Sensorlab / Publications


Carolina Fortuna
Dynamic Composition of Communication Services
PhD thesis, MPS, Ljubljana, Slovenia.

In this thesis, we look at networking functionality as a set of services which can be composed dynamically. We argue that the dynamic composition of communication services can speed up design and experimentation with new protocol stacks. The reference Open Systems Interconnect (OSI) architecture of communication networks splits network functionality into layers, each providing a service to the layer above. The modularity provided by the OSI layered abstraction is further split in our approach by looking also at layers as a set of services.

In order to substantiate our claim, we propose a conceptual framework for quick and efficient prototyping and deployment of modular protocol stacks as a composition of communication services, and its reference implementation ProtoStack. The proposed framework consists of four components: the physical testbed, the module library, the declarative language and the workbench. The physical testbeds that ProtoStack, as the reference implementation, can support have to be based on hardware platforms which can host Contiki operating system. The module library used by ProtoStack is called Composeable Rime (CRime). The declarative language is based on the Resource Description Framework (RDF) and uses a custom built vocabulary. The workbench is a web based portal which allows easy, graphically supported configuration of a stack from the available CRime modules.

We show, through feedback collection from first time users, that the ProtoStack tool can significantly speed up prototyping and testing of new stacks and is friendly to novice and advanced users. The initial feedback shows that the tool can speed up design and prototyping of new protocol stack by at least a factor of 2. The cost of increased flexibility and prototyping speed of the protocol stack is paid in terms of increased memory footprint, processing speed and energy consumption. The CRime library used by ProtoStack has a 16% larger footprint, it takes 2.4 times longer to execute an open->send->recv->close sequence and consumes 1.6% more power in doing so. Even though with ProtoStack more resources are consumed by the node, the tradeoff in terms of prototyping speed seems to pay off.

The last part of the thesis discusses service oriented networks (SON) and cognitive networks (CN) and how the dynamic composition of communication services can be used to further research in this area. Particularly, we show on selected use cases how ProtoStack can be used to design and experiment with SONs and CN. The thesis ends with conclusions and a brief discussion identifying future work.

Topic: system
Type: thesis
Download: PDF | PPT


As part of activities in the FP7 CREW project the Department of Communication Systems at JSI installed two VESNA SNE-ESTHER devices in London. SNE-ESHTER is a radio receiver for the UHF band designed at JSI based on the VESNA sensor platform. Installed devices will be used for advanced spectrum sensing, contributing to the large scale Ofcom TV White Spaces pilot. One device was installed on the roof of a building in the King's College London Strand campus and the other on the roof of Queen Mary University London. Long term measurements will be used to support the experimentation with advanced, so called cognitive radio devices, as secondary users in currently unused parts of the spectrum.

Marko Pesko, Miha Smolnikar, Matevz Vucnik, Tomaz Javornik, Milica Pejanovic-Djurisic and Mihael Mohorcic published a paper titled "Smartphone with augmented gateway functionality as opportunistic WSN gateway device" in Wireless Personal Communications journal. They described how a Samsung phone connected via Bluetooth to a VESNA sensor node can act as a gateway to a wireless sensor network.

Chapter "Low-cost testbed development and its applications in cognitive radio prototyping" written by our colleagues Tomaž Šolc, Carolina Fortuna and Mihael Mohorcic has been published by Springer in the book  "Cognitive Radio and Networking for Heterogeneous Wireless Networks" from the Recent Advances and Visions for the Future series.

Jernej and Klemen talked with Nickola Naous about our new VESNA sensor node design. Read about The engineers behind the WSN Vesna on the IoTMonkey blog.

The CREW project entered a continuous open access phase. You can test your cognitive radio networking solution on 5 differrent testbed islands and advanced radio components, including our LOG-a-TEC testbed and the VESNA sensor network platform.

In cooperation with Adria Mobil we are developing a motorhome for the future. Adria Moving Lab is equipped with intelligent sensors that allow the vehicle to adapt to its user. This way we can optimize the use of consumables like fuel and water and exploit renewable sources of energy like solar power. The prototype has been unveiled at the Institute Jožef Stefan open days in April 2014.

Our paper "Trends in the development of communication networks: Cognitive networks" is the 10th among the 25th most cited articles published since 2009, extracted from Scopus, see all on the Elsevier web site.

Check the "Cognitive radio experimentation with VESNA platform" presentation by Miha Smolnikar at the School on Applications of Open Spectrum and White Spaces Technologies.

We are looking for a C programmers that would join the team developing the VESNA platform. Candidates that have previous experience with electronic circuit design, operating systems or open source projects will have priority.


We are constantly open for talented, open minded and hard working undergraduate students, interns and MSc/PhD candidates. Read more.

[ more highlights ]


Dynamic composition of communication services

Carolina Fortuna

Orchestrating Virtual Wireless Networks from Shared Resource Pools
Luiz DaSilva

VESNA in Kognitivni Radio

Tomaž Šolc

[ more videolectures ]


SensorNetwork testbed
Mash-up demo.


GSN demo

[ more demos ]

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