The SS-RSRP (Synchronization Signal-Reference Signal Received Power) signal is defined as the linear average of the power of all the contributions of the resources carried by the secondary synchronization signals (SS).
The overlap and "best server" results present the same functionality as described in UMTS and LTE technologies.
The result of RSSI (Received Signal Strength Indicator) is understood as the linear average of the total received power observed only in certain OFDM symbols of time resource measurements, in bandwidth measurements, over a number N of RB's coming from all sources (including thermal noise, adjacent channel interference, co-channel interference, etc.).
The result of the SS-RSRQ signal (Secondary Synchronization signal-Reference Signal Received Quality) is defined as the N x SS-RSRP / RSSI ratio, where N is the number of RBs in the bandwidth measurement of the RRSI carrier.
The result of SS-SINR (Secondary Synchronization signal-Signal to Interference-plus-Noise Ratio) is defined as the linear average of the power of all the contributions of the secondary synchronization signals resources divided by the linear mean of power of the contributions of the noise and interference resources carried by the secondary synchronization signals in the same bandwidth.
The SINR result for the downlink (SS-SINR DL) and uplink (SINR UL).
The theoretical maximum throughput result for the downlink and uplink, respectively.
3GPP TS 38.215: 5G NR; Physical layer measurements