On QoS routing in Mobile WiMAX cognitive radio networks

Throughput maximization is one of the main challenges in cognitive radio ad hoc networks, where the availability of local spectrum resources may change from time to time and hop by hop. Technologies based on 802.16e which called Mobile WiMAX (Worldwide Interoperability Microwave Access) promises to deliver high data rates over large distances and deliver multimedia services and are expected to play a major role in high speed broadband delivery. The maximum allowed number of hops must be carefully considered because higher number of hops will increase the transmission time and degrades the throughput and end to end delay. Multi-hop based network may also improve the system performance by using cooperative relay technique. There are various challenges for the routing in WiMAX mesh such as delay, long transmission scheduling, and increasingly stringent Quality of Service (QoS) support and load balance and fairness limitations. In this paper we use cognitive radio network composed of wireless devices able to opportunistically access the shred radio resource. The core of such networking paradigm is the capability of cognitive radio to monitor spectrum occupation to exploit spectrums holes for transition. Extensive simulations are conducted under MATLAB and compare the performance of our routing protocol with AODV for Mobile WiMAX environment. The propose algorithm shows high throughput, reduce end to end delay, and increase packet delivery ratio.