Tsegamlak Terefe

Addis Ababa University Addis Ababa Institute of Technology

Mobile data consumption is rapidly growing following the ever-increasing bandwidth-hungry applications and improvements in network data rates. With the anticipated 5G right at the corner, operators are focusing on load-aware network dimensioning, optimization, and management, where traffic volume prediction plays a critical role. To this end, sever...

The estimation of an optimal time series average has been studied for over three decades. The process is mainly challenging due to temporal distortion. Previous approaches mostly addressed this challenge by using alignment algorithms such as Dynamic Time Warping (DTW). However, the quadratic computational complexity of DTW and its inability to alig...

In today’s data-driven world, time series forecasting is one of the intensively investigated temporal data mining technique. In practice, there are a range of forecasting techniques that are proven to be efficient at capturing different aspect of an input. For instance, classic linear forecasting models such as Seasonal Auto-Regressive Integrated M...

Time series averages are one key input to temporal data mining techniques such as classification, clustering, forecasting, etc. In practice, the optimality of estimated averages often impacts the performance of such temporal data mining techniques. Practically, an estimated average is presumed to be optimal if it minimizes the discrepancy between i...

Ethiopia is one of the African countries that has a range of local languages which have a written form. In recent years, interests have raised to better understand the statistical properties of some of the predominantly spoken and written local languages in the context of their efficient transmission (storage) in digital communication systems or st...

The widespread deployment of cellular networks has improved communication access, driving economic growth and enhancing social connections across diverse regions. Base Transceiver Stations (BTSs), are foundational to mobile networks but are vulnerable to power failures, disrupting service delivery and causing user inconvenience. This paper proposes...

The ubiquitous deployment of Fourth-generation (4G) and Fifth-generation (5G) networks, while expanding user connectivity over a larger geographic area, presents significant challenges for mobile network management. The surge in connected devices increase cell congestion, while user mobility, fading, and interference further deteriorate channel qua...

Widespread deployment of spectrally efficient mobile networks, advancements in mobile devices, and proliferation of attractive applications has led to an exponential increase in mobile data traffic. Mobile Network Operators (MNOs) benefit from the associated revenue generation while putting efforts to meet customers’ expectations of delivered servi...

The radio spectrum is a finite and scarce resource needed to transport data generated by existing and emerging wireless mobile networks and services. As the demand for wireless services is increasing, operators look for ways to efficiently utilize their assigned spectrum. While operators do regularly perform spectrum occupancy measurement using an...

Afan Oromo is the language of the Oromo people, the largest ethnolinguistic group of Ethiopia. Written Afan Oromo uses Latin alphabet and, the letters in the alphabet are represented with ASCII-8 or UTF-8 encodings. Moreover, the language uses gemination, and long vowels are represented by double letters. From information theoretic perspective, thi...

Ethio-Telecom, the sole telecom service provider in Ethiopia, is expanding its mobile network infrastructures to reach its target of over 100 million subscribers in the next few years. As a result of this expansion and with the introduction of new services a considerable amount of electronic information (eg. E-mail, Short Message Service (SMS), etc...