Mobile Small-Cell Deployment Strategy for Hot Spot in Existing Heterogeneous Networks

Abstract

Abstract-As the mobile data demand keeps growing, an existing heterogeneous network (HetNet) composed of macrocells and small cells may still face the problem of not being able to provide sufficient capacity for unexpected but reoccurring hot spots. In this paper, we propose a mobile small-cell deployment strategy that avoids replanning the overall network while fulfilling the hot spot demand by optimizing the deployment of additional mobile small cells on top of the existing HetNet. We formulate the problem as a joint optimization over the number and locations of mobile small cells and the user associations of all cells in order to maximize the minimum user throughput. In order to solve it, we first propose a Fixed Number Deployment Algorithm (FNDA) to solve the problem with a fixed number of new small cells. Afterwards, we extend FNDA into a Deployment Over Existing Network Algorithm (DOENA) to solve the joint optimization problem. The simulation results show that DOENA offers a higher minimum user throughput while requiring less mobile small cells to be deployed than the deployment optimization based on maximizing sum user throughput.

Robust coordinated transmission for cooperative small cell networks

“…In this paper, we consider a heterogeneous coordinated transmission scenario, where there exist hotspot areas with high demand for wireless services for a large number of UEs while the number of UEs rapidly decreases at the outside of hotspot areas. In fact, heterogeneous networks with hotspot areas are actively being studied, because it is challenging to satisfy the QoS requirements for a large number of UEs in hotspot areas [14, 15]. In [14], it was shown that heavy traffic demands in hotspot areas may degrade the network performance, and in order to successfully take care of excessive service requests from UEs, SBSs should be appropriately deployed in locations where the interference from an MBS is not strong.…”

“…In [14], it was shown that heavy traffic demands in hotspot areas may degrade the network performance, and in order to successfully take care of excessive service requests from UEs, SBSs should be appropriately deployed in locations where the interference from an MBS is not strong. In [15], it was proposed to exploit mobile SBSs in heterogeneous networks in order to satisfy the QoS requirements for UEs in hotspot areas. However, because SBSs deployed in hotspot areas are easily overloaded with a large number of UEs, the QoS requirement for UEs may not be satisfied in the hotspot areas.…”