Allocation For Wi-Fi Devices At Campus of Udayana University in Bukit Jimbaran Using Atoll Applications

Access to intranet and internet networks in the campus area requires a number of Wi-Fi devices to cover the coverage area of Udayana University. The Wi-Fi service is expected to be used for VoIP applications in the context of wireless communications. The IEEE 802.11g standard specifies an outdoor service range of 140 m and an indoor service range of 38 m. From research conducted in the engineering faculty area, the quality of VoIP service uses Wi-Fi with range of 25 m. In this research, the design of Udayana University campus Wi-Fi needs using Atoll application with IEEE802.11g standard at 140 m, 38m and 25m ranges. The results obtained to cover Udayana University campus area require Wi-Fis: 7 units for range 140 m, 98 units for range of 38 m and 225 units for range of 25 m


I. INTRODUCTION 1
Udayana University has a very wide area where the faculties are distributed in different location.Since a faculty location to another is seperated in a distance, digital information services can be obtained efficiently via intranet or internet network.Therefore, it is required Wifi services that are able to cover all location in the campus area.In addition to the coverage, Wifi services are expected to have a quality service that is able to pass VOIP information, and hence the network at Udayana University can be developed into a wireless internal VoIP network.This is in accordance with Sudiarta research results, Utilization of hotspot network for Telephone Communication using Smartphone and Free Software as campus internal communication [1], since the use of a wireless internal VoIP network can save phone expenses on campus.
IEEE802.11g is a Wi-Fi standard that can reach a distance of 140 m for outdoor conditions and 38 m for indoor conditions [2].In this study have been tested two units of Wi-Fi devices with IEEE802.11g standard in the area of Engineering Faculty with quality that can be used in VOIP service.From the research conducted, it was obtained average distance range of 25 m.Although it is done outdoors but the range is relatively close to indoor conditions due to some reasons including quality expected to skip VoIP service, placement of Wi-Fi close to the building wall using omnidirectional antenna and conditions of measurements around the building where there are many barriers between them.
This research focus is to design Wi-Fi device needs for Udayana University Campus using Atoll application [3], IEEE802.11g standard Wi-Fi devices on the range of 140m, 38 m and 25 m.Wi-Fi devices are assumed to be at heights of 5 m with standard model propagation.The antenna used is omnidirectional 2.5 dBi.

Electrical and Computer Engineering Engineering Faculty, Udayana University
Bali, Indonesia sudiarta@unud.ac.idElectrical and Computer Engineering Engineering Faculty, Udayana University Bali, Indonesia n_pramaita@yahoo.comSudiarta Pande Ketut 1 , Pramaita Nyoman 2 II.METHOD Investigation method for Wi-fi devices allocation at Kampus Bukit Jimbaran Udayana University is shown in the flowchart below, and the tools used for the investigation are GPS, 2 units of Wi-fis supporting standard IEEE802.11g,Atoll application, VoIp server and mobile phone for VoIp testing .
The IEEE802.11 has released multiple sets of standards for various operating frequencies, and ranges of specifications.The first release was IEEE802.11 as an original standard defined in 1997 and clarified in 1999.[4] Some of these old standards are now obsolete, and some are still active.One would be interested in investigating in details the available standards to determine a suitable standard for the intended application of the WLAN network.The average service coverage of IEEE802.11g for VoIP conditions is still well received in the area of Faculty of Engineering at Udayana University, that is in the range of 25 meters for outdoor conditions.This is due to several factors namely: 1. Placement Access Points are almost attached to the wall of the building, and type of antennas used is omnidirectional so that the reflection will give effect closed to the indoor approach conditions. 2 The number of building blocks and trees are overwhelming, and 3. Measurements on VoIP quality are still feasible.

B. Atoll Installation
Installation of Atoll applications was performed on laptops with specifications of Intel Core I7, 1.5 GHz CPU, 4 GB Memories, and 10-version of 32 bits-Windows operating system.
Figure 2 shows the Atoll Application using WGS84 50S Coordinate with clutter, altitude and vector of Bali map.

C. The Coverage of Campus of Unud Bukit
From the measurement of campus area of Udayana University (Unud) using GPS, then using the Google Earth application, the coverage of Campus of Unud can be delineated as shown in Figure 3. Campus locations such as valleys that no buildings are not included in the planning of Wi-Fi campus area.

D. Design using Atoll at 140 m, 38 m and 25 m ranges
In accordance with the IEEE802.11goutdoor standard, the design needs of Wi-Fi devices in the area of Unud Campus was set in the range of 140 m.The design result is shown in Figure 4, where the number of access points required is 7 units with the downlink signal distribution shown on the color coverage, the smaller the signal level obtained by the outer circle.IV.DISSCUSION IEE802.11ggives 2 standards that are for indoor service (38 m) and outdoor (140 m).However, in this study the authors add another distance of 25 m in order to the Wi-Fi design results can be used for VoIP service with good quality.The result of 25 m range is caused by the Wi-Fi laying closed to wall with omnidirectional antenna and reflection from adjacent buildings so that it is closed to indoor condition.But this study results still consider any distribution of people evenly.So that later on the highway, the number of Wi-Fis can be reduced.

V. CONCLUSIONS
Based on the research conducted, the needs for the Wi-Fi devices to cover the area of Unud Bukit Jimbaran campus are as follows: 1.In accordance with the IEEE 802.11g outdoor standard with a distance of 140 m, it is required 7 units of Wi-Fi devices.2. It is required 98 units of Wi-Fi devices according to the IEEE 802.11g indoor standard with a distance of 38. 3.According to IEEE 802.11g standard with VoIP quality with 25 m distance, it is required 225 units of Wi-Fi devices.
From the research conducted, the following suggestions are as follows: 1.It is required further research to analyze Wi-Fi requirement, only in area of buildings in campus area Unud. 2. Further research is required in terms of relating traffic and Wi-Fi needs.
Start Study of literature Recording with GPS boundaries of Unud Bukit Campus Install ATOLL app on laptop Standard 802.11 g distance 140m, 38m, 25m Recording the number of Wifi needed Conclutionn Design needs Wifi device using Atoll application on campus of Unud, The measurement of the IEEE 802.11g range with the wifi device takes several locations in the engineering faculty .IEEE 802.11gThe standard 802.11g was ratified in 2003 as an IEEE standard for Wi-Fi wireless networking and it supports maximum network bandwidth of 54 Mbps compared to 11 Mbps for 802.11b.This standard operates at 2.4 GHz frequency and bandwidth of 20MHz.This standard uses the OFDM or DSSS modulation schemes.This standard employs the SISO antenna technologies, and its indoor / outdoor ranges are from 38 m to 140 m respectively.III.RESULT A. Scenario for measuring IEEE 802.11g coverage with VoIP quality Test conducted by research scenario is presented in figure 1.

Figure 3 .
Figure 3.The Coverage of Campus of Unud Bukit

Figure 4 .
Figure 4.The number of Wi-Fi devices IEEE802.11g in the range of 140 m

Table 1 .
The Wi-Fi requirement per standard used