RSRP Mapping

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RSRP 3GPP Definition

RSRP or Reference Signal Received Power, is defined as the linear average over the power contributions (in [W]) of the resource elements (REs) that carry cell-specific reference signals within the considered measurement frequency bandwidth. For RSRP determination the cell-specific reference signals RE0 according TS 36.211 shall be used. If the UE can reliably detect that RE1 is available it may use RE1 in addition to R0 to determine RSRP.

In formula:
RSRP

where Prs,k is the estimated received power (in Watts) of the kth Reference Signal Resource Element (REs) transmitted from the first BTS antenna port.

In the figure beside, these REs are denoted with RE0. To improve the accuracy of the RSRP estimate, the UE may optionally also measure the RS transmitted from the second antenna port (RE1), if present.
In case of four BTS transmit antennas, Reference Signals of the third and fourth BTS antenna ports are not used in the RSRP measurement.
Since all LTE UEs have at least two receive antennas, RSRP must be equal or higher than the stronger of the two receive antennas’ individual measured RSRP.
The maximum number of PRBs over which RSRP should be measured is sent to the UE over RRC signalling, and is denoted in this paper with Nprb.

Applicable for: RRC_IDLE intra-frequency, RRC_IDLE inter-frequency, RRC_CONNECTED intra-frequency, RRC_CONNECTED inter-frequency

  • Note 1: 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
  • Note 2: The power per resource element is determined from the energy received during the useful part of the symbol, excluding the CP

In other words, RSRP is the average power of Resource Elements (RE) that carry cell specific Reference Signals (RS) over the entire bandwidth, so RSRP is only measured in the symbols carrying RS.

In other words:

  • RSRP is the average received power of a single RS resource element
  • UE measures the power of multiple resource elements used to transfer the reference signal but then takes an average of them rather than summing them
  • the reporting range of RSRP is defined from -140 dBm to – 44 dBm with 1 dB resolution. The mapping of measured quantity is defined in the table below: RSRP mapping 3GPP TS 36.133 V8.9.0 (2010-03)
  • RSRP does a better job of measuring signal power from a specific sector while potentially excluding noise and interference from other sectors
  • RSRP levels for usable signal typically range from about -75 dBm close in to an LTE cell site to -120 dBm at the edge of LTE coverage
  • the lowest RSRP value having reported value of ’RSRP_00’
  • under normal operating conditions, absolute measurement accuracy is allowed to have up to 6dB error for intra-frequency RSRP measurement
  • measured RSRP difference between serving and a neighbour cell on the same carrier frequency should have at most 3dB error.
  • for inter-frequency RSRP measurement, the absolute and relative error under normal conditions should both be less than 6dB. It can be seen that inter-frequency RSRP measurement is considerably less accurate for “power budget” type handover triggering than intra-frequency RSRP measurement.

 

The above cited measurement accuracy requirements hold for SNR = −6dB and without any higher layer measurement filtering. Higher SNR and application of L3 filtering results in improved measurement accuracy. Therefore, in typical network conditions, measurement error can be expected to be smaller.

 

RSRPFromToUnit
RSRP_00-140dB
RSRP_01-140-139dB
RSRP_02-139-138dB
RSRP_03-138-137dB
RSRP_04-137-136dB
RSRP_05-136-135dB
RSRP_06-135-134dB
RSRP_07-134-133dB
RSRP_08-133-132dB
RSRP_09-132-131dB
RSRP_10-131-130dB
RSRP_11-130-129dB
RSRP_12-129-128dB
RSRP_13-128-127dB
RSRP_14-127-126dB
RSRP_15-126-125dB
RSRP_16-125-124dB
RSRP_17-124-123dB
RSRP_18-123-122dB
RSRP_19-122-121dB
RSRP_20-121-120dB
RSRP_21-120-119dB
RSRP_22-119-118dB
RSRP_23-118-117dB
RSRP_24-117-116dB
RSRP_25-116-115dB
RSRP_26-115-114dB
RSRP_27-114-113dB
RSRP_28-113-112dB
RSRP_29-112-111dB
RSRP_30-111-110dB
RSRP_31-110-109dB
RSRP_32-109-108dB
RSRP_33-108-107dB
RSRP_34-107-106dB
RSRP_35-106-105dB
RSRP_36-105-104dB
RSRP_37-104-103dB
RSRP_38-103-102dB
RSRP_39-102-101dB
RSRP_40-101-100dB
RSRP_41-100-99dB
RSRP_42-99-98dB
RSRP_43-98-97dB
RSRP_44-97-96dB
RSRP_45-96-95dB
RSRP_46-95-94dB
RSRP_47-94-93dB
RSRP_48-93-92dB
RSRP_49-92-91dB
RSRP_50-91-90dB
RSRP_51-90-89dB
RSRP_52-89-88dB
RSRP_53-88-87dB
RSRP_54-87-86dB
RSRP_55-86-85dB
RSRP_56-85-84dB
RSRP_57-84-83dB
RSRP_58-83-82dB
RSRP_59-82-81dB
RSRP_60-81-80dB
RSRP_61-80-79dB
RSRP_62-79-78dB
RSRP_63-78-77dB
RSRP_64-77-76dB
RSRP_65-76-75dB
RSRP_66-75-74dB
RSRP_67-74-73dB
RSRP_68-73-72dB
RSRP_69-72-71dB
RSRP_70-71-70dB
RSRP_71-70-69dB
RSRP_72-69-68dB
RSRP_73-68-67dB
RSRP_74-67-66dB
RSRP_75-66-65dB
RSRP_76-65-64dB
RSRP_77-64-63dB
RSRP_78-63-62dB
RSRP_79-62-61dB
RSRP_80-61-60dB
RSRP_81-60-59dB
RSRP_82-59-58dB
RSRP_83-58-57dB
RSRP_84-57-56dB
RSRP_85-56-55dB
RSRP_86-55-54dB
RSRP_87-54-53dB
RSRP_88-53-52dB
RSRP_89-52-51dB
RSRP_90-51-50dB
RSRP_91-50-49dB
RSRP_92-49-48dB
RSRP_93-48-47dB
RSRP_94-47-46dB
RSRP_95-46-45dB
RSRP_96-45-44dB
RSRP_97-44

 

RSRP and RSRQ Measurement in LTE

 

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