network protocols handbook.pdf

225Protocols GuideMAN ProtocolsProtocol NameIEEE 802.16: Broadband WirelessMAN Standard (WiMAX)Protocol DescriptionThe IEEE 802.16 defines wireless service that provides a communicationspath between a subscriber site and a core networksuch as the public telephone network and the Internet. TheWireless MAN technology is also branded as WiMAX, This wirelessbroadband access standard provides the missing link forthe “last mile” connection in metropolitan area networks whereDSL, Cable and other broadband access methods are not availableor too expensive.IEEE 802.16 standards are concerned with the air interfacebetween a subscriber’s transceiver station and a base transceiverstation. IEEE 802.16 is approved by th IEEE in June2004. Three working groups have been chartered to producestandards: Task Group 1 of IEEE 802.16 developed a point-tomultipointbroadband wireless access standard for systems inthe frequency range 10-66 GHz. The standard covers both theMedia Access Control (MAC) and the physical (PHY) layers.Task groups a and b are jointly producing an amendment to extendthe specification to cover both the licensed and unlicensedbands in the 2-11 GHz range.IEEE 802.16 and WiMAX are designed as a complimentarytechnology to Wi-Fi and Bluetooth. The following table providesa quick comparison of 802.16a with to 802.11b:Parameters8 0 2 . 1 6 a(WiMAX)8 0 2 . 1 1(WLAN)802.15 (Bluetooth)F r e q u e n c y 2-11GHz 2.4GHz VariesBand:Range ~31 miles ~100 meters ~10metersData transferrate:Number of users:70 Mbps 11 Mbps – 55Mbps20Kbps – 55MbpsThousands Dozens DozensEnd-to-End DelayTransit DelayMAC DelayProtocol StructureIEEE 802.16 Protocol Architecture has 4 layers: Convergence,MAC, Trnamission and physical, which can be map to two OSIlowest layers: phusical and data link.Digital Audio/Video MulticastDigital TelephonyVirtual Point - to - PointFrame RelayFigure 2-17: IEEE 802.16 (WiMax) Protocol StackRelated protocolsIEEE 802.11, WLAN, Bluetooth, IEEE 802.15Sponsor SourceWireless MAN is defined by the IEEE 802.16 working group.ReferenceOSI Data Link LayerOSI Physical LayerConvergenceMACTransmissionPhysicalIPATMBack HaulBridge Lanhttp://grouper.ieee.org/groups/802/16/published.htmlPublished 802.16 standardshttp://www.intel.com/ebusiness/pdf/wireless/intel/80216_wimax.pdfIEEE 802.16 and WiMAXSubscriberTerminalSubscribernetworkSNI STS Air Interface BTS BNICoreNetworkProvidedServiceSNI: STS Network InterfaceSTS: Subscriber Tranceiver StationRepeater (Optional)Figure 2-16: IEEE 802.16 (WiMax) Functional Flow ChartBTS: Base Tranceiver StationBNI: BTS Network Interface