Abstract
Heterogeneous network (HetNet) is considered as the main and eminent future communication technology, since it achieves high spectral efficiency per unit area and saves energy due to low transmission power. Mass deployment of small cells in cochannel mode increases overall system capacity, but it is also coupled with greater risk of cochannel interference. This paper overviews the interference model based on the Poisson point process (PPP) and analyzes the performance in terms of energy efficiency in multitier HetNet. As the promising solution for improving the performance of HetNet, both the cooperative communication and cognitive radio techniques to mitigate the interference in HetNet are surveyed. As one example of cooperative communication techniques, a hierarchical cooperation scheme on the spectrum allocation is presented and its energy efficiency performance is analyzed and evaluated. Meanwhile, the energy efficiency increases from the cognitive radio technique are demonstrated as well. The energy efficiency performance comparison between the presented cooperative communication and cognitive radio techniques is emphasized, which suggests that the cooperation communication technique is preferred to suppress the interference and increase the energy efficiency in HetNets.
Highlights
Heterogeneous network (HetNet), which consists of a mix of generous macrocells and low-power nodes, for example, micro, pico, femto, relay node (RN), and remote radio head (RRH), has been seen as a promising approach for improving the spectrum and energy efficiency
In order to reduce the interference and improve the energy efficiency in HetNet, while increasing the resource utilization according to the load condition and small cells density, a hierarchical cooperation on the spectrum allocation is presented in this paper
A theoretical framework based on the random spatial models is utilized to analyze the interference characteristic and energy efficiency performance in multitier HetNet
Summary
Heterogeneous network (HetNet), which consists of a mix of generous macrocells and low-power nodes, for example, micro, pico, femto, relay node (RN), and remote radio head (RRH), has been seen as a promising approach for improving the spectrum and energy efficiency. A significant amount of research has been done to manage the cochannel interference (CCI) in a two-tier network, comprising a macrocell network overlaid with small cells [5] In this regard, much related research has focused on ways to investigate the interference, manage the resource, and improve the spectrum efficiency with the consideration for cooperative or cognitive schemes in HetNet. On one hand, in contrast to traditional noncooperative communications, different users and base stations are allowed to share the resources and to implement collaboration by information exchange in cooperative networks.
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