Sounding reference signal triggering for enhanced carrier aggregation

A method of wireless communication performed by a base station, comprising:

• identifying a carrier aggregation (CA) configuration and an aperiodic sounding reference signal (A-SRS) configuration of one or more user equipments (UEs), wherein the A-SRS configuration comprises one or more component carriers (CCs) on which the one or more UEs do not perform uplink (UL) data transmissions;
• transmitting a resource assignment on a downlink (DL) CC in the CA configuration, the resource assignment comprising a trigger for one or more UEs to transmit one or more A-SRS transmissions based at least in part on a downlink control information (DCI) format of the resource assignment, wherein one or more CCs of the A-SRS configuration for transmitting the one or more A-SRS transmissions are identified based at least in part on the DCI format of the resource assignment;
• and
• receiving A-SRS transmissions from the one or more UEs on CCs identified by the DCI format.

A mobile device for wireless communication, comprising:

• a processor;
• memory in electronic communication with the processor;
• and
• instructions stored in the memory and operable, when executed by the processor, to cause the mobile device to:
• identify a carrier aggregation (CA) configuration and an aperiodic sounding reference signal (A-SRS) configuration of the mobile device, wherein the A-SRS configuration comprises one or more component carriers (CCs) on which the mobile device does not perform uplink (UL) data transmissions;
• receive a resource assignment on a downlink (DL) CC in the CA configuration;
• detect a trigger for transmitting one or more A-SRS transmissions based at least in part on a downlink control information (DCI) format of the resource assignment;
• determine one or more CCs of the A-SRS configuration for transmitting the one or more A-SRS transmissions based at least in part on the DCI format of the resource assignment;
• and
• transmit the one or more A-SRS transmissions on the one or more determined CCs of the A-SRS configuration.

A network device for wireless, comprising:

• a processor;
• memory in electronic communication with the processor;
• and
• instructions stored in the memory and operable, when executed by the processor, to cause the network device to:
• identify a carrier aggregation (CA) configuration and an aperiodic sounding reference signal (A-SRS) configuration of one or more user equipments (UEs), wherein the A-SRS configuration comprises one or more component carriers (CCs) on which the one or more UEs do not perform uplink (UL) data transmissions;
• transmit a resource assignment on a downlink CC in the CA configuration, the resource assignment comprising a trigger for one or more UEs to transmit one or more A-SRS transmissions based at least in part on a downlink control information (DCI) format of the resource assignment, wherein one or more CCs of the A-SRS configuration for transmitting the one or more A-SRS transmissions are identified based at least in part on the DCI format of the resource assignment;
• and
• receive A-SRS transmissions from the one or more UEs on CCs identified by the DCI format.