The recent widespread deployment of wireless LAN technology raises the question of how a mobile telephony system might instead be architected to use wireless LAN access points and the Internet to achieve similar services. In this paper, we examine an end-to-end architecture for mobile telephony, with a strong focus on endpoint issues. We have designed, implemented, and have experience using dev...

Convergence of wireless communications, computing and Internet is on the way. This will be the driving force towards a wireless multimedia society. In this paper, we will overview today’s standards of 3G cellular and wireless LAN systems. There are two trends complementing each other: enhancing the cellular technology (3G WCDMA, cdma2000, etc) and enhancing the wireless LAN technology (HiperLAN...

A wireless LAN (local area network) was proposed as a means of determining location at a construction site. The high prevalence of equipment and facilities was offered as an advantage compared to existing methods. An experiment was performed to collect RSSI (radio signal strength indications). From the results, variations were shown in RSSI from radio signal transmission conditions, and the app...

Beginning with the adoption of the de-facto standard for wireless LAN communications IEEE 802.11 in 1999 we can observe a continuous growth of public wireless LAN hotspots that provide access to the Internet for modern road warriors. Unfortunately, current hotspots still suffer from several security drawbacks. In this paper we analyse how payment schemes used in current hotspot architectures co...

*Correspondence to: Gilbert Held, 4-Degree Consulting, 4736 Oxford Road, Macon, GA 31210, USA. E-mail: [email protected] Over the past few years the use of wireless LANs has evolved from a curiosity to a necessity. When we travel to many Starbucks or McDonalds, visit an airport or check into a hotel or motel the chances are high that we are able to access the Internet via a wireless LAN connec...

Data mining methods have gained importance in addressing computer network security. Existing Rule based classification models for anomaly detection are ineffective in dealing with dynamic changes in intrusion patterns and characteristic. Unsupervised learning methods have been given a closer look for network anomaly detection. We investigate hierarchical clustering algorithm for anomaly detecti...

An overview is given of the new IEEE 802.11n standard. This is the first wireless LAN standard based on MIMO-OFDM, a technique pioneered by Airgo Networks to give a significant performance increase in both range and rate relative to conventional wireless LAN. Performance results show that net user throughputs over 100 Mbps are achievable, which is about four times larger than the maximum achiev...

The IEEE network technology is the emerging standard for wireless LANs and mobile networking The fundamental access mechanism in the IEEE MAC protocol is the Distributed Coordination Function In this paper we present an analytical method of estimating the saturation throughput of wireless LAN in the assumption of ideal channel conditions The proposed method generalizes the existing LAN models a...

We address the problem of locating users inside buildings using a radio-frequency (RF) wireless LAN. A previous paper presented the basic design and a limited evaluation of a user-location system we have developed. In this paper, we analyze shortcomings of the basic system, and develop and evaluate solutions to address these shortcomings. Additionally, we describe several new enhancements, incl...

We have developed and implemented novel solutions that provide Quality of Service (QoS) support for voice, video and data applications in wired and wireless LANs that can also follow standards such as Ethernet IEEE 802.3 or wireless IEEE 802.11. Since our solutions can transform existing legacy LANs to an environment that provides the bandwidth, time-delay and other requirements needed to provi...