Along with the widespread use of the Internet has come a considerable increase in the variety of applications being tried out, one of the most promising of which is packet telephony. Meanwhile, with the spread of the wireless local area network (WLAN) environment, there is growing demand for support for real-time traffic over WLAN. In this paper, we propose a modified MAC protocol that supports...

The performance of handoff initiation algorithm is one of the key issues for providing roaming capability in wireless LAN (WLAN). In this paper, we propose a new handoff initiation algorithm for data transmitting in WLAN. Our proposal combines association time, system load and signal/noise ratio (SNR) together to decide whether mobile node should handoff or not. The goal is to reduce the number...

In this paper, we consider the mitigation of cochannel interference in Bluetooth by means of adaptive frequency hopping (FH). Prior to sending packets, the proposed scheme classifies whether the next FH channel is in use by other signals or not. It also periodically classifies channels occupied by the WLAN signal to change the hopping frequency. For fast classification of busy channels, it divi...

We present a generic business model for (WLAN) hotspots that comprises a role, resource and revenue model of a value network. We focus on the role model and the roaming model, as they are the essential to a wireless hotspot enterprise. In addition, we describe an instantiation of these models to arrive at a viable roaming business case for stakeholders in a hotspot enterprise in the Netherlands...

Recent rapid development of high-speed wireless access technologies has created mixed WLAN (Wireless LAN) environments where QoS capable APs coexist with legacy APs. To provide QoS guarantee in this mixed WLAN environment, this paper proposes a new AP selection algorithm. The proposed algorithm assigns an STA (Station) to an AP in the overall WLAN service area. Simulation results show improveme...

Over the last decade a manifold of WLAN-based localization methods have evolved, whereupon most approaches focus on accurate location estimation and tracking using absolute coordinates. In this paper we propose a system prototype utilizing WLAN infrastructure for relative spatial determinations using discrete, unambiguously distinguishable zones. The prototype allows imitating near field commun...

In this paper, a planar antenna for Long Term Evolution (LTE) bands and Wireless Local Area Network (WLAN) is proposed. The based on coupled-fed monopole with distributed inductor direct-fed monopole. These three components form two of operations namely low operating band from 0.59 to 0.635 GHz high 1.67 2.80 GHz. satisfy the WMTS 610, UMTS 1700, GSM 1800, LTE 1900, 2100, WLAN 2400, 2600 3600 a...

End-user devices such as smart phones and tablets have become very popular as they offer a variety of wireless Internet accesses ranging from the WLAN standards to WWAN technologies such as LTE or even WiMAX. Due to these different wireless access options and new emerging applications—e.g., from the areas of video streaming, social networks, as well as Internet clouds—people are increasingly co...

In this paper, a novel multi-frequency microstrip antenna with complementary ring slot resonator (CRSR) structure that satisfies Bluetooth, worldwide interoperability for microwave access (WiMAX), and wireless local area network (WLAN) applications is proposed. The conventional consists of circular patch at resonance frequency band 2.5 GHz. By loading two CRSR the radiating element, three opera...

Knowing consumers’ shopping paths is an essential part of successful retailing. Good space management requires accurate data about consumer behavior. Traditionally, these data have been collected through, for example, panel interviews, camera tracking, and in-store observation. Their nature is more or less subjective. Modern technology makes it possible to use more objective methods, such as wi...