<p>The WCDMA air interface, used in the third generation mobile communication systems, is currently being evolved to improve the uplink, i.e. the radio links carrying traffic from the mobile user to the fixed network. An enhanced uplink concept is being developed to meet the expected needs from future applications like multimedia and video-streaming. This thesis studies interference management when high bit rates are introduced in the enhanced uplink. The study is performed through theoretical assessments and simulations using WCDMA system simulators.</p><p>An optimization scheme using a basic system throughput based scheduling is derived to attain a theoretical assessment of bit rate limits. The throughput optimization is achieved at the expense of user-experienced fairness. Users located on cell coverage area overlap show to be most complicated to manage.</p><p>The need for interference management is primary when the network deployment consists of small cells while coverage requirements are most essential when the cell size increases. By exploiting the benefits of directional antennas the antenna tilt can be tuned to increase performance resulting in increased bit rates, increased system throughput and increased resource efficiency. The improvements are attained without trade-offs and the different components of the study concur unanimously.</p>

The WCDMA air interface, used in the third generation mobile communication systems, is currently being evolved to improve the uplink, i.e. the radio links carrying traffic from the mobile user to the fixed network. An enhanced uplink concept is being developed to meet the expected needs from future applications like multimedia and video-streaming. This thesis studies interference management when high bit rates are introduced in the enhanced uplink. The study is performed through theoretical assessments and simulations using WCDMA system simulators. An optimization scheme using a basic system throughput based scheduling is derived to attain a theoretical assessment of bit rate limits. The throughput optimization is achieved at the expense of user-experienced fairness. Users located on cell coverage area overlap show to be most complicated to manage. The need for interference management is primary when the network deployment consists of small cells while coverage requirements are most essential when the cell size increases. By exploiting the benefits of directional antennas the antenna tilt can be tuned to increase performance resulting in increased bit rates, increased system throughput and increased resource efficiency. The improvements are attained without trade-offs and the different components of the study concur unanimously.

<p>The evolvement of the uplink in the third generation mobile telecommunication system is an ongoing process. The Enhanced Uplink (EUL) concept is being developed to meet the expected need from more advanced services, like video streaming and mobile broadband. One idea for further improvement in the EUL concept is to introduce Time Division Multiple Access (TDMA), which is studied in this master thesis.</p><p>The master thesis assignment is to study the consequences of introducing TDMA in EUL. The goal has been to identify the gains and problems, and how they can be handled. A derived theoretical framework and system simulations, using a radio network simulator, are used.</p><p>The overall conclusion is that there is a potentially large gain with an introduction of TDMA in EUL. Simulations in favorable conditions have shown that the system throughput can increase by 100% when there are only User Equipment (UE) that are using EUL in the system and by 50% when there is a mix of speech and EUL UE’s. When using TDMA the uplink load also shows improvements, the mean is generally higher but the variance is generally smaller.</p><p>Due to major differences in experienced interference between passive and active UE’s, the signal quality will vary a lot. The big variation in signal quality is identified as the main problem with introducing TDMA in EUL. It is shown that this problem can generate extreme high uplink load, which have a negative impact both on the resource efficiency and the coverage.</p>

The evolvement of the uplink in the third generation mobile telecommunication system is an ongoing process. The Enhanced Uplink (EUL) concept is being developed to meet the expected need from more advanced services, like video streaming and mobile broadband. One idea for further improvement in the EUL concept is to introduce Time Division Multiple Access (TDMA), which is studied in this master thesis. The master thesis assignment is to study the consequences of introducing TDMA in EUL. The goal has been to identify the gains and problems, and how they can be handled. A derived theoretical framework and system simulations, using a radio network simulator, are used. The overall conclusion is that there is a potentially large gain with an introduction of TDMA in EUL. Simulations in favorable conditions have shown that the system throughput can increase by 100% when there are only User Equipment (UE) that are using EUL in the system and by 50% when there is a mix of speech and EUL UE’s. When using TDMA the uplink load also shows improvements, the mean is generally higher but the variance is generally smaller. Due to major differences in experienced interference between passive and active UE’s, the signal quality will vary a lot. The big variation in signal quality is identified as the main problem with introducing TDMA in EUL. It is shown that this problem can generate extreme high uplink load, which have a negative impact both on the resource efficiency and the coverage.

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Made available in DSpace on 2014-12-17T14:55:57Z (GMT). No. of bitstreams: 1 EduardoJB.pdf: 1367282 bytes, checksum: 6b7509a3a7d719223deb44d539d92c51 (MD5) Previous issue date: 2005-12-16 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / The introduction of new digital services in the cellular networks, in transmission rates each time more raised, has stimulated recent research that comes studying ways to increase the data communication capacity and to reduce the delays in forward and reverse links of third generation WCDMA systems. These studies have resulted in new standards, known as 3.5G, published by 3GPP group, for the evolution of the third generation of the cellular systems. In this Masters Thesis the performance of a 3G WCDMA system, with diverse base stations and thousand of users is developed with assists of the planning tool NPSW. Moreover the performance of the 3.5G techniques hybrid automatic retransmission and multi-user detection with interference cancellation, candidates for enhance the WCDMA uplink capacity, is verified by means of computational simulations in Matlab of the increase of the data communication capacity and the reduction of the delays in the retransmission of packages of information / A introdu??o de novos servi?os digitais nas redes celulares, em taxas de transmiss?o cada vez mais elevadas, tem impulsionado recentes pesquisas que v?m estudando maneiras de aumentar a capacidade de transmiss?o de dados e diminuir os atrasos nos enlaces direto e reverso de sistemas de terceira gera??o WCDMA. Esses estudos t?m resultado em novos padr?es, chamados de 3.5G, publicados pelo grupo 3GPP, para a evolu??o da terceira gera??o dos sistemas celulares. Nesta disserta??o de mestrado o desempenho de um sistema de 3G WCDMA, com diversas esta??es base e milhares de usu?rios ? analisado com aux?lio da ferramenta de projetos NPSW. Al?m disso a performance das t?cnicas de 3.5G redu??o do tamanho do quadro de transmiss?o, retransmiss?o autom?tica h?brida e detec??o multi-usu?rio com cancelamento de interfer?ncias, candidatas para amplia??o do uplink de redes WCDMA, ? verificada por meio de simula??es computacionais, na linguagem Matlab, do aumento da capacidade de transmiss?o de dados e da diminui??o dos atrasos na retransmiss?o de pacotes de informa??o. Palavras-Chave: WCDMA, UMTS, capacidade de transmiss?o, t?cnicas de 3.5G EUL, redu??o do quadro de transmiss?o, retransmiss?o autom?tica h?brida, detec??o multi-usu?rio, cancelamento de interfer?ncias