Method for controlling transmission power in a multi-antenna wireless communication system

摘要

The present invention relates to a wireless access system, and more particularly, to a method for controlling uplink transmission power in consideration of a transmission rank in a multi-antenna environment. A method for controlling the transmission power of an uplink data channel at a transmitting end which supports a plurality of transmission ranks according to one embodiment of the present invention, comprises the steps of: determining a first transmission power using at least one rank variable dependent on the transmission rank in a specific subframe; comparing the determined first transmission power with a second transmission power which is the preset maximum transmission power; and determining the value judged to be smaller than the result of the comparison to be the transmission power of the data channel.

主权项

1. A method for controlling a transmission power of an uplink data channel at a transmitting end that supports a plurality of transmission ranks, the method comprising the steps of:
determining a first transmission power using at least one rank variable dependent on the transmission rank in a specific subframe; comparing the determined first transmission power with a second transmission power which is the preset maximum transmission power; and determining the smaller value from the result of the comparison as the transmission power of the data channel, wherein the at least one rank variable includes a parameter (ΔTF) for power compensation through a modulation and coding scheme (MCS) for dynamic channel change and includes an offset value (ΔOFFSET) for power correction which is set per rank, wherein a power variable range of the offset value (ΔOFFSET) is smaller than a power variable range of the parameter (ΔTF), wherein the parameter (ΔTF) is determined by equations:ΔTF⁡(i)=10⁢log10⁡((2MPR·Ks-1)⁢βoffsetPUSCH)⁢⁢andMPR=∑k⁢⁢TBSk⁢NRE, wherein TBSk represents a size of a k-th transport block, NRE is a number of resource elements (REs), and Ks is a constant value which is experimentally determined, and wherein if control information is transmitted through a physical uplink shared channel (PUSCH) without uplink shared channel data, βoffsetPUSCH=βoffsetCQI, otherwise βoffsetPUSCH is set to 1.