Ultra-Dense Networks: Survey of State of the Art and Future Directions

Yu, Wei; Xu, Hansong; Zhang, Hanlin; Griffith, David; Golmie, Nada

doi:10.1109/icccn.2016.7568592

Cited by 90 publications

(34 citation statements)

References 57 publications

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“…Nowadays, small cell is a term to refer to compact lowpower BSs (e.g., microcells, picocells, or femtocells) and other macrocellular network extensions (e.g., relays, remote radio heads) that are deployed to enhance coverage and capacity in homes, enterprise environments, underserved areas, and other indoor and outdoor traffic hotspots [6]. This exponential data traffic growth is already setting an imperative requirement for Ultra Dense Networks (UDNs), identified as a key enabler for the 5th generation (5G) [1,5,[7][8][9]. Indeed, 5G targets the operation in higher 2 Mobile Information Systems frequencies together with smaller cell sizes to achieve the envisioned extreme Mobile Broadband (xMBB) [1,7].…”

Section: Introductionmentioning

confidence: 99%

A Planning and Optimization Framework for Ultra Dense Cellular Deployments

González

Mutafungwa

Haile

et al. 2017

Mobile Information Systems

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To accommodate the ever-expanding wireless data traffic volumes, mobile network operators are complementing their macrocellular networks by deploying low-power base stations (or small cells) to offload traffic from congested macrocells and to reuse spectrum. To that end, Ultra Dense Network (UDN) deployments provide means to aggressively reuse spectrum, thus providing significant enhancements in terms of system capacity. However, these deployments entail several challenges, including the increased complexity in network planning and optimization. In this paper, we propose a versatile optimization framework for planning UDN deployments. The planning and optimization framework is underpinned by metrics that consider scalability in terms of number of users, cost of densification, and fairness. The proposed methodology is evaluated using a real-world UDN planning case. The numerical results expose a number of interesting insights, including the impact of different bandwidth allocation strategies and spatial service demand distribution on the performance of various network topologies. Specifically, we provide a performance comparison of the optimized UDN topologies versus random (unplanned), regular grid, and heuristically derived UDN topologies. This comparison further underlines the need for flexible network planning and optimization frameworks as different operator performance metrics of interest may require different radio access networks configurations.

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Section: Introductionmentioning

confidence: 99%

A Planning and Optimization Framework for Ultra Dense Cellular Deployments

González

Mutafungwa

Haile

et al. 2017

Mobile Information Systems

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“…Some authors have investigated various issues relating to UDNs individually [12], [20], [23], [47], [54]- [56]. A summary of the existing survey papers on UDNs is given in table 1 based on the issues discussed, research challenges and suggested techniques.…”

Section: B Review Of Existing Survey Papers On Intelligent Managemenmentioning

confidence: 99%

“…Moreover, in their survey, the EE of the ultra-dense small cell deployments is analysed, indicating the benefits of energy harvesting approaches to make the small cell deployments more energy-efficient. The authors in [54], review existing research efforts toward addressing the challenges of interference, mobility and RRM in UDNs. Similarly, in [55], the challenges, methodologies, and directions of user-centric UDNs for 5G are highlighted.…”

Section: B Review Of Existing Survey Papers On Intelligent Managemenmentioning

confidence: 99%

“…Different from [12], [20], [23], [47], [54]- [56], which study UDNs individually, in this paper, we aim to fill the research gaps found in previous surveys by presenting a comprehensive survey on the recent advances and research challenges on the combination of UDNs and other 5G enabling technologies. In addition, various proposals on intelligent management techniques and backhaul solutions for the mixture of UDNs and other enabling technologies in the last five years are presented.…”

Section: Contributions and Organisationmentioning

confidence: 99%

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Combination of Ultra-Dense Networks and Other 5G Enabling Technologies: A Survey

2020

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Recently, to address the astonishing capacity requirement of 5G, researchers are investigating the possibility of combining different technologies with ultra-dense networks (UDNs). However, the ultradense deployment of small cells in the coverage area of conventional macrocells known as UDNs introduces new technical challenges such as severe interference, unfairness in radio resource sharing, unnecessary handover, a significant increase in energy consumption, and degraded quality-of-service (QoS). To overcome these challenges and achieve the performance requirements in 5G, there is a need to combine UDNs with other 5G enabling technologies and then, design intelligent management techniques for better performance of the overall networks. Hence, in this paper, we present a comprehensive survey on different generations of wireless networks, 5G new radio (NR) standards, 5G enabling technologies and the importance of combining UDNs with other 5G technologies. Also, we present an extensive overview of the recent advances and research challenges in intelligent management techniques and backhaul solutions in the last five years for the combination of UDNs and other enabling technologies that offers the visions of 5G. We summarise the mathematical tools widely exploited in solving these problems and the performance metrics used to evaluate the intelligent management algorithms. Moreover, we classify various intelligent management algorithms according to the adopted enabling technologies, benefits, challenges addressed, mathematical tools and performance metrics used. Finally, we summarise the open research challenges, provide design guidelines and potential research directions for the development of intelligent management techniques and backhaul solutions for the combination of UDNs and other 5G technologies. INDEX TERMS Macrocells, small cells, ultra-dense networks, QoS.

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“…M2M communication [9], also called machine type communication (MTC), enables universal connectivity between devices with little or no human intervention. It is also specified by the 5GPPP (5G public private partnership) that the requirements of M2M communications must be met in 5G HetNets to support Internet-of-Things applications [15,34]. Though M2M devices barely move in most use cases, such as data collection in e-Health, remote surveillance in public safety, etc., most M2M devices in intelligent transportation and tracking systems do move.…”

Section: Use Casesmentioning

confidence: 99%

A Cross-Domain Optimization Scheme for MANET Communications in Heterogeneous Networks

Wu¹,

Yu²,

Fang³

et al. 2017

EAI Endorsed Transactions on Wireless Spectrum

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In this paper, we propose a cross-domain optimization (CDO) scheme, which optimizes the MANET topology and enables communication between multiple MANETs via LTE. Particularly, we first deploy a gateway to the center of gravity of all nodes in each MANET so that the network topology is optimized. Thus, the aggregation cost of intra-MANET traffic in the gateway is improved. Likewise, we then deploy an eNodeB in the center of gravity of all gateways to establish communication connections between multiple MANETs via LTE. Then, the aggregation cost of inter-MANET traffic at eNodeBs can be largely reduced because of the minimization of the distances between eNodeBs and gateways, along with a significant performance improvement of inter-MANET communications owing to the superiority of LTE. Vis extensive simulations, we validate the effectiveness of our proposed scheme. Our experimental results demonstrate that the CDO scheme can greatly improve network performance. Finally, we discuss some other issues.

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Ultra-Dense Networks: Survey of State of the Art and Future Directions

Cited by 90 publications

References 57 publications

A Planning and Optimization Framework for Ultra Dense Cellular Deployments

A Planning and Optimization Framework for Ultra Dense Cellular Deployments

Combination of Ultra-Dense Networks and Other 5G Enabling Technologies: A Survey

A Cross-Domain Optimization Scheme for MANET Communications in Heterogeneous Networks

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