Performance evaluation of QoS-CAODV, CAODV routing protocol in Cognitive Radio ad-hoc network

A large number of routing protocols for Cognitive Radio (CR) have been recently proposed to improve the efficiency of spectrum utilization. As an example, we can find the Cognitive Ad hoc On demand Distance Vector (CAODV). This protocol is based on AODV one and uses an on-demand approach for finding routes to which the principals of regions activity avoidance of the Primary User (PU) has been added during the packet transfer. The main drawback of this protocol is that it doesn´t support the Quality of Service (QoS) mechanisms. In this paper, we propose to develop, implement and test a new protocol that integrate the QoS adaption mechanism in cognitive on demand routing protocol. The new protocol, called QoS-CAODV, is a combination of QoS-AODV and CAODV. The performances of QoS-CAODV protocol have been evaluated by numerical simulations (OPNET 14.5). We have observed from results that the QoS-CAODV protocol provides better performance in term of average throughput, end-to-end delay and gives the smallest number of dropped packets.