Uplink Interference Mitigation for OFDMA Femtocell Networks
Femtocell networks, consisting of a conventional macro cellular deployment and overlaying femtocells, forming a hierarchical cell structure, constitute an attractive solution to improving the macrocell capacity and coverage. However, the inter- and intra-tier interferences in such systems can significantly reduce the capacity and cause an unacceptably high level of outage. This paper treats the uplink interference problem in Orthogonal Frequency-Division Multiple-Access (OFDMA)-based femtocell networks with partial co-channel deployment. The authors first propose an intertier interference mitigation strategy without the femtocell user's power control by forcing the femto-interfering macrocell users to use only some dedicated subcarriers. The non-interfering macrocell users, on the other hand, can use either the dedicated subcarriers, or the shared subcarriers which are also used by the femtocell users.