Resource management in heterogeneous cellular systems with small moving cells

Abstract

Deployment of small cells has received a great attention as one of feasible technologies to support explosively increasing traffic demands in cellular communication systems. However, it may involve technical issues, including the management of handovers and cross-tier interference near the cell boundary. In this thesis, we consider deployment of small moving cells (SMCs) in a heterogeneous cellular communication system that employs fixed small cells such as femto- and pico-cells. SMCs can have mobility while providing services for a small number of users in a very short transmission range. We assume that SMCs can make communications among them through a side-haul link for their cooperative operation and make communications with the macro cell through a wireless back-haul. We also assume that the macro cell and SMCs orthogonally share resource to avoid cross-tier interference. We consider resource management for SMCs to maximize the transmission performance by exploiting the mobility of SMCs. For ease of implementation, we consider the resource allocation by coordination among SMCs without involvement of the macro cell. Exploiting that the peak-to-average load ratio (PALR) is larger than 1, we can minimize the resource utilization for SMCs, while allowing them to utilize the resource orthogonal to each other. Thus, the proposed scheme can make SMCs operate without experiencing inter-cell interference. It also virtually reduce the PALR of cells, which is one of major concerns for resource saving operation. Finally, the performance of the proposed scheme is verified by computer simulation.