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Efficient content distribution is a critical challenge in vehicular networks (VANETs). This is due to the characteristics of vehicular networks, such as high mobility, dynamic topologies, short-lived links and intermittent connectivity between vehicles. Recently, information-centric networking (ICN) has been proposed to VANET scenarios for improving content delivery of infotainmentapplications. However,...
Recently, the Internet of Things (IoT) has attracted the interest of network researchers all over the world. Multimedia transmission through IoT presents an important challenge owing to nodes diversity. In this paper, adaptive versions of the real-time transport protocol (RTP) and real-time control protocol (RTCP), i.e., IoT-RTP and IoT-RTCP, are proposed. In these versions, the nature of IoT environments,...
The previous work, suggests a portioned picturebroadcasting system where screens of small size are accumulated togenerate screen of bigger size through Ethernet network interfacethat helps in easy install & implementation of digitized displaydevices. The system makes use of Texas Instruments Da Vinciplatform, that is comprised of Da Vinci TMS320DM6646 dual coreCPU along an ARM9 core & C64+...
The Stream Control Transmission Protocol (SCTP) supports multiple streams to minimize the performance degradation due to head-of-line blocking. Among several streams transmitted simultaneously, some stream may require smaller transmission time than the others. However, the current SCTP provides no facility for controlling the access frequency of respective streams. This paper proposes a new scheme...
The quality of service in Wireless Multimedia Sensor Networks (WMSN) is related to packet loss rate. Recently different studies have been done on developing efficient protocols in the transport layer for controlling packet loss in WMSN. However, all of these protocols are independent of the characteristics of multimedia content. Transport layer for wireless sensor networks have many challenges. One...
Many multimedia applications employ transmission control protocol (TCP) to send video packets. TCP ensures reliable transmission but experiences significant delays. Various techniques have been proposed to enhance the performances, for instance by controlling TCP window. This paper proposes a split-routed acknowledgement packet that is aimed to reduce acknowledgement delay. The simulation evaluations...
CDNs are today the most scalable way of distributing content. Thanks to CDN interconnection even smaller operators can achieve global footprint. The main cost of this operation is the added latency because requests have to traverse multiple autonomous networks. The work in this article was able to quantify the real impact of this phenomenon and to point to its drawbacks and potential solutions.
End-users in online video services are sensitive to the overall quality of the video at screen, but also, and more importantly, to other factors, including the latency between the video generation and the playback for live videos. If the improvement of the quality of the perceived video has been well investigated by the multimedia community, the impact of delay, latency, and re-buffering has not received...
Mobile nodes in a robust and challenging network scenario of Mobile Adhoc Network (MANET) are autonomous with self-configurable capability due to high frequency of topology change and unpredictable rearrangement of the network components during data transmission. Due to ease of set up , the vigorous networking system in MANET is very successful in conditions where it is difficult to create infrastructure...
As a technical method over VANETs, video delivery has the potential power to enhance the application experience associated with traffic safety, management and infotainment. The experience of user is seriously affected by the quality of the video display. Therefore, Quality of Experience (QoE) enhancement for video delivery in VANETs is an important issue. However, the high mobility and dynamic nature...
Emergency warning applications in a vehicular ad hoc network (VANET) requires successful dissemination of warning notification within a geographical area spanning multiple hops. Multimedia transmission provides an accurate overview of the emergency event in the form of an image, an audio or a video. However, the reliable transmission of emergency multimedia messages using multi-hop broadcast techniques...
Vehicular communications are important to ensure emergency messages are transmitted on time to prevent accidents. Therefore, in recent years, various standardization bodies and automobile companies have developed vehicular ad hoc network (VANET) to ensure public road safety. The current IEEE802.11p schemes utilize only traffic type to categorize priority levels. However, accidents are prone to occur...
The need for measuring the sound quality in VOIP environment is a basic requirement of modern multimedia communication systems due to technical, commercial and legislative reasons. Measuring the sound quality using objective methods is not standardized up till now. Expected measurement results should be in correlation with subjective tests of sound quality. The usage of application for measurement...
The next-generation heterogeneous networks aim to offer users of various networks seamless high quality IP-based multimedia services access anywhere at any time. IMS (IP Multimedia Subsystem) comes as a promising overlay service that provides a platform through which telecommunications operators can merge various networks to provide seamless data services. In this paper, we propose an architecture...
IP Multimedia Subsystem (IMS) has been standardized by 3GPP/3GPP2 to provide essential services to users of the 4G and beyond. Its capabilities to scale and integrate with Next Generation Network (NGN) has given IMS widespread applicability in the Next Generation Networks (NGN). IMS relies heavily on SIP (Session Initiation Protocol) to insure initialization, negotiation and termination of services...
With the proliferation of connectivity enabled smartphones and the huge amount of data that everyday users generate through Web 2.0, the Internet is becoming bigger and bigger. The possibility to search for objects and users' profiles is at the base of the Internet of Everything paradigm. Surprisingly, the more we expand our interconnecting possibilities, the more we are interested in local, context-related...
Most of the multimedia applications use the User Datagram Protocol (UDP) as a transport layer protocol because it is suitable for the delivery of multimedia data over the Internet. However, the use of UDP could endanger the stability of the network because there is no congestion control applied. To a certain extent, the network can collapse if too many applications deliberately use this protocol....
TCP, the facto standard used in today's Internet, has been found to perform poorly in Mobile Ad Hoc Networks (MANETs). This is exacerbated by contention with increasing UDP-based high priority multimedia traffic and the class differentiation introduced in current QoS protocols, which results into TCP starvation and increased spurious timeouts. In this paper, we propose a cross-layer TCP enhancement...
In mOBCP (mini-overlay broadcasting control protocol), Multicasting tree transformation has proved to provide a modest service for multi-viewers sharing content-source. A mechanism is proposed to apply the tree transformation function in mOBCP to provide efficient real-time, concurrent service. The multimedia trees transformed have maximum peak RTT values of about 0.6 seconds - better than TBCP and...
Explicit congestion notification (ECN) is a mechanism that can be used to provide early indication of impending Internet congestion, and as such can be used to reduce the latency and improve the throughput of applications using the Internet. This paper examines the impact of using ECN with quality of service classification for Internet paths that include a satellite delay. Specifically, it provides...
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