Abstract
Package-based services are affected by different network parameters and conditions that can deteriorate the quality of the transmitted services, especially those that are provided in real time. In this paper, result of an undergraduate research project, the bases for the construction of a QoS model are defined for a video call on an IMS network, specifying the most adequate parameters to estimate its QoS, the infrastructure used, and the tests developed. The results indicate the possibility of improving the QoS by applying the horizontal scaling technique over the IMS Core of the network since, in the vertical scalability, no major improvements were observed when increasing the physical resources of the virtual machines where the Core IMS was installed. Also, the bandwidth that complies the conditions of the quality parameters such as packet loss, delay, and jitter, to provide a good quality video call service is 640 kbps.
Highlights
The demand of the telecommunication services grows constantly and it requires that the networks supporting them are convergent and manageable (Nemati, Singhvi, Kara, & El Barachi, 2014)
Most of the telecommunication systems are migrating towards the so-called virtualized networks to take advantage of the benefits related to performance, portability, flexibility, and mainly cost reduction; further, the ease in the convergence with different telecommunication services such as multimedia and VoIP sessions is another benefit of the convergence
The quality of a video-call is sensible to the packet loss and the delays in transmission due to the real-time interaction between the users; it is necessary to follow an adequate methodology that permits the measurement of the implemented QoS in a virtualized network environment
Summary
The demand of the telecommunication services grows constantly and it requires that the networks supporting them are convergent and manageable (Nemati, Singhvi, Kara, & El Barachi, 2014). Most of the telecommunication systems are migrating towards the so-called virtualized networks to take advantage of the benefits related to performance, portability, flexibility, and mainly cost reduction; further, the ease in the convergence with different telecommunication services such as multimedia and VoIP sessions is another benefit of the convergence These virtualized networks should guarantee adequate quality of service [QoS] levels for the different types of services being transported within the network (Blandón et al, 2010). A first approach to the topic indicates that there is not a well-established model to measure the quality of service in a video-call service over a virtualized network due to different factors such as the lack of standardization, the introduction of new technologies, and the lack of studies of this service in the IMS architecture For this reason, one of the objectives of the work described in this document is to analyze the parameters that allow to measure the quality of that service in an IMS virtualized network, plus to examine the possible study cases in the network
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