Interference modeling for energy aware geographical routing in cognitive radio ad hoc networks

In an energy constrained cognitive radio ad-hoc network, protecting primary users from interferences caused by secondary users and saving more energy are crucial aims. In designing interference aware routing protocols, correct modeling of the interference is an important factor that affects the network performance considerably. In this paper, we propose an interference and energy aware geographical routing algorithm for cognitive radio ad-hoc networks by considering two different interference models. The novelty of the proposed algorithm lies in the new modeling of the interference and proposing a normalized linear utility function to have more control over design metrics such as end-to-end delay, aggregate interference energy and goodput. In proposed algorithm, we estimate the total interference power caused by secondary users in two ways: i) By using the path loss model, and ii) By considering the overlap areas between the secondary and primary users. The performance of the proposed algorithm is evaluated for both interference models from different perspectives such as end-to-end delay, average aggregate interference energy and goodput. The simulation results clarify the efficiency of the proposed scheme compared to the Spectrum and Energy aware Routing algorithm suggested in [1].