HOTEMNETS

The availability of multiple frequency channels on modern radios has provided a way to improve networking performance. Nevertheless, current multi-channel protocols lack the architectural consistency and flexibility to support a diverse set of ...

Today more and more wireless sensors are powered by batteries. To avoid frequent battery replacement and to provide easy maintenance, sensor nodes should operate energy-efficiently. One well-known and significant source of energy drainage is radio idle ...

The resource demands of today's wireless mesh networking stacks hinder the progress of low-cost, low-power wireless sensor nodes. Optimizing wireless sensors means reducing costs, increasing lifetimes, and locating sensors close to the action. Adding ...

Office buildings contain large sensor network deployments to monitor and maintain their internal environment. They also consume a significant amount of energy. This paper proposes the use of the use of horizontal layering, rather than the current ...

In this paper we develop algorithms and hardware for the autonomous gathering of cattle. We present a comparison of three different autonomous gathering algorithms that employ sound and/or electric stimuli to guide the cattle. We evaluate these ...

Wireless Sensor Networks have been deployed for environmental monitoring, home automation, and advanced metering application fields among others. Only few examples of monitoring cargo transports by Wireless Sensor Networks have been reported on. The ...

This paper discusses our experience in designing and deploying a 994-node sensor network to measure the social contact network of a high school over one typical day. The system aims to capture interactions of human subjects for the study of infectious ...

There is a long-standing dispute on whether and when thread-based programming should be preferred over the event-based paradigm. This dispute has also extended into the wireless sensor networks domain. Many existing operating systems rely on events due ...

We address the problem of analysing performance anomalies in sensor networks. In this paper, we propose an approach that uses the local flash storage of the motes for logging system data, in combination with online statistical analysis. Our results show ...

We study the suitability of IPv6/6LowPan protocols under heterogeneous traffic loads in environmental sensor networks: microclimate nodes generating periodic but low-bandwidth data, while multimedia nodes generating high-bandwidth data streams on demand,...

Cluster transmission, also called Concurrent Cooperative Transmission (CCT) in this paper, enables a collection of power-constrained embedded sensors to transmit as a group and achieve a transmit range that is much greater than the range of a single ...

The IEEE 802.15.4 beacon-enabled mode provides for energy savings through synchronization of active and sleep periods. Recent research proposes to employ adaptive duty cycling schemes in conjunction with active/sleep synchronization to reduce the ...

Today, RF based indoor node localization and tracking techniques predominantly rely on received signal strength (RSS), proximity information, or some sort of a priori mapping of the RF environment. However, due to nonideal RF propagation caused by ...

To ensure a long lifetime, sensor networks must operate with a low duty cycle, but the duty cycle must be high enough for the network to handle expected peak traffic loads. Being dimensioned for peak traffic rather than regular traffic leads to shorter ...

We present a modular sensor network platform capable of supporting a wide range of applications. We developed a platform to support a broad spectrum of scenarios, instantiating our system for applications on the ground, in the water, and in the air. Our ...

Wireless Sensor Network (WSN) software is typically organized as a set of modules and depending on the application only necessary modules are selected, compiled and installed on a sensor node. This software flexibility is currently not matched by ...

There has been considerable interest in energy harvesting for wireless sensor networks. Energy harvesting from thermal sources such as body heat and mechanical sources such as human motion have been proposed. There are also sensor network systems that ...