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Lägg inte ut fulltext (aug.01)/YS Redundancy aspects and traffic control in a WCDMA base station utilizing rational rose realtime
2001 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Ericsson Erisoft AB in Luleå develops control software for Wideband Code Division Multiple Access (WCDMA) base stations. Today the code for the system is written in the C programming language. The purpose of the Master Thesis is to examine if Rational Rose Real Time is able to produce a system that fulfils existing requirements for the WCDMA base station. Rational Rose Real Time is a tool used for developing real-time systems. The models in RealTime are represented in object-oriented fashion using C++, and is therefore different compared to the imperative C language. Object- oriented languages often have a higher level of abstraction than imperative languages. The most critical implementation problem is the “redundancy problem”. The call control function resides on two identical cards in the base station, one that is in active mode and one that is in stand-by mode. There are some aspects that need to be taken into consideration when switching between the cards. The switching must be done within specific time limits, and the information residing on the active card must not be lost. To examine if Rational Rose RealTime has the ability to solve this problem, a “light” version of the call setup procedure is designed using the application. The conclusion from the implementation is that it is possible to solve the redundancy problem using RealTime. Switches can be performed without any information losses, and might fulfill the existing time limit requirements. It is however difficult to predict how the application will work for more complex systems.

Place, publisher, year, edition, pages
Keyword [en]
Technology, Redundancy, Rational Rose RealTime, WCDMA, UMTS, 3G
Keyword [sv]
URN: urn:nbn:se:ltu:diva-46476ISRN: LTU-EX--01/160--SELocal ID: 41c863de-643e-483e-ad2b-626cc0ee567aOAI: diva2:1019790
Subject / course
Student thesis, at least 30 credits
Educational program
Computer Science and Engineering, master's level
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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