The RSRP is comparable to the CPICH RSCP measurement in WCDMA. This measurement of the signal strength of an LTE cell helps to rank between the different cells as input for handover and cell reselection decisions. The RSRP is the average of the power of all resource elements which carry cell-specific reference signals over the entire bandwidth. It can therefore only be measured in the OFDM symbols carrying reference symbols.
The RSRQ measurement provides additional information when RSRP is not sufficient to make a reliable handover or cell reselection decision. RSRQ is the ratio between the RSRP and the Received Signal Strength Indicator (RSSI), and depending on the measurement bandwidth, means the number of resource blocks. RSSI is the total received wideband power including all interference and thermal noise. As RSRQ combines signal strength as well as interference level, this measurement value provides additional help for mobility decisions.
RSSI = -79 dBm RSRP = -93 dBm
Using RSRQ = #ofRB in BW * (RSRP/RSSI) we have for 10 Mhz BW:
RSRQ = 10*log(50) + (-93+79) = 17 dB + -14 = 3dB
1. Parkland Wireless by Wei Xu
2. Wire Free Alliance posted by R Mahant