Wirnet iBTS
Document title : Installation and
Maintenance Manual
Version : 2.0
Author : SNI
Date : 04/12/2018
Classification
This document is the strict property of Kerlink and shall not be either copied nor sent without express
written authorization of Kerlink
Internal Use
Kerlink m2m technologies reserved rights
Confidential
Kerlink – 1 rue Jacqueline Auriol – 35235 THORIGNÉ-FOUILLARD
Page 66 / 221
Strict confidential
868
R-GSM900 UL (876-915MHz)
-75dBm/100KHz
868
LTE800 (832-862MHz)
-80dBm/100KHz
915
GSM850 DL (869-894MHz)
-85dBm/100KHz
915 FDx
GSM850 DL (869-894MHz)
-125dBm/100KHz
923
GSM900 UL(890-915MHz)
-85dBm/100KHz
923
GSM900 DL(935-960MHz)
-85dBm/100KHz
The performances detailed here are worst case i.e. when transmitting at maximum output
power at the edge of the band.
Out of band emissions in other LTE, UMTS or GSM bands are not detailed but are obviously
better.
The LORA-LOC module is therefore ideal in co-localization with BTS.
1.5.4.9
Sensitivity
The typical sensitivity performance, depending on the version, at 10% PER, 20 bytes payload
is the following:
Mode
868
915
915 FDx
923
SF7/125KHz
-128dBm
-127dBm
-127dBm
-128dBm
SF10/125KHz
-136dBm
-136dBm
-135dBm
-134dBm
SF12/125KHz
-141dBm
-141dBm
-140dBm
-140dBm
SF7/250KHz
-125dBm
-
-
-125dBm
SF12/250KHz
-138dBm
-
-
-135dBm
SF7/500KHz
-121dBm
-121dBm
-121dBm
-122dBm
SF12/500KHz
-135dBm
-134dBm
-134dBm
-134dBm
The sensitivity may vary over the frequency band and over temperature as follows:
Description
Specification
Sensitivity variation over the band
+/- 2dB
Sensitivity variation over temperature range (-20°C to +60°C)
+/- 1dB
1.5.4.10
RSSI and SNR
The Wirnet iBTS is able to receive LoRa frames from -20dBm to -141dBm, depending on the
LoRa BW and SF.
The Wirnet iBTS provides for each received frame, the RSSI and the SNR.
The RSSI is the “signal + noise” measurement of the received frame. Due to the wide
spreading modulation, the LoRa receiver is able to demodulate signals below the noise floor
i.e. with negative SNR.
