Network Densification in 5G: From the Short-Range Communications Perspective

Abstract

Abstract-Besides advanced telecommunications techniques, the most prominent evolution of wireless networks is the densification of network deployment. In particular, the increasing access points/users density and reduced cell size significantly enhance spatial reuse, thereby improving network capacity. Nevertheless, does network ultra-densification and over-deployment always boost the performance of wireless networks? Since the distance from transmitters to receivers is greatly reduced in dense networks, signal is more likely to be propagated from long-to short-range region. Without considering short-range propagation features, conventional understanding of the impact of network densification becomes doubtful. With this regard, it is imperative to reconsider the pros and cons brought by network densification. In this article, we first discuss the shortrange propagation features in densely deployed network and verify through experimental results the validity of the proposed short-range propagation model. Considering short-range propagation, we further explore the fundamental impact of network densification on network capacity, aided by which a concrete interpretation of ultra-densification is presented from the network capacity perspective. Meanwhile, as short-range propagation makes interference more complicated and difficult to handle, we discuss possible approaches to further enhance network capacity in ultra-dense wireless networks. Moreover, key challenges are presented to suggest future directions.

Limitation of SDMA in Ultra-Dense Small Cell Networks

“…Rayleigh fading is used to model smallscale fading for mathematical tractability. The rationality of Rayleigh fading assumption in UDN has been verified via experimental results in [7].…”

Robust Energy Efficient Beamforming in MISOME-SWIPT Systems With Proportional Secrecy Rate

“…Due to the tremendous growth of energy consumption, the wireless operators require new approaches to reduce their energy bills or maximize the energy utilization efficiency. Hence, the EE optimization is one of the most important research issues for the future generation wireless communications [39], [40]. When multiple EVEs exist in the wireless communication systems, a natural extension to the traditional EE optimization becomes secrecy energy efficiency (SEE) optimization.…”

Performance Analysis of Device-to-Device Communication Underlaying Dense Networks (DenseNets)

“…On the other hand, network densification [16], [17] is a combination of spatial densification (increasing number of antennas per node and access points/user density) and spectral aggregation resulting in improving spatial reuse as well as network capacity. Since the network densification introduces changes in the definition of networks in liu of density of APs, users and spectral resources, there are bound to be impact of this over the communication and thus has been analysed in literature [18]- [24].…”