What is RSRP (Reference Signal Received Power ) in LTE? When RSRP is is applicable in LTE systems?
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.
For RSRP determination the cell-specific reference signals R0 shall be used. If the UE can reliably detect that R1 is available it may use R1 in addition to R0 to determine RSRP.
The reference point for the RSRP shall be the antenna connector of the UE. If receiver diversity is in use by the UE, the reported value shall not be lower than the corresponding RSRP of any of the individual diversity branches.
When is RSRP (Reference Signal Received Power) applicable?
RSRP is applicable in the following cases
- RRC_IDLE intra-frequency
- RRC_IDLE inter-frequency
- RRC_CONNECTED intra-frequency
- RRC_CONNECTED inter-frequency
The number of resource elements within the considered measurement frequency bandwidth and within the measurement period that are used by the UE to determine RSRP is left up to the UE implementation with the limitation that corresponding measurement accuracy requirements have to be fulfilled.
The power per resource element is determined from the energy received during the useful part of the symbol, excluding the CP.