CHAPTER 3

Coverage Targets

This section provides background information on the 3GPP targets that were used in the development of the LTE-M specification.

3.1 MCL TARGETS USING CONSERVATIVE NOISE FIGURES AND 20 dBm UE

3GPP initially started considering LTE-M in Release 11, producing the TR 36.888 study item technical report [6]. This technical report documents performance targets and an analysis of some technical approaches for adapting LTE in order to make it suitable for MTC applications. From the Release 13 work item description (WID) [1], the 3GPP target was to provide 15 dB of coverage gain for LTE-M with UE power class of 23 dBm, relative to a baseline CAT-1 Release 10 UE. However, the same coverage enhancement should be available for the new 20 dBm Power Class 5 UE as well, meaning that the actual target for LTE-M was to provide at least 18 dB of additional coverage for the limiting physical channel. Table 3 (below) shows the MCL calculation and the required gain for LTE-M channels where the conservative NFs are from [6] and a 20 dBm Power Class UE is assumed. The baseline SNR values are from [6] which were based on CAT-1 but are adjusted by 4 dB loss due to the single receiver that was assumed for CAT-M1:

 

Quiz

Z

Key Finding

The LTE-M 3GPP coverage gain target was 18 dB.

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Maximum Coupling Loss (MCL)

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LTE-M Coverage Enhancement Mode A & B

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Maximum Coupling Loss (MCL)

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LTE-M Coverage Enhancement Mode A & B