Маланчук, Є. З. та Христюк, А. О. та Загоровський, В. Н. та Malanchuk, E. Z. та Khrystіuk, A. O. та Zahorovskyi, V. N. (2018) ОСОБЛИВОСТІ ПЕРЕДАВАННЯ ГОЛОСУ В МЕРЕЖІ LTE. Вісник Національного університету водного господарства та природокористування (3(83)). с. 127-139.

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Анотація

Наведено основні результати дослідження методів передавання голосу в мережах четвертого покоління, аналіз існуючих проблем в технологіях передавання голосу, а також перевірка якості та надійності технології VoLTE у лабораторному середовищі. Запропоновано структуру пристрою. Представлено рекомендації щодо застосування технологій передавання голосу в мережах LTE, розгорнутих в Україні, оцінка існуючих технологій, що використовуються для передавання голоcу в мережах четвертого покоління, створення тестової стратегії для перевірки надійності передавання голосу в мережі LTE.

Title in English

FEATURES OF VOICE TRANSMISSION IN THE LTE NETWORK

English abstract

The main results of the research of methods of voice transmission in the fourth generation networks, the analysis of existing problems in voice transmission technologies, and also verification of quality and reliability of VoLTE technology in the laboratory environment are presented. Recommendations on the application of voice technology in LTE networks deployed in Ukraine, assessment of existing technologies used for transmitting voice over the fourth generation networks, and the creation of a test strategy for checking the reliability of voice transmission on the LTE network are presented. The appearance of VoLTE in the market has raised many open questions about the quality of already stable switching wireless services. The average call time for the VoLTE service using the IMS platform was investigated. To do this, we built an experimental layout consisting of Anritsu MD8475 base station tester and simulator, which supports testing of services, VoLTE technology and call processing for various LTE smartphones and mobile devices with high cost efficiency. On the basis of the study of the peculiarities of implementation of voice transmission in the LTE network, the following results were obtained: LTE wireless technology differs from second- and third-generation technologies with high data rates (up to 100 Mbit / s in downward direction and up to 50 Mbit / s in the upward direction) thanks to the use of Multiple Input Multiple Output (MIMO) technology, modulation schemes OFDM and increase the channel width to 20 MHz; in the fourth generation networks, the transmission of information is based solely on the use of packets, in connection with which the implementation of voice transmission in the networks of LTE becomes a problematic issue; the advantages and disadvantages of such voice transmission technologies in LTE networks are explored; during the simulation of calls in the LTE network, we investigated the average call time for a VoLTE service using the IMS platform, for this purpose a prototype model was constructed consisting of Anritsu MD8475 signal tester and simulator of the base station Anritsu MD8475, which supports testing of services, VoLTE technology and call processing for various Smartphone and LTE mobile devices with high cost-effectiveness; to simulate LTE calls in a laboratory environment, the SmartStudio MX847570A software environment, as well as the IMS Droid APP to simulate ISIM parameters and to allow non-VoLTE UEs to communicate with the IMS server and create an SIP-based VoLTE call, is used. According to the results of the measurements, it was found that the average time of voice call setup using Voice over IP via Voice over IMS is 0.079 seconds, which is tens of times lower than the time of call setup using Circuit Switched Fall-Back technology, which is currently used in Ukraine.

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