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Browsing by Author "Lysko, Albert A"

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4G RAN infrastructure sharing by 5G virtualized mobile network operators: A tutorial

Author: Mamushiane, Lusani ; Mboweni, Lawrence S ; Kobo, Hlabishi ; Mudumbe, Mduduzi J ; Mwangama, J ; Lysko, Albert A Date: Sep 2021 Active radio access network (RAN) infrastructure sharing has emerged as a promising solution for efficient spectrum utilization, capital and operational cost savings, improved MVNO penetration rates and lower broadband retail prices in both ... Read more
5G network slice resource overbooking: An opportunity for telcos to boost their revenue

Author: Mamushiane, Lusani ; Mwangama, J ; Lysko, Albert A ; Kobo, Hlabishi I Date: Aug 2022 The global impact of COVID-19 has been unprecedented, with over-the-top (OTT) services consumption growing at a staggering rate. While OTT does consume revenue-generating data, OTT services are gradually substituting the traditional primary ... Read more
Analysis of uniformity in steering capability of an ESPAR antenna

Author: Ebrahim, Rozeena ; Mthethwa, Nosipho B ; Lysko, Albert A Date: Nov 2022 This paper looks at design considerations for an Electronically Steerable Parasitic Array Radiator (ESPAR) antenna suitable for inexpensive large-scale wireless network technologies. This can help address the demand for a cheaper, simpler, ... Read more
Antenna research directions for 6G: A brief overview through sampling literature

Author: Olwal, TO ; Chuku, PN ; Lysko, Albert A Date: Mar 2021 Antennas are a critical component in any wireless link. The significance of their role continues to grow, together with the rise of machine-to-machine (M2M) communications and telecommunications starting to move from the fourth generation ... Read more
Antenna research directions for 6G: A brief overview through sampling literature

Author: Olwal, TO ; Chuku, PN ; Lysko, Albert A Date: Mar 2021 Antennas are a critical component in any wireless link. The significance of their role continues to grow, together with the rise of machine-to-machine (M2M) communications and telecommunications starting to move from the fourth generation ... Read more
Beam steering for circular switched parasitic arrays using a combinational approach

Author: Mofolo, ROM ; Lysko, Albert A ; Olwal, TO ; Clarke, WA Date: Sep 2011 In this paper, the authors present a method of electronic beam steering for circular switched parasitic array (SPA) antennas. In circular SPA antennas, one achieves azimuth beam steering by open-circuiting and short-circuiting different ... Read more
Calculation of radiation field integrals for higher-order basis functions in conical thin wire MoM formulation

Author: Lysko, Albert A Date: Jul 2008 An efficient method of integration for far field calculations is derived. The method applies to the integrals arising from calculation of far field pattern with higher-order polynomial basis functions and moment method. The integral under ... Read more
Classification of SDN distributed controller approaches: a brief overview

Author: Nkosi, M ; Lysko, Albert A ; Ravhuanzwo, L ; Nyandeni, T ; Engelbrecht, A Date: Nov 2016 Software defined networking offers a capability of separating control plane from data plane. The control plane is the key component of a network which ensures smooth management and operation of the entire network. However, network’s resiliency ... Read more
A comparative analysis of urban and rural broadband penetration and access trends in South Africa

Author: Ngwenya, SO ; Heymann, R ; Swart, TG ; Lysko, Albert A Date: Jul 2023 This paper considers the differences between rural and urban access to Information and Communication Technology (ICT) through non-intrusive research methodologies that are deemed effective in obtaining the relevant information required to ... Read more
A comparative evaluation of the performance of popular SDN controllers

Author: Mamushiane, Lusani ; Lysko, Albert A ; Dlamini, Sabelo V Date: Apr 2018 Software Defined Networking (SDN) is an architecture that decouples the routing intelligence from the forwarding functions, using an entity called 'controller'. It is paramount that the performance of the controller is thoroughly understood ... Read more
Comparison of MANET routing protocols using a scaled indoor wireless grid

Author: Johnson, DL ; Lysko, Albert A Date: Apr 2008 Predicting the performance of ad-hoc networking protocols has typically been performed by making use of software based simulation tools. Experimental study and validation of such predictions is vital to obtaining more realistic results, but ... Read more
Comparison of metaheuristic algorithms for interface-constrained channel assignment in a hybrid Dynamic Spectrum Access – Wi-Fi infrastructure WMN

Author: Zlobinsky, N ; Johnson, DL ; Mishra, AK ; Lysko, Albert A Date: Feb 2022 In this work, we evaluate the application of four different metaheuristic optimisation algorithms for solving the channel assignment problem in a multi-radio multi-channel Wireless Mesh Network (WMN) using Dynamic Spectrum Access (DSA). The ... Read more
Comparison of the modelled maximum wireless link distance for TVWS and Wi Fi within South African regulatory constraints: Which technology wins and in which scenarios?

Author: Lysko, Albert A ; Burger, Chris R ; Hagopian, E Date: Aug 2019 The work compares Wi-Fi and television white space (TVWS) technologies for practical broadband communication links, specifically in rural areas. The paper starts with an overview of advantages and limitations of Wi-Fi and TVWS in terms of ... Read more
Considerations for coexistence: DVB-T2 broadcasting and LTE basestations in 700/800 MHz bands in South Africa

Author: Lysko, Albert A ; Dludla, Angeline G Date: Nov 2018 This work considers coexistence of DVB-T2 and LTE in South Africa. The protection ratios for protecting DVB T2 transmission against interference from LTE are calculated based to the DVB-T2 specifications used in South Africa. An approach is ... Read more
Considering the connectivity options for a smart water management system deployment

Author: Lysko, Albert A ; Ngcama, Lwando ; Shingwenyana, Rhulani K ; Ramotsoela, D Date: Dec 2022 Smart water utility management is gaining strong momentum as it can help to identify leaks and control the water flow, level and pressure. The latter can be used to reduce leaks, reduce bursts and prolong the life of pipes. All these factors ... Read more
Controller placement optimization for Software Defined Wide Area Networks (SDWAN)

Author: Mamushiane, Lusani ; Mwangama, J ; Lysko, Albert A Date: Mar 2021 Software Defined Networking (SDN) has emerged as a promising solution to revolutionize network deployment, operations and economic growth. This paradigm aims to address management and configuration complexities in legacy networks so as to ... Read more
A correlation between RSSI and height in UHF band and comparison of geolocation spectrum database view of TVWS

Author: Maliwatu, R ; Lysko, Albert A ; Johnson, David L ; Hadzic, S Date: Dec 2016 An investigation into the Received Signal Strength Indicator (RSSI) dependency on receiver antenna height in UHF band is conducted. The results show a high correlation between RSSI and height on channels with high signal strength. There is ... Read more
Deploying a stable 5G SA testbed using srsRAN and Open5GS: UE integration and troubleshooting towards network slicing

Author: Mamushiane, Lusani ; Lysko, Albert A ; Kobo, Hlabishi I ; Mwangama, J Date: Aug 2023 Field trials and experimentation are crucial for accelerating the adoption of standalone (SA) 5G in Africa. Traditionally, only network operators and vendors had the opportunity for practical experimentation due to proprietary systems and ... Read more
Design of energy conscious antenna system for WLAN frequency band

Author: Bembe, MJ ; Lysko, Albert A ; Nyandeni, TC ; Clark, W Date: Aug 2009 The electronically steerable parasitic array radiator (ESPAR) antenna system is configured with one feed radiating element and N-parasitic radiating elements. The radiation pattern is electronically controlled by means of the variable devices ... Read more
Design of RS232-powered controller for switched parasitic array antenna

Author: Mofolo, MOR ; Lysko, Albert A Date: Sep 2013 It is often convenient to power up peripheral devices directly from the host device interface, without a need for additional and/or external power supply. In this paper we present a design of the RS232-powered controller for electronically ... Read more

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