Clustering-based Handover and Resource Allocation Schemes for Cognitive Radio Heterogeneous Networks
Shahriar Shirvani Moghaddam, Mahyar Shirvanimoghaddam, Ameneh Habibzadeh · 2018
We propose a resource allocation and clustering strategy for the handover of both primary and secondary users in a Femtocell-based cognitive radio heterogeneous network (CR-HetNet). We consider two resource allocation and clustering schemes, where the first approach, referred to as resource allocation-clustering (RC), first allocates the resources to the Femtocells and then performs the clustering. In the second approach, namely joint clustering-resource allocation (JCR), clustering and resource allocation will be performed simultaneously. Numerical results suggest that although the utility function of primary and secondary users increases with the number of clusters, the number of horizontal handovers within the cluster reduces and the horizontal handovers between the clusters increases. It also reduces the energy efficiency and the maximum achievable throughput in each cluster. There is a tradeoff between the utility function and the maximum throughput of secondary users that can be well maintained by choosing a proper number of clusters and appropriate resource allocation. Finally, simulation results and numerical analyses show that one can reduce the handover execution time by 25% compared to the conventional approach that no clustering is performed in a network consisting of 10 Femtocells.