The document discusses key performance indicators RSRP, RSRQ, and SINR used for measuring cellular network signal quality. It defines RSRQ as the ratio of RSRP to the total received power over a specific number of resource blocks, and SINR as the ratio of signal power to interference plus noise power over the resource blocks allocated to the user equipment. It also notes that without a reference signal power boost and with evenly distributed interference, RSRQ is equal to the inverse of SINR plus the resource block loading percentage, divided by 12.

1. RSRP、RSRQ、SINR
Reporter: Richard.Su

2. RSRQ = RSRP/(RSSI/N)
= RSRP*N/(IN_n + ρ*12*N*Psc)
SINR=S/(IN_m)
Where
N is # of PRBs(per cell resource blocks) for RSRQ
M is # of PRBs allocated to UE based on which SINR is measured
Psc is average Rx power per subcarrier. In case of no power boost for RS, Psc=RSRP.
IN_n is Interference plus noise over N PRBs used for RSRQ measurement
IN_m is Interference plus noise measured over M PRBs allocated to UE (for SINR).
In case that I+N is evenly distributed in all PRBs, then IN_n/N = IN_m/M.
ρ: loading (% of subcarriers transmitted) over N PRBs for RSRQ
S=Psc*M*12 is signal power.
Without RS power boost and with evenly distributed interference over all PRBs, we
have RSRQ = 1/[(1/SINR+ ρ)*12]

3. Relation between SINR and RSRQ