Temporary Cognitive Femtocell Network for public safety LTE

In this paper we address the deployment of a temporary cognitive secondary LTE Femtocell network in order to supplement and enhance the coverage of a regular LTE network for public safety communications. We propose a novel approach in deploying such cognitive secondary network by exploiting the latest LTE-Advanced HetNet capabilities. We also present two interference mitigation techniques for mitigating the interference caused by the presence of the secondary cognitive LTE network. Simulation results are presented to show the enhancement in the coverage when such a secondary network is deployed together with the proposed interference mitigation techniques.