An Overview on Interference Management in 3GPP LTE-Advanced Heterogeneous Networks

Ensuring ubiquitous mission-critical public safety communications (PSC) to all the first responders in the public safety network (PSN) is crucial at an emergency site. Recently, the use of unmanned aerial vehicles (UAVs) has received extensive interest for PSC to fill the coverage holes and establish reliable connectivity. The UAVs can be deployed as unmanned aerial base stations (UABSs) as part of a heterogeneous network (HetNet) PSC infrastructure. In this article, we design a PSC LTE-Advanced HetNet for different path loss models and deployment mechanism for UABSs. We enhance the system-wide spectral efficiency (SE) of this PSC HetNet by apply cell range expansion (CRE) to UABSs and mitigating the inter-cell interference arising in the HetNet by applying 3GPP Release-10 enhanced intercell interference coordination (eICIC) and 3GPP Release-11 further-enhanced inter-cell interference coordination (FeICIC). Through Monte-Carlo simulations, we compare the system-wide 5th percentile SE when UABSs are deployed on a hexagonal grid and when their locations are optimized using a genetic algorithm, while also jointly optimizing the CRE and the intercell interference coordination parameters. Our results show that at optimized UABS locations, reduced power subframes (FeICIC) defined in 3GPP Release-11 can provide considerably better 5th percentile SE than the 3GPP Release-10 with almost blank subframes (eICIC).

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“…Regardless, the maximum allowable path-loss when 50% and 97.5% of the MBSs are destroyed is 225 dB as shown in Fig. 3 [36].…”

Section: A Path Loss Modelmentioning

confidence: 97%

Exploiting LTE-Advanced HetNets and FeICIC for UAV-Assisted Public Safety Communications

et al. 2018

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“…However, by using the cell range expansion (CRE) technique defined in 3GPP Release 8, UABSs can associate a large number of UEs by offloading traffic from MBSs. A negative effect of CRE includes increased interference in the downlink on cell-edge UEs or the UEs in CRE region of the UABS, which is addressed by using ICIC techniques in LTE and LTE-Advanced [14]- [16]. 3GPP Release-10 introduced a time-domain based enhanced ICIC (eICIC).…”

Section: System Modelmentioning

confidence: 99%

UAV assisted public safety communications with LTE-Advanced HetNets and FeICIC

Kumbhar

Singh

Güvenç

2017

2017 IEEE 28th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC)

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Establishing a reliable communication infrastructure at an emergency site is a crucial task for mission-critical and real-time public safety communications (PSC). To this end, use of unmanned aerial vehicles (UAVs) has recently received extensive interest for PSC to establish reliable connectivity in a heterogeneous network (HetNet) environment. These UAVs can be deployed as unmanned aerial base stations (UABSs) as part of the HetNet infrastructure. In this article, we explore the role of agile UABSs in LTE-Advanced HetNets by applying 3GPP Release-11 further-enhanced inter-cell interference coordination (FeICIC) and cell range expansion (CRE) techniques. Through simulations, we compare the system-wide 5th percentile spectral efficiency (SE) when UABSs are deployed in a hexagonal grid and when their locations are optimized using a genetic algorithm, while also jointly optimizing the CRE and the FeICIC parameters. Our simulation results show that at optimized UABS locations, the 3GPP Release-11 FeICIC with reduced power subframes can provide considerably better 5th percentile SE than the 3GPP Release-10 with almost blank subframes.

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“…In addition to frequency domain IC (FIC) approaches, there are also time domain IC (TIC) approaches. Here, the almost blank subframe (ABS) approach is a TIC approach that allows a spectrum to be time shared [14,15]. The "aggressor" cells (cells causing interference) will mute certain subframes so that the victim cells (cells being interfered with) can serve their UE in those subframes.…”

Section: Introductionmentioning

confidence: 99%

Interference coordination for millimeter wave communications in 5G networks for performance optimization

Wang

Weitzen

Bayat

et al. 2019

J Wireless Com Network

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To address the increasing data rate demands for future wireless networks, a dense deployment of base stations or access points is the most promising approach; however, doing so may cause high intercell interference (ICI). Numerous interference coordination (IC) approaches have been proposed to reduce ICI. Conducting 5G communication on millimeter wave (mmWave) bands is more complex because of its higher propagation losses and greater attenuation variance, all of which depend on environment change. Massive antenna arrays with beamforming techniques can be used to overcome high propagation loss, reduce interference, deliver performance gains of coordination without a high overhead, and deliver high network capacity with multiplex transmitters. The central challenge of a massive antenna array that uses beamforming techniques is coordinating the users and beams for each transmitter within a large network. To address this challenge, we propose a novel two-level beamforming coordination approach that partitions a large network into clusters. At the intracluster level, this approach performs intracluster coordination similar to the user selection algorithms in a multiuser multiple input and multiple output (MU-MIMO); doing this maximizes the utility function or minimizes the signal-to-interference-plus-noise ratio (SINR) function within a cluster. A dynamic time domain IC approach is employed at the intercluster level, collecting interference information for cluster-edge user equipment (UE) and allocating the UE dynamically among the clusters to reduce the intercluster interference for a switched-beam system (SBS). Simulation results show that the proposed two-level IC approach achieves a higher edge user performance or cell capacity than with the current uncoordinated/coordinated approaches.

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An Overview on Interference Management in 3GPP LTE-Advanced Heterogeneous Networks

Abstract: The

Cited by 33 publications

References 19 publications

Exploiting LTE-Advanced HetNets and FeICIC for UAV-Assisted Public Safety Communications

Exploiting LTE-Advanced HetNets and FeICIC for UAV-Assisted Public Safety Communications

UAV assisted public safety communications with LTE-Advanced HetNets and FeICIC

Interference coordination for millimeter wave communications in 5G networks for performance optimization

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