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: Single-hop LPWA repeater for harsh environment applications Date Submitted: 06 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>

Single-hop LPWA Repeater for Harsh Environment Applications <month year> doc.: IEEE 802.15-<doc#> Single-hop LPWA 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) Ground facility Management Streetlight, guardrail, tunnel, bridge, underground roadway, … Underground facility monitoring and control system Utility company(Electric Power System), Gas/Water, … Manhole, Temperature measurement, Fire detection… Manhole monitoring System Pilot program : SK telecom in KOREA Node-to-Gateway : IEEE802.15.4g PHY, IEEE802.15.4k PHY [1] Tae-Joon Park et al., “Potential Applications for LPWA Networks,” 15-17/0154r01, 2017 <author>, <company>

Domestic Constraints on LPWA <month year> doc.: IEEE 802.15-<doc#> Domestic Constraints on LPWA One of the most important issues in Korea[1] Mainly used in urban areas : High path-loss environment Most water meters are below the surface Smart meters(Gas, water, …) in dense residential areas It is not a distance issue <author>, <company>

Underground water meter Cover Without Iron cover Hm=300mm Dipole antenna(100mm) (4 - 35 dB less gain than free space) Water meter 13-40 dB decrease With Iron cover Shield case (20 - 50 dB less gain than free space)

Radiation pattern w/o iron cover

Radiation pattern w/ iron cover

Coverage comparison 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

Proposals on Single-hop Repeater (I) LPWA prefers direct delivery, but what if not? Work without complexity ; No installation and routing complexity  LPWA needs a Single-hop repeater Repeater : As simple as possible! Able to forward the message for a single hop Intermediate node in a data communications network, retransmitting data without modifying address information(BS EN 13757-5:2015) Limited functionality but Needs for low cost meters

Proposals on Single-hop LPWA Repeater (II) <month year> doc.: IEEE 802.15-<doc#> Proposals on Single-hop LPWA Repeater (II) Limited to PHR modification <author>, <company>

Proposals on Single-hop LPWA Repeater (III) Delay Unregistered repetition Random repetition delay, CAP Registered repetition Deterministic/Random repetition delay, CAP/CFP A/D Uplink Device Signal Uplink Amplified LPWA Signal to Coordinator Demod Mod D/A Amp Single-hop LPWA Repeater Single-hop LPWA Repeater function Power Amplifier Legacy Repeater Uplink Device Signal Uplink Amplified RF Signal to Coordinator

Proposals on Single-hop LPWA Repeater (IV) Amend the LPWA Single-hop repeater Add phrases 5.5.1 Star network formation While maintaining the star topology, a single-hop LPWA repeater can be used to complement poor communication environment, such as underground metering services.

Proposals on Single-hop LPWA Repeater (V) Amend the LPWA Single-hop repeater Add a sub section 10.2.8 PHY level repeater LPWA Device PHY Repeater Enable set(1/0/0) LPWA repeater Repeat Status set (1/1/0) w/ RepeaterID Coordinator Repeat Status set(1/1/1) Repeat Enable set(1/0/1) Bits:0 1 2 3 4 5-15 16 17-23 Repeater Enable Repeat Status Parity FCS Type Data Whitening Frame Length Up / Down Repeater ID

Proposals on Single-hop LPWA Repeater (VI) Amend the LPWA Single-hop 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 16 17-23 Repeater Enable Repeat Status Parity FCS Type Data Whitening Frame Length Up / Down Repeater ID 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

Thank you very much for your attention Any Questions?