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

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Mr. Phillip M. Callahan mentioned. He said that sometimes people buy their own devices and just plug them in without reporting them to the OTC. They can cause interference and security problems. He said it may be cheaper to buy an AP in local store, but this would cause security vulnerability in the end. 5.1.4. Conclusion Figure 5-9 FSUWIN Login System FSU campus is a relatively small area, so it is suitable for Wi-Fi. The network structure is also designed very well. It is a successful wireless network model. The next step of FSUWIN is to install a central controller, upgrade the network for roaming and extend coverage for more indoor environments. So far, the OTC does not have any plans to upgrade the system to IEEE 802.11n or IEEE 802.16, said Mr. Phillip M. Callahan. FSUWIN does not have many serious problems. The technical problems can be solved by new technologies and the policy issues are dependent on FSU. Beside these issues, FSUWIN is a stable and convenient wireless public network. In the future, if a small town, a village or other smaller areas want to upgrade its existed wired network to wireless public network, FSU is a good example to follow. 5.2. WiFly in Taipei 5.2.1. Introduction WiFly is part of the Mobile Taiwan Applications Promotion Project. This project started in 2004 and its goal is “to bring out communication industries growth and stronger of national competitiveness based on complete broadband network infrastructure.” [74] WiFly is based on Wi-Fi standard (IEEE 802.11 a/b/g). The WiFly has officially operated for one and a half years 74
since the January 2006. The population coverage is more than 90%, but the geographic coverage is only about 50%. The total number of APs are about 4200. 5.2.2. Implementation The WiFly infrastructure installation was split in three stages. The first stage was to cover the 30 MRT (Mass Rapid Transit) stations and the surrounding areas, including the underground shopping streets. This stage was finished in May 2005. The second stage included 42 main city arteries, shopping districts, coffee shops, and the rest of MRT stations and so on. There were about 2000 APs that were installed in this stage. In the third stage, there were 9 city hospitals, 53 libraries, 12 Taipei administrative buildings and 600 7-11s (chained convenient stores) included. The final stage was finished in July 2006. More than 4200 APs were used, and up to 90% of the population was covered. This was a brand new world record. [72] The WiFly uses Nortel Wireless Mesh Network as its fundamental model. Two components, Wireless Gateway 7250 and Wireless Access Point 7220, were used for this model. In this network, the connection between APs is 802.11a and the connection between AP and end users is 802.11b/g. Since there is no need to wire every AP in the network, the cost of installing wired network from gateway to AP and AP to AP can be eliminated. [72] The Nortel Wireless Mesh Network is a solution of installing the outdoor and indoor Wi-Fi network. It is scalable and secure. An ISP can use it to provide wireless internet service and companies can use it to build inner private networks. The network contains three components; a wireless access point, wireless a gateway and a wireless mesh management platform. Figure 5- 10[75], Figure 5-11[75], Table 5-5[75] There are two models of APs, Wireless AP 7220 and Wireless AP 7215. The WAP 7220 is an outdoor and indoor-type AP and the WAP 7215 is an indoor-type AP. Figure 5-12[75]. The WAP 7220s can be connected together to cooperate for improving system performance. WAP 7215 only works in indoor locations. It can connect to either wired or wireless networks. WAP 7220 and WAP 7215 also can cooperate together to form the wireless mesh network. The wireless gateway has two models as well; Wireless Gateway 7250 and Wireless Gateway 7240. The WG 7250 can support 10/100 Ethernet interface and 120 WAPs. The WG 7240 also has 10/100 Ethernet interface but only supports 10 WAPs. The Wireless Mesh Management System provides a communication interface for Nortel’s wired and wireless network products. [75] 75
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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
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2.5. Conclusion WAP (Wireless Appli
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IEEE 802.11n is the newest standard
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Table 3-3 Cont. 10 2.457 X Y Y Y Y
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3.3.1.2. PLCP and PMD The physical
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Noise Codes). The most powerful con
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Figure 3-5 CCK Modulation HR-DSSS P
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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 and 72: Figure 4-7 Coverage and Capacity fo
Page 73 and 74: CHAPTER FIVE 5. Case study This cha
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: 5.1.3. Analysis The FSU wireless ne
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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