Antenna switching for data transmission in a communication system using a plurality of transmission antennas

摘要

A closed-loop antenna switching method, a reference signal allocating method, and a feedback signal transmitting method for the same are disclosed. Namely, by transmitting a reference signal via the plurality of transmitting antennas via the antenna switching for reference signal transmission for each prescribed multiple period of an antenna selection period, efficient antenna index information can be fed back. By setting an antenna switching period to a prescribed multiple of an antenna selection period, it is able to prevent power loss and data decoding performance degradation. And, the present invention includes transmitting a sounding reference signal (SRS) for each band selection period via at least one of the plurality of transmitting antennas and transmitting at least one data demodulation reference signal (DMRS) between the band selection periods via an antenna for not transmitting data by reference signal transmission antenna switching.

主权项

1. A method of performing an antenna switching for data transmission by a transmission end in a communication system using a plurality of transmission antennas, the method comprising:
transmitting a first reference signal and a plurality of second reference signals via a transmission antenna transmitting data; transmitting at least one second reference signal among the plurality of second reference signals via at least one transmission antenna not transmitting data, by switching the transmission antenna when to transmit the at least one second reference signal, when a mobility of a user is larger than a prescribed threshold; receiving feedback signals in response to the transmitted first and second reference signals; and performing the antenna switching by selecting a transmission antenna for the data transmission among the plurality of transmission antennas based on the received feedback signals, wherein an interval of transmitting the at least one second reference signal is determined based on the mobility of the user, and wherein a number of reference signals within a transmission unit for the data transmission is equal to or greater than a number of the plurality of transmission antennas.