Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [ IEEE 802.15.4 MAC O

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Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [ IEEE 802.15.4 MAC Overview ] Date Submitted: [ 10 May, 2004 ] Source: [ Marco Naeve ] Company [ Eaton Corporation ] Address [ 4201 North 27 th Street, Milwaukee, WI 53216, USA ]
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Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)Submission Title: [IEEE 802.15.4 MAC Overview] Date Submitted: [10 May, 2004] Source: [Marco Naeve] Company [Eaton Corporation]Address [4201 North 27th Street, Milwaukee, WI 53216, USA]Voice:[414-449-7270], FAX: [414-449-6131], E-Mail:[marconaeve@eaton.com] Re: [Reflector discussions. References: IEEE 802.15.4-2003 standard, 03036r0P802-15_WG-802-15-4-TG4-Tutorial.ppt by Jose Gutierrez, and 03057r0P802-15_TG4-Specification_summary.ppt by Pat Kinney, Paul Gorday, Phil Jamieson]Abstract: [This document presents an overview of the IEEE 802.15.4 MAC sub-layer as currently specified in the 2003 version of the standard.]Purpose: [For informative purpose for the IEEE 802.15.4a task group.]Notice: This document has been prepared to assist the IEEE P802.15. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein.Release: The contributor acknowledges and accepts that this contribution becomes the property of IEEE and may be made publicly available by P802.15. Marco Naeve, Eaton Corp.Content
  • Overview
  • Topologies
  • Superframe structure
  • Frame formatting
  • Data service
  • Management service
  • Interframe spacing
  • CSMA procedure
  • Marco Naeve, Eaton Corp.802.15.4 ArchitectureUpper LayersIEEE 802.2IEEE 802.15.4 SSCSLLC, Type IIEEE 802.15.4 MACIEEE 802.15.4IEEE 802.15.4868/915 MHz2400 MHzPHYPHYMarco Naeve, Eaton Corp.Protocol Drivers
  • Extremely low cost
  • Ease of installation
  • Reliable data transfer
  • Short range operation
  • Reasonable battery life
  • Marco Naeve, Eaton Corp.MAC Overview
  • Star and peer-to-peer topologies
  • Optional frame structure
  • Association
  • CSMA-CA channel access mechanism
  • Packet validation and message rejection
  • Optional guaranteed time slots
  • Guaranteed packet delivery
  • Facilitates low-power operation
  • Security
  • Marco Naeve, Eaton Corp.IEEE 802.15.4 Device Classes
  • Full function device (FFD)
  • Any topology
  • PAN coordinator capable
  • Talks to any other device
  • Implements complete protocol set
  • Reduced function device (RFD)
  • Limited to star topology or end-device in a peer-to-peer network.
  • Cannot become a PAN coordinator
  • Very simple implementation
  • Reduced protocol set
  • Marco Naeve, Eaton Corp.IEEE 802.15.4 Definitions
  • Network Device: An RFD or FFD implementation containing an IEEE 802.15.4 medium access control and physical interface to the wireless medium.
  • Coordinator: An FFD with network device functionality that provides coordination and other services to the network.
  • PAN Coordinator: A coordinator that is the principal controller of the PAN. A network has exactly one PAN coordinator.
  • Marco Naeve, Eaton Corp.Low-Power Operation
  • Duty-cycle control using superframe structure
  • Beacon order and superframe order
  • Coordinator battery life extension
  • Indirect data transmission
  • Devices may sleep for extended period over multiple beacons
  • Allows control of receiver state by higher layers
  • Marco Naeve, Eaton Corp.FFDCommunications flowRFDStar TopologyPANcoordinatorMaster/slaveMarco Naeve, Eaton Corp.FFDCommunications flowRFDPeer-Peer TopologyPANcoordinatorsPoint to pointCluster treeMarco Naeve, Eaton Corp.FFDCommunications flowRFDCombined TopologyClustered stars - for example,cluster nodes exist between roomsof a hotel and each room has a star network for control.Marco Naeve, Eaton Corp.15ms * 2nwhere 0  n  14Network beaconTransmitted by PAN coordinator. Contains network information,frame structure and notification of pending node messages.BeaconextensionperiodSpace reserved for beacon growth due to pending node messagesContentionperiodAccess by any node using CSMA-CAGuaranteedTime SlotReserved for nodes requiring guaranteed bandwidth [n = 0].Optional Frame StructureBattery life extensionGTS 3GTS 2GTS 1Contention Access PeriodContention Free PeriodSlotMarco Naeve, Eaton Corp.15ms * 2SOwhere 0  SO  1415ms * 2BOwhere SO  BO  14Optional Frame Structure
  • Superframe may have inactive period
  • Inactive PeriodSO = Superframe orderBO = Beacon orderMarco Naeve, Eaton Corp.General MAC Frame FormatFrame control fieldMarco Naeve, Eaton Corp.Beacon Frame FormatMarco Naeve, Eaton Corp.MAC Command Frame
  • Command Frame Types
  • Association request
  • Association response
  • Disassociation notification
  • Data request
  • PAN ID conflict notification
  • Orphan Notification
  • Beacon request
  • Coordinator realignment
  • GTS request
  • Marco Naeve, Eaton Corp.Data Frame FormatAcknowledgement Frame FormatMarco Naeve, Eaton Corp.Data Service
  • Data transfer to neighboring devices
  • Acknowledged or unacknowledged
  • Direct or indirect
  • Using GTS service
  • Maximum data length (MSDU) aMaxMACFrameSize(102 bytes)
  • Marco Naeve, Eaton Corp.MAC Data PrimitivesMarco Naeve, Eaton Corp.Data TransferMessage Sequence DiagramMarco Naeve, Eaton Corp.Indirect Data TransferMessage Sequence DiagramMarco Naeve, Eaton Corp.Management Service
  • Access to the PIB
  • Association / disassociation
  • GTS allocation
  • Message pending
  • Node notification
  • Network scanning/start
  • Network synchronization/search
  • Marco Naeve, Eaton Corp.MAC Management PrimitivesMarco Naeve, Eaton Corp.AssociationMessage Sequence DiagramMarco Naeve, Eaton Corp.DisassociationMessage Sequence DiagramMarco Naeve, Eaton Corp.Data PollingMessage Sequence ChartNo data pending at the coordinatorMarco Naeve, Eaton Corp.Data PollingMessage Sequence ChartData pending at the coordinatorMarco Naeve, Eaton Corp.Passive ScanMarco Naeve, Eaton Corp.Active ScanMarco Naeve, Eaton Corp.OrphaningMessage Sequence DiagramMarco Naeve, Eaton Corp.Inter-frame SpacingFor frames ≤ aMaxSIFSFrameSize use short inter-frame spacing (SIFS)For frames > aMaxSIFSFrameSize use long inter-frame spacing (LIFS)Marco Naeve, Eaton Corp.Slotted CSMA ProcedureUsed in beacon enabled networks.Marco Naeve, Eaton Corp.Un-slotted CSMA ProcedureUsed in non-beacon networks.Marco Naeve, Eaton Corp.Thank you!QuestionsMarco Naeve, Eaton Corp.
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