Improving Efficiency in Resource Allocation Of OFDMA Femtocell Networks

Interference control is one of the fundamental challenges in resource allocation of femtocell networks that use orthogonal frequency-division multiple access (OFDMA). Inthis paper, a method is proposed that reduces the interference between femtocells. This method is implemented by thefemtocells in a self organizing manner and increases frequency reuse factor. Thus, the network throughput will increase and the fairness between femtocells remains reasonable we also propose a mechanism that can be applied increase the frequency resources assigned to each femtocell. These newfrequencies can be used when femtocells require more frequency resources to carry higher traffic loads. Results of simulations show the improvement of the first method compared to the previous methods. It is also demonstrated that by applying the second mechanism in a high-load condition of the network, a considerable improvement is observed in its throughput. (Between 20-120% improvements

Keywords:

femtocell , resource allocation , orthogonal frequency-division multiple access (OFDMA) , frequency reuse , throughput