Page 327 - 2015 Security in Telecommunications and Information Technology

Unleashing the potential of the Internet of Things 3

5) As a user may use several EHM devices at the same time, it is recommended to support
unified service charging per user, not per end point.

9.3.2 Message conversion
According to service requirement 8.5(2), the SSAS layer is required to provide message conversion
for EHM applications and EHM devices. Structured information sharing among EHM applications
is realized via messages which are composed of predefined syntax and semantics. The messages
transmitted between EHM applications and EHM devices are often not uniform. EHM applications
and EHM devices may use messages with different syntax or semantics, which are possibly not
compatible with each other. So the SSAS layer is required to provide message conversion for EHM
applications and EHM devices.

9.3.3 Data storage

According to service requirement 8.5(3), the SSAS layer is required to provide data storage for
EHM applications and EHM devices.

NOTE – The exponential growth in electronically stored EHM data and the simultaneous storage of huge
amounts of data are putting pressure on this capability. Large data centres are of increased relevance for
support of this capability.
The data storage capability requirements include the following:
1) Standard format

The data stored in the SSAS layer are recommended to be stored in standard format so that
the information can be easily exchanged among different EHM applications.
2) Object orientation

The data storage in the SSAS layer is recommended to adopt the object-oriented access
technique for layer separation and independence, so that the information of each EHM
customer and each EHM device can be modelled as objects and mapped into the storage
area.
3) Time stamping
The EHM application data stored in the SSAS layer are required to be marked with
collection time, since health conditions can vary over time. Using time stamping, the EHM
applications can obtain useful information according to the health history.

9.3.4 Time synchronization
According to service requirement 8.2.3(4), the time synchronization capability is required to be
supported in the SSAS layer, which includes:
1) Time retrieval
The SSAS layer is required to retrieve time parameters from authoritative time servers or
via other ways according to the application requirements.
2) Time announcement
The SSAS layer is required to publish the time parameters according to the application
requests of EHM applications and devices. It is recommended that the SSAS layer
publishes time parameters periodically for the time calibration of EHM devices and
applications.
9.3.5 Location provisioning

According to service requirements 8.2.1(5), 8.2.2(5), 8.2.3(5), 8.6.2(5), the location provisioning
capability is required to be supported in the SSAS layer to provide to EHM applications the position
of EHM customers, according to regulations and laws.

Rec. ITU-T Y.4110/Y.2065 (03/2014) 313