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Cognitive radio technology offers an important function in the efficientutilization of the radio spectrum. Besides, it is expected that CR-enabledvehicular ad-hoc networks (CR-VANETs) enrich the communication performance ofthe existing vehicular networks (VANETs). However, to ensure efficientperformance in a multi-hop communication, the routing protocol in CR-VANETsneeds to consider the autonomous mobility of the vehicles as well as thestochastic availability of the channels. Hence, this paper introduces aspectrum-aware mobility pattern based reactive routing protocol for CR-VANET.The proposed protocol accommodates the dynamic behavior and selects a stabletransmission path from a source node to the destination. Therefore, theproposed protocol is outlined as a weighted graph problem where the weight foran edge is measured based on a parameter termed as NHDF (Next-hop DeterminationFactor). The NHDF implicitly considers mobility patterns of the nodes andchannel availability to select the optimum path for communication. Therefore,in the proposed routing protocol, the mobility pattern of a node is definedfrom the viewpoint of distance, speed, direction, and node's reliability.Furthermore, the spectrum awareness in the proposed protocol is measured overthe number of shared common channels and the channel quality. It is anticipatedthat the proposed protocol shows efficient routing performance by selectingstable and secured paths from source to destination. Simulation is carried outto assess the performance of the protocol where it is witnessed that theproposed routing protocol outperforms existing ones.

A Spectrum Aware Mobility Pattern Based Routing Protocol for CR-VANETs