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Raftopoulou, M. (author), Litjens, R. (author), van Mieghem, P. (author)In this paper, we focus on the link density in random geometric graphs (RGGs) with a distance-based connection function. After deriving the link density in D dimensions, we focus on the two-dimensional (2D) and three-dimensional (3D) space and show that the link density is accurately approximated by the Fréchet distribution, for any rectangular...article 2022
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Anbalagan, S.N. (author), Litjens, R. (author), Das, K. (author), Chiumento, A. (author), Havinga, A, (author), van den Berg, H. (author)With increasing network complexity, intelligent mechanisms to efficiently achieve the required quality of service of wireless-enabled applications are being developed, especially for industrial environments due to the onset of the fourth industrial revolution. In this paper, the potential benefits of wireless channel quality prediction for two...conference paper 2021
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- Kizhakkekundil, S. (author), Morais, J. (author), Braam, S. (author), Litjens, R. (author) conference paper 2021
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- Arora, A. (author), Dimitrovski, T. (author), Litjens, R. (author), Zhang, H. (author) conference paper 2021
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Pijnappel, T.R. (author), van den Berg, J.L. (author), Borst, S.C. (author), Litjens, R. (author)Drone base stations can help safeguard coverage and provide capacity relief when cellular networks are under stress. Examples of such stress scenarios are events with massive crowds or network outages. In this paper we focus on a disaster scenario with emergence of a traffic hotspot, where agile drone positioning and load management is a...conference paper 2021
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Braam, S. (author), Litjens, R. (author), Smulders, P. (author), Ijntema, W. (author)We present a simulation-based assessment of the performance potential of distributed MIMO (D-MIMO), multi-user MIMO (MU-MIMO) and particularly the combined D/MU-MIMO operation, for which we extend previously published scheduling and beamforming principles. The assessment study reveals that, when optimizing average user throughput performance, D...conference paper 2020
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Raftopoulou, M. (author), Jorguseski, L. (author), Litjens, R. (author)We design and assess novel random access (RA) procedures for use in 5G radio access networks in support of machine-type applications requiring Ultra-Reliable Low-Latency Communications (URLLC). In a simulation-based performance assessment the proposed RA procedures are compared against LTE Cat-M1 (or LTE-M), the current LTE-based access...conference paper 2019
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Nair, V. (author), Litjens, R. (author), Zhang, H. (author)A suitability assessment and performance optimisation is presented of narrowband Internet of Things (NB-IoT) cellular technology for use in smart energy distribution networks. The focus is on the reliable and timely delivery of outage restoration and management (ORM) messages at the event of a local or regional power outage. Both the cellular NB...article 2019
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Nair, V. (author), Litjens, R. (author), Zhang, H. (author)In this paper, we assess the suitability of NB-IoT (Narrowband Internet of Things) cellular technology for smart grid applications, concentrating on the reliable and timely delivery of Outage Restoration & Management (ORM) messages at the event of a local or regional power outage. Using system-level simulations modelling of both the cellular NB...conference paper 2018
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Martinez, A.M. (author), Trichias, K. (author), Litjens, R. (author)Active Antenna Systems (AAS) technology is one of several advanced features that enable a mobile network operator to cost-efficiently increase its network capacity to cope with the exponential mobile data traffic growth and the ever more demanding performance requirements. AAS can be exploited to perform e.g. Virtual Sectorisation (ViS), i.e....conference paper 2016
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Lohmuller, S. (author), Eisenblatter, A. (author), Frenzel, C. (author), Gotz, D. (author), Hahn, S. (author), Kurner, T. (author), Litjens, R. (author), Lobinger, A. (author), Sas, B. (author), Schmelz, L.C. (author), Turke, U. (author)A Self-Organising Network (SON) represents an approach where the optimisation of a mobile radio network is automated through a set of independently operating SON functions. These SON functions, however, require to be configured in order to allow for an optimised network performance with respect to technical objectives defined by the network...conference paper 2015
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Trichias, K. (author), Litjens, R. (author), Tall, A. (author), Altman, Z. (author), Ramachandra, P. (author)Vertical Sectorisation (VS) is a feature that exploits the capabilities of Active Antenna Systems (AAS) to improve service performance and network capacity, by splitting a single cell into an inner and outer sector. The attained gains primarily depend on the suitable and timely (de)activation of VS in response to the observed/estimated traffic...conference paper 2015
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Litjens, R. (author), Toh, Y. (author), Zhang, H. (author), Blume, O. (author)We assess the energy efficiency of mobile networks in 2020, and compare it with a 2010 baseline. A comprehensive assessment approach is taken, considering all relevant scenario aspects such as data traffic growth, hardware evolutions, mobile network deployments and operations including network sharing and the dynamic switching on/off of radio...conference paper 2014
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Trichias, K. (author), Litjens, R. (author), Tall, A. (author), Altman, Z. (author), Ramachandra, P. (author)The advent of Active Antenna Systems has provided new ways and features for increasing the capacity of mobile networks in order to cope with the ever increasing traffic demand. One such feature is the vertical sectorisation (VS) technique where a cell is divided into an inner and an outer sector by using a second downtilted beam from one antenna...conference paper 2014
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Litjens, R. (author), Hendriks, R.W. (author)Mobile network operators are currently preparing the introduction of QoS differentiation mechanisms in their 3G networks, as a means to support service-specific quality requirements, to enable the offering of distinct subscription forms and/or to enhance the resource efficiency and hence network capacity. In this paper we quantify the attainable...article 2014
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Janssen, T. (author), Litjens, R. (author), Sowerby, K.W. (author)Driven by a combination of flat lining revenues and an explosive growth in the mobile data traffic and hence the need for network resources, mobile operators consider infrastructure-and spectrum sharing as a means to reduce operational costs. We develop and apply an assessment approach to quantify the benefits associated with spectrum sharing in...conference paper 2014
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Schmelz, L.C. (author), Eisenblätter, A. (author), Hahn, S. (author), Kürner, T. (author), Litjens, R. (author), Lobinger, A. (author), Lohmüller, S. (author), Sas, B. (author), Türke, U. (author)The demonstrator shows a self-management system for heterogeneous mobile wireless networks that uses context-specific and weighted Key Performance Indicator (KPI) target values defined by the operator to automatically and autonomously configure and control the operation of Self-Organising Network (SON) functions such that they contribute to...conference paper 2014
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Eisenblätter, A. (author), Conzalez Rodríguez, B. (author), Gunnarsson, F. (author), Kürner, T. (author), Litjens, R. (author), Sas, B. (author), Sayrac, B. (author), Schmelz, L.C. (author), Willcock, C. (author)Future radio access networks will require new self-management solutions to handle the increasing operational complexity caused by multi-technology and multi-layer deployments. Current networks already include stand-alone SON (Self-Organizing Networks) solutions, but these are not sufficient to properly handle the networks of tomorrow. In this...conference paper 2013
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Litjens, R. (author), Gunnarsson, F. (author), Sayrac, B. (author), Spaey, K. (author), Willcock, C. (author), Eisenblätter, A. (author), Rodríguez, B.G. (author), Kürner, T. (author)The development of self-management solutions for (multi-technology, multi-layer) mobile communication networks is driven by their increasing operational complexity. Initial stand-alone SON (Self-Organizing Networks) solutions are already available, but are not sufficient to handle the networks of tomorrow. In this paper we present our approach...conference paper 2013
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Litjens, R. (author), Zhang, H. (author), Noppen, I. (author), Yu, L. (author), Karipidis, E. (author), Börner, K. (author)We assess the system-level performance of nonorthogonal spectrum sharing achieved via maximum sum-rate (SR), Nash bargaining (NB), and zero-forcing (ZF) transmit beamforming techniques. A look-up table based physical layer abstraction and radio resource management mechanisms (including packet scheduling) are proposed and incorporated in system...conference paper 2013