The growing interest in wireless systems and networks has led to the first Wireless LAN (WLAN) protocols. The Medium Access Control (MAC) layer protocols of such protocol suites are of key importance. The Radio Equipment and Systems (RES) Technical Committee of the European Telecommunications Standards Institute has proposed the High PErformance Radio LAN (HIPERLAN) protocol suite. In this pape...

In the context of wireless user’s increasing demands for better device power and battery management, this paper investigates some factors that can impact the power consumption on the energy consumption of mobile devices. The focus is on two factors when performing multimedia streaming: the impact of the traffic location within a WLAN; and the impact of the radio access network technology (WLAN,...

The growing interest in wireless systems and networks has led to the first Wireless LAN (WLAN) protocols. The Medium Access Control (MAC) layer protocols of such protocol suites are of key importance. The Radio Equipment and Systems (RES) Technical Committee of the European Telecommunications Standards Institute has proposed the High PElfonnance Radio LAN (HIPERLAN) protocol suite. In this pape...

UMTS (Universal Mobile Telecommunications System) is the most expanding mobile technology nowadays. Evolution of networks proceeds with improvement of the core network and with integration of alternative wireless access networks. To improve present communication systems, an UMTS standard compliant simulation environment is essential. This paper introduces an UTRAN (UMTS Terrestrial Radio Access...

This M-file analyzes an Institute of Electrical and Electronics Engineers (IEEE) 802.11 Machine Access Control (MAC) layer channel in which multiple nonsaturated stations compete for access to a single access point (AP). The M-file allows the user to model various effects at the physical (PHY) layer, including effects of fading, path loss, and shadowing. The function SNRcdf() performs the PHY l...

Collaborations between the IEEE 802.11 and the IEEE 802.16 networks operating in a common spectrum offers dynamic allocate bandwidth resources to achieve improved performance for network applications. This paper studies the bandwidth resource allocation of collaborative IEEE 802.11 and IEEE 802.16 networks. Consider delivering data packets between mobile stations and Internet users through an a...

The increasing demand for broadband access leads operators to upgrade the existing access infrastructures (or building new access network). Broadband access networks require higher investments (especially passive infrastructures such as trenches/ducts and base station towers/masts), and before making any decision it is important to analyze all solutions. The selection of the best solution requi...

In heterogeneous radio access networks mobile terminals can dynamically change their radio access not only between access points but also between different radio access technologies (RATs). We present a network based Multi-Radio Management (MRM) for seamless control of inter-RAT mobility. Access Selection can be triggered by a change of radio channel quality, by the start of an application or b...

In multi access network environments, mobile stations may encounter multiple choices for selecting an access network. Carefully designed access selection schemes can provide not only mobile users with better services but also network operators with better resource utilizations. It is also envisioned that further improvements can be achieved by redistributing mobile stations from one access netw...

The digital revolution happened very quickly. Only 20 years ago, fewer than 10 percent of American households had computers. However, by as early as 1993, the number of American households with computers had already risen to almost 25%. At the same time, the Internet was quickly growing in popularity. Tim Berners-Lee debuted the World Wide Web on August 6, 1991, and within five years, most publ...