Timing advance group determination for supplementary uplink

An apparatus for wireless communication at a network device, comprising:

• a memory;
• and
• a processor coupled to the memory and configured to:
• receive a first uplink message using a first uplink carrier of a serving cell in accordance with a first timing advance value of a first timing advance group configured for a user equipment (UE);
• transmit a timing advance group configuration indicating a supplementary timing advance value for a supplementary uplink carrier of the serving cell, the timing advance group configuration indicating that the supplementary timing advance value is one of the first timing advance value of the first timing advance group or a second timing advance value of a second timing advance group for the supplementary uplink carrier;
• and
• receive a supplementary uplink message on the supplementary uplink carrier of the serving cell in accordance with the supplementary timing advance value based at least in part on the timing advance group configuration.

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

• communicating a first uplink message using a first uplink carrier of a serving cell in accordance with a first timing advance value of a first timing advance group associated with a first transmission configuration indicator state for the UE, and a second uplink message using a second uplink carrier of the serving cell in accordance with a second timing advance value of a second timing advance group associated with a second transmission configuration indicator state for the UE;
• receiving a timing advance group configuration indicating a supplementary timing advance value for a supplementary uplink carrier of the serving cell, the timing advance group configuration indicating that the supplementary timing advance value is one of the first timing advance value of the first timing advance group or the second timing advance value of the second timing advance group for the supplementary uplink carrier;
• and
• transmitting a supplementary uplink message using the supplementary uplink carrier of the serving cell in accordance with the supplementary timing advance value based at least in part on the timing advance group configuration for the UE.

A method for wireless communication at a network device, comprising:

• receiving a first uplink message using a first uplink carrier of a serving cell in accordance with a first timing advance value of a first timing advance group configured for a user equipment (UE);
• transmitting a timing advance group configuration indicating a supplementary timing advance value for a supplementary uplink carrier of the serving cell, the timing advance group configuration indicating that the supplementary timing advance value is one of the first timing advance value of the first timing advance group or a second timing advance value of a second timing advance group for the supplementary uplink carrier;
• and
• receiving a supplementary uplink message on the supplementary uplink carrier of the serving cell in accordance with the supplementary timing advance value based at least in part on the timing advance group configuration.