Decoupled Downlink and Uplink Access for Aerial Terrestrial Heterogeneous Cellular Networks

Abstract

To enable reliable connectivity in highly dynamic and dense communication environments, aerial-terrestrial heterogeneous cellular networks (AT-HCNs) have been proposed as a plausible enhancement to the conventional terrestrial HCNs (T-HCNs). In dense urban scenarios, users are often located in clusters and demand high bandwidth in both downlink (DL) and uplink (UL). We investigate this scenario and model the spatial distribution of clustered users using a Matern cluster process (MCP). Based on our analysis we then argue that decoupling of DL and UL in such a setting can significantly improve coverage performance and spectral efficiency. We further obtain closed-form expressions for the system coverage probability, spectral efficiency, and energy efficiency by using the Fox H-function. The obtained results confirm the validity of the proposed analytical model. Our simulations further indicate a significant performance improvement using decoupled access and provide quantitative insights on AT-HCN system design. INDEX TERMS Heterogeneous cellular networks, Downlink and uplink decoupling, Matern cluster process, Poisson point process, Unmanned aerial vehicles.

Clustered Jamming in Aerial HetNets With Decoupled Access

“…Therefore, it is important to consider the user-association by exploiting the joint DL and UL access. To address this issue, decoupled access for A-HetNets is proposed, where the target UE is allowed to associate with the multiple UAVs based on joint DL and UL association [17]. In the decoupled accsss for A-HetNets, the target user connects to HAP in DL while to LAP in UL.…”

“…Further, their work lacks the analysis of RFA strategy in the presence of jammers. • The authors in [17] investigate the performance of the decoupled access for a two-tier A-HetNet. However, their work lacks the joint analysis of RFA and jammers.…”

“…In this paper, we enhance the system model adopted in our previous work in [17] by employing RFA in the presence of WBJs to investigate the performance of the decoupled A-HetNets in UL.…”

“…In practical scenarios, the UEs located in the vicinity of cell-edge boundary facilitate decoupled access. Furthermore, the authors in [17], [20] showed that the decoupled access leverages better performance gains for the decoupled-enabled regions, therefore, we derive the association probability of the UEs located in the decoupled-enabled regions. The decoupled access for the decoupled-enabled regions is expressed as [17] A…”

“…Since, the decoupled-enabled regions leverage better performance gains with the decoupled access, therefore, we focus to derive the distribution of the target UE located in the decoupled-enabled regions and the target user [20], [30]. For the target UE located in the decoupled-enabled regions, its PDF distance to the serving LAP is expressed as [17] f (D)…”