lorawan roberto verdone...prof. roberto verdone Ø coverage of a large area o option 1: 1 gw,...
TRANSCRIPT
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