Application of MIH for the Lightweight Deployment of LTE-Advanced Systems through Mobile Relaying

[ES] Evaluación del uso de relays móviles Wifi en tecnología LTE-Advanced[EN] Evaluation of Wifi Mobile Relaying in LTE-Advanced SystemsGualda Romero, P. (2012). Application of MIH for the Lightweight Deployment of LTE-Advanced Systems through Mobile Relaying. http://hdl.handle.net/10251/27176.Archivo delegad

Application of MIH for the lightweight deployment of LTE-advanced systems through mobile relaying

In a conventional cellular network end users connect directly to a Base Station (BS). Mobile relaying allows establishing an indirect two-hop link between the end user, called Mobile Node (MN), and the BS through a Mobile Relay (MR). This spreads out the cell coverage and increases the cell-edge throughput hence improving fairness among nodes. This article is focused on a Long Term Evolution Advanced (LTE-A) cellular network where MNs and MRs are connected through a Wireless Fidelity (WiFi) ad-hoc connection. It is proposed the use of Media Independent Handover (MIH) signaling to define an efficient dynamic routing mechanism for MR in this framework. The proposed mechanism, called MIH-Driven Relay Selection Mechanism (MIDRES), detects which is the best direct or indirect link with the BS based on information collected using MIH messages. The MNs or MRs send MIH messages when experiencing bad channel conditions, that is detected thanks to predefined thresholds. Then, the BS starts a polling process, again supported by MIH signaling, and performs optimal route selection either through the LTE-A radio interface or through a WiFi ad-hoc interface. This article examines the implementation of this mechanism and obtains the optimal thresholds that maximize operational performance. Moreover, the potential benefit of this LTE-compliant mobile relaying solution is evaluated using a calibrated simulation tool. The results show significant savings in cost of network deployment.The work of David Martin-Sacristan was supported by a FPU grant of the Spanish Ministry of Education.Cabrejas Peñuelas, J.; Gualda Romero, P.; Monserrat Del Río, JF.; Martín-Sacristán Gandía, D. (2012). Application of MIH for the lightweight deployment of LTE-advanced systems through mobile relaying. 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IEEE Trans Commun 2010., 58:Vanganuru K, Puzio M, Sternberg G, Shah K, Kaur S: Uplink system capacity of a cellular network with cooperative mobile relay. Proceedings of the Wireless Telecommunications Symposium 2011, 1-7.Li Z, Shen H: Game theoretic analysis of cooperation incentive strategies in mobile ad-hoc networks. IEEE Trans Mobile Comput 2011. doi: 10.1109/TMC.2011.151IEEE 802.21, Draft standard for local and metropolitan area networks: media independent handover services. IEEE P802.21 (D9.0), 2008 IEEE P802.21 D9.0 2008Bae SJ, Chung MY, So J: Handover triggering mechanism based on IEEE 802.21 in heterogeneous networks with LTE and WLAN. Proceedings of the International Conference on Information Networking (ICOIN) 2011, 399-403.Seol J, Chung J: IEEE 802.21 MIH based Handover for Next Generation Mobile Communication Systems. 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Accessed 20 March 2012 [ http://projects.celtic-initiative.org/winner+/WINNER+%20Evaluation%20Group.html ]Green DB, Obaidat AS: AS Obaidat, An accurate line of sight propagation performance model for ad-hoc 802.11 wireless LAN (WLAN) devices. Proceedings of the IEEE International Conference on Communications (ICC 2002) 2002, 5: 3424-3428.Johnson DB, Maltz DA, Imielinski T, Korth H: Dynamic source routing in ad hoc wireless networks, Chap. 5. In Mobile Computing. Kluwer Academic Publishers, The Netherlands; 1996:153-181.WiMAX Forum: A Comparative Analysis of Spectrum Alternatives for WiMAX Networks with Deployment Scenarios Based on the U.S. 700 MHz Band. Wimax Forum Website 2008.Forge S, Blackman C, Bohlin E: The demand for future mobile communications markets and services in Europe. 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Analysis of aberrations effect in nonlinear processes for femtosecond laser pulses

A method for the analysis and control of femtosecond pulse wavefronts generated in non-linear crystals by three-wave mixing processes is presented. The possibility to improve the efficiency of these processes is discussed.Postprint (published version

Actitudes hacia la práctica de actividad físico-deportiva orientada a la salud en adolescentes españoles: Estudio AVENA

the aim of this study was to know the attitudes toward the physical activity and sport practice oriented to health in a representative sample of Spanish adolescents. A descriptive cross-sectional study was implemented and the survey about behaviours, attitudes and values related to physical activity and sport practice developed in the AVENA study was used. The sample size was 2859 Spanish students from public and private secondary schools in 5 Spanish cities: Granada, Madrid, Murcia, Santander and Zaragoza. The main results verify that both boys and girls have a greater orientation towards process-related attitudes (PA) of physical activity and sport that outcome-related attitudes (AR) of the practice. In boys and girls, both AP and AR both genders, there is a progressive decrease when increasing the age. Adolescents who engaged in physical activity had higher levels of attitudes than non-practitioners. In conclusion, AP became more important than AR in young adolescents; both AP and AR were higher in boys than in girls and attitude values decreased with increasing age. The knowledge of attitudes might allow to develop effective and long-term successful intervention programmes for adopting healthy lifestyles in the current young peopleel objetivo del estudio se centra en conocer las actitudes hacia la práctica de actividad físico deportiva orientada a la salud en una muestra representativa de adolescentes españoles. Para ello, se ha efectuado un estudio descriptivo de corte transversal, empleando la encuesta sobre comportamientos, actitudes y valores sobre actividad física y deportiva del Grupo AVENA. El análisis descriptivo e inferencial, nos permite obtener la opinión de 2.859 estudiantes, procedentes tanto de centros públicos como privados de cinco ciudades españolas: Granada, Madrid, Murcia, Santander y Zaragoza. Los principales resultados verifican que tanto chicos como chicas presentan una mayor orientación hacia actitudes relacionadas con el proceso (AP) de la actividad físico-deportiva que hacia actitudes referidas al resultado (AR) de dicha práctica. En ambos sexos, se produce una disminución progresiva en dicha orientación, tanto en las AP como en las AR, conforme aumenta la edad. En aquellos adolescentes que practican actividad física, la orientación hacia las actitudes es mayor que en adolescentes no practicantes. Como conclusión, las AP adquieren mayor importancia que las AR en los jóvenes adolescentes, siendo ambas mayores en chicos respecto a chicas y disminuyendo los valores de ambas conforme aumenta la edad. El conocimiento facilitado en este trabajo podría servir de apoyo para perfeccionar las diversas estrategias de promoción de la salud sobre las que asentar la adquisición de nuevos estilos de vida entre la población joven de una forma estable y durader

Profesorado : revista de curriculum y formación del profesorado

Resumen basado en el de la publicaciónSe pretende conocer los motivos de práctica de la actividad físico-deportiva en una muestra representativa de adolescentes españoles. Para ello, se efectuó un estudio descriptivo de corte transversal y se empleó la encuesta sobre comportamientos, actitudes y valores sobre actividad física y deportiva del Grupo AVENA (Alimentación y Valoración del Estado Nutricional en Adolescentes). La muestra estuvo formada por 2.859 estudiantes, procedentes de centros públicos y privados de cinco ciudades españolas: Granada, Madrid, Murcia, Santander y Zaragoza. Los resultados indican que la diversión, la realización de ejercicio físico, estar con los amigos y el gusto hacia la práctica son los principales motivos señalados para realizar actividad físico-deportiva en el tiempo libre. El género y la edad modifican significativamente los motivos de práctica físico-deportiva. Se concluye que el conocimiento de los motivos de práctica podría permitir desarrollar programas de intervención eficaces y duraderos en la adopción de estilos de vida saludables en los jóvenes.AndalucíaES