The forma to calculate the signal strength depends on the technology,
and our ofono-rilmodem driver basically converts the ASU values to
percentage (0-31, 99).
Here's how android calculates the signal bars (for GSM):
"""
int asu = getGsmSignalStrength();
if (asu <= 2 || asu == 99) level = SIGNAL_STRENGTH_NONE_OR_UNKNOWN;
else if (asu >= 12) level = SIGNAL_STRENGTH_GREAT;
else if (asu >= 8) level = SIGNAL_STRENGTH_GOOD;
else if (asu >= 5) level = SIGNAL_STRENGTH_MODERATE;
else level = SIGNAL_STRENGTH_POOR;
if (DBG) log("getGsmLevel=" + level);
return level;
"""
So in order to have a similar result, here's the range and bars based on the
output from ofono (0-100%):
>= 38% - GREAT (4 bars)
25% <= x < 38% - GOOD (3 bars)
16% <= x < 25% - MODERATE (2 bars)
6% <= x < 16% - POOR (1 bar)
0% <= 6% - NONE or UNKNOWN
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https://bugs.launchpad.net/bugs/1329945
Title:
WWAN signal strength is reported lower than android in same location
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