Abstract
The deployment of low power small base stations (SBSs) in high density user areas enhances the performance of heterogeneous cellular networks (HCNets). Such user-centric SBS deployment (UCSD) is more appropriate as compared with the conventional uniformly deployed user equipment (UE) based HCNets, because it captures the correlation between UEs and SBSs. In the literature, the downlink (DL) performance of UCSD based HCNet (UC-HCNet) has been analyzed under maximum received signal power (MRSP) association strategy. In this paper, we develop and analyze the uplink (UL) performance of UC-HCNets with decoupled UL-DL association (DUDA) using stochastic geometery. We evaluate the total UL interference considering two special cases of Poisson cluster process (PCP), i.e., Matern cluster process (MCP) and Thomas cluster process (TCP), in UC-HCNet. The proposed DUDA scheme enhances the system performance gain by assuming dual connectivity of UE and BSs in the UL and DL directions. Furthermore, fractional power control (FPC) policy is considered to limit the UL power consumption. The system performance is evaluated in terms of outage probability and rate coverage. The numerical results are validated through simulations. Numerical results show that the performance improvement of DUDA in sparse scenario is higher as compared with dense scenario. Furthermore, it is investigated that the performance gain of DUDA is higher for larger UE variance and cluster radius in case of MCP and TCP, respectively.
Highlights
The global demand for mobile data rate increases day by day due to the increasing popularity of multimedia applications and internet enabled portable devices such as smart phones and tablets
The outage probability versus signal-to-interference-plus-noise ratio (SINR) threshold for different values of cluster radius in case of Matern cluster process (MCP) based UC-heterogeneous cellular networks (HCNets) is shown in Fig. 3 (a)
The outage probability versus SINR threshold for different value of user equipment (UE) variance in case of Thomas cluster process (TCP) based UC-HCNet is presented in Fig. 3 (b)
Summary
The global demand for mobile data rate increases day by day due to the increasing popularity of multimedia applications and internet enabled portable devices such as smart phones and tablets. In capacity driven UCSD, the SBSs are assumed to be deployed in the areas with crowded UEs to enhance the performance of HCNet. The authors in [28] studied a two-tier HCNet with multi-channel hybrid access, by modeling the locations of the clustered femto cell according to VOLUME 8, 2020. The authors in [39], [40] extended the model in [38] and analyzed the impact of fading environment and load balancing All these prior works on capacity driven UC-HCNet analyzed DL performance with CUDA between UEs and BSs. To the best of our knowledge the work in [41] analyzed the UL performance of HCNet with conventional decoupling while considering MCP distributed UEs, while ignoring the significance of cluster center SBS and power control.
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