  Cognitive radio (CR) technology will have significant impacts on upper layer
performance in mobile ad hoc networks (MANETs). In this paper, we study
topology control and routing in CR-MANETs. We propose a distributed
Prediction-based Cognitive Topology Control (PCTC) scheme to provision
cognition capability to routing in CR-MANETs. PCTC is a midware-like
cross-layer module residing between CR module and routing. The proposed PCTC
scheme uses cognitive link availability prediction, which is aware of the
interference to primary users, to predict the available duration of links in
CR-MANETs. Based on the link prediction, PCTC constructs an efficient and
reliable topology, which is aimed at mitigating re-routing frequency and
improving end-to-end network performance such as throughput and delay.
Simulation results are presented to show the effectiveness of the proposed
scheme.
