A comparison of wi-fi and wimax with case studies - Florida State ...

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an urban area, there are still several problems remaining to be solved for wireless communication. That is the task of WiMax. [58] In smaller cities and suburban areas, wireless communication has better performance. This is because the competition between wireless and wired is less and the topography is more favorable. It is not worth installing fiber or DSL in this kind of area. Population distribution of these areas is usually scattered, so it will cost more to wire the whole network in this situation. And the numbers of users may be a problem too, thus wireless could be a better choice. Especially when lower-frequency microwave with (NLOS) is more suitable. [58] Wireless communication has the best performance in rural areas. Not only because of the lack of competition, but also the more friendly geography. It however still has challenges. How to and where to set up stations are two major problems. Distance and population distribution must be considered as well. [58] When moving in a vehicle, mobile-WiMax can support wireless access. Unlike 3G, mobile- WiMax can provide not only mobility but also BWA. For example, when taking a train for long distance trip, people can use mobile-WiMax to access the Internet for news, video entertainment, or online-game to entertain themselves. However, since the mobile-WiMax is still not commercialized, besides in Korea, the practical operation will continue to be on hold.. 60
CHAPTER FIVE 5. Case study This chapter will discuss and compare three individual cases using Wi-Fi or WiMax to build up the public wireless network. These cases are located in the cities of Tallahassee, Fl, USA, Taipei, Taiwan and Seoul, South Korea. The network located at Florida State University in Tallahassee, Fl, USA uses 802.11b/g to build an indoor and partial outdoor wireless network. That allows students and faculties to use wireless access in any building. Taipei initiated their public wireless network project in September 2004. This project is contracted by Q-ware communications, Inc. The operation was officially started in December 2005. The service area covers 90% of the population of Taipei City. Installation was officially finished in September 2006 and was named WiFly. South Korea is the first country operating the commercial WiMax network. It is not the only country that uses the fixed-WiMax technology. They are the only country that also combines it with mobile-WiMax. This project is developed by the Korean telecoms industry. The main coverage area is located in its capital, Seoul. The network was launched in June 2006. Florida State University located in Tallahassee, Florida is the easiest one to gather data, because it is nearby. And by interviewing the related staff [147], more precise and detailed information could be collected. Because the information and business news concerning WiFly are written in English and Chinese, they are easy to read and collect. However because of the time factor, only one interview was conducted concerning WiFly. Most of the data was gathered from the Internet and books. Although it is easy to find the newest information on the Internet, it require cross validation to ensure its validity. This is the most important issue when doing a case study of Wifly. WiBro is the most difficult one of data collection and analysis in case studies. it is because of language barrier. The WiBro official website has an English version, but not for all documents. Most of them are written in Korean. Thus the information is limited and makes the analysis more difficult. The following sections will introduce these three cases and their implementation. Each section contains analysis and small conclusion. The last section is the overall analysis. 5.1. FSU wireless network 5.1.1. Introduction The wireless network solution of FSU (Florida State University) is called FSUWIN. WIN means Wireless Integrated Network. This network is based on the existed wired network and provides a more flexible and convenient internet service on campus. With FSUWIN, students 61
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THE FLORIDA STATE UNIVERSITY COLLEG
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TABLE OF CONTENTS List of Tables…
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5. Case study…………………
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LIST OF FIGURES Figure 2-1 The Evol
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LIST OF ABBREVIATIONS Abbreviation
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PSS Portable Subscriber Station 89
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CHAPTER ONE 1. Introduction The cel
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Table 1-1 Cont. 802.3an 2006 10GBAS
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2.1. Introduction CHAPTER TWO 2. 3G
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2.3. Development 3G has been in dev
Page 21 and 22: 2.5. Conclusion WAP (Wireless Appli
Page 23 and 24: IEEE 802.11n is the newest standard
Page 25 and 26: Table 3-3 Cont. 10 2.457 X Y Y Y Y
Page 27 and 28: 3.3.1.2. PLCP and PMD The physical
Page 29 and 30: Noise Codes). The most powerful con
Page 31 and 32: Figure 3-5 CCK Modulation HR-DSSS P
Page 33 and 34: other problem is inter-carrier inte
Page 35 and 36: Tab ble 3-5 OFDDM Modulaation and D
Page 37 and 38: and contains DSSS, CCK, PBCC (Packe
Page 39 and 40: 3.3.2. MAC Layer 3.3.2.1. Introduct
Page 41 and 42: Virtual channel sensing he other me
Page 43 and 44: SIFS (Short InterFrame Spacing) Fig
Page 45 and 46: Figure 3-20 WEP Frame and Operation
Page 47 and 48: 3.4.2. MIMO (Multiple-Input/Multipl
Page 49 and 50: 4.1. The background of IEEE 802.16
Page 51 and 52: The working groups of WiMax Forum a
Page 53 and 54: Table 4-1 Thee Basic Datta of IEEE
Page 55 and 56: Figure 4-1 The Layer Structure of I
Page 57 and 58: codes ( (CTC) and low densityy pari
Page 59 and 60: 4.3.1.2.2. AAS (Advanced Antenna Sy
Page 61 and 62: Best-effort service (BE) This schem
Page 63 and 64: Encryption Figure 4-4 PKM Protocol
Page 65 and 66: 4.3.2. IEEE 802.16e-2005, the newes
Page 67 and 68: transmiission, the aadjacent cellls
Page 69 and 70: the uplink bandwidth periodically f
Page 71: Figure 4-7 Coverage and Capacity fo
Page 75 and 76: increased bandwidth, fixed connecti
Page 77 and 78: Figure 5-3 Landis Green Figure 5-4
Page 79 and 80: Table 5-2 Xirrus XS-3700 AP Technol
Page 81 and 82: • Automatic Tx power selection
Page 83 and 84: Table 5-4 Cont. 71
Page 85 and 86: 5.1.3. Analysis The FSU wireless ne
Page 87 and 88: since the January 2006. The populat
Page 89 and 90: Table 5-5 Parameters of WLAN and Me
Page 91 and 92: Table 5-6 Features of Nortel Wirele
Page 93 and 94: • -101 dBm typical @ 1 Mbps Recei
Page 95 and 96: Operating environment specification
Page 97 and 98: uilding density, high population de
Page 99 and 100: epeater r is developping and it wil
Page 101 and 102: Figure 5-17 WiBro Features The data
Page 103 and 104: Figure 5-19 U-RAS Premium Figure 5-
Page 105 and 106: In KT’s recent report, 60% of sub
Page 107 and 108: Figure 5-21 An Example Application
Page 109 and 110: Name Parameters Standard Table 5-10
Page 111 and 112: WiFly used Wi-Fi to cover 60% of th
Page 113 and 114: BIBLIOGRAPHY [01]. IEEE 802.11 offi
Page 115 and 116: [37]. Sun, Y.; "Bandwidth-efficient
Page 117 and 118: [88]. Mineno T.; Babji T.,"Issues a
Page 119 and 120: [117]. Yun Z.; Yuguang F., "Securit
Page 121 and 122: Network Operations and Management S
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