IEEE 802.15.4 Draft StandardIntroductionMotivationHistory of DevelopmentHigh-Level CharacteristicsNetwork Layer GuidelinesTopology FormationsData Link LayerSystem LayeringMAC Frame FormatSuperframe BeaconsAdditional MAC FeaturesPhysical LayerPhysical Layer Packet StructureOther Physical Layer FeaturesTelos PlatformMicaZ PlatformIEEE 802.15.4 Draft StandardPresented by Arsalan TavakoliCS 294 -11October 18, 2005IntroductionHome Networking Application ClassesInternet connectivityMulti-PC ConnectivityAudio/Video NetworkingHome AutomationEnergy ConservationSecurityMotivationPersonal Area Network RequirementsLow Power ConsumptionMinimal Installation CostLow Overall CostExisting TechnologiesWired802.11BluetoothHistory of DevelopmentCombination of Two Standards GroupsZigBee AllianceIEEE 802 Working Group 15Task Group 4 formed in December 2000Low-rate Wireless Personal Area NetworkFocus only on Physical and MAC layer specificationsHigh-Level CharacteristicsNetwork Layer Guidelines802.15.4 Specification does not address Network LayerExpected to be self-organizing and self-maintaining to minimize cost to userTwo Network Topologies Supported:Star TopologiesPeer-to-Peer TopologiesTopology FormationsData Link LayerTwo PartsLogical Link Control (LLC)Standard among many 802.x standardsCommunicates with MAC through SSCSProprietary LLC’s can communicate directlyMAC SublayerData Service - Common Part SublayerManagement Service – Management EntitySystem LayeringMAC Frame FormatSuperframe BeaconsTime between beacons divided in 16 time slotsCan be used to provide bandwidth guaranteesContention-free period and duration of superframe announced in beaconAdditional MAC FeaturesChannel Access MediumsSlotted CSMA-CAUnslotted CSMA-CAAcknowledgementsSecurityNo securityAccess Control ListsSymmetric Key SecurityPhysical LayerTwo Potential Physical Layers868/915Mhz2.4GhzDirect Sequence Spread SpectrumSame Packet Structure27 Frequency Channels TotalDynamic Channel Selection left to network layerPhysical Layer Packet StructureOther Physical Layer FeaturesModulation868/915 – Binary Phase Shift Keying2.4 – Offset Quadrature Phase Shift KeyingSensitivity and Range868/915 -92 dBm2.4 -85 dBm10-20m typical rangeTelos PlatformMicaZ
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