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Distributed Context Support for Ubiquitous Mobile Awareness Services
Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media. (SensibleReality)
Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media. (SensibleReality)
Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media. (SensorBasedServices, SensibleReality)
Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media. (SensibleReality)ORCID iD: 0000-0002-1342-0966
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2009 (English)In: 2009 Fourth International ICST Conference on Communications and Networking in China. ChinaCom'09., IEEE conference proceedings, 2009, p. 869-873Conference paper, Published paper (Refereed)
Abstract [en]

Context-aware applications and services require ubiquitous access to context information about the users or sensors such as preferences, spatial & environmental data, available connectivity, and device capabilities. Systems for the brokering or the provisioning of context data via wireless networks do so with centralized servers or by employing protocols that do not scale well with real-time distribution capabilities. In other cases, such as the extending of presence systems, the data models are limited in expressive capabilities and consequently incur unnecessary signaling overhead. This paper presents a distributed protocol, the Distributed Context eXchange Protocol (DCXP), and an architecture for the real-time distribution of context information to ubiquitous mobile services: We present the architecture and its principle operation in a sample ubiquitous mobile awareness service. Preliminary results indicate that our approach scales well for the ubiquitous provision of context data in real-time to clients on the Internet via 3G wireless systems. Performed measurements show that DCXP can reduce the time to process context data with a factor of 20 compared to similar approaches.

 

Place, publisher, year, edition, pages
IEEE conference proceedings, 2009. p. 869-873
Keywords [en]
3G wireless; Centralized server; Context aware applications; Context data; Context information; Data models; Distributed protocols; Environmental data; Exchange protocols; Mobile awareness; Mobile service; Time distribution; Ubiquitous access, Internet protocols; Network architecture; Network protocols; Real time systems; Wireless networks; Wireless telecommunication systems
National Category
Computer Sciences
Identifiers
URN: urn:nbn:se:miun:diva-9669DOI: 10.1109/CHINACOM.2009.5339728Scopus ID: 2-s2.0-71749111713ISBN: 978-1-4244-4337-6 (print)OAI: oai:DiVA.org:miun-9669DiVA, id: diva2:235625
Conference
2009 4th International Conference on Communications and Networking in China, CHINACOM 2009; Xian; 26 August 2009 through 28 August 2009; Category number CFP0970A; Code 78908
Available from: 2009-09-17 Created: 2009-09-17 Last updated: 2018-01-13Bibliographically approved
In thesis
1. Enabling Adaptive Context Views for Mobile Applications: Negotiating Global and Dynamic Sensor Information
Open this publication in new window or tab >>Enabling Adaptive Context Views for Mobile Applications: Negotiating Global and Dynamic Sensor Information
2011 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Mobile devices with Internet access and large amounts of sensors, pushes the development of intelligent services towards new forms of pervasive applications. These applications are made context-aware by utilizing information from sensors and hence the context of a situation, in order to provide a better service. Based on this, the focus of this thesis is on the challenge of creating context awareness in mobile applications. That both utilizes dynamic context information from globally available sensors and provides adaptive views of relevant context information to applications.

The first challenge is to identify the properties of an architecture that provides scalable access to information from global sensors within bounded time, because existing systems do not support these properties in a satisfactory manner. The majority of related systems employ a centralized approach with limited support for global sensor information due to poor scalability. Therefore, this thesis proposes a distributed architecture capable of exchanging context between users and entities on a peer-to-peer overlay. Pervasive applications can thus utilize global sensor information in a scalable and manageable way within predictable time bounds.

The second challenge to support continually changing and evolving context information, while providing it as both adaptive and manageable views to applications. To address this particular problem, this thesis proposes the usage of a locally stored evolving context object called a context schema. In detail, this schema contains all context information that is considered as being relevant for a specific user or entity. Furthermore, this thesis proposes an application interface that can provide snapshots of the evolving context schemas as adaptive views. These views can then be used in context-aware mobile applications, without inducing unnecessary delays.

By successfully addressing the challenges, this thesis enables the creation of pervasive and adaptive applications that utilize evolving context in mobile environments. These capabilities are made possible by enabling access to global sensor information based on a distributed context exchange overlay, in combination with evolving context schemas offered as views through an application interface. In support of these claims, this thesis has developed numerous proof-of-concept applications and prototypes to verify the approach. Hence, this thesis concludes that the proposed approach with evolving context information has the ability to scale in a satisfactory manner and also has the ability to dynamically offer relevant views to applications in a manageable way.

Place, publisher, year, edition, pages
Sundsvall: Mittuniversitetet, 2011. p. 68
Series
Mid Sweden University licentiate thesis, ISSN 1652-8948 ; 58
Keywords
Context, Sensors, Mobile applications
National Category
Computer Sciences
Identifiers
urn:nbn:se:miun:diva-13919 (URN)STC (Local ID)978-91-86694-36-4 (ISBN)STC (Archive number)STC (OAI)
Opponent
Supervisors
Projects
MediaSense
Available from: 2011-06-03 Created: 2011-06-03 Last updated: 2018-01-12Bibliographically approved
2. Automatic sensor clustering: connectivity for the internet of things
Open this publication in new window or tab >>Automatic sensor clustering: connectivity for the internet of things
2011 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Current predictions from industry envision that within a decade, the Internet will bepopulated by tens of billion of devices. Already today, smart Internet devices havesensors that provide an enormous potential for creating new applications. The chal-lenge at hand is how this information can be shared on the future Internet in order tounlock the full capability of applications to interact with the real world. Therefore,there is an urgent need for scalable and agile support for connecting people, placesand artifacts in applications via a vast number of devices and sensors on the futureInternet. Clearly, this poses a challenge of sharing and thus storage of so-called con-text information. Beyond scalable context storage lays another challenge to identifyand locate devices that are important to the user. In a support for billion of contin-uously changing sensors and actuators, a search engine would not work. Thereforean intelligent way to group devices is required. This thesis deals with mainly three issues: Firstly, propose a method for devicesto be reachable and thus addressable independent of their location in the infrastruc-ture. Secondly, how can the proposed method be used to insure automatic connectiv-ity anywhere between clients and services offered by the device, in particular associ-ated sensors and actuators. Thirdly, how can the grouping and support be combinedand used to dynamically associate sensors from across the Internet with applications,assuming that the aforementioned grouping exists. The proposed solution to the firstissue is to store identifier-locator pairs in an overlay. For the second issue we pro-pose a sensor socket introduced which exploits the identifier/locator pairs to enabledevice mobility. The third issue is addressed by providing a group-cast operation inthe sensor socket. This arrangement allows communication with peers determinedby a grouping algorithm which operates on context information on the context over-lay. Thus we have enabled the creation of automated dynamic clustering of sensorsand actuators in the Internet of Things.The sensor socket is designed as a stand-alone module to support any contextoverlay that provides the same basic functionality. The sensor socket embodiesa support to automatically interconnect and communicate with devices. Using abridging software, remote devices can be dynamically found and inserted into legacylocal area network where current devices can benefit from the connectivity. For fu-ture work the bridge can be extended to actively locate and identify nearby sensorsthat are unable to participate in the overlay network otherwise.

Place, publisher, year, edition, pages
Sundsvall: Mid Sweden University, 2011. p. 46
Series
Mid Sweden University licentiate thesis, ISSN 1652-8948 ; 60
National Category
Computer Sciences
Identifiers
urn:nbn:se:miun:diva-13953 (URN)STC (Local ID)978-91-86694-38-8 (ISBN)STC (Archive number)STC (OAI)
Presentation
2011-04-28, O102, Sundsvall, 08:26
Supervisors
Available from: 2011-06-10 Created: 2011-06-10 Last updated: 2018-01-12Bibliographically approved

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Kanter, TheoPettersson, StefanForsström, StefanKardeby, VictorNorling, RogerWalters, JamieÖsterberg, Patrik

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