Abstract
One of the main trends in the fifth generation (5G) cellular network is the bifurcation of systems that enable network densification. With this trend, ultra-dense networks (UDN) become a pillar technology to provide high data rates gains. However, these gains come at the expense of more complex interference and higher handover frequency. The user-centric virtual cell conception has been proposed to solve these problems. But it still has encountered some challenges in practical application. In this paper, we propose a fuzzy logic-based virtual cell design to balance data rates and resource overhead in order to improve virtual cell applicability. In our design, we consider a practical UDN scenario with imperfect channel state information (CSI) feedback and model it by stochastic geometry theory. Then, we find the optimal radius of virtual cells by maximizing the system spectral efficiency. On the basis, we propose a fuzzy logic-based activation strategy selection (FASS) algorithm to rationally choose the virtual cell activation threshold and resources allocation scheme under different traffic loads and quality of service (QoS) requirement. Simulation results demonstrate that the proposed solution can effectively eliminate the interference, obviously improve the user’s system spectral efficiency and dynamically adapt to different traffic loads.
Highlights
The fifth generation (5G) wireless networks are required to satisfy the increasing user population and their traffic demands
The specific algorithm is as follows: 5 Results Monte Carlo simulations are carried out to evaluate the performance of proposed virtual cell design and the FAAS algorithm in ultra-dense networks (UDN) environment
In order to harvest densification gains, we proposed a virtual cell design to overcome the complex interference and frequent handover
Summary
The fifth generation (5G) wireless networks are required to satisfy the increasing user population and their traffic demands. More complex interference and frequent handover will offset gains To meet these challenges, the user-centric virtual cell concept has been proposed [3]. In [11], a novel user-centric CoMP scheme was proposed to improve energy efficiency in dense heterogeneous network. We propose a novel fuzzy-based virtual cell design to balance data rates and practical resource overhead by flexible activation strategies. Ia is “silent” scheme, which indicates resources allocated for NCJT cannot be reused by other inactive BSs in a virtual cell. Ia is “reuse” scheme, which indicates resources allocated for NCJT can be reused by other inactive BSs. All active BSs in a virtual cell provide a non-coherent joint transmission for the user. The channel estimation error according to imperfect CSI is equivalent to a new interference resource.
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