Abstract
The tremendous increase in wireless connectivity demand will result in the degradation of the service quality and the scarcity of network capacity and coverage in the beyond 5 $^{\mathrm{ th}}$ generation era. To ensure reliable connectivity and enhance the network’s performance, the evolution of heterogeneous networks (HetNets) must incorporate aerial platforms in addition to traditional terrestrial base stations. The performance of Aerial-HetNets (A-HetNets) is largely dependent on the users’ association. The conventional user-association scheme based on downlink received power provides sub-optimal performance for the edge users. For this reason, decoupled user-association along with the reverse frequency allocation (RFA) strategy has been employed in A-HetNets. The performance of A-HetNets is also affected if wide-band jammers (WBJs) are present in the vicinity and impose jamming interference. In this paper, a two-tier A-HetNet with RFA and decoupled access is analyzed in the presence of jamming interference. The obtained results show that for a signal-to-interference ratio threshold of −20 dBm, the percentage decrease in the coverage probability of the decoupled access due to WBJ activity is up to 7.4%, 13.5%, and 19.7%, for the average number of WBJs equal to 2, 4, and 6, respectively. The performance of the decoupled access in A-HetNets is further decreased by increasing the transmit power of the WBJs while it is increased by increasing the radius of the WBJ’s cluster.
Highlights
The evolution of 5th generation (5G) of wireless networks can increase the data demands, service types, and scale of wireless networks
Dissimilar to [11], where authors considered a worst case scenario in which wide-band jammers (WBJs) are only present around the target user equipment (UE); we model WBJs according to an Matern cluster process (MCP) such that the WBJs are uniformly-distributed within a cluster
This is due to the fact that the distance-dependent pathloss between the low-altitude platforms (LAPs) and the target user is smaller than the distance-dependent pathloss between the high-altitude platforms (HAPs) and the target user which results in higher UL SIR and the coverage probability
Summary
The evolution of 5th generation (5G) of wireless networks can increase the data demands, service types, and scale of wireless networks. We use RFA along with the decoupled access to improve networks’ coverage performance by abating the inter-tier interference of multiple UAVs and the jamming interference of the WBJs. Without decoupling, [24] analyzed a multi-tier A-HetNet which is similar to the traditional cellular HetNet. Therein, the HAPs and the LAPs are modeled using an independent and homogeneous Poisson point process (HPPP) and derived the analytical expression of the outage probability without considering RFA and decoupled access. In [11], [25], the authors analyzed the coverage probability in conjunction with RFA, jammers, and decoupled access This performance is limited due to the assumption that the same pathloss exponent is considered across all the tiers of a multi-tier cellular HetNet. the authors in [11] assumed that the jammers are always present in a single circular cluster around the target UE which is not a realistic approach as the jammers can be located in multiple-clusters and with different centers.
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