| Abstract | U prvom dijelu diplomskog rada detaljno su obrađene teme 4G, 5G i Shannon-Hartley-ev teorem.
U kontekstu 4G mreže, analizirana je arhitektura mreže, slojevi protokola E-UTRAN i struktura
kanala. Nakon toga slijedi opis radijskog sučelja 4G, u kojem su razmatrani dinamičko
prilagođavanje parametara veze, raspoređivanje resursa, emitiranje i prijem signala, tehnike
višestrukog pristupa, uzroci oštećenja primljenog signala i upravljanje greškama. Također su
navedeni i objašnjeni OFDM, OFDMA i SC-FDMA te prijenos signala primjenom višestrukih
antena. Nadalje, analizirana je arhitektura 5G mreže, skup 5G protokola, razlika između
samostalnih i nesamostalnih 5G mreža te raslojavanje mreže. Obrađen je Shannon-Hartley-ev
teorem i Shannon-ova granica, te je analiziran kapacitet LTE mreže. U drugom dijelu rada
prikazani su rezultati mjerenja u 4G i 5G mrežama mobilnog uređaja opremljenog TEMS Pocket
alatom. Analiza rezultata mjerenja provedena u TEMS Discovery pokazala je da u načelu
propusnost raste kako raste SINR, ali da postoji veliki raspon vrijednosti propusnosti za isti SINR
što se može objasniti dinamičkom podjelom resursa na veći broj korisnika unutar jedne ćelije. |
| Abstract (english) | In the first part of the master's thesis, topics such as 4G, 5G, and the Shannon-Hartley theorem
were extensively discussed. In the context of 4G networks, the network architecture, E-UTRAN
protocol layers, and channel structure were analyzed. Following that is a description of the 4G
radio interface, which covers dynamic parameter adaptation, resource allocation, signal
transmission and reception, multiple access techniques, causes of received signal impairment, and
error management. Additionally, OFDM, OFDMA, and SC-FDMA were mentioned and
explained, along with signal transmission using multiple antennas. Furthermore, the architecture
of 5G networks, the set of 5G protocols, differences between standalone and non-standalone 5G
networks, and network slicing were analyzed. The Shannon-Hartley theorem and Shannon's limit
were discussed, along with an analysis of LTE network capacity. In the second part of the thesis,
measurement results in 4G and 5G networks using a mobile device equipped with the TEMS
Pocket tool were presented. The analysis of measurement results conducted in TEMS Discovery
showed that, in principle, throughput increases as SINR (Signal-to-Interference-plus-Noise Ratio)
increases. However, there is a wide range of throughput values for the same SINR, which can be
explained by the dynamic allocation of resources to a larger number of users within one cell. |
