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A Node-Link Perspective on the Impact of Local Conditions in Sensor Networks
Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Division of Computer Systems. Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Architecture and Computer Communication. (Communication Research)
2016 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Sensor networks are made up of small battery-powered sensing devices with wireless communication capabilities, enabling the network to monitor the environment in which it is deployed. Through their flexible and cable-free design these networks open up for new deployment scenarios that were previously not plausible such as during a natural disaster. Motivated by scenarios where centralized oversight is not possible the focus of this thesis is to equip nodes with further adaptability to changes in the links it has with other nodes. This is achieved through contributions in three areas focusing on observations from a node-link perspective.

First, the impact the local environment has on the nodes is explored by deploying a sensor network outdoors next to a meteorological station to correlate the variations in link quality to the changes in the environment. The work identifies temperature as the main factor, where through further investigations in a controlled setting, a linear relationship between the decrease in signal quality and the increase in temperature is described.

Secondly, the thesis address how nodes in a sensor network can be motivated to exchange data by modeling it as a game. The game theoretic design is motivated by the absence of any centralized control and focus on the nodes as individual users in the network. The presented design motivates the selfish nodes to participate in the exchange of sensor data, showing that it is the best strategy.

Lastly, by exploring and understanding how connections in a mobile sensor network occur, nodes are given more flexibility to determine how to send and sample sensor data. This adaptability to contact occurrences is shown to provide better ways of sending data by selecting higher quality links as well as making sampling more energy preserving by reducing the rate in the vicinity of other nodes.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2016. , 57 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1398
Keyword [en]
Sensor networks, opportunistic communication, meterlological impact, packet corruption, multi-contacts
National Category
Communication Systems
Research subject
Computer Science with specialization in Computer Communication
Identifiers
URN: urn:nbn:se:uu:diva-300168ISBN: 978-91-554-9643-2OAI: oai:DiVA.org:uu-300168DiVA: diva2:951209
Public defence
2016-09-23, P2446, Lägerhyddsvägen 2, Uppsala, 13:15 (English)
Opponent
Supervisors
Projects
CNDSWISENET
Available from: 2016-08-31 Created: 2016-08-04 Last updated: 2016-09-08
List of papers
1. A long-term study of correlations between meteorological conditions and 802.15.4 link performance
Open this publication in new window or tab >>A long-term study of correlations between meteorological conditions and 802.15.4 link performance
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2013 (English)In: Proc. 10th International Conference on Sensing, Communications, and Networking, IEEE Communications Society, 2013, 221-229 p.Conference paper (Refereed)
Place, publisher, year, edition, pages
IEEE Communications Society, 2013
National Category
Computer Science Communication Systems
Identifiers
urn:nbn:se:uu:diva-200165 (URN)10.1109/SAHCN.2013.6644981 (DOI)978-1-4799-0230-9 (ISBN)
Conference
SECON 2013
Projects
CNDSWISENET
Available from: 2013-05-21 Created: 2013-05-21 Last updated: 2016-08-26Bibliographically approved
2. Hot Packets: A systematic evaluation of the effect of temperature on low power wireless transceivers
Open this publication in new window or tab >>Hot Packets: A systematic evaluation of the effect of temperature on low power wireless transceivers
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2013 (English)In: Proc. 5th Extreme Conference on Communication, New York: ACM Press, 2013, 7-12 p.Conference paper (Refereed)
Abstract [en]

Temperature is known to have a significant effect on the performance of radio transceivers: the higher the temperature, the lower the quality of links. Analysing this effect is particularly important in sensor networks because several applications are exposed to harsh environmental conditions. Daily or hourly changes in temperature can dramatically reduce the throughput, increase the delay, or even lead to network partitions. A few studies have quantified the impact of temperature on low-power wireless links, but only for a limited temperature range and on a single radio transceiver. Building on top of these preliminary observations, we design a low-cost experimental infrastructure to vary the onboard temperature of sensor nodes in a repeatable fashion, and we study systematically the impact of temperature on various sensornet platforms. We show that temperature affects transmitting and receiving nodes differently, and that all platforms follow a similar trend that can be captured in a simple first-order model. This work represents an initial stepping stone aimed at predicting the performance of a network considering the particular temperature profile of a given environment.

Place, publisher, year, edition, pages
New York: ACM Press, 2013
National Category
Computer Science Communication Systems
Identifiers
urn:nbn:se:uu:diva-201338 (URN)978-1-4503-2171-6 (ISBN)
Conference
ExtremeCom 2013
Projects
CNDSWISENET
Available from: 2013-06-10 Created: 2013-06-10 Last updated: 2016-08-26Bibliographically approved
3. All is not lost: Understanding and exploiting packet corruption in outdoor sensor networks
Open this publication in new window or tab >>All is not lost: Understanding and exploiting packet corruption in outdoor sensor networks
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2014 (English)In: Wireless Sensor Networks: EWSN 2014, Springer Berlin/Heidelberg, 2014, 116-132 p.Conference paper (Refereed)
Place, publisher, year, edition, pages
Springer Berlin/Heidelberg, 2014
Series
, Lecture Notes in Computer Science, 8354
National Category
Computer Science Communication Systems
Identifiers
urn:nbn:se:uu:diva-211736 (URN)10.1007/978-3-319-04651-8_8 (DOI)000340395900008 ()978-3-319-04650-1 (ISBN)
Conference
11th European Conference on Wireless Sensor Networks, Feb 17-19, 2014, Oxford, England
Projects
WISENETProFuN
Available from: 2013-11-29 Created: 2013-11-29 Last updated: 2016-08-26Bibliographically approved
4. A Game Theoretic Approach to Sensor Data Communications in an Opportunistic Network
Open this publication in new window or tab >>A Game Theoretic Approach to Sensor Data Communications in an Opportunistic Network
2015 (English)In: Proc. International Conference on Communications: ICC 2015, Piscataway, NJ: IEEE , 2015, 6306-6311 p.Conference paper (Refereed)
Abstract [en]

Opportunistic communication coupled with a sensing task enables the collection and spreading of sensory information in areas without global connectivity, providing useful information in challenging environments. In this paper, we consider an opportunistic sensor network where the mobility of users enables both the measurement and spreading of sensor data. We motivate user participation through a game theoretic approach, which is designed to ensure a fair and efficient exchange of sensor messages.The message exchange is modeled as a two-player game where sensor measurements are exchanged between nodes in a contrite tit-for-tat manner. The proposed game captures the nodes desire to limit energy consumption while at the same time obtaining messages containing useful information.We show that the best response in the game is a Pareto optimal subgame perfect equilibrium. The game is evaluated through simulation in a realistic scenario and compared with three other approaches, generating the best overall efficiency by striking a balance between size and content of messages.

Place, publisher, year, edition, pages
Piscataway, NJ: IEEE, 2015
Series
, IEEE International Conference on Communications, ISSN 1550-3607
National Category
Computer and Information Science
Identifiers
urn:nbn:se:uu:diva-260256 (URN)10.1109/ICC.2015.7249329 (DOI)000371708106087 ()9781467364324 (ISBN)
Conference
ICC 2015, June 9–12, London, UK
Projects
CNDS
Available from: 2015-08-18 Created: 2015-08-18 Last updated: 2016-08-26Bibliographically approved
5. Considering Multi-Contact Encounters in Opportunistic Networks
Open this publication in new window or tab >>Considering Multi-Contact Encounters in Opportunistic Networks
2015 (English)In: Proceedings of the 10th ACM MobiCom Workshop on Challenged Networks, ACM Digital Library, 2015Conference paper (Refereed)
Abstract [en]

Opportunistic networks, often characterized by their intermittent connectivity and sparsity of nodes, has sparked routing in these networks to focus on isolated contact opportunities. Routing has predominantly been viewed as an exchange of messages between a pair of nodes. In this paper, we take a new look at contact opportunities, specifically focusing on the occurrence of having multiple simultaneous node contacts. Multi-contact encounters warrants a more holistic view of routing decisions, where more factors than just the features of a message-node tuple can be considered. We discuss these aspects and propose a protocol addition to leverage multi-contact opportunities with the notion of heterogeneous link quality, in order to limit energy consumption. The approach, implemented for the Epidemic, Spray-and-Wait and PRoPHETv2 protocols, re-evaluates routing decisions, weighting the routing metrics value against the estimated cost of the relay. Results indicate a two to three fold decrease in the number of messages lost, as well as a reduction in message relays, while maintaining a high delivery ratio for all three protocols.

Place, publisher, year, edition, pages
ACM Digital Library, 2015
National Category
Communication Systems
Research subject
Computer Science with specialization in Computer Communication
Identifiers
urn:nbn:se:uu:diva-265854 (URN)10.1145/2799371.2799378 (DOI)978-1-4503-3543-0 (ISBN)
Conference
CHANTS '15, The 21st Annual International Conference on Mobile Computing and Networking, sept 7-11 2015, Paris, France
Projects
CNDS
Available from: 2015-11-03 Created: 2015-11-03 Last updated: 2016-08-26Bibliographically approved
6. Towards even coverage monitoring with opportunistic sensor networks
Open this publication in new window or tab >>Towards even coverage monitoring with opportunistic sensor networks
2016 (English)In: Proc. 11th ACM MobiCom Workshop on Challenged Networks, New York: ACM Press, 2016Conference paper (Refereed)
Place, publisher, year, edition, pages
New York: ACM Press, 2016
National Category
Communication Systems
Research subject
Computer Science with specialization in Computer Communication
Identifiers
urn:nbn:se:uu:diva-300167 (URN)10.1145/2979683.2979691 (DOI)
Conference
CHANTS 2016, October 3–7, New York
Projects
CNDS
Available from: 2016-08-04 Created: 2016-08-04 Last updated: 2016-08-26

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