Performance Analysis of Small Cells' Deployment under Imperfect Traffic Hotspot Localization

Heterogeneous Networks (HetNets), long been considered in operators' roadmaps for macrocells' network improvements, still continue to attract interest for 5G network deployments. Understanding the efficiency of small cell deployment in the presence of traffic hotspots can further draw operators' attention to this feature. In this context, we evaluate the impact of imperfect small cell positioning on the network performances. We show that the latter is mainly impacted by the position of the hotspot within the cell: in case the hotspot is near the macrocell, even a perfect positioning of the small cell will not yield improved performance due to the interference coming from the macrocell. In the case where the hotspot is located far enough from the macrocell, even a large error in small cell positioning would still be beneficial in offloading traffic from the congested macrocell.Comment: This article is already published in IEEE Global Communications Conference (GLOBECOM) 201

Offloading traffic hotspots using moving small cells

In this paper, the concept of moving small cells in mobile networks is presented and evaluated taking into account the dynamics of the system. We consider a small cell moving according to a Manhattan mobility model which is the case when the small cell is deployed on the top of a bus following a predefined trajectory in areas which are generally crowded. Taking into account the distribution of user locations, we study the dynamic level considering a queuing model composed of multi-class Processor Sharing queues. Macro and small cells are assumed to be operating in the same bandwidth. Consequently, they are coupled due to the mutual interferences generated by each cell to the other. Our results show that deploying moving small cells could be an efficient solution to offload traffic hotspots.Comment: This article is already published in IEEE ICC conference 2016, Kuala Lumpur, Wireless networks symposiu

A QUALITATIVE STUDY OF MIDDLE SCHOOL SCIENCE TEACHERS’ PERCEPTIONS OF THE TRANSITION TO ONLINE INSTRUCTION DURING THE COVID-19 PANDEMIC

The purpose of this study was to explore the unique lived experiences of four middle school science teachers from North Carolina and South Carolina during and following the transition from in-person to online instruction due to the COVID-19 pandemic. Four predominant themes were identified from individual, semi-structured interviews of the teachers: technology change; organizational change; changes in curricula, delivery, and student interaction; and career and personal changes. The teachers in this study described the challenges and opportunities experienced during the rapid transition in March 2020 to virtual teaching and learning. The teachers’ lived experiences seamlessly aligned with the stages of change discussed by Lewin (1947) and other researchers (Bridges & Bridges, 2017; Kotter, 2012; Lewin, 1947; Page & Schoder, 2019). The teachers’ comments and experiences provided a unique perspective into the technical, personal, psychological, social, and cognitive shifts during unplanned, rapid, and disruptive change. The results of this study provided evidence of the teachers’ resilience and their ability to persevere in times of crisis