In case of four BTS transmit antennas, Reference Signals of the third and fourth BTS antenna ports are not used in the RSRP measurement. 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 the figure beside, these REs are denoted with RE0. 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. If the UE can reliably detect that RE1 is available it may use RE1 in addition to R0 to determine RSRP. RSRP or Reference Signal Received Power, is defined as the linear average over the power contributions (in ) 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.
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