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

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Terms Table 5-8 The Comparison of WiBro and WiMax. Standards Operation Band Bandwidth WiMax (IEEE 802.16-2005) 2 – 11 GHz for fixed 10 – 66 GHz for mobile 1.75 MHz, 3.5 MHz, 7 MHz, 14 MHz, 1.25 MHz, 5 MHz, 10 MHz, 15 MHz, 8.75 MHz 92 WiBro 2.3 – 2.4 GHz 10 MHz Multiplexing Burst TDM/TDMA/OFDMA OFDMA Duplexing TDD and FDD TDD Modulation QPSK, 16-QAM, 64-QAM QPSK, 16-QAM, 64- QAM Channel Coding CC, CTC, RS, LDPC CTC Data Rate 1 – 75 Mbps QoS mode 5.3.4. Analysis UGS, rtPS, nrtPS, BS; ARQ/H-ARQ UL: 6.1 Mbps DL: 18.4 Mbps rtPS, nrtPS, BS; ARQ/H-ARQ Power Saving Sleep Mode, Idle Mode Sleep Mode Coverage Maximum 10 km Urban 1 km Mobility 120 km/hr 60 km/hr Other Techs AAS, AMC, MIMO AAS, AMC, MIMO WiBro has been in use for one year. However the number of users is not as high as predicted. At the end of June 2007, there were twenty thousand registered users and the goal is two hundred thousand by the end of 2007. If WiBro wants to reach this goal, it has to increase by 170,000 users in half year! According to a recent study from IDC Korea, the subscribers will reach 130,000 at the end of 2007, 600,000 in 2008, 1.4 million in 2009 and 3.9 million in 2011. If there are various supplemental applications and devices available in the market, the number will grow to 800,000 in 2008 and 5 million in 2011. This prediction may be too optimistic compared to the current situation. [84][85]
In KT’s recent report, 60% of subscribers are between 30 and 40 and 20% are college students in their 20s. They also find that these customers are satisfied with service and price but upset about the prices and availability of devices. KT has to pay subsidization to laptops, WiBrophone and USB-modem buyers about one hundred to two hundred and sixty dollars. However, after subsidizing, the NB (model # NT-Q35) still costs $1750 to $2400, not including accessories. Until June 2007, the WiBro-related products include two pc-cards, two cell-phones, two mobile- PCs and one notebook. The choices are very limited. [76] – [78][84][85] The coverage of WiBro so far is still restricted in Seoul and certain nearby areas. The speed is fast but the signal is not stable. Although the mobility is available in a bus or subway, the operation environment is not friendly to use a mobile-PC or NB, not to mention the connection is not stable. People need a seat to operate them. Since 3G also can provide mobile internet service and is more reliable, WiBro really faces a very difficult situation in South Korea. Mobility is the most important feature of WiBro. If subscribers cannot feel the advantages, it would be difficult to increase numbers. Therefore in technical field, WiBro has to not only improve signal quality and coverage, but also the mobility. The device problem, sooner or later, will be solved. It is just a matter of time. When mechanism becomes mature, the price will goes down and products will be more varied. In marketing field, KT WiBro proposed six applications: Wonder-Eye (Personal Multimedia service, Push-Pull on Demand), Wonder-Media (Video Streaming), Wonder-Media (MMS), Wonder-Phone (Video-Phone), Wonder-Net (Wireless Internet Service), Wonder-Tour (3-D tour of APEC). These applications contain multimedia and internet service. WiBro is an interface between users and network. And it can be found out that these applications are overlapped with 3G and Wi-Fi. Thus WiBro has to provide better system performance; otherwise it is difficult to take marketing share from other two standards. After all, they are not kill applications. For WiBro’s long term development, KT and SKT should put more effort on technical problems. 5.3.5. Conclusion KT, SKT and Samsung still believe in the future of WiBro. With the extension of coverage and new available devices, the subscribers are going to increase. But prices and service contents are the real problems waiting to be solved. If WiBro is not the essential requirement and there are alternative choices available and better for internet access, WiBro is difficult to increase the market share. Therefore considering the occasions which WiBro is used, mobility and stable signal are the only way for it to keep going. 93
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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
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4.1. The background of IEEE 802.16
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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 and 100: epeater r is developping and it wil
Page 101 and 102: Figure 5-17 WiBro Features The data
Page 103: Figure 5-19 U-RAS Premium Figure 5-
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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