CHAPTER 1

Introduction and Scope

Release 13 LTE-M was specified during the 3GPP eMTC work item [1] which was completed in March 2016 and defined one new user equipment (UE) category – “Category-M1”.

Although coverage analyses were conducted during this work, 3GPP has not assessed to what extent the maximum achievable coverage exceeds the target that the normative specification provides. This white paper includes the results from such a coverage analysis. The analysis was supported through link level simulations (LLS) conducted by several of the supporting companies. The coverage performance is reported both in terms of Signal-to-Noise Ratio (SNR) and Maximum Coupling Loss (MCL).

Z

Fact

3GPP has not assessed to what extent the maximum achievable coverage exceeds the 3GPP target.

Z

Fact

Given that extended coverage is defined as a feature within the standards, this means any category UE can support the extended coverage feature.

Even though this analysis only considers the CAT-M1 UE, given that Coverage Enhancement Mode A and B are defined as features within the standards, any category UE can support the extended coverage feature. The uplink coverage performance is similar to CAT-M1 but given that most other LTE category UEs have two receive antennas (where CAT-M1 only has one), the downlink performance is 3-4 dB better than shown in this paper.

Before going into the LLS simulation results, the paper presents the foundation and assumptions used to calculate the MCL. Also to provide some technical background, several coverage techniques used in the LTE-M specification are described.

Abbreviations

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Maximum Coupling Loss (MCL)

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Maximum Coupling Loss (MCL)