Macro-cells are not very efficient [1] in the residential area due to penetration problems that have been mentioned in a previous article, also in the macro-cells there are many users and is more difficult to provide QoS to all of them. For these reasons Internet Service Providers (ISP) have opted for femto-cell implementation at residential level, in order to increase the quality of services provided.

Femto-cells are low-power base stations that provide low cost and high quality wireless services to residential, in this area offer a coverage of approximately 10 m [2], which are designed to integrate automatically with macro-cell networks. Femto-cells integrate with mobile operator through a broadband connection, typically DSL [2] and [3], as can be seen in Figure # 1. However it can also be performed by a wireless link as mentioned in [4]. In General, the femto-cell redirects the traffic from the home cellular system, through the broadband connection, releasing the resource consumption of the macro-cell.

Figure # 1. Typical Femto-cell [3].