Page 812 - Unleashing the potenti al of the Internet of Things

5 Unleashing the potential of the Internet of Things

8.1.3 WoT service monitoring functional entity (WoT-S-MON FE)

The WoT service monitoring FE (WoT-S-MON FE) is responsible for monitoring the registered
WoT service. The web client or other FEs (WoT-S-DIS FE, WoT-S-PRM FE) utilize the
WoT-S-MON FE to find out the status of the WoT service. The status of the WoT service is
recommended to include service availability or predict response time, static/dynamic status
information and resource information, e.g., CPU/GPU power.

The WoT-S-MON FE is recommended to provide static and dynamic information in order to
guarantee a stable quality of the WoT service. Static information consists of quality requirements,
e.g., response time, min performance value, max performance value and normal performance value
for the WoT service. Dynamic information consists of a real-time updated status for the WoT
system and service. For example, system status includes application ID, network port, the amount of
instant data and average data, network bandwidth, and so on. Service status includes execution time,
fps, screen size, and so on.

The WoT-S-MON FE is required to monitor system resource information of processor power
consumption, e.g., CPU and GPU, in order to predict system power consumption of the WoT
service. Therefore, the system resource is necessary to provide the QoS guaranteed WoT service
such as a high performance with lower power consumption. A GPU resource is measured by using a
power coefficient corresponding to each GPU frequency, GPU utilization and GPU static power.

8.1.4 WoT service policy management functional entity (WoT-S-PM FE)

The WoT service policy management FE (WoT-S-PM FE) provides three capabilities for the WoT
service as follows:

– QoS information management: The WoT-S-PM FE is responsible for managing QoS
information about the registered WoT service. It checks accessibility, performance,
reliability of the WoT service. The WoT-S-PM FE is also responsible for providing QoS
information to the web client.
– Service access control: The WoT-S-PM FE provides service access control capabilities to
control the accessibility of a specific service by an application. It provides authentication
and authorization actions required to ensure that the web client has appropriate access rights
to the requested service.
– Security and safety management: The WoT-S-PM FE provides control capabilities
regarding security and safety in order to support a trustworthy WoT service. It provides
methods to guarantee the safe execution of service in the WoT system, which are comprised
of actions by detecting an execution request and controlling execution of the service
command.

8.2 Functional entities of the WoT service control functions (WoT-S CF)

The WoT-S CF is responsible for controlling the WoT service creation, service execution, service
registration and service management. The WoT-S-CF consists of four functional entities (FEs); the
WoT-S management FE (WoT-S-MA FE), the WoT service execution FE (WoT-S-EX FE), the
WoT-S creation FE (WoT-S-CR FE), the WoT service registration FE (WoT-S-RE FE) with
WoT-S repository.

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