SIGNET - Special Interest Group on NETworking
Our lab is the place where most of our research activities are tested through simulation (ns2, own developed code) as well as experiments (sensor nodes and mesh network). The main activities carried out within the lab are:
- Design and experimentation of networking protocols for wireless sensor networks
- Localization and tracking through wireless sensor networks
- Design of network protocols for wireless mesh networks
- Research on cognitive networking
- Research on Network coding for wireless and distributed storage systems
- Research on Cross-Layer Design of MIMO Ad Hoc Networks
- Research on cooperative networking, HARQ systems
- Development of tools for simulation (e.g., ns2) and analysis of collected data
Each member of the group is required to periodically report on his/her activity to the group, by giving a talk at one of the SIGNET weekly meetings. You can find a list of talks here.
It is a 10m x 11m laboratory located within the department of information engineering (DEI), University of Padova, on the first floor of building DEI/G. A permanent wireless sensor network (WSN) testbed is deployed within the lab, on a grid suspended 60cm from the ceiling and 2.4m above the floor. The WSN is made up of 48 Tmote Sky sensor nodes, which are separated 160cm in one direction and 120 in the other direction. These distances where chosen to provide a uniform distribution of the nodes in the lab. The sensor network testbed is managed through a own developed WSN Testbed and Interactive Management Tool. For more information on the sensor testbed see our Tridentcom2007 paper.
Phone contact: +39 049 827 7777
Networking wireless sensor networks
Applied research on WSNs: in the lab we have 100+ Tmote Sky nodes (same as TelosB nodes) having an IEEE 802.15.4 2420 Chipcon wireless transceiver working at 2.4 GHz and allowing a maximum data rate of 250 Kbps. These sensors feature an MSP430 micro controller with 10 KB on chip RAM, 48 KB of internal flash, and an external flash memory of 1 MB. In addition, we have 100+ EYES IFXv2 nodes (similar characteristics but lower bitrate of 19900 Kbps).
Applied research on mesh networking: we are currently using CalRadio and CalMesh nodes to conduct experimental research on wireless mesh networking. This research activity is carried out in cooperation with Calit2.
CalRadio I is the first generation of nodes. It provides a simple, low-cost platform for 802.11b development from the MAC layer and up. All MAC functionalities are written in ‘C’ code that runs on a DSP. The Intersil (Conexant) Prism chip set is used for the physical layer. Additionally, a C5471 TI DSP contains an ARM processor, which hosts a lightweight Open Linux operating kernel providing easy access to programming, downloading and monitoring of data.
CalMesh nodes (see picture above) use IEEE 802.11b-based Wi-Fi technology to easily set up ad hoc networks. These nodes can also host GPRS/EDGE/UMTS NICs and can behave as gateways to the fixed Internet infrastructure. They support a number of networking features such as: DHCP/DNS/NAT, Internet gateway node discovery mechanism, load balancing among gateways, automatic mesh formation, etc.