Network coding meets multimedia: a review

While every network node only relays messages in a traditional communication system, the recent network coding (NC) paradigm proposes to implement simple in-network processing with packet combinations in the nodes. NC extends the concept of "encoding" a message beyond source coding (for compression) and channel coding (for protection against errors and losses). It has been shown to increase network throughput compared to traditional networks implementation, to reduce delay and to provide robustness to transmission errors and network dynamics. These features are so appealing for multimedia applications that they have spurred a large research effort towards the development of multimedia-specific NC techniques. This paper reviews the recent work in NC for multimedia applications and focuses on the techniques that fill the gap between NC theory and practical applications. It outlines the benefits of NC and presents the open challenges in this area. The paper initially focuses on multimedia-specific aspects of network coding, in particular delay, in-network error control, and mediaspecific error control. These aspects permit to handle varying network conditions as well as client heterogeneity, which are critical to the design and deployment of multimedia systems. After introducing these general concepts, the paper reviews in detail two applications that lend themselves naturally to NC via the cooperation and broadcast models, namely peer-to-peer multimedia streaming and wireless networkin

Data aggregation in wireless sensor networks

Energy efficiency is an important metric in resource constrained wireless sensor networks (WSN). Multiple approaches such as duty cycling, energy optimal scheduling, energy aware routing and data aggregation can be availed to reduce energy consumption throughout the network. This thesis addresses the data aggregation during routing since the energy expended in transmitting a single data bit is several orders of magnitude higher than it is required for a single 32 bit computation. Therefore, in the first paper, a novel nonlinear adaptive pulse coded modulation-based compression (NADPCMC) scheme is proposed for data aggregation. A rigorous analytical development of the proposed scheme is presented by using Lyapunov theory. Satisfactory performance of the proposed scheme is demonstrated when compared to the available compression schemes in NS-2 environment through several data sets. Data aggregation is achieved by iteratively applying the proposed compression scheme at the cluster heads. The second paper on the other hand deals with the hardware verification of the proposed data aggregation scheme in the presence of a Multi-interface Multi-Channel Routing Protocol (MMCR). Since sensor nodes are equipped with radios that can operate on multiple non-interfering channels, bandwidth availability on each channel is used to determine the appropriate channel for data transmission, thus increasing the throughput. MMCR uses a metric defined by throughput, end-to-end delay and energy utilization to select Multi-Point Relay (MPR) nodes to forward data packets in each channel while minimizing packet losses due to interference. Further, the proposed compression and aggregation are performed to further improve the energy savings and network lifetime --Abstract, page iv

A PERVERSION-RESISTANT ROUTING FOR VIDEO DELAY IN WIRELESS NETWORKS

From the user perspective, reducing the amount of video distortion is crucial. Popular link-quality-based routing metrics don't take into account dependence over the links of the path consequently, they are able to cause video flows to converge onto a couple of pathways and, thus, cause high video distortion. Traditional routing metrics created for wireless systems are application-agnostic. Within this paper, we think about a wireless network in which the application flows contain video traffic. Particularly, the various amounts of encoding make reference to, either information encoded individually, within the situation of I-frames, or encoding in accordance with the data encoded within other frames, out of the box the situation for P- and B-frames. We discover via simulations and test bed experiments our protocol is efficient in lessening video distortion and minimizing the consumer experience degradation. To take into account the evolution from the video frame loss process, we construct an analytical framework to, first, understand and, second, measure the impact from the wireless network on video distortion. Because of the complexity from the optimization problem, an inherited-formula-based heuristic approach can be used to compute the routes. Our approach differs not just in route we model video distortion, but additionally on the truth that we concentrate on LC that is popular in programs today.  The framework enables us to formulate a routing insurance policy for minimizing distortion, according to which we design a protocol for routing video traffic

AN ALTERATION-IMPERVIOUS DEFEATING BACKGROUND FOR CIRCULATION HIP WIRELESS MULTIHOP SYSTEMS

A large-different research was present on routing computations for wireless random with meshes systems. Previous produces routing meant for video communications will spotlight on multiple description coding. The schemes of multipath routing are believed to be to obtain greater quality of video transfer. Inside our work we consider wireless network in which the application flows includes video traffic and introduce an analytical structure that captures impact of routing on finish-to-finish video features regarding distortion. The expansion will facilitate computation of routes that are best regarding achieving of least distortion. To think about growth of the whole process of video frame loss, analytical structure recognizes and, assesses impact of wireless network above video distortion. The recommended system will grant us to make a routing policy meant for minimizing distortion that's which we goal a procedure for routing video traffic. Our proposal is video quality of user-perceived is considerably enhanced by means of comprised of application needs, especially video distortion that's possessed a flow. Our physiques of routing are enhanced for moving videos above wireless systems by means of minimum video distortion

A FRAME RESIST JAMMING GUIDANCE FOR VIDEO TRAFFIC IN WIRELESS MULTIHOP NETWORKS

A large-different research was present on routing calculations for wireless random with meshes systems. Previous creates routing meant for video communications will spotlight on multiple description coding. The schemes of multipath routing are believed to be to obtain greater quality of video transfer. Inside our work we consider wireless network in which the application flows includes video traffic and introduce an analytical structure that captures impact of routing on finish-to-finish video features regarding distortion. The expansion will facilitate computation of routes that are best regarding achieving of least distortion. To think about growth of the whole process of video frame loss, analytical structure recognizes and, assesses impact of wireless network above video distortion. The recommended system will grant us to make a routing policy meant for minimizing distortion that's which we goal a procedure for routing video traffic. Our proposal is video quality of user-perceived is considerably enhanced by means of comprising application needs, especially video distortion that's possessed a flow. Our physiques of routing are enhanced for moving videos above wireless systems by means of minimum video distortion

Towards video streaming in IoT environments: vehicular communication perspective

Multimedia oriented Internet of Things (IoT) enables pervasive and real-time communication of video, audio and image data among devices in an immediate surroundings. Today's vehicles have the capability of supporting real time multimedia acquisition. Vehicles with high illuminating infrared cameras and customized sensors can communicate with other on-road devices using dedicated short-range communication (DSRC) and 5G enabled communication technologies. Real time incidence of both urban and highway vehicular traffic environment can be captured and transmitted using vehicle-to-vehicle and vehicle-to-infrastructure communication modes. Video streaming in vehicular IoT (VSV-IoT) environments is in growing stage with several challenges that need to be addressed ranging from limited resources in IoT devices, intermittent connection in vehicular networks, heterogeneous devices, dynamism and scalability in video encoding, bandwidth underutilization in video delivery, and attaining application-precise quality of service in video streaming. In this context, this paper presents a comprehensive review on video streaming in IoT environments focusing on vehicular communication perspective. Specifically, significance of video streaming in vehicular IoT environments is highlighted focusing on integration of vehicular communication with 5G enabled IoT technologies, and smart city oriented application areas for VSV-IoT. A taxonomy is presented for the classification of related literature on video streaming in vehicular network environments. Following the taxonomy, critical review of literature is performed focusing on major functional model, strengths and weaknesses. Metrics for video streaming in vehicular IoT environments are derived and comparatively analyzed in terms of their usage and evaluation capabilities. Open research challenges in VSV-IoT are identified as future directions of research in the area. The survey would benefit both IoT and vehicle industry practitioners and researchers, in terms of augmenting understanding of vehicular video streaming and its IoT related trends and issues

Mobile Ad-Hoc Networks

Being infrastructure-less and without central administration control, wireless ad-hoc networking is playing a more and more important role in extending the coverage of traditional wireless infrastructure (cellular networks, wireless LAN, etc). This book includes state-of-the-art techniques and solutions for wireless ad-hoc networks. It focuses on the following topics in ad-hoc networks: quality-of-service and video communication, routing protocol and cross-layer design. A few interesting problems about security and delay-tolerant networks are also discussed. This book is targeted to provide network engineers and researchers with design guidelines for large scale wireless ad hoc networks

Distributed video coding for wireless video sensor networks: a review of the state-of-the-art architectures

Distributed video coding (DVC) is a relatively new video coding architecture originated from two fundamental theorems namely, Slepian–Wolf and Wyner–Ziv. Recent research developments have made DVC attractive for applications in the emerging domain of wireless video sensor networks (WVSNs). This paper reviews the state-of-the-art DVC architectures with a focus on understanding their opportunities and gaps in addressing the operational requirements and application needs of WVSNs