Ulf Wetzker's research while affiliated with Fraunhofer Institute for Integrated Circuits IIS and other places

Publications (15)

Article
Full-text available
Automated spectrum analysis serves as a troubleshooting tool that helps to diagnose faults in wireless networks such as difficult signal propagation conditions and coexisting wireless networks. It provides a higher monitoring coverage while requiring less expertise compared with manual spectrum analysis. In this paper, we introduce a data set that...
Preprint
p>Multivariate time series (MTS) are captured in a great variety of real-world applications. However, analysing and modelling the data for classification and forecasting purposes can become very challenging if values are missing in the data set. The need for imputation methods, to fill the gaps in MTS, is well known. Thus, a great variaty of algori...
Preprint
p>Multivariate time series (MTS) are captured in a great variety of real-world applications. However, analysing and modelling the data for classification and forecasting purposes can become very challenging if values are missing in the data set. The need for imputation methods, to fill the gaps in MTS, is well known. Thus, a great variaty of algori...
Preprint
Automated spectrum analysis serves as a troubleshooting tool that helps to diagnose faults in wireless networks like difficult signal propagation conditions and coexisting wireless networks. It provides a higher monitoring coverage while requiring less expertise compared to manual spectrum analysis. In this paper, we introduce a data set that can b...
Preprint
p>In this manuscript, we analyze the security offered by existing 802.11 protocols against one of the most basic yet detrimental Evil Twin (ET) attacks. To comprehensively protect Wi-Fi networks against such attacks, vulnerabilities in the IEEE 802.11 specifications were addressed by new and improved security mechanisms. Unfortunately, each of the...
Preprint
p>In this manuscript, we analyze the security offered by existing 802.11 protocols against one of the most basic yet detrimental Evil Twin (ET) attacks. To comprehensively protect Wi-Fi networks against such attacks, vulnerabilities in the IEEE 802.11 specifications were addressed by new and improved security mechanisms. Unfortunately, each of the...
Article
Full-text available
Smart manufacturing aims to overcome the limitations of today's rigid assembly lines by making the material flow and manufacturing process more flexible, versatile, and scalable. The main economic drivers are higher resource and cost efficiency as the manufacturers can more quickly adapt to changing market needs and also increase the lifespan of th...
Preprint
Full-text available
Smart manufacturing aims to overcome the limitations of today's rigid assembly lines by making the material flow and manufacturing process more flexible, versatile, and scalable. The main economic drivers are higher resource and cost efficiency as the manufacturers can more quickly adapt to changing market needs and also increase the lifespan of th...
Conference Paper
Full-text available
The ever-growing proliferation of wireless devices and technologies used for Internet of Things (IoT) applications, such as patient monitoring, military surveillance, and industrial automation and control, has created an increasing need for methods and tools for connectivity prediction, information flow monitoring, and failure analysis to increase...
Conference Paper
Full-text available
In this demonstration, we present a prototype of a cross-technology communication (CTC) system that allows a Bluetooth Low Energy (BLE) device to directly send data to a Wi-Fi device using commodity hardware. Towards this goal, we use energy burst patterns to encode information on overlapping channel frequencies. With this demonstration , we prove...
Poster
Full-text available
In this demonstration, we present a prototype of a cross- technology communication (CTC) system that allows a Bluetooth Low Energy (BLE) device to directly send data to a Wi-Fi device using commodity hardware. Towards this goal, we use energy burst patterns to encode information on overlapping channel frequencies. With this demonstration, we prove...
Conference Paper
Full-text available
The ever-growing proliferation of wireless devices and technologies used for Internet of Things (IoT) applications, such as patient monitoring, military surveillance, and industrial automation and control, has created an increasing need for methods and tools for connectivity prediction, information flow monitoring, and failure analysis to increase...
Conference Paper
Full-text available
The industrial wireless automation sector exhibits a huge market growth in the last years. Today, many appli-cations already use wireless technologies. However, the existing wireless solutions do not yet offer sufficient performance with respect to real-time and reliability requirements, particularly for closed-loop control applications. As a resul...
Conference Paper
Wireless solutions in industrial automation appli-cations must meet high requirements regarding reliability and latency. The preferred usage of the license-free 2.4 GHz ISM frequency band bears the risk of error-prone coexistence of various wireless networks within a production site and could result in system failures. This represents a significant...

Citations

... IEEE 802.15.1 based technologies are currently used in industrial plants such as chemical, oil-gas, water, and power, as a part of monitoring and maintenance solutions. Ease of deployment, wide availability, low-power and low cost makes Bluetooth a superior choice for sensing and device monitoring, which falls primarily under the predictive maintenance use case category discussed in Section 2. One example is in a motor assembly line that spans across 100 m × 500 m factory floor at Mercedes-Benz Ludwigsfelde GmbH (Germany), Bluetooth is used to connect cordless power tools to a central programmable logic controller (PLC) [53]. Other experimental works are described in the research literature, which presents the applicability of Bluetooth technology in the smart industry [54,55]. ...
... So far, the community has mostly focused on building prototypes showcasing the ability of carrying out CTC between diverse wireless standards and on highlighting potential applications [2], [8], [17]. Such proof-of-concepts are typically implemented using powerful software-defined radios [11], [12], [18] or hacked on specific hardware (HW) platforms [13], [19] and hardly describe any implementation detail. As the interest in CTC grows, there is a need to move away from feasibility studies in favour of general CTC solutions supporting multiple HW platforms by design. ...
... In this way, new capabilities such as multi robot operation [16] or enhanced tracking and localization techniques [17], among others can be adopted. In this context, the analysis of wireless channel characterization and its impact on overall system operation is necessary to provide adequate Quality of Service (QoS) and Quality of Experience (QoE) metrics [18,19]. Wireless system design can hence benefit with the adoption of different strategies, mainly in layers 1 to 3, with the definition of functionalities such as dynamic spectrum access [20], delay aware routing protocols [21], link scheduling and cooperative transmission schemes [22,23], traffic offload mechanisms [24], to name a few. ...
... In 2010, ABB made the WISA technology specification available to the PROFIBUS and PROFINET user organization (PNO) to develop it into an open standard, called "Wireless Sensor Actuator Network for Factory Automation" (WSAN-FA) [48]. The PROFIBUS and PROFINET user organization (PNO) published this technology as an industry-standard in 2012 [49]. WSAN-FA also utilizes the physical layer of Bluetooth (IEEE 802.15.1) and provides synchronization between nodes by Frequency Hopping Multiple Access, a timedivision multiple access (TDMA) and Frequency Hopping combination. ...
... Developing an emulation platform for coexistence analysis in wireless automation systems is a viable approach to enable incremental deployment of new wireless communication components within an existing industrial wireless communication network [24]. In particular, the emulation of the production network at a test site enables test-driven development and integration under controlled, yet realistic conditions, while avoiding downtimes of the original production network. ...