Using TV White Space for interference mitigation in LTE Femtocell Networks

The traditional Femtocell shares the same licensed frequency band with Macrocell, thus introducing cross-tier interference. Interference mitigation between the Femtocell and Macrocell is considered to be one of the major challenges in Femtocells Network. In this paper, the released TV spectrum by the digital switchover named TV White Space (TVWS) is proposed to reduce the interference for the LTE Femtocell Network. Based on the combination of cognitive sensing and TVWS, a novel resource allocation scheme is applied to mitigate the interference that Macro users are suffering from nearby Femtocells. A single cell Long Term Evolution (LTE) Femtocell simulator is established to demonstrate the system performance. The cases with traditional resource allocation scheme and the proposed scheme are compared and analysed.