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A Policy-Based Framework for e-Health Application

A Policy-Based Framework for e-Health Application. Jatinder Singh Jean Bacon Ken Moody University of Cambridge. Giovanni Russello Changyu Dong Naranker Dulay Imperial College London. Caregrid Project. Main project goal :

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A Policy-Based Framework for e-Health Application

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  1. A Policy-Based Framework for e-Health Application Jatinder Singh Jean Bacon Ken Moody University of Cambridge Giovanni RusselloChangyu DongNaranker DulayImperial College London E-Science

  2. Caregrid Project Main project goal: Enhancements for development and deployment of healthcare applications Key features: trust, security, privacy and context models Results: working towards therealisation of a middleware E-Science

  3. Challenges • Scalability: healthcare applications range from small-scale body sensor networks up to large-scale distributed systems • Flexibility: dynamic environments and unpredictable scenarios • Manageability: users and resources change unpredictably over time E-Science

  4. Assisted living Treating and monitoring patients at home (or in sheltered houses) Carers visit the patients and provide the necessary medical care to their case Installing hardware and software for • Monitoring (body sensors, infrared cameras, etc.) • Assisting patients and cares • Providing appropriate security and privacy E-Science

  5. Framework Components • Ponder2 for management of Entities and Resources • Domain organisation • Authorisation and Obligation policies • Communication by means of Event-based middleware • Distribution of events for interaction • Prioritising events E-Science

  6. Entity and Resource Organisation Ponder2 allows the specification of hierarchical domain structures that contains Managed Objects • An Entity (such as a doctor) is defined by means of a Managed Object Template (MOT) • Managed Object Instance (MOI) is used to represent a specific instance of an Entity • Resources are represented by means of simple Managed Objects. E-Science

  7. An MOT Example < Root Domain < Sub-domain for carers < Sub-domain for Doctors < MOT specification for Doctors E-Science

  8. MOI Instantiation Entity E Presenting Credentials Finding the matching MOT Instantiating an MOI for a doctor E-Science

  9. Authorisation Policies Define the set of access rights that a subject has on a target auth+/-subject, action, target when condition E-Science

  10. Obligation Policies • Event-Condition-Action for dynamically adapting the system to changes on Event when Condition do Action E-Science

  11. Obligation Policies • Capture obligations entities must fulfil oblig MedicineIntakePolicy after 3h 50min from MedSwallowedEvt -> AlertEvt unless MedSwallowedEvt after 4h 10min from MedSwallowedEvt -> AlarmEvt unless MedSwallowedEvt on MedSwallowedEvt do log("medicine taken", time); on AlertEvent do alertPatient("Medicine in 10 min"); on AlarmEvent do sendAlarmToGP("No medicine taken"); E-Science

  12. Practical Case: Edema Case Study Edema refers to swelling caused by excess fluid retention Carers regularly visit patients at home and perform: • Monitoring by measurements • Providing appropriate medications E-Science

  13. Case Study in Details • Deployment in the home environment • Carers visiting the patient’s home: • Authentication when access home • Guiding the carers in their tasks • Leaving the patient’s home E-Science

  14. Deployment • Carers could use PDA carrying the necessary data and software • In the sheltered house: • Sensors for monitoring the patients • PC and set-up boxes for storing data • TV and phones for communication E-Science

  15. Domain Structures for the Edema Case Study E-Science

  16. Controlling the Access to Resources E-Science

  17. Fulfilment of Obligations oblig BMPolicy after 30min from NurseInEvt -> AlertBMEvt unless BMTakenEvt after 10min from NurseOutEvt -> Alert2BMEvt unless NurseInEvt or BMTakenEvt after 30min from NurseOutEvt -> HNotifyBMEvt unless EmergEvt or BMTakenEvt on BMTakenEvt do log("MB taken", time); on AlertBMEvt do alertNurse("BM within 30 min"); on Alert2BMEvt do alertNurse("Departed without BM"); on HNotifyBMEvt do sendNotToHosp("No BMtaken"); E-Science

  18. Leaving the Home Domain When the carer completes the tasks and leaves allocated resources must be relinquished. Obligation policies can be defined to respond to such an event. oblig NurseLeavePolicy on NurseOutEvt do nurseMOI.disablePolicies; home.remove(nurseMOI); E-Science

  19. Other Services • A Trust Framework for handling autonomously decisions when unknown entities are involved • A monitoring and auditing service for responsiveness, reliability, and performance E-Science

  20. Conclusion and Future Work Policy-based framework that provides the appropriate abstraction for dynamic environment. Policies can be used for managing access rights, dynamically adapt the system and assist entities in their duties. For the future, we envisage the use of workflow systems for handling more complex situations. Moreover, we are working on extending our policy language for capturing the notion of trust. E-Science

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