Wireless local area networks (WLANs) are commonplace in many universities. Understanding the trends in the usage of these networks is becoming more important. Interesting results can be extracted about association patterns by analyzing WLAN traces from real scenarios. In this work, the library in the main campus of the Technical University of Catalonia (UPC) in Barcelona has been studied. Daily...

Analysis and Design of Microstrip Patch antenna for a digital communication system For Narrow Band (DCS)/2.4-GHz and 5.5 GHz WLAN-Band Triple Band frequencies application is presented. The two resonant modes of the proposed antenna are associated with various arms of the monopoles, in which a rectangular resonator contributes for the 5.5 GHz WLAN resonant frequency and two various arms are resp...

In this work, we measure Wireless Local Area Network (WLAN) voice performance and capacity. While most WLAN applications today are data centric, the growing popularity of Voice over IP (VoIP) applications and the trend towards convergence with cellular networks will catalyze increased voice traffic. Since voice applications compete not only with each other, but also with data applications for W...

This paper presents a combination of Free Space Optic systems with WLAN and Satellite Communications to provide Video conferencing and data transfer for use in Civil Military Cooperation and disaster recovery applications. A modular communication system developed at TU Graz is described, which facilitates worldwide access to the Internet or any other network (depending on the particular applica...

The presented paper exhibits the design configuration of Microstrip Line (MS)-fed and Co-Planar Waveguide (CPW)-fed symmetrical staircase shaped, planar monopole Ultra Wideband (UWB) antennae with WLAN band rejection characteristic having sized 30x30x1.6mm. The staircase pattern in the radiating patch and the feed line’s Ushaped slot are used to achieve the UWB and notch the 5GHz WLAN band, res...

0140-3664/$ see front matter 2010 Elsevier B.V. A doi:10.1016/j.comcom.2010.09.008 ⇑ Corresponding author. Address: 1001 University ROC. Tel.: +886 3 5712121x54717; fax: +886 3 57214 E-mail addresses: [email protected] (S.-L. Tsao Huang). In recent years, IEEE 802.11 wireless local area networks (WLANs) have been widely deployed, and more and more mobile devices have built-in WLAN interface...

We consider a mobile user in an environment characterized by a cellular network with whole coverage and isolated Wireless-LAN (WLAN) access points. Downloading a file from the Internet, the user is often confronted with the need to come to a decision whether to handover from the cellular system to a WLAN access point. For offthe-shelf Mobile-IP configurations we show that the overall performanc...

The rapid evolution of wireless and mobile communication technologies raises the challenge of satisfying different technology features in a unified architecture. For example, while WLAN technologies provide QoS and high data rates, they lack the wide coverage and powerful mobility management supported by UMTS. On the other hand UMTS users suffer from lower QoS compared to WLAN. Looking at the c...

Voice over Internet Protocol (VoIP) is a form of voice communication that uses audio data to transmit voice signals to the end user. VoIP is one of the most important technologies in the World of communication. Around, 20 years of research on VoIP, some problems of VoIP are still remaining. During the past decade and with growing of wireless technologies, we have seen that many papers turn thei...

This paper discusses new mobile usage scenarios for WLAN technologies and presents an architecture that is based on the notion of intermittent connectivity instead of seamless connectivity. The Drive-thru Internet approach is intended to support Internet applications of mobile users in environments where no permanent connectivity is available, a common case for nomadic users. We have chosen the...