Wireless LANs hold the promise of increasing employee productivity by providing them ubiquitous connectivity and mobility across enterprise. It is now a trend to develop the WLAN in various colleges and office campuses for increasing productivity and quality of goods. There are many obstacles when deploying WLAN, which demands seamless indoor handover. The objective of the work reported here is...

We propose a MAC protocol for cognitive radioenabled secondary networks, which opportunistically use the channels of CSMA/CA-based primary network. We have considered IEEE 802.11 WLAN as a de facto primary network in ISM band. Our study focuses on a single WLAN channel that is used by a WLAN client and server for HTTP-based web browsing application. We use the theory of alternating renewal proc...

The physical locations of clients and access points in a wireless LAN may have a large impact on network performance. However, today’s WLAN management tools do not provide information about the location of clients apart from which access point they associate with. In this paper, we describe a scalable and easy-to-deploy WLAN management system that includes a self-configuring location estimation...

In recent years, the concept of nomadic computing has received considerable attention from the business community. As an early form of nomadic information environment (NIE), wireless local area network (WLAN) has gained tremendous popularity with organizations. Using mostly anecdotal evidences, WLAN equipment manufacturers and practitioners claimed that WLAN brought dramatic improvements in the...

We propose a hybrid coupling scheme to connect UMTS and WLAN networks. Under the tightcoupled system, users of WLAN can also use the services of UMTS with guaranteed QoS and seamless mobility, but it is a problem that the capacity of UMTS core network nodes is not enough to accommodate the bulky data traffic from WLAN, since the core network nodes are designed to handle circuit voice calls or s...

This paper describes a design of 1×4 series fed Microstrip Patch Antenna Array for multi-resonance applications such as GPS devices, WCDMA (1910–2190 MHz) and WLAN. This antenna array consists of patch elements using a single layer RT/Duroid 5880 substrate with transformer coupled impedance matching network, which provides high gain of 9.583dB and efficiency 96.08%. This antenna array has good ...

In this paper, the rapid mobility of MIP/WLAN is emulated on a test-bed. The performance of MIP/WLAN at different moving speeds is evaluated. The result shows that current MIP protocol is not suitable for rapid moving environments. This paper depicts the relationship between the performance and the moving speed and breaks down the handoff latency of MIP/WLAN. A Speed Adaptive MIP extension is p...

Wires Equivalent Privacy (WEP) is used to improve the security of wireless LAN (WLAN). By analyzing the weaknesses of WEP and RC4, we design a simulative platform including software and hardware to crack WEP keys. The results show that the WLAN based on WEP is insecure. At last we give some improvements to enhance the WLAN security.

The application of WLAN (Wireless Local Area Network) technology in the healthcare industry has gained increasing attention in recent years. It provides effective and efficient sharing of health information among healthcare professionals in timely treatment of patients (Collaborative Health Informatics Centre, 2000; Whetton, 2005a). However, there is still a concern among healthcare professiona...