Matee

ISSN 1870-9532

Junio 2009 Volumen 6 Número 1

RIEE&C

Revista de Ingeniería Eléctrica, Electrónica y Computación
Revista publicada por el Departamento de Ingeniería Eléctrica y Electrónica del Instituto Tecnológico de Sonora

ITSON – Instituto Tecnológico de Sonora
5 de Febrero 818 Sur. C.P. 85000 Ciudad Obregón, Sonora, México.

RIEE&C: Revista de Ingeniería Eléctrica, Electrónicay Computación
Año 5, Volumen 6, Número 1, Junio de 2009. DERECHOS RESERVADOS  2009. ISSN: 1870-9532

Publicación semestral editada por ITSON a través del Departamento de Eléctrica y Electrónica. Esta publicación fue completada en Junio de 2009.

Editor en jefe: José Antonio Beristáin Jiménez Grupo editor ejecutivo: José M. Campoy S., Rafael León V., Javier Pérez R., Juan C. Murrieta L.,Manuel Domitsu K., Griselda González D. C. Editores asociados: Adolfo Espinoza R., Adolfo Soto C., Andrés O. Pizarro L., Armando Ambrosio L., Armando García B., Eduardo Romero A., Enrique Aragón M., Erica Ruiz I., Gabriel Nuñez R., Jesús H. Hernández L., Ismael Murillo V., Joaquín Cortéz G., Juan J. Padilla Y., Moisés Rodríguez E., Raymundo Márquez B. Diseño de portada: Jessica Beltrán MárquezContacto: rieeandc@itson.mx Internet: http://www.itson.mx/rieeandc. Impreso en el taller del Instituto Tecnológico de Sonora. Fecha de Impresión Agosto 2009. Tiraje de 200 ejemplares con 10 hojas.

El contenido de los artículos que se publican son responsabilidad de los autores. Prohibida la reproducción total o parcial del contenido de la revista, en cualquier medio, sin previa autorización porescrito del editor. Quedan reservados todos los derechos.

RIEE&C, REVISTA DE INGENIERÍA ELÉCTRICA, ELECTRÓNICA Y COMPUTACIÓN, Vol. 6 No. 1, JUNIO 2009

1

User Mobility Characterization in Mobile Cellular Systems with Differentiated Quality Coverage Zones
Vázquez Á. José L., Cruz P. Felipe A., Sánchez L. Rafael and Méndez M. Francisco
quality while offering greater protection to those mobilesthat require it. The goal is to produce an overall SIR distribution that satisfies reception quality constraints while bringing about a general increase in system capacity. The available channels are split among several reuse patterns with different reuse factors. Mobile units with the best received signal quality will be preferentially assigned to the group of channels having the smallest reusefactor, while those with the poorest received signal quality will be only assigned to the group of channels having the largest reuse factor value. CBWL is a family of channel assignment and sharing methods for cellular communications [2]-[3]. As in Fixed Channel Assignment (FCA), each cell is assigned a group channels (nominal channels) which are reused at cells that are sufficiently distant forthe co-channel interference to be tolerable. In CBWL, if all nominal channels of a cell are occupied when a call arrives, channels can be borrowed from the neighbors. Channels can be borrowed only from an adjacent cell and are used with reduced transmitted power such that co-channel interference caused by channel borrowing is not worse than that of a non-borrowing scheme. The borrowed channels canbe accessed only in part of the cell. To determine whether a MS is in the region that can be served by a borrowed channel, each cell transmits a Borrowed Channel Sensing Signal (BCSS) with the same reduced power as that on a borrowed channel. If the BCSS is above suitable threshold at a MS, a borrowed channel can be used by the MS. Thus, there are two zones in a cell: a zone where borrowed channelscan be used and a zone where borrowed channels cannot be used. Another possible way of improving capacity of cellular networks is to use different combinations of speech/channel coding, depending on the communication channel conditions. Such an approach has recently received lots of interest and has driven the development of Adaptive MultiRate (AMR) codecs family [8]. In AMR there are eight...