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LTE Reference

LTE Protocols

The LTE protocol stack defines how data and signaling are transmitted across the radio interface and core network in 4G systems.

This page provides a structured reference for key LTE protocols, including PHY, MAC, RLC, PDCP, RRC, and NAS, with explanations aligned to 3GPP specifications and real network behavior.

The content is organized layer by layer, helping you understand how physical transmission, data transport, and signaling procedures operate together in LTE networks.

NASRRC

Released Protocols

Layer: Core signaling Open

NAS

EMM and ESM procedures, states, causes, and session control references.
Layer: Access stratum Open

RRC

Radio resource control procedures, states, system information, and timers.

Recently Added Protocol Pages

LTE NAS EMM and ECM States: EMM-REGISTERED, ECM-IDLE, and ECM-CONNECTED

LTE NAS EMM and ECM states reference based on 3GPP TS 24.301 and TS 23.401. Understand EMM-NULL, EMM-DEREGISTERED, EMM-REGISTERED, ECM-IDLE, ECM-CONNECTED, and how LTE mobility and connection states work together.

 LTE System Information - MIB, SIB1, and the SIB Set

Reference page for LTE system information in RRC, covering MIB, SIB1, other SIBs, scheduling, paging context, idle-mode behavior, measurements, and Release 18 standards context.