LTE-M

LTE-M (LTE-MTC [Machine Type Communication]), which includes eMTC (enhanced Machine Type Communication), is a type of low power wide area network (LPWAN) radio technology standard developed by 3GPP to enable a wide range of cellular devices and services (specifically, for machine-to-machine and Internet of Things applications).[1][2] The specification for eMTC (LTE Cat-M1) was frozen in 3GPP Release 13 (LTE Advanced Pro), in June 2016.[3] Other 3GPP IoT technologies include NB-IoT and EC-GSM-IoT.[4]

The advantage of LTE-M over NB-IoT is its comparatively higher data rate, mobility, and voice over the network, but it requires more bandwidth, is more costly, and cannot be put into guard band frequency band for now.[5]. In March 2019, the Global Mobile Suppliers Association reported that over 100 operators had deployed/launched either NB-IoT or LTE-M networks.[6]

3GPP Narrowband Cellular Standards

[7][8]		 LTE Cat 1 LTE-M NB-IoT EC-GSM-IoT
LC-LTE/MTCe eMTC
LTE Cat 0 LTE Cat M1 LTE Cat M2 non-BL LTE Cat NB1 LTE Cat NB2
3GPP Release Release 8 Release 12 Release 13 Release 14 Release 14 Release 13 Release 14 Release 13
Downlink Peak Rate 10 Mbit/s 1 Mbit/s 1 Mbit/s ~4 Mbit/s ~4 Mbit/s 26 kbit/s 127 kbit/s 474 kbit/s (EDGE)

2 Mbit/s (EGPRS2B)

Uplink Peak Rate 5 Mbit/s 1 Mbit/s 1 Mbit/s ~7 Mbit/s ~7 Mbit/s 66 kbit/s (multi-tone)

16.9 kbit/s (single-tone)

 159 kbit/s 474 kbit/s (EDGE)

2 Mbit/s (EGPRS2B)

Latency 50–100 ms not deployed 10–15 ms 1.6–10 s 700 ms – 2 s
Number of Antennas 2 1 1 1 1 1 1 1–2
Duplex Mode Full Duplex Full or Half Duplex Full or Half Duplex Full or Half Duplex Full or Half Duplex Half Duplex Half Duplex Half Duplex
Device Receive Bandwidth 1.4–20 MHz 1.4–20 MHz 1.4 MHz 5 MHz 5 MHz 180 kHz 180 kHz 200 kHz
Receiver Chains 2 (MIMO) 1 (SISO) 1 (SISO) 1 (SISO) 1 (SISO) 1 (SISO) 1 (SISO) 1–2
Device Transmit Power 23 dBm 23 dBm 20 / 23 dBm 20 / 23 dBm 20 / 23 dBm 20 / 23 dBm 14 / 20 / 23 dBm 23 / 33 dBm

Deployments

As of March 2019 the Global Mobile Suppliers Association had identified:[9]

  • 60 operators in 35 countries investing in LTE-M networks
  • 34 of those operators in 24 countries had deployed/launched their networks
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See also

References
  1. LTE-M – the new GSM
  2. eMTC (LTE Cat-M1)
  3. Standards for the IoT
  4. "Extended Coverage - GSM - Internet of Things (EC-GSM-IoT)". gsma.com. GSMA. May 11, 2016. p. 1. Retrieved October 17, 2016.
  5. DIFFERENCES BETWEEN NB-IOT AND LTE-M
  6. GSA: Global Narrowband IoT – LTE-M networks – March 2019 (retrieved 25 March 2019)
  7. "Preliminary specification". 3GPP.
  8. Luo, Chao (March 20, 2017). "3GGP TS45.001: GSM/EDGE Physical layer on the radio path" (ZIPped DOC). 3gpp.org. 14.1.0. 3GPP TSG RAN WG6. p. 58. Retrieved May 27, 2017.
  9. GSA: Global Narrowband IoT – LTE-M networks – March 2019 (retrieved 25 March 2019)
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