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Disaster situations are a challenge for network operators because they result in an extraordinary large number of calls being opened simultaneously compared to normal operating conditions. The Quality of Service (QoS) and Quality of Experience (QoE) for the end user can be widely affected by peak loads and result in severe degradation, basically due to congestion on bottlenecks inside the network...
In Wireless Multimedia Sensor Networks (WMSNs), data fusion and collaborative in-network processing operations often require effective multimedia synchronization control. Extensive researches have been done in the traditional networks. Most of these works assume that there exists a powerful synchronization controller in the network. However, for WMSNs, the in-network processing of the multimedia content...
In the radio channel, compression is used for transmission of real-time analog video signal and compressed bits can usually be transmitted at a non-constant rate. But standard video can be displayed on TV at a constant rate. It is difficult to decode the intermittent compressed data for real-time video display. In order to solve the problem which rate of video decoding and compressed bits in the radio...
in order to achieve the reliable decoding when the real-time video compression bit streams are transmitted in radio channel, the effective channel code method is given. It is based on the Turbo product codes with AHA4501. The performance of its delay time and error correction is evaluated. The selection of block size, the iteration number and frame sync header and is described. And the method has...
Experimental data on the propagation of streamers in mineral oil is important for the design of high-voltage systems in the power and pulsed-power industries. In the present study, pre-breakdown delay times were measured for plane-parallel electrodes, and for two types of non-uniform electrode arrangement. For each geometry, the breakdown characteristics were determined for impulses of rise-time 100...
Rich media application enables plenty of interactive, information-rich services to enhance end user's viewing experience. In current standards released for such service, only one rendering space is defined to handle multiple types of content belonging to the same service. However, a new trend is to assign more than one terminal device to render rich media application in a cooperative way inside a...
802.11e HCCA (Hybrid coordination function Controlled Channel Access) exhibits good QoS provisioning for constant bit rate (CBR) video streams in a single collision domain. However, its performance degrades significantly for variable bit rate (VBR) video streams particularly in multi-collision domains. In addition, HCCA has the disadvantage of high complexity. In this paper, we introduce a deterministic...
A real-time, interactive video distribution system on Internet for large-scale users faces three bottlenecks: real-time performance, interactive performance and bandwidth pressure. This paper, based on the approach to establish a Real-time Peer-to-Peer network (RTP2P) with the minimum video data delay as the primary goal, and establish a hybrid framework of P2P and centralized networks, argues that...
Applications involved with multimedia streaming are blooming with the development of Internet and wireless networks. In this paper, we address the problem of how to jointly leverage power control and rate allocation to achieve high-performance video streaming with strict delay and energy over wireless ad-hoc networks. We focus on media-aware rate allocation and power control with goal of minimizing...
In the future, different types of networks will be integrated. The heterogeneous networks should support a broad range of multimedia services with guaranteed quality of service. In order to support the requirements, a new call admission control is needed to support the integrated architecture. In this paper, we focus on admission control in heterogeneous network platform. Because rejecting a handoff...
This paper aims at providing different cost-efficient solutions for the channel impairments in tropical areas. In order to extend service to isolated areas, we propose an hybrid architecture based on DVB-S2/RCS + Wi-Fi networks. In this scenario, the delay of the ACM reaction to fade changes can affect the quality of the video transmission, especially because of the characteristics of tropical deep...
In this paper we present an idea for guaranteed performance in real time video communication with error resiliency. The idea carries three main concepts called connection establishment with user defined performance parameters, back pressure re-routing and error resiliency by feedback control. The performance parameters we consider here are time delay and bandwidth. Establishing a connection that gives...
New emerging technologies like Multimedia applications require timely delivery of information as compared to reliability. The most widely used protocols over transport layer are Transmission Control Protocol (TCP) and User Datagram Protocol (UDP). Both of these have some drawbacks while using in real time applications. TCP increases delay in transfer of data but achieving reliable transfer of data...
The ubiquity and simplicity of HTTP makes it a popular choice for Web-based video retrieval. However, HTTP was not designed for retrieving data with just-in-time tolerances; HTTP servers have always taken an as-fast-as-possible approach to data delivery. For media with known bandwidth constraints (e.g., audio/video files), HTTP servers can be enhanced and optimized by taking these constraints into...
In ad-hoc networks, the video quality of real-time services is greatly decreased when bandwidth reduction and channel access delay occur. In this paper, a dynamic frame rate adjustment of video transmissions is proposed in case of network congestion. Simulation results show that our approach improves the quality of real-time video over IEEE 802.11 based vehicular networks by guaranteeing a better...
This paper aims at providing different cost-efficient solutions for the channel impairments in tropical areas. In order to extend service to isolated areas, we propose hybrid architecture based on DVB-S2/RCS+Wi-Fi networks. In this scenario the satellite channel is affected by deep rain events that do not allow ACM modes to protect data. Moreover, the delay in the ACM reaction to fade changes can...
Recently, video streaming has been extensively used for information broadcasting. Availability of improved and enhanced transmission facilities make it possible to use video streaming in fast real time applications. Real time video transmission is widely used in surveillance, conferencing, media broadcasting and applications that include remote assistance. Though a lot of work has already been done...
To reduce the delay of video broadcast system, we analyze system-capacity in a discrete-time manner. And we propose a hybrid architecture MTreeTV which combines the use of P2P networks with dedicated streaming servers. We also evaluate the effect of the server and client parameters. Through analysis and simulation, we show that MTreeTV supports fast channel switching (<4S).1.
Being a fast-growing Internet application, streaming media application shares the network resources with the regular Internet traffic, and is susceptible to the existing security holes of the Internet, such as SETUP request flooding attack, session hijacking attack, TEARDOWN attack and RTP attack. In this paper, we propose a highly needed streaming media intrusion detection system. Our approach is...
Acoustic sensor networks can provide rich multimedia information, which doubtlessly benefit a plethora of data hungry applications such as environment monitoring, health care, emergency response, and security surveillance. In this paper, we study the data unit delivery process of cluster head by developing a discrete-time Markov chain model and a M/G/1 queue model, based on a single-hop cluster-based...
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