284 research outputs found
Power control for WCDMA
This project tries to introduce itself in the physical implementations that make
possible the denominated third generation mobile technology. As well as to
know the technology kind that makes possible, for example, a video-call in real
time.
During this project, the different phases passed from the election of WCDMA
like the access method for UMTS will appear. Its coexistence with previous
network GSM will be analyzed, where the compatibility between systems has
been one of the most important aspects in the development of WCDMA, the
involved standardization organisms in the process, as well as the different
protocols that make the mobile communications within a network UTRAN
possible. Special emphasis during the study of the great contribution that has
offered WCDMA with respect to the control of power of the existing signals will
be made.
The future lines that are considered in the present, and other comment that
already are in their last phase of development in the field of the mobile
technology.
UMTS through WCDMA can be summarized like a revolution of the air
interface accompanied by a revolution in the network of their architecture
The strategies associated with the migration of networks to 4G
The networks need to provide higher speeds than those offered today.
For it, considering that in the spectrum radio technologies is the scarcest resource in the development of these technologies and the new developments is essential to maximize the performance of bits per hertz transmitted. Long Term Evolution optimize spectral efficiency modulations with new air interface, and more advanced algorithms radius. These capabilities is the fact that LTE is an IPbased
technology that enables end-to-end offer high transmission
rates per user and very low latency, ie delay in the response times of the network around only 10 milliseconds, so you can offer any realtime application.
LTE is the latest standard in mobile network technology and 3GPP ensure competitiveness in the future, may be considered a technology bridge between 3G networks - current 3.5G and future 4G networks, which are expected to reach speeds of up to 1G .
LTE operators provide a simplified architecture but both robust, supporting services on IP technology. The objectives to be achieved through its implementation are ambitious, first users have a wide range of added services like capabilities that currently enjoys with residential broadband access at competitive prices, while the operator
will have a network fully IP-based environment, reducing the
complexity and cost of the same, which will give operators the opportunity to migrate to LTE directly.
A major advantage of LTE is its ability to fuse with existing networks, ensuring interconnection with the same, increasing his current coverage and allowing a data connection established by a user in the environment continue when fade the coverage LTE. Moreover, the operator has the advantage of deploying network gradually, starting initially at areas of high demand for broadband services and expand progressively in line with this.
RESUMEN.
Las redes necesitan proporcionar velocidades mayores a las ofertadas a dĂa de hoy. Para ello, teniendo en cuenta que en tecnologĂas radio el espectro es el recurso mĂĄs escaso, en la evoluciĂłn de estas tecnologĂas y en los nuevos desarrollos es esencial maximizar el rendimiento de bits por hercio transmitido. Long Term Evolution optimiza la eficiencia espectral con nuevas modulaciones en la
interfaz aire, asĂ como los algoritmos radio mĂĄs avanzado. A estas capacidades se suma el hecho de que LTE es una tecnologĂa basada en IP de extremo a extremo que permite ofrecer altas velocidades de transmisiĂłn por usuario y latencias muy bajas, es decir, retardos en los tiempos de respuesta de la red en torno a sĂłlo 10 milisegundos, por lo que permite ofrecer cualquier tipo de aplicaciĂłn en tiempo
real.
LTE es el Ășltimo estĂĄndar en tecnologĂa de redes mĂłviles y asegurarĂĄ la competitividad de 3GPP en el futuro, pudiendo ser considerada una tecnologĂa puente entre las redes 3G â 3.5G actuales y las futuras redes 4G, de las que se esperan alcanzar velocidades de hasta 1G.
LTE proporcionarĂĄ a las operadoras una arquitectura simplificada pero robusta a la vez, soportando servicios sobre tecnologĂa IP. Los objetivos que se persiguen con su implantaciĂłn son ambiciosos, por una parte los usuarios dispondrĂĄ de una amplia oferta de servicios añadidos con capacidades similares a las que disfruta actualmente con
accesos a banda ancha residencial y a precios competitivos, mientras que el operador dispondrĂĄ de una red basada en entorno totalmente IP, reduciendo la complejidad y el costo de la misma, lo que darĂĄ a las operadoras la oportunidad de migrar a LTE directamente.
Una gran ventaja de LTE es su capacidad para fusionarse con las redes existentes, asegurando la interconexiĂłn con las mismas, aumentando su actual cobertura y permitiendo que una conexiĂłn de datos establecida por un usuario en el entorno LTE continĂșe cuando la cobertura LTE se desvanezca. Por otra parte el operador tiene la ventaja de desplegar la red LTE de forma gradual, comenzando inicialmente por las ĂĄreas de gran demanda de servicios de banda ancha y ampliarla progresivamente en funciĂłn de Ă©sta
Power control for WCDMA
This project tries to introduce itself in the physical implementations that make
possible the denominated third generation mobile technology. As well as to
know the technology kind that makes possible, for example, a video-call in real
time.
During this project, the different phases passed from the election of WCDMA
like the access method for UMTS will appear. Its coexistence with previous
network GSM will be analyzed, where the compatibility between systems has
been one of the most important aspects in the development of WCDMA, the
involved standardization organisms in the process, as well as the different
protocols that make the mobile communications within a network UTRAN
possible. Special emphasis during the study of the great contribution that has
offered WCDMA with respect to the control of power of the existing signals will
be made.
The future lines that are considered in the present, and other comment that
already are in their last phase of development in the field of the mobile
technology.
UMTS through WCDMA can be summarized like a revolution of the air
interface accompanied by a revolution in the network of their architecture
Technology Assessment for the Future Aeronautical Communications System
To address emerging saturation in the VHF aeronautical bands allocated internationally for air traffic management communications, the International Civil Aviation Organization (ICAO) has requested development of a common global solution through its Aeronautical Communications Panel (ACP). In response, the Federal Aviation Administration (FAA) and Eurocontrol initiated a joint study, with the support of NASA and U.S. and European contractors, to provide major findings on alternatives and recommendations to the ICAO ACP Working Group C (WG-C). Under an FAA/Eurocontrol cooperative research and development agreement, ACP WG-C Action Plan 17 (AP-17), commonly referred to as the Future Communications Study (FCS), NASA Glenn Research Center is responsible for the investigation of potential communications technologies that support the long-term mobile communication operational concepts of the FCS. This report documents the results of the first phase of the technology assessment and recommendations referred to in the Technology Pre-Screening Task 3.1 of AP-17. The prescreening identifies potential technologies that are under development in the industry and provides an initial assessment against a harmonized set of evaluation criteria that address high level capabilities, projected maturity for the time frame for usage in aviation, and potential applicability to aviation. A wide variety of candidate technologies were evaluated from several communications service categories including: cellular telephony; IEEE-802.xx standards; public safety radio; satellite and over-the-horizon communications; custom narrowband VHF; custom wideband; and military communications
Soft handover issues in radio resource management for 3G WCDMA networks
PhDMobile terminals allow users to access services while on the move. This unique
feature has driven the rapid growth in the mobile network industry, changing it from a
new technology into a massive industry within less than two decades.
Handover is the essential functionality for dealing with the mobility of the mobile
users. Compared with the conventional hard handover employed in the GSM mobile
networks, the soft handover used in IS-95 and being proposed for 3G has better
performance on both link and system level.
Previous work on soft handover has led to several algorithms being proposed and
extensive research has been conducted on the performance analysis and parameters
optimisation of these algorithms. Most of the previous analysis focused on the uplink
direction. However, in future mobile networks, the downlink is more likely to be the
bottleneck of the system capacity because of the asymmetric nature of new services,
such as Internet traffic.
In this thesis, an in-depth study of the soft handover effects on the downlink
direction of WCDMA networks is carried out, leading to a new method of optimising
soft handover for maximising the downlink capacity and a new power control
approach
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