput maximization approach. It is also shown a significant influence of the UAV height on the service provided and that increasing the throughput using more channel bandwidth reduces the coverage range.authorsversionpublishe