1. doc.: IEEE 802.15-<doc#>
<month year>
doc.: IEEE <doc#>
Project: IEEE P 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: ,
Re: IEEE P 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 TG4w
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. This work was supported by IITP funded by MSIT (No. R , 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 P
<author>, <company>

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

3. LPWA Services for Korea
<month year>
doc.: IEEE <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>

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

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

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

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

8. Transmission range of underground water meter
<month year>
doc.: IEEE <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>

9. Proposals on Frame Repeater (I)
<month year>
doc.: IEEE <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>

10. Proposals on Frame Repeater (II)
<month year>
doc.: IEEE <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>

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

12. Proposals on Frame Repeater (IV)
<month year>
doc.: IEEE <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>

13. Proposals on Frame Repeater (V)
<month year>
doc.: IEEE <doc#>
Proposals on Frame Repeater (V)
Amend the frame repeater
Add a sub section
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>

14. Proposals on Frame Repeater (V)
<month year>
doc.: IEEE <doc#>
Proposals on Frame Repeater (V)
Amend the Frame repeater
Add a sub section
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>

15. Proposals on Single-hop LPWA Repeater (VI)
<month year>
doc.: IEEE <doc#>
Proposals on Single-hop LPWA Repeater (VI)
Amend the Frame repeater
Add a field
24. LECIM FSK PHY specification
PHR field format(in IEEE Std )
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>

16. Thank you very much for your attention Any Questions?