Adaptation of transmit and receive antennas
An antenna adaptation is provided for a communication node as controlled by an antenna adaptation command. The antenna adaptation command adjusts the number of active transmit antennas and/or the number of active receive antennas in the communication node such as for reducing interference at the communication node.
1. A method of wireless communication for a user equipment, comprising:
during a first antenna adaptation period, transmitting from the user equipment over a first number of transmit antennas according to a first data rate and receiving over a second number of receive antennas;
transitioning from the first antenna adaptation period to a second antenna adaptation period responsive to an antenna adaptation command to address interference to downlink reception at the user equipment, wherein the antenna adaptation command comprises at least one of a downlink control information (DCI) message, a media access control (MAC) control element (CE) message, and a radio resource control (RRC) message, and wherein the first antenna adaptation period and the second antenna adaptation period comprise one of a time slot, a portion of a time slot, a plurality of time slots, and a bandwidth part switching period; and
during the second antenna adaptation period, transmitting from the user equipment over a third number of transmit antennas according to a second data rate that is lower than the first data rate and receiving over a fourth number of receive antennas, wherein the first number of transmit antennas is greater than the third number of transmit antennas, and wherein the fourth number of receive antennas is greater than the second number of receive antennas.
2. The method of claim 1 , wherein the antenna adaptation command is based upon the DCI message, and wherein the DCI message comprises a plurality of DCI messages having a first DCI format in a first time instance and having a second DCI format in a second time instance, and wherein the antenna adaptation command comprises a first antenna adaptation command, the method further comprising:
determining the first antenna adaptation command based on the first DCI format in the first time instance; and
determining a second antenna adaptation command based on the second DCI format in the second time instance.
3. The method of claim 2 , wherein each DCI message in the plurality of DCI messages differs in at least one of a DCI decoding candidate and a DCI size.
4. The method of claim 2 , wherein the first antenna adaptation period is a first time slot and the second antenna adaptation period is a second time slot, and wherein the transmitting and receiving during the first time slot uses a transmit (T) and a receive (R) antenna configuration selected from a plurality of antenna configurations including a 1T2R configuration, a 1T4R configuration, a 2T4R configuration, a 4T4R configuration, a 1T8R configuration, a 2T8R configuration, a 4T8R configuration, and an 8T8R configuration.
5. A user equipment, comprising:
a set of transmit antennas;
a set of receive antennas;
a processor configured to process an antenna adaptation command to select a first number of transmit antennas from the set of transmit antennas and a second number of receive antennas from the set of receive antennas to address interference to downlink reception at the user equipment, wherein the antenna adaptation command comprises at least one of a downlink control information (DCI) message, a media access control (MAC) control element (CE) message, and a radio resource control (RRC) message; and
a transceiver configured to transmit at a first data rate through a second number of transmit antennas from the set of transmit antennas during a first antenna adaptation period and to receive over a third number of receive antennas from the set of receive antennas, the transceiver being further configured to transmit at a second data rate through the first number of transmit antennas during a second antenna adaptation period and to receive over the second number of receive antennas, wherein the first data rate is greater than the second data rate, the second number of receive antennas is larger than the third number of receive antennas, the first number of transmit antennas is less than the second number of transmit antennas, and the first antenna adaptation period and second antenna adaptation period each comprise one of a time slot, a portion of a time slot, a plurality of time slots, and a bandwidth part switching period.