Management Challenges of Context Management Challenges of Context- - PDF document

DSOM 2003 DSOM 2003 Management Challenges of Context Management Challenges of Context- - Aware Services in Ubiquitous Aware Services in Ubiquitous Environments Environments Heinz-Gerd Hegering, Axel Küpper Claudia Linnhoff-Popien, Helmut Reiser hegering@lrz.de {kuepper|linnhoff|reiser}@informatik.uni-muenchen.de Context Aware Service Context Aware Service � Context -Aware Services in Ubiquitous Environments Aware Services in Ubiquitous Environments -Aware Services in Ubiquitous Environments Aware Services in Ubiquitous Environments � Information characterizing the situation of an � Entity (person, place or object) � Context Aware Service (CAS) � Adaptation of process behavior or content � Caused by current context of entities � Contextualization � Process of adaptation of a certain service Management Challenges of Context- Management Challenges of Context Management of Context- Management of Context � Agenda � CAS Application Example � Deriving new management challenges � Context Information Model � At the moment: more � Federative Organization Model questions than answers � Mgmt. Funct. Areas (FCAPS) Helmut Reiser Helmut Reiser 2 1 1

Management of Context Management of Context- -Aware Services in Ubiquitous Environments Aware Services in Ubiquitous Environments Management of Context Management of Context- -Aware Services in Ubiquitous Environments Aware Services in Ubiquitous Environments Management Challenges of Context- Management Challenges of Context -Aware Services in Ubiquitous Environments Aware Services in Ubiquitous Environments Management Challenges of Context Management Challenges of Context- -Aware Services in Ubiquitous Environments Aware Services in Ubiquitous Environments � Higher level of mobility (infrastructural parts are mobile) � Lot of different actors � Context as a result of � Context may have spatial or temporal validity � Highly distributed in ubiquitous environment � Heterogeneous formats and accuracy � Wide variety of heterogeneous context sources procurement process � user specific � complex Application Example of CAS Application Example of CAS Characterization of CAS Characterization of CAS Helmut Reiser Helmut Reiser Helmut Reiser Helmut Reiser 4 3 2 2

Management of Context- Management of Context -Aware Services in Ubiquitous Environments Aware Services in Ubiquitous Environments Management of Context Management of Context- -Aware Services in Ubiquitous Environments Aware Services in Ubiquitous Environments Management Challenges of Context- Management Challenges of Context -Aware Services in Ubiquitous Environments Aware Services in Ubiquitous Environments Management Challenges of Context Management Challenges of Context- -Aware Services in Ubiquitous Environments Aware Services in Ubiquitous Environments Selecting „best“ context source ? � Different (QoC) with formal Quality of Context Context Definition Language (CDL) Value Chain � independent actors � accuracy � formats � information sources Value Chain Characteristics Value Chain Characteristics Context Value Chain Context Value Chain Helmut Reiser Helmut Reiser Helmut Reiser Helmut Reiser Value Chain Automation ? � Not a single trace but several as MOs Sub-processes of the Value Chain sequences � dynamic changing � event triggered � in parallel � in predescribed order 6 5 3 3

Role Model for CAS Role Model for CAS � Mapping of Value Chain -Aware Services in Ubiquitous Environments Aware Services in Ubiquitous Environments processes to role model ? -Aware Services in Ubiquitous Environments Aware Services in Ubiquitous Environments � Context Provider: Sensing � CAS Provider: Contextualization Orchestration of value chain creation � Problems for Management � Independent actors = Management Challenges of Context- Management Challenges of Context self management cells Management of Context- Management of Context � No „leader of the band“ � No direct influence on foreign business or decision processes � Federative organization model � Automated interorganizational cooperation Helmut Reiser Helmut Reiser 7 Configuration Management Challenges Configuration Management Challenges � Orchestration of context value chain -Aware Services in Ubiquitous Environments Aware Services in Ubiquitous Environments -Aware Services in Ubiquitous Environments Aware Services in Ubiquitous Environments � Depends on the context information itself � Based on dynamic criteria (e.g. mobility of users) � Automatic adaptation to constantly changing infrastructure � CAS provider needs integrated and automated configuration mechanisms across � heterogeneous systems � independent context providers � Classical service lifecycle not feasible for ad-hoc creation Management Challenges of Context- Management Challenges of Context of user individual CAS Management of Context- Management of Context � Hierarchy of lifecycles: Lifecycle for CAS infrastructure � Micro-lifecycle for each individualized service instance � CAS must be easy to use and configure for customers Helmut Reiser Helmut Reiser 8 4 4

Fault Management Challenges Fault Management Challenges � Technical deficiencies in sensor networks -Aware Services in Ubiquitous Environments Aware Services in Ubiquitous Environments -Aware Services in Ubiquitous Environments Aware Services in Ubiquitous Environments � Limited power, CPU, memory, radio energy, .... � No mgmt. or alarming function � Highly proprietary sensors � Capturing data from sensors unreliable (e.g. GPS indoor) � Even fault mgmt. for sensor networks not trivial � Deficiencies and „real“ faults in sensing � Faults in procurement of context Management Challenges of Context- Management Challenges of Context Management of Context- Management of Context � Fault Management must � Detect (temporary) absence of sensors � Support configuration management � Cover whole value chain and activate micro-lifecycle � Goal: Building an alternative value chain with same QoC Helmut Reiser Helmut Reiser 9 Accounting Management Challenges Accounting Management Challenges � Each user gets its own and (maybe) unique service -Aware Services in Ubiquitous Environments Aware Services in Ubiquitous Environments -Aware Services in Ubiquitous Environments Aware Services in Ubiquitous Environments � Customers point of view: � Predictability and keep control on costs � Price ceilings for certain CAS � Customer & provider: conservation of evidence for usage � Ad-hoc service agreements � Ad-hoc pricing Management Challenges of Context- Management Challenges of Context � Not the service defines the price, but the price causes the Management of Context- Management of Context type of service � Price-driven service adaptation; building the value chain � Price-driven service provisioning � Service roaming between CAS providers ? Helmut Reiser Helmut Reiser 10 5 5

Security Management Challenges Security Management Challenges � Classical CIA approaches do not fully fit -Aware Services in Ubiquitous Environments Aware Services in Ubiquitous Environments -Aware Services in Ubiquitous Environments Aware Services in Ubiquitous Environments � C onfidentiality: � Not all information sources known beforehand � Data transmission uncontrollable by the context owner � I ntegrity and A vailability: � Sensors are not designed for high availability � Easy to disturb � Context is sensitive data; danger of user profiling Management Challenges of Context- Management Challenges of Context � Privacy: context owner authorizes and prohibits access to Management of Context- Management of Context her data; (informational self-determination) � Delegation of privacy mgmt. to CAS/security provider � Automatically process able trust model � Integrated and interorganizational security mechanisms Helmut Reiser Helmut Reiser 11 Conclusion and Future Work Conclusion and Future Work � Context aware service provisioning: -Aware Services in Ubiquitous Environments Aware Services in Ubiquitous Environments -Aware Services in Ubiquitous Environments Aware Services in Ubiquitous Environments � Short (real-) time and user individual service adaptation � Different organizational domains � Context information determines service provisioning � Deriving new management challenges in a structured way � At the moment more questions than answers � Roadmap for further research in this area Management Challenges of Context- Management Challenges of Context � Future work: Management of Context- Management of Context � Identification of functional building blocks for CAS mgmt. functions � Investigation and concepts for interorganizational aspects � Specification of a CDL � Identification of universal QoC parameters Helmut Reiser Helmut Reiser 12 6 6