Dan Johansson

Context-aware application mobility support in pervasive computing environments

In the future, application mobility can play a crucial role and prove to be an enabler for next generation distributed applications. Application mobility lets an application follow the users while they roam between networks using several devices. In order to achieve seamless application mobility, several issues need to be considered such as device heterogeneity, GUI-adaptation and application loss. Thus, in this paper our contributions are two-fold. Firstly, we present our novel architecture called the Application Mobility Manager (A2M) which provides seamless application mobility. The proposed architecture is context-aware and decentralized. Finally, we present a novel application called the Mobile YouTube Player which is capable of moving between heterogeneous devices and provide users with seamless video experience. We validate the proposed system through rigorous experimentation and user studies based on the real-world test bed and prototype implementation. The results clearly validate that the proposed system can support seamless application mobility.

Mobile e-services using HTML5

New mobile networks and new devices like smartphones and tablets are rapidly changing opportunities for public sector units delivering smart, mobile e-services to their citizens. Moreover, the upcoming HTML5 standard allows for cross-device and cross-browser support making service development and deployment much more easier than before at lower costs. This paper analyzes the most important features of HTML5, CSS3, and WebGL and their applicability for mobile e-services in the public sector. Also, we present a novel architecture for mobile e-services using HTML5, mashups, and RESTful web APIs as important building blocks.

Web-based adaptive application mobility

Application mobility is achieved when migrating an application with its code, states and all related information from one device to another during its execution. As traditional applications are being challenged by apps, we believe it is time to rethink the notion of application mobility and explore the concept from a web perspective. More specifically, this paper aims to address the challenges associated with application mobility through mapping these against features within modern web technologies, analyzing their ability to meet the specific requirements of application mobility. An architectural proposal is described where we deploy application mobility using web technologies. We show that the emerging HTML5 standard along with related API:s and frameworks can provide an environment for delivering application mobility that strongly meets the requirements of support for offline work and heterogeneous environments.

A Case Study of Application Development for Mobile and Location-Based Services

In this paper we present a case study of a location-dependent service, aimed for tourists. Two applications are developed, one based on native technologies, the other on HTML5 and related frameworks. We provide implementation details and compare the different solutions in terms of location support, compliance with required features, and cross-platform functionality. Our experiments show that web-based approaches may lead to significant benefits over using native technologies; both versions of the application displayed comparable location support and compliance with required features, while the web version superseded its native counterpart in cross-platform functionality.

A MIP-P2P based architecture for application mobility

Mobility exists in many shapes; when migrating a running application (code, states and data) from one device to another, one has achieved application mobility. In this article we combine this mobility type with context awareness, defining context awareness supported application mobility (CASAM) as when using context in the act of moving an application between hosts during its execution, to provide relevant information and/or services, where relevancy depends on the users task. We identify and present five CASAM challenges, that are used to create requirements for a CASAM architecture. A proposal for an architecture, building on peer-to-peer (P2P) technology in combination with mobile IP, is then presented, addressing the identified challenges, providing a decentralized framework for global application mobility. As such, our architecture differs from earlier centralized and/or locally bound solutions for application mobility.

Session mobility in multimedia services enabled by the cloud and peer-to-peer paradigms

Services based on new information technology offering audio and video modality are viewed among the most important today. When users change location or device there is a need to keep these media sessions active. The main purpose of this article is to present a lightweight framework that allows session mobility through making profit of the cloud and peer-to-peer paradigms, while at the same time fulfilling the prevailing requirements for new session mobility multimedia services. We demonstrate the principles of the framework by creating a real prototype, allowing combined video and audio sessions to be migrated between devices, thus showing successful implementation of session mobility meeting requirements such as low degree of service provider dependency, no changes to current common network infrastructure, dealing with privacy issues, providing flexibility and low cost, and letting the user control when and where to migrate the sessions. It is our belief that relatively new paradigms such as peer-to-peer computing and cloud services could enhance and support flexible session mobility in a mobile use context.

A cross-platform application framework for HTML5-based e-services

The e-service area is faced with unique challenges and opportunities as a new mobile IT-landscape emerges. Technical challenges such as heterogeneous devices and networks, scalability and ability to deliver e-services anytime, anywhere to the users must be met with the careful design of functional application platforms and means of distributing e-services in an efficient manner. In this paper, we present a novel cross-platform application framework for HTML5-based e-services. We analyse the framework, applying our NIMO model for development and deployment of e-Services, proving advantages concerning abstraction, availability and accessibility, as well as deployment and functionality.

Mobile e-Services: State of the Art, Focus Areas, and Future Directions

E-services are services delivered over the Internet. Such services have different properties and dimensions, e.g. targeting different sectors, being accessible through different channels, or intended for frequent or infrequent use. Throughout this article the authors address e-services from a mobility perspective. They do this by 1 positioning mobile e-services within the research field; 2 reviewing related work on mobile e-services; and 3 presenting and examining existing challenges both difficulties and opportunities when combining mobility and e-services. They see mobile e-services as the next generation of internet-based services and discuss important focus areas and future directions, giving extra notion to challenges and opportunities in the areas of acceptance and adoption, availability anytime and anywhere, and co-operation. In turn, these areas potentially set the scene for enhanced e-participation.

Supporting user mobility with peer-to-peer-based application mobility in heterogeneous networks

When migrating applications between devices during runtime, one has achieved application mobility. In this paper we present the XAM system, providing application mobility through a peer-to-peer based solution over heterogeneous networks. Our architecture takes into consideration established requirements of application mobility, being application identification and distribution; context-awareness and context quality; seamlessness; heterogeneity support; and usability. Our system differs from traditional systems as it provides application mobility in a decentralized manner over heterogeneous networks, using different communication technologies. Following the evaluation of our system, we also discuss major challenges and possibilities for the continuing evolution of application mobility systems.

Mobile e-Services and Open Data in e-Government Processes - Concept and Design

The traditional service life cycle starts with the formulation of required needs and ends with the adoption and ownership of the service. In an e-government context, this takes the form of citizens consuming services provided by the public sector bodies. We examine how a combination of mobile e-services and open data can extend and allow possible citizen-driven continuation of the service life cycle. The chosen method is a concept-driven approach, manifesting our concept in a digital prototype, which allows citizens to generate and acquire open data, as well as develop and publish their own e-services.