  In the recent years, world has witnessed the ubiquitous applications of
Internet of things (IoT) for many different scenarios. There are several
critical applications where the results are essential and the mission has to be
successful at any cost. Such applications are well known as mission critical
applications. These applications are really critical and deal with very serious
situations such as disaster management, rescue operations and military
applications. IoT can provide both accuracy and sustainability in these
applications. IoT in fact, is suitable for several critical applications
because it can be deployed at locations where human presence is not possible
due to the dangers to human life. In such cases, collection of information can
be done through IoT sensors and it can be sent directly to the processing hubs.
These days we find several mission critical applications where both increased
reliability and coverage have very high priorities. Hybridization of IoT and
satellite networks can be a game changer in these applications. In this
article, we present the general features of mission critical IoT and the
motivation for connecting it with the satellite networks. Then we present the
main deployment related issues of these hybrid networks. We focused on the
hybridization aspects of narrowband IoT (NBIoT) with the satellite networks.
Because NBIoT has the energy efficiency which can make the satellite based IoT
networks sustainable in the long term.
