An architecture to provide quality of service in OGC SWE Context

Transcription

1 An architecture to provide quality of service in OGC SWE Context Thiago Caproni Tavares 14th November, 2013 Thiago Caproni Tavares () SWARCH 14th November, / 40

2 Outline 1 About Me 2 Introduction Motivation Main Objective 3 Background Information Model Interface Model 4 SWARCH 5 Performance Evaluation Experiment Design Results 6 Conclusions Thiago Caproni Tavares () SWARCH 14th November, / 40

3 Outline 1 About Me 2 Introduction Motivation Main Objective 3 Background Information Model Interface Model 4 SWARCH 5 Performance Evaluation Experiment Design Results 6 Conclusions Thiago Caproni Tavares () SWARCH 14th November, / 40

4 About Me Undergraduate degree at Pontifical Catholic University of Minas Gerais (PUC Minas); Master degree at ICMC - University of São Paulo; PhD Student at ICMC - University of São Paulo; Lecturer at Federal Institute of Education, Science, and Technology in Minas Gerais Southern (IFSULDEMINAS); Thiago Caproni Tavares () SWARCH 14th November, / 40

5 USP São Paulo Bauru Ribeirão Preto São Carlos Piracicaba Pirassununga Lorena Thiago Caproni Tavares () SWARCH 14th November, / 40

6 ICMC/USP - City of São Carlos Thiago Caproni Tavares () SWARCH 14th November, / 40

7 ICMC/USP - City of São Carlos Thiago Caproni Tavares () SWARCH 14th November, / 40

8 IFSULDEMINAS Inconfidentes Machado Muzambinho Passos Poços de Caldas Pouso Alegre Thiago Caproni Tavares () SWARCH 14th November, / 40

9 IFSULDEMINAS - City of Inconfidentes Thiago Caproni Tavares () SWARCH 14th November, / 40

10 IFSULDEMINAS - City of Inconfidentes Thiago Caproni Tavares () SWARCH 14th November, / 40

11 Outline 1 About Me 2 Introduction Motivation Main Objective 3 Background Information Model Interface Model 4 SWARCH 5 Performance Evaluation Experiment Design Results 6 Conclusions Thiago Caproni Tavares () SWARCH 14th November, / 40

12 Motivation SOA is an emergent area in Sensor Networks; Quality of Services on SWE standards is still under explored: OGC standards provide an important framework for addressing semantics, but more work needs to be done to enable fusion of data from diverse sensor types. Data quality and quality of service are important issues to be addressed in sensor web standards development activities [OGC, 2013b] Thiago Caproni Tavares () SWARCH 14th November, / 40

13 Main Objective It aims to provide an architecture named SWARCH, which offers quality of services to SWE standards. Thiago Caproni Tavares () SWARCH 14th November, / 40

14 Outline 1 About Me 2 Introduction Motivation Main Objective 3 Background Information Model Interface Model 4 SWARCH 5 Performance Evaluation Experiment Design Results 6 Conclusions Thiago Caproni Tavares () SWARCH 14th November, / 40

15 Sensor Platforms [Akyildiz and Vuran, 2010] Thiago Caproni Tavares () SWARCH 14th November, / 40

16 Sensor Network Abstraction Requirements: Technology Interoperability; Uniform Data Access [Chen and Varshney, 2004]; Ontology for Data Format Homogenization; Service Discovery; Metadata; Processing; Thiago Caproni Tavares () SWARCH 14th November, / 40

17 Sensor Network Abstractions Thiago Caproni Tavares () SWARCH 14th November, / 40

18 OGC Sensor Web Enablement OGC SWE: Open Geospatial Consortium: Sensor Web Enablement: The Sensor Web Enablement standards enable developers to make all types of sensors, transducers and sensor data repositories discoverable, accessible and useable via Web. [OGC, 2013a] Thiago Caproni Tavares () SWARCH 14th November, / 40

19 Information Model [Bröring et al., 2011] SWE Common 2.0 Defines data types shared by multiple specifications; Observation & Measurements (O&M): Defines an encoding to describe observations; Sensor Model Language (SensorML): Defines an XML encoding for the description of all kinds of sensors; Thiago Caproni Tavares () SWARCH 14th November, / 40

20 Interface Model [Bröring et al., 2011] Sensor Observation Service: Provides an interface to get sensor observations; Sensor Event Service: Provides an interface to subscribe alerts; Sensor Instance Registry: Provides an interface to manage and search sensor metadata; Thiago Caproni Tavares () SWARCH 14th November, / 40

21 Sensor Observation Service GetCapabilities: Gets information about the service; DescribeSensor: Gets the description of a sensor or sensor system; GetObservation: Gets an observation set filtered by different criteria (time, location, etc); RegisterSensor: Allows to add new sensors; InsertObservation: Allows to add new observations to a specific sensor; Thiago Caproni Tavares () SWARCH 14th November, / 40

22 GetObservation (SOS) <GetObservation > < offering > OFFERING </ offering > < eventtime > <ogc:tm_during > <ogc:propertyname >om:samplingtime </ ogc:propertyname > <gml:timeperiod > <gml:beginposition > T17:00: :00 </ gml:beginposition > <gml:endposition > T18:00: :00 </ gml:endposition > </ gml:timeperiod > </ ogc:tm_during > </ eventtime > <observedproperty > observedproperty </ observedproperty > <responseformat >text /xml ; subtype=& quot ;om /1.0.0& quot ;</ responseformat > </ GetObservation > Thiago Caproni Tavares () SWARCH 14th November, / 40

23 Sensor Event Service Level 1: Allows the sensor registration by a XPath expression; Level 2: Allows the filters registration (temporal, location and comparing through Filter Encoding Specification); Level 3: Allows the determination of multiple filters; Thiago Caproni Tavares () SWARCH 14th November, / 40

24 Subscribe - Level 1 (SES) <? xml version=" 1.0 " encoding="utf -8"?> <soap:envelope xmlns:soap=" http: // /2003/05/ soap - envelope " xmlns:wsa=" http: // /2005/08/ addressing " xmlns:wsnt=" http: // docs.oasis -open.org /wsn /b -2"> <soap:header > < wsa:to > host url </ wsa:to > < wsa:action > http: // docs.oasis -open.org /wsn /bw -2/ NotificationProducer / SubscribeRequest </ wsa:action > < wsa:from > <wsa:address >http: // /2005/08/ addressing /role / anonymous</ wsa:address > </ wsa:from > </ soap:header > < soap:body > <wsnt:subscribe > <wsnt:consumerreference > <wsa:address > consumer url </ wsa:address > </ wsnt:consumerreference > <wsnt:filter > <wsnt:messagecontent Dialect=" http: // /TR /1999/ REC -xpath " xmlns:xlink=" http: // /1999/ xlink " xmlns:om =" http: // www. opengis.net /om /1.0 "> // om:observation / om:procedure = water_gauge_sensor -1 </ wsnt:messagecontent > </ wsnt:filter > </ wsnt:subscribe > </ soap:body > </ soap:envelope > Thiago Caproni Tavares () SWARCH 14th November, / 40

25 Sensor Instance Registry Provides an interface to manage sensor metadata; These metadata are encoding with SensorML; Searches are executed by: Service Type; Phenomena; Location; Description; Sensor ID; Thiago Caproni Tavares () SWARCH 14th November, / 40

26 SearchSensorRequest (SIR) < sir:searchsensorrequest service =" SIR " > <sir:searchcriteria > <ServiceCriteria > <ServiceType > SES </ ServiceType > </ ServiceCriteria > <sir:phenomenon > <sir:phenomenonname > urn:ogc:def:property:ogc:1.0 :waterlevelconcentration </ sir:phenomenonname > </ sir:phenomenon > </ sir:searchcriteria > </ sir:searchsensorrequest > Thiago Caproni Tavares () SWARCH 14th November, / 40

27 Outline 1 About Me 2 Introduction Motivation Main Objective 3 Background Information Model Interface Model 4 SWARCH 5 Performance Evaluation Experiment Design Results 6 Conclusions Thiago Caproni Tavares () SWARCH 14th November, / 40

28 Sensor Web Architecture Traditional SWE Thiago Caproni Tavares () SWARCH 14th November, / 40

29 Sensor Web Architecture SWARCH Thiago Caproni Tavares () SWARCH 14th November, / 40

30 SearchSensor Message + QoS Parameters < tns:searchsensor > < tns:request > < sir:searchsensorrequest > < sir:searchcriteria >... </ sir:searchcriteria > </ sir:searchsensorrequest > </ tns:request > < tns:qosparameter > < parameter > rt </ parameter > < operator > le </ operator > <value > 200 </ value > </ tns:qosparameter > </ tns:searchsensor Thiago Caproni Tavares () SWARCH 14th November, / 40

31 Outline 1 About Me 2 Introduction Motivation Main Objective 3 Background Information Model Interface Model 4 SWARCH 5 Performance Evaluation Experiment Design Results 6 Conclusions Thiago Caproni Tavares () SWARCH 14th November, / 40

32 Evaluation Scenario Virtual Machines Capability Quant Proc. Mem. Disk Low MB 15 GB Medium GB 15 GB High GB 15 GB Tabela: Virtual Machine Settings Thiago Caproni Tavares () SWARCH 14th November, / 40

33 LaSDPC - Cluster Thiago Caproni Tavares () SWARCH 14th November, / 40

34 Experiment Design Factors Experiments Broker Threads 1 No Broker 10, 20, Broker 10, 20, Tabela: Experiment Types Metric Response Time Thiago Caproni Tavares () SWARCH 14th November, / 40

35 Results Thiago Caproni Tavares () SWARCH 14th November, / 40

36 Sensor Observation Service (SOS) Thiago Caproni Tavares () SWARCH 14th November, / 40

37 Sensor Observation Service (SOS) Thiago Caproni Tavares () SWARCH 14th November, / 40

38 Sensor Event Service (SES) Thiago Caproni Tavares () SWARCH 14th November, / 40

39 Sensor Event Service (SES) Thiago Caproni Tavares () SWARCH 14th November, / 40

40 Broker Influence Thiago Caproni Tavares () SWARCH 14th November, / 40

41 Broker Influence Thiago Caproni Tavares () SWARCH 14th November, / 40

42 Outline 1 About Me 2 Introduction Motivation Main Objective 3 Background Information Model Interface Model 4 SWARCH 5 Performance Evaluation Experiment Design Results 6 Conclusions Thiago Caproni Tavares () SWARCH 14th November, / 40

43 Conclusions and Future Works Include a broker in the search interaction between clients and services providers can improve the access quality to the SWE services; The implemented prototype has reduced the response times in our evaluation; Next steps: Improve the mechanism to select and evaluate the parameters of quality of service: [Reiff-marganiec et al., 2007]; [Yu and Reiff-marganiec, 2008]; Add others QoS parameters in the architecture; Thiago Caproni Tavares () SWARCH 14th November, / 40

44 References I Akyildiz, I. and Vuran, M. C. (2010). Wireless Sensor Networks. John Wiley & Sons, Inc., New York, NY, USA. Bröring, A., Echterhoff, J., Jirka, S., Simonis, I., Everding, T., Stasch, C., Liang, S., and Lemmens, R. (2011). New generation sensor web enablement. Sensors, 11(3): Chen, D. and Varshney, P. K. (2004). Qos support in wireless sensor networks: A survey. In International Conference on Wireless Networks 04, pages OGC (2013a). Sensor web enablement (swe). Available in: Last Access: 06/05/2013. OGC (2013b). Why is the ogc involved in sensor webs? Available in: Last Acces: 09/05/2013. Reiff-marganiec, S., Yu, H. Q., and Tilly, M. (2007). Service selection based on non-functional properties. In In Proceedings of Non Functional Properties and Service Level Agreements in Service Oriented Computing Workshop. Springer. Yu, H. Q. and Reiff-marganiec, S. (2008). Non-functional property based service selection: A survey and classification of approaches. Thiago Caproni Tavares () SWARCH 14th November, / 40

45 Thanks... Thiago Caproni Tavares () SWARCH 14th November, / 40