3GPP	3rd Generation Partnership Project
ASCI	Advanced Speech Call Items
BS	Base Station
BSC	Base Station Controller
CA	Carrier Aggregation
CBTC	Communications Based Train Control
CCBG	Critical Communication Broadband Group
CCTV	Closed-Circuit Television
CoMP	Coordinated Multi-point
DL	Downlink
DSS	Decision Support System
EGPRS	Enhanced General Packet Radio Service
EIRENE	European Integrated Railway Radio Enhanced NEtwork
eLDA	enhanced Location Dependent Addressing
eMBMS	Evolved Multimedia Broadcast Multicast Service
eMLPP	enhanced Multi-Level Precedence and Pre-emption
EMU	Electric Multiple Unit
eREC	enhanced Railway Emergency Call
ERA	European Railway Agency
ERTMS	European Rail Traffic Management System
ETCS	European Train Control System
ETSI	European Telecommunications Standards Institute
FA	Functional Addressing
FRS	Functional Requirements Specification
GCR	Group Call Register
GNSS	Global Navigation Satellite Systems
GSMA	GSM Association
GSM-R	Global System for Mobile Communications-Railways
HMI	Human-Machine Interface
IMS	IP Multimedia Subsystem
IMT-Advanced	International Mobile Telecommunications - Advanced
IoT	Internet of Things
QoE	Quality of Experience
QoS	Quality of Service
LAS	Link Assurance Signal
LDA	Location Dependant Addressing
LTE-A	LTE-Advanced
M2M	Machine-to-Machine
MAC	Medium Access Control
MBMS	Multimedia Broadcast Multicast Service
MBSFN	Multicast and Broadcast over Single Frequency Networks
MCPTT	Mission Critical Push To Talk over LTE
MRO	Maintenance, Repair and Operation
MS	Mobile Station
OFDM	Orthogonal Frequency Division Multiplexing
PoC	Push-to-Talk over Cellular
ProSe	Proximity Services
RAMS	Reliability, Availability, Maintainability and Safety
SIL	Safety Integrity Level
TCC	Train Control Center
TEDS	TETRA Enhanced Data Service
TETRA	Trans European Trunked RAdio
UIC	Union Internationale des Chemins de Fer
UL	Uplink
VBS	Voice Broadcast Service
VGCS	Voice Group Call Service
VoLTE	Voice over LTE
WiMAX	Worldwide Interoperability for Microwave Access
WLAN	Wireless Local Area Network
WSN	Wireless Sensor Networks