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LTE-M CE Mode A Vs CE Mode B | Difference between LTE-M CE Mode A and CE Mode B

This page compares LTE-M CE Mode A and CE Mode B and describes difference between LTE-M CE Mode A and CE Mode B.

LTE-M follows 3GPP specifications similar to LTE technology. LTE-M stands for Long Term Evolution for Machine-Type Communications. It is mainly developed to fulfill cellular IoT device objectives such as low device cost, deep coverage, longer battery life, higher cell capacity and so on.


➤This mode provides sufficient CE (Coverage Enhancement) to compensate for all the simplifications which can be implemented by low cost LTE-M devices. It offers additional CE beyond normal LTE coverage.
➤The mode is optimized for moderate CE achieved through small amount of repetition. It supports upto 32 subframe repetitions of the data channel.
➤Release 12 supports 1.4 MHz in DL and UL, Release 13 supports 5 MHz (DL/UL), Release 14 supports 20 MHz (DL) and 5 MHz (UL)


➤This mode B goes one step further in order to provide deep coverage which may be needed in more challenging coverage conditions.
➤This mode is optimized for substantial CE achieved through large amount of repetition. It supports upto 2048 repetitions.
➤As per evaluations it offers coverage target of about 20 dB.
➤The device supporting CE Mode-B also supports CE Mode-A.
➤Release 12 supports 1.4 MHz in DL and UL, Release 13 supports 5 MHz (DL) and 1.4 MHz (UL), Release 14 supports 20 MHz (DL) and 1.4 MHz (UL)

LTE-M devices operate in one of these CE modes. The CE modes offer efficient operation of low cost LTE-M devices such as resource allocation is based on narrowband etc.

NB-IoT Related Stuff


This tutorial section on LTE basics covers following sub topics:
LTE tutorial  LTE features  LTE terminologies  Frame  TDD FDD  Channel types  PHY  stack  throughput  CA   cell search  network entry  Timers  PSS vs SSS  Security   LTE Bands  EARFCN  Hotspot  router  What is VoLTE  VoLTE originating call flow  VoLTE UE attach and registration procedure 

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