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.
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