Method and a base station for controlling downlink transmission power, and a method and a user equipment for receiving a PDSCH

摘要

A ratio of data transmission power of a layer per RE to RS transmission power of the layer per RE is predefined according to rank. A BS determines downlink transmission power for a PDSCH according to the predefined rank and a UE assumes that the PDSCH and UE-specific RS(s) for the PDSCH is transmitted with power satisfying the ratio.

主权项

1. A method for transmitting, by a base station (BS), a downlink signal to a user equipment (UE) comprising:
allocating data transmission power for downlink data and reference signal (RS) transmission power for at least one UE-specific RS for the downlink data based on a ratio X/Y of data transmission power X to RS transmission power Y; and transmitting the downlink data and the at least one UE-specific RS according to the data transmission power X and the RS transmission power Y to the UE, wherein the data transmission power X is corresponding to power per layer a data resource element (RE) on which the downlink data is mapped, and the RS transmission power Y is corresponding to power per UE-specific RS in a RS RE on which the at least UE-specific RS is mapped, and wherein the ratio X/Y of data transmission power X to RS transmission power Y is predefined to be “1” in case that a number of layers used for transmission of the downlink data is less than or equal to two and predefined to be a specific value less than “1” in case that the number of layers is greater than two.