Sounding reference signal carrier switching

An apparatus for wireless communication at a user equipment (UE), comprising:

• a memory;
• and
• at least one processor coupled to the memory and configured to:
• receive one or more sounding reference signal (SRS) transmission power control (TPC) configurations for Type A SRS carrier switching on one or more uplink carriers, wherein the one or more SRS TPC configurations comprise a mapping from one uplink carrier to one or more component carrier (CC) sets;
• receive, a downlink control information (DCI) comprising at least one of a request for SRS transmission on the one or more uplink carriers or one or more TPC commands for the SRS transmission on the one or more uplink carriers;
• and
• transmit, in response to the DCI, an SRS on the one or more uplink carriers based on a correspondence between the one or more TPC configurations and the one or more uplink carriers, wherein one of:
• a first number of the one or more SRS TPC configurations configured for the Type A SRS carrier switching inside at least one SRS carrier switching information element (IE) equals a second number of configured serving cells, and to transmit the SRS on the one or more uplink carriers, the at least one processor is further configured to apply each TPC command received in the DCI to a respective uplink carrier provided by a higher layer parameter such that an i-th SRS TPC configuration corresponds to an i-th configured serving cell for the UE,
• each TPC command applies to the respective uplink carrier provided by the higher layer parameter indicating a component carrier (CC) index in a CC set for the Type A SRS carrier switching, such that a third number of SRS TPC physical downlink control channel (PDCCH) configurations configured for the Type A SRS carrier switching inside an SRS carrier switching IE equals the second number of configured serving cells, and an i-th SRS-TPC-PDCCH-Configuration corresponds to the i-th configured serving cell,
• to transmit the SRS on the one or more uplink carriers, the at least one processor is further configured to apply a corresponding TPC command to an uplink carrier based on the correspondence between each SRS TPC configuration and each uplink carrier comprises relating the i-th SRS TPC configuration to the i-th configured serving cell when ranked in an increasing order of serving cell indexes,
• to transmit the SRS on the one or more uplink carriers, the at least one processor is further configured to apply the one or more TPC commands to the one or more uplink carriers based on a serving cell index and based on the correspondence between each of the one or more SRS TPC configurations and each of the one or more uplink carriers comprises relating the i-th SRS TPC configuration to a serving cell with the serving cell index “i”, or
• a subset of carriers are configured to receive a command for the SRS transmission or TPC command from a monitoring cell, and the correspondence between each SRS TPC configuration and each uplink carrier includes a relationship of the i-th SRS TPC configuration to an i-th uplink carrier of the subset of carriers when ranked in the increasing order of serving cell indexes.

A method of wireless communication at a user equipment (UE), comprising:

• receiving one or more sounding reference signal (SRS) transmission power control (TPC) configurations for one or more uplink carriers;
• receiving a monitoring cell configuration including a starting bit indication that indicates a starting bit of a first block of one or more blocks,
• receiving, from a monitoring cell, a downlink control information (DCI) comprising at least one of a request for SRS transmission on the one or more uplink carriers or one or more TPC commands for the SRS transmission on the one or more uplink carriers, wherein the one or more TPC commands are determined to apply to the one or more uplink carriers based on a mapping between a consecutive order of the one or more blocks and an order of a subset of cells configured to receive SRS information from the monitoring cell;
• and
• transmitting SRS on the one or more uplink carriers from the one or more uplink carriers based on a corresponding TPC command and corresponding starting bit information.

An apparatus for wireless communication at a user equipment (UE), comprising:

• a memory;
• and
• at least one processor coupled to the memory, wherein the memory and the at least one processor are configured to:
• receive one or more sounding reference signal (SRS) transmission power control (TPC) configurations for one or more uplink carriers;
• receive a monitoring cell configuration including a starting bit indication that indicates a starting bit of a first block of one or more blocks,
• receive, from a monitoring cell, a downlink control information (DCI) comprising at least one of a request for SRS transmission on the one or more uplink carriers or one or more TPC commands for the SRS transmission on the one or more uplink carriers, wherein the one or more TPC commands are determined to apply to the one or more uplink carriers based on a mapping between a consecutive order of the one or more blocks and an order of a subset of cells configured to receive SRS information from the monitoring cell;
• and
• transmit SRS on the one or more uplink carriers from the one or more uplink carriers based on a corresponding TPC command and corresponding starting bit information.