Radio resource management in femtocell downlink exploiting location information

Femtocells (HeNB) deployed within macrocells (MeNB) coverage area may use the same spectrum for communication, causing interference on both MeNB users (MUE) and other HeNB users (HUE). Under this scenario, radio resource management (RRM) is a challenging task to mitigate the interference on both the users. In order to minimize this, we propose an interference-aware local cartography-based RRM (LC-RRM) technique for HeNB with the knowledge of corresponding HUEs location. In particular, with the measured interference values on each resource block (RB) at existing HUEs location, we compute interference cartography (IC) diagram for HeNB coverage area using spatial interpolation algorithm. Using IC diagram, HeNB applies interference classification algorithm to classify the RBs and uses them according to the proposed dynamic fractional frequency reuse (FFR) scheme at desired location, and uses them for transmission with appropriate transmit power without producing interference above the critical values at both MUEs and neighbouring HUEs. Our analysis reveals that the proposed approach achieves higher throughput than interference-unaware RRM techniques, while the interference introduced to the MUE remains within a tolerable limit.