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4 Unleashing the potential of the Internet of Things

7.3 Transitional configurations for SCN applications

Nowadays most mass mobile user terminals, such as mobile phones, PDAs and netbooks, have no
technical possibility of direct data exchange with existing infrastructures of motes because of
differences in transceiver types and transmission standards. Therefore, transitional configurations
are needed to provide a possibility of using SCNs with mass mobile user terminals.

7.3.1 Centralized configuration for SCN applications
7.3.1.1 Introduction to centralized configuration for SCN applications

This configuration is so called because the data for every decision made by SCN are transferred
through the SCN controllers and are delivered to the actuators via a central communication channel.
It should be employed when actuators can only communicate via the central communication
channel and/or it is not desirable to change the existing infrastructure of motes and actuators to
enable SCN applications.
7.3.1.2 Role distribution in a centralized configuration for SCN applications

• SCN controller:
– It receives from the actuators requests via the central communication channel about
aggregate values.
– It requests transmission of sensed data and reference values from the appropriate motes via
the SCN infrastructure 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 (e.g., a different application server) and the
authorized personnel administrating the SCN.
• Actuator:
– It requests from the SCN controllers via the central communication channel aggregate
values, which are necessary for making a decision.
– It receives from the SCN controllers via the central communication channel the requested
aggregate values.
– It forms the appropriate control commands.
– It transmits information about its own status to the SCN controllers via the central
communication channel.

• Mote:
– It receives requests from the SCN controllers via the SCN infrastructure about sensed data
or reference values.
– It transmits to the SCN controllers the requested data via the SCN infrastructure.
7.3.1.3 Decision-making process

The decision-making process follows the following procedure:
1) The necessary sensed data, reference values and aggregate values are kept in the SCN
controllers' memory and regularly updated.
2) Each actuator needs to have the up-to-date aggregate values necessary to make a decision.
These aggregate values are fetched from the SCN controllers.

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