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...

The upcoming discussion about integrating the Wireless LAN standard into future mobile networks of the 4th Generation (4G) does not only strengthen the importance of the IEEE 802.11 standard family, but necessitates the support of Quality-of-Service (QoS) even when the user moves between different Access Points. In this paper, we study different Wireless LAN handover mechanisms and their abilit...

Wireless LAN technology is complementary to 3G systems and could be used to provide high bandwidth hot spot coverage, for example in railway stations and offices, in order to provide the high bandwidth video and broadband services such as those emerging on DSL fixed access. The IST Projects BRAIN and MIND have investigated a number of key technical enablers for such a “system beyond 3G”. These ...

The IEEE 802.11 wireless LAN (WLAN) is the most widely used standard nowadays for wireless LAN technology. However, the current standard does not provide QoS support required by the wide range of end applications (e.g., multimedia communications). Thus, a large number of enhancements to the standard are being proposed. This paper summarizes some of the most relevant schemes and presents a surve...

An ad hoc network is a collection of wireless mobile nodes dynamically forming a temporary network without the use of any existing network infrastructure or centralized administration. The architecture of the IEEE 802.11 WLAN is designed to support a network where most decision making is distributed to the mobile striation. The first, IEEE Standard 802.11a, is an orthogonal frequency domain mul...

Over the last few years, many positioning systems using wireless LAN have been developed. Some systems use signal strength for positioning. But the distribution of received signal strength depends on orientation of mobile terminal. In this paper, we examine the differences of received signal strength distribution to each orientation and propose an orientation estimation method using the diverge...