1 / 21

Hardware Challenges and Their Resolution in Advancing WirelessHART

Hardware Challenges and Their Resolution in Advancing WirelessHART. Authors: Xiuming Zhu 1 , Song Han 1 , and Aloysius Mok 1 1 The Department of Computer Science, the University of Texas at Austin Deji Chen 2 , and Mark Nixon 2 2 Emerson Process Management

ohio
Télécharger la présentation

Hardware Challenges and Their Resolution in Advancing WirelessHART

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Hardware Challenges and Their Resolution in Advancing WirelessHART Authors:Xiuming Zhu1, Song Han1, and Aloysius Mok1 1The Department of Computer Science, the University of Texas at Austin Deji Chen2, and Mark Nixon2 2Emerson Process Management Presenter: Yi-Hung Wei1

  2. Introduction • Wireless Personal Area Network(WPAN) • IEEE 802.15.4 • ZigBee • Industrial Wireless Network • Timing requirement, reliability, security concerns • WirelessHART • IEEE 802.15.4 • Hardware challenges 2003 2004 2005 2006 2007 2008 2009 IEEE 802.15.4 ZigBee WirelessHART FreeScale MC1322

  3. Properties Real-Time • TDMA Technology • Centralized Network Management Reliability • Channel Hopping and Channel Blacklisting • Mesh Networking Security • Data Integrity on MAC Layer • Data Confidentiality on the Network Layer IEEE 9th International Conference on Industrial Informatics, INDIN'2011

  4. WirelessHART Mesh Network IEEE 9th International Conference on Industrial Informatics, INDIN'2011

  5. Outline • Hardware Challenges • Development of WirelessHART • Early Prototype • Wi-HTest • Current System • Future work IEEE 9th International Conference on Industrial Informatics, INDIN'2011

  6. Hardware Challenge: MCU Speed • TDMA data link layer • Timeslot: 10ms • TsTxAckDelay: 1ms • Security mechanism • MAC layer related processing • Authenticate the incoming message • Generate authentication code WirelessHART Slot Timing IEEE 9th International Conference on Industrial Informatics, INDIN'2011

  7. Hardware Challenge: Memory Size Network Layer Minimum Requirement Data Link Layer Minimum Requirement IEEE 9th International Conference on Industrial Informatics, INDIN'2011

  8. Hardware Challenge: Clock Precision • WirelessHART network is a synchronized network • 10ppm drift rate of the MCU clock. • The maximum tolerance for drift is 1ms • Synchronize every 50secs between master and slave. • If the chain from time source is longer, the time to sync is shorter. IEEE 9th International Conference on Industrial Informatics, INDIN'2011

  9. Outline • Hardware Challenges • Development of WirelessHART • Early Prototype • Wi-HTest • Current System • Future work IEEE 9th International Conference on Industrial Informatics, INDIN'2011

  10. Early Prototype • 802.15.4 chips available in early day * J. Song, S. Han, A. K. Mok, D. Chen, M. Lucas, M. Nixon, and W. Pratt, WirelessHART: Applying Wireless Technology in Real-Time Industrial Process Control. Real-Time Technology and Applications Symposium, 2008. * J. Song, S. Han, X. Zhu, A. K. Mok, D. Chen, and M. Nixon, Demo of a Complete WirelessHART Network, ACM SenSys 2008 Demo Session. IEEE 9th International Conference on Industrial Informatics, INDIN'2011

  11. Early Prototype - resolution • Some observations • MCU • Only tested with 20ms, 40ms timeslots • Software AES engine • MC1321 software AES engine • Transmitter • Maximum programmable transmit power is only 3dBm • RAM • 4KB is too limited 10ms Hardware AES 10dBm IEEE 9th International Conference on Industrial Informatics, INDIN'2011

  12. Outline • Hardware Challenges • Development of WirelessHART • Early Prototype • Wi-HTest • Current System • Future work IEEE 9th International Conference on Industrial Informatics, INDIN'2011

  13. Wi-HTest • Motivation • Assure the standard compliance of WirelessHART devices • Thorough tests for each layer of WirelessHART stacks are needed • Help vendors avoid expensive product recalls and technical support costs • Hardware architecture • FreeScale MC1320 • Physical layer, data link layer • ColdFireV1 MCU, 32-bit, 50.33MHz • 128KB FLASH • 16KB RAM • PC Box • Network layer S. Han, J. Song, X. Zhu, A. K. Mok, D. Chen, M. Nixon, W. Pratt, and V. Gondhalekar, Wi-HTest: Compliance Test Suite for Diagnosing Devices in Real-Time WirelessHART Network. Real-Time Technology and Applications Symposium, 2009.

  14. Wi-HTest • Clock precision • ±2.5ppm oscillator as the external clock input • The drift is consistent in fixed environment • It is possible to compensate it with software • Security computation • CCM algorithm is still expensive • Parallel decoding • Pre-compute acknowledgement message • Flash Memory Usage IEEE 9th International Conference on Industrial Informatics, INDIN'2011

  15. Outline • Hardware Challenges • Development of WirelessHART • Early Prototype • Wi-HTest • Current System • Future work IEEE 9th International Conference on Industrial Informatics, INDIN'2011

  16. Current System • Hardware • FreeScale MC1322 • 32-bit 24MHz ARM7 MCU • 22mA typical RX current draw • 29mA typical TX current draw • Extensive sleep mode • MAC accelerator • Advanced AES hardware engine • Software • Complete WirelessHART mesh networking functionality IEEE 9th International Conference on Industrial Informatics, INDIN'2011

  17. Current System – cont. • 10 devices and 1 AP in the system • Devices publish data to GW with different sampling rates (1sec – 8sec) • Retry happens but no packet loss is detected

  18. Outline • Hardware Challenges • Development of WirelessHART • Early Prototype • Wi-HTest • Current System • Future work IEEE 9th International Conference on Industrial Informatics, INDIN'2011

  19. For future work • Memory • 96K Flash for WirelessHART stack • 24K RAM for the data section • More space for application layer • Clock • High precision • Maintains precision when sleep • Power • More sensitive receiver • More deeper sleep mode • Encryption • Hardware AES engine or fast MCU • Open AES engine IEEE 9th International Conference on Industrial Informatics, INDIN'2011

  20. Summary • Chronicle our work and provide our experience of the system design challenge of WirelessHART • Prototype • Wi-Htest • Complete WirelessHART mesh network • Provide hardware requirement for future industrial wireless embedded network chip IEEE 9th International Conference on Industrial Informatics, INDIN'2011

  21. Thank You! Comments? IEEE 9th International Conference on Industrial Informatics, INDIN'2011

More Related