Heterogeneous cellular Network (HetNet) has emerged as a promising technology for the 5th generation mobile networks (5G) that can be used to meet the high demand of data rate and better quality of service (QoS) performance. However, the performance of HetNet will depend on how scarce resources such as frequency, time, power and spatial resource are shared among user equipments (UEs) in the system and also how interference is controlled. In this work, we utilize UE-centric clustering as a tool to effectively determine the interfering BSs that cause significant interference to each UE in the network. These interfering BSs together with the serving BSs of these interfered UEs will coordinate and make resource allocation decision together to allocate spatial directions to each UE in the network in order to manage interference in the network. We formulate the resource allocation problem as maximizing the weighted sum-rate of HetNet while fulfilling some power, QoS and interference constraints. This optimization problem is non-convex. We readily split the RA problem into two sub-problems: the spatial direction allocation problem and the power allocation problem respectively. We are able to solve these problems efficiently using SeDumi, which provides a general purpose implementation of interior point methods. Simulation results of our proposed method, when compared with the other existing methods, show significant improvement.
CORE (COnnecting REpositories)
CORE (COnnecting REpositories)