Resumen-El artículo describe las redes 4G y muestra un mapa general de su desarrollo tecnológico. Adicionalmente se muestran dos temas que son clave en el desarrollo de este tipo de redes. Estos temas son el Handover Vertical y la convergencia hacia IP. La revisión expuesta muestra el estado del arte y los antecedentes de estos temas. Con base en esto se genera un mapa conceptual en el que se considera la variedad de tecnologías que convergen en el esquema 4G.Palabras clave-Redes 4G, handoff vertical, Handover Vertical, IP Móvil.Abstract-This paper describes what the 4G networks are and depicts a technologies' general map of its development. Furthermore it shows two topics that are important in these networks' development. These topics are vertical handover and IP convergence. The depicted survey by this paper shows the state of the art and the background of these topics that generate a useful mental map due to technologies' variety that is converging in the 4G scheme.
This paper describes the necessity, the algorithm, how it works and the performance of a novel model of hand-off for heterogeneous networks that is different from the methods used in the traditional homogeneous networks. The heterogeneous networks are networks that combine two or more technologically different networks. The necessity of a new hand-off method comes with the 4G networks where the traditional methods are not enough to obtain a good performance. For that reason, the designed algorithm measures the quality of service and is named MQoS (Measure of QoS). We did simulations of heterogeneous network that combine UMTS and Wi-Fi networks with the simulation tool J-sim and using our algorithm and we compared the result of them with simulations of hand-off algorithms based in the Received Signal Strength Indicator RSSI. The RSSI is a parameter that is traditionally used by homogeneous networks.
El artículo describe las redes 4G y muestra un mapa general de su desarrollo tecnológico. Adicionalmente se muestran dos temas que son clave en el desarrollo de este tipo de redes. Estos temas son el Handover Vertical y la convergencia hacia IP. La revisión expuesta muestra el estado del arte y los antecedentes de estos temas. Con base en esto se genera un mapa conceptual en el que se considera la variedad de tecnologías que convergen en el esquema 4G.
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