RSRP and Relation between SINR and RSRQ

RSRP (Reference Signal Receive Power) is the average power of Resource Elements (RE) that carry cell specific Reference Signals (RS) over the entire bandwidth,

so RSRP is only measured in the symbols carrying RS. 

->RSRP is the average received power of a single RS resource element.

->UE measures the power of multiple resource elements used to transfer the reference signal but then takes an average of them rather than summing them.

-> Reporting range -44…-140dBm

SINR(Signal to Interface & Noise Ratio) is a measure of signal quality as well but it is not defined in the 3GPP spec but defined by UE vendor.

It is not reported to the network. SINR is used a lot by operators, and the LTE industry in general, as it better quantifies the relationship between RF conditions and Throughput. UEs typically use SINR to calculate the CQI (Channel Quality Indicator) they report to the network.

Relation between SINR and RSRQ

SINR= S/(I+N)

S= Indicate the power of measured usable signals. Reference signal(RS)+ Physical downlink shared channels(PDSCHs) are mainly involves.

I= Average interference power- power of measured signal or channel interference signal from other cell.

N= indicate background noise