Silent Calls – Causes and Measurements

• Autorzy: Baran K. , Cegłowski P. , Kula S.
• Języki publikacji: EN

Abstrakty

EN

The quality of telephone services is very important from either operator or subscriber point of view. One of the negative phenomenon which affects quality of telephone services is lack of speech signal during a call. This situation occurs relatively frequently in mobile telephony, and is called silent call (SC). Lack of speech signal can occur only once or many times during the call, and degrade connection quality. In this paper, an analysis of this phenomenon is presented. The research base are the results of measurements mobile network one of operators in Trójmiasto a large urban area consisting of three cities: Gdańsk, Gdynia, and Sopot. To estimate impact of silent calls on speech quality, mean opinion score index was calculated using POLQA algorithm.

Słowa kluczowe

EN

key performance indicators; silent calls; speech signal analysis

• Wydawca: Instytut Łączności - Państwowy Instytut Badawczy
• Czasopismo: Journal of Telecommunications and Information Technology
• Rocznik: 2015
• Tom: nr 1
• Strony: 20--22
• Opis fizyczny: Bibliogr. 7 poz., rys.

Twórcy

autor

Baran K.

• Faculty of Electronics and Information Technology, Warsaw University of Technology, Nowowiejska st 15/19, 00-665 Warsaw, Poland

autor

Cegłowski P.

• Faculty of Electronics and Information Technology, Warsaw University of Technology, Nowowiejska st 15/19, 00-665 Warsaw, Poland

autor

Kula S.

• Faculty of Electronics and Information Technology, Warsaw University of Technology, Nowowiejska st 15/19, 00-665 Warsaw, Poland

Bibliografia

• [1] M. Sauter, From GSM to LTE: An Introduction to Mobile Networks and Mobile Broadband. London: Wiley, 2010.
• [2] Measurement methodology [Online]. Available: http://www.syspab.eu/?en benchmarking-of-mobile-operators,44
• [3] NQDI, SwissQual’s post-processing system [Online]. Available: http://www.swissqual.com/index.php/systems/nqdi.html
• [4] Silan Software [Online]. Available: https://github.com/x42/silan
• [5] K. Baran and P. Cegłowski, “Research on the phenomenon of silent all in networks mobile operators”, Institute of Telecommunications, Warsaw University of Technology, Warsaw 2013.
• [6] POLQA algorithm [Online]. Available: http://www.polqa.info/
• [7] A. Janicki and B. Książek, “Packet loss concealment algorithm for VoIP transmission in unreliable networks” [Online]. Available: www.tele.pw.edu.pl/ajanicki/docs/aj-missi08.pdf