METHOD AND APPARATUS FOR TRANSMISSION BY TIME DIVISION DUPLEXING (TDD) DEVICES USING MULTIPLE ANTENNAS

摘要

TDD devices may transmit using multiple antennas. First and second antennas having first and second receive conditions may receive a communication. In an aspect, first and second transmit conditions for the first and second antennas may be determined based on the first and second receive conditions. In an aspect, the first and second transmit conditions may be compared to select the first or second antenna for transmissions. In an aspect, the first and second receive conditions may be compared to select the first or second antenna for transmissions. In an aspect, first and second transmission conditioning values, which may determine transmission powers, may be determined based on the first and second receive conditions. A first transmission chain, associated with an active RAT or carrier, and a second transmission chain, associated with an inactive RAT or carrier, may be activated to send transmissions from the first and second antennas.

主权项

1. A method for transmission by a time division duplexing (TDD) device, comprising:
receiving a communication on a frequency at a first antenna having a first receive condition and a second antenna having a second receive condition; determining a first transmit condition for the first antenna based on the first receive condition and a second transmit condition for the second antenna based on the second receive condition; comparing the first transmit condition and the second transmit condition; selecting one of the first antenna and the second antenna based on the comparing; and sending a transmission on the frequency from the selected one of the first antenna and the second antenna.