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doc.: IEEE 802.15-<doc#>
<month year> doc.: IEEE <doc#> Project: IEEE P Working Group for Wireless Personal Area Networks (WPANs) Submission Title: Proposal for LPWA repeater Date Submitted: 07 September, 2018 Source: Kunmin Yeo, 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, 12 March 2018 Abstract: This is a proposal for single-hop LPWA repeater to resolve harsh environment applications. Purpose: Contribution to IEEE w 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>
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LPWA Frame Repeater for Harsh Environment Applications
<month year> doc.: IEEE <doc#> LPWA Frame Repeater for Harsh Environment Applications Kunmin Yeo, Tae-Joon Park, Seong-Soon Joo, Eun-Hee Kim ETRI <author>, <company>
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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>
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Underground water meter(I)
<month year> doc.: IEEE <doc#> Underground water meter(I) Harsh environment applications Water meters under the ground <author>, <company>
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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>
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Radiation pattern w/o metal cover
<month year> doc.: IEEE <doc#> Radiation pattern w/o metal cover <author>, <company>
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Radiation pattern w/ metal cover
<month year> doc.: IEEE <doc#> Radiation pattern w/ metal cover <author>, <company>
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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>
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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 <author>, <company>
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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>
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Proposals on Frame Repeater (III)
PHY level connection MAC Level connection
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Proposals on Frame Repeater (III)
Repeated Beacon Offset (macLpwaRepeaterBeaconOffset) GTS Reduced CAP Normal Beacon Repeated Beacon
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Proposals on Frame Repeater (V)
<month year> doc.: IEEE <doc#> Proposals on Frame Repeater (V) Amend the frame repeater LPWA End Device PHY Repeated Frame (0/1) LPWA repeater Command/Data Frame (1/0) Coordinator Repeated Beacon (0/1) Beacon Locate Tx timing of 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>
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Proposals on Frame Repeater (V)
<month year> doc.: IEEE <doc#> Proposals on Frame Repeater (V) Amend the 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>
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Proposals on Frame Repeater (VI)
<month year> doc.: IEEE <doc#> Proposals on Frame Repeater (VI) 5.5.1 Star network formation Add the following paragraph 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>
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Proposals on Single-hop LPWA Repeater (VI)
<month year> doc.: IEEE <doc#> Proposals on Single-hop LPWA Repeater (VI) 8.4.2 MAC PIB attributes Add the following attributes in Table 8-81 Attribute Type Range Description macLpwaRepeaterEnabled Boolean TRUE, FLASE A value of TRUE indicates that single-hop frame repeaters are used to extend the transmission range. macLpwaRepeaterBeaconOffset Integer - The time offset at the air interface from the trailing edge of the last chip (of the last symbol) of a received beacon to the time of transmitting the leading edge of the first chip (of the first symbol) of the repeated beacon, if phyLpwaRepeaterEnabled is set to TRUE. <author>, <company>
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Proposals on Single-hop LPWA Repeater (VI)
<month year> doc.: IEEE <doc#> Proposals on Single-hop LPWA Repeater (VI) PHR field format Add the following paragraph In a LPWA, if phyLpwaRepeaterEnabled is set to TRUE, the format of the PHR is shown in Figure xx-x where 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. Bits:0 1 2 3 4 5-15 Repeat Request Repeat Indicator Parity FCS Type Data Whitening Frame Length <author>, <company>
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