Method related to PUSCH repetitions, user equipment, and network device

1. A method related to Physical Uplink Shared Channel (PUSCH) repetitions, adapted for a user equipment (UE), the method comprising:

transmitting a Physical Random Access Channel (PRACH) preamble;

receiving a Random Access Response (RAR) message responding to the PRACH preamble, wherein the RAR message comprises an uplink grant that schedules a Message 3 (Msg3) PUSCH;

determining a Transport Block Size (TBS) for a Transport Block (TB) based on a first number of bits of a Modulation and Coding Scheme (MCS) field in the uplink grant;

selecting a number of PUSCH repetitions from a set of candidate numbers of PUSCH repetitions based on a second number of bits of the MCS field in the uplink grant; and

transmitting the Msg3 PUSCH for the TB with the number of PUSCH repetitions.

2. The method of claim 1 , wherein the MCS field in the uplink grant comprises a number of bits which is equal to a sum of the first number of bits and the second number of bits.

3. The method of claim 1 , further comprising:

receiving system information, wherein the system information indicates the set of candidate numbers of PUSCH repetitions.

4. The method of claim 1 , further comprising:

receiving system information; and

selecting the number of PUSCH repetitions from a predefined set of candidate numbers of PUSCH repetitions based on the MCS field in the uplink grant in response to the set of candidate numbers of PUSCH repetitions not comprised in the system information.

5. The method of claim 1 , further comprising:

receiving system information, wherein the system information comprises configuration of a set of predefined PRACH preambles used for requesting the Msg3 PUSCH with PUSCH repetitions.

6. The method of claim 5 , further comprising:

selecting the PRACH preamble from the set of predefined PRACH preambles used for requesting Msg3 PUSCH with PUSCH repetitions.

7. The method of claim 5 , further comprising:

selecting the PRACH preamble from the set of predefined PRACH preambles used for requesting Msg3 PUSCH with PUSCH repetitions in response to a Synchronization Signal Block (SSB) having a Reference Signal Received Power (RSRP) below a threshold.

8. The method of claim 3 , wherein the system information is system information block 1 (SIB1).

9. A user equipment (UE) comprising:

a transceiver, used for transmitting or receiving signals;

a memory, used for storing a program code; and

a processor, coupled to the transceiver and the memory, and configured to load and execute the program code to perform:

transmitting, through the transceiver, a Physical Random Access Channel (PRACH) preamble;

receiving, through the transceiver, a Random Access Response (RAR) message responding to the PRACH preamble, wherein the RAR message comprises an uplink grant that schedules a Message 3 (Msg3) PUSCH;

determining a Transport Block Size (TBS) for a Transport Block (TB) based on a first number of bits of a Modulation and Coding Scheme (MCS) field in the uplink grant;

selecting a number of PUSCH repetitions from a set of candidate numbers of PUSCH repetitions based on a second number of bits of the MCS field in the uplink grant; and

transmitting, through the transceiver, the Msg3 PUSCH for the TB with the number of PUSCH repetitions.

10. The UE of claim 9 , wherein the MCS field in the uplink grant comprises a number of bits which is equal to a sum of the first number of bits and the second number of bits.

11. The UE of claim 9 , wherein the processor is further configured for:

receiving, through the transceiver, system information, wherein the system information indicates the set of candidate numbers of PUSCH repetitions.

12. The UE of claim 9 , wherein the processor is further configured for:

receiving, through the transceiver, system information; and

selecting the number of PUSCH repetitions from a predefined set of candidate numbers of PUSCH repetitions based on the MCS field in the uplink grant in response to the set of candidate numbers of PUSCH repetitions not comprised in the system information.

13. The UE of claim 9 , wherein the processor is further configured for:

receiving, through the transceiver, system information, wherein the system information comprises configuration of a set of predefined PRACH preambles used for requesting the Msg3 PUSCH with PUSCH repetitions.

14. The UE of claim 13 , wherein the processor is further configured for:

selecting the PRACH preamble from the set of predefined PRACH preambles used for requesting Msg3 PUSCH with PUSCH repetitions.

15. The UE of claim 13 , wherein the processor is further configured for:

selecting the PRACH preamble from the set of predefined PRACH preambles used for requesting Msg3 PUSCH with PUSCH repetitions in response to a Synchronization Signal Block (SSB) having a Reference Signal Received Power (RSRP) below a threshold.

16. The UE of claim 11 , wherein the system information is system information block 1 (SIB1).

17. A method related to Physical Uplink Shared Channel (PUSCH) repetitions, adapted for a network device, the method comprising:

receiving a Physical Random Access Channel (PRACH) preamble;

transmitting a Random Access Response (RAR) message responding to the PRACH preamble, wherein the RAR message comprises an uplink grant that schedules a Message 3 (Msg3) PUSCH, and a Transport Block Size (TBS) for a Transport Block (TB) is indicated by a Modulation and Coding Scheme (MCS) field in the uplink grant; and

receiving the Msg3 PUSCH for the TB with a number of PUSCH repetitions, wherein

the number of PUSCH repetitions is one of a set of candidate numbers of PUSCH repetitions indicated by the MCS field in the uplink grant, a first number of bits of the MCS field in the uplink grant is used for indicating the TBS for the TB, and a second number of bits of the MCS field in the uplink grant is used for indicating the number of PUSCH repetitions from the set of candidate numbers of PUSCH repetitions.