R. Rivera–Rodríguez*1,2, O. E. Olivares–Domínguez2, A. Serrano–Santoyo3
1 Universidad Autónoma de Baja California Facultad de Ingeniería, Campus Mexicali Obregón y Julián Carrillo s/n C.P. 21100 Mexicali, Baja California Norte, México *rrivera@cicese.mx
2 Centro de Investigación Científica y de Educación Superior de Ensenada CICESE División de Física Aplicada, Departamento de Electrónica y Telecomunicaciones Carretera Ensenada–Tijuana 3918 Zona Playitas C. P. 22860 Ensenada, Baja California, México.
3 Centro de Investigación Científica y de Educación Superior de Ensenada CICESE Dirección de Impulso a la Innovación y Desarrollo Carretera Ensenada–Tijuana 3918 Zona Playitas C. P. 22860 Ensenada, Baja California, México.
ABSTRACT
]]> Videoconferencing transmission over wireless channels presents relevant challenges in mobile scenarios at vehicular speeds. Previous contributions are focused on the optimization of the transmission of multimedia and delay–sensitive applications over the forward link. In this paper, a new Quality of Service (QoS) parameter adaptation scheme is proposed. This scheme applies the Cross–Layer Design technique on the reverse link of an 1xEV–DO Revision 0 channel. As the wireless channel parameters and the vehicle speed have significant influence in the network layer packet loss rate, it is proposed that the data rate generated by the application adapts itself to the throughput offered by the lower layers as a function of such packet loss rate. Simulations of the proposed model show a significant reduction in losses caused by wireless channel impairments and vehicle mobility, resulting in an improvement in the performance of the mobile videoconferencing session.Keywords: Cross–Layer Design, EV–DO, Mobile videoconferencing, QoS, Reverse Link.
RESUMEN
La transmisión de videoconferencia sobre canales inalámbricos presenta desafíos relevantes en escenarios móviles a velocidades vehiculares. Las contribuciones previas están enfocadas a optimizar la transmisión de aplicaciones multimedia y sensibles al retardo sobre el canal descendente. En este artículo se propone un nuevo esquema de adaptación de parámetros de Calidad de Servicio. Este esquema aplica la técnica del Diseño Entre Capas en el enlace ascendente de un canal 1xEV–DO Revisión 0. Como los parámetros del canal inalámbrico y la velocidad del vehículo tienen influencia significativa en la tasa de pérdida de paquetes de capa de red, se propone que la tasa de datos generada por la aplicación se adapte al caudal eficaz ofrecido por las capas inferiores en función de dicha tasa de pérdida de paquetes. Simulaciones del modelo propuesto, muestran una reducción significativa en las pérdidas ocasionadas por las características del canal inalámbrico y la movilidad del vehículo, dando como resultado una mejora en el desempeño de la sesión de videoconferencia móvil.
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