ChinaCom2009-Advances in Internet Symposium

Research Article

Distributed Context Support for Ubiquitous Mobile Awareness Services

  • @INPROCEEDINGS{10.1109/CHINACOM.2009.5339728,
        author={Theo Kanter and Stefan Pettersson and Stefan Forsstr\o{}m and Victor Kardeby and Roge Norling and Jamie Walters and Patrik \O{}sterberg},
        title={Distributed Context Support for Ubiquitous Mobile Awareness Services},
        proceedings={ChinaCom2009-Advances in Internet Symposium},
  • Theo Kanter
    Stefan Pettersson
    Stefan Forsström
    Victor Kardeby
    Roge Norling
    Jamie Walters
    Patrik Österberg
    Year: 2009
    Distributed Context Support for Ubiquitous Mobile Awareness Services
    DOI: 10.1109/CHINACOM.2009.5339728
Theo Kanter1,*, Stefan Pettersson1,*, Stefan Forsström1,*, Victor Kardeby1,*, Roge Norling1,*, Jamie Walters1,*, Patrik Österberg1,*
  • 1: Department of Information Technology and Media Mid Sweden University SE-851 70 Sundsvall, Sweden
*Contact email:,,,,,,


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.