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With the emergence of Augmented Reality (AR) services in a broad range of application scenarios, the interplay of (compressed) content as delivered and quality as experienced by the user becomes increasingly important. While significant research efforts have uncovered interplays for traditional (opaque) media consumption scenarios, applications in augmented vision scenarios pose significant challenges...
Internet users and businesses are increasingly using online social networks (OSN) to drive audience traffic and increase their popularity. In order to boost social presence, OSN users need to increase the visibility and reach of their online profile, like — Facebook likes, Twitter followers, Instagram comments and Yelp reviews. For example, an increase in Twitter followers not only improves the audience...
To effectively utilize storage space of edge streaming media servers, cache policies are being studied. Unlike traditional work that focused on hit ratio and overall system bandwidth cost, this paper recognize different significance of users and propose the concept of caching utility as a new metric to evaluate caching strategies. A user based caching algorithm, USCS, involving differentiated service...
The present paper focuses on the implementation and validation of audiovisual content, quality evaluation approaches in mediated learning. The main aim of the work is to identify and describe the mechanisms that the attributes of source content (and its encoding properties) influence the learning process and the involved emotional aspects in terms of Quality of Experience and Learning (QoE & QoL)...
In order to evaluate the efficacy of new research approaches as well as existing systems for management of end user service sessions, it is necessary to set up controlled sessions in a realistic, measurable, and repeatable manner. While service delivery clients support automation of end user sessions and expose mechanisms for retrieval of end user service experience and context, there is no single...
Immersive, end-to-end applications using mixed multimedia data pose new requirements to the underlying network architecture. These requirements are related to two distinct categories of content delivery. Starting from the overlaying principles of the Future Internet Architecture, the network overlay principles and the Content Delivery Network approach we define our proposed architecture based on two...
For delivering multimedia services over (wireless) networks it is important that the mechanisms which negotiate and optimize content delivery under resource constraints take into account user perceived quality in order to improve user satisfaction. Within the scope of the IP Multimedia Subsystem (IMS) architecture a novel application server may be added which handles multi-user multi-flow Quality...
Service Level Objectives (SLOs) - the core of a Service Level Agreement (SLA) - reflect major Quality-of-Service (QoS) requirements of customers on a service for a given price. SLOs need to be updated, if those requirements change. This leads to an update of the SLO auditing implementation. However, in many existing implementations, efforts are required to adapt to SLO changes, and even more efforts...
This paper proposes an architecture to provide seamless reporting over heterogeneous networks while focusing on the End-to-End information exchange and Quality of Experience analysis. For this purpose, it is presented a reporting architecture based on IEEE 802.21, where the reports are seamless exchanged through new extended IEEE 802.21 messages. This approach, besides saving on overhead of service...
We study the design of media streaming applications in the presence of multiple heterogeneous wireless access methods with different throughputs and costs. Our objective is to analytically characterize the trade-off between the usage cost and the Quality of user Experience (QoE), which is represented by the probability of interruption in media playback and the initial waiting time. We model each access...
Network impairments are unpredictable and highly destructive to the perceptual quality of media content in the IPTV content distribution networks. As a result the existing network QoS based assessment methodologies are not adequate for the IPTV QoE assessment which determines the overall acceptability of a service as perceived by the end user. A discrete perceptual impact evaluation quality assessment...
Quality of Experience (QoE) has recently gained recognition for being an important determinant of the success of new technologies. Despite the growing interest in QoE, research into this area is still fragmented. Similar - but separate - efforts are being carried out in technical as well as user oriented research domains, which are rarely communicating with each other. In this paper, we take a multidisciplinary...
Necessity of application of quality factors of sensation for assessment of IPTV system is confirmed. Ranking and analytical comparison of existing QoE metrics for IPTV systems is carried on. Requirement of development of a new mathematical model of QoE metrics is shown.
The continuous growth in both commercial and public network traffic with various quality-of-service (QoS) requirements is calling for better service than the Internet's best effort mechanism. One of the challenging issues is to predict the overall behavior of aggregate network traffic. While network traffic characterization has been studied extensively due to its importance in network scheduling and...
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