1. doc.: IEEE 802.15-11-0600-00-004k Submission ETRI Sep 2011 Slide 1 Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [Link Management for Low-Energy Wide Area Monitoring] Date Submitted: [Sep 15, 2011] Source: [Seong-Soon Joo, Hyunhak Kim, Jong-Arm Jun] Company: [ETRI] Address: [161 Gajeong-dong, Yuseong-gu, Daejeon, KOREA] Voice: [+82-42-860-6333], FAX: [+82-42-860-4197], E-Mail: [ssjoo@etri.re.kr] Re: [IEEE 802 TG4k issues a call for proposal] Abstract: [Link management for low-energy wide area monitoring is proposed.] Purpose:[To contribute the initial process of preparing draft for TG4k] 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 802.15-11-0600-00-004k Submission ETRI Sep 2011 Slide 2 Link Management for Low-Energy Wide Area Monitoring Seong-Soon Joo*, Hyunhak Kim, Jong-Arm Jun ETRI

3. doc.: IEEE 802.15-11-0600-00-004k Submission ETRI Sep 2011 Slide 3 LECIM Network Reference Model Components of LECIM network –coordinator, device –repeater Topology of LECIM network –near node, far node –linear, group, distributed –range coordinator repeater device near node far node linear group distributed

4. doc.: IEEE 802.15-11-0600-00-004k Submission ETRI Sep 2011 Slide 4 LECIM Network Data Model (I) Traffic in a device –upward sensing data device status report device join device alarming –downward data ACK time synchronization device management command Traffic in LECIM network –attributes number of devices feature of device: data size, frequency interference model, contention probability –traffic in busy hour –traffic in off hour

5. doc.: IEEE 802.15-11-0600-00-004k Submission ETRI Sep 2011 Slide 5 LECIM Network Data Model (II) Data in LECIM network –sensing/measuring data contents –device/location ID : 2 ~ 4 bytes –time stamp : 2 ~ 4 bytes, (NTP : 8~ 16 bytes) –monitoring data vector data : 1 ~ 100 bytes stream data : 4 Kbyte x n frame/s frequency in appearance –periodic data : 1 ~ 1,440 event/day –occasional data : –operation & management data device maintenance data –device installation –device fault diagnosis & maintenance network operation data –global clock time synchronization –device status check

6. doc.: IEEE 802.15-11-0600-00-004k Submission ETRI Sep 2011 Slide 6 Possible Infra Structures Star topology –power free collector –multi-channel transceivers in a collector –synchronized/asynchronous resource allocation –power management on end point –identify operators at PHY or MAC layer Multi-hop topology with repeater –synchronized resource allocation for each hop –upward/downward forwarding at the MAC layer operator 1 operator n

7. doc.: IEEE 802.15-11-0600-00-004k Submission ETRI Sep 2011 Slide 7 Link Repeater Extend reaches of link –varying RF environment from/to coordinator –devices are located sparsely –extend reaches of link from/to coordinator Link repeater –echo back a frame after receiving a frame from the coordinator or devices –link repeater is power-free or located at ease maintainable place –two modes of link repeater according to the limitation on power resource device repeater coordinator

8. doc.: IEEE 802.15-11-0600-00-004k Submission ETRI Sep 2011 Slide 8 Power Management Link power management –reduce interference range –adaptable to radio environmental variance –extend life of near end device Power control procedure –measure the distance to coordinator detect radio energy from coordinator adjust TX power level reply back to coordinator –feedback from coordinator adjust TX power level coordinatordevice DeviceStausRepReq measure RSSI, LQI adjust TX power level DeviceStausRep DeviceStausRepReq (RSSI, LQI) adjust TX power level DeviceStausRep near node far node hidden node contention node coordinator

9. doc.: IEEE 802.15-11-0600-00-004k Submission ETRI Sep 2011 Slide 9 Link for Management management links –broadcast down-link –bidirectional management slot link –bidirectional device owned slot link broadcast down-link –management data on beacon bidirectional management slot link bidirectional link number of slots are predefined bidirectional device owned slot link –assigned slot to a device –periodic open or device/coordinator request based open beacon TS 0x10TS 0x11 TS 0x1f TS 0x0f TS 0x00 beacon 16*2 BO-SO -1 coordinator beacon TS 0x01 beacon BSMS1MS2 BS

10. doc.: IEEE 802.15-11-0600-00-004k Submission ETRI Sep 2011 Slide 10 LECIM MAC Procedure coordinatordevice Beacon get BO, SO, MO, set WO estimate next beacon arrival time Beacon adjust clock drift sleep Beacon wakeup at BI*2 WO wait beacon adjust clock drift DeviceStatusRepReq/ DeivceLinkControl manage device link infor DeviceStausRep sleep Data wakeup at device time slot tx data with grade0 link wait ACK ACK Data wakeup at device time slot tx data with grade2 link sleep i) join to LECIM network ii) link management iii) data transmission

11. doc.: IEEE 802.15-11-0600-00-004k Submission ETRI Sep 2011 Slide 11 Amendment to TG4e MAC PIB –add macLECIMlinkInfor MAC management primitive & command –add MLME-LECIM-STATUS –add MLME-LECIM-LINK –add device status report command MAC frame format –beacon format

12. doc.: IEEE 802.15-11-0600-00-004k Submission ETRI Sep 2011 Slide 12 Thanks for your Attention! ssjoo@etri.re.kr