[HAIS'10] An embeddable fusion framework to manage context information in mobile devices
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[HAIS'10] An embeddable fusion framework to manage context information in mobile devices
- 1. Grupo de Procesado de Datos y Simulación ETSI de Telecomunicación Universidad Politécnica de Madrid CASanDRA mobile: An embeddable fusion framework to manage context information in mobile devices HAIS 2010 Ana M. Bernardos, Eva Madrazo, José R. Casar, Josué Iglesias {abernardos, jramon, josue}@grpss.ssr.upm.es
- 2. contents mobile middleware SOA and mobile OSGi CASanDRA: components and events CASanDRA: core system application example conclusions and future work CASanDRA mobile context fusion framework – HAIS 2010 abernardos@grpss.ssr.upm.es 2 / 20
- 3. contents mobile middleware SOA and mobile OSGi CASanDRA: components and events CASanDRA: core system application example conclusions and future work CASanDRA mobile context fusion framework – HAIS 2010 abernardos@grpss.ssr.upm.es 3 / 20
- 4. mobile middleware mobile middleware: Applications ContextFusion Subscription Network tools to simplify History Registry Discovery application development CASanDRA Core + process sensor data mobile middleware ENABLER ENABLER ENABLER ENABLER intelligently CASanDRA Context inference + SENSOR SENSOR SENSOR SENSOR hide specific sensor CASanDRA Acquisition characteristics Environment = CASanDRA mobile CASanDRA mobile context fusion framework – HAIS 2010 abernardos@grpss.ssr.upm.es 4 / 20
- 5. contents mobile middleware SOA and mobile OSGi CASanDRA: components and events CASanDRA: core system application example conclusions and future work CASanDRA mobile context fusion framework – HAIS 2010 abernardos@grpss.ssr.upm.es 5 / 20
- 6. mobile OSGi [SOA mobile OSGi: ] dynamic component framework for Java Applications bundle: reusable software unit ContextFusion Subscription Network reusability of components History Registry Discovery (bundles/services) aggregation of (context) data CASanDRA Core HW platform independence (Java-based) mobile middleware ENABLER ENABLER ENABLER ENABLER services in framework CASanDRA Context inference • resource discovery • event management SENSOR SENSOR SENSOR SENSOR • log • [...] CASanDRA Acquisition Environment = CASanDRA mobile CASanDRA mobile context fusion framework – HAIS 2010 abernardos@grpss.ssr.upm.es 6 / 20
- 7. contents mobile middleware SOA and mobile OSGi CASanDRA: components and events CASanDRA: core system application example conclusions and future work CASanDRA mobile context fusion framework – HAIS 2010 abernardos@grpss.ssr.upm.es 7 / 20
- 8. components and events components • SENSORS • encapsulate specific sensor characteristics • e.g.: GPS, temperature, etc. Applications Context API events • ENABLERS • process context information from: • SENSOR component ContextFusion Subscription Network • other ENABLER component • e.g.: activity recognition, location History Registry Discovery fusion, etc. CASanDRA Core • APPLICATIONS API Context Context API • adapt service to the user context events events context events SENSOR SENSOR … ENABLER ENABLER … •generation: • sensors, enablers CASanDRA Acquisition CASanDRA Context inference •consumers: • enablers and application CASanDRA mobile core system [] CASanDRA mobile context fusion framework – HAIS 2010 abernardos@grpss.ssr.upm.es 8 / 20
- 9. contents mobile middleware SOA and mobile OSGi CASanDRA: components and events CASanDRA: core system application example conclusions and future work CASanDRA mobile context fusion framework – HAIS 2010 abernardos@grpss.ssr.upm.es 9 / 20
- 10. core system SubscriptionManager Communications ContextFusion Manager MEASURE NAME SUBSCRIPTOR Manager Registry BT COM HTTP … BBDD / History MEASURE NAME COMPONENT Privacy Logging Manager Component Manager Discovery CASANDRA Core Context Context events events SENSOR SENSOR … ENABLER ENABLER … CASanDRA Acquisition CASanDRA Context Inference CASanDRA mobile context fusion framework – HAIS 2010 abernardos@grpss.ssr.upm.es 10 / 20
- 11. core system SubscriptionManager Communications ContextFusion Manager MEASURE NAME SUBSCRIPTOR Manager Registry BT COM HTTP … BBDD / History MEASURE NAME COMPONENT Privacy Logging Manager Component Manager Discovery CASANDRA Core Context Context events events Registry SENSOR SENSOR … ENABLER ENABLER … match between: CASanDRA Acquisition CASanDRA Context Inference •type of measure/context parameter •publisher component list of available context parameters CASanDRA mobile context fusion framework – HAIS 2010 abernardos@grpss.ssr.upm.es 11 / 20
- 12. core system SubscriptionManager Communications ContextFusion Manager MEASURE NAME SUBSCRIPTOR Manager Registry BT COM HTTP … BBDD / History MEASURE NAME COMPONENT Privacy Logging Manager Component Manager Discovery CASANDRA Core Context Context events events SENSOR SENSOR ENABLER ENABLER Discovery … … listening to new component CASanDRA Acquisition CASanDRA Context Inference registrations adding measure + component to the Registry CASanDRA mobile context fusion framework – HAIS 2010 abernardos@grpss.ssr.upm.es 12 / 20
- 13. core system SubscriptionManager Communications ContextFusion Manager MEASURE NAME SUBSCRIPTOR Manager Registry BT COM HTTP … BBDD / History MEASURE NAME COMPONENT Privacy Logging Manager Component Manager Discovery CASANDRA Core Context Context SubscriptionManager events events SENSOR SENSOR ENABLER ENABLER match between: … … •type of measure/context parameter CASanDRA Acquisition CASanDRA Context Inference •subscribed component + Registry list of required components to get measure/context parameter CASanDRA mobile context fusion framework – HAIS 2010 abernardos@grpss.ssr.upm.es 13 / 20
- 14. core system SubscriptionManager Communications ContextFusion Manager MEASURE NAME SUBSCRIPTOR Manager Registry BT COM HTTP … BBDD / History MEASURE NAME COMPONENT Privacy Logging Manager Component Manager Discovery CASANDRA Core Context Context events events SENSOR SENSOR … ENABLER ENABLER … ComponentManager CASanDRA Acquisition CASanDRA Context Inference manages component life cycle: • SubscriptionManager + Registry START/STOP components CASanDRA mobile context fusion framework – HAIS 2010 abernardos@grpss.ssr.upm.es 14 / 20
- 15. core system SubscriptionManager Communications ContextFusion Manager MEASURE NAME SUBSCRIPTOR Manager Registry BT COM HTTP … BBDD / History MEASURE NAME COMPONENT Privacy Logging Manager Component Manager Discovery CASANDRA Core Context Context events events SENSOR SENSOR … ENABLER ENABLER … ContextFusionManager •manages new subscriptions CASanDRA Acquisition CASanDRA Context Inference •store measures/context parameters •menages events from/to components CASanDRA mobile context fusion framework – HAIS 2010 abernardos@grpss.ssr.upm.es 15 / 20
- 16. core system SubscriptionManager Communications ContextFusion Manager MEASURE NAME SUBSCRIPTOR Manager Registry BT COM HTTP … BBDD / History MEASURE NAME COMPONENT Privacy Logging Manager Component Manager Discovery CASANDRA Core Context Context events events CommunicationsManager SENSOR SENSOR … ENABLER ENABLER … centralizes access to available communication interfaces CASanDRA Acquisition CASanDRA Context Inference PrivacyManager Loggin CASanDRA mobile context fusion framework – HAIS 2010 abernardos@grpss.ssr.upm.es 16 / 20
- 17. contents mobile middleware SOA and mobile OSGi CASanDRA: components and events CASanDRA: core system application example conclusions and future work CASanDRA mobile context fusion framework – HAIS 2010 abernardos@grpss.ssr.upm.es 17 / 20
- 18. application example Application Application Application UI Subscriptor Logic User events management Activity CASanDRA Core SubscriptionManager component activity InferenceEng. ContextFusion location/gps InferenceEng. subscription Manager accelerometer ActivityEnabler •enablers User activity Application •applications BBDD / History Registry location/gps GPSSensor register components Component accelerometer AccSensor •sensors Manager activity ActivityEnabler •enablers User activity InferenceEng. Accel Activity Activity & User start components Accel location data data location Activity Activity Inference SENSOR SENSOR Enabler Engine dynamic rules API Accel. GPS Rules configuration CASanDRA CASanDRA configuration Acquisition Context inference CASanDRA mobile context fusion framework – HAIS 2010 abernardos@grpss.ssr.upm.es 18 / 20
- 19. contents mobile middleware SOA and mobile OSGi CASanDRA: components and events CASanDRA: core system application example conclusions and future work CASanDRA mobile context fusion framework – HAIS 2010 abernardos@grpss.ssr.upm.es 19 / 20
- 20. conclusions and future work • this first version of CASanDRA demostrates the feasibility and convenience of building the framework on the service oriented architecture implemented through mOSGi future work we are already working on: a light strategy for ‘quality of context’ control during all the fusion process a fusion module to manage position estimation in a seamless manner an stable activity inference system which uses Bayesian performance logic tests a model for context sharing among different devices with the objective of improving context estimation and a reasoning service including ontology processing CASanDRA mobile context fusion framework – HAIS 2010 abernardos@grpss.ssr.upm.es 20 / 20
- 21. any question? CASanDRA mobile context fusion framework – HAIS 2010 abernardos@grpss.ssr.upm.es 21 / 20
- 22. CASanDRA mobile context fusion framework – HAIS 2010 abernardos@grpss.ssr.upm.es 22 / 20
- 23. mobile OSGi OSGi Framework Service registry Bundle Bundle packages packages JAVA Operating System Hardware CASanDRA mobile context fusion framework – HAIS 2010 abernardos@grpss.ssr.upm.es 23 / 20
Hinweis der Redaktion
- Hello, welcome everybody. My name’s Josué, I work for the GPDS group in UPM, there in Madrid and I’m going to talk about CASanDRA mobile, that is: “an embeddable fusion framework to manage context information in mobile devices”.
- My speech is mainly divided in 3 big sections: first, I will introduce the mobile middleware and SOA concepts,arguing why we chose mobile OSGi as service platform later, next section will cover all the differents functional blocks of CASanDRA, our particular solution and finally, I will show you and application example using CASanDRA and wil talk about conclusions and future works
- Well, nowadays mobile devices can be used to get a dynamic view of the user situation, in part thanks to new communication and embedded sensor technologies. In this scenario mobile middleware appears so final applications can abstract their implementation from the particularities of the environment, that is, to: hide the specific sensor characteristics process in an intelligent way the data acquired from sensors and offer a set of software tools in order to manage all this information, that is, simplifying application development. Well, in this sense, CASanDRA mobile can be considered a mobile middleware.
- Well, when implementing this mobile middleware we have choose a Service Oriented approach, in particular mobileOSGi, as the base architecture of our middleware mobileOSGi is a dynamic component framework for Java that wraps its software inside a reusable unit called bundle We are going to use this bundles as reusable services in a flexible way being able to aggregate context data from different services We have also used mobileOSGI as it is HW platform independent and it offers a set of already developed services that we are used in order to build CASanDRA mobile (resource discovery, event or log management, etc.)
- Now talking about CASanDRA mobile, our particular approach,I’m going to start talking about what we have called “components”, that is: the entities that generate or consume contextual information.
- There are 3 kind of components: SENSORS: that encapsulates specific sensor characteristics GPS, temperature or other kind of sensor ENABLERS: that are able of processing information coming from sensors (or from other enablers) we can think in a “activity recognition enabler” or another kind of data fusion or processing APPLICATIONS: just adapt their offered functionality based of the user context These components uses the core system to communicate among them by means of context events: sensors just are able to generate context events enablers can both: generate and receive context events and finally applications can only receive context events
- The CASanDRA mobile core is formed by several funtional blocks
- The REGISTRY establish a match between a component and the measure (or context parameter) it offers (we talk about “measures” when dealing with sensors and “context parameters” when dealing with “enablers”; there’s no room here for applications as they cannot generate measures; from now own I will be always talking about “measures” when referring to both, measured and context parameters) This functional block is used by CASanDRA in other to know at each time what measures/context parameters are available
- The DISCOVERY functional block is in charge of listening to new components. When a new component is discovered it is added to the registry list we have just talk about.
- In order to support aggregation of context data from several sources, The SUBSCRIPTION MANAGER associates a component with the measures it is subscribed to In this case, the present components in this subscription manager can only be ENABLERS or APPLICATIONS, not SENSORS as sensors cannot receive (cannot be subscribed to) any measure.
- Once a component is subscribed to a measure, this Component Manager is in charge of starting any other necessary component to get that measure. To do so, the Registry would have to be consulted in order to know what component offers what measure. So finally, in a kind of chained process, Component Manager will get to have every necessary component working.
- Apart from managing new subscriptions and storing the generated measures, the main aim of the ContextFusionManager is to manage the events from/to components, mainly accesing the data stored in the Subscription Manager.
- Apart from those specific functional blocks, CASanDRA mobile core system also offers some general services as: A CommunicationManager to access the data obtained by the different communication technologies present in the mobile device A PrivacyManager to ensure privacy and security issues. Or a loggin service.
- Well, that’s all about CASanDRA. Now I will show you an simple example in order to settle these concepts I have just mentioned.
- This is a quite simple example of how to build an user activity recognition system using CASanDRA. As I said, CASanDRA is a component-based middleware so first thing we have to do is register new components we can do so adding new entries to the Registry stating what measure is offered by what component (so we just need to register SENSORs or ENABLERs) in this example … next, some components may need extra information, so we may need to subscribe them to some of the measures offered by other components this is state in the SubscriptionManager (in this case, this apply just to application or enabler components, not sensor) in this example … just after there exist any subscription, ComponentManager will start every required component now that every component is activated, the ContextFusionManager can start managing the events it received, delivering these events according the SubscriptionManager list. so, in this example … finally, during CASanDRA operation, any component can be configured online in this example, an application may need to change the rules executed by the inference engine
- ... just because most of the mobileOSGi advantages fits perfectly in the needs that mobile middlewares have And as future work in order to improve this first version of mobile CASanDRA, we are working on: extending the core system with a ... QoC context sharing developing new components like a fusion component to an stable activity inference ontology-based reasoning service