Abstract
In heterogeneous cellular networks (HetNets), densification of small base stations (SBSs) in the macro base station (MBS) coverage region leads to improved network coverage and capacity. However, this improvement is at the cost of inter-cell interference (ICI) due to the high MBS transmit power. The situation deteriorates further when uniformly deployed wideband jammers (WBJs) to initiate distributed denial-of-service (DDoS) attacks are present. With sufficient knowledge about the network parameters, WBJs produce substantial jammer interference (JI) by transmitting unwanted energy in the legitimate band. Such jamming attacks can cause significant JI in the UL communications of MBS edge users (M-EUs) due to i) low uplink (UL) transmit power of user equipment (UE) and ii) longer distances of M-EUs. As a result of ICI and JI, M-EUs are severely affected and go off the coverage due to a low received signal-to-interference ratio (SIR). Hence, to mitigate both ICI and JI, we use a proactive resource allocation scheme known as reverse frequency allocation (RFA). The results indicate that although ICI and JI significantly degrade network performance, RFA employment leads to improved SIR due to effective ICI and JI mitigation.
Highlights
We have investigated UL coverage in the presence of inter-cell interference (ICI) and jammer interference (JI) interference in multi-tier heterogeneous cellular networks (HetNets)
The paper assumes that macro base station (MBS), small base stations (SBSs), users, and Wideband jammers (WBJs) are uniformly deployed using independent homogeneous Poisson point processes (IHPPPs)
The results were generated by evaluating different network parameters such as the WBJs’ transmit power, WBJs’
Summary
In heterogeneous cellular networks (HetNets), small base stations (SBSs) are overlaid in the coverage region of a macro base station (MBS) to improve network coverage and capacity [1,2,3]. With the assumption of having sufficient knowledge about network parameters, such as frequency band, transmit power, and target locations, WBJs create coverage holes caused by jammer interference (JI) [10,11]. The uniform WBJs’ distribution leads to substantial JI and, renders a target out of coverage [13,14]. We assume that the network is flooded by low-power and low-cost WBJs to target UL communications of the M-EUs [9]. WBJs can lead to substantial JI and, push M-EUs off the coverage map [13,14]. Mitigation of both ICI and JI is a challenging task. We employ RFA to counter both JI and ICI in order to improve UL coverage
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