Multimedia services over mobile networks are subject to multiple factors that affect the Quality of Experience (QoE) perceived by users. In a Long Term Evolution (LTE) multimedia broadcast service, these factors are initial delay, technical quality of multimedia content, and service disruptions. However, there is a lack of QoE models to enable QoE measurement. We propose to use video Mean Opinion Score (vMOS) as a new and objective QoE model that is in the process of standardization, and we show how it can be applied to LTE multimedia broadcast services for QoE assessment. The results obtained are useful to better understand the impact of several service parameters on perceived quality. By applying this assessment methodology, it is possible to determine the most adequate service parameters for a specific LTE broadcast deployment.

Interactive television (iTV) is the convergence of television with digital media technologies. iTV must be treated as a unique medium with its own set of constraints and opportunities. A set of principles to follow, when designing iTV applications, is presented. Heuristics to be applied when evaluating iTV applicationspsila usability is described.

Currently, 4G mobile communication systems are supported by the 3GPP standard. In view of the significant increase in mobile data traffic, it is necessary to characterize it to improve the performance of current wireless networks. Indeed, video transmission and video streaming are fundamental assets for the upcoming smart cities and urban environments. Due to the high costs of deploying a real LTE system, emulation systems that consider real operating conditions emerge as a successful alternative. On the other hand, many studies with LTE simulations and emulations do not present information of basic adjustment parameters like the propagation model, nor of validation of the results with real conditions. This paper shows the validation with an ANOVA statistical analysis of an LTE emulation system developed in NS-3 for the live video streaming service. For the validation, different QoS parameters and real conditions have been used. Also, two protocols, namely RTMP and RTSP, have been tested. It is demonstrated that the emulation scenario is appropriate to characterize the traffic that will later allow to carry out a proper performance analysis of the service and technology under study.

Software product lines aim in having a common platform from which several similar products can be derived. The elements of the platform are called assets and they are managed in an asset base being part of the product line infrastructure. Assets can include own developments, open source or third-party software modules, as well as design and project documents. In the context of the European-wide project FAMILIES we concentrated on techniques used to populate the asset base by recovering assets from existing systems. We present an approach on how to incorporate existing assets into the product line infrastructure. Thereby we explicitly distinguish the asset origins and the different information sources available. The incorporation is a quality-driven process that is backed up by a set of reverse engineering techniques to evaluate the asset's internal quality. The quality assessment of an asset is the critical measurement for industrial development organizations in order to incorporate assets into their product line infrastructure