# How UE calculates the RSRP based on the reference signal received?

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Based on the reception of reference signal from eNB, how the UE calculates RSRP, RSRQ?

posted Jan 27, 2015
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## 1 Answer

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

RSRQ i.e. Reference Signal Received Quality is defined as the ratio N×RSRP/(E-UTRA carrier RSSI), where N is the number of RB’s of the E-UTRA carrier RSSI measurement bandwidth. The measurements in the numerator and denominator shall be made over the same set of resource blocks. The RSRQ measurement provides additional information when RSRP is not sufficient to make a reliable handover or cell reselection decision.

Formula

``````RSRP (dBm)= RSSI (dBm) -10*log (12*N) and
RSRQ = RSRP / (RSSI/N)

Where
N = Number of PRBs (Physical Resource Blocks)
RSSI = noise + serving cell power + interference power during RS symbol
``````
answer Jan 27, 2015
So UE measures RSRP from single resource element and do UE measures RSRP from RE that is on DC subcarrier or any RE in the entire band...
Dont know much about it, RSRP is measured over 1 resource element and RSSI per resource block measured over 12 resource elements.
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