The UE may determine that a transmission of an SRS in an uplink portion of CC2 would at least partially collide with an uplink transmission and/or reception of a downlink transmission on another CC. For example, the UE may determine that transmission of SRS 708 would collide with PUSCH/PDCCH 718 in FIG. 7A. In another example, the UE may determine that transmission of an SRS would collide with reception of a scheduled downlink transmission from an eNB. For example, if TDD carriers, CC1 and CC2, are configured in intra-band CA and each has a different UL/DL subframe configuration, then transmission of SRS on an unconfigured portion of CC1 could impair the ability to receive a downlink transmission on CC2. When the UE identifies the collision, the UE may determine to adjust at least one of the uplink transmission, the SRS transmission, or reception of the downlink transmission based on the determination of the collision and based on an interruption time to transmit the SRS in the unconfigured uplink portion of CC1.

The UE may apply a dropping rule, in which the UE determines to adjust the SRS transmission by dropping the SRS transmission when the SRS transmission could collide with a PUCCH transmission on another CC. The UE may then proceed with transmitting the PUCCH transmission without switching to transmit the SRS.

The UE may determine to refrain from receiving at least a portion of the downlink transmission when the UE determines that the SRS would collide at least partially with the downlink transmission. The UE may switch from a first CC on which it receives the downlink transmission to transmit the SRS on a second CC. The UE may switch back to the first CC to continue reception of the downlink transmission.