3GPP	3rd Generation Partnership Project
AI	Artificial Intelligence
AoI	Age of Information
B5G	Beyond-Fifth-Generation
BR-MP	Bernoulli-Rician Message Passing
CoAP	Constrained Application Protocol
CSI	Channel State Information
CSS	Chirp-Spread Spectrum
DL	Deep Learning
DRL	Deep Reinforcement Learning
DVB-RCS2	Digital Video Broadcasting—Return Channel via Satellite 2
eDRX	extended Discontinuous Reception
EM	Expectation-Maximization
FDD	Frequency-division Duplex
FL	Federated Learning
GEO	Geostationary Earth Orbit
GF-RA	Grant-Free Random Access
GNSS	Global Navigation Satellite System
HAPs	High-altitude platforms
HARQ	Hybrid Automatic Repeat Request
HSTN	Hybrid Satellite-Terrestrial Network
IIoT	Industrial Internet of Things
IMDs	IoT Mobile Devices
IoAT	Internet of Agricultural Things
IoBT	Internet of Battle Things
IoMT	Internet of Maritime Things
IoRT	Internet of Remote Things
IoST	Internet of Satellite/Space Things
IoT	Internet of Things
IoUT	Internet of Underground Things
IoUwT	Internet of Underwater Things
IPF	Iterative Penalty Function
LAPs	Low-altitude platforms
LEO	Low Earth Orbit
LPWAN	Low-Power Wide-Area Network
LTE-M	Long-Term Evolution Machine Type Communication
mMTC	Massive Machine Type Communication
MEC	Mobile Edge Computing
MEO	Medium Earth Orbit
ML	Machine Learning
MLTS	Multi-Layer Tabu Search
MQTT	Message Queuing Telemetry Transport
MTC	Machine Type Communication
NB-IoT	NarrowBand Internet of Things
NC	Network Coding
NOMA	Non-Orthogonal Multiple Access
NTN	Non-Terrestrial Network
PFD	Power Flux Density
PPP	Poisson Point Process
PSO	Particle Swarm Optimization
QoE	Quality of Experience
QoS	Quality of Service
RL	Reinforcement Learning
SBD	Short Burst Data
SGP4	Simplified General Perturbation 4
SIC	Successive Interference Cancellation
SINR	Signal-to-Interference-plus-Noise Ratio
S-IoT	Satellite Internet of Things
SLA	Service Level Agreement
SNR	Signal-to-Noise Ratio
STI	Spatially Temporally Correlative Mutual Information
UAV	Unmanned Aerial Vehicle
UCSS	Unipolar-coded CSS
UE	User Equipment
URLLC	Ultra-Reliable Low-Latency Communications
VLEO	Very Low Earth Orbit
WDP	Winner Determination Problem
WSN	Wireless Sensor Network