Jochen Koberstein

• Kiel University

In this case study we show how four topography-independent radio models (models not regarding individual obstacles in the operations area) can be "tuned" such that the outcomes of an event-driven network simulator come as close as possible to reference data obtained in a real-world radio network experiment. An evolutionary optimization process was...

Mobile ad-hoc networks (MANETs) and especially mobile Wireless Sensor Networks (mWSNs) are embedded in the environment and therefore stand under strong influence of its specific characteristics. Beside e.g. sensor input, nodes motion patterns are supposed to be a very basic factor regarding performance. Hence simulations may need to account scenari...

Software development for Wireless Sensor Networks (WSNs) suffers from the adverse condition that WSN software systems can usually not be tested on a system-level in their final operations environment, as WSN deployment is an expensive and time-consuming process. Several authors therefore propose to interlock application software test tightly with s...

Positioning sensor nodes requires distance information to reference points. Due to resource limitations in sensor networks, distance determination in low-cost sensor nodes without additional hardware is difficult. Known techniques such as distance estimation based on received signal strength (RSSI) are mostly inaccurate or have limitations. We prop...

In sensor networks [ASSC02] - and also other environments with small devices - the classical client/server co-operation paradigm does no longer seem to be adequate for a number of reasons: (1) Sensor nodes communicate via unreliable wireless media

We show a novel middleware approach for pervasive applications that communicate via an XML-based distributed virtual shared information space. This approach extends some common ideas on XML language binding frameworks by a dedicated "merge logic" that lets pervasive devices share their information with low overhead.

In this paper, we assume that sensor nodes in a wireless sensor network cooperate by posting their information to a distributed virtual shared information space that is built on the basis of advanced XML technology. Using a flooding protocol to maintain the shared information space is an obvious solution, but flooding must be tightly controlled, be...

In sensor networks [ASSC02] - and also other environments with small devices - the classical client/server co-operation paradigm does no longer seem to be adequate for a number of reasons: (1) Sensor nodes communicate via unreliable wireless media

In this paper we present a novel approach to information centric application development for wireless sensor networks acting as a swarm. We introduce the concept of a distributed virtual shared information space based on XML that makes use of a content based forwarding mechanism we call XCast for information sharing between devices and cardinally c...