Links
List of related publications
List of implemented modules

Various module boards can be stacked on a sensor network node.

Wireless Sensor Networks (WSN)

WSN are a group of distributed specialized sensors to monitor physical or environmental conditions, such as temperature, humidity, pressure, vibration intensity etc. Sensors cooperatively pass their data through the network to a main location. The WSN consists of "nodes", which are small and portable. Each node is connected to one or more sensors.

In the WNL WSN project, a Wireless Sensor and Actor Network (WSAN) node with required functionality is built out of Plug&Play hardware module boards containing various power supply units, wired/wireless transceivers, sensors, actuators, peripheral devices (e.g. external memory, security accelerators). The module boards are stacked on top of each other.

Once started, the modular node identifies attached modules and obtains the required drivers and applications from the WSAN. The operation of a node is optimized based on the available modules, resources and current needs of the network and applications.

modwsn_concept

A new node establishes connection in two phases. First, a node uses the basic communication driver to establish the basic peer-to-peer link to a node already in WSAN. Through this connection, the new node reaches the special resource broker (RB) and obtains from it the application software and the drivers for its peripherals, including the extended driver for wireless communication, which is taken into use at the second phase. The resource broker might act either as a resource-rich WSAN node or as a remote server accessible over Internet.

modnwk_structure

Current Research Topics

The main focus of the WNL research group is on Wireless Sensor Networks, but projects are ongoing also on related and supporting topics such as

  • Bluetooth Low Energy (Smart)
  • Short range wireless radios: UWB/802.15.4a, Sub 1GHz, etc.
  • Wake-Up Receivers
  • Wireless Energy Transfer
  • Energy Harvesting
  • Wide Area IoT