Page 555 - 2015 Security in Telecommunications and Information Technology

Unleashing the potential of the Internet of Things 5

6.3.2 Service stratum functions

The service stratum functions are required to be extended to support requirements of USN
applications and services. The extensions of the service stratum functions are given in the following
clauses.

6.3.2.1 Service control and content delivery functions
The following functional requirements are supported by existing service control and content
delivery functions [ITU-T Y.2012]:
• Identification, authentication and authorization requirement:
The service control functions (SCF) support authentication and authorization functions for
the USN end-users at the service level.

6.3.2.2 Application support functions and service support functions
There are no extended capabilities in the application support functions and service support functions
to support USN applications and services.

The following functional requirements are supported by existing application support functions and
service support functions [ITU-T Y.2012]:

• Identification, authentication and authorization requirement:
The application support functions and service support functions (ASF&SSF) provide
authentication and authorization to access the services at the application level.

• Profile management requirement for registration and discovery of service:
[ITU-T Y.2221] specifies that the service profile for service registration and discovery
requires the extension of NGN capabilities. However, [ITU-T Y.2012] defines that the
ASF&SSF, especially the application support functional entity (AS-FE), provides generic
application server functions such as service selection and service discovery.
• Security:

Application support functions and service support functions provide the protection of
content (sensor data).

6.3.3 Management functions
The management functions are required to be extended to support requirements of USN
applications and services. The extensions of the management functions are as follows:
• Sensor network management requirement:

IP-based and non-IP-based sensor networks using various types of wired and/or wireless
connection can coexist in USN applications and services. Non-IP-based sensor networks
are often managed through their gateway. IP-based sensor networks include the case of a
single sensor node directly connected to NGN, although sensor networks are often managed
as a set. The management functions are required to manage IP-based sensor networks as
well as non IP-sensor networks.

• Profile management (device profile) requirement:
In USN applications and services, a device profile consisting of the information of sensor
networks and/or sensor nodes should be provided and managed. As there are various types
of sensors, sensor nodes and sensor networks, device profiles would help to manage a large
number of heterogeneous nodes and networks. The information of device profiles may
include sensor network identifier, device identifier, device types, capabilities and location.
The management functions may support device profile management.

Rec. ITU-T Y.4403/Y.2026 (07/2012) 541