Offloading of cellular traffic through a wireless local area network (WLAN) is theoretically evaluated. First, empirical data sets of the locations of WLAN internet access points are analyzed and an inhomogeneous Poisson process consisting of high, normal, and low density regions is proposed as a spatial point process model for these configurations. Second, performance metrics, such as mean ava...

Wireless LAN (WLAN) location fingerprinting is an important approach for local positioning system, a complementary and alternative technology to the global positioning system (GPS). Fingerprinting is a method of localization that associates individual positions with distinct features and uses them to infer absolute locations of targets. The widespread presence of WLANs (based on IEEE 802.11 sta...

Performance measurements of four wireless systems (GSM900, GSM1800, UMTS and WLAN) simultaneously transported over an indoor wireless network fed by a low-cost 850-nm vertical-cavity surfaceemitting laser (VCSEL) – 300m length of multimode fibre is presented. The measurement focuses on the error vector magnitude (EVM) performance of the GSM900, GSM1800, and UMTS in co-existence with each other ...

Zusammenfassung: Auf der Basis von WLAN-Technologien lassen sich in lokal begrenzten Bereichen flexible und kostengünstige drahtlose Breitband-Zugangsmöglichkeiten zum Internet realisieren. Der Beitrag gibt einen Überblick über den Stand der Technik und die Zukunftsperspektiven der WLAN-Technologie. Für Office-, Campusund HotSpot-Szenarien werden unterschiedliche Architekturalternativen vorgest...

This paper proposes WLAN-based GPRS Support Node (WGSN), a solution for integrating 3G and WLAN services. We show that the 3G mechanisms can be re-used for WLAN user authentication and network access without introducing new procedures and without modifying the existing 3G network components. We describe the WGSN features and show how they are designed and implemented. A WGSN prototype has been ...

Wireless Local Area Networks (WLAN) has been enthusiastically adopted in our everyday life. However, the current WLAN systems offer very unsatisfactory level of security. Some attacking methods are more dangerous in wireless environment and some additional effort should be used to protect the security of our data in WLAN. So many researchers have been pursuing this goal. This paper presents a b...

Wireless local area network (WLAN) is a technology that combines computer network with wireless communication technology. The 2.4 GHz and 5 GHz frequency bands in the Industrial Scientific Medical (ISM) band can be used in the WLAN environment. Because of the development of wireless communication technology and the use of the frequency bands without the need for authorization, the application o...

Vertical Handoff (VHO) scheme is designed based on the interworking architecture of WLAN/WIMAX which aims to provide always the best Quality of Service (Qos) for users. The performance of applications and network conditions are considered in the handoff process. The handoff procedures are normally initiated when the stations move across the border of WLANs. As a result, both the fixed station a...

With the rapid proliferation of broadband wireless services, it is of paramount importance to understand how fast data can be sent through a wireless local area network (WLAN). Thanks to a large body of research following the seminal work of Bianchi, WLAN throughput under saturated traffic condition has been well understood. By contrast, prior investigations on throughput performance under unsa...