The perceptual quality of VoIP conversations depends tightly on the pattern of packet losses, i.e., the distribution and duration of packet loss runs. The wider (resp. smaller) the inter-loss gap (resp. loss gap) duration, the lower is the quality degradation. Moreover, a set of speech sequences impaired using an identical packet loss pattern results in a different degree of perceptual quality ...

In this paper, the performance of routing protocols DSDV, OLSR and AODV using performance metrics like Packet Delivery Ratio, Average End to End delay, Packet Loss Ratio and Average Throughput within Vehicular ad hoc networks for CBR applications over UDP connection has been analyzed. Network Simulator (NS-3.19) along with mobility model generated through Simulation of Urban Mobility (SUMO) too...

W e address the problem of video quality prediction and control for high-resolution video transmitted over lossy packet networks. In packet video, the bitstream ̄ows through several subsystems (coder, network, decoder); each of them can impair the information, either by data loss or by introducing some delay. However, each of these subsystems can be ®netuned in order to minimize these problems a...

In an ad-hoc network’s there is no specific infrastructure and no static topology. It has more dynamic topology that changes over time and less battery power of the nodes, less bandwidth and transmission quality enhancements. It supported Real time & multimedia application by Manet. QOS have parameter like as easy bandwidth utilization, less delay, minimum packet loss, good throughput, jitter. ...

Abstract- Efficient message delivery in city environment is required to ensure driver’s safety and passenger’s comfortability. In cities of developed nations, routing of data in vehicular Ad hoc Network (VANET) faces many challenges such as radio obstacles, mobility constraints and uneven nodes distribution. These factors primarily makes communication between vehicles complex. To overcome and t...

One of the main issues in securing multicast communication is the source authentication service. In this work we address the multicast stream authentication problem when the communication channel is under the control of an opponent who can drop, reorder or inject data. In such a network model, packet overhead, computing efficiency and robustness against packet loss are important parameters to b...

The end-to-end packet delay is an important performance parameter on the Internet, because it heavily affects the quality of realtime applications. Currently, however, because the packet transmission quality (e.g., transmission delay, jitter, packet loss) may vary dynamically, it is not easy to handle real-time traffic. For UDP-based real-time applications, a smoothing buffer (playout buffer) i...

Denial-of-service (DoS) attacks are a serious problem affecting the Internet today with security firms estimating over 5000 attacks are launched per day, leading to revenue loss and tarnished reputations for online businesses. These attacks remain prevalent and successful because the Internet has no mechanism to distinguish wanted from unwanted packets. The core of the Internet impartially forw...