I have a question regarding the command to report RSRP. When I execute the command “AT+RSRP”, I receive the RSRP of the current service network. This RSRP value is measured by the UE (RMU500-EK) and also reported to the network. On the network side, I can also check the reported RSRP value from the UE using a communication tester that generates the network. This ensures I can read the RSRP value measured by the UE on both the UE side and the network side, and these values should be the same. However, I notice a discrepancy of 15 dBm between them.
I verified this with other UEs, and in those cases, the RSRP values reported on both the UE side and the network side are identical. Therefore, I believe I might be misinterpreting the value read from the UE.
According to the UE documentation, the RSRP value range should be between -140 and -44 dBm. Referring to 3GPP TS 38.133, the table for SS-RSRP and CSI-RSRP measurement report mapping shows L3-SS-RSRP (ranging from -156 to -31) and L1-SS-RSRP/CSI-RSRP (ranging from -140 to -44 dBm). The L1-SS-RSRP/CSI-RSRP defined in the 3GPP standard matches the values reported by the UE.
My question is: Which RSRP value do I read with the command “AT+RSRP”? At first glance, based on the standard and the UE documentation, I would assume it is L1 SS-RSRP/CSI-RSRP. However, considering my measurement results and comparison with other UEs, it seems that an adjustment of 15 dBm is necessary to align the values read from the UE with the correct results.