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Table 1 Challenges and requirements for CR-VANETs

From: Cognitive radio for vehicular ad hoc networks (CR-VANETs): approaches and challenges

Challenges Required mechanisms
Reliable delivery of safety messages QoS support
Highly dynamic topologies Algorithms with fast
  convergence time
Scarce spectrum Efficient use of spectrum
Newer and several technologies Reprogrammability
Varied environment and Machine learning algorithms
spectrum availability