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A study of TD-CDMA and WCDMA radio network enhancements

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Published in
Jyväskylä studies in computing
Authors
Kurjenniemi, Janne
Date
2005
Discipline
Tietotekniikka

 
Janne Kurjenniemen tutkimus käsittelee kolmannen sukupolven matkapuhelinjärjestelmien (TD-CDMA- ja WCDMA-järjestelmät) jatkokehittämistä ja järjestelmien suorituskyvyn arviointia simulointien avulla. Nykyaikaiset matkapuhelinjärjestelmät ovat laajoja kokonaisuuksia, jotka vaativat tarkat määrittelyt, jotta eri valmistajien laitteet toimisivat moitteettomasti yhdessä. Kurjenniemi määritti väitöstyössään järjestelmien vaatimuksia simulointien perusteella. Hän on mukana luomassa kolmannen sukupolven matkapuhelinjärjestelmien standardeja kansainvälisessä 3GPP-projektissa. Kurjenniemen tutkimuksessaan jatkokehittämää radioverkkosimulointityökalua voidaan käyttää tutkittaessa TD-CDMA- ja WCDMA -järjestelmien parametreja ja algoritmeja standardointia varten, radioresurssienhallinta-algoritmien kehitystyön apuvälineenä, kehitettäessä verkkosuunnittelutyökaluja sekä radioverkkojärjestelmien optimointityökaluna.
 
The aim of this study is to analyze UMTS terrestrial radio access performance including TDD and FDD modes. 3.84 Mcps TDD Mode of UTRA is based upon a combined time and code division multiple access and it is commonly referred to as TD-CDMA, whereas UTRA FDD mode is based upon a Wideband Code Division Multiple Access (WCDMA).Analysis of the UTRA TDD mode concentrates on three important radio resource management algorithms, namely power control, handover and dynamic channel allocation. Power control analysis contains both uplink and downlink studies and it is found that careful setting of the main parameters are needed to guarantee a robust system operation.WCDMA type of handover is considered for the TD-CDMA and the effect of its applicability is evaluated with extensive simulations. The effect of different handover parameters on the system capacity is studied in an indoor environment.Dynamic Channel Allocation (DCA) is TDD specific algorithm to allocate resources for transmission. It can be divided into slow DCA (S-DCA), which allocates resources to cells and fast DCA (F-DCA), which allocates resources to bearer services. In this thesis different F-DCA algorithms are described and analyzed under different S-DCA parameters.The studied topics for the WCDMA are transmit diversity and advanced receivers. The system performance evaluation with transmit diversity starts from dedicated channels and then the High Speed Downlink Packet Access (HSDPA) network performance is analyzed. Performance of Space Time Transmit Diversity (STTD) and Closed Loop Mode 1 (CL Mode 1) are compared to conventional 1Tx transmission.Further enhancements for the HSDPA are currently an interesting research topic. In this thesis HSDPA system performance with receive diversity and Linear Minimum Mean Squared Error (LMMSE) chip level equalizer is compared to conventional Rake receiver with extensive dynamic system level simulations. ...
 
Publisher
University of Jyväskylä
ISBN
951-39-2278-2
ISSN Search the Publication Forum
1456-5390
Keywords
tietotekniikka matkapuhelinjärjestelmät radioverkot tietoliikenneverkot simulointi
URI

http://urn.fi/URN:ISBN:951-39-2278-2

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  • Väitöskirjat [3349]

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