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Fraunhofer FOKUS Context Management in Dynamic Environments IWCMC 2009, June 2009 Jens Tiemann Humberto Astudillo Evgenij Belikov Fraunhofer Institute for Open Communication Systems Fraunhofer FOKUS Overview Motivation and Goal Context Management using Context Coordination and Dissemination System (CCDS) Architecture/Protocol Continuous Data Transport using IP Flow Information eXport (IPFIX) Architecture/Protocol Composite Approach Location Context Source Location Context Service Conclusion and Future Work 2 Context Management in Dynamic Environments – IWCMC 2009 Fraunhofer FOKUS Motivation and Goal Context-Awareness is key enabler of self-management Self-x features facilitate seamless interaction between users, services and devices in heterogeneous mobile networks and dynamic environments Increasing mobility due to widespread wireless networks and portable devices 3 Location Based Services Tracking, monitoring, navigation, Virtual Fence Guide-, recommender-, Social-networking-systems Always Best Connected In-network management Context Management in Dynamic Environments – IWCMC 2009 Fraunhofer FOKUS CCDS Architecture (1) Directory Application / Context Usage CCDS init / config control Provider data requests Consumer data Context Source Context-Management is crucial for fulfilling the requirements of highly dynamic mobile networks CCDS provides infrastructure for context-awareness 4 Context Management in Dynamic Environments – IWCMC 2009 Fraunhofer FOKUS CCDS Architecture (2) Components • Provider – interface to source of context/information • Consumer – aggregator or end-user of context • Directory – mediator between Providers and Consumers Communication Models • Pull – based on requests from Consumer • Push – asynchrounous event-based notifications from Provider Message types: resolve, register, get, subscribe, notify Prototype implementation available Suitable for handling high-level discrete data 5 Context Management in Dynamic Environments – IWCMC 2009 Fraunhofer FOKUS IPFIX Architecture (1) Application Exporter Metering / Measurement Collector IPFIX Network context is crucial for self-configuration and optimal performance of given network IPFIX originates from network measurement/management • information model, transport protocol, architecture 6 Context Management in Dynamic Environments – IWCMC 2009 Fraunhofer FOKUS IPFIX Architecture (2) Emerging IETF-standard (RFCs 3955, 5101) Used in network management and accounting systems Efficient implementation available Components: • Exporter – source of measurement data • Collector – sink/user of measurement data Push-based communication model Binary encoding based on templates • Suitable for voluminous low-level continous data • Supports extension of data formats on-the-fly 7 Context Management in Dynamic Environments – IWCMC 2009 Fraunhofer FOKUS Composite Architecture Directory Application / Context Usage CCDS init / config control Provider discrete data requests Consumer data config continuous data Exporter data Collector IPFIX Metering / Measurement Context Preparation Context Usage CCDS used to control and configure IPFIX components IPFIX is used to accomplish measurement tasks Context Usage may further provide aggregated context 8 Context Management in Dynamic Environments – IWCMC 2009 Fraunhofer FOKUS Closer Look: Location Context Source Directory CCDS addressing GPS Receiver CCDS control init / config Provider Memory / Preprocessing other Sensor config Exporter discrete data over CCDS Context Usage / Decision Process continuous data over IPFIX Location Context Source Capable of sensing and providing location context Adds Quality of Context (QoC) to enrich the context sent 9 Context Management in Dynamic Environments – IWCMC 2009 Fraunhofer FOKUS Scenario: Location Context Service 10 Context Management in Dynamic Environments – IWCMC 2009 Fraunhofer FOKUS Location-Context Service (2) Virtual Fence scenario Mobile entities equipped with location context sources Location context is used to alert a monitoring component whenever some forbidden area is entered by an entity Context-aggregators play hybrid role of acquiring preprocessed location context and providing meaningful higher level context information to the application Application is decoupled from context management tasks Generalized architecture is moreover applicable in different further scenarios briefly mentioned before 11 Context Management in Dynamic Environments – IWCMC 2009 Fraunhofer FOKUS Conclusion and Future Work Combination of CCDS with IPFIX network measurements standard in a proof of concept implementation Proposed architecture is suitable for dynamic environments Supports autonomic decision-making process with focus on self-management of network nodes Further extension of libccds and libipfix Introducing learning and history context utilization as further support for decision-making Node Collaboration System Toward collaborative decision-making 12 Context Management in Dynamic Environments – IWCMC 2009 Fraunhofer FOKUS Any Questions? Thank you for your attention! Contact: • [email protected] • [email protected] Info: • http://www.fokus.fraunhofer.de/go/ipfix • http://www.fokus.fraunhofer.de/go/ccds 13 Context Management in Dynamic Environments – IWCMC 2009 Fraunhofer FOKUS CCDS Protocol Pull Push 14 Context Management in Dynamic Environments – IWCMC 2009 Fraunhofer FOKUS Implementation Details Both libraries implemented in C (Java Interface available for IPFIX) Event-driven programming • main loop • event types • event handling • message handling text objects in XML alike format CCDS: UDP (with response messages) IPFIX: UDP, TCP or preferably SCTP 15 Context Management in Dynamic Environments – IWCMC 2009 Fraunhofer FOKUS Acknowledgement This work was partly performed in project E3 which has received research funding from the Community's Seventh Framework programme. This paper reflects only the authors' views and the Community is not liable for any use that may be made of the information contained therein. The contributions of colleagues from E3 consortium are hereby acknowledged. E3 – End-to-End Efficiency “Evolving current heterogeneous wireless system infrastructures into an integrated, scalable and efficiently managed B3G cognitive system framework.” https://ict-e3.eu/ 16 Context Management in Dynamic Environments – IWCMC 2009 Fraunhofer Institute for Open Communication Systems Kaiserin-Augusta-Allee 31 10589 Berlin, Germany www.fokus.fraunhofer.de Jens Tiemann [email protected]