Table 1 List of common abbreviations.

From: Deep reinforcement learning framework for joint optimization of multi-RAT UAV location and user association in heterogeneous networks

Abbreviation

Full name

Abbreviation

Full name

6G

Next Generation of Wireless Communication Networks

MDP

Markov Decision Process

AC

Actor-Critic

Multi-RAT

Multi-Radio Access Technology

CDF

Cumulative Distribution Function

NOMA

Non-Orthogonal Multiple Access

C-NOMA

Clustered-Non-Orthogonal Multiple Access Technique

QoS

Quality of Service

CQI

Channel Quality Indicator

RTS

Request-To-Send

DDPG

Deep Deterministic Policy Gradient

SER

Satisfaction-to-Energy Ratio

DFL

Distillation Federated Learning

SINR

Signal to Interference plus Noise Ratio

DRL

Deep Reinforcement Learning

SNR

Signal to Noise Ratio

FBSs

Femto Base Stations

TDD

Time Division Duplexing

FL

Federated Learning

UBSs

UAV Base Stations

HAPS

High Altitude Platform Station

UFBSs

UAV Femto Base Stations

HetNets

Heterogeneous Networks

UWAPs

UAV Wi-Fi Access Points

MBS

Macro Base Station

VoWiFi

Voice over Wi-Fi