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July 2009 doc.: IEEE 802.15-09/0411r2 July 2009 Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [ Factory.

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Presentation on theme: "July 2009 doc.: IEEE 802.15-09/0411r2 July 2009 Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [ Factory."— Presentation transcript:

1 July 2009 doc.: IEEE /0411r2 July 2009 Project: IEEE P Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [ Factory Automation Draft Text Introduction ] Date Submitted: [15 July 2009 ] Source: [ Michael Bahr ] Company [ Siemens AG ] Address [ Otto-Hahn-Ring 6, Munich, Germany ] Voice:[ ], FAX: [ ], [ 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 P 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 P Michael Bahr, Siemens AG Michael Bahr, Siemens AG

2 Factory Automation Draft Text Introduction
July 2009 doc.: IEEE /0411r2 July 2009 Factory Automation Draft Text Introduction Michael Bahr (Siemens AG) Michael Bahr, Siemens AG Michael Bahr, Siemens AG

3 Factory Automation Subgroup
July 2009 Factory Automation Subgroup Michael Bahr (Siemens AG) Zafer Sahinoglu, editor (Mitsubishi Electric Research Labs) Rudy Belliardi (Schneider Electric) Paul Dixon (HiSilicon Technologies Co., LTD.) Jose Gutierrez (Emerson ) Ryoji Ono (Mitsubishi Electric) Rene Struik (Certicom) Ludwig Winkel (Siemens AG) Michael Bahr, Siemens AG

4 Changes Since Last Presentation
July 2009 Changes Since Last Presentation Draft text updates further polishing of draft text further integration of factory automation proposal into IEEE text filled several tbds in normative text, transition of terminology from Factory Automation Network to Low Latency Network current version: 15-09/0401r1 editor: Zafer Sahinoglu (Mitsubishi Electric Research Labs) Next steps editor to integrate with other draft texts fill remaining tbds Michael Bahr, Siemens AG

5 Proposal for Factory Automation Goals
July 2009 Proposal for Factory Automation Goals Requirements usage in factory automation possible high determinism / low latency: transmission of sensor data in  10 ms for 15 devices roaming coexistence with IEEE 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 Michael Bahr, Siemens AG

6 Proposal for Factory Automation Main Ideas: Network Topology
July 2009 Proposal for Factory Automation Main Ideas: Network Topology star topology gateway devices sensors: unidirectional data exchange from devices to gateway actuators: bidirectional data exchange between devices and gateway management devices (temporary) Michael Bahr, Siemens AG

7 Proposal for Factory Automation Main Ideas: General Concept
July 2009 Proposal for Factory Automation Main Ideas: General Concept IEEE 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

8 TDMA Superframe Superframe Timeslots
July 2009 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

9 Shared Group Timeslots
July 2009 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

10 Structure of Superframe
July 2009 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

11 Very Short MAC Frame Format
July 2009 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

12 Shortened Frame Control
July 2009 Shortened Frame Control Frame Type corresponds to frame type subfield of IEEE set to b100 indicates frames with shortened MAC header Sub Frame Type indicates frame type with shortened MAC header beacon, command, ack, data frame Michael Bahr, Siemens AG

13 Transmission Modes 3 transmission modes, signalled in beacon
July 2009 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

14 A Related PHY Preamble Issue
July 2009 A Related PHY Preamble Issue not part of this proposal, but would be useful would fall into the scope of IEEE f/g Problem transmissions on channel x might be received on channel (x-1), not only as interference!, due to receiver sensitivity. devices on channel (x-1) might consider such a transmission as belonging to their channel consequences for channel access Proposed solution different PHY preamble depending on channel  devices (chips) cannot synchronize to received transmission on neighboring channels Michael Bahr, Siemens AG

15 Changes to Standard Section 5
July 2009 doc.: IEEE /0411r2 July 2009 Changes to Standard Section 5 5 General Description 5.3 Network Topologies added network concept for low latence networks 5.5. Functional Overview 5.5.1 Superframe structure added description of superframe structure for low latency 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 Michael Bahr, Siemens AG

16 Changes to Standard Section 7
July 2009 doc.: IEEE /0411r2 July 2009 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 Michael Bahr, Siemens AG

17 Changes to Standard Section 7
July 2009 doc.: IEEE /0411r2 July 2009 Changes to Standard Section 7 7.4 MAC constants and PIB attributes new MAC constants defined macFAlowlatencePAN macFAnumTimeSlots macFAnumSensorTS macFAnumRetransmitTS macFAnumActuatorTS macFAmgmtTS probably missed some Michael Bahr, Siemens AG Michael Bahr, Siemens AG

18 Changes to Standard Section 7
July 2009 doc.: IEEE /0411r2 July 2009 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 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 Michael Bahr, Siemens AG

19 Changes to Standard Annex
July 2009 doc.: IEEE /0411r2 July 2009 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 Michael Bahr, Siemens AG

20 References 15-09-0401-01 „Draft Text for Factory Automation“
July 2009 References „Draft Text for Factory Automation“ “Proposal for Factory Automation“ “Proposal for Factory Automation“ „Shared Group Timeslots” „Extending the MAC Superframe of Spec” „ Factory Automation Sub-Group Deliverables” „Proposal for Factory Automation & MAC TG4e MAC Categories” Michael Bahr, Siemens AG

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