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. 2023 Jul 3;23(13):6120. doi: 10.3390/s23136120

Table 4.

Topics, number of papers, keywords, word clouds, and curves for each cluster.

Research Topic Keywords Word Cloud Article Growth Trend
Cluster 1
Wireless Channels (2002–2022)		 Channels (0.707)
Vehicle-to-Vehicle (0.352)
Model (0.146)
MIMO (0.140)
Modeling (0.098)
Characterization (0.0746)		 graphic file with name sensors-23-06120-i001.jpg graphic file with name sensors-23-06120-i002.jpg
Cluster 2
Communication protocols (2003–2022)		 MAC (0.280)
Networks (0.272)
Protocol (0.216)
VANETs (0.171)
Safety (0.168)
Control (0.144)		 graphic file with name sensors-23-06120-i003.jpg graphic file with name sensors-23-06120-i004.jpg
Cluster 3
VANETs
(2004–2022)		 VANETs (0.262)
Networks (0.231)
Ad (0.227)
hoc (0.227)
networks (0.171)		 graphic file with name sensors-23-06120-i005.jpg graphic file with name sensors-23-06120-i006.jpg
Cluster 4
Security and Privacy Protection Protocols (2006–2022)		 Security (0.292)
Privacy (0.265)
Authentication (0.262)
Networks (0.181)
VANETs (0.180)		 graphic file with name sensors-23-06120-i007.jpg graphic file with name sensors-23-06120-i008.jpg
Cluster 5
Resource allocation and optimization
(2006–2022)		 Communications (0.475)
Networks (0.317)
V2X (0.214)
Resource (0.161)
Allocation (0.148)
5G (0.108)		 graphic file with name sensors-23-06120-i009.jpg graphic file with name sensors-23-06120-i010.jpg
Cluster 6
Autonomous Cruise Control (ACC) (1994–2022)		 Control (0.397)
Connected (0.372)
Traffic (0.223)
Cooperative (0.135)
Automated (0.098)
Communication (0.098)		 graphic file with name sensors-23-06120-i011.jpg graphic file with name sensors-23-06120-i012.jpg
Cluster 7
Deep Learning and Edge Computing
(2013–2022)		 Computing (0.468)
Internet (0.421)
Edge (0.284)
Offloading (0.273)
Learning (0.200)
Reinforcement (0.126)
Deep (0.121)		 graphic file with name sensors-23-06120-i013.jpg graphic file with name sensors-23-06120-i014.jpg