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Unleashing the potential of the Internet of Things 5

– It is required to provide functions to store, query, modify and delete data in RDF form in
the repository.
– It is required to provide functions to search USN resources and sensed data/semantic data
by analysing the intention of service requests from an application.
– It is required to support a standard query language such as SPARQL Protocol and RDF
Query Language (SPARQL) [b-SPARQL].
– It is recommended to manage access for USN resources and sensed data/semantic data
according to proper access rights.

8 Functional architecture of the open USN service framework

8.1 Functional architecture
Figure 8-1 shows the functional architecture of the open USN service framework.

Application

Open USN service platform

Application support FE

Semantic query FE

Semantic USN
LOD linking repository FE
FE
Semantic data Resource
LOD repository management
FE
Semantic
inference FE Sensed data
repository

Adaptation FE

Adaptation FE 1 Adaptation FE 2 ... Adaptation FE n

...
USN middleware 1 USN middleware 2 USN middleware n

Sensor or sensor
network

Figure 8-1 – Functional architecture of the open USN service framework

Rec. ITU-T Y.4402/F.747.4 (12/2013) 519