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Unleashing the potential of the Internet of Things 5

8 WoT service functions

8.1 Functional entities of the WoT service support functions (WoT-S SF)

The WoT-S SF manages overall behaviours of the WoT service. The WoT-S SF are responsible for
providing service profile management, service discovery, service monitoring, QoS management,
access control and policy management of a WoT service. The WoT-S SF consists of four functional
entities (FEs); the WoT service profile management FE (WoT-S-PRM FE), the WoT service
discovery FE (WoT-S-DIS FE), the WoT service policy management FE (WoT-S-PM FE) and the
WoT service monitoring FE (WoT-S MON FE). The WoT-S SF also interworks with the WoT-S
repository to register and discover WoT services, etc.

Figure 3 – Functional entities and interfaces of WoT-S SF

8.1.1 WoT service profile management functional entity (WoT-S-PRM FE)

The WoT-S profile management FE (WoT-S-PRM FE) is responsible for managing the profile of
the registered services. The service profile is a record that contains information related to the WoT
service such as version of service, service life cycle, service classification etc. If a service version is
changed, this information is reflected in the registered WoT-S repository. The WoT-S-PRM FE
interworks with the WoT-S repository to maintain the latest information of the WoT service.

A WoT user requests a service through the WoT-S-PRM FE and the WoT-S-PRM FE forwards the
request to the WoT-S-DIS FE. The WoT-S-DIS FE analyses the request and searches the services in
the WoT-S repository or on the web. The WoT-S-DIS FE returns the result to the WoT-S-PRM FE.
And the WoT-S-PRM FE provides the service to the WoT user.

8.1.2 WoT service discovery functional entity (WoT-S-DIS FE)
The WoT service discovery FE (WoT-S-DIS FE) provides a discovery capability in collaboration
with web resource functions. The WoT-S-DIS FE interworks with the WoT broker functions to
discover the WoT service composed of physical devices.
In the WoT service environments, lots of the WoT services will be presented and provided on the
web and many users and service developers want to search and find them on the web. In the context
of the WoT, the simplest way of enabling search for the WoT service (things) is using the web
search engines like the web documents. However, a search for things as the WoT service is more
complicated than a search for documents on the web due to its contextual information such as their
absolute location or their relative location.

Rec. ITU-T Y.4414/H.623 (11/2015) 797