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Unleashing the potential of the Internet of Things 5

(4) The Semantic query FE requests from the Resource management FE the URIs of USN
resources that can be used for performing queries that will provide the necessary
information to satisfy the Application request.

(5) The Resource management FE sends this request message to the Semantic USN repository
FE.
(6) The Resource management FE receives the URIs of corresponding USN resources from the
Semantic USN repository FE.
(7) The Resource management FE returns the URIs of corresponding USN resources to the
Semantic query FE.
(8) The Semantic query FE queries the Semantic USN repository FE for the sensed
data/semantic data related to the returned URIs.
(9) The Semantic query FE receives the sensed data/semantic data related to the returned URIs
in the Semantic USN repository FE.
(10) The Semantic query FE sends the sensed data/semantic data to the Application support FE.
(11) The Application support FE sends the sensed data/semantic data to the Application.

I.3 Sensed data access from USN resources

Figure I.3 shows the information flows describing how to access sensed data directly from USN
resources in real-time.

Application

Open USN service platform 1 10
Application support FE

2 9
Semantic query FE

3 6 7 8
Semantic USN
LOD linking repository FE
FE
Semantic data 4 Resource
repository
management
FE
Semantic 5
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 I.3 – Information flow of accessing sensed data from USN resources

Rec. ITU-T Y.4402/F.747.4 (12/2013) 525