- About CREW
- Open Calls
Short testbed description
The TKN Wireless Indoor Sensor Network Testbed (TWIST) is a multi-platform, hierarchical sensornetwork testbed architecture developed at the Technische Universität Berlin. One instance is currently deployed at TUB campus: a total of 204 sensor nodes (102 eyesIFX and 102 Tmote Sky nodes) are distributed in a 3D grid spanning 3 floors of an office building, resulting in more than 1500 m² of instrumented office space. Two nodes of each platform are deployed, while the larger ones (~28 m²) have four nodes.
Various experiments can be performed using the TWIST infrastructure, for example:
- Investigating different RF interference detection techniques, e.g. distributed vs. centralized detection.
- Exploring different interference mitigation techniques, such as frequency hopping or adaptive power control.
- Studying spatial distribution of RF interference in an office environment via RF interference maps.
Experimenters may also couple the TWIST testbed with mobile sensor nodes (carried on a human subject or by a mobile robot) or spectrum analyzers in order to, for example, investigate:
- Cooperation between fixed infrastructure and mobile body area networks (investigating network discovery, handover, etc.)
- Comparison of in-network interference detection with other (external) spectrum sensing equipment
TWIST is accessed via a web-interface. Experimenters can install their firmware on one or more sensor nodes, receive status information, download experiment traces, and interact with individual nodes during an experiment over an SSH connection. The mobile robot can only be accessed locally.
Getting started and user documentationAccess the complete documentation
Short testbed description
The w-iLab.t allows flexible testing of the functionality and performance of wireless networking protocols and systems in a time-effective way, by providing hardware and the means to install and configure firmware and software on (a selection of) nodes, schedule automated experiments, and collect, visualize and process results. Thanks to an in-house designed hardware control device, unique features of the testbed include the triggering of repeatable digital or analog I/O events at the sensor nodes, real-time monitoring of the power consumption, and battery capacity emulation.
A wide range of experiments is possible. Below, only examples of cognitive networking experiments are presented.
- Interference avoidance in the 2.4 GHz ISM band: activate a subset of nodes (both sensor nodes using 802.15.4 and Wi-Fi nodes. Implement interference avoidance protocols on top of the sensor node and/or Wi-Fi node. Check the impact on the spectrum using the imec sensing engines installed in the testbed.
- Distributed via centralized sensing approaches: compare the difference between different sensing algorithms, e.g. installed on sensor nodes
- Performance of low-cost sensing modules: find out how accurate RSSI readings collected by sensor nodes are when implementing a certain channel-sampling algorithm on top of these nodes. Compare this with the performance of high-end sensing solutions, based e.g. on USRPs or imec sensing devices located in the same environment.
Experimenters may use (= install firmware, code, software, images,... on one or more nodes, view status, download results,...) the testbed remotely via an OpenVPN connection over the internet. Most interactions are performed via a web interface, although direct connections to devices over SSH is also possible.
The testbeds at both locations (Office, Zwijnaarde) are accessible 24/7, with the restriction that Wi-Fi experiments are not allowed at the Office location during office hours. Usage is bound to a negotiable quota in function of the type and amount of infrastructure needed.
Please check the basic w-iLab.t tutorial for details on how to get an account.
- General introduction movie to the w-iLab.t
- After applying for an account, a set of tutorials is offered to get you started right away.