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Item type:Publication, Access status: without files , Simulating situational overview in large-scale UAS networks using demand driven mobility(IEEE, 2025-03); ; ; ; Recently, Rate Decay Flooding (RDF) has been proposed as a special-purpose protocol to facilitate network-wide information exchange in large-scale urban Unmanned Aircraft System (UAS) networks. Nevertheless, mobility is a crucial aspect determining the performance of these protocols. In this work, we use randomly generated city geometries and flight demands to simulate Demand Driven Mobility (DDM) that represents plausible trajectories for a package delivery scenario in urban areas. These trajectories are then fed into a network simulator to obtain realistic performance measurements of the proposed protocols. Furthermore, we compare the results to Random Direction Mobility (RDM) widely used in UAS communication research. We quantify the performance with the dissemination rate, which is a measure of how effectively information is distributed within the network. Our results show, that even if matched for area and number of UAS, the choice of mobility has a strong influence on the performance. For low density, DDM causes temporary UAS clusters to form around drone ports that are not connected to UAS on delivery flights to the outskirts of the city, which results in a more poorly connected network compared to RDM. In high-density scenarios, where traffic is highly concentrated around drone ports, UAS located between the drone ports have to carry high amounts of data between them.Publicationtype: Conference Paper63 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Design and evaluation of circular polarized antennas for UAS communication using C-V2XCellular vehicle-to-everything (C-V2X) is a technology originally developed for automotive applications. In recent years though, the C-V2X technology is considered also for Unmanned Aircraft System (UAS) communication purposes. However, the UAS scenarios significantly differ from typical road user scenarios, e.g. the communication between different UASs should be established in arbitrary directions and for larger distances, frequently exceeding 1 km. To achieve this, special-purpose antennas are required. In this paper the deployment of circular polarized (CP) slotted patch antennas for direct UAS-toUAS communication is addressed. Within the context of the German national funded project VEREDUS, the C-V2X communication technology at 5.9 GHz is deployed in order to establish a robust communication link between two different pairs of UAS types. Simulation and measurement results of the antenna matching and radiation patterns of the designed CP antennas in the UAS compartments will be shown. Last but not least, first evaluation results from actual air field tests, which depict the omnidirectional coverage characteristic of the antennas in the drones will be also provided.Publicationtype: Conference Paper39 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Design and implementation of a multi-link modem for future UAS networksProviding reliable communication services for Unmanned Aircraft Systems (UASs) is one of the remaining challenges hindering the deployment of large-scale UAS operations. In this paper, we describe the design and implementation of a multi-link modem developed to fulfill current and future communication needs. This modem combines LTE/5G with 868MHz based long-range communication, an Iridium satellite connection, and C-V2X to provide direct UAS to UAS communication with a low latency and a high data rate. To realize this, hardware components were selected and integrated into a communication stack. Custom software was developed to operate the hardware and intelligently utilize all available communication links. Real-world flight tests were conducted with the developed modems mounted on state-of-the art commercial UASs. In this work, we present an in-depth analysis of the performance of the direct C-V2X communication which is one of the proposed technologies for future UAS communication. Our results show that a communication range over 2km is achieved at an end-to-end delay of around 60ms.Publicationtype: Conference Paper42 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Unforeseen silly errors in network simulations and visualizations(IEEE, 2025-03); ; ; ; Accurate network simulations are essential for meaningful research. Factors like incorrect parameterization, unsuitable KPIs, or overlooking key aspects in design and modeling may result in misleading conclusions, time- and resource-waste. In this paper, we share our genuine experiences from working with bachelor's, master's and PhD students, with the focus on three scenarios where distinct simulation errors commonly occur. The first two scenarios highlight cases of unjustifiable results, leading to investigations that uncovered "silly errors"in randomization and visualization. The third scenario, though properly modeled, failed to capture the overall picture needed to reflect real-world outcomes. By sharing these lessons learned across experience levels using packet level network simulations, we aim to help students and researchers achieve more credible results while saving valuable time.Publicationtype: Conference Paper106