Abstract
Rapidly rising demand for radio communication and the explosion in the number of mobile communications service subscribers have led to the need for optimization in the development of fifth-generation (5G) mobile communication systems. Previous studies on the development of propagation models considering a propagation environment in the existing microwave band have been mainly focused on analyzing the propagation characteristics with regard to large-scale factors such as path losses, delay propagation, and angle diffusions. In this paper, we investigated the concept of spatial and time changes ratios in the measurement of wave propagations and measured RSRP of Long Term Evolution (LTE) signals at three locations considering the time rate of 1% and 50%. We confirmed the concept of spatial and time changes rate based on the results of analyzing the signal data measured and proposed the propagation models 1 and 2 in microcell downtown. The forecast results using proposed models 1 and 2 were better than the COST231 model in both indoor and outdoor measured places. It was predicted between a time rate of 1% and 50% indoor within 400m and outdoor within 200m. In the future, we will study the propagation model of 5G mobile communication as well as the current 4G communication using artificial intelligence technology.
Highlights
Rising demand for radio communication and the explosion in the number of mobile communications service subscribers have led to the need for optimization in the development of fifth-generation (5G) mobile communication systems. 5G mobile systems will encompass frequencies from 0.5 GHz to 100 GHz [1]
Previous studies on the development of propagation models considering a propagation environment in the existing microwave band have been mainly focused on analyzing the propagation characteristics with regard to large-scale factors such as path losses, delay propagation, and angle diffusions [9,10,11,12,13]
A random location was selected for measuring the time change rates, and the reference signal receive power (RSRP), which is one of the various signals transmitted from the base station using the mobile communication Long Term Evolution (LTE) network, was measured using measurement equipment [14, 17, 18]
Summary
Rising demand for radio communication and the explosion in the number of mobile communications service subscribers have led to the need for optimization in the development of fifth-generation (5G) mobile communication systems. 5G mobile systems will encompass frequencies from 0.5 GHz to 100 GHz [1]. In terms of developments in generation mobile communication systems, performance verification of the development system is essential, for which it is necessary to estimate the exact wireless-space channel [2] This is because this channel is based on the exact model, including elements of the wireless transmission applications, such as frequency, time, space, and polarization [3,4,5,6,7,8]. We confirm the concept of spatial and time changes rates based on the results of analyzing the signal data measured. Based on these results, we propose a propagation model considering distance and frequency in microcell downtown environment.
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