Abstract
This chapter deals with the Internet of things (IoT) over non-geostationary orbit (NGSO) system design as depicted in Figure 12.1 and random access (RA) aspects. A large number of selected references are provided for the reader interested to have a more in-depth understanding of the aspects touched in the text. The chapter is organized as follows: Section 12.1 reviews IoT over NGSO system aspects. In particular, it deals with IoT frequency bands, satellite orbit effects (Doppler, propagation aspects), land mobile satellite (LMS) channel, Doppler, and path loss (PL) compensation techniques; Section 12.2 discusses the rationale and the challenges for RA in NGSO networks. In particular, it deals with IoT traffic models, RA versus demand assignment multiple access (DAMA), slotted versus unslotted RA solutions, RA schemes trade-off, and signal processing aspects; Section 12.3 deals with NGSO RA schemes design aspects. In particular, it covers the design of the forward and return link, the RA key performance indicators, and how to perform detailed and simplified RA analysis; Section 12.4 is covering NGSO RA standard and proprietary solutions and provides examples of system implementations. It covers RA solutions like S-band mobile interactive multimedia (S-MIM), very high frequency (VHF) data exchange (VDE), narrowband IoT (NB-IoT), and universal network for IoT (UNIT). This section also highlights in-orbit demonstrations of emerging satellite IoT systems and associated opportunities and challenges ahead.
Published Version
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