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检索条件"机构=Applied Microelectronics and Computer Engineering"

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Approximative Sensor Data Resynchronization for Wireless Burst Transmission Protocols

Approximative Sensor Data Resynchronization for Wireless Bur...

引用

IEEE International Workshop on Factory Communication Systems (WFCS)

作者： Robert Hauser Florian Grützmacher Christian Haubelt Institute of Applied Microelectronics and Computer Engineering University of Rostock Rostock Germany

ISBN: (数字)9798350319347

ISBN: (纸本)9798350319354

We present BurstLR, a novel online resynchronization method for wireless burst transmitted sensor signals. Instead of clock alignment, our method uses approximative timestamp realignment by estimating the relation between sensor clock and receiver clock at the receiver. Only the sensor and arrival timestamps of samples are required. Thus, no additional communication as well as hardware is needed. In our experiments with two wireless sensor nodes (Nicla Sense ME), we achieved a reduction of the average quadratic distance with dynamic time warping between resynchronized acceleration signals that recorded the same arbitrary human motion trajectory by 54.95 % to 76.91 % compared to signals that used the arrival times for synchronization.

关键词： Wireless communication Wireless sensor networks Protocols Dynamics Receivers Production facilities Hardware

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A Novel OPC UA PubSub Protocol Binding Using MQTT for Sensor Networks (MQTT-SN)

A Novel OPC UA PubSub Protocol Binding Using MQTT for Sensor...

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International Conference on Emerging Technologies and Factory Automation (ETFA)

作者： Michael Nast Hannes Raddatz Frank Golatowski Christian Haubelt University of Rostock Institute of Applied Microelectronics and Computer Engineering Rostock Germany

ISBN: (数字)9798350361230

ISBN: (纸本)9798350361247

In this paper, we present the integration of MQTT for Sensor Networks (MQTT-SN) into OPC Unified Architecture (OPC UA) as a novel publish/subscribe (PubSub) protocol binding in order to enhance the industrial communication stack. By leveraging the lightweight MQTT-SN protocol, which is currently not considered in the architecture, we improve OPC UA's capability for high-frequency, low-latency messaging, which is essential for Industrial Internet of Things (IIoT) applications. We discuss related work and describe the design and implementation in detail. Our hybrid approach combines the rich data modeling and security capabilities of OPC UA with the communication efficiency of MQTT-SN, providing a scalable solution for real- time data management in industrial automation systems.

关键词： Protocols Industrial communication Real-time systems Data models Security Low latency communication Manufacturing automation Industrial Internet of Things

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Improving the Real-Time Capability of MQTT for Sensor Networks (MQTT-SN) Using PREEMPT_RT

Improving the Real-Time Capability of MQTT for Sensor Networ...

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IEEE International Workshop on Factory Communication Systems (WFCS)

作者： Michael Nast Michael Rethfeldt Frank Golatowski Christian Haubelt Institute of Applied Microelectronics and Computer Engineering University of Rostock Rostock Germany

ISBN: (数字)9798350319347

ISBN: (纸本)9798350319354

Real-time capability plays an important role in modern factory communication systems. However, protocols such as MQTT, CoAP, and MQTT-SN, which are increasingly finding their way into industrial environments alongside industrial-grade protocols such as OPC UA and DDS, cannot fulfill the timing requirements without further optimization. In this paper, we present extensions of MQTT-SN to improve the real-time behavior in combination with PREEMPT_RT, which provides different real-time mechanisms for the Linux kernel. We address general, operating system-based, and hardware-specific optimizations. Their benefits are demonstrated by measurements in a practical testbed. The proposed extensions reduce delay and jitter, but do not aim to guarantee an upper bound on end-to-end delay.

关键词： Protocols Upper bound Linux Jitter Real-time systems Production facilities Delays

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Localization in 6G: A Journey along existing Wireless Communication Technologies

Localization in 6G: A Journey along existing Wireless Commun...

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IEEE International Workshop on Factory Communication Systems (WFCS)

作者： Benjamin Rother Nico Kalis Christian Haubelt Frank Golatowski Institute of Applied Microelectronics and Computer Engineering University of Rostock Rostock Germany

ISBN: (数字)9798350319347

ISBN: (纸本)9798350319354

In this study, the authors examine the technical challenges associated with wireless localization algorithms in indoor environments. The paper presents an in-depth analysis of various wireless communication technologies, meticulously summarizing their salient features and their implications within the broader scope of research. The outcomes of this study contribute significant technical insights into the capabilities and limitations of Joint Communications and Sensing (JCAS) technology. These insights are pivotal for advancing seamless data exchange and achieving comprehensive connectivity in the realm of 6G wireless communication networks, particularly those that integrate localization functionalities. The detailed findings of this research are poised to inform and influence subsequent technical research and developmental strategies in this specialized field.

关键词： Wireless communication 6G mobile communication Location awareness Wireless sensor networks Technological innovation Transforms Sensors

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A Novel Strategy for Flexible Placement and Routing of AVS Sensors on FPGAs

A Novel Strategy for Flexible Placement and Routing of AVS S...

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International Conference on Field Programmable Logic and Applications

作者： Christoph Niemann Michael Rethfeldt Dirk Timmermann Institute of Applied Microelectronics and Computer Engineering University of Rostock Germany

Adaptive Voltage Scaling (AVS) is a well-known technique in ASICs. However, the requirements for its application in FPGAs are quite different. AVS uses run-time knowledge to determine a favorable voltage/frequency operating point. There are many suggestions in the literature for the sensors to be used to gain this run-time knowledge. However, the specific placement and routing of each sensor instance is either ignored or manually defined by hard macros or directed routing. In this paper, we propose a new approach to sensor placement. We are able to omit strict constraints like directed routing and give more freedom to the EDA tool without compromising sensor accuracy by using a proper sensor calibration. As a result, we are able to avoid placement and routing conflicts between sensors and application design. This allows the use of larger sensors with significant routing delay. An extensive experimental evaluation proves the validity of our approach.

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Design and Performance Evaluation of a Standalone MQTT for Sensor Networks (MQTT-SN) Broker

Design and Performance Evaluation of a Standalone MQTT for S...

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IEEE International Workshop on Factory Communication Systems (WFCS)

作者： Michael Nast Frank Golatowski Dirk Timmermann Institute of Applied Microelectronics and Computer Engineering University of Rostock Rostock Germany

The Message Queuing Telemetry Transport (MQTT) protocol is a de-facto standard for machine-to-machine (M2M) communication in the Internet of Things (IoT) domain. However, since it is limited to TCP at transport layer, it is not possible to run MQTT over UDP, which would be desirable for real-time capable publish/subscribe. MQTT for Sensor Networks (MQTT-SN), which is a lightweight version of MQTT, allows the use of UDP, however, is strongly coupled to MQTT by the current specification and cannot be operated independently of it. In this work, we therefore propose a standalone broker implementation of MQTT-SN. In initial measurements, we can show that our approach is much more performant than the approach described in the specification and that our implementation compares very well with the protocols CoAP Pub/Sub and MOTT.

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A SystemC Model of the IEEE 802.11 EDCA Protocol for Virtual Prototyping

A SystemC Model of the IEEE 802.11 EDCA Protocol for Virtual...

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2021 International Symposium on Networks, computers and Communications, ISNCC 2021

作者： Beichler, Benjamin Rethfeldt, Michael Raddatz, Hannes Steffen, Lukas Timmermann, Dirk Haubelt, Christian Institute Of Applied Microelectronics And Computer Engineering University Of Rostock Germany

ISBN: (纸本)9780738113166

Due to the increasing complexity of distributed embedded systems, the development process demands early substantiation of design decisions for the targeted system. Virtual prototypes enable an early validation of hardware/software systems and they have proven to be very beneficial for target software development. However, these prototypes often do not include models for inter-device communication aspects of distributed systems. Especially the use of wireless communication has a significant impact on the overall system behavior and performance. This paper introduces a SystemC model of an essential part of IEEE 802.11 Wireless LAN communication, the Enhanced Distributed Channel Access (EDCA) protocol. In comparison to widely used network simulations, the modeling with SystemC promises an easier integration into existing virtual prototypes. EDCA is the main part of the lower medium access layer (MAC) of IEEE 802.11 and interfaces to the physical-layer communication as well as to non-time-critical higher MAC-layer functions. We conducted experiments with an additional simple physical communication channel model to compare our solution in terms of precision and performance to the well-established network simulator ns-3. We show that our model differs by $\approx 0.3 \%$ of retransmitted frames and an accompanied difference of the overall simulated transmission time of $\approx 0.45 \%$. It meets the overall expectations for the stochastic EDCA protocol. Moreover, the presented model has a significantly better simulation performance with $3 \cdot 10^{-5}$ s wall-clock time per frame, which is at least two orders of magnitude better than with the compared ns-3 simulation. © 2021 IEEE.

关键词： Stochastic systems

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IEEE 11073 SDC for Pandemics like COVID-19: Example Implementation of an Isolation Room

IEEE 11073 SDC for Pandemics like COVID-19: Example Implemen...

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作者： Kasparick, Martin Schackmann, Dennis Klotz, Tobias Ritz, Fabian Golatowski, Frank Rethfeldt, Michael Neumuth, Thomas Timmermann, Dirk Rockstroh, Max Institute of Applied Microelectronics and Computer Engineering University of Rostock Richard-Wagner-Straße 31 Rostock Germany ICCAS University of Leipzig Leipzig Germany Drägerwerk AG and Co. KGaA Lübeck Germany Institute of Applied Microelectronics and Computer Engineering University of Rostock Rostock Germany

Treating patients in an intensive care unit (ICU) isolation room is full of challenges for the caregivers and the patients. While this is known for years, the COVID-19 pandemic has highlighted these challenges as if under a burning glass – intensified by a high number of patients at the same time. The risk of infection for the caregivers is very high inside the isolation room and the time spent for putting on and taking off personal protective equipment (PPE) is enormous. Thus, every treatment that can be performed from the anteroom of the isolation room at the same quality level as if being inside the isolation room is a potential building block for solving the challenges. However, data like vital signs have to be provided to the anteroom, alarms have to be transferred to the right caregiver at the right place, and controlling medical device parameters from the anteroom are prerequisites. The new IEEE 11073 Service-oriented Device Connectivity (SDC) series of standards is a key technology to realize this. Therefore, this paper presents an example implementation of IEEE 11073 SDC-based ICU isolation rooms by means of a demonstrator. Such systems can significantly reduce the amount of time the caregivers have to spend in the isolation room and reduce the number of clothing (PPE) changes while providing care at a level of a non-isolation room. As a midterm goal these are steps for the vision of a "silent/quiet ICU". © 2022 The Author(s), published by De Gruyter.

关键词： COVID-19

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An Online Scheduler for Reconfigurable Time-Sensitive Networks

An Online Scheduler for Reconfigurable Time-Sensitive Networ...

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International Conference on Emerging Technologies and Factory Automation (ETFA)

作者： Fabian Kummer Frank Golatowski Willi Brekenfelder Helge Parzyjegla Peter Danielis Gero Mühl Institute of Applied Microelectronics and Computer Engineering University of Rostock Rostock Germany Institute of Computer Science University of Rostock Rostock Germany

ISBN: (数字)9798350361230

ISBN: (纸本)9798350361247

Time-Sensitive Networking (TSN) facilitates the implementation of realtime data traffic with deterministic delay and jitter in Ethernet networks. In its time-triggered communication variant, network paths as well as transmission time slots along the paths need to be planned and reserved for all data streams, respectively. Conventionally, such a feasible (i. e., realtime compliant) network schedule is computed and optimized offline, installed upon deployment, and cannot be changed anymore at runtime without stopping the communication. The latter becomes unsuitable for future industrial use cases with a growing demand for flexibility including schedule adjustments. In this paper, we present an online scheduler capable to incrementally integrate new streams at runtime and to adapt the existing schedule, if necessary, while retaining the realtime guarantees given to active streams. For this purpose, the scheduling heuristic identifies streams whose adjustment requires minimal reconfiguration efforts. In a thorough evaluation, we analyze the scheduler's trade-off between resource usage and schedule quality showing its suitability for diverse application scenarios.

关键词： Schedules Runtime Job shop scheduling Conferences Transforms Jitter Servers Resource management Streams Smart manufacturing

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Room Lighting for Grid Stabilization 5

Room Lighting for Grid Stabilization

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5th International Conference on Smart Grid and Smart Cities, ICSGSC 2021

作者： Uster, Felix Plocksties, Franz Timmermann, Dirk Institute of Applied Microelectronics and Computer Engineering University of Rostock Rostock Germany

ISBN: (纸本)9780738133157

Load control for consumer devices offers great potential in terms of power grid stabilization. Utilizing power adaptation capabilities of modern electronics allows a wide range of devices to participate in the grid stabilization. Certain electronic devices, like lighting, are directly perceived by humans or part of larger installations. Therefore, a minimum impact on perception and system integrity facilitates acceptance and allows a wide distribution. Taking advantage of the human properties for perceiving changes in light we propose an effective grid stabilization method for considerable network imbalances in order to utilize the high share of the total power demand in Europe that lighting accounts for. With regard to the results, we can assume a considerable stabilizing effect with hardly noticeable perception. © 2021 IEEE.

关键词： Stabilization

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