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
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Strict confidential
Figure 84 : Urban (small city) Hata propagation model – RSSI (dBm) vs distance (meters) vs height of the antenna
Figure 85 : Rural countryside Hata propagation model - RSSI (dBm) vs distance (meters) vs height of the antenna
What is noticeable is that the coverage distance at a fixed RSSI is doubled depending on the
height of the antenna.
3.2
Propagation model vs area type
Predicting the RSSI and more generally the coverage of the Wirnet iBTS depends on many
factors. The propagation channel must be well defined and known to have an efficient
prediction.
Radio coverage simulations are recommended before the installation of the Wirnet iBTS to
make sure the gateway would cover the expected area. Contact KERLINK for more
information.
In a first approach, the figures below show the RSSI of the signal (dBm) vs. the distance to
the end point (meters) vs. the type of area (urban, suburban, countryside, desert). The
height of the LoRa antenna is assumed to be 12 meters and 30 meters.
The propagation model used is based on Hata model.
The frequency is 868MHz in this case but performance and conclusions at 915MHz would be
almost identical. The RSSI is the received signal by the Wirnet iBTS. The end point EIRP is
assumed to be 25mW. The height of the end point is 1m.
