Techniques for transmitting repetitions of random access messages in wireless communications

1. A method for wireless communication, comprising:

transmitting, to a base station, a first random access message in a two-step random access procedure, wherein the first random access message includes an indication to receive one or more repetitions of a second random access message from the base station;

receiving, from the base station and based on the indication, an initial transmission of the second random access message and the one or more repetitions of the second random access message;

combining the initial transmission of the second random access message and the one or more repetitions of the second random access message into a single message; and

decoding the single message.

2. The method of claim 1 , wherein the indication includes a random access preamble used in the first random access message.

3. The method of claim 1 , wherein the indication includes a format of the first random access message.

4. The method of claim 1 , further comprising determining to include the indication in the first random access message based at least in part on a received signal strength measurement of a synchronization signal block (SSB) from the base station.

5. The method of claim 1 , wherein the one or more repetitions of the second random access message are specific to a length of at least a portion of a random access response window.

6. The method of claim 1 , further comprising determining, from a configuration, the indication to use for receiving the one or more repetitions of the second random access message.

7. The method of claim 6 , further comprising receiving the configuration in remaining minimum system information (RMSI) signaled by the base station.

8. The method of claim 1 , further comprising determining one or more transmission parameters of the one or more repetitions of the second random access message to be the same as for the initial transmission of the second random access message.

9. The method of claim 8 , wherein the one or more transmission parameters include a modulation and coding scheme (MCS), one or more resource blocks (RBs), or a symbol index within a slot for the one or more repetitions of the second random access message.

10. The method of claim 1 , wherein the one or more repetitions of the second random access message are received over a different frequency than the initial transmission of the second random access message.

11. The method of claim 1 , wherein the second random access message includes a control channel and a data channel, and wherein the one or more repetitions of the second random access message comprises a first number of repetitions of the control channel and a second number of repetitions of the data channel.

12. A method for wireless communication, comprising:

receiving, from a device, a first random access message in a two-step random access procedure, wherein the first random access message includes an indication to receive one or more repetitions of a second random access message; and

transmitting, to the device and based on the indication, an initial transmission of the second random access message and the one or more repetitions of the second random access message,

wherein the second random access message includes a control channel and a data channel, and

wherein the one or more repetitions of the second random access message comprises a first number of repetitions of the control channel and a second number of repetitions of the data channel.

13. The method of claim 12 , wherein the indication includes a random access preamble used in the first random access message.

14. The method of claim 12 , wherein the indication includes a format of the first random access message.

15. The method of claim 12 , wherein the one or more repetitions of the second random access message are specific to a length of at least a portion of a random access response window.

16. The method of claim 12 , further comprising transmitting, to the device, a configuration specifying the indication to use for receiving the one or more repetitions of the second random access message.

17. The method of claim 16 , wherein transmitting the configuration comprises transmitting the configuration in remaining minimum system information (RMSI).

18. The method of claim 12 , further comprising determining one or more transmission parameters of the one or more repetitions of the second random access message to be the same as for the initial transmission of the second random access message.

19. The method of claim 18 , wherein the one or more transmission parameters include a modulation and coding scheme (MCS), one or more resource blocks (RBs), or a symbol index within a slot for the one or more repetitions of the second random access message.

20. The method of claim 12 , wherein transmitting the initial transmission and the one or more repetitions comprises transmitting the one or more repetitions of the second random access message over a different frequency than the initial transmission of the second random access message.

21. An apparatus for wireless communication, comprising:

a transceiver;

a memory configured to store instructions; and

one or more processors communicatively coupled with the memory and the transceiver, wherein the one or more processors are configured to:

transmit, to a base station, a first random access message in a two-step random access procedure, wherein the first random access message includes an indication to receive one or more repetitions of a second random access message from the base station;

receive, from the base station and based on the indication, an initial transmission of the second random access message and the one or more repetitions of the second random access message;

combine the initial transmission of the second random access message and the one or more repetitions of the second random access message into a single message; and

decode the single message.

22. The apparatus of claim 21 , wherein the indication includes a random access preamble used in the first random access message.

23. The apparatus of claim 21 , wherein the indication includes a format of the first random access message.

24. The apparatus of claim 21 , wherein the one or more processors are further configured to determine to include the indication in the first random access message based at least in part on a received signal strength measurement of a synchronization signal block (SSB) from the base station.

25. The apparatus of claim 21 , wherein the one or more repetitions of the second random access message are specific to a length of at least a portion of a random access response window.

26. The apparatus of claim 21 , wherein the one or more processors are further configured to determine, from a configuration, the indication to use for receiving the one or more repetitions of the second random access message.

27. An apparatus for wireless communication, comprising:

a transceiver;

a memory configured to store instructions; and

one or more processors communicatively coupled with the memory and the transceiver, wherein the one or more processors are configured to:

receive, from a device, a first random access message in a two-step random access procedure, wherein the first random access message includes an indication to receive one or more repetitions of a second random access message; and

transmit, to the device and based on the indication, an initial transmission of the second random access message and the one or more repetitions of the second random access message;

wherein the second random access message includes a control channel and a data channel, and

wherein the one or more repetitions of the second random access message comprises a first number of repetitions of the control channel and a second number of repetitions of the data channel.

28. The apparatus of claim 27 , wherein the indication includes a random access preamble used in the first random access message.