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IEEE/ICACT20230155 Slide.03        [Big Slide]	Oral Presentation
	Over the last three decades, wireless terrestrial networks (TNs) have spread across the globe. However, some remote areas, such as mountains and oceans, remain difficult to cover by TNs. Therefore, non-terrestrial networks (NTNs) are a promising alternative to TNs for global coverage extension and are expected to play a key role in the beyond-5G or 6G era. In this study, we investigated the expected shift from the current narrowband Internet of Things (NB-IoT) over TNs to the emerging NB-IoT over NTNs. We also investigated some key technological issues from a physical layer perspective.

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