AAL	Ambient Assisted Living
AI	Artificial Intelligence
AoA	Angle of Arrival
AP	Access Point
BLE	Bluetooth Low Energy
CDF	Cumulative distribution Function
CIPS	Collaborative Indoor Positioning System
CSI	Channel State Information
CTP	Collection tree protocol
D2D	Device to Device
DR	Dead Reckoning
EKF	Extended Kalman Filter
FM	Frequency Modulation
GLONASS	Globalnaya Navigazionnaya Sputnikovaya Sistema
GDPR	General Data Protection Regulation
GNSS	Global Navigation Satellite System
GPS	Global Positioning System
IMU	Inertial Measurement Unit
IoT	Internet of Things
IPS	Indoor Position System
k-NN	k-Nearest Neighbors
LBS	location-based service
LOS	Line-of-sight
LS	Least Square
LTE	Long-Term Evolution
MEMS	Microelectro-Mechanical System
NLLS	Non-Linear Least Square
NLOS	Non-line-of-sight
PDR	Pedestrian Dead Reckoning
PRISMA	Preferred Reporting Items for Systematic Reviews and Meta-Analyses
RF	Radio Frequency
RFID	Radio-Frequency Identification
RMSE	Root Mean Square Error
RSS	Received Signal Strength
RSSI	Received Signal Strength Indicator
SVM	Support Vector Machine
TDoA	Time Difference of Arrival
ToA	Time of Arrival
ToA/ToF	Time of Arrival/Flight
TWR	Two-way Ranging
UDP	User Datagram Protocol
UTDoA	Uplink Time-Difference-of-Arrival
UWB	Ultra-wide band
VLC	Visible Light Communication
WASP	Wireless Application Service Provider
Wi-Fi	IEEE 802.11Wireless LAN
WSN	Wireless Sensor Network