The RSRQ value can be used to measure the quality of the reference signal. RSRQ is calculated from the quotient of the received field strength of the reference signal, RSRP, and the field strength indicator, RSSI, in relation to all resource blocks of the bandwidth.
The RSRQ value is a dimensionless value expressed in decibels. Values of -3 dB represent extremely high quality, up to -10 dB there is only minor interference and performance loss, and at lower RSRQ values of -15 dB or -20 dB the quality is poor. Strong interfering influences are present, which result in not being able to make phone calls.