ITU-T Recommendations

Recommendation ITU-T G.1072 presents an opinion model that predicts the overall gaming quality of experience (QoE) of non-expert gamers for cloud gaming services. The model uses an impairment factor approach in which the impact of typical Internet protocol (IP) network parameters and video encoding parameters on the video and input quality is estimated. The knowledge summarized in Recommendations ITU-T G.1032 and ITU-T P.809 serves as a basis for the development of the model. The model is a network planning tool which can be used by stakeholders to manage resource allocation and to configure IP-network transmission settings such as the selection of encoding framerates, resolutions and bitrates, under the assumption that the network is prone to packet loss and latency. Depending on whether the respective stakeholder has a priori knowledge of the type of game being offered through the cloud gaming service, either a default mode, which assumes the game to be highly sensitive towards delays and frame losses as well as having high encoding complexity, or an extended mode, which uses an adjusted model coeffiecient to increase the prediction accuracy, can be used.

Corrigendum 1 provides correction for three equations. The corrections are required to avoid an undefined value for Equations 10 and 13 in case the frame loss rate is set to 0. These changes do not affect the coefficient of Equations 10 and 13. In addition, a typo was found in the coefficient d7 of Equation 12, which is updated. Equations 5, 10 and 13 are more consistent when referring to the encoding framerate in the updated version.