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NB-IoT
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DOI：10.1016/B978-0-08-102902-2.00007-8.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. The second part of this chapter focuses on the physical channels with an emphasis on how these channelswere designed to fulfill the objectives that NB-IoT was 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 ina cell. Detaileddescriptions are provided regarding bothdownlink and uplink transmission schemes and howeach of theNB-IoT physical channels ismapped 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. NB-IoT since its first introduction has been further enhanced both in terms of performance and features. This chapter highlights the improvements accomplished in Release 14 and Release 15 of the 3GPP specifications. As NB-IoT devices are expected to have long life cycles, how a network operator migrates from Long-Term Evolution (LTE) to Fifth Generation (5G) New Radio (NR) while continuing to honor its contracts toward NB-IoT service providers becomes an important aspect. At the end of this chapter, we describe NB-IoT and NR coexistence.
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