doc.: IEEE 802.15-<doc#> <month year> doc.: IEEE 802.15-<doc#> Project: IEEE P802.15 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 P802.15.4w 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 TG4w 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. This work was supported by IITP funded by MSIT (No. R-20160227-002863, LPWA IoT 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 P802.15. <author>, <company>

LPWA Frame Repeater for Harsh Environment Applications <month year> doc.: IEEE 802.15-<doc#> LPWA Frame Repeater for Harsh Environment Applications Tae-Joon Park, Seong-Soon Joo, Eun-Hee Kim ETRI <author>, <company>

LPWA Services for Korea <month year> doc.: IEEE 802.15-<doc#> 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,” 15-17/0154r01, 2017 <author>, <company>

Underground water meter(I) <month year> doc.: IEEE 802.15-<doc#> Underground water meter(I) Harsh environment applications Water meters under the ground <author>, <company>

Underground water meter(II) <month year> doc.: IEEE 802.15-<doc#> Underground water meter(II) Cover Without metal cover Hm=300mm Dipole antenna(100mm) (4 - 35 dB less gain than free space) Water meter 13-40 dB decrease With metal cover Shield case (20 - 50 dB less gain than free space) <author>, <company>

Radiation pattern w/o metal cover <month year> doc.: IEEE 802.15-<doc#> Radiation pattern w/o metal cover <author>, <company>

Radiation pattern w/ metal cover <month year> doc.: IEEE 802.15-<doc#> Radiation pattern w/ metal cover <author>, <company>

Transmission range of underground water meter <month year> doc.: IEEE 802.15-<doc#> Transmission range of underground water meter Parameters Center Frequency : 920MHz TX output power : +14dBm RX sensitivity : -140dBm (+ 20dB) Margin of 20dB applied to guarantee wireless connectivity Height of node antenna @ 30m <author>, <company>

Proposals on Frame Repeater (I) <month year> doc.: IEEE 802.15-<doc#> 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 L2 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 <author>, <company>

Proposals on Frame Repeater (II) <month year> doc.: IEEE 802.15-<doc#> Proposals on Frame Repeater (II) Power Amplifier Legacy RF Repeater Uplink Device Signal Uplink Amplified RF Signal to Coordinator Frame Repeater(LPWA Repeater) Uplink Device Signal Uplink Amplified LPWA Signal to Coordinator A/D Demod Single-hop Frame Repeater function Mod D/A Amp <author>, <company>

Proposals on Frame Repeater (III) PHY level connection MAC Level connection

Proposals on Frame Repeater (IV) <month year> doc.: IEEE 802.15-<doc#> 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. <author>, <company>

Proposals on Frame Repeater (V) <month year> doc.: IEEE 802.15-<doc#> Proposals on Frame Repeater (V) Amend the frame repeater Add a sub section 10.2.8 PHY level frame repeater LPWA End Device PHY Repeated Frame(0/1) LPWA repeater Command/Data Frame (1/0) Coordinator Repeated Beacon (0/1) Beacon Extended contention period for Beacon Update repeat zone device list Bits:0 1 2 3 4 5-15 Repeat Request Repeat Indicator Parity FCS Type Data Whitening Frame Length <author>, <company>

Proposals on Frame Repeater (V) <month year> doc.: IEEE 802.15-<doc#> 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 Coordinator Repeated Frame (0/1) Command/Data Frame Filtering to repeat zone end device Bits:0 1 2 3 4 5-15 Repeat Request Repeat Indicator Parity FCS Type Data Whitening Frame Length <author>, <company>

Proposals on Single-hop LPWA Repeater (VI) <month year> doc.: IEEE 802.15-<doc#> 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 = b0  b1  b3  b4  b5  b6  b7  b8  b9  b10  b11  b12  b13  b14  b15 <author>, <company>

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