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the aforementioned Recommendation ITU-T P.1320, new  by generating a shared virtual space that is geometrically
           subjective evaluation methodologies must be added, as  consistent with the physical space in which the different
           well as objective metrics for monitoring and dimensioning  participants move.
           the network.  ITU-T has already started addressing this  Subsequently, we have proposed and analyzed a network
           problem, with the analysis of QoE influencing factors for  architecture to deploy distributed reality services in a 5G and
           VR (G.1035 [48]) and AR (G.1036 [49]), as well as with  B5G network. We have described the basic quality models
           a methodology to assess the quality of immersive video  that exist in the state of the art, and we have proposed a
           (P.919 [50]). However, the subjective evaluation of immersive  way to be able to have coarse parametric models that allow
           communications systems is a significantly more complex task  improving the dimensioning of the network.
           than simply assessing the visual quality offered by the HMD.  Finally, we have analyzed the main opportunities for
           First, the ability of XR technology to elicit a sense of  standardization that arise from this technology: on the
           presence, even with much poorer visual quality than that  one hand, in the design of an interoperable system (using
           available in, say, high-definition video on a screen, makes  telephony as an example) and, on the other, in the
           it not enough to measure subjective quality-of-the-pixel.  development of subjective methodologies and objective
           It is also necessary to measure socio-emotional aspects  metrics to assess the quality of experience.
           such as the feeling of presence or the ability to improve
           empathy in communications [17].  In order to carry out          ACKNOWLEDGEMENT
           experiments that allow measuring differences in these aspects,
           more sophisticated methodologies are needed, which include  The author would like to acknowledge the whole Nokia
           interaction between several people and carrying out different  eXtended Realty Lab, as well and the Image Processing
           communication tasks [11]. The challenge ahead is being  Group (GTI) at Universidad Politécnica de Madrid, since this
           able to develop a Recommendation that is precise enough  keynote paper shows the work done jointly with researchers
           to define a set of repeatable tasks and measurements across  of both teams.  Special thanks to Marta Orduna, Carlos
           multiple labs, while also being broad and complex enough to  Cortés, Diego González-Morín, and Ester González-Sosa,
           cover many types of systems and measure various perceptual  from whom I have learnt so much in the last few years.
           and socioemotional properties.  The Immersive Media  This work has received funding from the Spanish
           Group (IMG) of the Video Quality Experts Group (VQEG)  Administration  Agency  Centro  para  el  Desarrollo
           is currently starting a project to design and validate an  Tecnológico Industrial (CDTI) under project IDI-20210977
           assessment methodology that can address this challenge for a  (IMMINENCE) as an International Technical Cooperation
           wide range of immersive communication systems.     R&D Project.
           Finally, with regard to objective quality models, the range
           of pending work is wide. Today there are no sufficiently              REFERENCES
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                          5. CONCLUSIONS
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           Throughout this paper we have explored the idea of the  social computing, pp. 1552–1566, 2015.
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