1. Fraunhofer FOKUS Context Management in Dynamic Environments IWCMC 2009, June 2009 Jens Tiemann Humberto Astudillo Evgenij Belikov Fraunhofer Institute for Open Communication Systems

2. Fraunhofer FOKUS 2 Context Management in Dynamic Environments – IWCMC 2009 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

3. Fraunhofer FOKUS 3 Context Management in Dynamic Environments – IWCMC 2009 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 Location Based Services Tracking, monitoring, navigation, Virtual Fence Guide-, recommender-, Social-networking-systems Always Best Connected  In-network management

4. Fraunhofer FOKUS 4 Context Management in Dynamic Environments – IWCMC 2009 CCDS Architecture (1) Context-Management is crucial for fulfilling the requirements of highly dynamic mobile networks CCDS provides infrastructure for context-awareness

5. Fraunhofer FOKUS 5 Context Management in Dynamic Environments – IWCMC 2009 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

6. Fraunhofer FOKUS 6 Context Management in Dynamic Environments – IWCMC 2009 IPFIX Architecture (1) Network context is crucial for self-configuration and optimal performance of given network IPFIX originates from network measurement/management information model, transport protocol, architecture

7. Fraunhofer FOKUS 7 Context Management in Dynamic Environments – IWCMC 2009 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

8. Fraunhofer FOKUS 8 Context Management in Dynamic Environments – IWCMC 2009 Composite Architecture CCDS used to control and configure IPFIX components IPFIX is used to accomplish measurement tasks Context Usage may further provide aggregated context

9. Fraunhofer FOKUS 9 Context Management in Dynamic Environments – IWCMC 2009 Closer Look: Location Context Source Capable of sensing and providing location context Adds Quality of Context (QoC) to enrich the context sent

10. Fraunhofer FOKUS 10 Context Management in Dynamic Environments – IWCMC 2009 Scenario: Location Context Service

11. Fraunhofer FOKUS 11 Context Management in Dynamic Environments – IWCMC 2009 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

12. Fraunhofer FOKUS 12 Context Management in Dynamic Environments – IWCMC 2009 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

13. Fraunhofer FOKUS 13 Context Management in Dynamic Environments – IWCMC 2009 Any Questions? Thank you for your attention! Contact: evgenij.belikov@fokus.fraunhofer.de jens.tiemann@fokus.fraunhofer.de Info: http://www.fokus.fraunhofer.de/go/ipfix http://www.fokus.fraunhofer.de/go/ccds

14. Fraunhofer FOKUS 14 Context Management in Dynamic Environments – IWCMC 2009 CCDS Protocol  Pull  Push

15. Fraunhofer FOKUS 15 Context Management in Dynamic Environments – IWCMC 2009 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

16. Fraunhofer FOKUS 16 Context Management in Dynamic Environments – IWCMC 2009 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/

17. Fraunhofer Institute for Open Communication Systems Kaiserin-Augusta-Allee 31 10589 Berlin, Germany www.fokus.fraunhofer.de Jens Tiemann jens.tiemann@fokus.fraunhofer.de