Method for performing hierarchical beamforming in wireless access system and device therefor

摘要

A method for performing hierarchical beamforming in a wireless access system and a device therefor are disclosed. Particularly, the method comprises: an initial step for allowing a base station to transmit a plurality of first beams, to which different steering vectors are applied, to a terminal through corresponding reference signals, and a repetition step for allowing the base station to transmit a plurality of second beams, to which different steering vectors are applied, to the terminal through corresponding reference signals by considering feedback information that contains an index of one or more beams received from the terminal, wherein the repetition step can be repeated up to a predetermined number of times.

主权项

1. A method for performing hierarchical beamforming in a wireless access system at a base station, the method comprising:
transmitting a plurality of first beams, to which different steering vectors are applied, to a user equipment through corresponding reference signals; receiving feedback information including indexes of one or more beams from the user equipment; and transmitting a plurality of second beams, to which different steering vectors are applied, to the user equipment through corresponding reference signals by considering the feedback information, wherein the one or more beams are determined by estimating the plurality of first beams at the user equipment, wherein a number of the second beams is more than a number of the one or more beams, wherein angles of the second beams are determined using the indexes of the one or more beams.