• Subrat Kumar Sethi

With the advent of wireless networking, two emerging concepts, namely Cognitive Radio Networks(CRN) and Vehicular Ad hoc Networks (VANETs), have garnered significant attention. Cognitive Radio Networks possess the ability to acquire knowledge of their operational geographical environment, enabling effective spectrum management between primary and secondary users. On the other hand, VANETs are instrumental in sharing emergency safety messages among vehicles to ensure the safety of road users. The integration of Cognitive Radio Networks in VANETs presents several advantages, including efficient spectrum utilization and enhanced VANET deployment support. However, this amalgamation also poses unique challenges. The random fluctuations in spectrum users, unpredictable nature of VANETs, high mobility of vehicles, varying interference levels, security concerns, packet scheduling, and priority assignment complexities demand careful attention. In this paper, we conduct an exhaustive survey and critical analysis of these challenges in cognitive VANET environments. Additionally, we discuss open issues, highlight key challenges, and propose performance metrics for diverse cognitive radio VANET applications to foster advancements in this domain.

CRN, Interference, Packet Switching, Priority Assignment, Velocity, VANET

"Challenges and Prospects of Cognitive Radio-Enabled Vehicular Ad Hoc Networks", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.4, Issue 12, page no.476-483, December-2017, Available :http://www.jetir.org/papers/JETIR1712247.pdf

"Challenges and Prospects of Cognitive Radio-Enabled Vehicular Ad Hoc Networks", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.4, Issue 12, page no. pp476-483, December-2017, Available at : http://www.jetir.org/papers/JETIR1712247.pdf