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- Boano, Carlo Alberto, et al.
(författare)
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IoTBench: Towards a Benchmark for Low-power Wireless Networking
- 2018
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Ingår i: 2018 1ST IEEE WORKSHOP ON BENCHMARKING CYBER-PHYSICAL NETWORKS AND SYSTEMS (CPSBENCH 2018). - 9781538667422 ; , s. 36-41
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Konferensbidrag (refereegranskat)abstract
- Unlike other fields of computing and communications, low-power wireless networking is plagued by one major issue: the absence of a well-defined, agreed-upon yardstick to compare the performance of systems, namely, a benchmark. We argue that this situation may eventually represent a hampering factor for a technology expected to be key in the Internet of Things (IoT) and Cyber-physical Systems (CPS). This paper describes a recent initiative to remedy this situation, seeking to enlarge the participation from the community.
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- Guna, Stefan T., et al.
(författare)
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DICE : Monitoring global invariants with wireless sensor networks
- 2014
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Ingår i: ACM transactions on sensor networks. - : Association for Computing Machinery. - 1550-4867 .- 1550-4859. ; 10:4
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Tidskriftsartikel (refereegranskat)abstract
- Wireless sensor networks (WSNs) enable decentralized architectures to monitor the behavior of physical processes and to detect deviations from a specified "safe" behavior, for example, to check the operation of control loops. Such correct behavior is typically expressed by global invariants over the state of different sensors or actuators. Nevertheless, to leverage the computing capabilities of WSN nodes, the application intelligence needs to reside inside the network. The task of ensuring that the monitored processes behave safely thus becomes inherently distributed, and hence more complex. In this article we present DICE, a system enabling WSN-based distributed monitoring of global invariants. A DICE invariant is expressed by predicates defined over the state of multiple WSN nodes, such as the expected state of actuators based on given sensed environmental conditions. Our modular design allows two alternative protocols for detecting invariant violations: both perform in-network aggregation but with different degrees of decentralization, therefore supporting scenarios with different network and data dynamics. We characterize and compare the two protocols using large-scale simulations and a real-world testbed. Our results indicate that invariant violations are detected in a timely and energy-efficient manner. For instance, in a 225-node 15-hop network, invariant violations are detected in less than a second and with only a few packets sent by each node.
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- McCann, Julie A., et al.
(författare)
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Connected Things Connecting Europe
- 2019
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Ingår i: Communications of the ACM. - : Association for Computing Machinery (ACM). - 0001-0782 .- 1557-7317. ; 62:4, s. 46-51
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Tidskriftsartikel (refereegranskat)
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| 9. |
- Mottola, Luca, et al.
(författare)
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Electronically-switched Directional Antennas for Low-power Wireless Networks: A Prototype-driven Evaluation
- 2012. - 8
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- We study the benefits of electronically-switched directional antennas in low-power wireless networks. This antenna technology may improve energy efficiency by increasing the communication range and by alleviating contention in directions other than the destination, but in principle requires a dedicated network stack. Unlike most existing works, we start by characterizing a real-world antenna prototype, and apply this to an existing low-power wireless stack, which we adapt with minimal changes. Our results show that: i) the combination of a low-cost directional antenna and a conventional network stack already brings significant performance improvements, e.g., nearly halving the radio-on time per delivered packet; ii) the margin of improvement available to alternative clean-slate protocol designs is similarly large and concentrated in the control rather than the data plane; iii) by artificially modifying our antenna's link-layer model, we can point at further potential benefits opened by different antenna designs.
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- Mottola, Luca, et al.
(författare)
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Middleware for Wireless Sensor Networks: An Outlook
- 2012. - 9
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Ingår i: International Journal of Internet Services and Applications. ; 3, s. 31-39
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Tidskriftsartikel (refereegranskat)abstract
- In modern distributed computing, applications are rarely built directly atop operating system facilities, e.g., sockets. Higher-level middleware abstractions and systems are often employed to simplify the programmer’s chore or to achieve interoperability. In contrast, real-world wireless sensor network (WSN) applications are almost always developed by relying directly on the operating system. Why is this the case? Does it make sense to include a middleware layer in the design of WSNs? And, if so, is it the same kind of software system as in traditional distributed computing? What are the fundamental concepts, reasonable assumptions, and key criteria guiding its design? What are the main open research challenges, and the potential pitfalls? Most importantly, is it worth pursuing research in this field? This paper provides a (biased) answer to these and other research questions, preceded by a brief account on the state of the art in the field.
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