Worldsens: Development and Prototyping Tools for Application Specific Wireless Sensors Networks

Abstract

In this paper we present Worldsens, an integrated environment for development and rapid prototyping of wireless sensor network applications. Our environment relies on software simulation to help the designer during the whole development process. The refinement is done starting from the high level design choices down to the target code implementation, debug and performance analysis. In the early stages of the design, high level parameters, like for example the node sleep and activity periods, can be tuned using WS-Net, an event driven wireless network simulator. WSNet uses models for applications, protocols and radio medium communication with a parameterized accuracy. The second step of the sensor network application design takes place after the hardware implementation choices. This second step relies on the WSim cycle accurate hardware platform simulator. WSim is used to debug the application using the real target binary code. Precise performance evaluation, including real-time analysis at the interrupt level, are made possible at this low simulation level. WSim can be connected to WSNet, in place of the application and protocol models used during the high level simulation to achieve a full distributed application simulation. WSNet and WSNet+WSim allow a continuous refinement from high level estimations down to low level real-time validation. We illustrate the complete application design process using a real life demonstrator that implements a hello protocol for dynamic neighborhood discovery in a wireless sensor network environment.

Energy Efficient Mobile Routing in Actuator and Sensor Networks with Connectivity Preservation

“…We use WSNet/Worldsens [7] eventdriven simulator for large scale wireless sensor networks, that assumes 802.11 DCF MAC layer, free space propagation model and packet collisions. For simulation purpose we assume that nodes are uniformly distributed over a 1000×1000 square and can adapt their range between 0 and R = 150.…”

Geographic Routing with Partial Position Information

“…Simulations have been performed using WS-NET (Fraboulet et al, 2007) simulator. Each simulation lasts for 10 minutes.…”

A dual-core system solution for wearable health monitors

“…In a second scenario, the data processing part is off-loaded to the BioASIP, while the MSP430 is controlling the system. To enable a welldefined comparison between both systems, use is made of the WSim emulator [9]. WSim is a full platform hardware emulator able to use target binary code as simulation input and a model description of the embedded hardware components.…”

“…An ECG R-peak detection application based on continuous wavelet transform (ECG CWT [3]) is used to verify the merits of the proposed system architecture. For the analysis, we use measurement results in a system-level modelling and simulation tool (WSim [9]). The document is structured as follows.…”