Prof. Roberto Verdone www.robertoverdone.org

Telecomunicazioni LoRaWAN

Roberto Verdone www.robertoverdone.org

Prof. Roberto Verdone www.robertoverdone.org

Ø  ExtendedCoverageo  LargeAreaso  Environmentswithpoorcoverage

Basement

20km

Scenario

Prof. Roberto Verdone www.robertoverdone.org

Ø  LongRange:ZigBee/802.15.4o  Multi-hop

Ø  LongRange:LPWANo  Single-hop

CoordinatorRouter

Source

SourceSink

MoreEnergyConsumed(Routers)Routing/Synchoverhead

SimplerLowerTXPower

LPWAN.HowtoachieveLongRange?

Prof. Roberto Verdone www.robertoverdone.org

Ø  NarrowBandtransmissiono  LessNoise

Ø  Diversity

LPWAN.HowtoachieveLongRange?

NoiseFloorWideBand

NarrowBandSamePower

BetterSNR

0 1 2 3

Time

Prof. Roberto Verdone www.robertoverdone.org

LPWANTechnologies

ISMBand CellularBand

LTE Cat.0 3GPP: Rel. 12

LTE-M3GPP:Rel.13

NB-IOT3GPP:Rel.13

LoRa

SigFox

Weightless

EC-GSM-IoT

LPWAN

Prof. Roberto Verdone www.robertoverdone.org

Ø  StarTopologyØ  Contentionbasedaccess(Aloha-like)

LoRaWANTechnology:Overview

CollisionsServer Internet

Prof. Roberto Verdone www.robertoverdone.org

Ø  PacketmaybereceivedbydifferentGWo  Diversitygain

Ø  NetworkrepliesthroughthebestGW

BestGW

Server

LoRaWANTechnology:Overview

Internet

Prof. Roberto Verdone www.robertoverdone.org

LoRaWAN:MACØ  ClassA:2RXwindows:EDlistensonlyinthesewindows,otherwiseitsleeps

RX2ignoredIfdatapresent

InRX1

IfEDdoesn’tdetectapreamble

thewindowisclosed

immediatelytosaveenergy

RX1

GW

EDTX RX2

1sec

GW

EDTX RX1 RX2

Prof. Roberto Verdone www.robertoverdone.org

Ø  ChirpSpreadingSpectrum(CSS)

LoRa:PhysicalLayer

Symbo

l

InformationBW={125,250}kHz

433/868MHz

Prof. Roberto Verdone www.robertoverdone.org

Ø  SpreadingFactor(SF)Symbol(SF6)

Symbol(SF12)

ProcessingGain

Spreading Factor

Receiver Sensitivity

[dBm]

Bitrate [bps]

6 -121 9375 7 -124 5469 8 -127 3125 9 -130 1758

10 -133 977 11 -135 537 12 -137 293

+3dBeachSFincrease

LoRa:PhysicalLayer

time

frequency

band

Prof. Roberto Verdone www.robertoverdone.org

Ø  SpreadingFactor(SF)Symbol(SF6)

Symbol(SF12)

ProcessingGain

Spreading Factor

Receiver Sensitivity

[dBm]

Bitrate [bps]

6 -121 9375 7 -124 5469 8 -127 3125 9 -130 1758

10 -133 977 11 -135 537 12 -137 293

+3dBeachSFincrease

LoRa:PhysicalLayer

time

frequency

band

Increasingrange

Prof. Roberto Verdone www.robertoverdone.org

Ø  SpreadingFactor(SF)Symbol(SF6)

Symbol(SF12)

ProcessingGain

Spreading Factor

Receiver Sensitivity

[dBm]

Bitrate [bps]

6 -121 9375 7 -124 5469 8 -127 3125 9 -130 1758

10 -133 977 11 -135 537 12 -137 293

+3dBeachSFincrease

LoRa:PhysicalLayer

time

frequency

band

increasingrate

Prof. Roberto Verdone www.robertoverdone.org

LoRa:TimeonAir

Prof. Roberto Verdone www.robertoverdone.org

LoRaWAN

ERC Recommendation 70-03 “Relating to the use of Short Range Devices (SRD)”, CEPT

Prof. Roberto Verdone www.robertoverdone.org

LoRaWANfrequenciesCarrierFrequency Bandwidth Dutycycle TransmittedPower

867.1MHz 125kHz 1% 14dBm

867.3MHz 125kHz 1% 14dBm

867.5MHz 125kHz 1% 14dBm

867.7MHz 125kHz 1% 14dBm

867.9MHz 125kHz 1% 14dBm

868.1MHz 125kHz 1% 14dBm

868.3MHz 125kHz 1% 14dBm

868.5MHz 125kHz 1% 14dBm

Prof. Roberto Verdone www.robertoverdone.org

12km

10km

8km

6km

4km

2km

RX

LoRaWAN:Coverage

Prof. Roberto Verdone www.robertoverdone.org

Ø  CoverageofaLargeareao  Option1:1GW,retransmissionsmechanismtoincreaseSFand

transmissionrange

o  Option2:ManyGW

SF7SF10

CheapLowthroughputduetohighSF

MoreexpensiveHigherthroughputduetolowerSFanddiversity

LoRaWAN:Coverage

Prof. Roberto Verdone www.robertoverdone.org

LoRaWAN:Coverage

80

85

90

95

100

105

2000 20000 200000

SuccessR

ate[%

]

OfferedTraffic(O)[packet/day]

1GW 4GW

40timeshighercapacity4timesmoregateways