LTE-M (LTE for Machines (Cat-M1))

Also known as: Cat-M1, LTE Cat-M, LTE for Machines

LTE-M is a 3GPP LPWA variant of LTE (UE category M1 in Release 13, M2 in Release 14) that supports up to ~1 Mbit/s, VoLTE, mobility, and power-saving features (PSM, eDRX) suitable for battery-powered IoT devices with more capability than NB-IoT. It reuses LTE/EPC and 5GC security and NAS, and is widely deployed for asset tracking, wearables and connected metering.

Categories: Protocols and StandardsIoT

LTE-M in context

Telecom security is written into standards from 3GPP, GSMA, ETSI, IETF and ITU-T. Understanding which body owns which specification, and how the specs interlock (for example 3GPP TS 33.501 with GSMA FS.34 for 5G SBA security), is essential for both design and audit work.

Cellular IoT (NB-IoT, LTE-M and 5G mMTC) brings billions of devices with weak identities, long field lifetimes and limited patchability into operator networks. The same signaling attacks that target smartphones (location tracking, denial of service, credential exfiltration) apply, often at greater scale.

To place LTE-M in the wider telecom-security picture, review mMTC, NB-IoT, CSFB, 5G, LTE-Advanced (LTE-A) and Zigbee.

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