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802.11 - Chapter6: frombookbyW.Stallings...

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cps750 wireless networking 6-1 Chapter 6: Wireless and Mobile Networks and materials  from book by W. Stallings Background:   # wireless (mobile) phone subscribers now exceeds # wired  phone subscribers! computer nets: laptops, palmtops, PDAs, Internet-enabled  phone promise anytime untethered Internet access two important (but different) challenges communication over wireless link handling mobile user who changes point of attachment to network
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cps750 wireless networking 6-2 Characteristics of selected wireless link  standards Indoor 10-30m Outdoor 50-200m Mid-range outdoor 200m – 4 Km Long-range outdoor 5Km – 20 Km .056 .384 1 4 5-11 54 IS-95, CDMA, GSM 2G UMTS/WCDMA, CDMA2000 3G 802.15 802.11b 802.11a,g UMTS/WCDMA-HSPDA, CDMA2000-1xEVDO 3G cellular enhanced 802.16 (WiMAX) 802.11a,g point-to-point 200 802.11n Data rate (Mbps) data
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cps750 wireless networking 6-3 Wireless network taxonomy single hop multiple hops infrastructure (e.g., APs ) no infrastructure host connects to  base station (WiFi, WiMAX, cellular)  which connects to  larger Internet no base station, no connection to larger  Internet (Bluetooth,  ad hoc nets) host may have to relay through several wireless nodes to  connect to larger  Internet: mesh net no base station, no connection to larger  Internet. May have to relay to reach other  a given wireless node MANET, VANET
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cps750 wireless networking 6-4 IEEE 802.11 Wireless LAN 802.11b 2.4-5 GHz unlicensed radio  spectrum up to 11 Mbps direct sequence spread spectrum  (DSSS) in physical layer all hosts use same chipping  code widely deployed, using base  stations 802.11n   multiple antennae 2.4-5 GHz range up to 200 Mbps 802.11a   5-6 GHz range up to 54 Mbps 802.11g   2.4-5 GHz range up to 54 Mbps 802.11e   QoS upgrade of 802.11 802.11p   Vehicular communications All use CSMA/CA for multiple access All have base-station and ad-hoc network  versions
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cps750 wireless networking 6-5 Making the Data Network Go Mobile Cellular Systems GSM, TDMA, CDMA GPRS, EDGE W-CDMA, 3G  Personal Area        Local Area               Wide Area PAN Bluetooth Wireless LAN IEEE.802.11,  HiperLAN/2
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cps750 wireless networking 6-6 Complementing wireless datacom solutions Mbps 1 10 100 0,1 Outdoor Fixed Walk Vehicle Indoor Fixed/ Desktop Walk Mobility Wideband Cellular W-LAN User Bitrate, Datacom services Bluetooth G S M , I S - 9 5 , D - A M P S LAN Wide Area Network (WAN) - Coverage Local Area Network (LAN) - Hot Spots - high speed Personal Area Network (PAN) - Connectivity, cable replacement
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cps750 wireless networking 6-7 Crowd in ISM
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cps750 wireless networking 6-8 802.11 LAN architecture wireless host communicates with base  station base station = access point (AP) Basic Service Set (BSS)  (aka “cell”) in  infrastructure mode contains: wireless hosts
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