Mobility Management for Femtocells in LTE-Advanced: Key Aspects and Survey of Handover Decision Algorithms

Xenakis, Dionysis; Passas, Nikos; Merakos, Lazaros; Verikoukis, Christos

doi:10.1109/surv.2013.060313.00152

Cited by 196 publications

(141 citation statements)

References 91 publications

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“…Although there is plenty of valuable research on handovers in RF networks [146]- [148], handover techniques conveived for VLC-based HetNets have remained to a large extent hitherto unexplored. In [149], the horizontal handovers between multiple VLC APs were studied in both non-overlapping spotlighting and in overlapping uniform lighting scenarios.…”

Section: A Vlc-aided Heterogeneous Networkmentioning

confidence: 99%

Optimization of Visible-Light Optical Wireless Systems: Network-Centric Versus User-Centric Designs

Zhang

Hanzo

2018

IEEE Commun. Surv. Tutorials

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Abstract-In order to counteract the explosive escalation of wireless tele-traffic, the communication spectrum has been gradually expanded from the conventional radio frequency (RF) band to the optical wireless (OW) domain. By integrating the classic RF band relying on diverse radio techniques and optical bands, the next-generation heterogeneous networks (HetNets) are expected to offer a potential solution for supporting the ever-increasing wireless tele-traffic. Owing to its abundant unlicensed spectral resources, visible light communications (VLC) combined with advanced illumination constitute a competent candidate for complementing the existing RF networks. Although the advantages of VLC are multi-fold, some challenges arise when incorporating VLC into the classic RF HetNet environments, which may require new system architectures. The user-centric (UC) design principle for VLC environments constitutes a novel and competitive design paradigm for the super dense multi-tier cell combinations of HetNets. The UC concept may be expected to become one of the disruptive techniques to be used in the forthcoming fifthgeneration era. This paper provides a comprehensive survey of visible-light-aided OW systems with special emphasis on the design and optimization of VLC networks, where the radically new UC design philosophy is reviewed. Finally, design guidelines are provided for VLC systems.

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Section: A Vlc-aided Heterogeneous Networkmentioning

confidence: 99%

Optimization of Visible-Light Optical Wireless Systems: Network-Centric Versus User-Centric Designs

Zhang

Hanzo

2018

IEEE Commun. Surv. Tutorials

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“…In the presence of small cells, the short transmit-receive range brings the time horizon for cell HO closer to the one for Radio Resource Management (RRM), significantly increasing the processing and signaling overheads required for cell HO. HO decision for small cells typically involves the utilization of an enriched set of parameters on the network status [3], e.g., received signal strength (RSS), user speed, and interference. On the other hand, HO execution for small cells necessitates additional signaling to support the discovery of small cells (proximity indication), their unique identification (Physical Cell Identifier (PCI) resolution), and the employment of access control [2].…”

Section: Cell Handover For Small Cells and Open Issuesmentioning

confidence: 99%

“…Even though some of the existing proposals conduct mathematical analysis, the assumption of simplistic network layouts raises questions about their scalability in real-life systems. Besides, recent trends for performance evaluation of multi-tier networks, such as the Small Cell Forum evaluation methodology or stochastic geometry [3], should be integral part of future proposals for HO decision in a small cell network.…”

Section: Design Guidelines and Best Practicesmentioning

confidence: 99%

“…LTE-A supports exciting new capabilities towards improving the cell HO process, such as optimization of cellspecific HO parameters, employment of cell and UE signal measurements, and mobility estimation. The utilization of such features during the HO decision stage is a key enabler for avoiding frequent yet unnecessary HOs in the small cell network and alleviating the negative impact of cross-tier interference on the Signal to Interference plus Noise Ratio (SINR) performance [3]. Since HO decision is outside the scope of the LTE-A Standard, the employment of intelligent HO decisions in the presence of small cells can be a big competitive advantage for an operator.…”

Section: Introductionmentioning

confidence: 99%

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Handover decision for small cells: Algorithms, lessons learned and simulation study

et al. 2016

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More and more cellular network operators enable the unplanned deployment of small-sized cellular stations by the end users into the predominant macrocellular network layout. This increases the spatial capacity of the cellular system and reduces the costs for installing, managing, and operating the radio access network. However, the impact of such an unplanned network densification on the robustness of cell handover (HO) still remains unclear and needs to be studied. For this purpose, in this paper we highlight the key aspects of the cell HO process in the presence of small cells and identify the main issues that affect its robustness. We summarize lessons learned from the rich literature on HO decision algorithms for small cells, and present an algorithm for alleviating interference in the cellular uplink while prolonging the battery lifetime of the user terminal. Based on the evaluation methodology of the Small Cell Forum, we conduct a comprehensive system-level simulation study to validate the accuracy of our findings and provide valuable insights on the key performance trade-offs inherent to the HO decision for small cells . 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 Abstract -More and more cellular network operators enable the unplanned deployment of small-sized cellular stations by the end users into the predominant macrocellular network layout. This increases the spatial capacity of the cellular system and reduces the costs for installing, managing, and operating the radio access network. However, the impact of such an unplanned network densification on the robustness of cell handover (HO) still remains unclear and needs to be studied. For this purpose, in this paper we highlight the key aspects of the cell HO process in the presence of small cells and identify the main issues that affect its robustness. We summarize lessons learned from the rich literature on HO decision algorithms for small cells, and present an algorithm for alleviating interference in the cellular uplink while prolonging the battery lifetime of the user terminal. Based on the evaluation methodology of the Small Cell Forum, we conduct a comprehensive system-level simulation study to validate the accuracy of our findings and provide valuable insights on the key performance trade-offs inherent to the HO decision for small cells.

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“…In order to reduce these network failures, different algorithms for RATS, which are found in literature, can be implemented in such networks [4], depending on different criteria. Handover decision criteria including advantages and disadvantages of their use can be found in [5].…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of Radio Access Technology Selection Algorithms in Heterogeneous 4G Networks

Porjazoski¹,

Todorovska²,

Latkoski³

et al. 2016

International Journal of Advanced Research in Computer and Comm

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Abstract:In this paper is given a performance analysis of Radio Access Technology selection (RATS) algorithmsfor Long Term Evolution -Advanced (LTE-A) heterogeneous networks. The relevant performances are analysed using atwo dimensional Markov Model. Two RATSalgotithms are applyed:the first oneis simple, based only on the availability of the small cell connection, while the second one is based on two more criteria: user mobility and network load. The performance analysis shows that better results are obtained using the features provided in LTE-A, compared to the ones in previous technologies. The RATS algorithm influences the system performances as well. The results show that using the RATS algorithm based on two more criteria provides better perfotmances than the simpler one.

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Mobility Management for Femtocells in LTE-Advanced: Key Aspects and Survey of Handover Decision Algorithms

Cited by 196 publications

References 91 publications

Optimization of Visible-Light Optical Wireless Systems: Network-Centric Versus User-Centric Designs

Optimization of Visible-Light Optical Wireless Systems: Network-Centric Versus User-Centric Designs

Handover decision for small cells: Algorithms, lessons learned and simulation study

Performance Analysis of Radio Access Technology Selection Algorithms in Heterogeneous 4G Networks

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