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For this, SNR or SINR would be more accurate.

You can get more absolute criteria for signal quality. However, you cannot get the absolute signal quality information from RSRQ only since the value would vary depending on Bandwidth and RB allocation. As you see in the RSRQ page, the maximum RSRQ value you can achieve is -3dB. The higher RSRQ is, the better the signal quality is if Bandwidth and number of RB allocation is same. Since 'N x RSRP' is always smaller than RSSI (total received power), the RSRQ is always negative value in dB. Considering RSSI is 'Signal + Noise' or 'Singal + Noise + Interference', you would novice that RSRQ is very similar to the definition of SNR or SINR which are the most common indicators of signal quality. Is there any parameter that can give you an idea of signal quality rather than the signal strength ? This is what RSRQ can give you. So high RSSI does not necessarily mean high signal power or good signal quality. The power in RSSI contains not only signal power (desired signal power) but also interference from other cells and any internal/external noise. As you see here or described in RSSI page, it is the total power integrated across the whole bandwidth, so the measured value can change and the number of RBs allocated to PDSCH. RSRP gives you an idea of the strength of the signal it gets from the network, but it is not clear indication of how good the signal quality is. So, this measurement would give you the lowest value comparing to other parameters. The value does not change with bandwidth or number of RBs currently assinged for PDSCH. As you see here or described in RSRP page, this is basically a power measurement for a single subcarrier. The most fundamental (basic) measurement is RSRP. Reading and understanding these equations and take a look at the plot shown above and see if you can understand any further than before you read this section. Now let me summarize several equations (formula) to show the correlations among these parameters. Example 3 > : RSRP/RSRQ/RSSI/SINR at driving/handover situation.