doc.: IEEE k Submission ETRI July 2011 Slide 1 Project: IEEE P Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [Preliminary Proposal for Low-Energy Wide Area Monitoring] Date Submitted: [July 15, 2011] Source: [Seong-Soon Joo, Bong-Soo Kim, Jong-Arm Jun, Cheol-Sig Pyo] Company: [ETRI] Address: [161 Gajeong-dong, Yuseong-gu, Daejeon, KOREA] Voice: [ ], FAX: [ ], Re: [IEEE 802 TG4k issues a call for proposal] Abstract: [As a preliminary proposal for TG4k, a conceptual design of low-energy wide area monitoring is provided.] Purpose:[To contribute the initial process of preparing draft for TG4k] 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

doc.: IEEE k Submission ETRI July 2011 Slide 2 Preliminary Proposal for Low-Energy Wide Area Monitoring Seong-Soon Joo*, Bong-Soo Kim, Jong-Arm Jun, Cheol-Sig Pyo ETRI

doc.: IEEE k Submission ETRI July 2011 Wide Area Monitoring Anticipated situation on wide area monitoring –sensors are spread on wide area one node per 10m x 10m ~ 100m x 100m area spread on 2km x 2km ~ 5km x 5km varying condition on radio paths –multiple kinds of sensors overlapped wide area, operated separately by different authorities flow meter, chemical sensor, seismic sensor, … water utility, gas utility, building maintenance companies, … it is not the way to manage the sensors as a whole network –coarse environment, hard to maintain or replace equipped underground, inside structure, under water, … maintenance cost will rise steadily Design goals of wide area monitoring –long lived infra more than 10 years life like network carrier’s infra –ease maintained monitoring network high degree of freedom to start the monitoring/maintenance business Slide 3

doc.: IEEE k Submission ETRI July 2011 Long Lived Infra Infra to support wide area –for a node 1~4 messages per hour ~100 bytes long message periodical or on-demand message –as a network one hop, large variation on length of radio paths: 10m ~ 3km more than 1,000 nodes managed overlapped with multiple operators’ networks wirelessly, geographically Infra to minimize waste of resource –for a node low duty cycle: 200ms wakeup for every 1 hour, 0.006% low energy for transmitting a bit high throughput rate: high possibility of successful transmitting and receiving a frame –as a network high throughput as a whole network minimize collision by resource contention, hidden nodes arbitration, unplanned misbehavior among network operators fair resource allocation Slide 4

doc.: IEEE k Submission ETRI July 2011 Long Lived Infra - continued Long lived requirements on layers –session, transport layer recover errors on end-to-end –network layer coordinated fair resource reservation among operators –link layer guaranteed and secured link connection fair access control –physical layer low powered reliable transmission Requirements on TG4k –PHY low powered reliable transmission support to fair access between near and far nodes support to coordinate network layers’ fair resource reservation –MAC guaranteed link access on low duty cycle with low energy support to fair access between near and far nodes minimize contention on a link Slide 5

doc.: IEEE k Submission ETRI July 2011 Ease Maintained Infra Ease maintained infra requirements –planning carrier grade infra adaptable structure able to launch a new business separable structure among multiple operators –installation ease to add or remove a node from the network ease to identify a network –operation & maintenance error free long lived node needs no maintenance enough simple network structure to detect a false node easily Requirements on TG4k –PHY low powered reliable transmission support to identify multiple networks –MAC support to ease installation support to make network structure simple support to identify multiple networks Slide 6

doc.: IEEE k Submission ETRI July 2011 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 Slide 7 operator 1 operator n operator 1 operator n

doc.: IEEE k Submission ETRI July 2011 PHY Proposal for LECIM Design requirements on PHY –low powered reliable transmission –support to fair access between near and far nodes –support to identify multiple networks low powered reliable transmission over 2km –sub GHz band –FEC coding, interleaving, spreading –MR-O-QPSK with (128,8) MDSSS spreading for 31.25kbps –short frame : 64 octets payload for 16ms packet duration fair access between near and far nodes –over the air control for power management –separate uplink and downlink on time space identify multiple networks –separate operators on frequency space or time space Slide 8

doc.: IEEE k Submission ETRI July 2011 MAC Proposal for LECIM Design requirements on MAC –guaranteed link access on low duty cycle with low energy –support to fair access between near and far nodes –minimize contention on a link –support to ease installation –support to make network structure simple –support to identify multiple networks Adopt IEEE e MAC –possible candidates DSME: beacon scheduling, channel diversity LLDN: customized to star topology, short frame header TSCH: flexible monitoring cycle CSL/RIT: asynchronous wakeup –how to adopt 4e MACs use it as is or … Slide 9

doc.: IEEE k Submission ETRI July 2011 MAC Proposal for LECIM - continued guaranteed link access on low duty cycle with low energy –TDMA MAC –manage over 1,000 nodes with 0.006% duty cycle BO=14: sec, need longer BI –synchronization with long beacon interval simple synchronization procedure recovering from clock drift –seeking a beacon at an orphaned node use sampled listening minimize contention on a link –TDMA MAC –support short PPDU limit the length of MSDU to 64 octets: 16ms packet duration, fragment at MAC layer support to fair access between near and far nodes –in case of repeater included infra DSME’s multi-frame structure and beacon scheduling support to ease installation –remove or simplify the configuration/association procedure support to identify multiple networks –time slot assigning rule, out of scope Slide 10

doc.: IEEE k Submission ETRI July 2011 Thanks for your Attention! Slide 11