A UE is located somewhere in the cell experiencing a path loss of 100 dB. Let’s consider a single atnenna system and say the Reference Signal Transmitted power is about 12 dBm. It sends a non-negative value ranging from 0 to 97 and each of these values are mapped to a specific range of real RSRP value defined in 3GPP 36.133 specifications and given in below Table. RSRP gives us the signal strength of the desired signal and UE usually measures RSRP based on the direction (RRC message) from the eNodeB and report the value. This measures only the reference power, we can say this is the strength of the wanted signal, but it does not gives any information about signal quality. R0 is the Cell Specific Reference Signal for Antenna Port 0 and R1 is the Cell Specific Reference signal for Antenna Port 1 If the UE can reliably detect that R1 is available it may use R1 in addition to R0 to determine RSRP. For RSRP determination the cell-specific reference signals R0 according TS 36.211 shall be used. Reference signal received power (RSRP), is defined as the linear average over the power contributions of the resource elements that carry cell-specific reference signals within the considered measurement frequency bandwidth. RRC_IDLE intra-frequency, RRC_IDLE inter-frequency, RRC_CONNECTED intra-frequency, RRC_CONNECTED inter-frequencyģGPP definition of RSRP in 36.214 specification is as : It is very similar to CPICH RSCP in WCDMA. It is applicable while UE in different RRC states i.e. This is the most important measurement UE has to do for cell selection, re-selection and handover. RSRP is the linear average of reference signal power (in Watts) measured over a specified bandwidth (in number of REs).
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