3GPP	3rd-Generation Partnership Project
5G	Fifth Generation
5GC	5G Core
B5G	Beyond 5G
BBM	Break-Before-Make
BS	Base station
CHO	Conditional Handover
CIO	Cell Individual Offset
CSI	Channel State Information
D2D	Device-to-Device
DoA	Directional of Arrival
DRL	Deep Reinforcement Learning
eMBB	Enhanced Mobile Broadband
EPC	Evolved Packet Core
FD	Full Duplex
FHO	Frequent Handover
FLC	Fuzzy-Logic Controller
HCP	Handover Control Parameter
HD	High-Definition
HetNet	Heterogeneous Network
H-HO	Hard Handover
HHO	Horizontal Handover
HO	Handover
HPPP	Handover Ping-Pong Probability
HODP	Handover Decision Parameter
HOET	Handover Execution Time
HOF	Handover Failure
HOFR	Handover Failure Rate
HOIT	Handover Interruption Time
HOM	Handover Margin
HOPP	Handover Ping-Pong
HOSR	Handover Success Rate
ICI	Inter-Cell Interference
ICIC	Inter-Cell Interference Coordination
IoT	Internet of Things
ITU	International Telecommunication Union
KF	Kalman Filter
KNN	K-Nearest Neighbors
HOPP	Handover Ping-Pong
HOSR	Handover Success Rate
ICI	Inter-Cell Interference
ICIC	Inter-Cell Interference Coordination
IoT	Internet of Things
ITU	International Telecommunication Union
KF	Kalman Filter
KNN	K-Nearest Neighbors
KPI	Key Performance Indicator
LB	Load Balancing
LBO	Load-Balancing Optimization
LTE	Long-Term Evolution
MBB	Make-Before-Break
MBS	Macro Base station
MC	Macro Cell
ML	Machine Learning
M-MIMO	Massive Multiple-input–Multiple-output
mMTC	Massive Machine-Type Communication
mm-Wave	Millimeter Wave
MR	Measurement Report
MRO	Mobility Robustness Optimization
NFV	Network Function Virtualization
NG	Next-Generation
NN	Neural Network
NR	New Radio
NSA	Non-Standalone
OP	Outage Probability
QoE	Quality of Experience
QoS	Quality of Service
RAT	Radio Access Technology
RL	Reinforcement Learning
RLF	Radio Link Failure
RLFR	Radio Link Failure Rate
RSRP	Reference Signal Received Power
RSRQ	Reference Signal Received Quality
RSS	Received Signal Strength
RSSI	Received Signal Strength Indicators
SA	Standalone
SC	Small Cell
SDN	Software-Defined Networking
SE	Spectral Efficiency
S-gNB	Source gNB
S-HO	Soft Handover
SNR	Signal-to-Noise Ratio
TEHO	Too-Early Handover
T-gNB	Target gNB
Time-to-Trigger	TTT
TLHO	Too-Late Handover
UAV	Unmanned Aerial Vehicle
UD-HetNet	Ultra-Dense HetNet
UDSC	Ultra-Dense Small Cell
UE	User Equipment
UHO	Unnecessary Handover
URLLC	Ultra-Reliable Low-Latency Communication
V2V	Vehicle-to-Vehicle
V2X	ehicle-to-Everything
VHO	Vertical HO
WCS	Wireless Communication Systems