Riccardo Tomasi | Istituto Superiore Mario Boella (original) (raw)

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Papers by Riccardo Tomasi

This paper presents a demonstrator of a multi-hop 6LoWPAN provided with frequency-agility extensi... more This paper presents a demonstrator of a multi-hop 6LoWPAN provided with frequency-agility extensions. A reference architecture is presented along with the basic components introduced to build a distributed spectrum sensing and interference resolution service in a multi-hop environment. Moreover, a frequency-agility management plane is proposed for the 6LoWPAN communication stack. The proposed solution is implemented in a small-scale network adopting TinyOS and an open-source implementation of 6LoWPAN protocol stack. The resulting demonstrator proves the capability of the proposed system to characterize the spectrum occupancy state in a multi-hop environment. In addition, it shows the ability of the network to reallocate to the best available channel in case a critical level of interference is detected on the current operating channel.

Abstract Information and Communication Technologies (ICT) are considered a key instrument to impr... more Abstract Information and Communication Technologies (ICT) are considered a key instrument to improve efficiency and flexibility of industrial processes. This paper provides an experience report about the application of an ICT-based approach, derived from the ...

This paper describes a real experience of industrial monitoring realized with WSN technology. By ... more This paper describes a real experience of industrial monitoring realized with WSN technology. By adopting Telos platforms, we built a WSN in which a gateway node collects monitoring data coming from some probe nodes. We present our TinyOS design developed to realize the application and to meet its requirements. The implementation of a reliable radio communication protocol and the integration of an external probe with a Telos node have been the most challenging activities. Numerous trials have been conducted to successfully verify the long-term application stability when a few probe nodes are involved. A brief discussion on a possible extension solution in order to cope with a large number of nodes is provided too.

This chapter presents a multihop routing solution, called Hopefully Longest Jump First, specifica... more This chapter presents a multihop routing solution, called Hopefully Longest Jump First, specifically proposed for WSNs arranged in a linear topology and compares it to two simple approaches, named Single Hop and Limited Flooder. At the application level, we suppose that a Master Node, deployed at one side of the WSN, progressively queries each of the N Slave Nodes. On its turn, when queried, a Slave Node replies to the Master Node. The performance of the proposed routing schemes is evaluated and compared on the basis of experimental results involving a real indoor WSN composed of 11 Telos motes, representing 1 Master Node and 10 Slave Nodes. The WSN has been deployed inside ISMB Lab. The analysis is based on performance metrics such as end-to-end delay and end-to-end packet delivery success rate, also considering the impact of the distance between two adjacent nodes and thus the expected number of neighbors within a node radio coverage.

Frequency agility is considered as an indispensable feature of next-generation wireless sensor ne... more Frequency agility is considered as an indispensable feature of next-generation wireless sensor networks (WSNs), which will have to cope with highly interfered environments due to the increasing diffusion of wireless devices operating in unlicensed bands. In this paper we investigate some design aspects related to spectrum sensing in “cognitive” WSNs, relating the duration of sensing time to the probability of error in channel selection and analyzing the tradeoff between sensing duration and average throughput. Results are based on a realistic model, consistent with previous experimental works and existing testbeds.

IEEE Sensors Journal, 2012

In this paper we propose an integration of dynamic channel allocation capabilities, typical of co... more In this paper we propose an integration of dynamic channel allocation capabilities, typical of cognitive radio networks, in wireless sensor networks based on IPv6 protocol. We analyze the fundamental aspects of the proposed frequency-agile wireless sensor networks, including spectrum sensing, channel selection, network architecture, extensions of the IPv6 stack, and system operation. We then present a complete implementation of a

This demonstrator showcases a distributed spectrum sensing and channel selection service running ... more This demonstrator showcases a distributed spectrum sensing and channel selection service running on a small-scale IEEE 802.15.4 opportunistic WPAN network. This service can provide spectrum awareness to the network itself or to other co-located networks. In case an interfering signal is detected the network devices are able to identify less used spectrum portions such that the network can reallocate to

IEEE Transactions on Information Technology in Biomedicine, 2011

Monitoring technologies leveraging on heterogeneous sensor networks are becoming increasingly imp... more Monitoring technologies leveraging on heterogeneous sensor networks are becoming increasingly important in almost every application scenario where pervasive data collection is needed. In current sensor networks deployments, many low-level protocols and functions details dependent on used network technology are explicitly handled at application level, in a cross-layer fashion. This is not a critical issue in homogeneous networks, where services are

IEEE Sensors Journal, 2012

IEEE Transactions on Information Technology in Biomedicine, 2011