1. doc.: IEEE 802.15-08-0312- 15-08-0312-00-004e Submission May, 2008 Chol Su Kang, Kuor-Hsin Chang (Dust Networks, Freescale)Slide 1 Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [Enhancement to IEEE 802.15.4-2006 for Industrial Markets] Date Submitted: [8 May, 2008] Source: [Chol Su Kang, Kuor Hsin Chang] Company [Dust Networks, Freescale] Address [30695 Huntwood Avenue, Hayward, CA 94544; 890 N. McCarthy Blvd, Suite 120, Milpitas, CA 95035] Voice:[+1 510 400 2900, +1 408 904 2705], FAX: [+1 510 489 3799, +1 408 904 2732] E-Mail:[ckang@dustnetworks.com, Kuor-Hsin.Chang@freescale.com] Re: [n/a] Abstract:[This document proposes requirements and features of Industrial Markets for IEEE802.15.4 MAC] Purpose:[This document is a response to Item a) better support the industrial markets in IEEE P802.15.SG4e Call for Application] 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.

2. doc.: IEEE 802.15-08-0312- 15-08-0312-00-004e Submission May, 2008 Chol Su Kang, Kuor-Hsin Chang (Dust Networks, Freescale)Slide 2 Channel Hopping TDMA for Industrial Monitoring and Control Applications Chol Su Kang - Dust Networks Kuor Hsin Chang - Freescale May, 2008

3. doc.: IEEE 802.15-08-0312- 15-08-0312-00-004e Submission May, 2008 Chol Su Kang, Kuor-Hsin Chang (Dust Networks, Freescale)Slide 3 Target Applications Equipment and process monitoring Non-critical control Diagnostics/predictive maintenance Asset management

4. doc.: IEEE 802.15-08-0312- 15-08-0312-00-004e Submission May, 2008 Chol Su Kang, Kuor-Hsin Chang (Dust Networks, Freescale)Slide 4 Requirements Reliability and robustness Long operational life for battery powered devices (> 5 years) Co-existence Flexible and scale-able Coverage

5. doc.: IEEE 802.15-08-0312- 15-08-0312-00-004e Submission May, 2008 Chol Su Kang, Kuor-Hsin Chang (Dust Networks, Freescale)Slide 5 Oil Refinery – Double Coker Unit Scope limited to Coker facility and support units spanning over 1200ft No repeaters were needed to ensure connectivity Electrical/Mechanical contractor installed per wired practices >5 year life on C-cell GW 400m

6. doc.: IEEE 802.15-08-0312- 15-08-0312-00-004e Submission May, 2008 Chol Su Kang, Kuor-Hsin Chang (Dust Networks, Freescale)Slide 6 TDMA Each device-to-device communication happens within a scheduled timeslot All timeslots are contained within a cycle Cycle of timeslots repeats in time CCA before transmit in each and every timeslot Cycle Unallocated SlotAllocated Slot Tx Rx RX startup Transmit Packet: Preamble, SFD, Headers, Payload, CRC RX packetVerify CRC Calculate ACK CRC Transmit ACK RX startup or TX->RX RX ACK RX/TX turnaround CCA: RX startup, listen, RX->TX timeslot

7. doc.: IEEE 802.15-08-0312- 15-08-0312-00-004e Submission May, 2008 Chol Su Kang, Kuor-Hsin Chang (Dust Networks, Freescale)Slide 7 TDMA Basics Schedule link activity Time synchronization required for devices in the network: –Specification on time difference tolerances –Time synchronization mechanisms Transmission starts at a specified time after the beginning of a slot: –Allow the source and destination to set their frequency channel –Allow the receiver to begin listening

8. doc.: IEEE 802.15-08-0312- 15-08-0312-00-004e Submission May, 2008 Chol Su Kang, Kuor-Hsin Chang (Dust Networks, Freescale)Slide 8 Channel Hopping Combined with TDMA to enhance reliability 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 802.15.4 Channels Cycle n Cycle n-1 Cycle n-2 Cycle n+1 Cycle n+2

9. doc.: IEEE 802.15-08-0312- 15-08-0312-00-004e Submission May, 2008 Chol Su Kang, Kuor-Hsin Chang (Dust Networks, Freescale)Slide 9 Channel Hopping Frequency Diversity –Reduce the effect of Interference and Multipath Fading Channel Diversity –One time slot can be used by multiple links at the same time Within a network, each device has identical channel lists

10. doc.: IEEE 802.15-08-0312- 15-08-0312-00-004e Submission May, 2008 Chol Su Kang, Kuor-Hsin Chang (Dust Networks, Freescale)Slide 10 CADACADA B C Link = (Time Slot, Channel Offset) A Time Chan. offset BABA BABA One Slot D The two links from B to A are dedicated D and C share a link for transmitting to A The shared link does not collide with the dedicated links BCBC FE BEBFBEBF

11. doc.: IEEE 802.15-08-0312- 15-08-0312-00-004e Submission May, 2008 Chol Su Kang, Kuor-Hsin Chang (Dust Networks, Freescale)Slide 11 Channel Hopping Each link rotates through k available channels over k cycles. –Ch # = Chan Hopping Seq. Table ( ( ASN + Channel Offset) % Number_of_Channels ) Blacklisting can be defined globally and locally. Time Channel Offset Cycle N Cycle N+1 Cycle N+2 CADACADA BABA B  A (ch 15) BCBC BEBFBEBF CADACADA BABA B  A (ch25) BCBC BEBFBEBF CADACADA BABA B  A (ch18) BCBC BEBFBEBF ASN=N*4 ASN=N*4+1 ASN=(N+1)*4 ASN=N*4+2 ASN=N*4+3

12. doc.: IEEE 802.15-08-0312- 15-08-0312-00-004e Submission May, 2008 Chol Su Kang, Kuor-Hsin Chang (Dust Networks, Freescale)Slide 12 Built-In Flexibility and Scalability Trade performance and power –Sample & reporting rate –Latency –High bandwidth connections Tradeoffs can vary with –Time –Location –Events Use power intelligently if you’ve got it –Highest performance with powered infrastructure