In the distribution of cellular IoT connections, medium-rate IoT services that account for about 30% of the total services require that Cat.1 or eMTC networks provide services. In the 3GPP Rel.13 standards frozen in 2016, two new specifications, Cat.M1 (eMTC) and Cat.NB (NB-IoT), were proposed to implement lower power consumption, lower cost, and wider coverage for LTE to meet communications requirements of a large number of devices. In 2021, many tier-1 operators, such as AT&T, Deutsche Telekom, and Orange, have deployed eMTC networks in North America, Europe, Latin America, South America, and other regions to provide network support for IoT lhfhbgkqspbstg.
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