# Survey on Quality of Experience Evaluation for Cloud-Based Interactive Applications
## 2 Related Works  
In this survey, we focus on identifying the strategies that can be used to achieve adequate QoE monitoring in CIAs and explore new possibilities to improve current proposals. To the best of our knowledge, no previous surveys about QoE in CIAs exist because of the relative novelty of this type of deployment and the rapidly changing landscape of cloud technologies. There are only surveys with limited scopes related to QoS in cloud computing, interactive applications, general QoE, or QoE for specific services. Some studies in the literature analysed aspects of cloud computing, such as pricing, scalability, and architecture. Among the surveys that addressed generic QoE, some were barely descriptive and focused mainly on aspects such as architecture and provisioning [20] but they were not specific to CIAs. [PERSON] et al. [20] attempted to provide a tutorial and survey of QoE management solutions in general multimedia services. However, the paper skipped over QoE quantification. It did not consider the particularities of a CIA and only devoted two paragraphs to QoE measurement. Furthermore, the authors only listed two QoE quantification proposals focused on obtaining QoS-specific network parameters, without explaining the procedures the proposals follow. Other proposals addressed the evaluation of QoE quantification methodologies but with a strong focus on a particular service. Within this group, some surveys focused on a specific field, such as mobile cloud computing [21; 22] or multimedia services [23; 24]. [PERSON] et al. [21] reviewed the mechanisms of offloading computation in mobile cloud  
Figure 1: Structure of this survey. computing environments. However, they only dedicated one paragraph to the idea that service administrators should monitor its QoE. They provided a list of works dedicated to assessing QoE in mobile cloud computing. However, the authors did not describe these proposals, nor did they mention what metrics they provided or used, or to what type of services they applied. [PERSON] et al. [23] discussed concepts related to QoE management of networked multimedia services and addressed the implications of the emergence of new services. The authors outlined some proposals for QoE modelling. However, the scope of the paper was very broad and encompassed proposals for any type of multimedia service, regardless of whether the services analysed were CIAs or not, thus ignoring their particularities. [PERSON] et al. [22] provided a recent review of quality of experience (QoE) in the broader domain of cloud computing. The study compiled recent articles from the past few years but did not focus specifically on interactive applications deployed in the cloud. It did not address the specificities of these services, as it evaluated only a few proposals related to cloud gaming. The authors did not delve into a detailed analysis of the evaluated proposals, such as the input metrics required for processing. However, they emphasised the QoE metrics provided in the literature. [PERSON] et al. [24] provided an extensive review of contemporary signal-based audio and video perceptual quality assessment methods. The authors conducted experiments utilising subjective quality scores to analyse and compare the efficacy of these methods. While the metrics they investigated hold promise for evaluating two crucial dimensions of QoE in CIAs--visual and audio quality--they notably omitted state-of-the-art proposals tailored specifically to CIAs. Instead, their focus remained exclusively on visual and audio aspects applicable to any service, irrespective of its interactivity or deployment in the cloud. Additionally, for the majority of the metrics assessed, the direct relationship with QoE was not delineated, with the analysis predominantly confined to QoS considerations. Other surveys focused exclusively on remote processing or cloud gaming [25; 26; 27; 28; 29]. [PERSON] et al.