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Dynamic Adaptive Streaming over HTTP (DASH) is referred to as a multimedia streaming standard to deliver high quality multimedia content over the Internet using conventional HTTP Web servers. As a fundamental feature, it enables automatic switching of quality levels according to network conditions, user requirements, and expectations. Currently, the proposed adaptation schemes for HTTP streaming mostly...
In current cellular networks, schedulers allocate wireless channel resources to users based on short-term moving averages of the channel gain and of the queuing state. Using only such short-term information, schedulers ignore the user's service history in previous cells and, thus, cannot meet long-term Quality of Service (QoS) guarantees when users traverse cells with varying load and capacity. We...
Video transmission over long term evolution (LTE) networks is studied. The use of distributed antenna systems (DAS) is proposed to enhance the video quality of experience (QoE). Real time video streaming over both the uplink (UL) and downlink (DL) directions is investigated. LTE dynamic resource allocation is taken into account, and several types of DAS deployments are analyzed and compared. Simulation...
In recent years, multimedia applications and services, especially video, have suffered a sudden growth. Today, the video display is not limited to the traditional areas of movies and television, but thanks to the evolution of video distribution for packet networks such as the Internet, and the emergence of numerous and various video display devices, you can access these applications in different environments...
The recent Long-Term Evolution (LTE) standard, thanks to the provision of high data rates, will enable future immersive and interactive multimedia applications over wireless. In this paper, we study the performance of 2D and 3D video transmission over LTE networks. The LTE standard bandwidth ranges are considered in order to explore the impact of the LTE bandwidth scalability on the transmission of...
Network congestion has become a critical issue for resource constrained Wireless Sensor Networks (WSNs), especially for Wireless Multimedia Sensor Networks (WMSNs) where large volume of multimedia data is transmitted through the network. If the traffic load is greater than the available capacity of the sensor network, congestion occurs and it causes buffer overflow, packet drop, deterioration of network...
The increasing amount of online video content offered by network operators to mobile users opens the door to new challenging optimizations. In a mobile network video applications can be served through several video delivery paths, resulting in different video quality experienced by the end user. The mobile operator is in charge of guiding the video services to keep a target video quality and to optimize...
In this paper we present some contemporary examples of research-oriented as well as commercial content delivery networks (CDN)s. We discuss how both types of CDNs complement each other in tackling the posed technical and commercial challenges. We also show which performance metrics such as quality of experience (QoE) and time to first byte (TTFB) best capture the dynamics of traffic and services in...
The development of real-time quality estimator schemes for emerging Internet videos with different content types remains a significant challenge and is crucial for the success of wireless multimedia systems. However, currently in-service assessment schemes fail in capturing subjective aspects of multimedia content related to the user perception. Therefore, this paper proposes an on-the-fly parametric...
Quality of Experience (QoE) is a widely used metric reflecting the users' satisfaction of the multimedia service. This paper studies the QoE-driven resource allocation technique in the Orthogonal Frequency Division Multiplexing (OFDM) system. Different from other schemes, multiuser-multiservice scenario is taken into consideration for both power allocation and subcarrier scheduling, which is much...
Projections indicate that video will be responsible for 90% of network traffic until the end of the decade. Considering the high cost of media production and, mainly, the high consumption of network resources for applications that explore it, it will be extremely important to monitor such use, preventing against wrong or distorted views of this consumption. Within this scenario, it is necessary to...
H.264 is widely used in recently years and has achieved a significant improvement in coding efficiency. The entropy coding methods used in H.264 are CAVLC and CABAC. Although these two variable length code methods can achieve high compression, they are very sensitive to channel errors. In this paper, An iterative joint source channel decoder which combines the variable length code and low density...
In managing multimedia services, it is important to understand how network performance affects user experience. The model presented in this paper aims to estimate user perception of video quality based on defect events, which are automatically classified by machine learning techniques. The underlying principle of our model is that human experience is event-based and there is a strong correlation between...
Wireless mesh networks (WMN) enables the expansion of communication networks and broadband services. This expansion allows the use of applications like streaming multimedia in P2P (Peer-to-Peer). P2P-TV and WMNs share similar features like self-organization and decentralization in dynamic network environments and multi-hop transmission. In this context quality measurement has become essential due...
The commitment of resources may not be sufficient to ensure that multimedia applications will be guaranteed the required service quality in the network. It is important that multimedia applications ensure end-to-end service quality of media streams, considering both the networks and the end systems. In particular, it is essential to maintain a certain level of multimedia quality regardless of the...
Relying on cooperative game theory and in particular on the Nash bargaining solution (NBS), we propose in this paper a downlink scheduling strategy for scalable video transmission to multiple users over Orthogonal Frequency Division Multiple Access (OFDMA) systems, such as the recent LTE/LTE-A wireless standard. We propose a novel utility metric based on video quality to be used in conjunction with...
As cloud diversifies into different application fields, understanding and characterizing the specific workloadsand application requirements play important roles in thedesign of efficient cloud infrastructure and system softwaresupport. Video analytic is a rapidly advancing field and it iswidely used in many application domains (i.e., health, medicalcare, surveillance, and defense). To support video...
New advanced techniques must be developed to support the growth of IPTV services and to boost quality delivered to the consumers. Optimization technique is proposed for the way users access video content delivered via wide area networks. The perceived quality of service will increase because the user accesses video content temporarily stored in nearby geographic locations. Temporary storage for content...
In this paper a novel evaluation framework for measuring the performance of real-time action recognition methods is presented. The evaluation framework will extend the time-based event detection metric to model multiple distinct action classes. The proposed metric provides more accurate indications of the performance of action recognition algorithms for games and other similar applications since it...
Ensuring end-to-end video quality requires monitoring quality in real-time (in-service) and taking counter-measures in times of adverse network conditions. Such application-layer QoS assurance mechanisms require light-weight video quality metrics that can be implemented with low computational and communication overheads. In this paper, we propose a novel video quality metric for video conferencing-type...
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