[ANGLÈS] The increasing popularity of connected devices and the augmentation of users' number are boosting the mobile broadband traffic, which has grown exponentially during the last years. Also costumers' expectations are on the rise, users have come to expect a consistent, high-quality and seamless mobile broadband experience everywhere. To meet these expectations, the capacity and the coverage of the current networks need to be improved to deliver high data throughput with very low latency. Since spectrum has become a scarce resource nowadays, new ways have to be found to improve the network performance. The key options to achieve this target include improving and densifying the existing macro layer and complementing the macro layer with low power nodes; that is to say, deploying heterogeneous networks. The concept of heterogeneous networks has recently attracted considerable interest as a way to optimize the performance of the network, particularly for unequal user or traffic distribution situations. A heterogeneous network is composed of multiple radio access technologies, architectures, transmission solutions, and base stations of varying transmission power that can interoperate, thus creating a multilayer structure. Due to the different operating modes of the nodes, some of them work in open access mode but others work in closed access mode, and the unbalanced transmission power of the different base stations of the network, select the appropriate server station can be challenging for the users' equipments. A wrong cell selection process can lead to the under-utilization of low power nodes; so that, range extension technique is proposed to allow more users to be attached to low power nodes. Manage the interferences caused by the macro station to the low power nodes and vice versa is one of the biggest challenges in the deployment of heterogeneous networks. Enhanced Inter Cell Interference Coordination (eICIC) schemes have been proposed to deal with this problem. These approaches can be divided into time domain techniques, such as Almost Blank Sub-frames (ABS), and frequency domain techniques. Their implementation relays in the use of some basic characteristics of the radio access technology used in the network. This project is structured as follows: in Section 1 the concept of heterogeneous networks is defined, deepening in to the factors that have led to their apparition. Different techniques to address the major technical challenges of heterogeneous deployments are described in Section 2. In Section 3, the main techniques to deal with intra-frequency interference are introduced. Finally, one of the methods described in the previous section, the time domain technique, is explained in detail in Section 4.