E. Stevens-Navarro*1, J. D. Martínez-Morales2, U. Pineda-Rico3
1,3 Facultad de Ciencias, Universidad Autónoma de San Luis Potosí Av. Dr. Salvador Nava Martínez S/N, Zona Universitaria, 78290 San Luis Potosí, San Luis Potosí, México, *estevens@galia.fc.uaslp.mx.
2 Centro de Investigación y de Estudios de Posgrado, Facultad de Ingeniería, Universidad Autónoma de San Luis Potosí, Av. Dr. Manuel Nava No. 8, Zona Universitaria, 78290, San Luis Potosí, San Luis Potosí, México.
ABSTRACT
In the forthcoming heterogeneous wireless environment, the mobility management of users roaming between different wireless access technologies is a challenging and important technical issue. New mobile devices such as netbooks, smartphones and tablets allow users to perform vertical handoffs among different wireless networks. The multiple attribute decision making (MADM) methods are suitable tools to model and study the vertical handoff process. Hence, recently several MADM methods such as SAW, MEW, TOPSIS, GRA, ELECTRE, VIKOR and WMC have been proposed for vertical handoff. In this paper, we present an extensive performance evaluation and comparative study of the seven MAMD methods by means of numerical simulations in MATLAB. We evaluate the performance of each vertical handoff method under different applications such as voice, data, and cost-constrained connections. We also perform a sensitivity analysis and evaluate the computational complexity of each method in terms of number of floating point operations.
Keywords: vertical handoff, multiple attribute decision making, heterogeneous networks
]]>RESUMEN
En los próximos ambientes inalámbricos heterogéneos, la gestión de movilidad de los usuarios alternando entre diferentes tecnologías de acceso inalámbrico es un tema técnico muy importante y desafiante. Los nuevos dispositivos móviles como son las computadoras portátiles, teléfonos inteligentes y tabletas permiten a los usuarios móviles realizar traspasos verticales entre diferentes redes inalámbricas. Los métodos de decisión por atributos múltiples (MADM) son una herramienta adecuada para modelar y estudiar el proceso del traspaso vertical. Por lo tanto, recientemente se han propuesto algunos métodos MADM como SAW, MEW, TOPSIS, GRA, ELECTRE, VIKOR y WMC para el traspaso vertical. En este artículo, se presenta una evaluación de desempeño exhaustiva así como un estudio comparativo de los siete métodos MADM por medio de simulaciones numéricas en MATLAB. Se evalúa el desempeño de cada método de traspaso vertical bajo diferentes tipos de conexiones como voz, datos y costo restringido. Se realiza también un análisis de sensibilidad y se evalúa la complejidad computacional de cada método en términos del número de operaciones de punto flotante.
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