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Factory Automation Draft Text Introduction

This document provides an introduction to the draft text for the factory automation proposal, including requirements, main ideas, and proposed network topology.

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Factory Automation Draft Text Introduction

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  1. Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [ Factory Automation Draft Text Introduction ] Date Submitted: [ 13 May 2009 ] Source: [ Michael Bahr ] Company [ Siemens AG ] Address [ Otto-Hahn-Ring 6, 80200 Munich, Germany ] Voice:[ +49-89-636-49926], FAX: [ ], E-Mail: [ bahr et siemens dod com ] Re: [ Request for draft text for proposal for factory automation] Abstract: [ The document contains an introduction to the draft text provided for the factory automation proposal. ] Purpose: [] 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. Michael Bahr, Siemens AG

  2. Factory AutomationDraft Text Introduction Michael Bahr (Siemens AG) Michael Bahr, Siemens AG

  3. Factory Automation Subgroup • Michael Bahr (Siemens AG) • Rudy Belliardi (Schneider Electric) • Paul Dixon (HiSilicon Technologies Co., LTD.) • Jose Gutierrez (Emerson ) • Ryoji Ono (Mitsubishi Electric) • Zafer Sahinoglu (Mitsubishi Electric Research Labs) • Rene Struik (Certicom) • Ludwig Winkel (Siemens AG) Michael Bahr, Siemens AG

  4. Requirements usage in factory automation possible high determinism / low latency: transmission of sensor data in  10 ms for 15 devices roaming coexistence with IEEE 802.11 scalability in number of sensors sensors per gateway might be more than 100 sensors per gateway trade-off with latency Assumptions assume controlled envi-ronment (factory floor) configuration for optimal performance network management and frequency planning for avoidance of co-existence issues Proposal for Factory AutomationGoals Michael Bahr, Siemens AG

  5. star topology gateway devices sensors:unidirectional data exchange from devices to gateway actuators: bidirectional data exchange between devices and gateway management devices (temporary) Proposal for Factory AutomationMain Ideas: Network Topology Michael Bahr, Siemens AG

  6. Proposal for Factory AutomationMain Ideas: General Concept • IEEE 802.15.4 PHY frames • Time Division Multiple Access • superframe with timeslots of fixed (base) length (can be brief) • shared group timeslots with CSMA • flexible configuration of superframe structure • addressing based on timeslot location or short address • modified MAC frame with very short header (1 octet) • new frame type for differentiation • reduces overhead  reduced latency • Roaming capability Michael Bahr, Siemens AG

  7. TDMA Superframe • Superframe • starts with beacon • followed by n base timeslots of equal, fixed length • Timeslots • one device per timeslot (dedicated timeslot) • multiple devices per timeslot (shared group timeslot) • determinism • (re-)synchronization through beacon • allows sleep mode / power save of devices Michael Bahr, Siemens AG

  8. Shared Group Timeslots • more than one device per timeslot • (simplified) carrier sense multiple access within shared group timeslot • guaranteed access for designated device, contention-based access for other devices • 1 or more continuous timeslots concatenated to a shared group timeslot • all timeslots in single shared group timeslot  network with CSMA • mixture between fixed, deterministic timeslots and shared group timeslots possible • further details in 15-08/0827r0 Michael Bahr, Siemens AG

  9. Structure of Superframe • existence of management timeslots configurable during setup • number of (timeslots for) sensors and actuators configurable during setup • first sensor time slots may be reserved for dynamic retransmissions • time slot for GACK configurable Michael Bahr, Siemens AG

  10. Very Short MAC Frame Format • implicit addressing through slot number • omits MAC address fields in MAC header • very short MAC header of 1 byte • very short PSDU increases efficiency dramatically • turnaround time / latency main criteria • FCS for error recognition Michael Bahr, Siemens AG

  11. Frame Type corresponds to frame type subfield of IEEE 802.15.4-2006 set to b100 indicates frames with shortened MAC header Shortened Frame Control • Sub Frame Type • indicates frame type with shortened MAC header • beacon, command, ack, data frame Michael Bahr, Siemens AG

  12. Transmission Modes • 3 transmission modes, signalled in beacon • Discovery • Configuration • Online • Discovery: network setup, addition of new devices • Configuration: (re-)configuration of network and devices • further details see 15-08/0571r1 Michael Bahr, Siemens AG

  13. Changes to Standard Section 5 • 5 General Description • 5.3 Network Topologies • added network concept for factory automation • 5.5. Functional Overview • 5.5.1 Superframe structure • added description of superframe structure for factory automation networks • new behavior defined when using frames with 1-octet MAC header • 5.5.2 Data transfer model • 5.5.3 Frame structure Michael Bahr, Siemens AG

  14. Changes to Standard Section 7 • 7.1 MAC sublayer service specification • MCPS.DATA • existing MLME primitives to be reviewed • new MLME-SFCF-SUPERFRAME-CONFIGURATION primitives • 7.2 MAC frame formats • new frame type b100 • contains four subtypes: data, ack, beacon, command • defined general frame format (7.2.1a) and individiual frame formats (7.2.2a) • different types of acknowledgement (e.g. group ack (GACK)) • 7.3 MAC command frames • new command frames defined • Discover Response • Configuration Response • Configuration Request • CTS Shared Group • Request to send (RTS) • Clear to Send (CTS) Michael Bahr, Siemens AG

  15. Changes to Standard Section 7 • 7.4 MAC constants and PIB attributes • new MAC constants defined • macFAnumTimeSlots • macFAnumSensorTS • macFAnumRetransmitTS • macFAnumActuatorTS • macFAmgmtTS • probably missed some Michael Bahr, Siemens AG

  16. Changes to Standard Section 7 • 7.5 MAC functional description • 7.5.1 Channel access • new clause „Superframe structure with beacons with shortened frame control” • superframe definition • timeslot description • channel access in dedicated and shared group timeslots • 7.5.1.4 CSMA-CA algorithm • extension with simplified scheme for shared group timeslots (tbd) • 7.5.7a Transmission modes in factory automation networks • new clause describing discover, configuration, and online modes • 7.5.2 Starting and maintaining PANs • 7.5.3 Association and disassociation • 7.5.4 Synchronization • 7.5.5 Transaction handling • 7.5.6 Transmission, reception, and acknowledgement • need to be reviewed and extended if necessary • 7.7 Message sequence charts • to be done Michael Bahr, Siemens AG

  17. Changes to Standard Annex • Annex D PICS proforma • to be done at the end • Annex Fa (informative) • motivation and lyrical explanation for factory automation networks Michael Bahr, Siemens AG

  18. References • 15-09-0401-00 „Draft Text for Factory Automation“ • 15-09-0228-00 “Proposal for Factory Automation“ • 15-08-0254-01 “Proposal for Factory Automation“ • 15-08-0827-00 „Shared Group Timeslots” • 15-08-0420-00 „Extending the MAC Superframe of 802.15.4 Spec” • 15-09-0199-00 „ Factory Automation Sub-Group Deliverables” • 15-09-0024-00 „Proposal for Factory Automation & MAC TG4e MAC Categories” Michael Bahr, Siemens AG

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