LTE-M

LTE for Machine Type Communications

Services

Introduced in Rel-13

LTE variant for IoT with higher data rates and mobility support compared to NB-IoT.

Description

LTE-M (also known as eMTC - enhanced Machine Type Communications or Cat-M1) is an LPWAN technology based on LTE, designed for IoT applications requiring higher throughput and mobility compared to NB-IoT.

LTE-M uses 1.08 MHz bandwidth and supports peak rates up to 1 Mbps. It maintains full mobility and supports VoLTE for voice applications, making it suitable for wearables and asset tracking.

Purpose & Motivation

LTE-M was introduced to:

- Support IoT devices requiring higher data rates than NB-IoT - Enable mobile IoT applications (vehicle tracking, wearables) - Provide voice capability for IoT devices - Offer simpler upgrade path from existing LTE networks

Key Features

  • 1.08 MHz bandwidth
  • Up to 1 Mbps data rate
  • Full mobility support
  • VoLTE capability
  • PSM and eDRX
  • 15 dB coverage enhancement

Evolution Across Releases

Rel-13Initial

Initial Cat-M1 with 1 MHz bandwidth, HD-FDD

Cat-M2 with higher throughput, VoLTE support, positioning

Wake-up signal, reduced latency

Defining Specifications

SpecificationTitle
Physical Channels and Modulation
UE Radio Access Capabilities
RRC Protocol Specification