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Short range ad-hoc wireless networks can be used to deliver streaming multimedia for information, entertainment and advertisement purposes. To enable short-range communication between various devices, the Wi-Fi Alliance proposed an extension to the IEEE802.11 Wi-Fi standard called Wi-Fi Peer-to-Peer (P2P). It allows compliant devices to form ad-hoc communication groups without interrupting conventional...
Recently, Vehicular Ad-hoc Network (VANET) has been drawing lots of attentions from many researchers. It is considered as an important future network for Intelligent Transportation Systems (ITS). Meanwhile, the cloud network has been gradually accepted by more and more customers as a flexible storage and computing facility. In this paper, we propose a novel communication system to integrate vehicular...
With the rapid development of new applications and services in vehicular environment, there is an increasing demand for mobile users to access data items. Moreover, Road Side Unit (RSU) has been introduced by researchers to facilitate data dissemination in Vehicular Ad-hoc Networks (VANETs). Therefore, it is necessary to design a data access scheme for vehicle-to-roadside (V2R) communications. However,...
Wireless Multimedia Sensor Networks (WMSNs) advances have enabled to transmit video applications. However, WMSNs technology does not fulfil the quality of service requirement yet because of multi-hop manner, changing bandwidth, and limited resources. Whereas video applications require specific Quality of Service (QoS), namely high throughput, low end-to-end delay, and packet drop rate. This paper...
The protocol and compatible interconnection of data and multimedia communication equipment via 2.4 GHz and 60 GHz radio transmissions in a Wireless Personal Area Network (WPAN) using low power and multiple modulation formats to support scalable data rates is defined in this standard. The Medium Access Control (MAC) sublayer protocol supports both isochronous and asynchronous data types.
Nowadays Vehicular Ad hoc Networks is one of the most promising application areas of the wireless networks, able to organize without predefined infrastructure. In particular, the transmission of video data in the ad-hoc represents a major issue due to the immense enrichment by the video information of the quality of experience perceived by the user and knowledge of the environment in many applications...
In wireless communication networks link adaptation techniques are widely used to improve the quality by adapting various parameters of channel. Adaptive modulation and coding (AMC) is one such technique which adopts various modulation techniques based on certain channel conditions like received signal power or signal strength or distance. This paper compares simulation results of adaptive modulation...
Vehicular Swarm Network (VSN) technology enables real time inter-vehicular communications for broadcasting all kinds of data collection, including emergency video with high data rate. A challenge in VSN broadcasting is to achieve a high throughput rate while at the same time assure the delivery of video packet flows to all the vehicles traveling over a highway segment from the accident vehicle. This...
Newly, with the emergence of demanding applications e.g. multimedia applciations and its rapid prevalence on a large scale area e.g. urban environment. Supporting the scalability as well as satisfying QoS of demanding applications represent one of the main properties in urban environments. However, supporting applications and services in a such complex, distributed, large and diverse environment as...
Multimedia delivery systems and protocols usually assume end-to-end connections and low delivery delays between multimedia sources and consumers. However, neither of these two properties can always be achieved in hastily formed networks for emergency response operations. In particular, disruptions may break end-to-end connections, which makes it impossible to deliver multimedia content instantly....
Obtaining the accurate estimation of available bandwidth is precondition of QoS-guaranteed. In this paper, we proposed a novel available bandwidth estimation mechanism in 802.11 RTS/CTS by correct measurements of 1) a new coefficient, called channel utilization ratio, which considering the QoS of realtime multimedia, 2) overhead by the control messaging. Simulation result shows that taking the channel...
Vehicular Ad-hoc networks (VANETs) provide a way for a vehicle to deliver various types of information to users or drivers in other vehicles. Distributing a large amount of information such as multimedia messages in a single control channel makes the control channel easily congested. Transmitting multimedia messages through multi-channel to avoid this congestion becomes a feasible solution. However,...
We report performance measurements and analyses of a variety of wireless networks to arrive at an appropriate network structure configuration for smooth multimedia streaming service with a variety of smart devices in a single wireless network environment. Unlike the usual infrastructure network, configurations such as the IEEE 802.11 ad hoc network and the Wi-Fi direct network use direct connections...
In-vehicle multimedia applications are gaining interest since recent years. However, the high loss rate caused by high mobility in vehicular ad-hoc networks (VANETs) imposes several challenges in multimedia transmission. Moreover, in the context of multimedia, the quality of service (QoS)-based approaches assess the quality of streaming services through network-oriented metrics while the concept of...
The growing need for multimedia applications within wireless Local Area Networks (LAN) demands reliable and efficient broadcasting and multicasting transmission of throughput sensitive data, like audio and video. IEEE 802.11 standard which is the primary technology in wireless LANs was not initially designed to handle heavy broadcasting traffic. However, this raises a series of reliability problems...
As of today's current communication system, all Fire Fighters (FFs) use the simplex Radio Frequency (RF) system (walkie-talkie) to communicate with each other. Serious problems and injuries can occur because of the current communications system; so far, very little attention has been dedicated to solve these problems. Mobile Ad-Hoc Networks (MANETs) are infrastructure-less and self-organized wireless...
The increasing use of multimedia streaming applications in addition with advent of internet television and radio, demands from today's wireless networks to handle with reliability multiple broadcasting and multicasting sources. However, the way that 802.11 standard, which is the primary technology in wireless networking, handle this type of traffic raises a series of problems mainly related to the...
The wireless mobile network is a dynamic environment. The characteristics of the wireless mobile communication include limited channel bandwidth, high BER, dynamic change over time, unstable channel quality, mobile node, competition of multiple users to share the channel, and the users' wireless signal interference from other nodes of the shared channel. These characteristics of wireless communication...
When a passenger in a vehicle wants to watch video during movement, he may request video through cellular network, e.g., 3G or 3.5G network. However, due to the characteristics of vehicular networks, the limited bandwidth of 3G/3.5G network is not enough to support high resolution or high video quality. In order to improve the quality of video playback, this vehicle, which is defined as requester...
In this paper, a multimedia data generation algorithm for multi-user video conferencing system over ad-hoc networks is proposed. In the proposed method, the scene-changed frame is estimated using the number of bits pre-encoded by the hardware accelerator and the percentage of the intra-coded macroblocks in each frame. The resulting scene-changed frames are re-encoded as the intra-coded frames and...
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