enabling distributed context entity discovery for an internet-of-things platform
TRANSCRIPT
Hasibur Rahman, PhLic
Enabling Distributed Context Entity Discovery for an Internet-of-Things Platform
SAI Intelligent Systems Conference 201510-11 November 2015 | London UK
Introduction• Everyday Things get connected
• Connected Things > human. Today, the ratio is 1.5:1
• Hundreds of billions by 2020
• Not limited to the scale of Connected Things only but also expands in its scope
• Leads to Internet of Everything (IoE)
Background• The challenges surrounding IoT have so far focused on creating architectures,
protocols
• In view of this, earlier researches have created MediaSense architecture which was implemented by extending the Distributed Context eXchange Protocol (DCXP)
• MesiaSense allows to create context-aware applications with IoT and real-time sharing of Context Information (CI)
• DCXP provides primitive messages to enable real-time communication between entities to share CI
• DCXP registers each entity as Universal Context Identifier (UCI) and other entity resolves the UCI to fetch the corresponding CI
DCXP primitive messagesMessage Description
REGISTER_UCI This message is used to register a particular UCI that holds context information in an entity
RESOLVE_UCI This message needs to be invoked to fetch context information associated with the UCI
GET Once the UCI is resolved at an entity, this message is used to get the context information
SUBSCRIBEThis enables an entity to subscribe to a particular context information and entity only gets updated
when there is a new value
NOTIFY Notifies the entity subscribes to a particular context information with the latest information
CI sharing over MediaSense
What is the problem?
Conclusion
This mandates to look into new approach to enable context entity discovery
- Entities cannot be expected to have information - May work for small-scale network
Entity needs to know the UCI prior to resolving
SolutionA Publish/Subscribe based solution
Rendezvous node as initial publisher (a global UCI)
Each node by default subscribes to the global UCI
Two new primitive messages have been added to DCXP, i.e. joinUCI and DISCOVER
Solution contd. (2)
ResultsMessage Description
joinUCI
This new functions now combines the old REGISTER_UCI and GET primitive funcions,
and enables context entity to join and retrieve context information at the same
time
DISCOVERThis message needs to be invoked to
discover existing UCIs and to synchronize with newly joined entities
Time for joinUCI
REGISTER_UCI +
GET joinUCI
sec 0.07 0.09
Time for DISCOVER
UCIs
100 200
ms 293 450
Conclusions•Proposed algorithms that enable successful fast
discovery of context entity
• Introduced two new primitive functions namely joinUCI and DISCOVER
•Result of the extended DCXP is on par with the existing DCXP protocol
•Can be extended to any p2p-based platform
Future work•Enable cross-platform communication
•Enable autonomic management
•Naming scheme for DCXP
Credits
EU for its funding for the FP7 MobiS project
Immersive Networking Research group
