Universitat Politècnica de Catalunya
Now showing items 21-40 of 114
Hoy en día, entre los servicios más solicitados por los usuarios en las redes de comunicaciones, se encuentran aquellos que incorporan información multimedia. En Internet, es habitual que un gran número de páginas web ...
In this thesis the state of the art for IP networks and the two most predominant wireless access networks, UMTS and Wireless LANs, has been reviewed with respect to the enhancements required toward the objective of supporting ...
La comunicación entre redes ad hoc y redes basadas en infraestructura resulta esencial para poder extender Internet más allá de su alcance tradicional, a aquellas áreas hasta ahora inaccesibles, permitiendo la utilización ...
Las comunicaciones multipunto ofrecen, tanto a usuarios como a proveedores, mayor eficiencia, permitiendo desarrollar e implantar nuevos servicios. Para poder desplegarlos adecuadamente sobre la redes de comunicaciones, ...
Authentication and authorisation architectures based on certificates have not been widely accepted due to their cost, inflexibility and difficult management.<br/>The complexity of the Public Key Infrastructure (PKI) is ...
En esta Tesis se plantea una solución para soportar Calidad de Servicio en Internet. Esta solución, denominada IntServ6, opera sobre redes fijas y móviles basadas en el protocolo IPv6. IntServ6 está fundamentada en la ...
En los últimos años se han estado utilizando medios electrónicos para automatizar y hacer más eficientes los diferentes procesos de una elección. Aún cuando esta automatización se ha presentado de manera gradual, el propósito ...
Les xarxes d'àrea local sense fils (WLANs), principalment les basades en les diverses versions de les normes IEEE 802.11, i més concretament, aquelles operant en mode infraestructura (ús de punts d'accés o APs), són avui ...
Technology progress in both user devices and networks allows communications anytime and anywhere. New communication environments offer a wide range of possibilities to users, but also generate new threats. For this reason, ...
Location techniques that satisfy the requirements of advanced Location-Based Services (LBS) in environments where GPS fails are needed, therefore accurate indoor positioning is becoming increasingly important. This PhD ...
This thesis is a result of contributions to optimize or improve resource allocation in Passive Optical Networks (PON). The contributions are related with resource allocation during PON operation and with the upgrade process ...
P2PSIP (Peer-to-Peer Session Initiation Protocol) is a protocol developed by the IETF (Internet Engineering Task Force) for the establishment, completion and modi¿cation of communication sessions that emerges as a complement ...
La ràpida evolució d’Internet i l’àmplia gamma de noves aplicacions (per exemple, multimèdia, videoconferència, jocs en línia, etc.) ha fomentat canvis revolucionaris en la manera com ens comuniquem. A més, algunes d’aquestes ...
Next-Generation Networks (NGNs) will converge the existing fixed and wireless networks. These networks rely on the IMS (IP Multimedia Subsystem), introduced by the 3GPP. The presence service came into being in instant ...
The Wi-Fi technology has been in the recent years fostering the proliferation of attractive mobile computing devices with broadband capabilities. Current Wi-Fi radios though severely impact the battery duration of these ...
The increasing emergence of wireless applications along with the static spectrum allocation followed by regulatory bodies has led to a high inefficiency in spectrum usage, and the lack of spectrum for new services. In this ...
Key to the success of the mobile telecommunication systems is provision of mobility and more specifically, continuity of communication sessions on the move. However, from engineering point of view the cobination of scarce ...
The emergence of mobile and wireless networks made posible the extensión of electronic commerce to a new area of research: mobile commerce called m-commerce, which includes mobile payment), that refers to any e-commerce ...
Nowadays, video streaming applications are the most bandwidth-hungry applications and this tendency is envisaged to grow exponentially. With the proliferation of multimedia capable devices, multimedia services have to ...
A recommender system is an automatic system that, given a customer model and a set of available documents, is able to select and offer those documents that are more interesting to the customer. From the point of view of ...
