Interference Mitigation in Femtocell using Optimized Power Control

Background

The Femtocells system like any other cellular communication technologies has a problem of the interference from other neighboring cells such as Macro, Micro and Pico cells. When a signal that is being transmitted from the Femtocell system to the user in the cell. Other users of the same network in other cell such as the Macro user are affected by the signal transmission of that femtocell as well as the other femtocell user.

Femtocell systems are expected to increase the capacity of the system in terms of number of users per cells or data rate per user. This because of the dedicated backhaul through fixed DSL, in opposite to micro and picocells which their backbone is taken directly from the macrocell Base Station (BS). Several challenges femtocells have to solve before they can be deployed, such as, seamless mobility and handover between different cells, spectrum allocation, sharing, and interference problems. The interference is one of the serious challenges that face the femtocell deployment since it affects the quality and the throughput of the system. Femtocell is suffers from interference from other femtocells and macrocell base stations. This due to the large number of FBS would be deployed by the customer in their premises. This interference is reducing the performance of FBS seriously if not tolerated. Interference can be in the form of femto-femto cells or femto-macrocells interference.

There are many scenarios that the femtocell will encounter interference problems because of it. Co-layer interference is one of it and it is described as the unwanted signal received at a femtocell and sent from other femtocells, decreasing thus the quality of its communication thus will cause many problems as follow: