WiFi signal strength and quality for Charge Amps Dawn with LTE-M connection
LTE-M connection is available for Charge Amps Dawn with integrated module LTE-M.
To work properly, the charging station Charge Amps Dawn with LTE-M needs to be installed within an area covered by Public Land Mobile Network (PLMN) with reliable signal strength and quality.
The first time the Charge Amps Dawn attaches to the PLMN, it will require some additional time (up to ten minutes) due to the LTE-M network attachment procedure.
After this, the Charge Amps Dawn will attach and connect to the network based on cached PLMN information.
Sufficient network signal strength rates
Tips for accessing the Field Test Mode
Before installing
1. Give the network a pre-test with a LTE-M Network analyzer app to measure the LTE-M signal strength. Try to find an app that measures Reference Signal Received Power (RSRP), Reference Signal Received Quality (RSRQ) and Signal to Interferance + Noice Ratio (SINR) values.
2. If you can’t find a good location for Charge Amps Dawn, you might need to use WiFi or LAN connectivity.
For WiFi in Charge Amps Dawn, the recommended RSSI or Received Signal Strength Indicator level should be better than -80 dBm and preferably better than -65 dBm.
Sufficient network signal strength rates
• RSRP – Reference Signal Received Power. Signal strength should be better than -100 dBm and preferably better than -90 dBm. The closer to -100 dBm, the poorer the quality, speed and reliability be.
RSRP (dBm) | Signal strength assessment | Description |
>= -80 | Excellent | Strong reference signal received from base station with good speed if quality is comparable. |
-80 to -90 | Good | Good reference signal received from base station with good speed if quality is comparable. |
-90 to -100 | Fair to poor | Fair to poor reference signal received from base station with fair or poor data speeds if quality is comparable. Assess if solution will be good enough for the use case. |
<= -100 | Very poor to disconnection | Do not use LTE-M solution and consider using Wi-Fi or LAN instead. |
• RSRQ – Reference Signal Received Quality. Signal quality should be better than -17 dB and preferably better than -15 dB. The closer to -17 dB, the poorer the quality, speed and reliability will be.
RSRQ (dB) | Signal quality assessment | Description |
>= -10 | Excellent | Excellent reference signal quality in received from base station with good speed if RSRP strength and SINR quality parameters are at comparable assessment level. |
-10 to -15 | Good | Good reference signal quality received from base station with good speed if RSRP strength and SINR quality parameters are at comparable assessment level. |
-15 to -17 | Fair to poor | Fair to poor reference signal received from base station with fair or poor data speeds if RSRP strength and SINR quality parameters are at comparable assessment level. Assess if solution will be good enough for the use case. |
<= -17 | Very poor to disconnection | Do not use LTE-M solution and consider using Wi-Fi or LAN instead. |
• SINR – Signal to Interference + Noise Ratio should be better than 3 dB and preferably better than13 dB. The closer to 3 dB, the poorer the quality, speed and reliability will be.
SINR (dB) | Signal quality assessment | Description |
>= 20 | Excellent | Excellent reference signal quality in received from base station with good speed if RSRP strength and RSRQ quality parameters are at comparable assessment level. |
13 to 20 | Good | Good reference signal quality received from base station with good speed if RSRP strength and RSRP quality parameters are at comparable assessment level. |
3 to 13 | Fair to poor | Fair to poor reference signal received from base station with fair or poor data speeds if RSRP strength and SINR quality parameters are at comparable assessment level. Assess if solution will be good enough for the use case. |
<= 3 | Very poor to disconnection | Do not use LTE-M solution and consider using Wi-Fi or LAN instead. |
N.B.: Mobile operator networks may change and interference and noise disturbance might be added over time. If the signal strength or quality parameters are close to the limit, the performance will drop drastically (3dB is equal to the double ratio or power level). Small differences in location and environment might impact the measurement results, e.g. radio signals are blocked by objects, reflecting of objects, or
objects disturbing the signal.
Make the measurement as close to the real installation as possible, e.g. with the garage door
closed.
Tips for accessing the Field Test Mode
Field Test or Diagnostic Mode on an iPhone or Android mobile phone is a diagnostic mode that provides detailed technical information about the device's cellular network and signal strength.
The Dawn LTE-M SIM card allows for roaming, why it is important to check which mobile operator Dawn has chosen. Dawn can also change mobile operator under certain circumstances. Using a SIM card in the mobile phone that also allows roaming.
iPhone
- Launch the Phone app on your iPhone. Dial *3001#12345#*. This will launch the hidden Field Test Mode.
- Check the Serving Cell Info (your phone might be locked to your SIM card operator network so you might not be able to see the network that the charger will choose).
Android
To test the Mobile network signal strength and quality for Charge Amps Dawn via Android mobile phone, our engineers tested via Network Cell Info Lite App, yet a range of other apps are also available as well.