This is the largest WLAN study to date, and the first to look at a mature WLAN. We employ several measurement techniques, including syslog messages, telephone records, SNMP polling and tcpdump packet captures. This paper analyzes an extensive network trace from a mature 802.11 WLAN, including more than 550 access points and 7000 users over seventeen weeks. As “Wi-Fi” technology becomes ubiquitous, it is increasingly important to understand trends in the usage of these networks. Wireless Local Area Networks (WLANs) are now commonplace on many academic and corporate campuses. In this paper, we describe the theoretical background of LBS and positioning services in location-aware GIS and database technology, the University of Twente Wireless Campus, and the prototype we developed for providing positioning and location-based services using that Wireless Campus environment. The system delivers mapping information for LBS and mobile applications through the use of adaptive, cartography-aware database objects. The research has focused on Wireless LAN positioning techniques and contextually aware data management systems for ubiquitous computing. Initiated in early 2005, the project's research team is comprised of members from the University of Twente Computer Architecture Design and Test for Embedded Systems group, the UT department of Information Technology, Library and Education, and the International Institute for Geo–Information Science and Earth Observation. The Wireless Campus LBS project is designed to provide a test bed for location-based services (LBS) research, and it is a valued service for the University of Twente (UT) campus community. With the Adaptive Data Rate mechanism, it means increasing the number of access points, the signal attenuation (-dB) occurs from the obstacles (Walls) that are penetrated by the Radio Frequency device and causes attenuation (-dB), the more Access points on the Multi-Wall, will allow communication and data transmitting stability. This research also uses the Adaptive Data Rate (ADR) mechanism approach to reduce the amount of packet loss (kbps) resulting from obstacles that cause attenuation (-dB). These recommendations were based on the RSSI for good and excellent level signal (-50 dBm until-10dBm). We used Institut Asia Malang environments as the case study and gave some recommendations for AP placement: ten optimal placements for the first, third and fourth floor, also seven optimal placements for the second floor. The Cost-231 MWM plays a role in estimating the measured power received by user (usually called as Received Signal Strength Indicator/RSSI) by considering the existence of obstacles around the transmitter (AP). This approach used as a reference for access point (AP) placement for campus building. Of research results also gained some room located near some of the access point are having Signal to Interference Ratio-(SIR).Ī new approach has been developed to provide an overview about signal behavior in indoor environments using Cost-231 Multiwall Model (Cost-231 MWM) and Adaptive Data Rate (ADR) method. Experimental results indicate the quality of the reception on location observed is not the same, some point receive very strong signals from more than one access point, while some other point still entered into the realm of blankspot. The analysis performed includes: Signal level, Signal-to- Interference ratio, and Quantity of Access point. The research method used was the experiment through the drive test using Nestpot software. This research aims to map the territory of blankspot on that location, so that it can be used as a reference for optimizing the placement of access points. On the research of the simulation is done against the signal strength of the access point toward the receiver Wi-Fi in the room and the room of the student learning lecturer electrical engineering building FPTK UPI 3 and 4 floors. Installation of the access point is often not structured properly so that the area of scoped in the area of coverage is uneven. The requirement to always be connected to the internet network is seen with the growing number of access points that are installed to meet these needs. Currently the ease of accessing the internet has become a fundamental requirements primarily a college surroundings.
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