Sounding reference signals with collisions in asymmetric carrier aggregation

An apparatus for wireless communication, comprising:

• a memory;
• and
• at least one processor coupled to the memory and configured to:
• receive a carrier aggregation configuration for a first component carrier (CC) and a second CC, the first CC being a time division duplex (TDD) CC, the carrier aggregation configuration including downlink portions and excluding uplink portions of the first CC for data transmission by the UE;
• determine one of to transmit an uplink transmission on the second CC in a subframe or to receive a downlink transmission in the subframe on the second CC;
• determine that a sounding reference signal (SRS) transmission in an uplink portion of the first CC would at least partially collide in the subframe with one of the uplink transmission or the downlink transmission;
• determine to adjust at least one of the uplink transmission, the SRS transmission, or reception of the downlink transmission based on the determination of a collision and an interruption time to transmit the SRS in the uplink portion of the first CC;
• and
• perform at least one of transmitting the uplink transmission on the second CC, receiving the downlink transmission on the second CC, or transmitting the SRS in the uplink portion of the first CC based on the determination to adjust.

A method of wireless communication, comprising:

• transmitting a carrier aggregation configuration comprising a first component carrier (CC) and a second CC to a user equipment (UE), the first CC being a time division duplex (TDD) CC, the carrier aggregation configuration including downlink portions and excluding uplink portions of the first CC for data transmission by the UE;
• receiving an indication of a capability from the UE;
• and
• performing, at least one of:
• receiving an uplink transmission from the UE on a second CC, sending a downlink transmission to the UE on the second CC, or receiving a sounding reference signal (SRS) in the uplink portion of the first CC when the receiving or transmitting on the second CC collide with the SRS in a subframe.

An apparatus for wireless communication, comprising:

• a memory;
• and
• at least one processor coupled to the memory and configured to:
• transmit a carrier aggregation configuration comprising a first component carrier (CC) and a second CC to a user equipment (UE), the first CC being a time division duplex (TDD) CC, the carrier aggregation configuration including downlink portions and excluding uplink portions of the first CC for data transmission by the UE;
• receive an indication of a capability from the UE;
• and
• perform, at least one of:
• receiving an uplink transmission from the UE on a second CC, sending a downlink transmission to the UE on the second CC, or receiving a sounding reference signal (SRS) in the uplink portion of the first CC when the receiving or transmitting on the second CC collide with the SRS in a subframe.