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This paper proposes a call admission control (CAC) policy for contemporary multimedia satellite networks that are operated at frequencies beyond 10 GHz. During rain events, signals that are transmitted/received at these frequencies are likely to be degraded due to rain attenuation. Therefore, an adaptive modulation and coding (AMC) technique is developed to mitigate the deleterious effect of rain...
In this work, we consider the problem of automatic content retrieval (ACR) using joint audio-video fingerprints. We focus on how to balance the query accuracy and the size of fingerprint, and how to allocate the fingerprint bits to video and audio frames to maximize the query accuracy. By introducing a novel concept called coverage, which is highly correlated to the query accuracy, we are able to...
Recent multimedia studies show that the Quality-of-Experience(QoE) more accurately represents the user's level of satisfaction than the Quality-of-Service (QoS) does. Long Term Evolution (LTE) Multimedia Broadcast Multicast Operation (MBMS), via MBMS Operation On-Demand (MooD), enables dynamic resource configuration of multicast flows. In order to maximize the QoE of all users in a LTE MooD system...
The distributed caching management enabled wireless networking technology can greatly improve the data storage and transmission efficiency of wireless users and correspondingly the users' quality of experience (QoE). How to alleviate the pressure on network access while ensuring the content consistency is still a challenge. In this paper, we investigate the vehicular users oriented caching management...
This paper describes experimental study of Quality of Experience of compressed audiovisual materials for bandwidth-limited multimedia systems. A new method of bit rate reduction in such systems is proposed in this paper. It is based on a cross-modal audiovisual interaction-based model of Quality of Experience and takes into account that optimal audio and video codec parameters in bandwidth-limited...
In this paper, we propose a novel advanced multirate design for evolved Multimedia Multicast/Broadcast Service (eMBMS) in fourth generation (4G) Long-Term Evolution (LTE)/LTE-Advanced (LTE-A) networks. The proposed design provides: i) reliability, based on random network coded (RNC) transmission, and ii) efficiency, obtained by optimized rate allocation across multi-rate RNC streams. The paper provides...
In this paper, we consider scalable video multicast to LTE-A user groups. We focus on the problem in accommodating the varying channel conditions amongst group members to adaptively select modulation schemes that meet the desired QoS objectives for the bitstream layers. We envision a fair provisioning of the base layer to ensure baseline quality to all users and an opportunistic provisioning of the...
Future cognitive radio broadband wireless networks are expected to support a variety of communication services with diverse quality-of-service (QoS) requirements. Multimedia applications such as broadband voice transmission and real-time video streaming are very delay-sensitive and need guaranteed throughput. On the other hand, applications like file transfer and email services are relatively delay...
Frame skipping function in video transcoding emerges as a significant research area for the telecommunication and multimedia applications. In this paper, a novel frame skipping transcoding scheme is proposed, which meets the needs of fixed frame rate, good encoding quality, and small frame rate fluctuation. Based on the proposed sliding window architecture, the transcoder can achieve an even distribution...
Portable devices are increasingly running complex applications wireless multimedia while at the same time facing stringent implementation constraints. UWB devices are candidates for a wide range of applications. The potential UWB devices will be of short range, portable and capable of delivering high bit rate. Multi-band orthogonal frequency division multiplexing (MB-OFDM) being a special case of...
Enhanced Multimedia Broadcast/Multicast Service (EMBMS) is a new function defined in 3GPP specification, which supports download delivery and streaming delivery to group users in LTE mobile networks. In 3GPP Release 8 specification, the EMBMS transmission is classified into single-cell transmission and MBSFN (Multicast Broadcast Single Frequency Network transmission). In MBSFN, the statistical multiplexing...
Different multimedia applications have different characteristics and properties which determine specific quality of service (QoS). For QoS purposes the application functions may interact with the resource management function or rely on the service control functions. The optimal utilization of network resources implies cross-layer approach to resource management that allows third party application...
Because of bursty high data rate and delay sensitive nature of high quality multimedia application, the resource allocation in wireless network to meet its quality of service (QoS) has become the most challenging and interesting issue. Orthogonal Frequency Division Multiple Access (OFDMA) employing adaptive channel allocation technique can support these requirement while increasing the system capacity...
The role of multimedia application in our life has dramatically increased in the last few years. Multimedia streaming is more significant than downloading ways in multimedia applications from bandwidth and delay reasons. Multimedia contents are in nature distributed in nodes of grid. Streaming media are still not well resolved in grid environment. This thesis proposes an agent-based framework for...
Current methods for multiplexing video streams often rely on identifying the relative complexity of the video streams to improve the combined overall quality. In such methods, not all the videos benefit from the multiplexing process. Typically, the quality of high motion videos is improved at the expense of reduction in the quality of low motion videos. In our approach, we use a competitive equilibrium...
The quality layers concept is proposed and adopted in the JSVM in order to ensure an optimal adaptation in a rate-distortion sense. In this paper it is extended to multiview case for scalable coding of stereo videos. Rate-visual-distortion optimized rate allocation among the views is necessary for efficient transport of 3DTV data over the Internet. This paper addresses a standard compatible approach...
The E-MBMS (evolved multimedia broadcast and multicast service) in 3GPP LTE is characterized by the MBSFN (MBMS single frequency network) operation. The MBSFN operation requires that the identical signals are transmitted from all the base stations at the same time and in the same frequency. Such requirement implies some restrictions in the resource allocation and may increase the needed bandwidth...
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