The spate in popularity of multimedia applicationsudhas led to the need for optimization of bandwidth allocationudand usage in telecommunication networks. Modernudtelecommunication networks should by their definition be able to maintain the quality of different applications with different Quality of Service (QoS) levels. QoS requirements are generally dependent on the parameters of network andudapplication layers of the OSI model. At the application layer QoS depends on factors such as resolution, bit rate, frame rate, video type, audio codecs, etc. At the network layer, distortions such as delay, jitter, packet loss, etc. are introduced. This paper presents simulation results of modeling video streaming over wireless communications networks. The differences in spatial and time characteristics of the different subject groupsudwere taken into account. Analysis of the influence of bit error rate (BER) and bit rate for video quality is also presented.udSimulation showed that different video subject groups affectudthe perceived quality differently when transmitted overudnetworks. We show conclusively that in a transmission networkudwith a small error probabilities (BER = 10-6, BER = 10-5), theudminimum bit rate (128 kbps) guarantees an acceptable videoudquality, corresponding to MOS > 3 for all types of frames.
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