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  • 1.
    António, Gonga
    et al.
    KTH, School of Electrical Engineering (EES), Automatic Control.
    Landsiedel, O.
    Soldati, Pablo
    KTH, School of Electrical Engineering (EES), Automatic Control.
    Johansson, Mikael
    KTH, School of Electrical Engineering (EES), Automatic Control.
    Multi-channel communication vs. adaptive routing for reliable communication in WSNs2012In: IPSN'12 - Proceedings of the 11th International Conference on Information Processing in Sensor Networks, Association for Computing Machinery (ACM), 2012, p. 125-126Conference paper (Refereed)
    Abstract [en]

    Interference and link dynamics constitute great concerns for stability and performance of protocols in WSNs. In this paper we evaluate the impact of channel hopping and adaptive routing on delay and reliability focusing on delay critical applications.

  • 2.
    Gonga, Antonio
    et al.
    KTH, School of Electrical Engineering (EES), Automatic Control.
    Charalambous, Themistoklis
    KTH, School of Electrical Engineering (EES), Automatic Control.
    Johansson, Mikael
    KTH, School of Electrical Engineering (EES), Automatic Control.
    Fast Information Exchange in Proximity-Based Multichannel Wireless Networks2015In: Proceedings - 2015 8th IFIP Wireless and Mobile Networking Conference, WMNC 2015, IEEE conference proceedings, 2015, p. 24-31Conference paper (Refereed)
    Abstract [en]

    This paper considers the problem of distributed neighbor discovery in multi-channel wireless networks. We propose a protocol in which nodes randomly select a channel and decide whether to transmit or listen for neighbor discovery beacons. When nodes transmit, they use epidemic information dissemination to spread knowledge about all the nodes they have discovered so far. Theoretical guarantees on discovery times are complemented by extensive simulations and practical implementations. The evaluations show that multi-channel communication effectively reduces the number of collisions between nodes in the network (especially in dense networks) and that epidemic information dissemination yields both significant speed-ups and increased resilience to packet losses. Finally, we also show that our protocol compares favorably to previously proposed solutions in the literature.

  • 3.
    Gonga, António
    KTH, School of Electrical Engineering (EES), Automatic Control.
    Mobility and Multi-channel Communications in Low-power Wireless Networks2015Doctoral thesis, monograph (Other academic)
    Abstract [en]

    The prospect of replacing existing fixed networks with cheap, flexible and evenmobile low-power wireless network has been a strong research driver in recent years.However, many challenges still exist: reliability is hampered by unstable and burstycommunication links; the wireless medium is getting congested by an increasingnumber of wireless devices; and life-times are limited due to difficulties in developingefficient duty-cycling mechanisms. These challenges inhibit the industry to fullyembrace and exploit the capabilities and business opportunities that low-powerwireless devices offer. In this thesis, we propose, design, implement, and evaluateprotocols and systems to increase flexibility and improve efficiency of low-powerwireless communications.

    First, we present MobiSense, a system architecture for energy-efficient communicationsin micro-mobility sensing scenarios. MobiSense is a hybrid architecturecombining a fixed infrastructure network and mobile sensor nodes. Simulations andexperimental results show that the system provides high throughput and reliabilitywith low-latency handoffs.

    Secondly, we investigate if and how multi-channel communication can mitigate theimpact of link dynamics on low-power wireless protocols. Our study is motivated bya curiosity to reconcile two opposing views: that link dynamics is best compensatedby either (i) adaptive routing, or (ii) multi-channel communication. We perform acomprehensive measurement campaign and evaluate performance both in the singlelink and over a multi-hop network. We study packet reception ratios, maximumburst losses, temporal correlation of losses and loss correlations across channels.The evaluation shows that multi-channel communication significantly reduces linkburstiness and packet losses. In multi-hop networks, multi-channel communicationsand adaptive routing achieves similar end-to-end reliability in dense topologies,while multi-channel communication outperforms adaptive routing in sparse networkswhere re-routing options are limited.

    Third, we address the problem of distributed information exchange in proximitybasednetworks. First, we consider randomized information exchange and assess thepotential of multi-channel epidemic discovery. We propose an epidemic neightbordiscoverymechanism that reduces discovery times considerably compared to singlechannelprotocols in large and dense networks. Then, the idea is extended todeterministic information exchange. We propose, design and evaluate an epidemicinformation dissemination mechanism with strong performance both in theory andpractice.

    Finally, we apply some of the concepts from epidemic discovery to the designof an asynchronous, sender-initiated multi-channel medium access protocol. Theprotocol combines a novel mechanism for rapid schedule learning that avoids perpacketchannel negotiations with the use of burst data transfer to provide efficientsupport of ’multiple contending unicast and parallel data flows.

  • 4.
    Gonga, António
    et al.
    KTH, School of Electrical Engineering (EES), Automatic Control.
    Charalambous, Themistoklis
    KTH, School of Electrical Engineering (EES), Automatic Control.
    Johansson, Mikael
    KTH, School of Electrical Engineering (EES), Automatic Control.
    Neighbor discovery in multichannel wireless clique networks: An epidemic approach2013In: Proceedings - IEEE 10th International Conference on Mobile Ad-Hoc and Sensor Systems, MASS 2013, IEEE , 2013, p. 131-135Conference paper (Refereed)
    Abstract [en]

    We investigate the problem of neighbor discovery in multichannel wireless ad hoc and sensor networks with epidemic information dissemination. Previous works have considered neighbor discovery in a single channel where at most one node can be discovered per time instant. To reduce the effect of collisions observed in single channel solutions, we formulate models for multichannel neighbor discovery and allow for epidemic dissemination of information. As a result, nodes can discover all their neighbors faster, either directly or indirectly by hopping between orthogonal channels and exploring the neighbors in each of them. We show analytically, by simulations, and by experimental evaluations that the expected neighbor discovery time is reduced considerably compared to single channel neighbor discovery solutions.

  • 5.
    Gonga, António
    et al.
    KTH, School of Electrical Engineering (EES), Automatic Control.
    Johansson, Mikael
    KTH, School of Electrical Engineering (EES), Automatic Control.
    Dunkels, A.
    MobiSense: Power-efficient micro-mobility in IPv6-based sensor networks2010In: Proceedings of the 9th ACM/IEEE International Conference on Information Processing in Sensor Networks, IPSN '10, 2010, p. 414-415Conference paper (Refereed)
    Abstract [en]

    Emerging applications in industrial automation and medical care demand support for uninterrupted connectivity and reliable data transfer from mobile sensors. We present MobiSense, an energy-efficient system for reliable data transfer supporting IPv6 micro-mobility and fast handovers. We demonstrate that a two-way end-to-end IPv6 UPD session between two mobile nodes can achieve an end-to-end reliability of up to 96% while guarateeing a hand-over latency below 2 seconds.

  • 6.
    Gonga, António
    et al.
    KTH, School of Electrical Engineering (EES), Automatic Control.
    Landsiedel, O.
    Soldati, P.
    Johansson, Mikael
    KTH, School of Electrical Engineering (EES), Automatic Control.
    Revisiting multi-channel communication to mitigate interference and link dynamics in wireless sensor networks2012In: Proceedings - IEEE International Conference on Distributed Computing in Sensor Systems, DCOSS 2012, IEEE Computer Society, 2012, p. 186-193Conference paper (Refereed)
    Abstract [en]

    Multichannel communication has been proposed as alternative to adaptive (single-channel) routing protocols for mitigating the impact of interference and link dynamics in wireless sensor networks. While several studies have advocated features of both techniques (not without running up against contradicting arguments) a comprehensive study that aligns these results is still lacking. This paper aims at filling this gap. We present an experimental test bed setup used to perform extensive measurements for both single-channel and multichannel communication. We first analyze single-channel and multichannel communication over a single-hop in terms of packet reception ratio, maximum burst loss, temporal correlation of losses, and loss correlations across channels. Results show that multichannel communication with channel hopping significantly reduces link burstiness and packet loss correlation. For multi-hop networks, multi-channel communication and adaptive routing show similar end-to-end reliability in dense topologies, while multichannel communication can outperform adaptive routing in sparse networks with bursty links.

  • 7.
    Gonga, António
    et al.
    KTH, School of Electrical Engineering (EES), Automatic Control.
    Landsiedel, Olaf
    KTH, School of Electrical Engineering (EES), Automatic Control.
    Johansson, Mikael
    KTH, School of Electrical Engineering (EES), Automatic Control.
    MobiSense: power-efficient micro-mobility in wireless sensor networks2011In: 2011 International Conference on Distributed Computing in Sensor Systems and Workshops, DCOSS'11, 2011Conference paper (Refereed)
    Abstract [en]

    Emerging applications in industrial automation as well as tracking and monitoring applications of humans, objects or animals share common requirements: micro-mobility, high-throughput, and two-way end-to-end communications. In this paper we present MobiSense, a MAC layer and routing architecture for micro-mobility environments providing reliable and energy-efficient communication and low-latency handoffs. MobiSense's energy-efficiency and reliability comes from a set of carefully chosen design elements: rapid network information gathering, rapid network (re)admission and convergence, distributed network formation, and dynamic scheduling. Testbed evaluations show that a mobile sensor achieves: (i) reliability above 95% even in scenarios with high data rates of 6pps/node; (ii) low latency-handoffs typically below 1 second; (iii) a high aggregate system throughput of more than 95kbps; (iv) two-way communication without the need for flooding; and (v) communication at very low duty-cycles below 4% at 6pps/node.

  • 8.
    Lindh, Thomas
    et al.
    KTH, School of Technology and Health (STH), Data- och elektroteknik (Closed 20130701).
    Orhan, Ibrahim
    KTH, School of Technology and Health (STH), Data- och elektroteknik (Closed 20130701).
    Gonga, Antonio
    KTH, School of Technology and Health (STH), Data- och elektroteknik (Closed 20130701).
    A performance monitoring method for wireless sensor networks2008In: PETRA '08 Proceedings of the 1st international conference on PErvasive Technologies Related to Assistive Environments, New York: ACM , 2008Conference paper (Refereed)
    Abstract [en]

    This paper presents a monitoring method and its implementation as a light-weight end-to-end performance meter for quality-demanding applications in wireless sensor networks. The use of performance feedback information for control and management is also considered. The method is evaluated in a wireless sensor network testbed for healthcare applications.

  • 9.
    Orhan, Ibrahim
    et al.
    KTH, School of Technology and Health (STH), Data- och elektroteknik (Closed 20130701).
    Gonga, Antonio
    KTH, School of Technology and Health (STH), Data- och elektroteknik (Closed 20130701).
    Lindh, Thomas
    KTH, School of Technology and Health (STH), Data- och elektroteknik (Closed 20130701).
    An End-to-End Performance Meter for Applications in Wireless Body Sensor Networks2008In: 2008 5th International Summer School and Symposium on Medical Devices and Biosensors, Institute of Electrical and Electronics Engineers (IEEE), 2008, p. 295-298Conference paper (Refereed)
    Abstract [en]

    This paper presents a monitoring method and its implementation as a light-weight end-to-end performance meter for quality-demanding applications in wireless body sensor networks. The method is evaluated in a wireless sensor network testbed for healthcare applications.

1 - 9 of 9
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