2 research outputs found
Performance Evaluation of VoLTE Based on Field Measurement Data
Voice over Long-Term Evolution (VoLTE) has been witnessing a rapid deployment
by network carriers worldwide. During the phases of VoLTE deployments, carriers
would typically face challenges in understanding the factors affecting the
VoLTE performance and then optimizing it to meet or exceed the performance of
the legacy circuit switched (CS) network (i.e., 2G/3G). The main challenge of
VoLTE service quality is the LTE network optimization and the performance
aspects of the service in different LTE deployment scenarios. In this paper, we
present a detailed practical performance analysis of VoLTE based on
commercially deployed 3GPP Release-10 LTE networks. The analysis evaluates
VoLTE performance in terms of real-time transport protocol (RTP) error rate,
RTP jitter and delays, block error rate (BLER) in different radio conditions
and VoLTE voice quality in terms of mean opinion score (MOS). In addition, the
paper evaluates key VoLTE features such as RObust Header Compression (ROHC) and
transmission time interval (TTI) bundling. This paper provides guidelines for
best practices of VoLTE deployment as well as practical performance evaluation
based on field measurement data from commercial LTE networks
In Search of Lost QoS
The area of quality of service (QoS) in communications networks has been the
target of research for already several decades with tens of thousands of
published journal and conference papers. However, the practical introduction of
QoS systems in commercial networks has been limited (with a preference for
simple overprovisioning). Despite this dissonance, most influential QoS papers
do not discuss this lack of penetration or challenge any of the common
assumptions used to argue for QoS systems. So far, the few critical QoS papers
have had only a minor effect on QoS research and standardization. Therefore,
there is a serious risk that QoS will remain an academic research topic without
significant practical relevance. To help elucidate these issues, in this work,
we first perform a comprehensive review of QoS including a general overview and
an analysis of both influential and critical work from the past 30 years. We
examine properties such as citations, keywords, and author traits to show that
QoS has passed through several distinct phases with different topics while
maintaining the overall attitude towards the role and objective of QoS systems.
We then discuss QoS as a social phenomenon and in the context of current
networking standards. Finally, we propose a QoS scheme based on incentives that
avoids some of the problems identified in critical work, and we provide simple
recommendations for network operators. Overall, we hope to spark the community
to take a fresh look at QoS