I. INTRODUCTION

II. C-V2X RESOURCES AND COMMUNICATIONS PROCEDURES  
A. Resources  
B. Sidelink Control Information  
C. Physical Layer  
D. MAC Layer: Scheduling  

III. C-V2X SECURITY AND POTENTIAL THREATS  
A. Identification, Authenticity, and Integrity  
B. Availability  
C. Confidentiality and Privacy  

V. RESEARCH DIRECTIONS

VI. CONCLUSIONS