Today, the vast majority of personal communication devices, such as laptops, smartphones, and logically wireless fidelity (Wi-Fi) access points feature IEEE 802.11 chipsets. In turn, wake-up radio (WuR) systems are used to reduce the significant energy waste that wireless devices cause during their idle communication mode. A novel WuR system is introduced that enables any IEEE 802.11-enabled device to be used as a WuR transmitter without requiring any hardware modification. The corresponding developed WuR receiver achieves a remarkably low power consumption of 10.8 µW and operates in the Wi-Fi 2.4 GHz band. By means of thorough physical tests, it is shown that the proposed IEEE 802.11-based WuR system enables important energy savings.
Wireless Local Area Networks have been increasingly deployed and become very popular. They offer important advantages such as the higher flexibility and user mobility, however, this kind of networks also present some security concerns due to its broadcast nature. Security mechanisms can be classified into two groups: user authentication and data confidentiality.; The IEEE 802.11i specification presents RSNA authentication mechanism, which allows user authentication employing IEEE 802.1x protocol and EAP methods. Authentication mechanisms consist in an important step of the handoff process, which occurs when a mobile node leaves the coverage area of an access point and performs association with another. Handoff results in a critical function for IEEE 802.11 MAC operation due to important delay restrictions. Thus, pre-authentication and IEEE 802.11r mechanisms have been presented to allow important latency reduction, which provide interesting results in real time communications.; Besides, usually, WLAN users employ mobile devices, which provide limited capabilities in terms of energy management.; In this way, in this paper, we evaluate authentication latency and battery consumption by means of an analytical model that we have developed for this purpose. The analysis also includes the influence of transmission errors, which allows the evaluation of authentication mechanisms in error-prone scenarios. (C) 2014 Elsevier B.V. All rights reserved.
Garcia-Villegas, E.; Gomez, M.; Lopez-Aguilera, E.; Casademont, J. International Wireless Communications and Mobile Computing Conference p. 57-61 DOI: 10.1145/1815396.1815410 Presentation of work at congresses
IEEE 802.11 Wireless LANs (WLANs) are highly sensitive to Denial of Service (DoS) attacks carried out with jamming devices. In this paper we focus on 2.4GHz wideband constant jammers. The interest in the wideband jammer lies in the fact that it beats all
possible channels at the same time, leaving no possible escape following traditional channel-switching defenses. After studying
and developing an effective detection mechanism, we propose the implementation of a load balancing technique based on cell
breathing for mitigating the harmful effects of the jammer over an IEEE 802.11 WLAN. Cell breathing is achieved by dynamically tuning the transmission power to adjust the size of a WLAN cell.
Lopez-Aguilera, E.; Heusse, M.; Grunenberger, Y.; Rousseau, F.; Duda, A.; Casademont, J. IEEE transactions on mobile computing Vol. 7, num. 10, p. 1213-1227 Date of publication: 2008-10 Journal article
Garcia-Villegas, E.; Lopez-Aguilera, E.; Vidal, R.; Paradells, J. Second International Conference on Cognitive Radio Oriented Wireless Networks and Communications p. 1-8 Presentation of work at congresses
Lopez-Aguilera, E.; Casademont, J.; Cotrina, J.; Rojas, A. IEEE International Symposium on Personal Indoor and Mobile Radio Communications p. 1463-1467 Presentation's date: 2005-09-01 Presentation of work at congresses
Lopez-Aguilera, E.; Casademont, J.; Rojas, A.; Cotrina, J. The IASTED International Conference on Wireless Networks and Emerging Technologies Presentation's date: 2005-07-01 Presentation of work at congresses