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Traffic simulations on a BWA system
2001 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Broadband Wireless Access (BWA) has in recent years attracted much interest as a means to provide its users with high-speed data and multimedia services. It is attractive since deployment is fast and easy, the infrastructure cost is low and it can provide coverage where wired solutions cannot. Local Multi-point Distribution Service (LMDS) is a common term for BWA systems operating in the frequency bands above 20 GHz. The main drawback with LMDS is the high operating frequency, which makes the radio signals very susceptible to distortions such as rain and mist, as well as obstacles in the transmission path. Skanova Networks is interested in the LMDS technique and in understanding how various channel conditions, due to for example fading and noise, affect the transmission of different services. It is because of this desirable to have an accurate, yet simple, simulation model of a BWA system. In this thesis a simulation model for a typical BWA system is presented and implemented. The simulation model consists of two parts. One part is completely analytical and is based on a model proposed by J.G. Kim and M. Krunz. The other part, which is used as a reference, is semi-analytical and it is based on both simulations and analytical formulas. The Cell Loss Ratio (CLR), throughput and retransmission delay of the system have been investigated for various channel conditions, by using the semi-analytical model. The minimum amount of bandwidth, which needs to be assigned to the channel in order to reach an a priori target CLR is incorporated in the model, by using the analytical approach. Simulations where the analytical model is contrasted with the reference model show that they initially do not completely agree. However, by proper scaling the models can be made to agree very well. The results in this thesis indicate that the analytical model could be used to rapidly provision bandwidth in future BWA systems with only a marginal deviation from the reference model implemented.

Place, publisher, year, edition, pages
Keyword [en]
Technology, Data traffic, BWA, LMDS, Markov, radio, channels, buffer, source, ATM, CLR, retransmission
Keyword [sv]
URN: urn:nbn:se:ltu:diva-57721ISRN: LTU-EX--01/278--SELocal ID: e5b75771-e558-4eb8-8266-148b5704321cOAI: diva2:1031109
Subject / course
Student thesis, at least 30 credits
Educational program
Electrical Engineering, master's level
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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