The future beyond third generation (B3G) or fourth generation (4G) systems will consist of different radio access technologies, such as GSM/GPRS, UMTS, WiFi, and WiMAX. Many intensive efforts have been made to identify the unsolved issues about the future mobile systems, and one important issue is what the future vertical handover management solution will be. A variety of mobility management so...

This paper contains an exploration of how Wireless Fidelity (WiFi), or 802.11 standards, have changed over the years. It reviews the different technologies and procedures that have been implemented, such as data encoding, bandwidth modulation, encryption, data integrity preservation, and special streaming. It also addresses the benefits and costs associated with current and future generation st...

These images were created using a " Wifi Camera " custom designed by Somlai-Fischer, Sjölén and Haque (information available at ). It makes a use of a directional 2.4Ghz wifi antenna mounted on servos scanning an environment at varying resolutions, measuring signal strength of all present networks to generate an image of the wifi " view " of the space. A ...

Wireless Fidelity (WiFi) network is based on the IEEE 802.11 standard. Worldwide Interoperability for Microwave Access (WiMAX), based on IEEE 802.16, is a standard with similar principles. The main advantage of WiMAX over WiFi is that it covers larger areas and has higher data rates. WiMAX network operators provide WiMAX subscriber units that enable connection to the metropolitan WiMAX network ...

WiFi offloading has been recently proposed as a cost-effective solution for coming up against the unprecedented increase in the mobile data traffic volume. However, apart from reducing the operational costs of a network operator, WiFi offloading can be also promoted as an alternative low-cost access service for users with low willingness-to-pay. In this paper, we consider a monopolistic scenari...

WiFi offloading is envisioned as a promising solution to the mobile data explosion problem in cellular networks. WiFi offloading for moving vehicles, however, poses unique characteristics and challenges, due to high mobility, fluctuating mobile channels, etc. In this paper, we focus on the problem of WiFi offloading in vehicular communication environments. Specifically, we discuss the challenge...

isting ones. Convergence of WiFi and cell technologies in a single handset will enable pervasive access to voice and data indoors and out with one standard,one network,and one device. Most cell-phone manufacturers, including Nokia and Motorola, are introducing dual-mode handsets sporting cellular and WiFi interfaces. An April 2004 report from onworld.com forecasts 400 million WiFi-enabled hands...

The increasing demand for flexibility in WiFi network deployments along with more stringent requirements on performance and security stand in stark contrast to today’s ossified and expensive WiFi architecture. In particular, today’s WiFi networks consists of a large number of control and data plane network functions that are either bundled into a single access controller running on proprietary ...

WiMAX and WiFi are considered as the promising broadband access solutions for wireless MANs and LANs, respectively. In the recent works WiMAX is considered suitable as a backhaul service to connect multiple dispersed WiFi „hotspots‟. Hence a new integrated WiMAX/WiFi architecture has been proposed in the literatures. In this paper the performances of integrated WiMAX/WiFi network have been inve...

Zone-level occupancy counting is a critical technology for smart buildings and can be used for several applications such as building energy management, surveillance, and public safety. Existing occupancy counting techniques typically require installation of large number of occupancy monitoring sensors inside a building as well as an established network. In this study, in order to achieve occupa...