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  • 51.
    Narayana, S.
    et al.
    TU Delft, Netherlands.
    Rao, V.
    TU Delft, Netherlands.
    Prasad, R. V.
    TU Delft, Netherlands.
    Kanthila, A. K.
    TU Delft, Netherlands.
    Managundi, K.
    TU Delft, Netherlands.
    Mottola, Luca
    RISE Research Institutes of Sweden, Digitala system, Datavetenskap.
    Prabhakar, T. V.
    IISc,India.
    LOCI: privacy-aware, device-free, low-power localization of multiple persons using IR sensors2020Ingår i: Proceedings - 2020 19th ACM/IEEE International Conference on Information Processing in Sensor Networks, IPSN 2020, Institute of Electrical and Electronics Engineers Inc. , 2020, s. 121-132Konferensbidrag (Refereegranskat)
    Abstract [en]

    High accuracy and device-free indoor localization is still a holy grail to enable smart environments. With the growing privacy concerns and regulations, it is necessary to develop methods and systems that can be low-power, device-free as well as privacy-aware. While IR-based solutions fit the bill, they require many modules to be installed in the area of interest for higher accuracy, or proper planning during installation, or they may not work if the background has multiple heat-emitting objects, etc. In this paper, we propose a custom-built miniature device called LOCI that uses IR sensing. One unit of LOCI can provide three-dimensional localization at best. LOCI uses only a thermopile and a PIR sensor built within a 5x5x2 cm3 module. Since IR-based sensing is used, LOCI consumes around 80 mW. LOCI uses analog waveform from the PIR sensor with the gain of the PIR sensor dynamically controlled through software in real-time to simulate spatial diversity. LOCI proposes low-complexity techniques with sensor fusion to eliminate the noise in the background, which has not been handled in previous works even with sophisticated signal processing techniques. Since LOCI uses raw data from the thermopile, the computations are power-efficient. We present the complete design of LOCI and the proposed methodology to estimate height and location. LOCI achieves accuracies of sub-22 cm with a confidence of 0.5 and sub-35 cm with a confidence of 0.8. The best-case location accuracy is 12.5 cm. The accuracy of height estimation is within 8 cm in majority cases. LOCI can easily be extended to recognize activities. 

  • 52.
    Oppermann, Felix Jonathan
    et al.
    Graz University of Technology, Austria.
    Römer, Kay
    Graz University of Technology, Austria.
    Mottola, Luca
    RISE., Swedish ICT, SICS. Politecnico di Milano, Italy; .
    Picco, Gian Pietro
    University of Trento, Italy.
    Gaglione, Andrea
    Imperial College London, United Kingdom.
    Design and compilation of an object-oriented macroprogramming language for wireless sensor networks2014Ingår i: Proceedings - Conference on Local Computer Networks, LCN, IEEE Computer Society , 2014, nr November, s. 574-582Konferensbidrag (Refereegranskat)
    Abstract [en]

    Wireless sensor network (WSN) programming is still largely performed by experts in a node-centric way using low-level languages such as C. Although numerous higher-level abstractions exist, each simplifying a specific aspect of distributed programming, real applications often require to combine multiple abstractions into a single program. Using current programming frameworks, this represents a difficult task. In previous work, we therefore defined a conceptual framework that facilitates abstraction composition by defining sound compositional rules among few fundamental abstraction categories. The framework is extensible: programmers can add new abstractions within the boundaries determined by the compositional rules. In this paper we describe the design of a language - called MPL - that instantiates this conceptual framework. To support the extensible nature of the framework, the language is object-oriented, which allows programmers to add new abstractions by inheriting from existing classes that implement predefined interfaces. We modeled the syntax after Java, to make it more palatable to inexperienced embedded programmers. Compared to Java, we modified the language to enable efficient execution on WSN devices. We designed and implemented a compiler that translates MPL language into executable C code, which spares the overhead of a virtual machine. By comparing MPL implementations against functionally-equivalent Contiki/C implementations of several benchmark applications, we determined that the performance overhead of MPL is limited, and yet the programming task is simplified.

  • 53. Pasztor, Bence
    et al.
    Mottola, Luca
    RISE., Swedish ICT, SICS, Computer Systems Laboratory.
    Mascolo, Cecilia
    Picco, G. P.
    Elwood, Stephen
    Macdonald, David
    Selective Reprogramming of Mobile Sensor Networks through Social Community Detection2010Konferensbidrag (Refereegranskat)
  • 54. Samarasinghe, Kasun
    et al.
    Voigt, Thiemo
    RISE., Swedish ICT, SICS, Computer Systems Laboratory.
    Mottola, Luca
    RISE., Swedish ICT, SICS, Computer Systems Laboratory.
    Roedig, Utz
    Poster Abstract: Network Coding with Limited Overhearing2011Konferensbidrag (Refereegranskat)
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  • 55.
    Shen, Qianyao
    et al.
    KTH Royal Institute of Technology, Sweden.
    Mahima, KTY
    University of Colombo, Sri Lanka.
    de Zoysa, Kasun
    University of Colombo, Sri Lanka.
    Mottola, Luca
    RISE Research Institutes of Sweden, Digitala system, Datavetenskap. Uppsala University, Sweden.
    Voigt, Thiemo
    RISE Research Institutes of Sweden, Digitala system, Datavetenskap. Uppsala University, Sweden .
    Flierl, Markus
    KTH Royal Institute of Technology, Sweden.
    CNN-Based Estimation of Water Depth from Multispectral Drone Imagery for Mosquito Control2023Ingår i: 2023 IEEE International Conference on Image Processing (ICIP), Institute of Electrical and Electronics Engineers (IEEE), 2023, s. 3250-3254Konferensbidrag (Refereegranskat)
    Abstract [en]

    We present a machine learning approach that uses a custom Convolutional Neural Network (CNN) for estimating the depth of water pools from multispectral drone imagery. Using drones to obtain this information offers a cheaper, timely, and more accurate solution compared to alternative methods, such as manual inspection. This information, in turn, represents an asset to identify potential breeding sites of mosquito larvae, which grow only in shallow water pools. As a significant part of the world’s population is affected by mosquito-borne viral infections, including Dengue and Zika, identifying mosquito breeding sites is key to control their spread. Experiments with 5-band drone imagery show that our CNN-based approach is able to measure shallow water depths accurately up to a root mean square error of less than 0.5 cm, outperforming state-of-the-art Random Forest methods and empirical approaches.

  • 56. Silase Geletu, Biruk
    et al.
    Mottola, Luca
    RISE., Swedish ICT, SICS, Computer Systems Laboratory.
    Voigt, Thiemo
    RISE., Swedish ICT, SICS, Computer Systems Laboratory.
    Österlind, Fredrik
    RISE., Swedish ICT, SICS.
    Poster Abstract: Modeling an Electronically Switchable Directional Antenna for Low-power Wireless Networks2011Konferensbidrag (Refereegranskat)
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  • 57.
    Singhal, Chetna
    et al.
    Indian Institute of Technology, India.
    Voigt, Thiemo
    RISE Research Institutes of Sweden, Digitala system, Datavetenskap. Uppsala University, Sweden.
    Mottola, Luca
    RISE Research Institutes of Sweden, Digitala system, Datavetenskap. Uppsala University, Sweden; Politecnico di Milano, Italy.
    Application-aware Energy Attack Mitigation in the Battery-less Internet of Things2023Ingår i: MobiWac 2023: Proceedings of the International ACM Symposium on Mobility Management and Wireless Access, Association for Computing Machinery, Inc , 2023, s. 35-43Konferensbidrag (Refereegranskat)
    Abstract [en]

    We study how to mitigate the effects of energy attacks in the battery-less Internet of Things∼(IoT). Battery-less IoT devices live and die with ambient energy, as they use energy harvesting to power their operation. They are employed in a multitude of applications, including safety-critical ones such as biomedical implants. Due to scarce energy intakes and limited energy buffers, their executions become intermittent, alternating periods of active operation with periods of recharging their energy buffers. Experimental evidence exists that shows how controlling ambient energy allows an attacker to steer a device execution in unintended ways: energy provisioning effectively becomes an attack vector. We design, implement, and evaluate a mitigation system for energy attacks. By taking into account the specific application requirements and the output of an attack detection module, we tune task execution rates and optimize energy management. This ensures continued application execution in the event of an energy attack. When a device is under attack, our solution ensures the execution of 23.3% additional application cycles compared to the baselines we consider and increases task schedulability by at least 21%, while enabling a 34% higher peripheral availability. 

  • 58.
    Sivieri, A.
    et al.
    Politecnico di Milano, Italy.
    Mottola, Luca
    RISE., Swedish ICT, SICS. Politecnico di Milano, Italy.
    Cugola, G.
    Politecnico di Milano, Italy.
    Building Internet of Things software with ELIoT2016Ingår i: Computer Communications, ISSN 0140-3664, E-ISSN 1873-703X, Vol. 89-90, s. 141-153Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    We present ELIoT, a development platform for Internet-connected smart devices. Unlike most solutions for the emerging "Internet of Things" (IoT), ELIoT allows programmers to implement functionality running within the networks of smart devices without necessarily leveraging the external Internet, and yet enables the integration of such functionality with Internet-wide services. ELIoT thus reconciles the demand for efficient localized performance, e.g., reduced latency for implementing control loops, with the need to integrate with the larger Internet. To this end, ELIoT's programming model provides IoT-specific inter-process communication facilities, while its virtual machine-based execution caters for the need of software reconfiguration and the devices' heterogeneity. Moreover, ELIoT addresses network-wide integration concerns by enabling standard-compliant interactions through REST and CoAP interfaces, with the added ability to dynamically reconfigure REST interfaces as application requirements evolve. We demonstrate the features and effectiveness of ELIoT based on a smart-home application, and quantitatively derive performance figures atop two hardware platforms compared to implementations using plain C or Java using the AllJoin framework. Compared to the C implementation, our results indicate that the performance cost for the increased programming productivity brought by ELIoT is still viable; for example, memory consumption in ELIoT is comparable, whereas the processing overhead remains within practical limits. Compared to the Java implementation using AllJoin, ELIoT provides a similar level of abstraction in programming, with much better performance both in memory consumption and processing overhead.

  • 59.
    Stefanizzi, Maria Laura
    et al.
    University of Salento, Italy.
    Mottola, Luca
    RISE - Research Institutes of Sweden, ICT, SICS. Politecnico di Milano, Italy.
    Mainetti, Luca
    University of Salento, Italy.
    Patrono, Luigi
    University of Salento, Italy.
    COIN: Opening the internet of things to people's mobile devices2017Ingår i: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 55, nr 2, s. 20-26, artikel-id A1Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    People's interaction with IoT devices such as proximity beacons, body-worn sensors, and controllable light bulbs is often mediated through personal mobile devices. Current approaches usually make applications operate in separate silos, as the functionality of IoT devices is fixed by vendors and typically accessed only through low-level proprietary APIs. This limits the flexibility in designing applications and requires intense wireless interactions, which may impact energy consumption. COIN is a system architecture that breaks this separation by allowing developers to flexibly run a slice of a mobile app's logic onto IoT devices. Mobile apps can dynamically deploy arbitrary tasks implemented as loosely coupled components. The underlying runtime support takes care of the coordination across tasks and of their real-time scheduling. Our prototype indicates that COIN both enables increased flexibility and improves energy efficiency at the IoT device, compared to traditional architectures.

  • 60.
    Tranquillini, Stefano
    et al.
    University of Trento, Italy.
    Spiess, Patrik
    SAP AG, Germany.
    Daniel, Florian
    University of Trento, Italy.
    Karnouskos, Stamatis
    SAP AG, Germany.
    Casati, Fabio
    University of Trento, Italy.
    Oertel, Nina
    SAP AG, Germany.
    Mottola, Luca
    RISE., Swedish ICT, SICS, Computer Systems Laboratory.
    Oppermann, Felix
    University of Lübeck, Germany.
    Picco, Gian Pietro
    University of Trento, Italy.
    Römer, Kay
    University of Lübeck, Germany.
    Voigt, Thiemo
    RISE., Swedish ICT, SICS, Computer Systems Laboratory.
    Process-Based Design and Integration of Wireless Sensor Network Applications2012Konferensbidrag (Refereegranskat)
    Abstract [en]

    Wireless Sensor and Actuator Networks (WSNs) are distributed sensor and actuator networks that monitor and control real-world phenomena, enabling the integration of the physical with the virtual world. They are used in domains like building automation, control systems, remote healthcare, etc., which are all highly process-driven. Today, tools and insights of Business Process Modeling (BPM) are not used to model WSN logic, as BPM focuses mostly on the coordination of people and IT systems and neglects the integration of embedded IT. WSN development still requires significant special-purpose, low-level, and manual coding of process logic. By exploiting similarities between WSN applications and business processes, this work aims to create a holistic system enabling the modeling and execution of executable processes that integrate, coordinate, and control WSNs. Concretely, we present a WSN-specific extension for Business Process Modeling Notation (BPMN) and a compiler that transforms the extended BPMN models into WSN-specific code to distribute process execution over both a WSN and a standard business process engine. The developed tool-chain allows modeling of an independent control loop for the WSN.

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  • 61.
    Varshney, Ambu
    et al.
    Uppsala university, Sweden.
    Soleiman, Andreas
    Uppsala university, Sweden.
    Mottola, Luca
    RISE - Research Institutes of Sweden, ICT, SICS. Politecnico di Milano, Italy.
    Voigt, Thiemo
    RISE - Research Institutes of Sweden, ICT, SICS. Uppsala university, Sweden.
    Battery-free VisibleLight Sensing2017Ingår i: Proceeding VLCS '17 Proceedings of the 4th ACM Workshop on Visible Light Communication Systems. Snowbird, Utah, USA — October 16 - 16, 2017, 2017, s. 3-8Konferensbidrag (Refereegranskat)
    Abstract [en]

    We present the design of the first Visible Light Sensing (VLS) system that consumes only tens of μWs of power to sense and communicate. Unlike most existing VLS systems, we require no modification to the existing light infrastructure since we use unmodulated light as a sensing medium. We achieve this by designing a novel mechanism that uses solar cells to achieve a sub-μW power consumption for sensing. Further, we devise an ultra-low power transmission mechanism that backscatters sensor readings and avoids the processing and computational overhead of existing sensor systems. Our initial results show the ability to detect and transmit hand gestures or presence of people up to distances of 330m at a peak power of μWs. Further, we demonstrate that our system can operate in diverse light conditions (100 lx to 80 klx) where existing VLS designs fail due to saturation of the transimpedance amplifier (TIA).

  • 62.
    Varshney, Ambuj
    et al.
    Uppsala University, Sweden.
    Mottola, Luca
    RISE., Swedish ICT, SICS, Computer Systems Laboratory. Polytechnic University of Milan, Italy.
    Carlsson, Mats
    RISE., Swedish ICT, SICS, Computer Systems Laboratory.
    Voigt, Thiemo
    RISE., Swedish ICT, SICS, Computer Systems Laboratory. Uppsala University, Sweden.
    Directional Transmissions and Receptions for High-throughput Bulk Forwarding in Wireless Sensor Networks2015Ingår i: Proceedings of the 13th ACM Conference on Embedded Networked Sensor Systems (SenSys '15), 2015, 8, s. 351-364Konferensbidrag (Refereegranskat)
    Abstract [en]

    We present DPT: a wireless sensor network protocol for bulk traffic that uniquely leverages electronically switchable directional (ESD) antennas. Bulk traffic is found in several scenarios and supporting protocols based on standard antenna technology abound. ESD antennas may improve performance in these scenarios; for example, by reducing channel contention as the antenna can steer the radiated energy only towards the intended receivers, and by extending the communication range at no additional energy cost. The corresponding protocol support, however, is largely missing. DPT addresses precisely this issue. First, while the network is quiescent, we collect link metrics across all possible antenna configurations. We use this information to formulate a constraint satisfaction problem (CSP) that allows us to find two multi-hop disjoint paths connecting source and sink, along with the corresponding antenna configurations. Domain-specific heuristics we conceive ameliorate the processing demands in solving the CSP, improving scalability. Second, the routing configuration we obtain is injected back into the network. During the actual bulk transfer, the source funnels data through the two paths by quickly alternating between them. Packet forwarding occurs deterministically at every hop. This allows the source to implicitly "clock" the entire pipeline, sparing the need of proactively synchronizing the transmissions across the two paths. Our results, obtained in a real testbed using 802.15.4-compliant radios and custom ESD antennas we built, indicate that DPT approaches the maximum throughput supported by the link layer, peaking at 21 4 kbit/s in the settings we test.

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  • 63.
    Varshney, Ambuj
    et al.
    Uppsala University, Sweden.
    Mottola, Luca
    RISE., Swedish ICT, SICS, Computer Systems Laboratory. Polytechnic University of Milan, Italy.
    Voigt, Thiemo
    RISE., Swedish ICT, SICS, Computer Systems Laboratory. Uppsala University, Sweden.
    Poster: Coordination of Wireless Sensor Networks using Visible Light2015Ingår i: Proceedings of the 13th ACM Conference on Embedded Networked Sensor Systems (SenSys '15), 2015, 7, s. 421-422Konferensbidrag (Refereegranskat)
    Abstract [en]

    Wireless sensor networks are often deployed indoors where artificial lighting is present. Indoor lighting is increasingly being composed of Light Emitting Diodes (LEDs) that offer the ability to precisely control the intensity and the frequency of the light carrier. This can be used to coordinate wireless sensor networks (WSN). The periodic variations in the light intensity can synchronise the clocks on the sensor nodes, while the ability to modulate the light carrier enables the transmission of control information like channel assignment or transmission schedules. We present Guidelight, a simple mechanism that uses controlled fluctuations in the light intensity to coordinate sensor nodes. Guidelight can wake-up or time synchronise sensor nodes or even send small bits of control information to them. All of these have separate dedicated solutions in WSN. Guidelight aims to provide a single solution to all these problems. Our initial experiments demonstrate the ability of Guidelight to trigger sensor nodes. We demonstrate Guidelight is able to trigger sensor nodes selectively at a mean error of 21 µs.

  • 64.
    Varshney, Ambuj
    et al.
    Uppsala University, Sweden.
    Voigt, Thiemo
    RISE., Swedish ICT, SICS, Computer Systems Laboratory.
    Mottola, Luca
    RISE., Swedish ICT, SICS, Computer Systems Laboratory.
    Poster Abstract: Directional Transmissions and Receptions for Burst Forwarding using Disjoint Paths2014Konferensbidrag (Refereegranskat)
    Abstract [en]

    Bulk data transmission is an important traffic pattern of many sensor network applications. These applications deliver large amounts of sensed data to a sink node for further processing. Most of the existing bulk data transmission protocols use a single flow of communication. This is inefficient as the radio at the source node is transmitting and the sink node is receiving packets for only half of the duration of the burst. We show in this paper that reduced contention because of directional communication enables us to construct node disjoint paths from the source to the sink node using only one wireless channel. This allows us to forward subsequent packets in the burst on the disjoint paths which maximises the radio transmit and receive time at the source and the sink node respectively. We demonstrate that this doubles the sink throughput as compared to a single flow of communication.

  • 65.
    Varshney, Ambuj
    et al.
    Uppsala University, Sweden.
    Voigt, Thiemo
    RISE., Swedish ICT, SICS, Computer Systems Laboratory. Uppsala University, Sweden.
    Mottola, Luca
    RISE., Swedish ICT, SICS, Computer Systems Laboratory. Politecnico di Milano, Italy.
    Poster Abstract: Directional Transmissions and Receptions for High Throughput Burst Forwarding2013Konferensbidrag (Refereegranskat)
    Abstract [en]

    Many sensor network applications generate large amounts of sensed data. These often need to be delivered reliably to the sink node for further processing. In such applications, high communication throughput allows for more data to be sensed. Intra-path interference is a problem in reliable forwarding of data and afects the end-to-end throughput. We show that using antennas that allow directional transmissions and receptions significantly reduces intra-path interference and enables high throughput forwarding of packet bursts over multiple hops using only one wireless channel.

  • 66.
    Varshney, Ambuj
    et al.
    Uppsala University, Sweden.
    Voigt, Thiemo
    RISE., Swedish ICT, SICS, Computer Systems Laboratory. Uppsala University, Sweden.
    Mottola, Luca
    RISE., Swedish ICT, SICS, Computer Systems Laboratory. Politecnico di Milano, Italy.
    Using Directional Transmissions and Receptions to Reduce Contention in Wireless Sensor Networks2014Konferensbidrag (Refereegranskat)
    Abstract [en]

    Electronically Switched Directional (ESD) antennas allow software-based control of the direction of maximum antenna gain. ESD antennas are feasible for wireless sensor network. Existing studies with these antennas focus only on controllable directional transmissions. These studies demonstrate reduced contention and increased range of communication with no energy penalty. Unlike existing literature, in this chapter we experimentally explore controllable antenna directionality at both sender and receiver. One key outcome of our experiments is that directional transmissions and receptions together considerably reduce channel contention. As a result, we can significantly reduce intra-path interference.

  • 67.
    Voigt, Thiemo
    et al.
    RISE., Swedish ICT, SICS, Computer Systems Laboratory. Uppsala University, Sweden.
    Mottola, Luca
    RISE., Swedish ICT, SICS, Computer Systems Laboratory. Politecnico di Milano, Italy.
    Hewage, Kasun
    Uppsala University, Sweden.
    Understanding Link Dynamics in Wireless Sensor Networks with Dynamically Steerable Directional Antennas2013Konferensbidrag (Refereegranskat)
    Abstract [en]

    By radiating the power in the direction of choice, electronically-switched directional (ESD) antennas can reduce network contention and avoid packet loss. There exists some ESD antennas for wireless sensor networks, but so far researchers have mainly evaluated their directionality. There are no studies regarding the link dynamics of ESD antennas, in particular not for indoor deployments and other scenarios where nodes are not necessarily in line of sight. Our long-term experiments confirm that previous findings that have demonstrated the dependence of angle-of-arrival on channel frequency also hold for directional transmissions with ESD antennas. This is important for the design of protocols for wireless sensor networks with ESD antennas: the best antenna direction, i.e., the direction that leads to the highest packet reception rate and signal strength at the receiver, is not stable but varies over time and with the selected IEEE 802.15.4 channel. As this requires protocols to incorporate some form of adaptation, we present an intentionally simple and yet efficient mechanism for selecting the best antenna direction at run-time with an energy overhead below 2% compared to standard omni-directional transmissions.

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  • 68. Wu, Huayong
    et al.
    Zonta, D.
    Pozzi, M.
    Zanon, P.
    Ceriotti, M.
    Mottola, Luca
    RISE., Swedish ICT, SICS, Computer Systems Laboratory.
    Picco, G. P.
    Guna, S.
    Murphy, A. L.
    Corrà, M.
    Wireless Sensors for Permanent Monitoring of Heritage Buildings2010Konferensbidrag (Refereegranskat)
  • 69.
    Zimmerling, Marco
    et al.
    ETH Zurich, Switzerland.
    Ferrari, Federico
    ETH Zurich, Switzerland.
    Mottola, Luca
    RISE., Swedish ICT, SICS.
    Thiele, Lothar
    ETH Zurich, Switzerland.
    On modeling low-power wireless protocols based on synchronous packet transmissions2013Ingår i: Proceedings - IEEE Computer Society's Annual International Symposium on Modeling, Analysis, and Simulation of Computer and Telecommunications Systems, MASCOTS, 2013, s. 546-555, artikel-id 6730811Konferensbidrag (Refereegranskat)
    Abstract [en]

    Mathematical models play a pivotal role in understanding and designing advanced low-power wireless systems. However, the distributed and uncoordinated operation of traditional multi-hop low-power wireless protocols greatly complicates their accurate modeling. This is mainly because these protocols build and maintain substantial network state to cope with the dynamics of low-power wireless links. Recent protocols depart from this design by leveraging synchronous transmissions (ST), whereby multiple nodes simultaneously transmit towards the same receiver, as opposed to pair wise link-based transmissions (LT). ST improve the one-hop packet reliability to an extent that efficient multi-hop protocols with little network state are feasible. This paper studies whether ST also enable simple yet accurate modeling of these protocols. Our contribution to this end is two-fold. First, we show, through experiments on a 139-node test bed, that characterizing packet receptions and losses as a sequence of independent and identically distributed (i.i.d.) Bernoulli trials-a common assumption in protocol modeling but often illegitimate for LT-is largely valid for ST. We then show how this finding simplifies the modeling of a recent ST-based protocol, by deriving (i) sufficient conditions for probabilistic guarantees on the end-to-end packet reliability, and (ii) a Markovian model to estimate the long-term energy consumption. Validation using test bed experiments confirms that our simple models are also highly accurate, for example, the model error in energy against real measurements is 0.25%, a figure never reported before in the related literature.

  • 70. Zimmerling, Marco
    et al.
    Ferrari, Federico
    Mottola, Luca
    RISE., Swedish ICT, SICS, Computer Systems Laboratory.
    Voigt, Thiemo
    RISE., Swedish ICT, SICS, Computer Systems Laboratory.
    Thiele, Lothar
    pTunes: Runtime Parameter Adaptation for Low-power MAC Protocols2012Konferensbidrag (Refereegranskat)
  • 71.
    Zimmerling, Marco
    et al.
    Center for Advancing Electronics Dresden, Germany .
    Mottola, Luca
    RISE Research Institutes of Sweden, Digitala system, Datavetenskap. Politecnico di Milano, Italy.
    Santini, Silvia
    Universitá della Svizzera Italiana, Switzerland.
    Synchronous Transmissions in Low-Power Wireless: A Survey of Communication Protocols and Network Services2021Ingår i: ACM Computing Surveys, ISSN 0360-0300, E-ISSN 1557-7341, Vol. 53, nr 6, artikel-id 121Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Low-power wireless communication is a central building block of cyber-physical systems and the Internet of Things. Conventional low-power wireless protocols make avoiding packet collisions a cornerstone design choice. The concept of synchronous transmissions challenges this view. As collisions are not necessarily destructive, under specific circumstances, commodity low-power wireless radios are often able to receive useful information even in the presence of superimposed signals from different transmitters. We survey the growing number of protocols that exploit synchronous transmissions for higher robustness and efficiency as well as unprecedented functionality and versatility compared to conventional designs. The illustration of protocols based on synchronous transmissions is cast in a conceptional framework we establish, with the goal of highlighting differences and similarities among the proposed solutions. We conclude this article with a discussion on open questions and challenges in this research field

  • 72. Zonta, D.
    et al.
    Pozzi, M.
    Wu, Huayong
    Zanon, P.
    Ceriotti, M.
    Mottola, Luca
    RISE., Swedish ICT, SICS, Computer Systems Laboratory.
    Picco, G. P.
    Murphy, A. L.
    Guna, S.
    Real-Time Health Monitoring of Historic Buildings with Wireless Sensor Networks2009Konferensbidrag (Refereegranskat)
  • 73.
    Österlind, Fredrik
    et al.
    RISE., Swedish ICT, SICS.
    Mottola, Luca
    RISE., Swedish ICT, SICS, Computer Systems Laboratory.
    Voigt, Thiemo
    RISE., Swedish ICT, SICS, Computer Systems Laboratory.
    Tsiftes, Nicolas
    RISE., Swedish ICT, SICS, Computer Systems Laboratory.
    Dunkels, Adam
    RISE., Swedish ICT, SICS.
    Strawman: Resolving Collisions in Bursty Low-Power Wireless Networks2012Konferensbidrag (Refereegranskat)
    Ladda ner fulltext (pdf)
    fulltext
  • 74. Öström, Erik
    et al.
    Mottola, Luca
    RISE., Swedish ICT, SICS, Computer Systems Laboratory.
    Nilsson, Martin
    RISE., Swedish ICT, SICS, Computer Systems Laboratory.
    Voigt, Thiemo
    RISE., Swedish ICT, SICS, Computer Systems Laboratory.
    Demo Abstract: Smart Antennas Made Practical: The SPIDA Way2010Konferensbidrag (Refereegranskat)
    Ladda ner fulltext (pdf)
    fulltext
  • 75. Öström, Erik
    et al.
    Mottola, Luca
    RISE., Swedish ICT, SICS, Computer Systems Laboratory.
    Voigt, Thiemo
    RISE., Swedish ICT, SICS, Computer Systems Laboratory.
    Evaluation of an Electronically Switched Directional Antenna for Real-world Low-power Wireless Networks2010Konferensbidrag (Refereegranskat)
    Abstract [en]

    We present the real-world evaluation of SPIDA, an electronically switched directional antenna. Compared to most existing work in the field, SPIDA is practical as well as inexpensive. We interface SPIDA with an off-the-shelf sensor node which provides us with a fully working real-world prototype. We assess the performance of our prototype by comparing the behavior of SPIDA against traditional omni-directional antennas. Our results demonstrate that the SPIDA prototype concentrates the radiated power only in given directions, thus enabling increased communication range at no additional energy cost. In addition, compared to the other antennas we consider, we observe more stable link performance and better correspondence between the link performance and common link quality estimators.

    Ladda ner fulltext (pdf)
    fulltext
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