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Unleashing the potential of the Internet of Things 4

3) Each actuator forms a control command depending on the aggregate values.

An example of a flow chart for centralized configuration is shown in Figure 7-4.

Motes SCN controllers Actuators

Decision
making

Aggregate
values

Reference
values

Sensed
data

Y.2222(13)_F7-4

Figure 7-4 – Example of flow chart for centralized configuration for SCN applications

7.3.2 Ad-hoc configuration for SCN applications
7.3.2.1 Introduction to ad-hoc configuration for SCN applications

This configuration is so called because it utilizes ad-hoc networks (e.g., based on Bluetooth or
Wi-Fi technologies) to deliver data to actuators. It should be employed when there is the possibility
to expand the existing SCN infrastructure and the actuators have some ad-hoc wireless network
capabilities. Some intermediate devices called gates are used to provide a communication channel
between actuators and one or several nearby motes.
7.3.2.2 Role distribution in ad-hoc configuration for SCN applications

• SCN controller:
– It receives from the actuators via the central communication channel requests about
aggregate values, which are necessary for making a decision but cannot be calculated by the
actuators themselves.
– It requests transmission of sensed data and reference values from the appropriate motes and
regularly calculates the necessary aggregate values.

– It transmits to each actuator via the central communication channel the aggregate values
requested by that actuator.

– It interoperates with external systems (for example, a different application server) and the
authorized personnel administrating the SCN.

• Gate:
– It receives requests from the actuators via the ad-hoc network about sensed data and
reference values and forwards them to the motes via the SCN infrastructure.
– It transmits the requested data to the actuators via the ad-hoc network.

Rec. ITU-T Y.4250/Y.2222 (04/2013) 387