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B. Krasniqi, G. Bytyqi, D. Statovci:
"VoLTE Performance Analysis and Evaluation in Real Networks";
Talk: BalkanCom 2018, Second International Balkan Conference on Communications and Networking, Podgorica, Montenegro (invited); 06-06-2018 - 06-08-2018; in: "BalkanCom 2018", Podgorica (2018), 1 - 5.

Moving voice traffic from circuit-switched domain to packet-switched domain seems to be the only rational way to improve quality of experience. Voice over Long-Term Evolution (VoLTE) is a technology that enables transmission of voice calls over LTE network by using IP Multimedia Subsystem (IMS). VoLTE is bandwidth efficient and offer better speech quality than legacy technologies such as Universal Mobile Telecommunications System (UMTS) and Global System for Mobile communication (GSM). In this paper, we analyze the impact of radio propagation conditions, codec type implementation, and mouth-to-ear delays on VoLTE service performance. In particular, we consider drive test, stationary test, and train test measurements in real VoLTE network deployments. Testing results indicate that when both end users are using VoLTE technology, the obtained speech quality is impressive compared to the case when one user is using legacy technologies (UMTS or GSM) or performing Circuit Switched Fall Back (CSFB) to legacy. Furthermore, results show that VoLTE call setup time and mouth-to-ear delays are shorter while call reliability is comparable with legacy technologies. However, the percentage of VoLTE dropped calls is high and this indicates a potential for further optimization in the current implementation of VoLTE.

VoLTE, LTE, CSFB, SRVCC, UMTS, GSM, handover

https://publik.tuwien.ac.at/files/publik_270530.pdf