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Real time video traffic modelling and simulations in third generation mobile networks
2000 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

In UMTS, the next generation mobile telephone system, many kinds of services with different bitrate and delay requirements will be supported. There will be both circuit switched services such as speech and video-telephony and packet switched services such as web browsing and sending emails. The main factor that will limit the capacity in UMTS is interference. Therefore the knowledge of the different services traffic characteristics is very important for the operators to be able to design the net properly. Traffic models for real time mobile video communication such as video-telephony and video conferencing has not been well studied and even if penetration of these services will be limited in UMTS, the bitrates may be high. In this Master's thesis a model of real time variable bitrate (VBR) video is created and implemented in a WCDMA simulation tool. The simulations show that when using variable bitrate video the bitrate variations have to be controlled. Too large variations (large peaks) will cause problems for other users in the system, leading to unnecessarily decreased system performance. A comparison of a variable bitrate service and a constant bitrate (CBR) service has been made. For mean equivalent bandwidth (throughput), a measure that is closely related to operator income, a factor of two difference could be seen between the VBR and CBR service. Further the new very flexible multimedia standard MPEG-4 is investigated to see how useful it can be for real time mobile video communication. In particular the Simple Profile is believed to be well suited in wireless error-prone networks. MPEG-4 supports the use of VBR video with a rate control scheme that attempts to achieve optimum quality given a maximum possible bitrate, which is exactly what we want for a good system performance. In UMTS, where not only the radio channel will vary constantly but also the geographical coverage for different channel bandwidths (10-2000 kbit/s), scalability would be very interesting to use. E.g. depending on the demands and nature of a user he can be guaranteed a certain quality (a minimum bitrate) but if possible he can receive better quality. Both spatial and temporal scalability on rectangular objects is possible in the Simple Scalable Profile in MPEG-4 and this is why we believe that this profile will be very interesting to use in UMTS applications as well.

Place, publisher, year, edition, pages
Keyword [en]
Technology, Signalbehandling, UMTS, WCDMA, radio, MPEG-4, traffic, modelling, video
Keyword [sv]
URN: urn:nbn:se:ltu:diva-52722ISRN: LTU-EX--00/141--SELocal ID: 9d286cb4-205b-47cf-a447-7722a515e544OAI: diva2:1026094
Subject / course
Student thesis, at least 30 credits
Educational program
Civil Engineering programmes 1997-2000, master's level
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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