Reference signaling design and configuration

1. A method for wireless communication, comprising:

detecting, by a terminal, data to be transmitted via a group of cells;

transmitting, by the terminal, a first message initiating activation of the group of cells to a network node; and

mapping, by the terminal, the data to a data radio bearer (DRB),

wherein the DRB includes a bearer for the group of cells indicating that the DRB is mapped to the group of cells and includes a leg for the group of cells,

wherein the DRB includes a split bearer indicating that the DRB includes a master cell group (MCG) leg and a leg for the group of cells.

2. The method of claim 1 , further comprising:

receiving, by the terminal, a second message from the network node including an indication to activate the group of cells; and

activating, by the terminal, the group of cells as specified in the second message,

wherein activating the group of cells includes transitioning a serving cell of the group of cells from dormancy behavior to non-dormancy behavior, or

wherein activating the group of cells activates a serving cell of the group of cells from a deactivated state to an activated state.

3. The method of claim 1 , wherein the first message includes any of a radio resource control (RRC) message and a medium access control (MAC) control element (CE).

4. The method of claim 1 , wherein the network node includes a master node (MN).

5. The method of claim 1 , further comprising:

initiating, by the terminal, a physical random-access channel (PRACH) on a primary secondary cell (PSCell) of the group of cells; and

receiving, by the terminal, a response message from a secondary node (SN) that indicates a serving cell included in the group of cells to be transited from dormancy behavior to non-dormancy behavior, or activated from deactivated state.

6. The method of claim 1 , wherein the first message is indicative of a data buffer size and a logical channel group.

7. The method of claim 5 , wherein the initiating the PRACH on the PSCell of the group of cells is performed by sending a message directly to a secondary node (SN) and not via a master node (MN), wherein the message includes an identifier of the terminal, a data radio bearer identifier (DRB ID), and a data buffer size that indicates a total data volume available for transmission for a DRB indicated by the DRB ID.

8. A wireless communication apparatus, comprising:

a processor that is configured to perform a method, which causes the wireless communication apparatus to:

detect, by a terminal, data to be transmitted via a group of cells;

transmit, by the terminal, a first message initiating activation of the group of cells to a network node; and

map, by the terminal, the data to a data radio bearer (DRB),

wherein the DRB includes a bearer for the group of cells indicating that the DRB is mapped to the group of cells and includes a leg for the group of cells,

wherein the DRB includes a split bearer indicating that the DRB includes a master cell group (MCG) leg and a leg for the group of cells.

9. The wireless communication apparatus of claim 8 , wherein the processor is further configured to cause the wireless communication apparatus to:

receive, by the terminal, a second message from the network node including an indication to activate the group of cells; and

activate, by the terminal, the group of cells as specified in the second message,

wherein activating the group of cells includes transitioning a serving cell of the group of cells from dormancy behavior to non-dormancy behavior, or

wherein activating the group of cells activates a serving cell of the group of cells from a deactivated state to an activated state.

10. The wireless communication apparatus of claim 8 , wherein the first message includes any of a radio resource control (RRC) message and a medium access control (MAC) control element (CE).

11. The wireless communication apparatus of claim 8 , wherein the network node includes a master node (MN).

12. The wireless communication apparatus of claim 8 , wherein the processor is further configured to cause the wireless communication apparatus to:

initiate, by the terminal, a physical random-access channel (PRACH) on a primary secondary cell (PSCell) of the group of cells; and

receive, by the terminal, a response message from a secondary node (SN) that indicates a serving cell included in the group of cells to be transited from dormancy behavior to non-dormancy behavior, or activated from deactivated state.

13. The wireless communication apparatus of claim 12 , wherein the PRACH is initiated on the PSCell of the group of cells by the wireless communication apparatus that is configured by the processor to send a message directly to a secondary node (SN) and not via a master node (MN), wherein the message includes an identifier of the terminal, a data radio bearer identifier (DRB ID), and a data buffer size that indicates a total data volume available for transmission for a DRB indicated by the DRB ID.

14. The wireless communication apparatus of claim 8 , wherein the first message is indicative of a data buffer size and a logical channel group.

15. A non-transitory computer readable medium having code stored thereon, the code when executed by a processor, causing the processor to perform a method, comprising:

detecting, by a terminal, data to be transmitted via a group of cells;

transmitting, by the terminal, a first message initiating activation of the group of cells to a network node; and

mapping, by the terminal, the data to a data radio bearer (DRB),

wherein the DRB includes a bearer for the group of cells indicating that the DRB is mapped to the group of cells and includes a leg for the group of cells,

wherein the DRB includes a split bearer indicating that the DRB includes a master cell group (MCG) leg and a leg for the group of cells.

16. The non-transitory computer readable medium of claim 15 , wherein the method further comprises:

receiving, by the terminal, a second message from the network node including an indication to activate the group of cells; and

activating, by the terminal, the group of cells as specified in the second message,

wherein activating the group of cells includes transitioning a serving cell of the group of cells from dormancy behavior to non-dormancy behavior, or

wherein activating the group of cells activates a serving cell of the group of cells from a deactivated state to an activated state.

17. The non-transitory computer readable medium of claim 15 , wherein the first message includes any of a radio resource control (RRC) message and a medium access control (MAC) control element (CE).

18. The non-transitory computer readable medium of claim 15 , wherein the network node includes a master node (MN).

19. The non-transitory computer readable medium of claim 15 , wherein the method further comprises:

initiating, by the terminal, a physical random-access channel (PRACH) on a primary secondary cell (PSCell) of the group of cells; and

receiving, by the terminal, a response message from a secondary node (SN) that indicates a serving cell included in the group of cells to be transited from dormancy behavior to non-dormancy behavior, or activated from deactivated state.

20. The non-transitory computer readable medium of claim 19 , wherein the initiating the PRACH on the PSCell of the group of cells is performed by sending a message directly to a secondary node (SN) and not via a master node (MN), wherein the message includes an identifier of the terminal, a data radio bearer identifier (DRB ID), and a data buffer size that indicates a total data volume available for transmission for a DRB indicated by the DRB ID.