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Uma proposta de integração das redes UMTS e IEEE 802.11 com suporte a mobilidade / A proposal of integration of the nets UMTS and IEEE 802,11 with support mobilityNogueira, Antonia Diana Braga January 2007 (has links)
NOGUEIRA, Antonia Diana Braga. Uma proposta de integração das redes UMTS e IEEE 802.11 com suporte a mobilidade. 2007. 112 f. Dissertação (Mestrado em ciência da computação)- Universidade Federal do Ceará, Fortaleza-CE, 2007. / Submitted by Elineudson Ribeiro (elineudsonr@gmail.com) on 2016-07-08T18:49:42Z
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2007_dis_adbnogueira.pdf: 13756193 bytes, checksum: bb4a338bd2622ad6f90479ce37824ccd (MD5)
Previous issue date: 2007 / Wireless Local Area Networks (WLANs) IEEE 802.11 reach relatively high data transmission rates when compared to other wireless networks, such as Bluetooth. These high data transmission rates have gained attention from the cellular networks operators, which have been considering IEEE 802.11 networks as a complement to their access networks. This interoperability between cellular systems and WLANs has been frequently discussed in the literature. For example, 3GPP (Third Generation Partnership Project) has defined six levels for the complete integration of the third generation cellular networks and WLANs. However, the mobility support has not been specified yet, which is necessary to make feasible voice and data transmission transparence for the final users. Thus, this work presents two approaches for the mobility management of the integration between UMTS and IEEE 802.11 networks: the first one is based on SIP (Session Initiation Protocol), and the other one is based on MIPv6 (Mobile IP version 6). This proposal extends the Loose Interworking architecture and uses the fourth level of the 3GPP specification. First, these approaches are modeled using sequence diagrams and, then, they are mapped to the SDL (Specification and Description Language) formal description technique. SDL, which is largely used to formally specify telecommunications systems, presents simulation and validation procedures that are applied to evaluate the specification and, consequently, the proposed approaches. / As redes locais sem fio (Wireless Local Area Networks - WLANs) IEEE 802.11 atingem taxas de transmissão de dados relativamente altas quando comparadas `a outras redes sem fio, por exemplo, Bluetooth. Essas altas taxas de transmissãao têm interessado as operadoras de redes celulares, as quais começam a ver as redes IEEE 802.11 como um complemento as suas redes de acesso. Esta interoperabilidade entre sistemas celulares e WLANs tem sido um tema bastante discutido na literatura. Por exemplo, o 3GPP (Third Generation Partnership Project) define seis n´ıveis para a total integração das redes celulares de terceira geração com as redes locais sem fio. No entanto, a integração com suporte a mobilidade ainda não foi especificada, o que é necessário para viabilizar a transparência de transmissão de voz e dados para os usuários finais. Esta dissertação apresenta então duas abordagens para o gerenciamento de mobilidade na integração do sistema 3G UMTS com as redes IEEE 802.11: uma baseada no SIP (Session Initiation Protocol ) e a outra no MIP versão 6 (Mobile IP version 6 - MIPv6). A proposta estende a arquitetura Loose Interworking e utiliza os requisitos do nível 4 do 3GPP. Para especificar a proposta, as abordagens de integração das redes UMTS e IEEE 802.11 foram modeladas em diagramas de seqüência e, em seguida, mapeadas para a técnica de descrição formal SDL (Specification and Description Language). SDL, que é bastante utilizada para especificar formalmente sistemas de telecomunicações, apresenta procedimentos de simulação e validação que são aplicados para avaliar a especificação e, em conseqüência, as abordagens propostas.
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Uma proposta de integração das redes UMTS e IEEE 802.11 com suporte a mobilidade / A proposal of integration of the nets UMTS and IEEE 802,11 with support mobilityNogueira, Antonia Diana Braga January 2007 (has links)
NOGUEIRA, Antonia Diana Braga. Uma proposta de integração das redes UMTS e IEEE 802.11 com suporte a mobilidade. 2007. 91 f. : Dissertação (mestrado) - Universidade Federal do Ceará, Centro de Ciências, Departamento de Computação, Fortaleza-CE, 2007. / Submitted by guaracy araujo (guaraa3355@gmail.com) on 2016-05-30T19:51:57Z
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2007_dis_adbnogueira.pdf: 13756193 bytes, checksum: bb4a338bd2622ad6f90479ce37824ccd (MD5) / Made available in DSpace on 2016-05-30T19:52:27Z (GMT). No. of bitstreams: 1
2007_dis_adbnogueira.pdf: 13756193 bytes, checksum: bb4a338bd2622ad6f90479ce37824ccd (MD5)
Previous issue date: 2007 / Wireless Local Area Networks (WLANs) IEEE 802.11 reach relatively high data transmission rates when compared to other wireless networks, such as Bluetooth. These high data transmission rates have gained attention from the cellular networks operators, which have been considering IEEE 802.11 networks as a complement to their access networks. This interoperability between cellular systems and WLANs has been frequently discussed in the literature. For example, 3GPP (Third Generation Partnership Project) has defined six levels for the complete integration of the third generation cellular networks and WLANs. However, the mobility support has not been specified yet, which is necessary to make feasible voice and data transmission transparence for the final users. Thus, this work presents two approaches for the mobility management of the integration between UMTS and IEEE 802.11 networks: the first one is based on SIP (Session Initiation Protocol), and the other one is based on MIPv6 (Mobile IP version 6). This proposal extends the Loose Interworking architecture and uses the fourth level of the 3GPP specification. First, these approaches are modeled using sequence diagrams and, then, they are mapped to the SDL (Specification and Description Language) formal description technique. SDL, which is largely used to formally specify telecommunications systems, presents simulation and validation procedures that are applied to evaluate the specification and, consequently, the proposed approaches. / As redes locais sem fio (Wireless Local Area Networks - WLANs) IEEE 802.11 atingem taxas de transmissão de dados relativamente altas quando comparadas `a outras redes sem fio, por exemplo, Bluetooth. Essas altas taxas de transmissãao têm interessado as operadoras de redes celulares, as quais começam a ver as redes IEEE 802.11 como um complemento as suas redes de acesso. Esta interoperabilidade entre sistemas celulares e WLANs tem sido um tema bastante discutido na literatura. Por exemplo, o 3GPP (Third Generation Partnership Project) define seis n´ıveis para a total integração das redes celulares de terceira geração com as redes locais sem fio. No entanto, a integração com suporte a mobilidade ainda não foi especificada, o que é necessário para viabilizar a transparência de transmissão de voz e dados para os usuários finais. Esta dissertação apresenta então duas abordagens para o gerenciamento de mobilidade na integração do sistema 3G UMTS com as redes IEEE 802.11: uma baseada no SIP (Session Initiation Protocol ) e a outra no MIP versão 6 (Mobile IP version 6 - MIPv6). A proposta estende a arquitetura Loose Interworking e utiliza os requisitos do nível 4 do 3GPP. Para especificar a proposta, as abordagens de integração das redes UMTS e IEEE 802.11 foram modeladas em diagramas de seqüência e, em seguida, mapeadas para a técnica de descrição formal SDL (Specification and Description Language). SDL, que é bastante utilizada para especificar formalmente sistemas de telecomunicações, apresenta procedimentos de simulação e validação que são aplicados para avaliar a especificação e, em conseqüência, as abordagens propostas.
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Uma proposta de integraÃÃo das redes UMTS e IEEE 802.11 com suporte a mobilidade / A proposal of integration of the nets UMTS and IEEE 802,11 with support mobilityAntonia Diana Braga Nogueira 24 August 2007 (has links)
Conselho Nacional de Desenvolvimento CientÃfico e TecnolÃgico / As redes locais sem fio (Wireless Local Area Networks - WLANs) IEEE 802.11 atingem taxas de transmissÃo de dados relativamente altas quando comparadas `a outras redes sem fio, por exemplo, Bluetooth. Essas altas taxas de transmissÃao tÃm interessado as operadoras de redes celulares, as quais comeÃam a ver as redes IEEE 802.11 como um complemento as suas redes de acesso. Esta interoperabilidade entre sistemas celulares e WLANs tem sido um tema bastante discutido na literatura. Por exemplo, o 3GPP (Third Generation Partnership Project) define seis nÂıveis para a total integraÃÃo das redes celulares de terceira geraÃÃo com as redes locais sem fio. No entanto, a integraÃÃo com suporte a mobilidade ainda nÃo foi especificada, o que à necessÃrio para viabilizar a transparÃncia de transmissÃo de voz e dados para os usuÃrios finais. Esta dissertaÃÃo apresenta entÃo duas abordagens para o gerenciamento de mobilidade na integraÃÃo do sistema 3G UMTS com as redes IEEE 802.11: uma baseada no SIP (Session Initiation Protocol ) e a outra no MIP versÃo 6 (Mobile IP version 6 - MIPv6). A proposta estende a arquitetura Loose Interworking e utiliza os requisitos do nÃvel 4 do 3GPP. Para especificar a proposta, as abordagens de integraÃÃo das redes UMTS e IEEE 802.11 foram modeladas em diagramas de seqÃÃncia e, em seguida, mapeadas para a tÃcnica de descriÃÃo formal SDL (Specification and Description Language). SDL, que à bastante utilizada para especificar formalmente sistemas de telecomunicaÃÃes, apresenta procedimentos de simulaÃÃo e validaÃÃo que sÃo aplicados para avaliar a especificaÃÃo e, em conseqÃÃncia, as abordagens propostas. / Wireless Local Area Networks (WLANs) IEEE 802.11 reach relatively high data transmission rates when compared to other wireless networks, such as Bluetooth. These high data transmission rates have gained attention from the cellular networks operators, which have been considering IEEE 802.11 networks as a complement to their access networks. This interoperability between cellular systems and WLANs has been frequently discussed in the literature. For example, 3GPP (Third Generation Partnership Project) has defined six levels for the complete integration of the third generation cellular networks and WLANs. However, the mobility support has not been specified yet, which is necessary to make feasible voice and data transmission transparence for the final users. Thus, this work presents two approaches for the mobility management of the integration between UMTS and IEEE 802.11 networks: the first one is based on SIP (Session Initiation Protocol), and the other one is based on MIPv6 (Mobile IP version 6). This proposal extends the Loose Interworking architecture and uses the fourth level of the 3GPP specification. First, these approaches are modeled using sequence diagrams and, then, they are mapped to the SDL (Specification and Description Language) formal description technique. SDL, which is largely used to formally specify telecommunications systems, presents simulation and validation procedures that are applied to evaluate the specification and, consequently, the proposed approaches.
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[en] PERFORMANCE OF ADAPTIVE MODULATION IN WCDMA/HSDPA LINKS IN PRESENCE OF MULTIPATH / [pt] DESEMPENHO DA MODULAÇÃO ADAPTATIVA EM ENLACES WCDMA/HSDPA EM PRESENÇA DE MULTIPERCURSOSMARCELO CORREA RAMOS 12 January 2005 (has links)
[pt] Este trabalho é um estudo sobre um enlace do sistema HSDPA
(High Speed Downlink Packet Access), um subsistema do
padrão UMTS/WCDMA, desenvolvido para a transmissão de dados
em alta velocidade no enlace de descida. Para atingir altas
taxas de transmissão, é prevista a utilização, neste
sistema, de diversas técnicas avançadas de processamento de
sinais, entre elas a modulação adaptativa. O princípio
desta técnica é escolher, para cada quadro de bits
transmitido, a modulação mais adequada às condições do
canal. Através de simulação, o desempenho da modulação
adaptativa em enlaces HSDPA foi avaliado em [4],
considerando um canal com desvanecimento plano. Estendendo
este trabalho, foram introduzidos novos módulos no
simulador, de forma a considerar um canal com
multipercursos e a utilização de um receptor Rake. A
estimação do canal, utilizada na adaptação, é implementada
através da análise do sinal recebido e combinado no
receptor Rake. O desempenho do enlace foi avaliado em
presença de duplo percurso, para diversas situações,
através da taxa de erro de pacote e da vazão obtida na
transmissão, procurando-se investigar a influência de
parâmetros do sistema e da interferência entre os dois
percursos nesse desempenho. / [en] This work is a study about the performance of a HSDPA (High
Speed Downlink Packet Access) which is a subsystem of
UMTS/WCDMA designed for high-speed data transmission in the
downlink. In order to achieve high bit rates, the use of
advanced signal processing techniques, including adaptive
modulation, is specified. This technique consists of
choosing, for each transmitted frame, the most efficient
modulation according to the channel condition. The
performance of adaptive modulation in HSDPA links in a flat
fading channel has been evaluated in [4] through
simulation. In the present work, new simulation modules
have been developed to consider multipath and a Rake
receiver. The channel estimation used in the link
adaptation is obtained from the received and combined
signal at Rake receiver. The link level performance has
been evaluated in a double path channel for different
situations through packet error rate and throughput. The
influence of system parameters and path interference on the
performance has been investigated.
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3G HSDPA Performance In Mobile Internet ConnectionsWang, Xiaoxin January 2004 (has links)
A key objective for 3G wireless networks, such as the Universal Mobile Telecommunication System (UMTS), is the explicit support for data communications for mobile users. Today, the dominant transport protocol in the Internet is the Transport Control Protocol (TCP). Since TCP was not tailored for wireless networks, there are some performance issues occurring when TCP traffic is transferred over a UMTS radio link. In this paper, the characteristics of TCP and UMTS are specified and the problems of TCP over UMTS dedicated channels (DCHs) are analyzed. The problem is high delays implying low utilization of allocated resources for small file transfers or due to packet losses. High Speed Downlink Packet Access (HSDPA)’s potential to solve the problem is studied. Since in HSDPA, High-Speed Downlink shared channel (HS-DSCH) is introduced as an alternative of DCH on downlink packet access, a model of HS-DSCH is built and simulations are performed in order to compare its TCP performance with DCH. The focus is on studying retransmission delay and Block Error Rate (BLER) targets. Some scheduling methods are also compared. The results indicate that HS-DSCH gives better TCP performance than a DCH, and that advanced scheduling methods gives similar result as round robin if there are packet losses. Moreover, a somewhat surprising result is found regarding fast retransmission and channel utilization for increasing BLER targets. / I denna rapport specificeras karaktäristiken för TCP and UMTS, och problemet med TCP över dedikerade UMTS kanaler analyseras. Problemet är höga fördröjningar som medför låg utnyttjande grad av allokerade resurser vid överföring av små filer eller vid paket förluster. High Speed Downlink Packet Access (HSDPA)’s potential att lösa problemet studeras. En modell av HS-DSCH konstrueras och simuleringar utförs för att jämföra dess TCP prestanda med DCH. Fokus är på att studera återsändningsfördröjning och BLER riktvärden. Några scheduleringsmetoder jämförs också. Resultatet indikerar att HS-DSCH ger bättre TCP prestanda än DCH, och att avancerad scheduleringsmetoder ger liknande resultat som round robin vid paket förluster. Dessutom har ett ganska överraskande resultat funnits kring snabb återsändning och kanal utnyttjande grad då BLER riktvärdet ökar.
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[en] TECHNIQUES FOR VOICE TRANSMISSION IMPROVEMENT IN UMTS SYSTEMS / [pt] TÉCNICAS PARA A MELHORIA DE DESEMPENHO DA TRANSMISSÃO DE VOZ NO SISTEMA UMTSEDUARDO RODRIGUES VALE 29 August 2006 (has links)
[pt] A partir da necessidade do transporte de informação
multimídia, foram
desenvolvidos os Sistemas Celulares de Terceira Geração,
ainda em fase de
padronização, cujo candidato mais promissor é o UMTS
(Universal Mobile
Telecommunications System). De forma consonante com a
tendência mundial de
utilização crescente da tecnologia IP (Internet Protocol)
nas redes fixas, o UMTS
veio a incorporar este protocolo, que apresenta uma maior
flexibilidade para a
introdução de novos serviços. Assim, na arquitetura do
UMTS existem atualmente
dois modos de transmissão, a Comutação de Circuitos e a
Comutação de Pacotes.
Esta Tese de Doutorado descreve, inicialmente, os
processos de estabelecimento
de chamadas de voz no UMTS, tanto na modalidade de
Comutação de Circuitos
como na de Comutação de Pacotes. Em seguida, procura fazer
uma avaliação
comparativa da eficiência na execução de chamadas de voz
nestas duas
modalidades, com ênfase de aplicação no sentido uplink de
transmissão. Neste
processo, são desenvolvidas várias formas de otimização de
desempenho da
transmissão na interface aérea do UMTS, em particular na
Comutação de Pacotes,
visando tornar este modo de transmissão competitivo com o
modo de Comutação
de Circuitos em termos de eficiência na transmissão de
voz. Embora o tratamento
aqui apresentado se refira ao UMTS-FDD (UMTS Frequency
Division Duplex),
as técnicas aqui desenvolvidas também encontram aplicação
em outros Sistemas
Celulares de Terceira Geração congêneres, tal como o CDMA
2000. / [en] With the advent of multimedia traffic, Third Generation
mobile systems
were introduced, with the UMTS as the most promissor
candidate. In consonance
with the global trend of utilization of the IP technology
in fixed networks, the
UMTS developers decided to incorporate this protocol,
which presents more
facilities for the introduction of new services.
Therefore, the UMTS architecture
has two transmission modes: Circuit Switching and Packet
Switching Modes. This
Doctoral Dissertation initially describes the call setup
processes (call flows) for
those transmission modes. It follows a comparative
evaluation of the efficiency
aspect related to calls executed in both modes,
considering the case of uplink
transmission. In this process, several optimization
techniques are introduced,
aiming at the improvement of energy consumption in the air
interface. The final
objetive is to turn the Packet Switching Mode competitive
with the Circuit
Switching Mode, relative to the energy consumed for the
transmission of voice
calls. Though the treatment here presented refers to the
UMTS-FDD technology,
all the results are equally applicable to other similar
systems, like the CDMA-
2000.
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Radio Access Network Design for the Evolved UMTS NetworkYan, Xinzhi January 2010 (has links)
Research Doctorate - Doctor of Philosophy (PhD) / The Radio Access Network (RAN) accounts for the major proportion of the UMTS system operating cost. Transmission from radio base station sites contributes a larger part of the RAN operating costs. Selection of suitable transport technologies and proper allocation of network resources are vital from an operator cost optimisation and the Quality of Experience (QoE) points of view. This thesis extensively investigated the performance of a RAN to support multimedia traffic on a HSDPA air interface. Transport network layer of a future RAN could be based on a number of transport protocols such as ATM, IP and Ethernet. With the increasing traffic volume and diversity the efficiencies of IP and Ethernet based RAN could increases significantly due to the use of larger payloads and simpler resource allocation techniques. Also, on IP and Ethernet based links relatively fewer overhead bits are transmitted compared to an ATM based link. Both the IP and Ethernet based links appear to perform better under heavy traffic load conditions. An IP based link could perform better than an Ethernet based link when an IP header compression technique is used. An Ethernet based link is an alternative transport technique for the UTRAN transport network due to its flexibility, economy and bandwidth efficiency. The HSDPA (High Speed Downlink Packet Access) is considered to be one of the initial evolutionary steps to enhance the data rate, and QoS of downlink data and multimedia services for the evolved UMTS network. It can provide high data rate up to 28.8 Mbps on the downlink shared channel using the packet access technique. A HSDPA network can dynamically adjust a connection data rate to match radio conditions to ensure the highest possible data rate for different type of traffic. Inappropriate RAN capacity allocation could lead to low radio resource or RAN resource utilizations. In this thesis, a Markov chain based analytical model has been developed to study the interaction between the air interface and the RAN for a HSDPA network. The analytical model was used to study interactions of RAN transport protocols, flow control techniques and the air interface transmission conditions. Further a simulation model was developed to investigate the relationship between the HSDPA air interface and its RAN parameters. Another important issue in the HSDPA network design is the scheduling algorithm used at the Node-B. A scheduling algorithm plays a key role in allocating a RAN’s network resources. Impacts of scheduling algorithms are studied in this work using a simulation model. Based on the study of the HSDPA air interface and its RAN parameter interactions this work has developed an adaptive resource management algorithm, which uses the measured air interface information to allocate the corresponding connection data rate on the Iub link. The developed algorithm reduces RAN resource requirements while increasing the air interface resource utilization and QoS of connections.
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Emulating 3G Network Characteristics on WiFi NetworksAlesand, Alexander January 2015 (has links)
Mobile applications should work regardless of which type of wireless interface is used, and should be able to conceal unstable connections from the user to improve user experience. Therefore, network testing is important when developing mobile applications, but it is a challenge to reproduce network conditions when using real cellular networks since the test engineer has no control over the quality of the cellular network. Existing software tools can restrict bandwidth and add latency to the connection, but these tools do not accurately emulate cellular networks. This thesis proposes a system where it is possible to shape the network traffic for connected devices to mimic the network patterns of a real cellular connection when running on a WiFi connection. The design presented in this thesis is intended for testing mobile applications under diverse 3G connection parameters, such as latency, bandwidth and other characteristics. This thesis was conducted at Spotify, a company that provides a music streaming service which is a frequent user of network data traffic. The 3G emulator was evaluated using the Spotify Android application by measuring the correlation between packet traces from a real 3G connection and the 3G emulator. This correlation was compared to the correlation between packet traces from a real 3G connection and the current network emulator at Spotify. The evaluation shows that the proposed 3G emulator outperforms the current network emulator when performing tests on the Spotify application for Android. By using this emulator, we expect the network testing to become more effective as any 3G condition can be tested with repeatable results.
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Podpora kvalitativních požadavků služeb v rádiových přístupových sítích vysokorychlostních variant mobilních sítí / Support of service quality demands in radio access networks of high speed variants of mobile networksKuruc, Jiří January 2009 (has links)
The work deals with the developmental stages (Releases) of the third generation UMTS net-works. It explains a partial improvement from Release 99 to Release 5 and Release 6 to im-prove the quality parameters of a mobile data transmission. In the practical part, there are measured qualitative parameters of the third generation networks that are available in the Czech Republic: UMTS, HSDPA, CDMA 1xEV-DO Rev.0 and Rev.A and UMTS-TDD. The measurements give reasonably achievable data rates in both directions (downlink & uplunk), a response time, quality of VoIP calls, a dispersion, a data-loss and an ability to transmit video with different data flows. The other aspects especially an availability of coverage and end-user terminals have been assessed wihin the each network. The work is supplemeted with a laboratory, which is focused on a practical comparison of the basic parameters of data transmissions of 2G and 3G networks.
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CELLULAR BROADBAND TELEMETRY OPTIONS FOR THE 21st CENTURY: Looking at broadband cellular from a telemetry perspectiveSmith, Brian J. 10 1900 (has links)
ITC/USA 2006 Conference Proceedings / The Forty-Second Annual International Telemetering Conference and Technical Exhibition / October 23-26, 2006 / Town and Country Resort & Convention Center, San Diego, California / With the recent broadband upgrades to various cellular infrastructures and the myriad new
emerging wireless broadband standards and services offered by carriers, it is often difficult to
navigate this sea of technology. In deciding the best choice for broadband telemetry applications,
one must look not only at the technology, but also at the economics, market timing, bandwidths,
legacy issues, future expandability and coverage, security, protocols, and the requirements of the
specific application. This paper reviews the technology roadmap of cellular providers keeping
these issues in perspective as they apply to TCP/IP data for images, audio, video, and other
broadband telemetry data using CDMA 1xRTT, EV-DO, and EV-DO Rev A systems as well as
GSM GPRS/EDGE, UMTS/W-CDMA, HSDPA, and HSUPA networks. Lastly, issues seen by
system integrators when using cellular channels for telemetry applications are examined, and a
case is presented for overcoming many of these issues through the use of cellular routers.
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