Energy harvested end nodes and performance improvement of LoRa networks

Gupta, Gunjan; Van Zyl, Robert

doi:10.21307/ijssis-2021-002

Figures & Tables

Illustration of collision time for nodes as a function of their harvesting time, time on air and reception time.

Data extraction rate vs spreading factor (SF) for three different densities 10nodeskm2,20nodeskm2 and 500nodeskm2 square km.

The rate of increase of packet error as a function of increase in number of LoRa nodes for constant SF = 7.

The rate of increase of packet error as a function of increase in number of LoRa nodes for constant SF = 11.

The rate of increase of packet error as a function of increase in number of LoRa nodes and duty cycle for constant SF = 7.

Time on air (ms) as a function of payload (bytes) for different CR and constant SF = 7.

Time on air (ms) as a function of payload (bytes) for different CR and constant SF =12.

Comparison of energy efficiency of LoRa node versus distance between LoRa node and gateway for different SF.

Comparison of energy efficiency of LoRa node versus distance between LoRa node and gateway for SF = 9 and 10 with different transmission powers.

Algorithm PRIORLoRa

1. Input:

2. dtotal

– number of devices covered by a gateway

SFs,7⩽s⩽12

: denotes number of SF of value s,

SENS: denotes sensitivity of the devices,

RSSI – nodes power levels.

PRSSI – priority nodes power levels.

3. Output:

SFo

4. function PRIORLoRa-SF ([PRSSI]m×n,[SF]1×n)

.

5. [SF]1×n=[7…12]

of n

end devices.

6. for l = 1 to length (SF_s)

7. c=count(PRSSI(l)>SENS

)

8. ifc>dtotallength(SFs)

9. r=dtotallength(SFs)

10. else

11. r = c

12. End if

13. for k = 0 to r

14. [p,q]=max(PRSSI)

15.

16. PRSSI[:,q]=−200dBm

17. End for

18. End for

19. return SFo

.

Notations_

Notation	Definition
R_c	Chip rate
T_c	Chip duration
R_s	Symbol rate
T_s	Symbol duration
R_b	Data rate
SF	Spreading factor
CR	Coding rate
t_ai	Time on air of ith node

Energy harvested end nodes and performance improvement of LoRa networks

Figures & Tables

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Notations_

Paradigm

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