Dynamic slot aggregation indication for random access procedure

1. An apparatus for wireless communications at a user equipment (UE), comprising:

one or more processors;

one or more memories coupled with the one or more processors that store instructions that are operable, when executed by the one or more processors, to cause the apparatus to:

transmit, to a base station, a random access preamble to initiate a random access procedure;

receive, from the base station, a downlink message including:

a random access response (RAR) that includes a time domain resource allocation (TDRA) for a physical uplink channel, wherein a number of repetitions associated with transmitting the physical uplink channel is associated with a value of a transmission power control (TPC) command field; or

downlink control information (DCI) that includes a TDRA for retransmitting the physical uplink channel, wherein a number of repetitions associated with retransmitting the physical uplink channel is associated with one or both of a new data indicator field of the DCI or a hybrid automatic repeat request (HARQ) process number field of the DCI; and

transmit the physical uplink channel in accordance with the number of repetitions associated with transmitting the physical uplink channel or retransmit the physical uplink channel in accordance with the number of repetitions associated with retransmitting the physical uplink channel.

2. The apparatus of claim 1 , wherein the physical uplink channel is a message 3 transmission of the random access procedure that includes one or more of a connection request message, a scheduling request message, or a buffer status message.

3. The apparatus of claim 1 , wherein the physical uplink channel is a physical uplink shared channel (PUSCH).

4. The apparatus of claim 1 , wherein the DCI comprises format 0_0 with a cyclic redundancy check (CRC) scrambled by a temporary cell-radio network temporary identifier (TC-RNTI).

5. A method of wireless communication by a user equipment (UE), comprising:

transmitting, to a base station, a random access preamble to initiate a random access procedure;

receiving, from the base station, a downlink message including:

a random access response (RAR) that includes a time domain resource allocation (TDRA) for a physical uplink channel, wherein a number of repetitions associated with transmitting the physical uplink channel is associated with a value of a transmission power control (TPC) command field; or

downlink control information (DCI) that includes a TDRA for retransmitting the physical uplink channel, wherein a number of repetitions associated with retransmitting the physical uplink channel is associated with one or both of a new data indicator field of the DCI or a hybrid automatic repeat request (HARQ) process number field of the DCI; and

transmitting the physical uplink channel in accordance with the number of repetitions associated with transmitting the physical uplink channel or retransmitting the physical uplink channel in accordance with the number of repetitions associated with retransmitting the physical uplink channel.

6. The method of claim 5 , wherein the physical uplink channel is a message 3 transmission of the random access procedure that includes one or more of a connection request message, a scheduling request message, or a buffer status message.

7. The method of claim 5 , wherein the physical uplink channel is a physical uplink shared channel (PUSCH).

8. The method of claim 5 , wherein the DCI comprises format 0_0 with a cyclic redundancy check (CRC) scrambled by a temporary cell-radio network temporary identifier (TC-RNTI).

9. An apparatus for wireless communications at a base station, comprising:

one or more processors;

one or more memories coupled with the one or more processors that store instructions that are operable, when executed by the one or more processors, to cause the apparatus to:

receive, from a user equipment (UE), a random access preamble to initiate a random access procedure;

transmit, to the UE, a downlink message including:

a random access response (RAR) that includes a time domain resource allocation (TDRA) for a physical uplink channel, wherein a number of repetitions associated with transmitting the physical uplink channel is associated with a value of a transmission power control (TPC) command field; or

downlink control information (DCI) that includes a TDRA for retransmitting the physical uplink channel, wherein a number of repetitions associated with retransmitting the physical uplink channel is associated with one or both of a new data indicator field of the DCI or a hybrid automatic repeat request (HARQ) process number field of the DCI; and

receive transmissions of the physical uplink channel in accordance with the number of repetitions associated with transmitting the physical uplink channel or receive retransmissions of the physical uplink channel in accordance with the number of repetitions associated with retransmitting the physical uplink channel.

10. The apparatus of claim 9 , wherein the physical uplink channel is a message 3 transmission of the random access procedure that includes one or more of a connection request message, a scheduling request message, or a buffer status message.

11. The apparatus of claim 9 , wherein the physical uplink channel is a physical uplink shared channel (PUSCH).

12. The apparatus of claim 9 , wherein the DCI comprises format 0_0 with a cyclic redundancy check (CRC) scrambled by a temporary cell-radio network temporary identifier (TC-RNTI).

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

receiving, from a user equipment (UE), a random access preamble to initiate a random access procedure;

transmitting, to the UE, a downlink message including:

a random access response (RAR) that includes a time domain resource allocation (TDRA) for a physical uplink channel, wherein a number of repetitions associated with transmitting the physical uplink channel is associated with a value of a transmission power control (TPC) command field; or

downlink control information (DCI) that includes a TDRA for retransmitting the physical uplink channel, wherein a number of repetitions associated with retransmitting the physical uplink channel is associated with one or both of a new data indicator field of the DCI or a hybrid automatic repeat request (HARQ) process number field of the DCI; and

receiving transmissions of the physical uplink channel in accordance with the number of repetitions associated with transmitting the physical uplink channel or receiving retransmissions of the physical uplink channel in accordance with the number of repetitions associated with retransmitting the physical uplink channel.

14. The method of claim 13 , wherein the physical uplink channel is a message 3 transmission of the random access procedure that includes one or more of a connection request message, a scheduling request message, or a buffer status message.

15. The method of claim 13 , wherein the physical uplink channel is a physical uplink shared channel (PUSCH).

16. The method of claim 13 , wherein the DCI comprises format 0_0 with a cyclic redundancy check (CRC) scrambled by a temporary cell-radio network temporary identifier (TC-RNTI).