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NB-IOT
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PRE
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DOI：10.1016/B978-0-12-812458-1.00007-1.png)
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摘要
En 中文
This chapter presents the design of Narrowband Internet of Things (NB-IoT). The first part of this chapter describes the background behind the introduction of NB-IoT in the Third Generation Partnership Project (3GPP) specifications and the design principles of the technology. That is, what motivated 3GPP to embark on the standardization of yet a third cellular IoT technology, despite the ongoing activities of specifying both Extended Coverage Global System for Mobile Communications Internet of Things (EC-GSM-IoT) and Long-Term Evolution for Machine-Type Communications (LTE-M)? The second part of this chapter focuses on the physical channels with an emphasis on how these channels are designed to fulfill the objectives that NB-IoT is intended to achieve, namely, deployment flexibility, ubiquitous coverage, ultra-low device cost, long battery lifetime, and capacity sufficient for supporting a massive number of devices in a cell. Detailed descriptions are provided regarding both downlink and uplink transmission schemes and how each of the NB-IoT physical channels is mapped to radio resources in both the frequency and time dimensions. The third part of this chapter covers NB-IoT idle and connected mode procedures and the transition between these modes, including all activities from initial cell selection to completing a data transfer. The idle mode procedures include the initial cell selection, which is the procedure that a device has to go through when it is first switched on or is attempting to select a new cell to camp on. Idle mode activities also include paging and acquisition of Master and System Information Blocks. After the idle mode procedures, the transition from idle to connected mode is described in a set of system access procedures. Then, descriptions of some fundamental connected mode procedures including scheduling, power control, and multicarrier operation are presented. Finally, a summary of the most recent improvements accomplished in Release 14 of the 3GPP specifications is presented.
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