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Problem and solution for NB-IoT uplink in Low Earth Orbit satellite communication

Among the 3rd Generation Partnership Project (3GPP) 5G use cases, Non-Terrestrial Network (NTN) are being considered as the direction of the technology evolution of massive Machine Type Communications (mMTC). As technology advances and the cost of launching satellites decreases, interest in low earth orbit (LEO) satellites is increasing. LEO satellites have two problems. The first is the problem of Doppler shift due to high velocity. Second, there is a decrease in throughput due to long round trip time (RTT). This paper proposes a solution for LEO satellite and NB-IoT to communicate.