A reliable spectrum aggregation protocol in Cognitive Radio Network

Cognitive Radio Ad-Hoc Network (CRAHN) is an emerging technology where the wireless devices can make use of spectrum opportunistically in absence of primary user so that the problem of spectrum scarcity can be reduced. In this paper we propose a reliable spectrum aggregation protocol. When two nodes simultaneously start transmitting the packets on same channel then collision occurs and data is lost. The main objective of this paper is to reduce the probability of collision occurring during transmission in spectrum aggregation based cooperative routing protocol.