a storage resource may be permanently stored there or have an expiry date
after which the information is to be removed. For this purpose a storage
resource may have to implement mechanisms that remove such information on
a regular basis. It is also possible to adapt the granularity of information that is
stored over time, i.e., for a certain time interval all the information is stored, for a
further time interval only a fraction of the information is kept whereas the rest is
discarded. Such a scheme may allow the definition of multiple such time
intervals and also requires specific underlying mechanisms that can implement
the scheme.
To avoid keeping Service Descriptions of services that no longer exist, a time-
out mechanism needs to be implemented by the IoT Service Resolution. After
the time-out has been reached without a renewal of the Service Description, the
Service Description should automatically be removed. This in turn requires that
the components originally providing the Service Description renew the
registration of the Service Description before the time-out is reached. The same
applies for associations stored by the VE Resolution.
4.2.4 Deployment & operation view
Connected and smart objects in the IoT can be realized in many different ways
and can communicate using many different technologies. Moreover, different
systems may need to communicate the one to each other in a compliant way.
Hence the Deployment and Operation view is very important to address how
actual system can be realized by selecting technologies and making them
communicate and operate in a comprehensive way.
The Deployment and Operation View aims at providing users of the IoT
Reference Model with a set of guidelines to drive them through the different
design choices that they have to face while designing the actual implementation
of their services. To this extent this view will discuss how to move from the
service description and the identification of the different functional elements to
the selection among the many available technologies in the IoT to build up the
overall networking behaviour for the deployment.