Measurement of Intercell Interference in LTE and Analysis of the Burstiness of Interference Pikes

Interference is a phenomenon that occurs in any wireless network, and the understanding of interference will help in developing efficient interference management techniques. This thesis focuses on a specific type of interference that is present in any cellular network, called intercell interference. Then, we analyse the burstiness of high interference events called “pikes” in the LTE network. In Chapter 2 of the thesis, we analyse three main factors that may impact the burstiness of interference pikes: these factors are car speed, mobile data traffic and track direction. We perform the measurements by changing these three main factors and analysing the statistics values. We find that car speed will impact only the time durations of pikes but not the burstiness of them. But mobile data traffic and track direction will have a substantial impact on the burstiness of interference pikes. Burstiness of interference pikes is analysed in two different environments, the urban area and rural area. In Chapters 3 and 4 of this thesis, we analyse all statistics of these interference pikes, including time durations and burstiness. This analysis is done using different values for the interference power threshold. In those two chapters, we find that increasing the threshold will always decrease the number of pikes and in most cases, it will decrease the pike durations of the pikes and increase valley durations. But the impact of the threshold value in the three burstiness measures will be different for different environments. Also, the three burstiness measures will not change following a specific function but rather in a random way. A comparison of statistics between different environments is done in Chapter 5 of this thesis. We compare results between two cities with very different urban structures, two rural areas in different countries and an urban and rural area. We find that in a city with higher population density and higher interference power interference pikes are more bursty and have a longer time duration. In a highway that passes through populated areas pikes are more bursty compared with highways that pass through unpopulated areas. In rural areas, interference pikes are more bursty and come in longer bursts compared to urban areas.
Xhemal Pengili
Masterarbeit Universität Klagenfurt 2022