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LTE-M
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DOI：10.1016/B978-0-12-812458-1.00005-8.png)
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Abstract
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In this chapter, we describe the Long-Term Evolution for Machine-Type Communications (LTE-M) physical layer design with an emphasis on how the physical channels are designed to fulfill the objectives that LTE-M targets, namely low device cost, deep coverage, and long battery lifetime while maintaining capacity for a large number of devices per cell, with performance and functionality suitable for both low-end and mid-range applications for the Internet of Things (IoT). Section 5.1 describes the background behind the introduction of LTE-M in the Third Generation Partnership Project (3GPP) specifications and the design principles of the technology. Section 5.2 focuses on the physical channels with an emphasis on how these channels are designed to fulfill the objectives that LTE-M is intended to achieve, namely low device cost, deep coverage, and long battery lifetime, while maintaining capacity for a large number of devices per cell, with performance and functionality suitable for both low-end and mid-range applications for the IoT. Section 5.3 covers LTE-M procedures in idle and connected mode, 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 acquisition of system information, paging, and random access. Descriptions of some fundamental connected mode procedures include scheduling, power control, and mobility. Finally, a summary of the most recent improvements accomplished in Release 14 of the 3GPP specifications are presented in Section 5.4.
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