July 2018 doc IEEE 802 15 18 0295

July 2018 doc. : IEEE 802. 15 -18 -0295 -01 -004 w Project: IEEE P 802. 15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: LPWA frame repeater for harsh environment applications Date Submitted: 10 July, 2018 Source: Tae-Joon Park, Seong-Soon Joo, Eun-Hee Kim Company: ETRI Address: 218 Gajeong-ro, Yuseong-gu, Daejeon, 34129, KOREA Voice: +82 -42 -860 -6902, E-Mail: tjpark@etri. re. kr Re: IEEE P 802. 15. 4 w Low Power Wide Area Call for Proposals Abstract: This is a preliminary proposal for amending the single-hop LPWA repeater to resolve the harsh environment applications. Purpose: Preliminary proposal for IEEE 802. 15 TG 4 w Notice: This document has been prepared to assist the IEEE P 802. 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. This work was supported by IITP funded by MSIT (No. R-20160227 -002863, LPWA Io. T network core technology development). Release: The contributor acknowledges and accepts that this contribution becomes the property of IEEE and may be made publicly available by P 802. 15. Submission Slide 1 ETRI

July 2018 doc. : IEEE 802. 15 -18 -0295 -01 -004 w LPWA Frame Repeater for Harsh Environment Applications Tae-Joon Park, Seong-Soon Joo, Eun-Hee Kim ETRI Submission Slide 2 ETRI

July 2018 doc. : IEEE 802. 15 -18 -0295 -01 -004 w LPWA Services for Korea • UIS(Urban Information System) – Infrastructure of Utility company • Electric Power line, Gas/Water line, … • Manhole, Temperature measurement, Fire detection… – Utility monitoring environment • Water meters are usually located under the ground • Smart meters(Gas, water, …) in harsh environment [1] Tae-Joon Park et al. , “Potential Applications for LPWA Networks, ” 15 -17/0154 r 01, 2017 Submission Slide 3 ETRI

July 2018 doc. : IEEE 802. 15 -18 -0295 -01 -004 w Underground water meter(I) • Harsh environment applications – Water meters under the ground Submission Slide 4 ETRI

July 2018 doc. : IEEE 802. 15 -18 -0295 -01 -004 w Underground water meter(II) Cover Without metal cover Hm=300 mm Dipole antenna(100 mm) (4 - 35 d. B less gain than free space) Water meter 13 -40 d. B decrease With metal cover Shield case (20 - 50 d. B less gain than free space) Submission Slide 5 ETRI

July 2018 doc. : IEEE 802. 15 -18 -0295 -01 -004 w Radiation pattern w/o metal cover Submission Slide 6 ETRI

July 2018 doc. : IEEE 802. 15 -18 -0295 -01 -004 w Radiation pattern w/ metal cover Submission Slide 7 ETRI

July 2018 doc. : IEEE 802. 15 -18 -0295 -01 -004 w Transmission range of underground water meter • Parameters – Center Frequency : 920 MHz – TX output power : +14 d. Bm – RX sensitivity : -140 d. Bm (+ 20 d. B) • Margin of 20 d. B applied to guarantee wireless connectivity Height of node antenna @ 30 m Submission Slide 8 ETRI

July 2018 doc. : IEEE 802. 15 -18 -0295 -01 -004 w Proposals on Frame Repeater (I) • LPWA is based on star topology. • But, when the harsh environment limits the transmission range, – It is required to extend the range. • Possible solutions – RF repeater • Not only signal but Noise is also amplified – L 2 relaying • It is not one hop star topology. • Additional procedures are needed to form a relay link • We propose frame repeater – Operated in Un-sloted beacon enabled PAN Submission Slide 9 ETRI

July 2018 doc. : IEEE 802. 15 -18 -0295 -01 -004 w Proposals on Frame Repeater (II) Legacy RF Repeater Uplink Device Signal Uplink Amplified RF Signal to Coordinator Power Amplifier Frame Repeater(LPWA Repeater) Uplink Device Signal Submission A/D Demod Single-hop Frame Repeater function Slide 10 Mod D/A Uplink Amplified LPWA Signal to Coordinator Amp ETRI

July 2018 doc. : IEEE 802. 15 -18 -0295 -01 -004 w Proposals on Frame Repeater (III) PHY level connection MAC Level connection Submission Slide 11 ETRI

July 2018 doc. : IEEE 802. 15 -18 -0295 -01 -004 w Proposals on Frame Repeater (IV) • Amend the Frame repeater – Add phrases • 5. 5. 1 Star network formation • For the LPWA star topology, a single-hop frame repeater may be used to extend the transmission range for connecting the end devices in harsh communication environment. Submission Slide 12 ETRI

July 2018 doc. : IEEE 802. 15 -18 -0295 -01 -004 w Proposals on Frame Repeater (V) • Amend the frame repeater – Add a sub section • 10. 2. 8 PHY level frame repeater LPWA End Device PHY LPWA repeater PHY Coordinator PHY Beacon Repeated Beacon (0/1) Extended contention period for Beacon Command/Data Frame (1/0) Update repeat zone device list Repeated Frame(0/1) Bits: 0 1 2 3 4 5 -15 Repeat Request Repeat Indicator Parity FCS Type Data Whitening Frame Length Submission Slide 13 ETRI

July 2018 doc. : IEEE 802. 15 -18 -0295 -01 -004 w Proposals on Frame Repeater (V) • Amend the Frame repeater – Add a sub section • 10. 2. 8 PHY level frame repeater LPWA repeater PHY LPWA End Device PHY Coordinator PHY Command/Data Frame Filtering to repeat zone end device Repeated Frame (0/1) Bits: 0 1 2 3 4 5 -15 Repeat Request Repeat Indicator Parity FCS Type Data Whitening Frame Length Submission Slide 14 ETRI

July 2018 doc. : IEEE 802. 15 -18 -0295 -01 -004 w Proposals on Single-hop LPWA Repeater (VI) • Amend the Frame repeater – Add a field • 24. LECIM FSK PHY specification • 24. 2. 2 PHR field format(in IEEE Std 802. 15. 4 -2015) Bits: 0 1 2 3 4 5 -15 Repeat Request Repeat Indicator Parity FCS Type Data Whitening Frame Length The Parity field is calculated in the following way: Parity field = b 0 b 1 b 3 b 4 b 5 b 6 b 7 b 8 b 9 b 10 b 11 b 12 b 13 b 14 b 15 Submission Slide 15 ETRI

July 2018 doc. : IEEE 802. 15 -18 -0295 -01 -004 w Thank you very much for your attention Any Questions? Submission Slide 16 ETRI