Monitoring QoE on Digital Terrestrial TV : A comprehensive approach
Rafael Sotelo, Juan Pablo Garella, Eduardo Grampín, Javier Baliosian, José Joskowicz, Gustavo Guimerans, María Simon
BMSB 2016 : 11th International Symposium on Broadband Multimedia Systems and Broadcasting , Nara, Japon, 1-3 jun, page 1--6- 2016
Research group(s):  (unspecified)
Department(s):  Telecomunicaciones
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Abstract

Broadcasters and regulators are very interested in measuring the different factors that compose the quality of a TV transmitted signal in its service area. Traditional approaches are based on vehicles equipped with expensive measuring instruments. But the ideal would be to measure continuously in a set of representative points spread in the area, and with a common time base, which is not possible with this traditional method. In recent years some systems that can centralise and store measurements were proposed [1, 2, 3]. The article reports the conception and implementation of a technological platform for monitoring the signal quality of the ISDB-Tb Digital TV signal in a constant, decentralized, automatic, and unified manner. Design constraints were that the system should be non expensive, based on standard elements and scalable. It aims to give systematic and auditable measurements, in contrast and as a complement of those that are carried on demand or due to users complaints. It can detect signal attenuation, losses or coding problems, some of them before they are noticeable by the users. These characteristics may be used to avoid bad user experiences and therefore to improve the acceptation of the Digital Television, speeding up its adoption. The work was backed by the Uruguayan telecommunications regulatory body (URSEC) and the national direction of telecommunications (DINATEL). It is expected also to provide useful data to the broadcasters. The concept of service quality is very large: the system is conceived to measure a wide range of factors, from purely physical and objective, as the received power, the Modulation Error Rate (MER) or Bit Error Rate (BER), to the perceived video and audio quality, which are subject to human appreciation. All of them are reflected in the final result, which is the Quality of Experience (QoE). The architecture of the system is shown in Figure 1 and consists in a set of reception nodes, located in the claimed coverage area, and a central processing and recording unit. They are communicated by high speed internet. One of the nodes is located in a very good reception site and is taken as a signal reference. It allows to analyse the coding quality and to implement Full Reference quality estimation models. In an optimal situation, this reference node could be substituted by the original emitted signal, provided by the broadcaster via optical fiber or other virtually error free transmission system.

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» Rafael Sotelo
» Juan Pablo Garella
» Eduardo Grampín
» Javier Baliosian
» José Joskowicz
» Gustavo Guimerans
» María Simon