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

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2004. It was a very big delay since WiMax was well developing at that time. November 2004 was the critical timing for WiBro. Intel started to get involved in WiBro’s development. It cooperated with LG and KT to help develop WiBro’s equipments and ensure that WiBro can be compatible with WiMax. In April 2005, Samsung was elected as a member of WiMax Forum board, so the integration of WiMax and WiBro was speeded up. Therefore, WiBro became a worldwide standard, little by little. U.S. and Japan both had plans to use WiBro to build their WiMax network. In January 2005, three companies got the operation license, KT, HTI (Hanaro Telecom, Inc.), and SKT. And KT and SKT were selected to run the WiBro business. The system installation was initiated in early 2006. The project has three stages. First stage is to finish installation in 20 major cities at the end of 2006. Second is to finish 18 medium scale cities installation in 2007. And finally finish the 46 remote areas’ installation in 2008. [76] – [78][84][85] 5.3.3. Implementation The operation band of WiBro is between 2.3 GHz to 2.4 GHz. This band is divided into 9 channels. These channels are not overlapped but adjacent and every 3 channels have one guard band, figure 5-16[79] – [82]. WiBro PHY-layer is based on OFDMA for against multipath fading and interference. WiMax supports both TDD and FDD scheme, but WiBro only supports TDD. This is for having biggest spectrum usage. In modulation field, WiBro supports QPSK, 16QAM and 64QAM. And for coding, WiBro uses CTC and other optional method, such as BTC, RS-CC and FEC. Figure 5-17[79] – [82] shows the goal and features of WiBro. Figure 5-16 The Operation Band 88
Figure 5-17 WiBro Features The data rate of Wibro is asymmetric, for a RAS (Radio Access Station) the maximum downlink speed is 18 Mbps and uplink speed is 6 Mbps; for a PSS (Portable Subscriber Station) the maximum downlink speed is 3 Mbps and uplink speed is 1 Mbps. Under mobile conditions, WiBro can only support under 60 kmph movement. It is lower than 3G which is support at least 120 kmph, but much better than Wi-Fi. The coverage of a RAS is defined in three levels, Pico, Micro and Macro. Pico can cover a radius of100 meters area. Coverage of Micro is 400 meters and Macro is 100 meters. This design would make installation of RAS more flexible. [79] – [82] WiBro also has QoS. It contains three schemes, rtPS, nrtPS and BS; not including UGS. For saving power, WiBro provides sleep mode for end users to extend the battery life. In order to improve the system performance, WiBro introduces scheduling algorithm for transmission service and AMC for coding and modulation. WiBro also supports ARQ/H-ARQ (Hybrid Automatic Request) as well as WiMax. This scheme can effectively re-send the packet, if it is damaged by interference or channel fading. The handoff break time between two RASs is less than 150 ms, it is a very good performance comparing with other wireless algorithm, such as PHS. [79] – [82] There are still other optional technologies used in WiBro, for example MIMO, AAS and SDCA(Space Time Coding Adoption). The purpose is to extend the coverage and against interference. Table 5-8[79] – [82] contains the PHY specification of WiBro. Figure 5-18[79] – [82] shows the MAC-layer structure. 89
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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
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Tab ble 3-5 OFDDM Modulaation and D
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and contains DSSS, CCK, PBCC (Packe
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3.3.2. MAC Layer 3.3.2.1. Introduct
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Virtual channel sensing he other me
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SIFS (Short InterFrame Spacing) Fig
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Figure 3-20 WEP Frame and Operation
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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 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: epeater r is developping and it wil
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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