Sensor Networks
| Contact | Prof. Dr. rer. nat. Volker Turau |
| Staff |
Björn Greßmann
Jürgen Jessen Helge Klimek Christian Renner Stefan Unterschütz Christoph Weyer |
Project Description
The rapid technological progress allows for the integration of sensors, processors, wireless communication units, and energy sources on extremely small space nowadays. Networks consisting of high numbers of such nodes deployed in situ, physically placed in the environment close to objects they are sensing or even moving around allow numerous novel applications in environments where a cabling is not feasible or too inflexible. From a scientific point of view, sensor networks differ substantially from classical networks and distributed systems, they pose unique challenges:
- Sensors are battery operated and placed in remote locations, so all activities drain the sensor battery, and bring the node closer to death. Since communication subsystems consume a large fraction of total energy, solutions for energy-efficient communication are needed.
- Sensor networks focus on collaborative data processing to exploit multiple, physically separate views on the environment. This requires new routing algorithms and in-network processing based on distributed algorithms.
- With hundreds or thousands of sensor nodes, the network and applications as a whole must be self-configuring.
In this project, heterogeneous sensor networks consisting of a broad palette of different kinds of nodes, of highly primitive sensors with minimal energy supply, computing power, and communication bandwidth, passive RFID based devices, stationary sensors connected to a LAN up to nodes with resources for aggregation and processing of data are considered.
The focus of our research is currently on the following topics:
- Cross-layer optimization between link and network layer.
- Dynamic neighborhood protocols.
- Algorithms for topology control based on clustering.
- Interaction of moving nodes with a stationary sensor network.
- Methods for management of sensor data, where both network internal and external storage of the data are considered.
- How can data from sensor networks be utilized in applications on a higher abstraction layer (vertical integration problem)?
- Lightweight geographic routing algorithms tolerating location uncertainty.
- Field tests.
Subprojects
-
EBS - Energy budgeted sensor networks based on renewable energy sources
EBS investigates sensor networks based on renewable energy sources such as solar power. The goal is to develop models and algorithms that allow to run such a network permanently. For this purpose energy consumption and energy generation must be measured on a very fine scale. At run time a scheduler determines which processes to run based on available energy budgets.
-
SomSeD - Selbstorganisierende mobile Sensor- und Datenfunknetze
Somsed erforscht Grundlagen und Techniken für eine dauerhafte und flächendeckende messtechnische Erfassung physikalischer und biologischer Messgrößen und die zugehörige Signalauswertetechnik mittels drahtloser Sensornetzwerke. Letztere sind Netzwerke bestehend aus stationären oder mobilen Sensorknoten, in denen Messtechnik, Aktuatoren, eine Datenverarbeitungseinheit, Energieversorgung und eine drahtlose Funkschnittstelle auf kleinstem Raum integriert sind.
Publications
Christian Renner, Florian Meier and Volker Turau. Holistic Online Energy Assessment: Feasibility and Practical Application. In Proceedings of the 9th IEEE International Conference on Networked Sensing Systems (INSS'12), June 2012. Antwerp, Belgium. To be published.
@InProceedings{Telematik_RT_2012_HolisticEnergyAssessment,
author = {Christian Renner and Florian Meier and Volker Turau},
title = {Holistic Online Energy Assessment: Feasibility and Practical Application},
booktitle = {Proceedings of the 9th IEEE International Conference on Networked Sensing Systems (INSS'12)},
day = {11-14},
month = jun,
year = 2012,
location = {Antwerp, Belgium},
}
Abstract:
Combining energy harvesting with energy-aware scheduling enables perpetually operating sensor networks. The practical realization of this goal yet requires reliable and precise holistic online energy assessment. While the building blocks--assessing residual energy, predicting energy intake, and tracing energy consumption--have been studied in detail, the analysis of their interaction on a real platform has been neglected.
This paper answers the question, whether these techniques can be easily joined to give a precise and correct picture of a sensor node's energetic state and behavior.
For this purpose, we model the energy flow of a prototype energy-harvesting sensor node and evaluate the joint performance of state-of-the-art energy assessment based on a field test. We verify the system model and show the feasibility of holistic energy assessment, which tolerates small configuration errors, achievable with a combination of generic configuration and online calibration.
We also analyze the feasibility of forecasting a node's future energetic state, and find that the presented method gives sufficient results for uniformly distributed consumption profiles.
Christian Renner, Florian Meier and Volker Turau. Policies for Predictive Energy Management with Supercapacitors. In Proceedings of the 8th IEEE International Workshop on Sensor Networks and Systems for Pervasive Computing (PerSeNS'12), March 2012. Lugano, Switzerland.
@InProceedings{Telematik_RT_2012_Epol,
author = {Christian Renner and Florian Meier and Volker Turau},
title = {Policies for Predictive Energy Management with Supercapacitors},
booktitle = {Proceedings of the 8th IEEE International Workshop on Sensor Networks and Systems for Pervasive Computing (PerSeNS'12)},
day = {19-23},
month = mar,
year = 2012,
location = {Lugano, Switzerland},
}
Abstract:
This paper presents an algorithm to dynamically determine the maximum supported uniform demand for energy of sensor nodes powered by energy harvesters using supercapacitors as energy buffers. Knowledge about the maximum uniform consumption is required to adapt the sensor node's duty cycle or task schedule to achieve uniform, utility-maximizing, and depletion-safe operation. Our algorithm makes use of a supercapacitors' relationship between state-of-charge and voltage, is particularly designed to handle the non-linear system model, and is lightweight enough to run on low-power sensor node hardware. We define three energy policies, evaluate their performance using a real-world solar-harvesting trace, and analyze the influence of the supercapacitor's capacity and errors of the energy forecast.
Christian Renner and Volker Turau. Adaptive Energy-Harvest Profiling to Enhance Depletion-Safe Operation and Efficient Task Scheduling. Sustainable Computing: Informatics and Systems, 2(1):43–56, March 2012.
@Article{Telematik_RT_2012_AdaptiveSlotting,
author = {Christian Renner and Volker Turau},
title = {Adaptive Energy-Harvest Profiling to Enhance Depletion-Safe Operation and Efficient Task Scheduling},
pages = {43-56},
journal = {Sustainable Computing: Informatics and Systems},
volume = {2},
number = {1},
month = mar,
year = 2012,
issn = {2210-5379},
}
Abstract:
Forecasting the expected energy harvest enables small-sized energy-harvesting sensor nodes to schedule tasks or adapt the radio duty cycle. This ability ensures depletion-safe and efficient operation. Most energy sources exhibit cyclic patterns of intensity, e.g., the sun. These patterns show periods with unequal--low versus high and stable versus varying--energy production and heavily depend on a node's location as well as seasonal and environmental changes. Existing forecast algorithms do not exploit these patterns, but create and update forecasts at static and arbitrary points in time, the main knob being the number of updates per cycle. We present a method enabling sensor nodes to adapt to harvesting patterns at runtime. It is designed for seamlessly replacing the static scheme to improve the accuracy of a wide range of existing forecast algorithms.
In our evaluation, we show that (i) the adaptive method traces the energy pattern in real-world deployments accurately, (ii) reacts to seasonal and environmental changes, (iii) increases forecast accuracy, and (iv) reduces the number of prediction updates. These achievements enhance depletion-safe operation and efficient task scheduling with fewer recalculations and adjustments of the duty cycle. They also facilitate the exchange of harvesting forecasts for collaborative node tasks, since less information has to be shared.
Christian Renner, Florian Meier and Volker Turau. Poster Abstract: Energy Assessment in Praxis. In Adjunct Proceedings of the 9th European Conference on Wireless Sensor Networks (EWSN'12), February 2012. Trento, Italy.
@InProceedings{Telematik_RT_2012_EnergyAssessment,
author = {Christian Renner and Florian Meier and Volker Turau},
title = {Poster Abstract: Energy Assessment in Praxis},
booktitle = {Adjunct Proceedings of the 9th European Conference on Wireless Sensor Networks (EWSN'12)},
day = {15-17},
month = feb,
year = 2012,
location = {Trento, Italy},
}
Abstract:
Combining energy harvesting with energy-aware scheduling enables perpetually operating sensor networks. Practical realization yet requires precise holistic online energy assessment. The building blocks are available, but the analysis of their interaction has been neglected. To close the gap, we evaluate the joint performance of energy assessment components. Our experiments substantiate that holistic energy assessment is feasible and that small configuration errors are tolerable.
Stefan Unterschütz, Christian Renner and Volker Turau. Opportunistic, Receiver-Initiated Data-Collection Protocol. In Proceedings of the 9th European Conference on Wireless Sensor Networks (EWSN'12), February 2012. Trento, Italy.
@InProceedings{Telematik_URT_2012_Orinoco,
author = {Stefan Unterschütz and Christian Renner and Volker Turau},
title = {Opportunistic, Receiver-Initiated Data-Collection Protocol},
booktitle = {Proceedings of the 9th European Conference on Wireless Sensor Networks (EWSN'12)},
day = {15-17},
month = feb,
year = 2012,
location = {Trento, Italy},
}
Abstract:
This paper presents and evaluates ORiNoCo, a novel data-collection and event-reporting protocol for sensor networks. ORiNoCo is built upon the asynchronous duty-cycle protocol RI-MAC and breaks with the tradition of exchanging extensive neighborhood information, a cornerstone of many competing collection protocols and one of their major source of communication overhead and energy expenditure. The merit of this venture is an opportunistic, energy-efficient, latency-reducing, and self-stabilizing protocol. ORiNoCo comes at virtually no extra costs in terms of memory demand and communication overhead compared to RI-MAC. We derive theoretical boundaries for the improvements in radio efficiency, latency, and energy-consumption. ORiNoCo is verified with these findings via simulation and compared with CTP. ORiNoCo achieves lower energy-consumption while reducing end-to-end delays.
Christian Renner, Stefan Unterschütz and Volker Turau. Power Management for Wireless Sensor Networks Based on
Energy Budgets. Technical Report urn:nbn:de:gbv:830-tubdok-11065, Hamburg University of Technology, Hamburg, Germany, July 2011.
@TechReport{Renner_Unterschuetz_PowerManagement-TechReport,
author = {Christian Renner and Stefan Unterschütz and Volker Turau},
title = {Power Management for Wireless Sensor Networks Based on
Energy Budgets},
number = {urn:nbn:de:gbv:830-tubdok-11065},
institution = {Hamburg University of Technology},
address = {Hamburg, Germany},
month = jul,
year = 2011,
}
Abstract:
This paper proposes and assesses analytical tools for
large-scale
monitoring applications with wireless sensor networks
powered by
energy-harvesting supplies. We introduce the concept of an
energy
budget, the amount of energy available to a sensor node for a
given period of time. The presented tools can be utilized to
realize
distributed algorithms that determine a schedule to
perform the
monitoring task and the inherent communication.
Scheduling is based on
the energy budgets of the nodes or on
latency requirements. In this
context, we derive theoretical
results for the energy consumption of
the individual nodes plus
the latency of event-reporting. These
results are verified by
simulations and a real testbed implementation.
Christian Renner, Sebastian Ernst, Christoph Weyer and Volker Turau. Prediction Accuracy of Link-Quality Estimators. In Proceedings of the 8th European Conference on
Wireless Sensor Networks (EWSN'11), February 2011. Bonn, Germany. Acceptance rate 20%.
@InProceedings{Telematik_REWT_HoPS,
author = {Christian Renner and Sebastian Ernst and Christoph Weyer and Volker Turau},
title = {Prediction Accuracy of Link-Quality Estimators},
booktitle = {Proceedings of the 8th European Conference on
Wireless Sensor Networks (EWSN'11)},
day = {23-25},
month = feb,
year = 2011,
location = {Bonn, Germany},
note = {Acceptance rate 20%},
}
Abstract:
The accuracy of link-quality estimators (LQE) is
mission-critical in
many application scenarios in wireless sensor
networks (WSN), since
the link-quality metric is used for routing
decisions or neighborhood
formation. Link-quality estimation must
offer validity for different
timescales. Existing LQEs describe and
approximate the current
quality in a single value only. This method
leads to a limited
accuracy and expressiveness about the presumed
future behavior of a
link. The LQE developed in this paper
incorporates four quality
metrics that give a holistic assessment of
the link and its dynamic
behavior; therefore, this research is an
important step to achieving
a higher prediction accuracy including
knowledge about the short- and
long-term behavior.
Sebastian Ernst, Christian Renner, Christoph Weyer and Volker Turau. Holistic Packet Statistics for Neighborhood Management
in Sensor Networks. In Proceedings of the 9th GI/ITG KuVS Fachgespräch
"Drahtlose Sensornetze" (FGSN'10), September 2010, pp. 17–20. Würzburg, Germany.
@InProceedings{Telematik_ERWT_HoPS,
author = {Sebastian Ernst and Christian Renner and Christoph Weyer and Volker Turau},
title = {Holistic Packet Statistics for Neighborhood Management
in Sensor Networks},
booktitle = {Proceedings of the 9th GI/ITG KuVS Fachgespräch
"Drahtlose Sensornetze" (FGSN'10)},
pages = {17-20},
day = {16-17},
month = sep,
year = 2010,
location = {Würzburg, Germany},
}
Abstract:
Knowledge of neighboring nodes is a fundamental
requirement of many algorithms
in the field of wireless sensor
networks.
The neighborhood relation of nodes is defined by their
ability to
communicate directly and not by their proximity.
Due to the
temporal changes of the wireless channel, link qualities must
be
continuously estimated.
In this paper a new approach based on holistic
packet statistics is
presented.
Unlike existing estimation techniques
it forswears from squeezing a link's
characteristics into a single
value.
The benefit of this approach is substantiated by an evaluation
utilizing
real-world and synthetic data.
Christian Renner, Volker Turau and Christoph Weyer. Performance of Energy-Efficient TDMA Schemes in
Data-Gathering Scenarios with Periodic Sources. In Proceedings of the 7th IEEE International
Conference on Networked Sensing Systems (INSS'10), June 2010. Kassel, Germany. Acceptance rate 22%.
@InProceedings{Telematik_RTW_EnergyEfficientTDMA,
author = {Christian Renner and Volker Turau and Christoph Weyer},
title = {Performance of Energy-Efficient TDMA Schemes in
Data-Gathering Scenarios with Periodic Sources},
booktitle = {Proceedings of the 7th IEEE International
Conference on Networked Sensing Systems (INSS'10)},
day = {15-18},
month = jun,
year = 2010,
location = {Kassel, Germany},
note = {Acceptance rate 22%},
}
Abstract:
Energy-efficient transportation of periodical sensor
readings towards a single sink
in wireless sensor networks is a
challenging task. In general, two
data-gathering strategies exist:
on-demand and bulk data forwarding.
For both strategies, cross-layer
techniques are a promising approach,
where TDMA is tailored to the
underlying routing tree. Therefore,
different TDMA schemes are
compared regarding achievable throughput,
packet delay, and
energy-efficiency for various sampling rates and
scenarios. Existing
schemes perform well in dedicated topologies
only. The new and simple
TDMA scheme presented in this paper
outperforms its predecessors in
all scenarios under consideration.
These findings are substantiated by
both theoretical analysis and
extensive simulation.
Christian Renner and Volker Turau. CapLibrate: Self-Calibration of an Energy Harvesting
Power Supply with Supercapacitors. In Proceedings of the GI/ITG Workshop on Energy-aware
Systems and Methods, February 2010. Hannover, Germany.
@InProceedings{Telematik_RT_2010_CapLibrate,
author = {Christian Renner and Volker Turau},
title = {CapLibrate: Self-Calibration of an Energy Harvesting
Power Supply with Supercapacitors},
booktitle = {Proceedings of the GI/ITG Workshop on Energy-aware
Systems and Methods},
day = {22-23},
month = feb,
year = 2010,
location = {Hannover, Germany},
}
Abstract:
Achieving perpetual and self-sustaining operation of
wireless sensor nodes is
an important topic of current research in the
field of energy
harvesting. Closely related to this is the employment
of energy
budgeting, i.e., effective utilization of available and
future energy
resources without pushing a node towards the hazard of
energy
depletion. Therefore, reliable prediction of node lifetime in
context
of the available energy within a given time is required. This
in turn
requires self-calibration of the sensor nodes and their energy
harvesting supply. In this paper, we explore and assess models for a
supercapacitor-based harvesting supply. The parameters of the models
are discussed and determined, so that fast, reliable, and
energy-efficient calibration becomes possible. Moreover, measurement
results for a specific hardware platform are discussed and a roadmap
for a self-calibration algorithm is presented.
Matthias Witt and Volker Turau. Robust and Low-Communication Geographic Routing for
Wireless Ad Hoc Networks. Wireless Communications and Mobile Computing, 10(4):486–510, 2010.
@Article{Telematik_TW_2009_GeographicRouting,
author = {Matthias Witt and Volker Turau},
title = {Robust and Low-Communication Geographic Routing for
Wireless Ad Hoc Networks},
pages = {486-510},
journal = {Wireless Communications and Mobile Computing},
volume = {10},
number = {4},
year = 2010,
}
Christian Renner, Jürgen Jessen and Volker Turau. Poster: Energy Estimation for Harvesting Supplies with Supercaps. In Proceedings of the Workshop on Self-Organizing
Wireless Sensor and Communication Networks, October 2009. Hamburg, Germany.
@InProceedings{Telematik_RJT_2009_EnergyEstimation,
author = {Christian Renner and Jürgen Jessen and Volker Turau},
title = {Poster: Energy Estimation for Harvesting Supplies with Supercaps},
booktitle = {Proceedings of the Workshop on Self-Organizing
Wireless Sensor and Communication Networks},
day = {8-9},
month = oct,
year = 2009,
location = {Hamburg, Germany},
}
Arne Bosien and Volker Turau. RFID for Mobile Applications. In Proceedings of the Workshop on Self-Organizing
Wireless Sensor and Communication Networks, October 2009, pp. 27–33. Hamburg, Germany.
@InProceedings{Telematik_SOMSED_2009_MOBILE_RFID,
author = {Arne Bosien and Volker Turau},
title = {RFID for Mobile Applications},
booktitle = {Proceedings of the Workshop on Self-Organizing
Wireless Sensor and Communication Networks},
pages = {27-33},
day = {8-9},
month = oct,
year = 2009,
location = {Hamburg, Germany},
}
Abstract:
The availability of fast anti-collision algorithms is
crucial for most RFID applications. This paper aims to evaluate these
algorithms for applications in which it is not intended to identify
the entirety of moving objects but to detect as much tags as needed
to allow orientation. The navigation of Automated Guided Vehicles
(AGV) by distributed landmarks is an example which clarifies the
discriminative requirements compared to supply chain tasks. For the
former purpose redundant information can be gained from different
tags. This requires the detection of an application dependent
percentage of all tags. Because AGVs are moving, the detection and
read and write operations have to be close together and very fast,
since repetitive communication is not always possible.
Andreas Lagemann, Jörg Nolte, Christoph Weyer and Volker Turau. Mission Statement: Applying Self-Stabilization to
Wireless Sensor Networks. In Proceedings of the 8th GI/ITG KuVS Fachgespräch
"Drahtlose Sensornetze" (FGSN'09), August 2009, pp. 47–49. Hamburg, Germany.
@InProceedings{Telematik_LNWT_2009_SelfWISE,
author = {Andreas Lagemann and Jörg Nolte and Christoph Weyer and Volker Turau},
title = {Mission Statement: Applying Self-Stabilization to
Wireless Sensor Networks},
booktitle = {Proceedings of the 8th GI/ITG KuVS Fachgespräch
"Drahtlose Sensornetze" (FGSN'09)},
pages = {47-49},
day = {13-14},
month = aug,
year = 2009,
location = {Hamburg, Germany},
}
Abstract:
Long living and unattended deployments of wireless
sensor networks
requires fault-tolerant solutions.
Self-stabilizing
algorithms are providing these properties in an elegant and
verifiable way. Recently,
a lot of research has been performed to
determine appropriate means to
apply these promising technique
to
wireless sensor networks. In this paper the current state of the art
in this field is given.
Additionally, three major challenges are
presented for achieving self-stabilizing
sensor networks.
Christoph Weyer, Christian Renner, Volker Turau and Hannes Frey. A Roadmap for Hardware and Software Support for
Developing Energy-Efficient Sensor Networks. In Proceedings of the 8th GI/ITG KuVS Fachgespräch
"Drahtlose Sensornetze" (FGSN'09), August 2009, pp. 67–70. Hamburg, Germany.
@InProceedings{Telematik_WRTF_2009_Roadmap,
author = {Christoph Weyer and Christian Renner and Volker Turau and Hannes Frey},
title = {A Roadmap for Hardware and Software Support for
Developing Energy-Efficient Sensor Networks},
booktitle = {Proceedings of the 8th GI/ITG KuVS Fachgespräch
"Drahtlose Sensornetze" (FGSN'09)},
pages = {67-70},
day = {13-14},
month = aug,
year = 2009,
location = {Hamburg, Germany},
}
Abstract:
Support for developing energy-efficient applications
for wireless sensor
networks is still scarce.
In this paper a roadmap
of a combined hardware and software approach is
presented. The main
idea is
to collect state information and trace energy consumption of
an
application running in a testbed of
real sensor nodes.
Felix Hackbarth, Thomas Meyerhoff, Harald Sauff, Bryce T. Bradford, Luis Torres, Helge Klimek, Björn Gressmann, Christian Renner, Martin Stemick, Christoph Weyer and Sebastian Georgi. SomSed - The Evolution of an Experimental Wireless
Sensor Network Towards a Research Platform. In Proceedings of the 8th GI/ITG KuVS Fachgespräch
"Drahtlose Sensornetze" (FGSN'09), August 2009, pp. 27–30. Hamburg, Germany.
@InProceedings{Telematik_HMSB_2009_SomSeD,
author = {Felix Hackbarth and Thomas Meyerhoff and Harald Sauff and Bryce T. Bradford and Luis Torres and Helge Klimek and Björn Gressmann and Christian Renner and Martin Stemick and Christoph Weyer and Sebastian Georgi},
title = {SomSed - The Evolution of an Experimental Wireless
Sensor Network Towards a Research Platform},
booktitle = {Proceedings of the 8th GI/ITG KuVS Fachgespräch
"Drahtlose Sensornetze" (FGSN'09)},
pages = {27-30},
day = {13-14},
month = aug,
year = 2009,
location = {Hamburg, Germany},
}
Abstract:
The exploratory focus of the SomSed research field is
the
interdisciplinary research on self organizing mobile
sensor and
data networks. Since the founding of SomSed in 2007, great
progress in
scientific research has been
achieved and much practical knowledge has
been gathered using a prototype
network permanently installed. This
prototype network, from hereon referred to as CampusNet, is the basis
for
further investigations and offers the
possibility to perform long
term measurements in a large scale and real
environment. The scope of
this paper is
to outline the current status of the SomSed research
field and to
briefly discuss future developments.
Torsten Stremlau, Christoph Weyer and Volker Turau. tinyMoBot: A Platform for Mobile Sensor Networks. In Proceedings of the 8th GI/ITG KuVS Fachgespräch
"Drahtlose Sensornetze" (FGSN'09), August 2009, pp. 43–44. Hamburg, Germany.
@InProceedings{Telematik_SW_2009_LEGO,
author = {Torsten Stremlau and Christoph Weyer and Volker Turau},
title = {tinyMoBot: A Platform for Mobile Sensor Networks},
booktitle = {Proceedings of the 8th GI/ITG KuVS Fachgespräch
"Drahtlose Sensornetze" (FGSN'09)},
pages = {43-44},
day = {13-14},
month = aug,
year = 2009,
location = {Hamburg, Germany},
}
Abstract:
In many application scenarios of wireless sensor
networks parts or the
whole network consist of mobile sensor
nodes.
Currently, no common platform is available. This paper describes a
project that has developed a mobile
sensor node, based on standard
components: a Crossbow IRIS mote and LEGO
MINDSTORMS NXT components,
i.e.,
motors and sensors.
Lars Niemann, Marcus Venzke, Christian Renner and Volker Turau. Clock Synchronization of TinyOS-based Sensor Networks
with DCF77. In Proceedings of the 8th GI/ITG KuVS Fachgespräch
"Drahtlose Sensornetze" (FGSN'09), August 2009, pp. 45–46. Hamburg, Germany.
@InProceedings{Telematik_NVRT_2009_DCF77,
author = {Lars Niemann and Marcus Venzke and Christian Renner and Volker Turau},
title = {Clock Synchronization of TinyOS-based Sensor Networks
with DCF77},
booktitle = {Proceedings of the 8th GI/ITG KuVS Fachgespräch
"Drahtlose Sensornetze" (FGSN'09)},
pages = {45-46},
day = {13-14},
month = aug,
year = 2009,
location = {Hamburg, Germany},
}
Abstract:
The paper presents an approach of applying DCF77 time
radio signals to
provide a clock with global time in sensor
networks
based on TinyOS. Some nodes containing DCF77 receiver hardware
reliably decode time signals even if these are
distorted to some
extent. The clock with global time is provided by
compensating clock
drift. Time is distributed in
the network with a protocol generating
timestamps on the MAC layer.
Christian Renner, Jürgen Jessen and Volker Turau. Lifetime Prediction for Supercapacitor-powered Wireless
Sensor Nodes. In Proceedings of the 8th GI/ITG KuVS Fachgespräch
"Drahtlose Sensornetze" (FGSN'09), August 2009, pp. 55–58. Hamburg, Germany.
@InProceedings{Telematik_RJT_2009_Supercap,
author = {Christian Renner and Jürgen Jessen and Volker Turau},
title = {Lifetime Prediction for Supercapacitor-powered Wireless
Sensor Nodes},
booktitle = {Proceedings of the 8th GI/ITG KuVS Fachgespräch
"Drahtlose Sensornetze" (FGSN'09)},
pages = {55-58},
day = {13-14},
month = aug,
year = 2009,
location = {Hamburg, Germany},
}
Abstract:
Energy-aware task scheduling is a novel research
direction for wireless sensor
networks. It depends on accurate
models
for lifetime prediction. In other terms, nodes must be aware of
present and future energy resources. This
paper addresses the first
step towards reaching this goal: It explores
discharging-characteristics of
supercapacitors, discusses analytical
discharging-models for lifetime prediction, and
evaluates these models
by
comparing them with real discharging curves.
Christoph Weyer, Volker Turau, Andreas Lagemann and Jörg Nolte. Programming Wireless Sensor Networks in a
Self-Stabilizing Style. In Proceedings of the Third International Conference
on Sensor Technologies and Applications (SENSORCOMM'09), June 2009. Athens, Greece.
@InProceedings{Telematik_WLT_2009_SelfWISE,
author = {Christoph Weyer and Volker Turau and Andreas Lagemann and Jörg Nolte},
title = {Programming Wireless Sensor Networks in a
Self-Stabilizing Style},
booktitle = {Proceedings of the Third International Conference
on Sensor Technologies and Applications (SENSORCOMM'09)},
day = {18-23},
month = jun,
year = 2009,
location = {Athens, Greece},
}
Abstract:
Wireless Sensor Networks (WSNs) operate in an
unstable environment and thus are subject to arbitrary transient
faults. Self-stabilization is a promising technique to add tolerance
against transient faults in a self-contained non-masking way. A core
factor for the applicability of a given self-stabilizing algorithm is
its convergence time. This paper analyses the average stabilization
time of three algorithms commonly regarded as central building blocks
for WSNs. The analysis is accomplished with SelfWISE, a framework
providing programming abstractions for selfstabilizing algorithms.
The performed analysis considers the target models as well as network
size and density. This demonstrates the usability of SelfWISE for
evaluating selfstabilizing algorithms under a wide range of models.
Christoph Weyer, Christian Renner, Volker Turau and Hannes Frey. TinyAID: Automated Instrumentation and Evaluation
Support for TinyOS. In Proceedings of the Second International Workshop on
Sensor Network Engineering (IWSNE'09), June 2009. Marina del Rey, CA, USA.
@InProceedings{Telematik_WRTF_2009_TinyAID,
author = {Christoph Weyer and Christian Renner and Volker Turau and Hannes Frey},
title = {TinyAID: Automated Instrumentation and Evaluation
Support for TinyOS},
booktitle = {Proceedings of the Second International Workshop on
Sensor Network Engineering (IWSNE'09)},
day = {10},
month = jun,
year = 2009,
location = {Marina del Rey, CA, USA},
}
Abstract:
TinyAID is a tool that supports automated
instrumentation and evaluation of TinyOS-based distributed
applications. Two types of instrumentations are provided: logging of
call chains and message flows within the network. TinyAID assists the
debugging process by post evaluation of the logged data. A main
benefit is the visualization component for representing traces in
their spatial and temporal order. The instrumentation and evaluation
concepts are evaluated in two case studies: the SelfWISE framework
and a selection of routing algorithms. Due to the automated process
of TinyAID the evaluation could be performed without a deeper
knowledge of the implementations under test. In the first case
TinyAID revealed a weakness in the TOSSIM random number generator.
The second case demonstrates the power of TinyAID to visualize the
quality of protocols in a unified manner, without any manual changes
to the specific source code.
Christoph Weyer and Volker Turau. SelfWISE: A Framework for Developing Self-Stabilizing
Algorithms. In Proceedings of the 16th ITG/GI - Fachtagung
Kommunikation in Verteilten Systemen (KiVS'09), March 2009, pp. 67–78. Kassel, Germany.
@InProceedings{Telematik_TW_2009_SelfWISE,
author = {Christoph Weyer and Volker Turau},
title = {SelfWISE: A Framework for Developing Self-Stabilizing
Algorithms},
booktitle = {Proceedings of the 16th ITG/GI - Fachtagung
Kommunikation in Verteilten Systemen (KiVS'09)},
pages = {67-78},
day = {2-6},
month = mar,
year = 2009,
location = {Kassel, Germany},
}
Abstract:
This paper introduces SelfWISE, a framework for
enabling wireless sensor networks to be programmed in a
self-stabilizing manner. The framework eases the formal specification
of algorithms by abstracting from low-level details such as wireless
channel and hardwarespecific characteristics. SelfWISE consists of a
language for expressing self-stabilizing algorithms, a runtime
environment for simulating algorithms in wireless sensor networks,
and supporting tools. The hereby applied transformation of formally
described algorithms into the simulation environment preserves the
self-stabilizing properties. Development, evaluation, and debugging
of self-stabilizing algorithms is considerably facilitated by
utilizing SelfWISE.
Sebastian Georgi, Christoph Weyer, Martin Stemik, Christian Renner, Felix Hackbarth, Ulf Pilz, Jens Eichmann, Tobias Pilsak, Harald Sauff, Luis Torres, Klaus Dembowski and Fabian Wagner. SomSeD: An Interdisciplinary Approach for Developing
Wireless Sensor Networks. In Proceedings of the 7th GI/ITG KuVS Fachgespräch
"Drahtlose Sensornetze" (FGSN'08), September 2008. Berlin, Germany.
@InProceedings{Telematik_GWSR_2008_SOMSeD,
author = {Sebastian Georgi and Christoph Weyer and Martin Stemik and Christian Renner and Felix Hackbarth and Ulf Pilz and Jens Eichmann and Tobias Pilsak and Harald Sauff and Luis Torres and Klaus Dembowski and Fabian Wagner},
title = {SomSeD: An Interdisciplinary Approach for Developing
Wireless Sensor Networks},
booktitle = {Proceedings of the 7th GI/ITG KuVS Fachgespräch
"Drahtlose Sensornetze" (FGSN'08)},
day = {25-26},
month = sep,
year = 2008,
location = {Berlin, Germany},
}
Abstract:
The research field "Self organized mobile Sensor and
Data-networks" (SomSeD) is introduced. Its purpose is the in-
vestigation of Wireless Sensor Networks (WSN). It benefits from
interdisciplinary exchange between various institutes of the Hamburg
University of Technology (TUHH). Due to different design constraints
(such as energy-efficiency and package size) compared to well known
classical computer networks, all aspects of the development of WSNs
must be reconsidered. This paper describes the advantage of having
experts of various faculties both in computer science and electrical
engineering in a single research field. In addition to the
introduction of the participating institutes, the de-
ployment of a
WSN on the TUHH campus will be outlined.
Christoph Weyer, Stefan Unterschütz and Volker Turau. Connectivity-aware Neighborhood Management Protocol in
Wireless Sensor Networks. In Proceedings of the 7th GI/ITG KuVS Fachgespräch
"Drahtlose Sensornetze" (FGSN'08), September 2008. Berlin, Germany.
@InProceedings{Telematik_WUT_2008_Mahalle,
author = {Christoph Weyer and Stefan Unterschütz and Volker Turau},
title = {Connectivity-aware Neighborhood Management Protocol in
Wireless Sensor Networks},
booktitle = {Proceedings of the 7th GI/ITG KuVS Fachgespräch
"Drahtlose Sensornetze" (FGSN'08)},
day = {25-26},
month = sep,
year = 2008,
location = {Berlin, Germany},
}
Abstract:
Neighborhood relations are changing over time in
wireless sensor networks due to different hardware or environmental
effects. These effects and memory limitations require a balanced
neighborhood management to ensure agility, stability, symmetry, and
connectivity. The proposed neighborhood management protocol Mahalle
is optimized with regard to these four criteria. Agility and
stability are achieved by ALE, a new adaptive link estimator.
Kay Römer and Christian Renner. Aggregating Sensor Data from Overlapping Multi-Hop
Network Neighborhoods: Push or Pull?. In Proceedings of the International Conference on
Networked Sensing Systems (INSS'08), June 2008, pp. 107–110. Kanazawa, Japan.
@InProceedings{Telematik_RR_2008_PushOrPull,
author = {Kay Römer and Christian Renner},
title = {Aggregating Sensor Data from Overlapping Multi-Hop
Network Neighborhoods: Push or Pull?},
booktitle = {Proceedings of the International Conference on
Networked Sensing Systems (INSS'08)},
pages = {107-110},
day = {17-19},
month = jun,
year = 2008,
location = {Kanazawa, Japan},
}
Abstract:
Network neighborhoods are a key communication
abstraction in sensor networks, allowing sensor nodes to collect and
aggregate sensor data from nearby other nodes. In many applications,
multi-hop neighborhoods of several nodes overlap, such that nodes
participate in many neighborhoods, having to contribute their data
items to all containing neighborhoods. We consider two orthogonal
approaches to efficiently support this data aggregation problem. A
push-based approach, where each node floods its data item in a
multi-hop neighborhood, and a pull-based approach, where each node
collects data from nodes in a multi-hop network neighborhood using a
spanning tree. Our goal is to identify situations where one approach
outperforms the other. For this, we implement these protocols in
TOSSIM, study overhead and yield as a function of the fraction of
nodes in the network that perform data aggregation over a multi-hop
neighborhood, and report our findings.
Volker Turau, Christoph Weyer and Christian Renner. Efficient Slot Assignment for the Many-to-One Routing
Pattern in Sensor Networks. In Proceedings of the First International Workshop on
Sensor Network Engineering (IWSNE'08), June 2008. Santorini Island, Greece.
@InProceedings{Telematik_TWR_2008_SlotAssignmentManyOne,
author = {Volker Turau and Christoph Weyer and Christian Renner},
title = {Efficient Slot Assignment for the Many-to-One Routing
Pattern in Sensor Networks},
booktitle = {Proceedings of the First International Workshop on
Sensor Network Engineering (IWSNE'08)},
day = {11},
month = jun,
year = 2008,
location = {Santorini Island, Greece},
}
Abstract:
In this paper an efficient TDMA slot assignment for
the many-to-one routing pattern in wireless sensor networks is
presented and analyzed. This assignment scheme is based on a simple
to implement heuristic, named spatial path-based reuse (SPR). By
considering several metrics, the superiority of this heuristic with
respect to energy consumption and runtime compared to proposals found
in the literature is demonstrated.
Arne Bosien, Marcus Venzke and Volker Turau. A rewritable RFID environment for AGV navigation. In Proceedings of the 5th International Workshop on
Intelligent Transportation (WIT'08), March 2008, pp. 87–92. Hamburg, Germany.
@InProceedings{Telematik_BVT_2008_AVG_RFID_Environment,
author = {Arne Bosien and Marcus Venzke and Volker Turau},
title = {A rewritable RFID environment for AGV navigation},
booktitle = {Proceedings of the 5th International Workshop on
Intelligent Transportation (WIT'08)},
pages = {87-92},
day = {18-19},
month = mar,
year = 2008,
location = {Hamburg, Germany},
}
Abstract:
The paper analyses potentials, challenges, and
applications of using
rewritable, stationary RFID tags for marking
routes for autonomous
vehicles in manufacturing environments. This
approach promises to be
flexible, robust, and inexpensive. Two
algorithms are proposed also
considering additional sensors.
Norbert Luttenberger, Stefan Fischer, Erik Mähle, Dirk Timmermann and Volker Turau. Multi-hybride Sensornetze. PIK - Praxis der Informationsverarbeitung und
Kommunikation, 31(3):141–145, 2008.
@Article{Telematik_LFMTT_2008_MultiHybrideSensornetze,
author = {Norbert Luttenberger and Stefan Fischer and Erik Mähle and Dirk Timmermann and Volker Turau},
title = {Multi-hybride Sensornetze},
pages = {141-145},
journal = {PIK - Praxis der Informationsverarbeitung und
Kommunikation},
volume = {31},
number = {3},
year = 2008,
}
Matthias Witt. Robust and Low-Communication Geographic Routing for
Wireless Ad Hoc Networks. PhD Thesis, Hamburg University of Technology, Hamburg, Germany, 2008.
@PhdThesis{Telematik_Witt_2008_Diss,
author = {Matthias Witt},
title = {Robust and Low-Communication Geographic Routing for
Wireless Ad Hoc Networks},
publisher = {Cuvillier Verlag, Göttingen, Germany},
school = {Hamburg University of Technology},
address = {Hamburg, Germany},
edition = {1st},
year = 2008,
isbn = {978-3-86727-733-4},
}
Volker Turau and Christoph Weyer. TDMA-Schemes for Tree-Routing in Data Intensive
Wireless Sensor Networks. In Proceedings of the First International Workshop on
Protocols and Algorithms for Reliable and Data Intensive Sensor
Networks (PARIS'07), October 2007. Pisa, Italy.
@InProceedings{Telematik_TW_2007_TDMASchemesTreeRouting,
author = {Volker Turau and Christoph Weyer},
title = {TDMA-Schemes for Tree-Routing in Data Intensive
Wireless Sensor Networks},
booktitle = {Proceedings of the First International Workshop on
Protocols and Algorithms for Reliable and Data Intensive Sensor
Networks (PARIS'07)},
day = {8},
month = oct,
year = 2007,
location = {Pisa, Italy},
}
Abstract:
A particular class of data intensive wireless sensor
networks are those networks where sensors periodically measure data
with high rates. The focus of this work is on the efficient transport
of high volumes of sampled data through a multi-hop network with
limited resources using a routing tree. This paper analyzes TDMA
schemes for this purpose with respect to buffer usage and energy
consumption. In particular, it is shown, that classical TDMA schemes
are not optimal for tree-routing in data-intensive sensor networks.
Matthias Witt and Volker Turau. Geographic Routing in 3D. In Proceedings of the 6th GI/ITG KuVS Fachgespräch
"Drahtlose Sensornetze" (FGSN'07), July 2007, pp. 75–78. Aachen, Germany.
@InProceedings{Telematik_WT_2007_3DRouting,
author = {Matthias Witt and Volker Turau},
title = {Geographic Routing in 3D},
booktitle = {Proceedings of the 6th GI/ITG KuVS Fachgespräch
"Drahtlose Sensornetze" (FGSN'07)},
pages = {75-78},
day = {16-17},
month = jul,
year = 2007,
location = {Aachen, Germany},
}
Abstract:
Existing geographic routing algorithms assume a
two-dimensional topology.
Dedicated wireless sensor network scenarios
demand for algorithms
that operate in three-dimensional environments.
This paper discusses
issues which arise when making the step from 2D
to 3D. Simulation
studies show that 3D routing is less efficient than
its 2D
counterpart when comparing topologies with the same average
node
degree.
Volker Turau and Christoph Weyer. Long-term Reliable Data Gathering Using Wireless Sensor
Networks. In Proceedings of the Fourth International Conference
on Networked Sensing Systems (INSS'07), June 2007, pp. 252–259. Braunschweig, Germany.
@InProceedings{Telematik_LVMHTM_2007_Long-termReliableDataGathering,
author = {Volker Turau and Christoph Weyer},
title = {Long-term Reliable Data Gathering Using Wireless Sensor
Networks},
booktitle = {Proceedings of the Fourth International Conference
on Networked Sensing Systems (INSS'07)},
pages = {252-259},
day = {6-8},
month = jun,
year = 2007,
location = {Braunschweig, Germany},
}
Abstract:
This paper presents the design of a long-term
reliable data gathering service for many-to-one communication in
wireless sensor networks: all nodes send periodically delaytolerant
data to a single node. The service operates reliably despite strict
resource constraints, poor link qualities, and frequent disconnects.
This paper presents a novel protocol for gathering periodically
measured data including a solution for the wearleveling problem of
the EEPROM. Furthermore, theoretical limits of this approach based on
available bandwidth and local memory are provided. Finally,
preliminary results of an implementation of the service are
presented. In particular a detailed analysis of the energy
consumption during the different phases of this experiment is
provided.
Volker Turau and Christoph Weyer. Scheduling Transmission of Bulk Data in Sensor Networks
using a Dynamic TDMA Protocol. In Proceedings of the International Workshop on Data
Intensive Sensor Networks (DISN'07), May 2007, pp. 321–325. Mannheim, Germany.
@InProceedings{Telematik_TW_2007_SchedulingBulkData,
author = {Volker Turau and Christoph Weyer},
title = {Scheduling Transmission of Bulk Data in Sensor Networks
using a Dynamic TDMA Protocol},
booktitle = {Proceedings of the International Workshop on Data
Intensive Sensor Networks (DISN'07)},
pages = {321-325},
day = {1},
month = may,
year = 2007,
location = {Mannheim, Germany},
}
Abstract:
Sensor networks are increasingly used for
applications in which sensors periodically measure data with high
sampling rates. The reliable transport of high volumes of sampled
data through a multi-hop network with limited resources requires
sophisticated algorithms. This paper presents a novel protocol for
this task that uses minimal energy, provides high throughput, and
requires only small amounts of additional buffer. The protocol is
based on a dynamic TDMA scheme and is robust against omission
failures.
Matthias Witt and Volker Turau. The Impact of Location Errors on Geographic Routing in
Sensor Networks. In Proceedings of the Second International Conference
on Wireless and Mobile Communications (ICWMC'06), July 2006, pp. 76. Bucharest, Romania.
@InProceedings{Telematik_WT_2006_LocationErrorRouting,
author = {Matthias Witt and Volker Turau},
title = {The Impact of Location Errors on Geographic Routing in
Sensor Networks},
booktitle = {Proceedings of the Second International Conference
on Wireless and Mobile Communications (ICWMC'06)},
pages = 76,
day = {29-31},
month = jul,
year = 2006,
location = {Bucharest, Romania},
}
Abstract:
Geographic routing in wireless sensor networks is
based on the prerequisite that every node has information about its
current position, for instance via GPS or some localization
algorithm. This location information has a certain degree of
inaccuracy in real deployments. The majority of geographic routing
algorithms, however, has been designed for nodes with exact position
information. We show that location errors yield bad performance or
even complete failures. Two elaborated geographic routing algorithms
for sensor networks, GPSR and BGR, are evaluated with the nodes
having inaccurate location information, varying the standard
deviation of the position error between zero and the transmission
range. Simulation studies show a vast decrease of the packet delivery
ratio. To enhance both algorithms, fixes for them are presented to
improve the delivery ratio and to save energy in case of location
errors.
Volker Turau, Matthias Witt and Marcus Venzke. Field Trials with Wireless Sensor Networks: Issues and
Remedies. In Proceedings of the Second International Conference
on Wireless and Mobile Communications (ICWMC'06), July 2006, pp. 86. Bucharest, Romania.
@InProceedings{Telematik_TWV_2006_FieldTrialsWSN,
author = {Volker Turau and Matthias Witt and Marcus Venzke},
title = {Field Trials with Wireless Sensor Networks: Issues and
Remedies},
booktitle = {Proceedings of the Second International Conference
on Wireless and Mobile Communications (ICWMC'06)},
pages = 86,
day = {29-31},
month = jul,
year = 2006,
location = {Bucharest, Romania},
}
Abstract:
Extensive field trials are essential to evaluate
protocols and algorithms for wireless sensor networks. The high costs
of such trials demand for a systematic approach. This paper discusses
the issues of setting up a field trial such as packaging, logging,
and deployment. Details about a concrete field trial to evaluate a
topology discovery algorithm are presented.
Matthias Witt and Volker Turau. Delivery Semantics for Geographic Routing. In Proceedings of the 5th GI/ITG KuVS Fachgespräch
"Drahtlose Sensornetze" (FGSN'06), July 2006. Stuttgart, Germany.
@InProceedings{Telematik_WT_2006_DeliverySemantics,
author = {Matthias Witt and Volker Turau},
title = {Delivery Semantics for Geographic Routing},
booktitle = {Proceedings of the 5th GI/ITG KuVS Fachgespräch
"Drahtlose Sensornetze" (FGSN'06)},
day = {17-18},
month = jul,
year = 2006,
location = {Stuttgart, Germany},
}
Abstract:
Geographic routing algorithms use locations rather
than node addresses as destinations. But since it is not always
guaranteed that there is indeed a node exactly at the destination
location, there must exist a description which nodes shall be allowed
to consume a message. In some cases, the message must not be consumed
by a node at another location (e. g., if the sink is the
destination), whereas in other cases, nodes in the vicinity may also
consume it. This has to be chosen by the application, so the routing
protocol should support different delivery semantics. Another
question is if only one node may consume the message, or if multiple
destination nodes are allowed. This paper proposes three orthogonal
delivery parameters: closeness, multiplicity, and accept-outside.
Volker Turau. Computing Bridges, Articulations, and 2-Connected
Components in Wireless Sensor Networks. In Proceedings of the Second International Workshop on
Algorithmic Aspects of Wireless Sensor Networks (ALGOSENSORS'06), July 2006, pp. 164–175. Venice, Italy.
@InProceedings{Telematik_TURAU_2006_ComputingBridgesUA,
author = {Volker Turau},
title = {Computing Bridges, Articulations, and 2-Connected
Components in Wireless Sensor Networks},
booktitle = {Proceedings of the Second International Workshop on
Algorithmic Aspects of Wireless Sensor Networks (ALGOSENSORS'06)},
pages = {164-175},
day = {15},
month = jul,
year = 2006,
location = {Venice, Italy},
}
Abstract:
This paper presents a simple distributed algorithm to
determine the bridges, articulation points, and 2-connected
components in asynchronous networks with an at least once message
delivery semantics in time O(n) using O(lg n)-length messages. The
algorithm does not assume a FIFO rule for message delivery.
Previously known algorithms either use longer messages or need more
time. The algorithm meets the requirements of wireless senor networks
and can be applied in several areas relevant to this field such as
topology control, clustering, localization and virtual backbone
calculations.
Marcus Venzke, Peng Kong and Volker Turau. A Generic Java Interface for Vertical Integration of
Wireless Sensor Networks. In Proceedings of the Fourth Workshop on Intelligent
Solutions in Embedded Systems
(WISES'06), June 2006. Vienna, Austria.
@InProceedings{Telematik_VKT_2006_VerticalIntegrationSensorNet,
author = {Marcus Venzke and Peng Kong and Volker Turau},
title = {A Generic Java Interface for Vertical Integration of
Wireless Sensor Networks},
booktitle = {Proceedings of the Fourth Workshop on Intelligent
Solutions in Embedded Systems
(WISES'06)},
day = {30},
month = jun,
year = 2006,
location = {Vienna, Austria},
}
Abstract:
The paper presents a generic, high-level Java
interface for the vertical integration of wireless sensor networks.
The intuitive interfaces are implemented in a framework that is easy
to use. The classes of the framework can be extended to meet the
requirements of a wide range of applications. In particular, the
framework supports sending packets to and receiving packets from
nodes of the sensor network. Packet types are represented as Java
classes generated from meta-data based on XML Schema. This approach
fosters short development cycles and provides the productivity needed
in vertical integration applications. The ScatterWeb platform is used
as a sample platform for sensor networks.
Volker Turau, Matthias Witt and Christoph Weyer. Analysis of a Real Multi-hop Sensor Network Deployment:
The Heathland Experiment. In Proceedings of the Third International Conference
on Networked Sensing Systems (INSS'06), June 2006, pp. 6–13. Chicago, Illinois, USA.
@InProceedings{Telematik_TWW_2006_HeathlandDeployment,
author = {Volker Turau and Matthias Witt and Christoph Weyer},
title = {Analysis of a Real Multi-hop Sensor Network Deployment:
The Heathland Experiment},
booktitle = {Proceedings of the Third International Conference
on Networked Sensing Systems (INSS'06)},
pages = {6-13},
month = jun,
year = 2006,
location = {Chicago, Illinois, USA},
}
Abstract:
This paper reports on the results and experience
gained during a real-world deployment of a sensor network based on
the ESB platform in the heathlands of Northern Germany. The goal of
the experiment was to gain a deeper insight into the problems of real
deployments as opposed to simulated networks. The focus of the
experiment was on the long- and short-term reliability of radio
links, estimation of link qualities, the influence of the link
quality on multi-hop routing, and on neighborhood exploration.
Volker Turau, Christian Renner, Marcus Venzke, Sebastian Waschik, Christoph Weyer and Matthias Witt. The Heathland Experiment: Results And Experiences. In Proceedings of the Workshop on Real-World Wireless
Sensor Networks (REALWSN'05), June 2005. Stockholm, Sweden.
@InProceedings{Telematik_TRVWWW_2005_Heathland,
author = {Volker Turau and Christian Renner and Marcus Venzke and Sebastian Waschik and Christoph Weyer and Matthias Witt},
title = {The Heathland Experiment: Results And Experiences},
booktitle = {Proceedings of the Workshop on Real-World Wireless
Sensor Networks (REALWSN'05)},
day = {20-21},
month = jun,
year = 2005,
location = {Stockholm, Sweden},
}
Abstract:
This paper reports on the experience gained during a
real-world
deployment of a sensor network based on the ESB platform in
the
heathlands of Northern Germany. The goal of the experiment was to
gain a deeper insight into the problems of real deployments as
opposed to simulated networks. The focus of this report is on the
quality of radio links and the influence of the link quality on
multi-hop routing.
Matthias Witt and Volker Turau. BGR: Blind Geographic Routing for Sensor Networks. In Proceedings of the Third Workshop on Intelligent
Solutions in Embedded Systems (WISES'05), May 2005, pp. 51–61. Hamburg, Germany.
@InProceedings{Telematik_WT_2005_BGR,
author = {Matthias Witt and Volker Turau},
title = {BGR: Blind Geographic Routing for Sensor Networks},
booktitle = {Proceedings of the Third Workshop on Intelligent
Solutions in Embedded Systems (WISES'05)},
pages = {51-61},
day = {20},
month = may,
year = 2005,
location = {Hamburg, Germany},
}
Abstract:
This paper introduces BGR, a new beacon-less
geographic routing algorithm
for wireless sensor networks. Data
packets are forwarded toward the
destination, and nodes which hear the
packet compete for becoming the
next hop. A recovery strategy is
provided for the case of empty
forwarding areas. The main innovation
is a strategy to avoid
simultaneous forwarding situations, which would
otherwise cause
packet failures. It is confirmed by simulation that
BGR sends very
few packets and is reliable in fields with sufficiently
high node
density. Furthermore, BGR is compared with similar
algorithms after
developing a general framework for beacon-less
algorithms with an
integrative terminology. Different kinds of
forwarding areas are
compared.
Volker Turau, Christoph Weyer and Matthias Witt. Ein robustes Datenmonitoring-Verfahren für
Sensornetzwerke. it - Information Technology, 47(2):63–69, April 2005.
@Article{Telematik_TWW_2005_Datenmonitoring,
author = {Volker Turau and Christoph Weyer and Matthias Witt},
editor = {Christian Becker and Pedro José Marrón},
title = {Ein robustes Datenmonitoring-Verfahren für
Sensornetzwerke},
pages = {63-69},
journal = {it - Information Technology},
volume = {47},
number = {2},
month = apr,
year = 2005,
}
Abstract:
A new data monitoring method for wireless sensor
networks is
introduced. The method combines geographic hash tables
with
in-network aggregation. Queries are processed in regions, whose
sensor nodes collect their values in nodes close to a determinated
location within the region, where they can easily be requested from
outside. The method is robust against node failures and movements and
generates very little network traffic. This is confirmed by various
simulations.
Matthias Witt, Christoph Weyer and Volker Turau. Monitoring Energy Consumption In Wireless Sensor
Networks. In Proceedings oth the Fourth GI/ITG KuVS Fachgespräch
"Drahtlose Sensornetze" (FGSN'05), March 2005. Zürich, Switzerland.
@InProceedings{Telematik_WWT_2005_Monitoring,
author = {Matthias Witt and Christoph Weyer and Volker Turau},
title = {Monitoring Energy Consumption In Wireless Sensor
Networks},
booktitle = {Proceedings oth the Fourth GI/ITG KuVS Fachgespräch
"Drahtlose Sensornetze" (FGSN'05)},
month = mar,
year = 2005,
location = {Zürich, Switzerland},
}
Abstract:
This note introduces an approach to monitor the
consumption of energy in wireless sensor networks based on video
streams composed from sequences of temperature maps. It is used to
compare and evaluate beacon-less geographic routing algorithms.
Volker Turau and Christoph Weyer. Location-aware In-Network Monitoring in Wireless Sensor
Networks. In Proceedings of the 34th Jahrestagung der
Gesellschaft für Informatik e.V. (INFORMATIK'04), Volume 2, Workshop
Sensor Networks, September 2004, pp. 355–359. Ulm, Germany.
@InProceedings{Telematik_TW_2004_InNetworkMonitoring,
author = {Volker Turau and Christoph Weyer},
title = {Location-aware In-Network Monitoring in Wireless Sensor
Networks},
booktitle = {Proceedings of the 34th Jahrestagung der
Gesellschaft für Informatik e.V. (INFORMATIK'04), Volume 2, Workshop
Sensor Networks},
pages = {355-359},
day = {20-24},
month = sep,
year = 2004,
location = {Ulm, Germany},
}
Abstract:
This paper presents a data-centric and location-aware
procedure to
perform in-network evaluation of queries in sensor
networks. The
algorithm is a hybrid of geographic hash tables and
in-network
aggregation. It increases data availability and accounts
for topology
changes and generates mostly local network traffic.
Students' theses
Completed Theses
- Analysing human running styles with an embedded system containing accelerometers
- Rent-A-Sensor: A Support Platform for Conducting Sensor Networks Experiments in a Shared Environment
- Temperature Modeling of Energy Buffers for Wireless Sensor Nodes
- Evaluation and Comparison of Prediction Models for a Solar Energy Harvester
- Programming Self-Stabilizing Algorithms in Real Sensor Network Deployments
- Development Support for Energy-aware Debugging
- Mahalle: Connectivity-Aware Neighborhood Management Protocol for Wireless Sensor Networks
- Autonomous Power-Supply Based on Solar Cells and Supercapacitors for Wireless Sensor Nodes
- Entwurf eines Hardwareadapters zur Strommessung von drahtlosen Sensorknoten
- Energy-Efficient TDMA Schedules for Data-Gathering in Wireless Sensor Networks